JP2011065408A - Optical position detection device, calibration method of the same, and display device with position detection function - Google Patents

Optical position detection device, calibration method of the same, and display device with position detection function Download PDF

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JP2011065408A
JP2011065408A JP2009215379A JP2009215379A JP2011065408A JP 2011065408 A JP2011065408 A JP 2011065408A JP 2009215379 A JP2009215379 A JP 2009215379A JP 2009215379 A JP2009215379 A JP 2009215379A JP 2011065408 A JP2011065408 A JP 2011065408A
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position detection
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Setsunai Kiyose
摂内 清瀬
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Seiko Epson Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical position detection device which can calibrate light emission amounts of all of a plurality of position detection light sources even when position detection is carried out by utilizing intensity distribution of position detection light emitted from the plurality of position detection light sources, and to provide a calibration method of the optical position detection device, and a display device with a position detection function provided with the optical position detection device. <P>SOLUTION: The optical position detection device 10 calibrates the light emission amounts of the position detection light sources 12A-12D by detecting a position of a target object Ob by utilizing the intensity distribution of the position detection light formed in a detection region 10R. During the calibration, light emission parts 121 of the position detection light sources 12B, 12D face to a second direction Y2 opposite to a side where a photodetector 15 is positioned. So, calibration of the light emission amount with only the position detection light sources 12B, 12D lightened is carried out based on a detection result of light emitted from a first auxiliary light source 12V and a second auxiliary light source 12W. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、検出領域内の対象物体の位置を光学的に検出する光学式位置検出装置、光学式位置検出装置における校正方法、および光学式位置検出装置を備えた位置検出機能付き表示装置に関するものである。   The present invention relates to an optical position detection device that optically detects the position of a target object in a detection region, a calibration method in the optical position detection device, and a display device with a position detection function including the optical position detection device. It is.

携帯電話、カーナビゲーション、パーソナルコンピューター、券売機、銀行の端末などの電子機器では、近年、液晶装置などの画像生成装置の前面にタッチパネルが配置された位置検出機能付き表示装置が用いられ、かかる位置検出機能付き表示装置では、画像生成装置に表示された画像を参照しながら、情報の入力を行なう。このようなタッチパネルは、検出領域内において対象物体の位置を検出する位置検出装置として構成されている（例えば、特許文献１参照）。   In recent years, electronic devices such as mobile phones, car navigation systems, personal computers, ticket machines, and bank terminals have used display devices with a position detection function in which a touch panel is arranged on the front of an image generation device such as a liquid crystal device. The display device with a detection function inputs information while referring to an image displayed on the image generation device. Such a touch panel is configured as a position detection device that detects the position of a target object within a detection region (see, for example, Patent Document 1).

特許文献１に記載の位置検出装置は光学式であり、液晶パネルなどの直視型表示パネルに対して入力操作側に導光板を設け、導光板に対して入力操作側とは反対側に光源および受光素子などを配置する。そして、光源から出射された位置検出光を導光板を介して入力操作側に出射し、対象物体で反射した位置検出光を受光素子で受光する。   The position detection device described in Patent Document 1 is an optical type, and a light guide plate is provided on the input operation side with respect to a direct-view display panel such as a liquid crystal panel, and a light source and a light source on the opposite side of the light guide plate from the input operation side A light receiving element is arranged. Then, the position detection light emitted from the light source is emitted to the input operation side through the light guide plate, and the position detection light reflected by the target object is received by the light receiving element.

ＵＳＰａｔｅｎｔ Ｎｏ．６９２７３８４号公報US Patent No. No. 6927384

ここに、本願発明者は、特許文献１に記載の構造を応用して、図１４（ａ）、（ｂ）に模式的に示す光学式位置検出装置を提案するものである。かかる構成の光学式位置検出装置では、検出領域１０Ｒの面内方向に位置検出光の強度分布を順次逆向きで形成し、かかる検出領域１０Ｒにおいて対象物体Ｏｂにより反射した位置検出光を光検出器１５で検出する。例えば、位置検出用光源１２Ａから位置検出光Ｌ２ａを出射したときと、位置検出用光源１２Ｂから位置検出光Ｌ２ｂを出射したときでは、図１４（ｃ）に示すように、導光板１３から検出領域１０Ｒに出射された位置検出光の光強度分布が相違する。従って、位置検出光Ｌ２ａを出射したときと、位置検出光Ｌ２ｂを出射したときの光検出器１５での受光結果を比較すれば、矢印Ａで示す方向の対象物体Ｏｂの位置を検出することができる。また、位置検出用光源１２Ｃから位置検出光Ｌ２ｃを出射したときと、位置検出用光源１２Ｄから位置検出光Ｌ２ｄを出射したときの光検出器１５での受光結果を比較すれば、矢印Ｂで示す方向の対象物体Ｏｂの位置を検出することができる。   Here, the present inventor proposes an optical position detection apparatus schematically shown in FIGS. 14A and 14B by applying the structure described in Patent Document 1. FIG. In the optical position detection device having such a configuration, the intensity distribution of the position detection light is sequentially formed in the reverse direction in the in-plane direction of the detection region 10R, and the position detection light reflected by the target object Ob in the detection region 10R is detected by the photodetector. Detect at 15. For example, when the position detection light L2a is emitted from the position detection light source 12A and when the position detection light L2b is emitted from the position detection light source 12B, as shown in FIG. The light intensity distribution of the position detection light emitted to 10R is different. Therefore, by comparing the light reception results of the photodetector 15 when the position detection light L2a is emitted with the position detection light L2b, the position of the target object Ob in the direction indicated by the arrow A can be detected. it can. Further, when comparing the light reception result of the photodetector 15 when the position detection light L2c is emitted from the position detection light source 12C and when the position detection light L2d is emitted from the position detection light source 12D, it is indicated by an arrow B. The position of the target object Ob in the direction can be detected.

かかる光学式位置検出装置では、検出領域１０Ｒの面内方向に順次逆向きで形成した位置検出光の強度分布における絶対強度あるいは相対強度が一定であることが必要であるため、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正が行なわれる。かかる校正は、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ａ〜１２Ｄを順次点灯させ、その間の光検出器１５での受光結果を監視して行なう。   In such an optical position detection device, it is necessary that the absolute intensity or relative intensity in the intensity distribution of the position detection light sequentially formed in the reverse direction in the in-plane direction of the detection region 10R is constant, and therefore the position detection light source 12A. Calibration of the emitted light quantity of ˜12D is performed. Such calibration is performed by sequentially turning on the position detection light sources 12A to 12D in a state where the target object Ob does not exist and monitoring the light reception result of the photodetector 15 during that time.

しかしながら、図１４に示す構成において、位置検出用光源１２Ｂ、１２Ｄは発光部が光検出器１５が位置する側とは反体側に向いているため、対象物体Ｏｂが存在しない場合、位置検出用光源１２Ｂ、１２Ｄから出射された光が光検出器１５に一切入射しない。このため、位置検出用光源１２Ｂ、１２Ｄの出射強度の校正を行なえないという問題点がある。なお、図１４に示す形態は、本発明の参考例であって従来技術ではない。   However, in the configuration shown in FIG. 14, the position detection light sources 12B and 12D are directed to the opposite side to the side where the light detector 15 is located. Therefore, when the target object Ob does not exist, the position detection light source Light emitted from 12B and 12D does not enter the photodetector 15 at all. For this reason, there is a problem that the emission intensity of the position detection light sources 12B and 12D cannot be calibrated. The form shown in FIG. 14 is a reference example of the present invention and is not a conventional technique.

以上の問題点に鑑みて、本発明の課題は、複数の位置検出用光源から出射された位置検出光の強度分布を利用して位置検出を行なう場合でも、複数の位置検出用光源の全てに対して出射光量の校正を行なうことのできる光学式位置検出装置、光学式位置検出装置の校正方法、および光学式位置検出装置を備えた位置検出機能付き表示装置を提供することにある。   In view of the above problems, the problem of the present invention is that all of the plurality of position detection light sources are used even when position detection is performed using the intensity distribution of the position detection light emitted from the plurality of position detection light sources. An object of the present invention is to provide an optical position detection device that can calibrate the amount of emitted light, a method for calibrating the optical position detection device, and a display device with a position detection function that includes the optical position detection device.

上記課題を解決するために、本発明は、検出領域内の対象物体の位置を光学的に検出するための光学式位置検出装置であって、前記検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、前記検出領域に隣接する位置で当該検出領域に受光部を向ける光検出器と、前記対象物体で反射した前記位置検出光の前記光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、を有し、前記位置検出用光源装置は、前記検出領域に位置検出光を出射する複数の位置検出用光源と、前記光検出器の受光部に発光部を向けた補助光源と、該補助光源から出射された光の前記検出領域内への進入を阻止する遮光部と、を備えていることを特徴とする。   In order to solve the above-described problems, the present invention is an optical position detection device for optically detecting the position of a target object in a detection area, and the position detection light is emitted to the detection area and the detection is performed. A light source device for position detection that forms an intensity distribution of the position detection light in a region; a photodetector that directs a light receiving unit toward the detection region at a position adjacent to the detection region; and the position detection light reflected by the target object A position detector that detects a position of the target object based on a light reception result of the light detector, and the position detection light source device emits position detection light to the detection region. A light source for detection; an auxiliary light source having a light emitting portion directed toward the light receiving portion of the photodetector; and a light shielding portion that prevents light emitted from the auxiliary light source from entering the detection region. It is characterized by.

また、本発明は、検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、前記検出領域に隣接する位置で当該検出領域に受光部を向ける光検出器と、前記対象物体で反射した前記位置検出光の前記光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、を有する光学式位置検出装置の校正方法であって、前記位置検出用光源装置には、前記位置検出光を出射する複数の位置検出用光源と、前記光検出器の受光部に発光部を向けた補助光源と、該補助光源から出射された光の前記検出領域内への進入を阻止する遮光部と、を設けておき、前記複数の位置検出用光源のうちの少なくとも一部の位置検出用光源の出射光量の校正については、前記補助光源から出射された光の前記受光素子での検出結果に基づいて行なうことを特徴とする。   Further, the present invention provides a position detection light source device that emits position detection light to a detection region and forms an intensity distribution of the position detection light in the detection region, and receives light in the detection region at a position adjacent to the detection region. An optical position detection device comprising: a light detector that directs a light source; and a position detection unit that detects a position of the target object based on a light reception result of the position detection light reflected by the target object. The position detection light source device includes a plurality of position detection light sources that emit the position detection light, an auxiliary light source having a light emitting portion facing a light receiving portion of the photodetector, and the auxiliary light source device. A light-shielding unit that prevents light emitted from the light source from entering the detection region, and calibration of the emitted light amount of at least some of the plurality of position detection light sources. Is emitted from the auxiliary light source And performing on the basis of the detection result of the light receiving element of the light.

本発明では、検出領域に形成した位置検出光の強度分布を利用して対象物体の位置を検出することから、強度分布の絶対強度、あるいは順次形成した強度分布の相対強度が一定であることが必要である。このため、位置検出用光源の出射光量の校正を行なう。かかる校正は、例えば、検出領域内に対象物体が存在しない状態で位置検出用光源を順次点灯させ、その間の光検出器での受光結果に基づいて行なう。その際、少なくとも一部の位置検出用光源から放出された位置検出光が光検出器に入射しない場合でも、補助光源から出射された光が光検出器に入射するため、補助光源から出射された光の検出結果に基づいて出射光量の校正を行なうことができる。それ故、複数の位置検出用光源から出射された位置検出光の強度分布を利用して位置検出を行なう場合でも、複数の位置検出用光源の全てに対して出射光量の校正を行なうことができる。また、補助光源から出射された光に対しては、検出領域内への進入を阻止する遮光部が設けられているため、補助光源から出射された光によって位置検出が妨げられることがない。   In the present invention, since the position of the target object is detected using the intensity distribution of the position detection light formed in the detection region, the absolute intensity of the intensity distribution or the relative intensity of the sequentially formed intensity distribution may be constant. is necessary. For this reason, the amount of light emitted from the position detection light source is calibrated. Such calibration is performed, for example, based on the result of light reception by the photodetector during the time when the position detection light source is sequentially turned on in a state where the target object does not exist in the detection region. At that time, even if the position detection light emitted from at least a part of the position detection light source does not enter the photodetector, the light emitted from the auxiliary light source enters the photodetector, and thus is emitted from the auxiliary light source. The emitted light amount can be calibrated based on the light detection result. Therefore, even when position detection is performed using the intensity distribution of position detection light emitted from a plurality of position detection light sources, the amount of emitted light can be calibrated for all of the plurality of position detection light sources. . Further, since the light emitted from the auxiliary light source is provided with a light-shielding portion that prevents entry into the detection region, position detection is not hindered by the light emitted from the auxiliary light source.

本発明において、前記補助光源は、前記複数の位置検出用光源の少なくとも一部と同時に駆動される構成を採用することができる。かかる構成を採用した場合、位置検出時、補助光源からも光が出射されるが、かかる光は遮光部で遮られるため、位置検出に支障がない。   In the present invention, the auxiliary light source may be configured to be driven simultaneously with at least a part of the plurality of position detection light sources. When such a configuration is adopted, light is also emitted from the auxiliary light source at the time of position detection. However, since such light is blocked by the light shielding portion, there is no problem in position detection.

本発明において、前記光検出器の中心光軸の延在方向および該中心光軸に平行な仮想線の延在方向において前記光検出器が位置する側を第１方向とし、前記光検出器が位置する側とは反対側を第２方向としたとき、前記位置検出用光源装置は、前記位置検出用光源として、前記第１方向に発光部を向けて前記位置検出光を放出する第１位置検出用光源と、前記第２方向に発光部を向けて前記位置検出光を放出する第２位置検出用光源と、を備え、前記補助光源は、前記第２位置検出用光源と同時に駆動される構成を採用することができる。かかる構成によれば、第２位置検出用光源から放出された位置検出光は光検出器に入射しないが、補助光源から出射された光が光検出器に入射するため、補助光源から出射された光の検出結果に基づいて出射光量の校正を行なうことができる。   In the present invention, the side in which the photodetector is located in the extending direction of the central optical axis of the photodetector and the extending direction of the imaginary line parallel to the central optical axis is defined as a first direction, and the photodetector is When the opposite side to the side to be located is the second direction, the position detection light source device emits the position detection light as the position detection light source by directing a light-emitting portion in the first direction. A light source for detection and a second light source for position detection that emits the position detection light with the light emitting portion directed in the second direction, and the auxiliary light source is driven simultaneously with the second light source for position detection. A configuration can be employed. According to such a configuration, the position detection light emitted from the second position detection light source does not enter the photodetector, but the light emitted from the auxiliary light source enters the photodetector, and thus is emitted from the auxiliary light source. The emitted light amount can be calibrated based on the light detection result.

本発明において、前記第２位置検出用光源と前記補助光源とは、並列あるいは直列に電気的接続されていることが好ましい。かかる構成によれば、第２位置検出用光源と前記補助光源を連動した条件で駆動することができるので、補助光源から出射された光に基づいて第２位置検出用光源の出射光量の校正を行なっても、校正を正確に行なうことができる。   In the present invention, it is preferable that the second position detection light source and the auxiliary light source are electrically connected in parallel or in series. According to such a configuration, the second position detection light source and the auxiliary light source can be driven in an interlocked condition, so that the amount of light emitted from the second position detection light source is calibrated based on the light emitted from the auxiliary light source. Even if it is done, calibration can be performed accurately.

本発明において、前記検出領域は四角形の平面形状を備え、前記光検出器は、前記検出領域の第１辺部分に隣接する位置において当該第１辺部分に対向する第２辺部分に中心光軸を向けて配置され、前記第２位置検出用光源は、前記検出領域の前記第１辺部分の両側に位置する２つの第１角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、前記第１位置検出用光源は、前記第２辺部分の両側に位置する２つの第２角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、前記補助光源として、前記２つの第１角部分のうちの一方の第１角部分に相当する位置に設けられた前記第２位置検出用光源と同時に駆動される第１補助光源と、他方の第１角部分に相当する位置に設けられた前記第２位置検出用光源と同時に駆動される第２補助光源と、が設けられている構成を採用することができる。   In the present invention, the detection region has a rectangular planar shape, and the photodetector is arranged at a central optical axis at a second side portion facing the first side portion at a position adjacent to the first side portion of the detection region. The second position detection light source is arranged in a diagonal direction of the detection region at a position corresponding to two first corner portions located on both sides of the first side portion of the detection region. The first position detection light source is arranged with the light emitting portion facing the diagonal direction of the detection region at a position corresponding to two second corner portions located on both sides of the second side portion. A first auxiliary light source driven simultaneously with the second position detection light source provided at a position corresponding to one of the two first corner portions as the auxiliary light source, and the other The second position detection provided at a position corresponding to the first corner portion of A second auxiliary light source which is driven at the same time as use light sources, it is possible to adopt a configuration that is provided.

本発明において、前記位置検出用光源装置は、前記位置検出用光源から放出された前記位置検出光を内部に採り込んで光出射面から出射する導光板を備え、当該導光板の前記光出射面に平面視で重なる位置に前記検出領域が設けられている構成を採用することができる。   In the present invention, the light source device for position detection includes a light guide plate that takes in the position detection light emitted from the light source for position detection and emits the light from a light emission surface, and the light emission surface of the light guide plate It is possible to adopt a configuration in which the detection region is provided at a position overlapping with each other in plan view.

上記課題を解決するために、本発明の別の形態は、検出領域内の対象物体の位置を光学的に検出するための光学式位置検出装置であって、前記検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、前記検出領域に隣接する位置で当該検出領域に中心光軸を向ける第１光検出器と、前記対象物体で反射した前記位置検出光の前記第１光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、を有し、前記位置検出用光源装置は、前記位置検出光を放出する複数の位置検出用光源を備え、前記検出領域に隣接する位置には、前記第１光検出器の中心光軸に直交する方向、あるいは前記第１方向に中心光軸を向けた第２光検出器を備えていることを特徴とする。   In order to solve the above problems, another aspect of the present invention is an optical position detection device for optically detecting the position of a target object in a detection area, and emits position detection light to the detection area. A position detection light source device that forms an intensity distribution of the position detection light in the detection region, a first photodetector that directs a central optical axis toward the detection region at a position adjacent to the detection region, and the target object A position detection unit that detects a position of the target object based on a light reception result of the position detection light reflected by the first light detector, and the position detection light source device includes the position detection light. A plurality of position detection light sources that emit light, and a position adjacent to the detection region is a direction orthogonal to the center optical axis of the first photodetector or a center optical axis directed in the first direction. Two photo detectors are provided.

また、本発明は、検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、前記検出領域に隣接する位置で当該検出領域に受光部を向ける第１光検出器と、前記対象物体で反射した前記位置検出光の前記第１光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、を有する光学式位置検出装置の校正方法であって、前記検出領域に隣接する位置に、前記第１光検出器の中心光軸に直交する方向あるいは前記第１方向に中心光軸を向けた第２光検出器を設けておき、前記位置検出用光源装置に設けられた複数の位置検出用光源のうちの少なくとも一部の位置検出用光源の出射光量の校正については、前記第２光検出器での受光結果に基づいて行なうことを特徴とする。   Further, the present invention provides a position detection light source device that emits position detection light to a detection region and forms an intensity distribution of the position detection light in the detection region, and receives light in the detection region at a position adjacent to the detection region. And a position detection unit that detects the position of the target object based on a light reception result of the position detection light reflected by the target object at the first light detector. A calibration method for a position detecting device, wherein a second light detection is performed at a position adjacent to the detection region in a direction perpendicular to the central optical axis of the first photodetector or the central optical axis directed in the first direction. For the calibration of the emitted light quantity of at least some of the position detection light sources of the plurality of position detection light sources provided in the position detection light source device, the light reception by the second light detector is performed. Characterized by the results

本発明では、検出領域に形成した位置検出光の強度分布を利用して対象物体の位置を検出することから、強度分布の絶対強度、あるいは順次形成した強度分布の相対強度が一定であることが必要である。このため、位置検出用光源の出射光量の校正を行なう。かかる校正は、例えば、検出領域内に対象物体が存在しない状態で位置検出用光源を順次点灯させ、その間の第１光検出器での受光結果に基づいて行なう。その際、少なくとも一部の位置検出用光源から放出された位置検出光が第１光検出器に入射しない場合があるが、かかる光は、第２光検出器に入射する。このため、第２光検出器での受光結果に基づいて、出射光量の校正を行なうことができる。それ故、複数の位置検出用光源から出射された位置検出光の強度分布を利用して位置検出を行なう場合でも、複数の位置検出用光源の全てに対して出射光量の校正を行なうことができる。   In the present invention, since the position of the target object is detected using the intensity distribution of the position detection light formed in the detection region, the absolute intensity of the intensity distribution or the relative intensity of the sequentially formed intensity distribution may be constant. is necessary. For this reason, the amount of light emitted from the position detection light source is calibrated. Such calibration is performed, for example, based on the result of light reception by the first photodetector during the time when the position detection light source is sequentially turned on in a state where the target object does not exist in the detection region. At this time, the position detection light emitted from at least some of the position detection light sources may not enter the first photodetector, but such light enters the second photodetector. For this reason, the amount of emitted light can be calibrated based on the light reception result by the second photodetector. Therefore, even when position detection is performed using the intensity distribution of position detection light emitted from a plurality of position detection light sources, the amount of emitted light can be calibrated for all of the plurality of position detection light sources. .

本発明において、前記第１光検出器の中心光軸の延在方向および該中心光軸に平行な仮想線の延在方向において前記第１光検出器が位置する側を第１方向とし、前記第１光検出器が位置する側とは反対側を第２方向としたとき、前記位置検出用光源装置は、前記位置検出用光源として、前記第１方向に発光部を向けて前記位置検出光を放出する第１位置検出用光源と、前記第２方向に発光部を向けて前記位置検出光を放出する第２位置検出用光源と、を備えている構成を採用することができる。かかる構成によれば、第２位置検出用光源から放出された位置検出光は第１光検出器に入射しないが、第２光検出器に入射するため、第２位置検出用光源についても出射光量の校正を行なうことができる。   In the present invention, the side where the first photodetector is located in the extending direction of the central optical axis of the first photodetector and the extending direction of the imaginary line parallel to the central optical axis is defined as a first direction, When the second direction is the side opposite to the side on which the first photodetector is located, the position detection light source device serves as the position detection light source with the light emitting portion directed in the first direction. It is possible to adopt a configuration including a first position detection light source that emits light and a second position detection light source that emits the position detection light by directing a light emitting portion in the second direction. According to this configuration, the position detection light emitted from the second position detection light source does not enter the first light detector, but enters the second light detector. Can be calibrated.

本発明において、前記検出領域は四角形の平面形状を備え、前記第１光検出器は、前記検出領域の第１辺部分に隣接する位置において当該第１辺部分に対向する第２辺部分に中心光軸を向けて配置され、前記第２位置検出用光源は、前記検出領域の前記第１辺部分の両側に位置する２つの第１角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、前記第１位置検出用光源は、前記第２辺部分の両側に位置する２つの第２角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、前記第２光検出器は、前記検出領域の４つの辺部分のうち、前記第１辺部を除く３つの辺部分のいずれかに隣接する位置に配置されている構成を採用することができる。   In the present invention, the detection region has a quadrangular planar shape, and the first photodetector is centered on a second side portion facing the first side portion at a position adjacent to the first side portion of the detection region. The second position detection light source is disposed with the optical axis facing, and the light emitting unit is placed at a position corresponding to two first corner portions located on both sides of the first side portion of the detection region. The first position detection light source is arranged in an angular direction, and the light source is directed diagonally to the detection region at a position corresponding to two second corner portions located on both sides of the second side portion. The second photodetector is arranged at a position adjacent to any one of the three side portions excluding the first side portion among the four side portions of the detection region. be able to.

本発明において、前記位置検出用光源装置は、前記位置検出用光源から放出された前記位置検出光を内部に採り込んで光出射面から出射する導光板を備え、当該導光板の前記光出射面に平面視で重なる位置に前記検出領域が設けられている構成を採用することができる。   In the present invention, the light source device for position detection includes a light guide plate that takes in the position detection light emitted from the light source for position detection and emits the light from a light emission surface, and the light emission surface of the light guide plate It is possible to adopt a configuration in which the detection region is provided at a position overlapping with each other in plan view.

本発明を適用した光学式位置検出装置はいずれも、例えば、位置検出機能付き表示装置に用いられる。この場合、位置検出機能付き表示装置は、前記検出領域に対して平面的に重なる領域に画像を形成する画像生成装置を有することになる。   Any of the optical position detection devices to which the present invention is applied is used for a display device with a position detection function, for example. In this case, the display device with a position detection function includes an image generation device that forms an image in a region that overlaps the detection region in a planar manner.

本発明に係る位置検出機能付き表示装置は、投射型表示装置などの各種表示装置の他、携帯電話、カーナビゲーション、パーソナルコンピューター、券売機、銀行の端末などの電子機器に用いられる。   The display device with a position detection function according to the present invention is used in electronic devices such as a mobile phone, a car navigation system, a personal computer, a ticket machine, and a bank terminal, in addition to various display devices such as a projection display device.

本発明の実施の形態１に係る位置検出機能付き表示装置の構成を模式的に示す説明図である。It is explanatory drawing which shows typically the structure of the display apparatus with a position detection function which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る光学式位置検出装置の構成を示す説明図である。It is explanatory drawing which shows the structure of the optical position detection apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る光学式位置検出装置での位置検出方法を示す説明図である。It is explanatory drawing which shows the position detection method in the optical position detection apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る光学式位置検出装置での校正方法を示す説明図である。It is explanatory drawing which shows the calibration method in the optical position detection apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る位置検出機能付き表示装置の構成を模式的に示す説明図である。It is explanatory drawing which shows typically the structure of the display apparatus with a position detection function which concerns on Embodiment 2 of this invention. 本発明の実施の形態２に係る光学式位置検出装置の構成を示す説明図である。It is explanatory drawing which shows the structure of the optical position detection apparatus which concerns on Embodiment 2 of this invention. 本発明の実施の形態２に係る光学式位置検出装置での位置検出方法を示す説明図である。It is explanatory drawing which shows the position detection method in the optical position detection apparatus which concerns on Embodiment 2 of this invention. 本発明の実施の形態２に係る光学式位置検出装置での校正方法を示す説明図である。It is explanatory drawing which shows the calibration method in the optical position detection apparatus which concerns on Embodiment 2 of this invention. 本発明の変形例１に係る光学式位置検出装置および光学式位置検出装置の分解斜視図である。It is a disassembled perspective view of the optical position detection apparatus and optical position detection apparatus which concern on the modification 1 of this invention. 本発明の変形例１に係る光学式位置検出装置および光学式位置検出装置の断面構成を示す説明図である。It is explanatory drawing which shows the cross-sectional structure of the optical position detection apparatus which concerns on the modification 1 of this invention, and an optical position detection apparatus. 本発明の変形例２に係る光学式位置検出装置および光学式位置検出装置の分解斜視図である。It is a disassembled perspective view of the optical position detection apparatus and optical position detection apparatus which concern on the modification 2 of this invention. 本発明の変形例２に係る光学式位置検出装置および光学式位置検出装置の断面構成を示す説明図である。It is explanatory drawing which shows the cross-sectional structure of the optical position detection apparatus which concerns on the modification 2 of this invention, and an optical position detection apparatus. 本発明に係る位置検出機能付き表示装置を用いた電子機器の説明図である。It is explanatory drawing of the electronic device using the display apparatus with a position detection function which concerns on this invention. 本発明の参考例に係る光学式位置検出装置の説明図である。It is explanatory drawing of the optical position detection apparatus which concerns on the reference example of this invention.

次に、添付図面を参照して本発明の実施形態について詳細に説明する。なお、以下の説明においては、検出領域内における面内方向をＸＹＺ直交座標におけるＸＹ面とし、検出領域内における面内方向に直交する方向をＺ軸方向として説明する。   Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the in-plane direction in the detection area is described as the XY plane in the XYZ orthogonal coordinates, and the direction orthogonal to the in-plane direction in the detection area is described as the Z-axis direction.

［実施の形態１］
（位置検出機能付き表示装置の全体構成）
図１は、本発明の実施の形態１に係る位置検出機能付き表示装置の構成を模式的に示す説明図であり、図１（ａ）、（ｂ）は、位置検出機能付き表示装置の要部を斜め上からみた様子を模式的に示す説明図、および横方向からみた様子を模式的に示す説明図である。 [Embodiment 1]
(Overall configuration of display device with position detection function)
FIG. 1 is an explanatory view schematically showing a configuration of a display device with a position detection function according to Embodiment 1 of the present invention. FIGS. 1 (a) and 1 (b) are views of the display device with a position detection function. It is explanatory drawing which shows a mode that the part was seen from diagonally upward, and explanatory drawing which shows a mode that it looked at from the horizontal direction.

図１（ａ）、（ｂ）に示す位置検出機能付き表示装置１００は、光学式位置検出装置１０と画像生成装置２００とを備えており、光学式位置検出装置１０は、画像生成装置２００によって表示された画像に基づいて指などの対象物体を検出領域１０Ｒに接近させた際、対象物体Ｏｂの平面的な位置（Ｘ座標位置およびＹ座標位置）を検出する。   A display device with a position detection function 100 shown in FIGS. 1A and 1B includes an optical position detection device 10 and an image generation device 200, and the optical position detection device 10 is operated by the image generation device 200. When a target object such as a finger is brought close to the detection region 10R based on the displayed image, the planar position (X coordinate position and Y coordinate position) of the target object Ob is detected.

詳しくは後述するように、光学式位置検出装置１０は、赤外光からなる位置検出光を放出する複数の位置検出用光源１２を備えた位置検出用光源装置１１と、検出領域１０Ｒに受光部１５１を向けた光検出器１５とを有している。本形態において、位置検出用光源装置１１は、ＸＹ平面に平行に配置された導光板１３も備えている。光検出器１５は、フォトダイオードやフォトトランジスターなどの受光素子を備えている。   As will be described in detail later, the optical position detection device 10 includes a position detection light source device 11 including a plurality of position detection light sources 12 that emit position detection light composed of infrared light, and a light receiving unit in the detection region 10R. And a light detector 15 facing 151. In this embodiment, the position detection light source device 11 also includes a light guide plate 13 arranged in parallel to the XY plane. The photodetector 15 includes a light receiving element such as a photodiode or a phototransistor.

本形態において、画像生成装置２００は投射型であり、導光板１３の前面側（入力操作側）に重ねて配置されたスクリーン部材２２０と、スクリーン部材２２０の一方面２２０ｓ側に表示光を拡大投射する画像投射装置２５０とを有しており、画像生成装置２００は、スクリーン部材２２０上に画像表示領域２０Ｒを有している。かかるスクリーン部材２２０に対して画像投射装置２５０が位置する一方面２２０ｓ側には、光学式位置検出装置１０の検出領域１０Ｒが位置し、スクリーン部材２２０の他方面２２０ｔ側には、導光板１３および位置検出用光源１２を備えた位置検出用光源装置１１が配置されている。本形態において、画像表示領域２０Ｒは検出領域１０Ｒと略重なる領域である。   In this embodiment, the image generating apparatus 200 is a projection type, and the display light is enlarged and projected on the screen member 220 arranged to overlap the front surface side (input operation side) of the light guide plate 13 and the one surface 220s side of the screen member 220. The image generation device 200 has an image display area 20R on the screen member 220. The detection region 10R of the optical position detection device 10 is located on the one surface 220s side where the image projection device 250 is located with respect to the screen member 220, and the light guide plate 13 and the other surface 220t side of the screen member 220 are located. A position detection light source device 11 including a position detection light source 12 is arranged. In the present embodiment, the image display area 20R is an area that substantially overlaps the detection area 10R.

本形態において、スクリーン部材２２０としては、以下に説明する各種のものを用いることができるが、いずれの場合も、赤外光を通過可能な材質からなる。まず、スクリーン部材２２０としては、表面に白い塗料が塗ってある布地や、エンボス加工された白いビニール素材からなるホワイトスクリーンを用いることができる。また、スクリーン部材２２０としては、光の反射率を高めるために高銀色としたシルバースクリーンを用いることができる。さらに、スクリーン部材２２０としては、布地表面に樹脂加工を行なって光の反射率を高めたパールスクリーンや、表面に細かいガラス粉末が塗布して光の反射率を高めたピーススクリーンを用いることもできる。かかるスクリーン部材２２０は、吊下型の手動式の受光素子付きスクリーン、あるいは電動式の受光素子付きスクリーンとして構成される。   In this embodiment, as the screen member 220, various types of materials described below can be used. In any case, the screen member 220 is made of a material that can transmit infrared light. First, as the screen member 220, a cloth having a white paint on the surface or a white screen made of an embossed white vinyl material can be used. Further, as the screen member 220, a silver screen having a high silver color in order to increase the reflectance of light can be used. Furthermore, as the screen member 220, a pearl screen in which the resin surface is processed to increase the light reflectance or a piece screen in which fine glass powder is applied on the surface to increase the light reflectance can be used. . The screen member 220 is configured as a suspended manual screen with a light receiving element or an electric screen with a light receiving element.

なお、図１（ａ）、（ｂ）には、スクリーン部材２２０の正面に画像投射装置２５０が配置された例を示してあるが、画像投射装置２５０については、図１（ｂ）に一点鎖線で示すように、斜め方向からスクリーン部材２２０に向けて表示光を投射する場合もある。   1A and 1B show an example in which the image projection device 250 is arranged in front of the screen member 220. For the image projection device 250, a one-dot chain line in FIG. As shown, the display light may be projected toward the screen member 220 from an oblique direction.

（光学式位置検出装置１０の基本構成）
図２は、本発明の実施の形態１に係る光学式位置検出装置１０の構成を示す説明図であり、図２（ａ）、（ｂ）、（ｃ）は、光学式位置検出装置１０の断面構成を模式的に示す説明図、光学式位置検出装置に用いた導光板１３などの構成を示す説明図、および導光板１３内での位置検出用赤外光の減衰状態を示す説明図である。なお、図２では、Ｚ軸方向を上下方向として表してある。 (Basic configuration of the optical position detection device 10)
FIG. 2 is an explanatory diagram showing the configuration of the optical position detection device 10 according to the first embodiment of the present invention. FIGS. 2 (a), (b), and (c) are diagrams of the optical position detection device 10. FIG. 3 is an explanatory diagram schematically showing a cross-sectional configuration, an explanatory diagram showing a configuration of a light guide plate 13 and the like used in the optical position detection device, and an explanatory diagram showing an attenuation state of position detection infrared light in the light guide plate 13. is there. In FIG. 2, the Z-axis direction is represented as the up-down direction.

図２（ａ）、（ｂ）に示すように、本形態の光学式位置検出装置１０において、位置検出用光源装置１１は、長方形の平面形状を有する導光板１３を備えており、導光板１３の側端面１３ｍでは、長辺に相当する辺部分１３ｋ、１３ｌ同士がＹ軸方向で対向し、短辺に相当する辺部分１３ｉ、１３ｊ同士がＸ軸方向で対向している。また、光学式位置検出装置１０は、検出領域１０Ｒに受光部１５１を向けた光検出器１５を備えている。   As shown in FIGS. 2A and 2B, in the optical position detection device 10 of this embodiment, the position detection light source device 11 includes a light guide plate 13 having a rectangular planar shape. In the side end face 13m, the side portions 13k and 13l corresponding to the long sides face each other in the Y-axis direction, and the side portions 13i and 13j corresponding to the short sides face each other in the X-axis direction. In addition, the optical position detection device 10 includes a photodetector 15 having the light receiving unit 151 facing the detection region 10R.

位置検出用光源装置１１は、位置検出光Ｌ２ａ〜Ｌ２ｄを放出する４つの位置検出用光源１２Ａ〜１２Ｄ（図１に示す位置検出用光源１２）と、４つの位置検出用光源１２Ａ〜１２Ｄを各々独立して駆動する光源駆動回路４６０とを有している。   The position detection light source device 11 includes four position detection light sources 12A to 12D (position detection light source 12 shown in FIG. 1) that emit position detection lights L2a to L2d and four position detection light sources 12A to 12D. A light source driving circuit 460 that is driven independently.

本形態において、導光板１３の側端面１３ｍのうち、角部分１３ｅ、１３ｆ、１３ｇ、１３ｈには、位置検出用光源１２Ａ〜１２Ｄが配置されており、導光板１３の角部分１３ｅ、１３ｆ、１３ｇ、１３ｈにおいて位置検出用光源１２Ａ〜１２Ｄが対向する部分が光入射部１３ａ〜１３ｄになっている。ここで、位置検出用光源１２Ａ〜１２Ｄは、発光部１２１を導光板１３の対角方向に向けて配置されている。なお、位置検出用光源１２Ａ〜１２Ｄは光入射部１３ａ〜１３ｄと密接するように配置されていることが好ましい。   In this embodiment, among the side end surfaces 13m of the light guide plate 13, the corner portions 13e, 13f, 13g, and 13h are provided with position detection light sources 12A to 12D, and the corner portions 13e, 13f, and 13g of the light guide plate 13 are disposed. 13h, the portions where the position detection light sources 12A to 12D are opposed to each other are light incident portions 13a to 13d. Here, the position detection light sources 12 </ b> A to 12 </ b> D are arranged with the light emitting unit 121 facing the diagonal direction of the light guide plate 13. The position detection light sources 12A to 12D are preferably arranged so as to be in close contact with the light incident portions 13a to 13d.

導光板１３は、光入射部１３ａ〜１３ｄから入射した後、導光板１３内部を伝播した位置検出光Ｌ２ａ〜Ｌ２ｄを出射する光出射面１３ｓを一方の表面（図示上面）に備えており、かかる光出射面１３ｓと側端面１３ｍとは直交している。   The light guide plate 13 includes a light exit surface 13s that emits the position detection lights L2a to L2d propagated through the light guide plate 13 after entering from the light incident portions 13a to 13d on one surface (the upper surface in the drawing). The light emission surface 13s and the side end surface 13m are orthogonal to each other.

導光板１３は、ポリカーボネートやアクリル樹脂などの透明な樹脂板で構成されている。導光板１３において、光出射面１３ｓ、または光出射面１３ｓの反対側の背面１３ｔには、表面凹凸構造、プリズム構造、散乱層（図示せず）などが設けられており、このような光散乱構造によって、光入射部１３ａ〜１３ｄから入射して内部を伝播する光は、その伝播方向に進むに従って徐々に偏向されて光出射面１３ｓより出射される。なお、導光板１３の光出射側には、必要に応じて、位置検出光Ｌ２ａ〜Ｌ２ｄの均―化を図るために、プリズムシートや光散乱板などの光学シートが配置される場合もある。   The light guide plate 13 is made of a transparent resin plate such as polycarbonate or acrylic resin. In the light guide plate 13, the light output surface 13 s or the back surface 13 t opposite to the light output surface 13 s is provided with a surface uneven structure, a prism structure, a scattering layer (not shown), and the like. Depending on the structure, the light that is incident from the light incident portions 13a to 13d and propagates inside is gradually deflected and emitted from the light exit surface 13s as it travels in the propagation direction. In addition, an optical sheet such as a prism sheet or a light scattering plate may be disposed on the light emitting side of the light guide plate 13 for leveling the position detection lights L2a to L2d as necessary.

位置検出用光源１２Ａ〜１２Ｄは、例えばＬＥＤ（発光ダイオード）などの発光素子で構成され、駆動回路（図示せず）から出力される駆動信号に応じて、赤外光からなる位置検出光Ｌ２ａ〜Ｌ２ｄを発散光として放出する。位置検出光Ｌ２ａ〜Ｌ２ｄの種類は、特に限定されないが、可視光とは波長分布が異なるか、点滅などの変調が加えられることで発光態様が異なればよい。また、位置検出光Ｌ２ａ〜Ｌ２ｄは、指やタッチペンなどの対象物体Ｏｂにより効率的に反射される波長域を有することが好ましい。従って、対象物体Ｏｂが指などの人体であれば、人体の表面で反射率の高い赤外線（特に可視光領域に近い近赤外線、例えば波長で８５０ｎｍ付近）、あるいは９５０ｎｍであることが望ましい。   The position detection light sources 12 </ b> A to 12 </ b> D are configured by light emitting elements such as LEDs (light emitting diodes), for example, and position detection light L <b> 2 a that includes infrared light according to a drive signal output from a drive circuit (not shown). L2d is emitted as diverging light. The types of the position detection lights L2a to L2d are not particularly limited, but the wavelength distribution may be different from that of visible light, or the light emission mode may be different by adding modulation such as blinking. The position detection lights L2a to L2d preferably have a wavelength range that is efficiently reflected by the target object Ob such as a finger or a touch pen. Therefore, if the target object Ob is a human body such as a finger, it is desirable that the infrared ray has a high reflectance on the surface of the human body (in particular, a near infrared ray close to the visible light region, for example, near 850 nm in wavelength) or 950 nm.

位置検出用光源１２Ａ〜１２Ｄは本質的に複数設けられ、相互に異なる位置から位置検出光Ｌ２ａ〜Ｌ２ｄを放出するように構成される。４つの位置検出用光源１２Ａ〜１２Ｄのうち、対角位置の位置検出用光源が第１光源対を構成し、他の２つの位置検出用光源が第２光源対を構成している。また、４つの位置検出用光源１２Ａ〜１２Ｄのうち、隣り合う２つの位置検出用光源が第１光源対を構成し、他の２つの位置検出用光源が第２光源対を構成することもある。   The position detection light sources 12A to 12D are essentially provided in plural, and are configured to emit the position detection lights L2a to L2d from mutually different positions. Of the four position detection light sources 12A to 12D, the diagonal position detection light source constitutes a first light source pair, and the other two position detection light sources constitute a second light source pair. Of the four position detection light sources 12A to 12D, two adjacent position detection light sources may constitute a first light source pair, and the other two position detection light sources may constitute a second light source pair. .

検出領域１０Ｒは、位置検出光Ｌ２ａ〜Ｌ２ｄが視認側（操作側）に出射される領域であり、対象物体Ｏｂによる反射光が生じうる領域である。本形態において、検出領域１０Ｒの平面形状は、四角形状であり、Ｙ軸方向で対向する長辺としての辺部分１０ａ、１０ｂと、Ｘ軸方向で対向する短辺としての辺部分１０ｃ、１０ｄとを備えている。   The detection region 10R is a region where the position detection lights L2a to L2d are emitted to the viewing side (operation side), and is a region where reflected light from the target object Ob can be generated. In this embodiment, the planar shape of the detection region 10R is a quadrangular shape, and the side portions 10a and 10b as long sides facing in the Y-axis direction and the side portions 10c and 10d as short sides facing in the X-axis direction are It has.

検出領域１０Ｒの４つの辺部分１０ａ〜１０ｄのうち、１つの辺部分１０ｂ（第１辺部分）の長さ方向の略中央部分に隣接する箇所には光検出器１５が配置されている。光検出器１５は、検出領域１０Ｒに受光部１５１を向けており、その中心光軸Ｌ１５は、辺部分１０ａ（第２辺部分）および辺部分１０ｂに直交し、辺部分１０ｃ、１０ｄに平行である。光検出器１５には、位置検出部４５１を備えた集積回路４５０が接続されており、位置検出部４５１は、光検出器１５での検出結果に基づいて、対象物体Ｏｂの位置を検出する。   Among the four side portions 10a to 10d of the detection region 10R, the photodetector 15 is disposed at a location adjacent to the substantially central portion in the length direction of one side portion 10b (first side portion). The light detector 15 has the light receiving portion 151 facing the detection region 10R, and the center optical axis L15 is orthogonal to the side portion 10a (second side portion) and the side portion 10b and parallel to the side portions 10c and 10d. is there. An integrated circuit 450 including a position detector 451 is connected to the photodetector 15, and the position detector 451 detects the position of the target object Ob based on the detection result of the photodetector 15.

ここで、導光板１３と検出領域１０Ｒとは、長辺同士（辺部分１３ｋ、１０ａ同士、辺部分１３ｌ、１０ｂ同士）が同一の方向に位置し、短辺同士（辺部分１３ｉ、１０ｄ同士、辺部分１３ｊ、１０ｃ同士）が同一の方向に位置している。従って、導光板１３において、位置検出用光源１２Ｂ、１２Ｄが配置された角部分１３ｆ、１３ｈは、検出領域１０Ｒの辺部分１０ｂ（第１辺部分の両側に位置する２つの第１角部分）に相当する位置である。また、導光板１３において、位置検出用光源１２Ａ、１２Ｃが配置された角部分１３ｅ、１３ｇは、検出領域１０Ｒの辺部分１０ａ（第２辺部分の両側に位置する２つの第２角部分）に相当する位置である。   Here, the light guide plate 13 and the detection region 10R have long sides (side portions 13k, 10a, side portions 13l, 10b) located in the same direction, and short sides (side portions 13i, 10d, The side portions 13j and 10c) are located in the same direction. Accordingly, in the light guide plate 13, the corner portions 13f and 13h where the position detection light sources 12B and 12D are arranged are located on the side portions 10b of the detection region 10R (two first corner portions located on both sides of the first side portion). Corresponding position. In the light guide plate 13, the corner portions 13e and 13g where the position detection light sources 12A and 12C are arranged are located on the side portions 10a of the detection region 10R (two second corner portions located on both sides of the second side portion). Corresponding position.

このように構成した位置検出機能付き表示装置１００において、位置検出光Ｌ２ａと位置検出光Ｌ２ｂは、導光板１３の内部では、矢印Ａで示す方向において互いに逆向きに伝播しながら、光出射面１３ｓから出射される。また、位置検出光Ｌ２ｃと位置検出光Ｌ２ｄは、矢印Ａで示す方向に対して交差する方向（矢印Ｂで示す方向）において互いに逆向きに伝播しながら光出射面１３ｓから出射される。従って、導光板１３から検出領域１０Ｒに出射される位置検出光Ｌ２ａの光量は、図２（ｃ）に実線で示すように、位置検出用光源１２Ａからの距離に伴って直線的に減衰する強度分布を有することになる。また、検出領域１０Ｒに出射される位置検出光Ｌ２ｂの光量は、図２（ｃ）に点線で示すように、位置検出用光源１２Ｂからの距離に伴って直線的に減衰する強度分布を有することになる。   In the display device 100 with the position detection function configured as described above, the position detection light L2a and the position detection light L2b are propagated in the opposite directions in the direction indicated by the arrow A inside the light guide plate 13, and the light emission surface 13s. It is emitted from. In addition, the position detection light L2c and the position detection light L2d are emitted from the light emission surface 13s while propagating in directions opposite to each other in a direction intersecting the direction indicated by the arrow A (direction indicated by the arrow B). Therefore, the intensity of the position detection light L2a emitted from the light guide plate 13 to the detection region 10R is linearly attenuated with the distance from the position detection light source 12A, as indicated by a solid line in FIG. Will have a distribution. Further, the light amount of the position detection light L2b emitted to the detection region 10R has an intensity distribution that linearly attenuates with the distance from the position detection light source 12B, as indicated by a dotted line in FIG. become.

（ＸＹ座標を検出するための基本原理）
集積回路４５０に構成した位置検出部４５１において、光検出器１５での検出に基づいて対象物体ＯｂのＸＹ座標の取得方法について説明する。この位置情報の取得方法は種々のものが考えられるが、例えば、そのー例として、二つの位置検出光の検出光量の比率に基づいてそれらの減衰係数の比率を求め、この減衰係数の比率から両位置検出光の伝播距離を求めることにより、対応する二つの光源を結ぶ方向の位置座標を求める方法などが挙げられる。また、二つの位置検出光の検出光量の差を求め、この差から、対応する二つの光源を結ぶ方向の位置座標を求める方法が挙げられる。これらいずれの方法においても、光検出器１５からの出力値をそのまま演算に用いる方法、光検出器１５を介してキャパシタに蓄電あるいは放電させてキャパシタの端子間電圧が所定の電圧になるまでの時間を演算に用いる方法などを挙げることができる。いずれの場合も、以下に説明する性質を利用したものである。 (Basic principle for detecting XY coordinates)
A method for acquiring the XY coordinates of the target object Ob based on the detection by the photodetector 15 in the position detection unit 451 configured in the integrated circuit 450 will be described. There are various methods for acquiring the position information. For example, as an example, the ratio of the attenuation coefficient is obtained based on the ratio of the detected light amounts of the two position detection lights, and both are calculated from the ratio of the attenuation coefficient. For example, a method of obtaining position coordinates in a direction connecting two corresponding light sources by obtaining the propagation distance of the position detection light may be used. Further, there is a method in which the difference between the detected light amounts of the two position detection lights is obtained, and the position coordinates in the direction connecting the corresponding two light sources are obtained from this difference. In any of these methods, a method in which the output value from the photodetector 15 is used for calculation as it is, a time until the voltage between the terminals of the capacitor reaches a predetermined voltage after being stored or discharged in the capacitor via the photodetector 15. The method of using for calculation can be mentioned. In either case, the properties described below are used.

まず、位置検出機能付き表示装置１００においては、位置検出用光源１２Ａ〜１２Ｄから放出された位置検出光Ｌ２ａ〜Ｌ２ｄは各々、光入射部１３ａ〜１３ｄから導光板１３の内部に入射し、導光板１３の内部を伝播しながら徐々に光出射面１３ｓから出射される。その結果、位置検出光Ｌ２ａ〜Ｌ２ｄは、光出射面１３ｓから面状に放出される。   First, in the display device 100 with a position detection function, the position detection lights L2a to L2d emitted from the position detection light sources 12A to 12D are incident on the inside of the light guide plate 13 from the light incident portions 13a to 13d, respectively. The light is gradually emitted from the light exit surface 13 s while propagating through the inside of 13. As a result, the position detection lights L2a to L2d are emitted in a planar shape from the light emission surface 13s.

例えば、位置検出光Ｌ２ａは光入射部１３ａから光入射部１３ｂに向けて導光板１３の内部を伝播しながら徐々に光出射面１３ｓから放出されていく。同様に、位置検出光Ｌ２ｃ、Ｌ２ｄも導光板１３の内部を伝播しながら徐々に光出射面１３ｓから放出されていく。従って、検出領域１０Ｒに指などの対象物体Ｏｂが配置されると、対象物体Ｏｂにより上記位置検出光Ｌ２ａ〜Ｌ２ｄが反射され、その反射光の一部が上記光検出器１５により検出される。   For example, the position detection light L2a is gradually emitted from the light exit surface 13s while propagating through the inside of the light guide plate 13 from the light incident part 13a toward the light incident part 13b. Similarly, the position detection lights L2c and L2d are gradually emitted from the light exit surface 13s while propagating through the light guide plate 13. Therefore, when the target object Ob such as a finger is arranged in the detection region 10R, the position detection lights L2a to L2d are reflected by the target object Ob, and a part of the reflected light is detected by the photodetector 15.

ここで、検出領域１０Ｒに出射される位置検出光Ｌ２ａの光量は、図２（ｃ）に実線で示すように、位置検出用光源１２Ａからの距離に伴って直線的に減衰し、検出領域１０Ｒに出射される位置検出光Ｌ２ｂの光量は、図２（ｃ）に点線で示すように、位置検出用光源１２Ｂからの距離に伴って直線的に減衰すると考えられる。   Here, as indicated by a solid line in FIG. 2C, the light amount of the position detection light L2a emitted to the detection region 10R linearly attenuates with the distance from the position detection light source 12A, and the detection region 10R. It is considered that the amount of the position detection light L2b emitted to the line linearly attenuates with the distance from the position detection light source 12B, as indicated by a dotted line in FIG.

また、位置検出用光源１２Ａの制御量（例えば電流量）、変換係数、および放出光量をＩａ、ｋ、およびＥａとし、位置検出用光源１２Ｂの制御量（電流量）、変換係数、および放出光量をＩｂ、ｋ、およびＥｂとすれば、
Ｅａ＝ｋ・Ｉａ
Ｅｂ＝ｋ・Ｉｂ
となる。また、位置検出光Ｌ２ａの減衰係数、および検出光量をｆａ、およびＧａとし、位置検出光Ｌ２ｂの減衰係数、および検出光量をｆｂ、およびＧｂとすれば、
Ｇａ＝ｆａ・Ｅａ＝ｆａ・ｋ・Ｉａ
Ｇｂ＝ｆｂ・Ｅｂ＝ｆｂ・ｋ・Ｉｂ
となる。 Further, the control amount (current amount), conversion coefficient, and emission light amount of the position detection light source 12A are Ia, k, and Ea, and the control amount (current amount), conversion coefficient, and emission light amount of the position detection light source 12B. Is Ib, k, and Eb,
Ea = k · Ia
Eb = k · Ib
It becomes. Further, if the attenuation coefficient and detected light amount of the position detection light L2a are set to fa and Ga, and the attenuation coefficient and detected light amount of the position detection light L2b are set to fb and Gb,
Ga = fa · Ea = fa · k · Ia
Gb = fb · Eb = fb · k · Ib
It becomes.

従って、光検出器１５において両位置検出光の検出光量の比であるＧａ／Ｇｂが検出できるとすれば、
Ｇａ／Ｇｂ＝（ｆａ・Ｅａ）／（ｆｂ・Ｅｂ）＝（ｆａ／ｆｂ）・（Ｉａ／Ｉｂ）
となるから、放出光量の比Ｅａ／Ｅｂ、および制御量の比Ｉａ／Ｉｂに相当する値が分かれば、減衰係数の比ｆａ／ｆｂが分る。この減衰係数の比と両位置検出光の伝播距離の比との間に直線関係があれば、この直線関係を予め設定しておくことで、対象物体Ｏｂの位置情報を得ることができる。 Therefore, if the photodetector 15 can detect Ga / Gb, which is the ratio of the detected light amounts of both position detection lights,
Ga / Gb = (fa · Ea) / (fb · Eb) = (fa / fb) · (Ia / Ib)
Therefore, if the values corresponding to the emission quantity ratio Ea / Eb and the control quantity ratio Ia / Ib are known, the attenuation coefficient ratio fa / fb is known. If there is a linear relationship between the ratio of the attenuation coefficient and the ratio of the propagation distances of both position detection lights, the positional information of the target object Ob can be obtained by setting this linear relationship in advance.

上記減衰係数の比ｆａ／ｆｂを求める方法としては、例えば、位置検出用光源１２Ａと位置検出用光源１２Ｂを逆相で点滅（例えば、矩形波状若しくは正弦波状の駆動信号を伝播距離の差に起因する位相差が無視できる周波数で相互に１８０度の位相差を持つように動作）させた上で、検出光量の波形を解析する。より現実的には、例えば、一方の制御量Ｉａを固定し（Ｉａ＝Ｉｍ）、検出波形が観測できなくなるように、すなわち、検出光量の比Ｇａ／Ｇｂが１となるように他方の制御量ｌｂを制御し、このときの制御量Ｉｂ＝Ｉｍ・（ｆａ／ｆｂ）から上記減衰係数の比ｆａ／ｆｂを導出する。   As a method for obtaining the attenuation coefficient ratio fa / fb, for example, the position detection light source 12A and the position detection light source 12B blink in opposite phases (for example, a rectangular wave or sine wave drive signal is caused by a difference in propagation distance). The waveform of the detected light quantity is analyzed after the phase difference of 180 degrees is operated at a frequency at which the phase difference can be ignored. More realistically, for example, one control amount Ia is fixed (Ia = Im), and the other control amount is set so that the detected waveform cannot be observed, that is, the detected light quantity ratio Ga / Gb becomes 1. lb is controlled, and the ratio fa / fb of the attenuation coefficient is derived from the control amount Ib = Im · (fa / fb) at this time.

また、両制御量の和が常に一定、すなわち、下式
Ｉｍ＝Ｉａ＋Ｉｂ
を満たすように制御してもよい。この場合には、下式
Ｉｂ＝Ｉｍ・ｆｂ／（ｆａ十ｆｂ）
となるので、
ｆｂ／（ｆａ十ｆｂ）＝α
とすると、下式
ｆａ／ｆｂ＝（１−α）／α
により、減衰係数の比が求まる。 Further, the sum of both control amounts is always constant, that is, the following formula Im = Ia + Ib
You may control to satisfy | fill. In this case, the following formula Ib = Im · fb / (fa + fb)
So,
fb / (fa + fb) = α
Then, the following formula fa / fb = (1-α) / α
Thus, the ratio of the attenuation coefficient is obtained.

従って、対象物体Ｏｂの矢印Ａ方向の位置情報は、位置検出用光源１２Ａと位置検出用光源１２Ｂを相互に逆相で駆動することで取得することができる。また、対象物体Ｏｂの矢印Ｂ方向の位置情報は、位置検出用光源１２Ｃと位置検出用光源１２Ｄを相互に逆相で駆動することで取得することができる。それ故、制御系において上記Ａ方向とＢ方向の検出動作を順次行って対象物体ＯｂのＸＹ平面上の位置座標を取得できる。   Therefore, the position information of the target object Ob in the direction of arrow A can be obtained by driving the position detection light source 12A and the position detection light source 12B in opposite phases. Further, the position information of the target object Ob in the arrow B direction can be acquired by driving the position detection light source 12C and the position detection light source 12D in opposite phases. Therefore, the position coordinate of the target object Ob on the XY plane can be acquired by sequentially performing the detection operation in the A direction and the B direction in the control system.

上記のように、光検出器１５により検出される位置検出光の光量比に基づいて対象物体Ｏｂの検出領域１０Ｒ内の平面位置情報を取得するにあたって、例えば、マイクロプロセッサーユニット（ＭＰＵ）を用い、これにより所定のソフトウェア（動作プログラム）を実行することに従って処理を行う構成を採用することができる。また、論理回路などのハードウェアを用いた処理を利用することもできる。なお、集積回路４５０は、位置検出機能付き表示装置１００の一部として組み込まれていても良く、位置検出機能付き表示装置１００が搭載される電子機器の内部において構成されていてもよい。   As described above, for obtaining the plane position information in the detection area 10R of the target object Ob based on the light amount ratio of the position detection light detected by the photodetector 15, for example, using a microprocessor unit (MPU), Accordingly, it is possible to adopt a configuration in which processing is performed according to execution of predetermined software (operation program). Processing using hardware such as a logic circuit can also be used. Note that the integrated circuit 450 may be incorporated as a part of the display device with a position detection function 100, or may be configured inside an electronic apparatus in which the display device with a position detection function 100 is mounted.

（本形態の位置検出方法）
図３は、本発明の実施の形態１に係る光学式位置検出装置での位置検出方法を示す説明図であり、図３（ａ）、（ｂ）は各々、導光板１３（検出領域１０Ｒ）の長辺方向（Ｘ軸方向）の位置検出、および短辺方向（Ｙ軸方向）の位置検出を行なう場合の説明図である。 (Position detection method of this embodiment)
FIG. 3 is an explanatory diagram showing a position detection method in the optical position detection device according to the first embodiment of the present invention, and FIGS. 3A and 3B respectively show the light guide plate 13 (detection region 10R). It is explanatory drawing in the case of performing position detection of the long side direction (X-axis direction) and position detection of the short side direction (Y-axis direction).

本形態の光学式位置検出装置１０において、検出領域１０Ｒにおける対象物体ＯｂのＸ座標位置を検出するには、位置検出用光源装置１１において、光源駆動回路４６０は、図３（ａ）に示すように、位置検出用光源１２Ａ、１２Ｄを同相で駆動し、位置検出用光源１２Ｂ、１２Ｃを同相で駆動し、かつ、位置検出用光源１２Ａ、１２Ｄと位置検出用光源１２Ｂ、１２Ｃとを逆相で駆動する。すなわち、位置検出用光源１２Ａ、１２Ｄを点灯させ、位置検出用光源１２Ｂ、１２Ｃを消灯させてＸ軸方向の一方方向が高い強度分布を形成する第１期間と、位置検出用光源１２Ｂ、１２Ｃを点灯させ、位置検出用光源１２Ａ、１２Ｄを消灯させてＸ軸方向の他方方向の出射強度が高い強度分布を形成する第２期間とを交互に設定する。従って、位置検出部４５１において、第１期間と第２期間とにおける光検出器１５の検出値の比や差を用いれば、検出領域１０Ｒでの対象物体ＯｂのＸ座標を検出することができる。   In the optical position detection device 10 of the present embodiment, in order to detect the X coordinate position of the target object Ob in the detection region 10R, the light source drive circuit 460 in the position detection light source device 11 is as shown in FIG. In addition, the position detection light sources 12A and 12D are driven in the same phase, the position detection light sources 12B and 12C are driven in the same phase, and the position detection light sources 12A and 12D and the position detection light sources 12B and 12C are reversed in phase. To drive. That is, the position detection light sources 12A and 12D are turned on, the position detection light sources 12B and 12C are turned off, and a first intensity distribution in one direction in the X-axis direction is formed, and the position detection light sources 12B and 12C. The second period in which the light is turned on and the position detection light sources 12A and 12D are turned off to form an intensity distribution with a high emission intensity in the other direction in the X-axis direction is alternately set. Therefore, in the position detection unit 451, the X coordinate of the target object Ob in the detection region 10R can be detected by using the ratio or difference between the detection values of the photodetector 15 in the first period and the second period.

また、検出領域１０Ｒにおける対象物体ＯｂのＹ座標位置を検出するには、位置検出用光源装置１１において、光源駆動回路４６０は、図３（ｂ）に示すように、位置検出用光源１２Ａ、１２Ｃを同相で駆動し、位置検出用光源１２Ｂ、１２Ｄを同相で駆動し、かつ、位置検出用光源１２Ａ、１２Ｃと位置検出用光源１２Ｂ、１２Ｄとを逆相で駆動する。すなわち、位置検出用光源１２Ａ、１２Ｃを点灯させ、位置検出用光源１２Ｂ、１２Ｄを消灯させてＹ軸方向の一方方向が高い強度分布を形成する第１期間と、位置検出用光源１２Ｂ、１２Ｄを点灯させ、位置検出用光源１２Ａ、１２Ｃを消灯させてＹ軸方向の他方方向の出射強度が高い強度分布を形成する第２期間とを交互に設定する。従って、位置検出部４５０において、第１期間と第２期間とにおける光検出器１５の検出値の比や差を用いれば、検出領域１０Ｒでの対象物体ＯｂのＹ座標を検出することができる。   Further, in order to detect the Y-coordinate position of the target object Ob in the detection area 10R, the light source driving circuit 460 in the position detection light source device 11 includes the position detection light sources 12A and 12C as shown in FIG. Are driven in the same phase, the position detection light sources 12B and 12D are driven in the same phase, and the position detection light sources 12A and 12C and the position detection light sources 12B and 12D are driven in the opposite phase. That is, the position detection light sources 12A and 12C are turned on, the position detection light sources 12B and 12D are turned off, and a first intensity distribution in one direction in the Y-axis direction is formed, and the position detection light sources 12B and 12D The second period in which the light is turned on and the position detection light sources 12A and 12C are turned off to form an intensity distribution with a high emission intensity in the other direction in the Y-axis direction is alternately set. Therefore, the position detection unit 450 can detect the Y coordinate of the target object Ob in the detection region 10R by using the ratio or difference between the detection values of the photodetector 15 in the first period and the second period.

なお、４つの位置検出用光源１２Ａ〜１２Ｄを同時に点灯させてＺ軸方向に位置検出光の強度分布を形成し、Ｚ座標の検出を行なってもよい。   It is also possible to detect the Z coordinate by simultaneously turning on the four position detection light sources 12A to 12D to form an intensity distribution of the position detection light in the Z-axis direction.

（位置検出用光源の校正）
図４は、本発明の実施の形態１に係る光学式位置検出装置での校正方法を示す説明図である。 (Calibration of light source for position detection)
FIG. 4 is an explanatory diagram showing a calibration method in the optical position detection apparatus according to Embodiment 1 of the present invention.

本形態の光学式位置検出装置１０では、検出領域１０Ｒの面内方向に位置検出光の強度分布を順次逆向きで形成し、かかる検出領域１０Ｒにおいて対象物体Ｏｂにより反射した位置検出光を光検出器１５で検出する。従って、検出領域１０Ｒの面内方向に順次逆向きで形成した位置検出光では、強度分布の絶対強度あるいは相対強度が一定であることが必要である。このため、本形態では、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ａ〜１２Ｄを順次点灯させ、その間の光検出器１５での受光結果に基づいて、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正を行なう。また、本形態では、図２に示すように、集積回路４５０には、光検出器１５から受光結果が出力される光源校正部４５３が設けられており、光源校正部４５３は、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正に基づいて、位置検出の際に光源駆動回路４６０から位置検出用光源１２Ａ〜１２Ｄに供給される駆動電流の補正を行う。   In the optical position detection device 10 of the present embodiment, the intensity distribution of the position detection light is sequentially formed in the reverse direction in the in-plane direction of the detection region 10R, and the position detection light reflected by the target object Ob in the detection region 10R is detected. Detect with detector 15. Therefore, it is necessary that the absolute intensity or relative intensity of the intensity distribution is constant in the position detection light formed in the reverse direction in the in-plane direction of the detection region 10R. For this reason, in the present embodiment, the position detection light sources 12A to 12D are sequentially turned on in the absence of the target object Ob, and the position detection light sources 12A to 12D are emitted based on the light reception results of the light detector 15 during that time. Calibrate the light intensity. Further, in this embodiment, as shown in FIG. 2, the integrated circuit 450 is provided with a light source calibration unit 453 that outputs a light reception result from the photodetector 15, and the light source calibration unit 453 is a position detection light source. Based on the calibration of the emitted light amounts 12A to 12D, the drive current supplied from the light source drive circuit 460 to the position detection light sources 12A to 12D is corrected at the time of position detection.

ここで、光検出器１５の中心光軸Ｌ１５の延在方向、および中心光軸Ｌ１５に平行な仮想線の延在方向において、光検出器１５が位置する側を第１方向Ｙ１とし、光検出器１５が位置する側とは反対側を第２方向Ｙ２としたとき、位置検出用光源１２Ａ〜１２Ｄのうち、位置検出用光源１２Ａ、１２Ｃは、発光部１２１を第１方向Ｙ１に向けた第１位置検出用光源として構成されている。これに対して、位置検出用光源１２Ｂ、１２Ｄは、発光部１２１を第２方向Ｙ２に向けた第２位置検出用光源として構成されており、かかる位置検出用光源１２Ｂ、１２Ｄ（第２位置検出用光源）から出射された位置検出光Ｌ２ｂ、Ｌ２ｄは、対象物体Ｏｂが存在しない状態では光検出器１５に入射しない。   Here, in the extending direction of the central optical axis L15 of the photodetector 15 and the extending direction of the imaginary line parallel to the central optical axis L15, the side where the photodetector 15 is located is defined as the first direction Y1, and light detection is performed. Among the position detection light sources 12A to 12D, the position detection light sources 12A and 12C have the light emitting unit 121 in the first direction Y1 when the side opposite to the side where the device 15 is located is the second direction Y2. It is configured as a one-position detection light source. On the other hand, the position detection light sources 12B and 12D are configured as second position detection light sources with the light emitting unit 121 directed in the second direction Y2, and the position detection light sources 12B and 12D (second position detection). The position detection lights L2b and L2d emitted from the light source) do not enter the photodetector 15 in a state where the target object Ob does not exist.

そこで、本形態の光学式位置検出装置１０の位置検出用光源装置１１には、光検出器１５の受光部１５１に発光部１２１を向けた２つの補助光源（第１補助光源１２Ｖおよび第２補助光源１２Ｗ）が設けられている。第１補助光源１２Ｖおよび第２補助光源１２Ｗは、位置検出用光源１２Ａ〜１２Ｄと同一特性の発光ダイオードである。本形態において、第１補助光源１２Ｖは、導光板１３の辺部分１３ｌにおいて、光検出器１５と位置検出用光源１２Ｂとの間に配置され、発光部１２１を辺部分１３ｌに沿う方向に向けている。また、第２補助光源１２Ｗは、導光板１３の辺部分１３ｌにおいて、光検出器１５と位置検出用光源１２Ｄとの間に配置され、発光部１２１を辺部分１３ｌに沿う方向に向けている。   Therefore, the position detection light source device 11 of the optical position detection device 10 of the present embodiment includes two auxiliary light sources (first auxiliary light source 12V and second auxiliary light source) in which the light emitting unit 121 is directed to the light receiving unit 151 of the photodetector 15. A light source 12W) is provided. The first auxiliary light source 12V and the second auxiliary light source 12W are light emitting diodes having the same characteristics as the position detection light sources 12A to 12D. In this embodiment, the first auxiliary light source 12V is disposed between the photodetector 15 and the position detection light source 12B in the side portion 13l of the light guide plate 13, and the light emitting unit 121 is directed in the direction along the side portion 13l. Yes. The second auxiliary light source 12W is disposed between the photodetector 15 and the position detection light source 12D in the side portion 13l of the light guide plate 13, and directs the light emitting unit 121 in the direction along the side portion 13l.

ここで、第１補助光源１２Ｖは、位置検出用光源１２Ｂと同一のタイミングで同一の条件で光源駆動回路４６０によって駆動される。より具体的には、第１補助光源１２Ｖと位置検出用光源１２Ｂとは並列あるいは直列に電気的に接続されている。また、第２補助光源１２Ｗは、位置検出用光源１２Ｄと同一のタイミングで同一の条件で光源駆動回路４６０によって駆動される。より具体的には、第２補助光源１２Ｗと位置検出用光源１２Ｄとは並列あるいは直列に電気的に接続されている。   Here, the first auxiliary light source 12V is driven by the light source driving circuit 460 at the same timing as the position detection light source 12B under the same conditions. More specifically, the first auxiliary light source 12V and the position detection light source 12B are electrically connected in parallel or in series. The second auxiliary light source 12W is driven by the light source drive circuit 460 at the same timing as the position detection light source 12D under the same conditions. More specifically, the second auxiliary light source 12W and the position detection light source 12D are electrically connected in parallel or in series.

また、本形態の光学式位置検出装置１０の位置検出用光源装置１１では、第１補助光源１２Ｖから光検出器１５に向かう光路と、導光板１３の側端面１３ｍとの間に遮光部１９１が設けられており、第１補助光源１２Ｖから放出された光が検出領域１０Ｒに進入しないようになっている。また、第２補助光源１２Ｗから光検出器１５に向かう光路と、導光板１３の側端面１３ｍとの間にも遮光部１９２が設けられており、第２補助光源１２Ｗから放出された光が検出領域１０Ｒに進入しないようになっている。   Further, in the position detection light source device 11 of the optical position detection device 10 of the present embodiment, the light shielding portion 191 is provided between the optical path from the first auxiliary light source 12V to the light detector 15 and the side end surface 13m of the light guide plate 13. The light emitted from the first auxiliary light source 12V does not enter the detection region 10R. Further, a light-shielding portion 192 is also provided between the optical path from the second auxiliary light source 12W toward the photodetector 15 and the side end face 13m of the light guide plate 13, and the light emitted from the second auxiliary light source 12W is detected. It does not enter the region 10R.

このように構成した光学式位置検出装置１０において、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正を行なうには、まず、Ｘ軸方向における位置検出のための校正を行なう。より具体的には、図４（ａ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ｂ、１２Ｃを点灯させる一方、位置検出用光源１２Ａ、１２Ｄを消灯させて、矢印Ｘａで示す方向の強度分布を形成する。その際、第１補助光源１２Ｖも点灯する。次に、図４（ｂ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ａ、１２Ｄを点灯させる一方、位置検出用光源１２Ｂ、１２Ｃを消灯させて、矢印Ｘｂで示す方向の強度分布を形成する。その際、第２補助光源１２Ｗも点灯する。その間、光検出器１５での検出結果は、図２に示す集積回路４５０の光源校正部４５３に出力され、光源校正部４５３において校正が行なわれる。かかる校正の際、位置検出用光源１２Ｂ、１２Ｃから出射された位置検出光Ｌ２ｂ、Ｌ２ｃ、および位置検出用光源１２Ａ、１２Ｄから出射された位置検出光Ｌ２ａ、Ｌ２ｄは、その一部が光検出器１５に入射するので、第１補助光源１２Ｖおよび第２補助光源１２Ｗが存在するか否かにかかわらず、校正を行なうことができる。   In the optical position detection apparatus 10 configured as described above, in order to calibrate the emitted light quantity of the position detection light sources 12A to 12D, first, calibration for position detection in the X-axis direction is performed. More specifically, as shown in FIG. 4A, the position detection light sources 12B and 12C are turned on in the absence of the target object Ob, while the position detection light sources 12A and 12D are turned off, and the arrow Xa An intensity distribution in the direction indicated by is formed. At that time, the first auxiliary light source 12V is also turned on. Next, as shown in FIG. 4B, the position detection light sources 12A and 12D are turned on in the state where the target object Ob does not exist, while the position detection light sources 12B and 12C are turned off, and the direction indicated by the arrow Xb. Form an intensity distribution. At that time, the second auxiliary light source 12W is also turned on. Meanwhile, the detection result of the light detector 15 is output to the light source calibration unit 453 of the integrated circuit 450 shown in FIG. 2, and the light source calibration unit 453 performs calibration. During the calibration, part of the position detection lights L2b and L2c emitted from the position detection light sources 12B and 12C and the position detection lights L2a and L2d emitted from the position detection light sources 12A and 12D are partially photodetectors. Therefore, the calibration can be performed regardless of whether or not the first auxiliary light source 12V and the second auxiliary light source 12W exist.

これに対して、Ｙ軸方向における位置検出のための校正を行なう際には、以下に説明するように、第１補助光源１２Ｖおよび第２補助光源１２Ｗを用いる。Ｙ軸方向における位置検出のための校正を行なうには、まず、図４（ｃ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ｂ、１２Ｄを点灯させる一方、位置検出用光源１２Ａ、１２Ｃを消灯させて、矢印Ｙａで示す方向の強度分布を形成する。その際、第１補助光源１２Ｖおよび第２補助光源１２Ｗも点灯する。次に、図４（ｄ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ａ、１２Ｃを点灯させる一方、位置検出用光源１２Ｂ、１２Ｄを消灯させて、矢印Ｙｂで示す方向の強度分布を形成する。その際、第１補助光源１２Ｖおよび第２補助光源１２Ｗは消灯状態にある。その間、光検出器１５での検出結果は、図２に示す集積回路４５０の光源校正部４５３に出力され、光源校正部４５３において校正が行なわれる。   On the other hand, when performing calibration for position detection in the Y-axis direction, the first auxiliary light source 12V and the second auxiliary light source 12W are used as described below. To perform calibration for position detection in the Y-axis direction, first, as shown in FIG. 4C, the position detection light sources 12B and 12D are turned on in the absence of the target object Ob, while the position detection light source is turned on. The light sources 12A and 12C are turned off to form an intensity distribution in the direction indicated by the arrow Ya. At that time, the first auxiliary light source 12V and the second auxiliary light source 12W are also turned on. Next, as illustrated in FIG. 4D, the position detection light sources 12A and 12C are turned on in the absence of the target object Ob, while the position detection light sources 12B and 12D are turned off, and the direction indicated by the arrow Yb. Form an intensity distribution. At that time, the first auxiliary light source 12V and the second auxiliary light source 12W are in a light-off state. Meanwhile, the detection result of the light detector 15 is output to the light source calibration unit 453 of the integrated circuit 450 shown in FIG. 2, and the light source calibration unit 453 performs calibration.

かかる校正の際、図４（ｄ）に示す工程では、位置検出用光源１２Ａ、１２Ｃから出射された位置検出光Ｌ２ａ、Ｌ２ｃは、その一部が光検出器１５に入射する。これに対して、図４（ｃ）に示す工程では、位置検出用光源１２Ｂ、１２Ｄから出射された位置検出光Ｌ２ｂ、Ｌ２ｄは、光検出器１５に入射しない。しかるに本形態では、図４（ｃ）に示す工程では、第１補助光源１２Ｖおよび第２補助光源１２Ｗから出射された光が光検出器１５に入射する。また、第１補助光源１２Ｖおよび第２補助光源１２Ｗは、位置検出用光源１２Ａ、１２Ｄと同一特性の発光ダイオードであって、同一の条件で駆動される。従って、第１補助光源１２Ｖおよび第２補助光源１２Ｗから出射された光に基づいて、第２位置検出用光源（位置検出用光源１２Ｂ、１２Ｄ）の校正を行なえば、発光部１２１を第２方向Ｙ２（光検出器１５が位置する側とは反対側）に向けた第２位置検出用光源（位置検出用光源１２Ｂ、１２Ｄ）のみを点灯させた状態での出射光量の校正を行なったことになる。   At the time of such calibration, in the process shown in FIG. 4D, part of the position detection lights L2a and L2c emitted from the position detection light sources 12A and 12C enter the photodetector 15. On the other hand, in the step shown in FIG. 4C, the position detection lights L2b and L2d emitted from the position detection light sources 12B and 12D do not enter the photodetector 15. However, in this embodiment, in the step shown in FIG. 4C, light emitted from the first auxiliary light source 12V and the second auxiliary light source 12W enters the photodetector 15. The first auxiliary light source 12V and the second auxiliary light source 12W are light emitting diodes having the same characteristics as the position detection light sources 12A and 12D, and are driven under the same conditions. Accordingly, if the second position detection light source (position detection light sources 12B and 12D) is calibrated based on the light emitted from the first auxiliary light source 12V and the second auxiliary light source 12W, the light emitting unit 121 is moved in the second direction. The calibration of the amount of emitted light with only the second position detection light source (position detection light sources 12B and 12D) directed to Y2 (the side opposite to the side where the photodetector 15 is located) lit. Become.

かかる校正を行なった後、光源校正部４５３は、図４（ａ）に矢印Ｘａで示す方向の強度分布と、図４（ｂ）に矢印Ｘｂで示す方向の強度分布とが等しく、かつ、図４（ｃ）に矢印Ｙａで示す方向の強度分布と、図４（ｄ）に矢印Ｙｂで示す方向の強度分布とが等しくなるように、位置検出の際に光源駆動回路４６０から位置検出用光源１２Ａ〜１２Ｄに供給される駆動電流の補正を行う。かかる校正は、光学式位置検出装置１０を製造した際に行なわれる。また、上記の校正は、光学式位置検出装置１０が出荷された後、実使用の際、例えば、電源供給が実施される度に行われる。   After performing the calibration, the light source calibration unit 453 has the same intensity distribution in the direction indicated by the arrow Xa in FIG. 4A and the intensity distribution in the direction indicated by the arrow Xb in FIG. The position detection light source from the light source driving circuit 460 at the time of position detection so that the intensity distribution in the direction indicated by the arrow Ya in FIG. 4C and the intensity distribution in the direction indicated by the arrow Yb in FIG. The drive current supplied to 12A to 12D is corrected. Such calibration is performed when the optical position detection apparatus 10 is manufactured. Further, the calibration described above is performed every time power is supplied, for example, in actual use after the optical position detection device 10 is shipped.

（本形態の主な効果）
以上説明したように、本形態の光学式位置検出装置１０および位置検出機能付き表示装置１００では、位置検出光Ｌ２ａ〜Ｌ２ｄが導光板１３の光出射面１３ｓから出射され、これが導光板１３の出射側に配置された対象物体Ｏｂによって反射されると、この反射光が光検出器１５によって検出される。ここで、検出領域１０Ｒにおける位置検出光Ｌ２ａ〜Ｌ２ｄの強度と位置検出用光源１２Ａ〜１２Ｄからの距離とが所定の相関性を有しているので、光検出器１５を介して得られた受光強度から対象物体ＯｂのＸＹ座標を検出することができる。 (Main effects of this form)
As described above, in the optical position detection device 10 and the display device with a position detection function 100 according to this embodiment, the position detection lights L2a to L2d are emitted from the light exit surface 13s of the light guide plate 13, and this is emitted from the light guide plate 13. When reflected by the target object Ob arranged on the side, the reflected light is detected by the photodetector 15. Here, since the intensities of the position detection lights L2a to L2d in the detection region 10R and the distances from the position detection light sources 12A to 12D have a predetermined correlation, the light reception obtained through the photodetector 15 is obtained. The XY coordinates of the target object Ob can be detected from the intensity.

また、かかる検出方式によれば、スクリーン部材２２０の一方面２２０ｓ側に位置検出光の光強度分布を形成すればよいので、必ずしもスクリーン部材２２０の前側に導光板１３を配置する必要がないので、スクリーン部材２２０に画像を表示するタイプの位置検出機能付き表示装置１００を構成するのに適している。   Further, according to such a detection method, it is only necessary to form a light intensity distribution of the position detection light on the one surface 220s side of the screen member 220. Therefore, the light guide plate 13 does not necessarily need to be disposed on the front side of the screen member 220. It is suitable for configuring the display device 100 with a position detection function that displays an image on the screen member 220.

さらに、本形態では、検出領域１０Ｒに形成した位置検出光の強度分布を利用して対象物体Ｏｂの位置を検出することから、強度分布の絶対強度、あるいは順次形成した強度分布の相対強度が一定であることが必要である。このため、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正を行なう。かかる校正の際、位置検出用光源１２Ｂ、１２Ｄ（第２位置検出用光源）は、光検出器１５が位置する側とは反対の第２方向Ｙ２に発光部１２１が向いているため、検出領域１０Ｒ内に対象物体Ｏｂが存在しない場合、位置検出光が光検出器１５に入射しない。しかるに本形態では、光検出器１５の受光部１５１に発光部１２１を向けた補助光源（第１補助光源１２Ｖおよび第２補助光源１２Ｗ）を備えており、位置検出用光源１２Ｂ、１２Ｄの出射光量の校正を行なう際、位置検出用光源１２Ｂ、１２Ｄと同時に駆動された第１補助光源１２Ｖおよび第２補助光源１２Ｗから出射された光を光検出器１５に入射させる。このため、第１補助光源１２Ｖおよび第２補助光源１２Ｗから出射された光の検出結果に基づいて、第２位置検出用光源（位置検出用光源１２Ｂ、１２Ｄ）のみを点灯させた状態での出射光量の校正を行なうことができる。   Further, in the present embodiment, the position of the target object Ob is detected using the intensity distribution of the position detection light formed in the detection region 10R, so that the absolute intensity of the intensity distribution or the relative intensity of the sequentially formed intensity distribution is constant. It is necessary to be. For this reason, the emitted light quantity of the position detection light sources 12A to 12D is calibrated. At the time of such calibration, the position detection light sources 12B and 12D (second position detection light sources) are directed to the light emitting unit 121 in the second direction Y2 opposite to the side where the light detector 15 is located. When the target object Ob does not exist within 10R, the position detection light does not enter the photodetector 15. However, in this embodiment, auxiliary light sources (first auxiliary light source 12V and second auxiliary light source 12W) having the light emitting unit 121 facing the light receiving unit 151 of the photodetector 15 are provided, and the emitted light amounts of the position detection light sources 12B and 12D. When the calibration is performed, the light emitted from the first auxiliary light source 12V and the second auxiliary light source 12W driven simultaneously with the position detection light sources 12B and 12D is made incident on the photodetector 15. For this reason, based on the detection result of the light emitted from the first auxiliary light source 12V and the second auxiliary light source 12W, the emission in a state where only the second position detection light sources (position detection light sources 12B and 12D) are turned on. The light quantity can be calibrated.

また、第１補助光源１２Ｖおよび第２補助光源１２Ｗから出射された光に対しては、検出領域１０Ｒ内への進入を阻止する遮光部（第１遮光部１９１および第２遮光部１９２）が設けられているため、第１補助光源１２Ｖおよび第２補助光源１２Ｗから出射された光によって位置検出が妨げられることがない。   In addition, a light-shielding part (first light-shielding part 191 and second light-shielding part 192) that prevents the light emitted from the first auxiliary light source 12V and the second auxiliary light source 12W from entering the detection region 10R is provided. Therefore, position detection is not hindered by the light emitted from the first auxiliary light source 12V and the second auxiliary light source 12W.

［実施の形態２］
（全体構成）
図５は、本発明の実施の形態２に係る位置検出機能付き表示装置の構成を模式的に示す説明図であり、図５（ａ）、（ｂ）は、位置検出機能付き表示装置の要部を斜め上からみた様子を模式的に示す説明図、および横方向からみた様子を模式的に示す説明図である。図６は、本発明の実施の形態２に係る光学式位置検出装置１０の構成を示す説明図であり、図６（ａ）、（ｂ）、（ｃ）は、光学式位置検出装置１０の断面構成を模式的に示す説明図、光学式位置検出装置に用いた導光板１３などの構成を示す説明図、および導光板１３内での位置検出用赤外光の減衰状態を示す説明図である。なお、本形態の基本的な構成は、実施の形態１と同様であるため、共通する部分には同一の符号を付して図示し、それらの説明を省略する。 [Embodiment 2]
(overall structure)
FIG. 5 is an explanatory view schematically showing a configuration of a display device with a position detection function according to Embodiment 2 of the present invention. FIGS. 5 (a) and 5 (b) are views of the display device with a position detection function. It is explanatory drawing which shows a mode that the part was seen from diagonally upward, and explanatory drawing which shows a mode that it looked at from the horizontal direction. FIG. 6 is an explanatory diagram showing the configuration of the optical position detection device 10 according to the second embodiment of the present invention. FIGS. 6 (a), (b), and (c) are diagrams of the optical position detection device 10. FIG. 3 is an explanatory diagram schematically showing a cross-sectional configuration, an explanatory diagram showing a configuration of a light guide plate 13 and the like used in the optical position detection device, and an explanatory diagram showing an attenuation state of position detection infrared light in the light guide plate 13. is there. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

図５（ａ）、（ｂ）に示す位置検出機能付き表示装置１００は、光学式位置検出装置１０と画像生成装置２００とを備えており、光学式位置検出装置１０は、画像生成装置２００によって表示された画像に基づいて指などの対象物体を検出領域１０Ｒに接近させた際、対象物体Ｏｂの平面的な位置（Ｘ座標位置およびＹ座標位置）を検出する。光学式位置検出装置１０は、赤外光からなる位置検出光を放出する複数の位置検出用光源１２を備えた位置検出用光源装置１１と、検出領域１０Ｒに受光部１５１を向けた第１光検出器１５Ａとを有している。本形態において、位置検出用光源装置１１は、ＸＹ平面に平行に配置された導光板１３も備えている。光検出器１５は、フォトダイオードやフォトトランジスターなどの受光素子を備えている。画像生成装置２００は投射型であり、導光板１３の前面側（入力操作側）に重ねて配置されたスクリーン部材２２０と、スクリーン部材２２０の一方面２２０ｓ側に表示光を拡大投射する画像投射装置２５０とを有しており、画像生成装置２００は、スクリーン部材２２０上に画像表示領域２０Ｒを有している。   A display device with a position detection function 100 shown in FIGS. 5A and 5B includes an optical position detection device 10 and an image generation device 200, and the optical position detection device 10 is provided by the image generation device 200. When a target object such as a finger is brought close to the detection region 10R based on the displayed image, the planar position (X coordinate position and Y coordinate position) of the target object Ob is detected. The optical position detection device 10 includes a position detection light source device 11 including a plurality of position detection light sources 12 that emit position detection light composed of infrared light, and first light with a light receiving unit 151 directed to a detection region 10R. Detector 15A. In this embodiment, the position detection light source device 11 also includes a light guide plate 13 arranged in parallel to the XY plane. The photodetector 15 includes a light receiving element such as a photodiode or a phototransistor. The image generation apparatus 200 is a projection type, and an image projection apparatus that enlarges and projects display light on the screen member 220 disposed on the front surface side (input operation side) of the light guide plate 13 and the one surface 220 s side of the screen member 220. The image generation apparatus 200 has an image display area 20 </ b> R on the screen member 220.

図６（ａ）、（ｂ）に示すように、本形態の光学式位置検出装置１０において、位置検出用光源装置１１は、長方形の平面形状を有する導光板１３を備えており、導光板１３の側端面１３ｍのうち、角部分１３ｅ、１３ｆ、１３ｇ、１３ｈには、位置検出用光源１２Ａ〜１２Ｄが配置されている。   As shown in FIGS. 6A and 6B, in the optical position detection device 10 of this embodiment, the position detection light source device 11 includes a light guide plate 13 having a rectangular planar shape. Position detection light sources 12A to 12D are arranged at corner portions 13e, 13f, 13g, and 13h of the side end surface 13m.

検出領域１０Ｒは、位置検出光Ｌ２ａ〜Ｌ２ｄが視認側（操作側）に出射される領域であり、対象物体Ｏｂによる反射光が生じうる領域である。本形態において、検出領域１０Ｒの平面形状は、四角形状であり、４つの辺部分１０ａ〜１０ｄのうち、１つの辺部分１０ｂ（第１辺部分）の長さ方向の略中央部分に隣接する箇所に第１光検出器１５Ａが配置されている。第１光検出器１５Ａは、検出領域１０Ｒに受光部１５１を向けており、その中心光軸Ｌ１５Ａは、辺部分１０ａ（第２辺部分）および辺部分１０ｂに直交し、辺部分１０ｃ、１０ｄに平行である。   The detection region 10R is a region where the position detection lights L2a to L2d are emitted to the viewing side (operation side), and is a region where reflected light from the target object Ob can be generated. In the present embodiment, the planar shape of the detection region 10R is a quadrangular shape, and a location adjacent to a substantially central portion in the length direction of one side portion 10b (first side portion) among the four side portions 10a to 10d. The first photo detector 15A is arranged in the first. The first light detector 15A has the light receiving portion 151 facing the detection region 10R, and its center optical axis L15A is orthogonal to the side portion 10a (second side portion) and the side portion 10b, and to the side portions 10c and 10d. Parallel.

また、本形態において、検出領域１０Ｒの辺部分１０ｄ（第３辺部分）の長さ方向の略中央部分に隣接する箇所には第２光検出器１５Ｂが配置されている。第２光検出器１５Ｂは、検出領域１０Ｒに受光部１５１を向けており、その中心光軸Ｌ１５Ｂは、第１光検出器１５Ａの中心光軸Ｌ１５Ａと直交している。   In the present embodiment, the second photodetector 15B is disposed at a location adjacent to the substantially central portion in the length direction of the side portion 10d (third side portion) of the detection region 10R. The second photodetector 15B has the light receiving portion 151 facing the detection region 10R, and the center optical axis L15B is orthogonal to the center optical axis L15A of the first photodetector 15A.

ここで、導光板１３と検出領域１０Ｒとは、長辺同士（辺部分１３ｋ、１０ａ同士、辺部分１３ｌ、１０ｂ同士）が同一の方向に位置し、短辺同士（辺部分１３ｉ、１０ｄ同士、辺部分１３ｊ、１０ｃ同士）が同一の方向に位置している。従って、導光板１３において、位置検出用光源１２Ｂ、１２Ｄが配置された角部分１３ｆ、１３ｈは、検出領域１０Ｒの辺部分１０ｂ（第１辺部分の両側に位置する２つの第１角部分）に相当する位置である。また、導光板１３において、位置検出用光源１２Ａ、１２Ｃが配置された角部分１３ｅ、１３ｇは、検出領域１０Ｒの辺部分１０ａ（第２辺部分の両側に位置する２つの第２角部分）に相当する位置である。   Here, the light guide plate 13 and the detection region 10R have long sides (side portions 13k, 10a, side portions 13l, 10b) located in the same direction, and short sides (side portions 13i, 10d, The side portions 13j and 10c) are located in the same direction. Accordingly, in the light guide plate 13, the corner portions 13f and 13h where the position detection light sources 12B and 12D are arranged are located on the side portions 10b of the detection region 10R (two first corner portions located on both sides of the first side portion). Corresponding position. In the light guide plate 13, the corner portions 13e and 13g where the position detection light sources 12A and 12C are arranged are located on the side portions 10a of the detection region 10R (two second corner portions located on both sides of the second side portion). Corresponding position.

第１光検出器１５Ａには、位置検出部４５１を備えた集積回路４５０が接続されており、位置検出部４５１は、第１光検出器１５Ａでの検出結果に基づいて、対象物体Ｏｂの位置を検出する。また、位置検出部４５１は、第１光検出器１５Ａおよび第２光検出器５Ｂ双方での検出結果、あるいは第２光検出器５Ｂでの検出結果に基づいて、対象物体Ｏｂの位置を検出することもできる。   An integrated circuit 450 including a position detector 451 is connected to the first photodetector 15A, and the position detector 451 detects the position of the target object Ob based on the detection result of the first photodetector 15A. Is detected. Further, the position detection unit 451 detects the position of the target object Ob based on the detection result of both the first photodetector 15A and the second photodetector 5B or the detection result of the second photodetector 5B. You can also.

このように構成した位置検出機能付き表示装置１００において、位置検出光Ｌ２ａと位置検出光Ｌ２ｂは、導光板１３の内部では、矢印Ａで示す方向において互いに逆向きに伝播しながら、光出射面１３ｓから出射される。また、位置検出光Ｌ２ｃと位置検出光Ｌ２ｄは、矢印Ａで示す方向に対して交差する方向（矢印Ｂで示す方向）において互いに逆向きに伝播しながら光出射面１３ｓから出射される。従って、導光板１３から検出領域１０Ｒに出射される位置検出光Ｌ２ａの光量は、図６（ｃ）に実線で示すように、位置検出用光源１２Ａからの距離に伴って直線的に減衰する強度分布を有することになる。また、検出領域１０Ｒに出射される位置検出光Ｌ２ｂの光量は、図６（ｃ）に点線で示すように、位置検出用光源１２Ｂからの距離に伴って直線的に減衰する強度分布を有することになる。   In the display device 100 with the position detection function configured as described above, the position detection light L2a and the position detection light L2b are propagated in the opposite directions in the direction indicated by the arrow A inside the light guide plate 13, and the light emission surface 13s. It is emitted from. In addition, the position detection light L2c and the position detection light L2d are emitted from the light emission surface 13s while propagating in directions opposite to each other in a direction intersecting the direction indicated by the arrow A (direction indicated by the arrow B). Accordingly, the intensity of the position detection light L2a emitted from the light guide plate 13 to the detection region 10R is linearly attenuated with the distance from the position detection light source 12A, as indicated by a solid line in FIG. Will have a distribution. Further, the light amount of the position detection light L2b emitted to the detection region 10R has an intensity distribution that linearly attenuates with the distance from the position detection light source 12B, as indicated by a dotted line in FIG. 6C. become.

（本形態の位置検出方法）
図７は、本発明の実施の形態２に係る光学式位置検出装置での位置検出方法を示す説明図であり、図７（ａ）、（ｂ）は各々、導光板１３（検出領域１０Ｒ）の長辺方向（Ｘ軸方向）の位置検出、および短辺方向（Ｙ軸方向）の位置検出を行なう場合の説明図である。 (Position detection method of this embodiment)
FIG. 7 is an explanatory diagram showing a position detection method in the optical position detection device according to the second embodiment of the present invention, and FIGS. 7A and 7B respectively show the light guide plate 13 (detection region 10R). It is explanatory drawing in the case of performing position detection of the long side direction (X-axis direction) and position detection of the short side direction (Y-axis direction).

本形態の光学式位置検出装置１０においても、実施の形態１と同様、検出領域１０Ｒにおける対象物体ＯｂのＸ座標位置を検出するには、位置検出用光源装置１１において、光源駆動回路４６０は、図７（ａ）に示すように、位置検出用光源１２Ａ、１２Ｄを同相で駆動し、位置検出用光源１２Ｂ、１２Ｃを同相で駆動し、かつ、位置検出用光源１２Ａ、１２Ｄと位置検出用光源１２Ｂ、１２Ｃとを逆相で駆動する。すなわち、位置検出用光源１２Ａ、１２Ｄを点灯させ、位置検出用光源１２Ｂ、１２Ｃを消灯させてＸ軸方向の一方方向が高い強度分布を形成する第１期間と、位置検出用光源１２Ｂ、１２Ｃを点灯させ、位置検出用光源１２Ａ、１２Ｄを消灯させてＸ軸方向の他方方向の出射強度が高い強度分布を形成する第２期間とを交互に設定する。従って、位置検出部４５１において、第１期間と第２期間とにおける第１光検出器１５Ａの検出値の比や差を用いれば、検出領域１０Ｒでの対象物体ＯｂのＸ座標を検出することができる。   Also in the optical position detection device 10 of the present embodiment, in order to detect the X coordinate position of the target object Ob in the detection region 10R, the light source drive circuit 460 in the position detection light source device 11 is similar to the first embodiment. As shown in FIG. 7A, the position detection light sources 12A and 12D are driven in the same phase, the position detection light sources 12B and 12C are driven in the same phase, and the position detection light sources 12A and 12D and the position detection light source are driven. 12B and 12C are driven in reverse phase. That is, the position detection light sources 12A and 12D are turned on, the position detection light sources 12B and 12C are turned off, and a first intensity distribution in one direction in the X-axis direction is formed, and the position detection light sources 12B and 12C. The second period in which the light is turned on and the position detection light sources 12A and 12D are turned off to form an intensity distribution with a high emission intensity in the other direction in the X-axis direction is alternately set. Accordingly, the position detection unit 451 can detect the X coordinate of the target object Ob in the detection region 10R by using the ratio or difference between the detection values of the first photodetector 15A in the first period and the second period. it can.

また、検出領域１０Ｒにおける対象物体ＯｂのＹ座標位置を検出するには、位置検出用光源装置１１において、光源駆動回路４６０は、図７（ｂ）に示すように、位置検出用光源１２Ａ、１２Ｃを同相で駆動し、位置検出用光源１２Ｂ、１２Ｄを同相で駆動し、かつ、位置検出用光源１２Ａ、１２Ｃと位置検出用光源１２Ｂ、１２Ｄとを逆相で駆動する。すなわち、位置検出用光源１２Ａ、１２Ｃを点灯させ、位置検出用光源１２Ｂ、１２Ｄを消灯させてＹ軸方向の一方方向が高い強度分布を形成する第１期間と、位置検出用光源１２Ｂ、１２Ｄを点灯させ、位置検出用光源１２Ａ、１２Ｃを消灯させてＹ軸方向の他方方向の出射強度が高い強度分布を形成する第２期間とを交互に設定する。従って、位置検出部４５０において、第１期間と第２期間とにおける第１光検出器１５Ａの検出値の比や差を用いれば、検出領域１０Ｒでの対象物体ＯｂのＹ座標を検出することができる。   Further, in order to detect the Y-coordinate position of the target object Ob in the detection region 10R, the light source driving circuit 460 in the position detection light source device 11 includes the position detection light sources 12A and 12C as shown in FIG. Are driven in the same phase, the position detection light sources 12B and 12D are driven in the same phase, and the position detection light sources 12A and 12C and the position detection light sources 12B and 12D are driven in the opposite phase. That is, the position detection light sources 12A and 12C are turned on, the position detection light sources 12B and 12D are turned off, and a first intensity distribution in one direction in the Y-axis direction is formed, and the position detection light sources 12B and 12D The second period in which the light is turned on and the position detection light sources 12A and 12C are turned off to form an intensity distribution with a high emission intensity in the other direction in the Y-axis direction is alternately set. Therefore, the position detection unit 450 can detect the Y coordinate of the target object Ob in the detection region 10R by using the ratio or difference between the detection values of the first photodetector 15A in the first period and the second period. it can.

なお、４つの位置検出用光源１２Ａ〜１２Ｄを同時に点灯させてＺ軸方向に位置検出光の強度分布を形成し、Ｚ座標の検出を行なってもよい。   It is also possible to detect the Z coordinate by simultaneously turning on the four position detection light sources 12A to 12D to form an intensity distribution of the position detection light in the Z-axis direction.

（位置検出用光源の校正）
図８は、本発明の実施の形態２に係る光学式位置検出装置での校正方法を示す説明図である。本形態の光学式位置検出装置１０では、検出領域１０Ｒの面内方向に位置検出光の強度分布を順次逆向きで形成し、かかる検出領域１０Ｒにおいて対象物体Ｏｂにより反射した位置検出光を光検出器１５で検出する。従って、検出領域１０Ｒの面内方向に順次逆向きで形成した位置検出光では、強度分布の絶対強度あるいは相対強度が一定であることが必要である。このため、本形態では、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ａ〜１２Ｄを順次点灯させ、その間の光検出器１５での受光結果に基づいて、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正を行なう。また、本形態では、図６に示すように、集積回路４５０には、第１光検出器１５Ａおよび第２光検出器１５Ｂから受光結果が出力される光源校正部４５３が設けられており、光源校正部４５３は、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正に基づいて、位置検出の際に光源駆動回路４６０から位置検出用光源１２Ａ〜１２Ｄに供給される駆動電流の補正を行う。 (Calibration of light source for position detection)
FIG. 8 is an explanatory diagram showing a calibration method in the optical position detection device according to the second embodiment of the present invention. In the optical position detection device 10 of the present embodiment, the intensity distribution of the position detection light is sequentially formed in the reverse direction in the in-plane direction of the detection region 10R, and the position detection light reflected by the target object Ob in the detection region 10R is detected. Detect with detector 15. Therefore, it is necessary that the absolute intensity or relative intensity of the intensity distribution is constant in the position detection light formed in the reverse direction in the in-plane direction of the detection region 10R. For this reason, in the present embodiment, the position detection light sources 12A to 12D are sequentially turned on in the absence of the target object Ob, and the position detection light sources 12A to 12D are emitted based on the light reception results of the light detector 15 during that time. Calibrate the light intensity. In this embodiment, as shown in FIG. 6, the integrated circuit 450 is provided with a light source calibration unit 453 that outputs light reception results from the first photodetector 15A and the second photodetector 15B. The calibration unit 453 corrects the drive current supplied from the light source drive circuit 460 to the position detection light sources 12A to 12D at the time of position detection based on the calibration of the emitted light amount of the position detection light sources 12A to 12D.

ここで、第１光検出器１５Ａの中心光軸Ｌ１５Ａの延在方向、および中心光軸Ｌ１５Ａに平行な仮想線の延在方向において、第１光検出器１５Ａが位置する側を第１方向Ｙ１とし、第１光検出器１５Ａが位置する側とは反対側を第２方向Ｙ２としたとき、位置検出用光源１２Ａ〜１２Ｄのうち、位置検出用光源１２Ａ、１２Ｃは、発光部１２１を第１方向Ｙ１に向けた第１位置検出用光源として構成されている。これに対して、位置検出用光源１２Ｂ、１２Ｄは、発光部１２１を第２方向Ｙ２に向けた第２位置検出用光源として構成されており、かかる位置検出用光源１２Ｂ、１２Ｄ（第２位置検出用光源）から出射された位置検出光Ｌ２ｂ、Ｌ２ｄは、対象物体Ｏｂが存在しない状態では第１光検出器１５Ａに入射しない。   Here, in the extending direction of the central optical axis L15A of the first photodetector 15A and the extending direction of the imaginary line parallel to the central optical axis L15A, the side where the first photodetector 15A is located is the first direction Y1. When the second direction Y2 is the side opposite to the side where the first photodetector 15A is located, among the position detection light sources 12A to 12D, the position detection light sources 12A and 12C have the light emitting unit 121 as the first light source 121. The light source is configured as a first position detection light source directed in the direction Y1. On the other hand, the position detection light sources 12B and 12D are configured as second position detection light sources with the light emitting unit 121 directed in the second direction Y2, and the position detection light sources 12B and 12D (second position detection). The position detection lights L2b and L2d emitted from the light source for use do not enter the first photodetector 15A when the target object Ob does not exist.

ここで、本形態の光学式位置検出装置１０には、検出領域１０Ｒの辺部分１０ｄ（第３辺部分）の長さ方向の略中央部分に隣接する箇所に第２光検出器１５Ｂが配置されており、かかる第２光検出器１５Ｂの中心光軸Ｌ１５Ｂは、第１光検出器１５Ａの中心光軸Ｌ１５Ａと直交している。このため、位置検出用光源１２Ｂ、１２Ｄ（第２位置検出用光源）は、第１光検出器１５Ａが位置する側とは反対側の第２方向Ｙ２に発光部１２１を向けているが、位置検出用光源１２Ｂ、１２Ｄ（第２位置検出用光源）のうち、位置検出用光源１２Ｂは、第２光検出器１５Ｂが位置する側に発光部１２１を向けている。このため、位置検出用光源１２Ｂ、１２Ｄから出射された位置検出光Ｌ２ｂ、Ｌ２ｄのうち、位置検出用光源１２Ｂから出射された位置検出光Ｌ２ｂは、第２光検出器１５Ｂに入射する。   Here, in the optical position detection device 10 of the present embodiment, the second photodetector 15B is arranged at a location adjacent to the substantially central portion in the length direction of the side portion 10d (third side portion) of the detection region 10R. The central optical axis L15B of the second photodetector 15B is orthogonal to the central optical axis L15A of the first photodetector 15A. Therefore, the position detection light sources 12B and 12D (second position detection light sources) point the light emitting unit 121 in the second direction Y2 opposite to the side where the first photodetector 15A is located. Of the detection light sources 12B and 12D (second position detection light source), the position detection light source 12B has the light emitting unit 121 facing the side where the second photodetector 15B is located. Therefore, of the position detection lights L2b and L2d emitted from the position detection light sources 12B and 12D, the position detection light L2b emitted from the position detection light source 12B is incident on the second photodetector 15B.

このように構成した光学式位置検出装置１０において、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正を行なうには、まず、Ｘ軸方向における位置検出のための校正を行なう。より具体的には、図８（ａ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ｂ、１２Ｃを点灯させる一方、位置検出用光源１２Ａ、１２Ｄを消灯させて、矢印Ｘａで示す方向の強度分布を形成する。次に、図８（ｂ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ａ、１２Ｄを点灯させる一方、位置検出用光源１２Ｂ、１２Ｃを消灯させて、矢印Ｘｂで示す方向の強度分布を形成する。その間、第１光検出器１５Ａでの検出結果は、図６に示す集積回路４５０の光源校正部４５３に出力され、光源校正部４５３において校正が行なわれる。かかる校正の際、位置検出用光源１２Ｂ、１２Ｃから出射された位置検出光Ｌ２ｂ、Ｌ２ｃ、および位置検出用光源１２Ａ、１２Ｄから出射された位置検出光Ｌ２ａ、Ｌ２ｄは、その一部が第１光検出器１５Ａに入射するので、校正を行なうことができる。   In the optical position detection apparatus 10 configured as described above, in order to calibrate the emitted light quantity of the position detection light sources 12A to 12D, first, calibration for position detection in the X-axis direction is performed. More specifically, as shown in FIG. 8A, the position detection light sources 12B and 12C are turned on in the absence of the target object Ob, while the position detection light sources 12A and 12D are turned off, and the arrow Xa An intensity distribution in the direction indicated by is formed. Next, as shown in FIG. 8B, the position detection light sources 12A and 12D are turned on in the state where the target object Ob does not exist, while the position detection light sources 12B and 12C are turned off, and the direction indicated by the arrow Xb. Form an intensity distribution. Meanwhile, the detection result of the first photodetector 15A is output to the light source calibration unit 453 of the integrated circuit 450 shown in FIG. 6, and the light source calibration unit 453 performs calibration. During the calibration, part of the position detection light L2b and L2c emitted from the position detection light sources 12B and 12C and the position detection light L2a and L2d emitted from the position detection light sources 12A and 12D are part of the first light. Since the light enters the detector 15A, calibration can be performed.

これに対して、Ｙ軸方向における位置検出のための校正を行なうには、まず、図８（ｃ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ｂ、１２Ｄを点灯させる一方、位置検出用光源１２Ａ、１２Ｃを消灯させて、矢印Ｙａで示す方向の強度分布を形成する。次に、図８（ｄ）に示すように、対象物体Ｏｂが存在しない状態で位置検出用光源１２Ａ、１２Ｃを点灯させる一方、位置検出用光源１２Ｂ、１２Ｄを消灯させて、矢印Ｙｂで示す方向の強度分布を形成する。   On the other hand, in order to perform calibration for position detection in the Y-axis direction, first, as shown in FIG. 8C, the position detection light sources 12B and 12D are turned on in the absence of the target object Ob. On the other hand, the position detection light sources 12A and 12C are turned off to form an intensity distribution in the direction indicated by the arrow Ya. Next, as shown in FIG. 8 (d), the position detection light sources 12A and 12C are turned on in the absence of the target object Ob, while the position detection light sources 12B and 12D are turned off, and the direction indicated by the arrow Yb. Form an intensity distribution.

かかる校正の際、図８（ｃ）に示す工程では、位置検出用光源１２Ｂ、１２Ｄから出射された位置検出光Ｌ２ｂ、Ｌ２ｄは、第１光検出器１５Ａに入射しないが、位置検出用光源１２Ｂから出射された位置検出光Ｌ２ｂは第２光検出器１５Ｂに入射する。そこで、本形態では、図８（ｃ）、（ｄ）に示す校正の際は、第２光検出器１５Ｂでの受光結果が、図６に示す集積回路４５０の光源校正部４５３に出力され、光源校正部４５３において校正が行なわれる。従って、発光部１２１を第２方向Ｙ２（光検出器１５が位置する側とは反対側）に向けた第２位置検出用光源（位置検出用光源１２Ｂ、１２Ｄ）のみを点灯させた状態での出射光量の校正を行なうことができる。なお、図８（ｄ）に示す校正の際、位置検出用光源１２Ａから出射された位置検出光Ｌ２ａは、第２光検出器１５Ｂに入射しないが、位置検出用光源１２Ｃから出射された位置検出光Ｌ２ｃは第２光検出器１５Ｂに入射するので、校正に支障はない。   At the time of such calibration, in the step shown in FIG. 8C, the position detection light L2b and L2d emitted from the position detection light sources 12B and 12D do not enter the first photodetector 15A, but the position detection light source 12B. The position detection light L2b emitted from the light enters the second photodetector 15B. Therefore, in this embodiment, at the time of calibration shown in FIGS. 8C and 8D, the light reception result by the second photodetector 15B is output to the light source calibration unit 453 of the integrated circuit 450 shown in FIG. The light source calibration unit 453 performs calibration. Therefore, only the second position detection light source (position detection light sources 12B and 12D) with the light emitting unit 121 directed in the second direction Y2 (the side opposite to the side where the photodetector 15 is located) is turned on. The emitted light quantity can be calibrated. In the calibration shown in FIG. 8D, the position detection light L2a emitted from the position detection light source 12A does not enter the second photodetector 15B, but the position detection light emitted from the position detection light source 12C. Since the light L2c is incident on the second photodetector 15B, there is no problem in calibration.

かかる校正を行なった後、光源校正部４５３は、図８（ａ）に矢印Ｘａで示す方向の強度分布と、図８（ｂ）に矢印Ｘｂで示す方向の強度分布とが等しく、かつ、図８（ｃ）に矢印Ｙａで示す方向の強度分布と、図８（ｄ）に矢印Ｙｂで示す方向の強度分布とが等しくなるように、位置検出の際に光源駆動回路４６０から位置検出用光源１２Ａ〜１２Ｄに供給される駆動電流の補正を行う。かかる校正は、光学式位置検出装置１０を製造した際に行なわれる。また、上記の校正は、光学式位置検出装置１０が出荷された後、実使用の際、例えば、電源供給が実施される度に行われる。   After performing such calibration, the light source calibration unit 453 has the same intensity distribution in the direction indicated by the arrow Xa in FIG. 8A and the intensity distribution in the direction indicated by the arrow Xb in FIG. A light source for position detection from the light source driving circuit 460 at the time of position detection so that the intensity distribution in the direction indicated by the arrow Ya in FIG. 8C and the intensity distribution in the direction indicated by the arrow Yb in FIG. The drive current supplied to 12A to 12D is corrected. Such calibration is performed when the optical position detection apparatus 10 is manufactured. Further, the calibration described above is performed every time power is supplied, for example, in actual use after the optical position detection device 10 is shipped.

（本形態の主な効果）
以上説明したように、本形態の光学式位置検出装置１０および位置検出機能付き表示装置１００では、位置検出光Ｌ２ａ〜Ｌ２ｄが導光板１３の光出射面１３ｓから出射され、これが導光板１３の出射側に配置された対象物体Ｏｂによって反射されると、この反射光が第１光検出器１５Ａによって検出される。ここで、検出領域１０Ｒにおける位置検出光Ｌ２ａ〜Ｌ２ｄの強度と位置検出用光源１２Ａ〜１２Ｄからの距離とが所定の相関性を有しているので、第１光検出器１５Ａを介して得られた受光強度から対象物体ＯｂのＸＹ座標を検出することができる。 (Main effects of this form)
As described above, in the optical position detection device 10 and the display device with a position detection function 100 according to this embodiment, the position detection lights L2a to L2d are emitted from the light exit surface 13s of the light guide plate 13, and this is emitted from the light guide plate 13. When reflected by the target object Ob arranged on the side, this reflected light is detected by the first photodetector 15A. Here, since the intensities of the position detection lights L2a to L2d in the detection region 10R and the distances from the position detection light sources 12A to 12D have a predetermined correlation, they are obtained via the first photodetector 15A. The XY coordinates of the target object Ob can be detected from the received light intensity.

また、かかる検出方式によれば、スクリーン部材２２０の一方面２２０ｓ側に位置検出光の光強度分布を形成すればよいので、必ずしもスクリーン部材２２０の前側に導光板１３を配置する必要がないので、スクリーン部材２２０に画像を表示するタイプの位置検出機能付き表示装置１００を構成するのに適している。   Further, according to such a detection method, it is only necessary to form a light intensity distribution of the position detection light on the one surface 220s side of the screen member 220. Therefore, the light guide plate 13 does not necessarily need to be disposed on the front side of the screen member 220. It is suitable for configuring the display device 100 with a position detection function that displays an image on the screen member 220.

さらに、本形態では、検出領域１０Ｒに形成した位置検出光の強度分布を利用して対象物体Ｏｂの位置を検出することから、強度分布の絶対強度、あるいは順次形成した強度分布の相対強度が一定であることが必要である。このため、位置検出用光源１２Ａ〜１２Ｄの出射光量の校正を行なう。かかる校正の際、位置検出用光源１２Ｂ、１２Ｄ（第２位置検出用光源）は、第１光検出器１５Ａが位置する側とは反対の第２方向Ｙ２に発光部１２１が向いているため、検出領域１０Ｒ内に対象物体Ｏｂが存在しない場合、位置検出光が第１光検出器１５Ａに入射しない。しかるに本形態では、検出領域１０Ｒの辺部分１０ｄに隣接する箇所には第２光検出器１５Ｂが配置され、第２光検出器１５Ｂの中心光軸Ｌ１５Ｂは、第１光検出器１５Ａの中心光軸Ｌ１５Ａと直交している。このため、位置検出用光源１２Ｂ、１２Ｄのうち、位置検出用光源１２Ｂから出射された位置検出光は、第２光検出器１５Ｂに入射する。このため、第２光検出器１５Ｂでの受光結果に基づいて、第２位置検出用光源（位置検出用光源１２Ｂ、１２Ｄ）のみを点灯させた状態での出射光量の校正を行なうことができる。   Further, in the present embodiment, the position of the target object Ob is detected using the intensity distribution of the position detection light formed in the detection region 10R, so that the absolute intensity of the intensity distribution or the relative intensity of the sequentially formed intensity distribution is constant. It is necessary to be. For this reason, the emitted light quantity of the position detection light sources 12A to 12D is calibrated. During the calibration, the position detection light sources 12B and 12D (second position detection light sources) are directed to the light emitting unit 121 in the second direction Y2 opposite to the side where the first photodetector 15A is located. When the target object Ob does not exist in the detection region 10R, the position detection light does not enter the first photodetector 15A. However, in the present embodiment, the second photodetector 15B is disposed at a location adjacent to the side portion 10d of the detection region 10R, and the central optical axis L15B of the second photodetector 15B is the central light of the first photodetector 15A. It is orthogonal to the axis L15A. For this reason, of the position detection light sources 12B and 12D, the position detection light emitted from the position detection light source 12B is incident on the second photodetector 15B. For this reason, it is possible to calibrate the amount of emitted light when only the second position detection light source (position detection light sources 12B and 12D) is lit based on the light reception result of the second photodetector 15B.

［実施の形態２の変形例］
上記実施の形態２では、第２光検出器１５Ｂを検出領域１０Ｒの辺部分１０ｄに隣接する箇所に設けたが、検出領域１０Ｒの辺部分１０ａに隣接する箇所に受光部１５１を第１方向Ｙ１に向けて第２光検出器１５Ｂを配置してもよい。 [Modification of Embodiment 2]
In the second embodiment, the second photodetector 15B is provided at a location adjacent to the side portion 10d of the detection region 10R. However, the light receiving unit 151 is provided at a location adjacent to the side portion 10a of the detection region 10R in the first direction Y1. You may arrange | position the 2nd photodetector 15B toward.

［他の実施の形態］
上記実施の形態では、スクリーン部材２２０の他方面２２０ｔ側に位置検出用光源装置１１を配置したが、スクリーン部材２２０の一方面２２０ｓ側に位置検出用光源装置１１を配置してもよい。上記実施の形態では、投射型表示装置に本発明を適用したが、電子黒板に本発明を適用してもよい。 [Other embodiments]
In the above embodiment, the position detection light source device 11 is disposed on the other surface 220t side of the screen member 220. However, the position detection light source device 11 may be disposed on the one surface 220s side of the screen member 220. In the above embodiment, the present invention is applied to the projection display device, but the present invention may be applied to an electronic blackboard.

［位置検出機能付き表示装置１００の変形例］
上記実施の形態では位置検出機能付き表示装置１００を投射型表示装置や電子黒板に適用した例であったが、図９〜図１２に示すように、直視型の表示装置を画像生成装置２００として採用すれば、図１３を参照して後述する電子機器に用いることができる。なお、以下に説明では、図１〜図４や図５〜図８を参照して説明した校正のための構成（補助光源など）の図示は省略してある。 [Modification of Display Device 100 with Position Detection Function]
In the above embodiment, the display device with a position detection function 100 is applied to a projection display device or an electronic blackboard. However, as shown in FIGS. 9 to 12, a direct-view display device is used as the image generation device 200. If it is adopted, it can be used in an electronic device to be described later with reference to FIG. In the following description, the calibration configuration (auxiliary light source and the like) described with reference to FIGS. 1 to 4 and FIGS. 5 to 8 is omitted.

（位置検出機能付き表示装置１００の変形例１）
図９および図１０は、本発明の変形例１に係る光学式位置検出装置１０および位置検出機能付き表示装置１００の分解斜視図、および断面構成を示す説明図である。なお、本形態の位置検出機能付き表示装置１００において、光学式位置検出装置１０の構成は、上記実施の形態と同様であるため、共通する部分については同一の符号を付してそれらの説明を省略する。 (Modification 1 of the display device 100 with a position detection function)
9 and 10 are an exploded perspective view and an explanatory view showing a cross-sectional configuration of the optical position detection device 10 and the display device 100 with a position detection function according to Modification 1 of the present invention. In addition, in the display device 100 with a position detection function of the present embodiment, the configuration of the optical position detection device 10 is the same as that of the above-described embodiment. Omitted.

図９および図１０に示す位置検出機能付き表示装置１００は、光学式位置検出装置１０と画像生成装置２００とを備えており、光学式位置検出装置１０は、位置検出光を放出する位置検出用光源１２と、導光板１３と、検出領域１０Ｒに受光部１５１を向けた光検出器１５（光検出器１５Ａ、１５Ｂ、１５Ｃ）とを備えている。画像生成装置２００は、有機エレクトロルミネッセンス装置やプラズマ表示装置などといった直視型表示装置２０８であり、光学式位置検出装置１０に対して入力操作側とは反対に設けられている。直視型表示装置２０８は、導光板１３に対して平面視で重なる領域に画像表示領域２０Ｒを備えており、かかる画像表示領域２０Ｒは検出領域１０Ｒと平面視で重なっている。   The display device 100 with a position detection function shown in FIGS. 9 and 10 includes an optical position detection device 10 and an image generation device 200. The optical position detection device 10 is for position detection that emits position detection light. The light source 12, the light guide plate 13, and the light detector 15 (light detectors 15A, 15B, and 15C) having the light receiving unit 151 facing the detection region 10R are provided. The image generation device 200 is a direct-view display device 208 such as an organic electroluminescence device or a plasma display device, and is provided opposite to the input operation side with respect to the optical position detection device 10. The direct-view display device 208 includes an image display region 20R in a region overlapping the light guide plate 13 in plan view, and the image display region 20R overlaps with the detection region 10R in plan view.

（位置検出機能付き表示装置１００の変形例２）
図１１および図１２は、本発明の変形例２に係る光学式位置検出装置１０および位置検出機能付き表示装置１００の説明図であり、図１１および図１２は各々、光学式位置検出装置１０および位置検出機能付き表示装置１００の分解斜視図、および断面構成を示す説明図である。なお、本形態の位置検出機能付き表示装置１００において、光学式位置検出装置１０の構成は、上記実施の形態と同様であるため、共通する部分については同一の符号を付してそれらの説明を省略する。 (Modification 2 of the display device 100 with a position detection function)
FIGS. 11 and 12 are explanatory diagrams of the optical position detection device 10 and the display device 100 with a position detection function according to the second modification of the present invention. FIGS. 11 and 12 respectively show the optical position detection device 10 and the optical position detection device 10. It is explanatory drawing which shows the disassembled perspective view of the display apparatus with a position detection function 100, and a cross-sectional structure. In addition, in the display device 100 with a position detection function of the present embodiment, the configuration of the optical position detection device 10 is the same as that of the above-described embodiment. Omitted.

図１１および図１２に示す位置検出機能付き表示装置１００は、光学式位置検出装置１０と画像生成装置２００とを備えており、光学式位置検出装置１０は、位置検出光を放出する位置検出用光源１２と、導光板１３と、検出領域１０Ｒに受光部１５１を向けた光検出器１５（光検出器１５Ａ、１５Ｂ、１５Ｃ）とを備えている。画像生成装置２００は、直視型表示装置である液晶装置２０９と、透光性のカバー部材３０とを備えている。液晶装置２０９は、導光板１３に対して平面視で重なる領域に画像表示領域２０Ｒを備えており、かかる画像表示領域２０Ｒは検出領域１０Ｒと平面視で重なっている。   The display device 100 with a position detection function shown in FIGS. 11 and 12 includes an optical position detection device 10 and an image generation device 200. The optical position detection device 10 is for position detection that emits position detection light. The light source 12, the light guide plate 13, and the light detector 15 (light detectors 15A, 15B, and 15C) having the light receiving unit 151 facing the detection region 10R are provided. The image generation device 200 includes a liquid crystal device 209 that is a direct-view display device, and a translucent cover member 30. The liquid crystal device 209 includes an image display region 20R in a region overlapping the light guide plate 13 in plan view, and the image display region 20R overlaps with the detection region 10R in plan view.

本形態の位置検出機能付き表示装置１００において、導光板１３の光出射側には、必要に応じて、位置検出光Ｌ２ａ〜Ｌ２ｄの均―化を図るための光学シート１６が配置されている。本形態においては、光学シート１６として、導光板１３の光出射面１３ｓに対向する第１プリズムシート１６１と、第１プリズムシート１６１に対して導光板１３が位置する側とは反対側で対向する第２プリズムシート１６２と、第２プリズムシート１６２に対して導光板１３が位置する側とは反対側で対向する光散乱板１６３とが用いられている。なお、光学シート１６に対して導光板１３が位置する側とは反対側には矩形枠状の遮光シート１７が光学シート１６の周囲に配置されている。かかる遮光シート１７は、位置検出用光源１２Ａ〜１２Ｄから出射された位置検出光Ｌ２ａ〜Ｌ２ｄが漏れるのを防止する。   In the display device with a position detection function 100 according to the present embodiment, an optical sheet 16 for leveling the position detection lights L2a to L2d is arranged on the light emitting side of the light guide plate 13 as necessary. In this embodiment, as the optical sheet 16, the first prism sheet 161 facing the light exit surface 13s of the light guide plate 13 is opposed to the first prism sheet 161 on the side opposite to the side where the light guide plate 13 is located. A second prism sheet 162 and a light scattering plate 163 facing the second prism sheet 162 on the side opposite to the side where the light guide plate 13 is located are used. A light shielding sheet 17 having a rectangular frame shape is disposed around the optical sheet 16 on the side opposite to the side where the light guide plate 13 is located with respect to the optical sheet 16. The light shielding sheet 17 prevents the position detection lights L2a to L2d emitted from the position detection light sources 12A to 12D from leaking.

液晶装置２０９（画像生成装置２００）は、光学シート１６（第１プリズムシート１６１、第２プリズムシート１６２および光散乱板１６３）に対して導光板１３が位置する側とは反対側に液晶パネル２０９ａを備えている。本形態において、液晶パネル２０９ａは、透過型の液晶パネルであり、２枚の透光性基板２１、２２をシール材２３で貼り合わせ、基板間に液晶２４を充填した構造を有している。本形態において、液晶パネル２０９ａは、アクティブマトリクス型液晶パネルであり、２枚の透光性基板２１、２２の一方側には透光性の画素電極、データ線、走査線、画素スイッチング素子（図示せず）が形成され、他方側には透光性の共通電極（図示せず）が形成されている。なお、画素電極および共通電極が同一の基板に形成されることもある。かかる液晶パネル２０９ａでは、各画素に対して走査線を介して走査信号が出力され、データ線を介して画像信号が出力されると、複数の画素の各々で液晶２４の配向が制御される結果、画像表示領域２０Ｒに画像が形成される。   The liquid crystal device 209 (the image generation device 200) includes a liquid crystal panel 209a on the opposite side of the optical sheet 16 (the first prism sheet 161, the second prism sheet 162, and the light scattering plate 163) from the side where the light guide plate 13 is located. It has. In this embodiment, the liquid crystal panel 209a is a transmissive liquid crystal panel, and has a structure in which two light-transmitting substrates 21 and 22 are bonded together with a sealing material 23 and a liquid crystal 24 is filled between the substrates. In this embodiment, the liquid crystal panel 209a is an active matrix liquid crystal panel, and on one side of the two light transmissive substrates 21 and 22, a light transmissive pixel electrode, a data line, a scanning line, and a pixel switching element (see FIG. (Not shown) is formed, and a translucent common electrode (not shown) is formed on the other side. Note that the pixel electrode and the common electrode may be formed on the same substrate. In the liquid crystal panel 209a, when a scanning signal is output to each pixel through the scanning line and an image signal is output through the data line, the orientation of the liquid crystal 24 is controlled in each of the plurality of pixels. An image is formed in the image display area 20R.

液晶パネル２０９ａにおいて、一方の透光性基板２１には、他方の透光性基板２２の外形より周囲に張り出した基板張出部２１ｔが設けられている。この基板張出部２１ｔの表面上には駆動回路などを構成する電子部品２５が実装されている。また、基板張出部２１ｔには、フレキシブル配線基板（ＦＰＣ）などの配線部材２６が接続されている。なお、基板張出部２１ｔ上には配線部材２６のみが実装されていてもよい。なお、必要に応じて透光性基板２１、２２の外面側には偏光板（図示せず）が配置される。   In the liquid crystal panel 209a, one translucent substrate 21 is provided with a substrate overhanging portion 21t that projects from the outer shape of the other translucent substrate 22 to the periphery. An electronic component 25 constituting a drive circuit or the like is mounted on the surface of the substrate extension portion 21t. Further, a wiring member 26 such as a flexible wiring board (FPC) is connected to the board projecting portion 21t. Note that only the wiring member 26 may be mounted on the substrate overhanging portion 21t. In addition, a polarizing plate (not shown) is arrange | positioned at the outer surface side of the translucent board | substrates 21 and 22 as needed.

ここで、対象物体Ｏｂの平面位置を検出するためには、位置検出光Ｌ２ａ〜Ｌ２ｄを対象物体Ｏｂによる操作が行われる視認側へ出射させる必要があり、液晶パネル２０９ａは、導光板１３および光学シート１６よりも視認側（操作側）に配置されている。従って、液晶パネル２０９ａにおいて、画像表示領域２０Ｒは、位置検出光Ｌ２ａ〜Ｌ２ｄを透過可能に構成される。なお、液晶パネル２０９ａが導光板１３の視認側とは反対側に配置される場合には、画像表示領域２０Ｒが位置検出光Ｌ２ａ〜Ｌ２ｄを透過するように構成されている必要はないが、その代りに、画像表示領域２０Ｒが導光板１３を通して視認側より透視可能に構成される必要がある。   Here, in order to detect the planar position of the target object Ob, it is necessary to emit the position detection lights L2a to L2d to the viewing side where the operation by the target object Ob is performed. The liquid crystal panel 209a includes the light guide plate 13 and the optical It is arranged closer to the viewing side (operation side) than the sheet 16. Therefore, in the liquid crystal panel 209a, the image display region 20R is configured to be able to transmit the position detection lights L2a to L2d. When the liquid crystal panel 209a is arranged on the side opposite to the viewing side of the light guide plate 13, the image display region 20R does not need to be configured to transmit the position detection lights L2a to L2d. Instead, the image display area 20 </ b> R needs to be configured to be seen through from the viewing side through the light guide plate 13.

液晶装置２０９は、液晶パネル２０９ａを照明するための照明装置４０を備えている。本形態において、照明装置４０は、導光板１３に対して液晶パネル２０９ａが位置する側とは反対側において導光板１３と反射板１４との間に配置されている。照明装置４０は、照明用光源４１と、この照明用光源４１から放出される照明光を伝播させながら出射する照明用導光板４３とを備えており、照明用導光板４３は、矩形の平面形状を備えている。照明用光源４１は、例えばＬＥＤ（発光ダイオード）などの発光素子で構成され、駆動回路（図示せず）から出力される駆動信号に応じて、例えば白色の照明光Ｌ４を放出する。本形態において、照明用光源４１は、照明用導光板４３の辺部分４３ａに沿って複数、配列されている。   The liquid crystal device 209 includes an illumination device 40 for illuminating the liquid crystal panel 209a. In this embodiment, the illuminating device 40 is disposed between the light guide plate 13 and the reflection plate 14 on the side opposite to the side where the liquid crystal panel 209a is located with respect to the light guide plate 13. The illumination device 40 includes an illumination light source 41 and an illumination light guide plate 43 that emits the illumination light emitted from the illumination light source 41 while propagating the illumination light. The illumination light guide plate 43 has a rectangular planar shape. It has. The illumination light source 41 is composed of a light emitting element such as an LED (light emitting diode), for example, and emits, for example, white illumination light L4 in accordance with a drive signal output from a drive circuit (not shown). In this embodiment, a plurality of illumination light sources 41 are arranged along the side portion 43 a of the illumination light guide plate 43.

照明用導光板４３は、辺部分４３ａに隣接する光出射側の表面部分（光出射面４３ｓの辺部分４３ａ側の外周部）に傾斜面４３ｇが設けられ、照明用導光板４３は、辺部分４３ａに向けて厚みが徐々に増加している。かかる傾斜面４３ｇを有する入光構造によって、光出射面４３ｓが設けられる部分の厚みの増加を抑制しつつ、辺部分４３ａの高さを照明用光源４１の光放出面の高さに対応させてある。   The light guide plate 43 for illumination is provided with an inclined surface 43g on the surface portion on the light emission side adjacent to the side portion 43a (the outer peripheral portion of the light emission surface 43s on the side portion 43a side). The thickness gradually increases toward 43a. With the light incident structure having the inclined surface 43g, the height of the side portion 43a is made to correspond to the height of the light emitting surface of the illumination light source 41 while suppressing an increase in the thickness of the portion where the light emitting surface 43s is provided. is there.

かかる照明装置４０において、照明用光源４１から出射された照明光は、照明用導光板４３の辺部分４３ａから照明用導光板４３の内部に入射した後、照明用導光板４３の内部を反対側の外縁部４３ｂに向けて伝播し、一方の表面である光出射面４３ｓから出射される。ここで、照明用導光板４３は、辺部分４３ａ側から反対側の外縁部４３ｂに向けて内部伝播光に対する光出射面４３ｓからの出射光の光量比率が単調に増加する導光構造を有している。かかる導光構造は、例えば、照明用導光板４３の光出射面４３ｓ、または背面４３ｔに形成された光偏向用あるいは光散乱用の微細な凹凸形状の屈折面の面積、印刷された散乱層の形成密度などを上記内部伝播方向に向けて徐々に高めることで実現される。このような導光構造を設けることで、辺部分４３ａから入射した照明光Ｌ４は光出射面４３ｓからほぼ均一に出射される。   In such an illuminating device 40, the illumination light emitted from the illumination light source 41 enters the illumination light guide plate 43 from the side portion 43 a of the illumination light guide plate 43, and then the inside of the illumination light guide plate 43 on the opposite side. It propagates toward the outer edge 43b of the light and is emitted from the light exit surface 43s which is one surface. Here, the light guide plate 43 for illumination has a light guide structure in which the light amount ratio of the emitted light from the light emitting surface 43s to the internally propagated light monotonously increases from the side portion 43a side to the outer edge portion 43b on the opposite side. ing. Such a light guide structure is, for example, an area of a fine concavo-convex refracting surface for light deflection or light scattering formed on the light exit surface 43 s or the back surface 43 t of the light guide plate 43 for illumination, and the printed scattering layer. This is realized by gradually increasing the formation density toward the internal propagation direction. By providing such a light guide structure, the illumination light L4 incident from the side portion 43a is emitted substantially uniformly from the light emission surface 43s.

本形態において、照明用導光板４３は、液晶パネル２０９ａの視認側とは反対側で液晶パネル２０９ａの画像表示領域２０Ｒと平面的に重なるように配置され、いわゆるバックライトとして機能する。但し、照明用導光板４３を液晶パネル２０９ａの視認側に配置して、いわゆるフロントライトとして機能するように構成してもよい。また、本形態において、照明用導光板４３は導光板１３と反射板１４との間に配置されているが、照明用導光板４３を光学シート１６と導光板１３との間に配置してもよい。また、照明用導光板４３と導光板１３とは共通の導光板として構成してもよい。また、本形態では、光学シート１６を位置検出光Ｌ２ａ〜Ｌ２ｄと照明光Ｌ４との間で共用としている。但し、照明用導光板４３の光出射側に、上記の光学シート１６とは別の専用の光学シートを配置してもよい。これは、照明用導光板４３においては光出射面４３ｓから出射される照明光Ｌ４の平面輝度を均―化することを目的に、十分な光散乱作用を呈する光散乱板を用いることが多いが、位置検出用の導光板１３においては光出射面１３ｓから出射される位置検出光Ｌ２ａ〜Ｌ２ｄを大きく散乱させてしまうと位置検出の妨げとなる。このため、光散乱板を設けないか、あるいは比較的軽度の光散乱作用を呈する光散乱板を用いる必要があることから、光散乱板については照明用導光板４３の専用品とすることが好ましい。但し、プリズムシート（第１プリズムシート１６１や第２プリズムシート１６２）などの集光作用のある光学シートについては共用としても構わない。   In the present embodiment, the illumination light guide plate 43 is disposed on the opposite side to the viewing side of the liquid crystal panel 209a so as to overlap the image display region 20R of the liquid crystal panel 209a in a planar manner, and functions as a so-called backlight. However, the illumination light guide plate 43 may be arranged on the viewing side of the liquid crystal panel 209a so as to function as a so-called front light. In this embodiment, the illumination light guide plate 43 is disposed between the light guide plate 13 and the reflection plate 14. However, the illumination light guide plate 43 may be disposed between the optical sheet 16 and the light guide plate 13. Good. Moreover, you may comprise the light guide plate 43 for illumination and the light guide plate 13 as a common light guide plate. In this embodiment, the optical sheet 16 is shared between the position detection lights L2a to L2d and the illumination light L4. However, a dedicated optical sheet different from the optical sheet 16 may be disposed on the light emitting side of the light guide plate 43 for illumination. This is because the illumination light guide plate 43 often uses a light scattering plate exhibiting a sufficient light scattering action for the purpose of equalizing the planar luminance of the illumination light L4 emitted from the light emission surface 43s. In the position detection light guide plate 13, if the position detection lights L2a to L2d emitted from the light exit surface 13s are greatly scattered, the position detection is hindered. For this reason, it is necessary to use a light scattering plate that does not have a light scattering plate, or to use a light scattering plate that exhibits a relatively light light scattering action. . However, an optical sheet having a light collecting function such as a prism sheet (the first prism sheet 161 or the second prism sheet 162) may be shared.

（電子機器への搭載例）
図１３を参照しながら、図９〜図１２を参照して説明した位置検出機能付き表示装置１００を適用した電子機器について説明する。図１３は、本発明に係る位置検出機能付き表示装置を用いた電子機器の説明図である。図１３（ａ）に、位置検出機能付き表示装置１００を備えたモバイル型のパーソナルコンピューターの構成を示す。パーソナルコンピューター２０００は、表示ユニットとしての位置検出機能付き表示装置１００と本体部２０１０を備える。本体部２０１０には、電源スイッチ２００１、およびキーボード２００２が設けられている。図１３（ｂ）に、位置検出機能付き表示装置１００を備えた携帯電話機の構成を示す。携帯電話機３０００は、複数の操作ボタン３００１、およびスクロールボタン３００２、並びに表示ユニットとしての位置検出機能付き表示装置１００を備える。スクロールボタン３００２を操作することによって、位置検出機能付き表示装置１００に表示される画面がスクロールされる。図１３（ｃ）に、位置検出機能付き表示装置１００を適用した情報携帯端末（ＰＤＡ：Personal Digital Assistants）の構成を示す。情報携帯端末４０００は、複数の操作ボタン４００１、および電源スイッチ４００２、並びに表示ユニットとしての位置検出機能付き表示装置１００を備える。電源スイッチ４００２を操作すると、住所録やスケジュール帳といった各種の情報が位置検出機能付き表示装置１００に表示される。 (Example of mounting on electronic equipment)
With reference to FIG. 13, an electronic apparatus to which the display device with a position detection function 100 described with reference to FIGS. 9 to 12 is applied will be described. FIG. 13 is an explanatory diagram of an electronic apparatus using the display device with a position detection function according to the present invention. FIG. 13A shows a configuration of a mobile personal computer including the display device 100 with a position detection function. The personal computer 2000 includes a display device 100 with a position detection function as a display unit and a main body 2010. The main body 2010 is provided with a power switch 2001 and a keyboard 2002. FIG. 13B shows a configuration of a mobile phone provided with the display device 100 with a position detection function. The cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the display device 100 with a position detection function as a display unit. By operating the scroll button 3002, the screen displayed on the display device with a position detection function 100 is scrolled. FIG. 13C shows the configuration of a portable information terminal (PDA: Personal Digital Assistants) to which the display device with a position detection function 100 is applied. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and the display device 100 with a position detection function as a display unit. When the power switch 4002 is operated, various types of information such as an address book and a schedule book are displayed on the display device 100 with a position detection function.

なお、位置検出機能付き表示装置１００が適用される電子機器としては、図１３に示すものの他、デジタルスチールカメラ、液晶テレビ、ビューファインダー型、モニター直視型のビデオテープレコーダー、カーナビゲーション装置、ページャー、電子手帳、電卓、ワードプロセッサー、ワークステーション、テレビ電話、ＰＯＳ端末、銀行端末などの電子機器などが挙げられる。そして、これらの各種電子機器の表示部として、前述した位置検出機能付き表示装置１００が適用可能である。   The electronic device to which the display device with a position detection function 100 is applied is not only the one shown in FIG. 13 but also a digital still camera, a liquid crystal television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, Examples include electronic notebooks, calculators, word processors, workstations, videophones, POS terminals, bank terminals, and other electronic devices. And the display apparatus 100 with a position detection function mentioned above is applicable as a display part of these various electronic devices.

１０・・光学式位置検出装置、１０Ｒ・・検出領域、１１・・位置検出用光源装置、１２Ａ、１２Ｃ・・位置検出用光源（第１位置検出用光源）、１２Ｂ、１２Ｄ・・位置検出用光源（第２位置検出用光源）、１２Ｖ・・第１補助光源、１２Ｗ・・第２補助光源、１３・・導光板、１５・・光検出器、１５Ａ・・第１光検出器、１５Ｂ・・第２光検出器、１９１、１９２・・遮光部、４５０・・集積回路、４５１・・位置検出部、４５３・・光源校正部、４６０・・光源駆動回路、１００・・位置検出機能付き表示装置、２００・・画像生成装置、Ｌ２ａ、Ｌ２ｂ、Ｌ２ｃ、Ｌ２ｄ・・位置検出光 10 .... Optical position detection device, 10R ... Detection area, 11 .... Light source device for position detection, 12A, 12C ... Light source for position detection (first position detection light source), 12B, 12D ... For position detection Light source (second position detection light source), 12V, first auxiliary light source, 12 W, second auxiliary light source, 13, light guide plate, 15 photo detector, 15A first photo detector, 15B .. Second light detector, 191, 192 .. Light-shielding part, 450 .. Integrated circuit, 451 .. Position detection part, 453 .. Light source calibration part, 460 .. Light source drive circuit, 100 .. Display with position detection function Device, 200... Image generation device, L2a, L2b, L2c, L2d .. Position detection light

Claims (13)

検出領域内の対象物体の位置を光学的に検出するための光学式位置検出装置であって、
前記検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、
前記検出領域に隣接する位置で当該検出領域に受光部を向ける光検出器と、
前記対象物体で反射した前記位置検出光の前記光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、
を有し、
前記位置検出用光源装置は、前記検出領域に位置検出光を出射する複数の位置検出用光源と、前記光検出器の受光部に発光部を向けた補助光源と、該補助光源から出射された光の前記検出領域内への進入を阻止する遮光部と、を備えていることを特徴とする光学式位置検出装置。 An optical position detection device for optically detecting the position of a target object in a detection region,
A position detection light source device that emits position detection light to the detection region and forms an intensity distribution of the position detection light in the detection region;
A photodetector for directing the light receiving unit to the detection region at a position adjacent to the detection region;
A position detection unit that detects the position of the target object based on a light reception result of the position detection light reflected by the target object at the photodetector;
Have
The position detection light source device includes a plurality of position detection light sources that emit position detection light to the detection region, an auxiliary light source having a light emitting portion directed to a light receiving portion of the photodetector, and the auxiliary light source An optical position detection device comprising: a light shielding unit that prevents light from entering the detection region. 前記補助光源は、前記複数の位置検出用光源の少なくとも一部と同時に駆動されることを特徴とする請求項１に記載の光学式位置検出装置。   The optical position detection apparatus according to claim 1, wherein the auxiliary light source is driven simultaneously with at least a part of the plurality of position detection light sources. 前記光検出器の中心光軸の延在方向および該中心光軸に平行な仮想線の延在方向において前記光検出器が位置する側を第１方向とし、前記光検出器が位置する側とは反対側を第２方向としたとき、
前記位置検出用光源装置は、前記位置検出用光源として、前記第１方向に発光部を向けて前記位置検出光を放出する第１位置検出用光源と、前記第２方向に発光部を向けて前記位置検出光を放出する第２位置検出用光源と、を備え、
前記補助光源は、前記第２位置検出用光源と同時に駆動されることを特徴とする請求項２に記載の光学式位置検出装置。 The side in which the photodetector is located in the extending direction of the central optical axis of the photodetector and the extending direction of the virtual line parallel to the central optical axis is defined as a first direction, and the side in which the photodetector is located When the opposite side is the second direction,
In the position detection light source device, as the position detection light source, a first position detection light source that emits the position detection light by directing a light emission unit in the first direction, and a light emission unit in the second direction. A second position detection light source that emits the position detection light,
The optical position detection apparatus according to claim 2, wherein the auxiliary light source is driven simultaneously with the second position detection light source. 前記第２位置検出用光源と前記補助光源とは、並列あるいは直列に電気的接続されていることを特徴とする請求項３に記載の光学式位置検出装置。   The optical position detection device according to claim 3, wherein the second position detection light source and the auxiliary light source are electrically connected in parallel or in series. 前記検出領域は四角形の平面形状を備え、
前記光検出器は、前記検出領域の第１辺部分に隣接する位置において当該第１辺部分に対向する第２辺部分に中心光軸を向けて配置され、
前記第２位置検出用光源は、前記検出領域の前記第１辺部分の両側に位置する２つの第１角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、
前記第１位置検出用光源は、前記第２辺部分の両側に位置する２つの第２角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、
前記補助光源として、前記２つの第１角部分のうちの一方の第１角部分に相当する位置に設けられた前記第２位置検出用光源と同時に駆動される第１補助光源と、他方の第１角部分に相当する位置に設けられた前記第２位置検出用光源と同時に駆動される第２補助光源と、が設けられていることを特徴とする請求項３または４に記載の光学式位置検出装置。 The detection area has a rectangular planar shape,
The photodetector is disposed with a central optical axis directed to a second side portion facing the first side portion at a position adjacent to the first side portion of the detection region,
The second position detection light source is arranged with the light emitting portion facing the diagonal direction of the detection region at a position corresponding to two first corner portions located on both sides of the first side portion of the detection region,
The light source for first position detection is arranged with the light emitting portion facing the diagonal direction of the detection region at a position corresponding to two second corner portions located on both sides of the second side portion,
As the auxiliary light source, a first auxiliary light source that is driven simultaneously with the second position detection light source provided at a position corresponding to one of the two first corner portions, and the other first light source. 5. The optical position according to claim 3, further comprising: a second auxiliary light source that is driven simultaneously with the second position detection light source provided at a position corresponding to a corner portion. Detection device. 前記位置検出用光源装置は、前記位置検出用光源から放出された前記位置検出光を内部に採り込んで光出射面から出射する導光板を備え、
当該導光板の前記光出射面に平面視で重なる位置に前記検出領域が設けられていることを特徴とする１乃至５の何れか一項に記載の光学式位置検出装置。 The position detection light source device includes a light guide plate that takes in the position detection light emitted from the position detection light source and emits the light from a light exit surface.
The optical position detection device according to any one of claims 1 to 5, wherein the detection region is provided at a position overlapping the light emitting surface of the light guide plate in plan view. 検出領域内の対象物体の位置を光学的に検出するための光学式位置検出装置であって、
前記検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、
前記検出領域に隣接する位置で当該検出領域に中心光軸を向ける第１光検出器と、
前記対象物体で反射した前記位置検出光の前記第１光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、
を有し、
前記位置検出用光源装置は、前記位置検出光を放出する複数の位置検出用光源を備え、
前記検出領域に隣接する位置には、前記第１光検出器の中心光軸に直交する方向、あるいは前記第１方向に中心光軸を向けた第２光検出器を備えていることを特徴とする光学式位置検出装置。 An optical position detection device for optically detecting the position of a target object in a detection region,
A position detection light source device that emits position detection light to the detection region and forms an intensity distribution of the position detection light in the detection region;
A first photodetector for directing a central optical axis toward the detection region at a position adjacent to the detection region;
A position detection unit for detecting the position of the target object based on a light reception result of the position detection light reflected by the target object at the first photodetector;
Have
The position detection light source device includes a plurality of position detection light sources that emit the position detection light,
A position adjacent to the detection region includes a second photodetector having a direction perpendicular to a central optical axis of the first photodetector or a central optical axis directed to the first direction. Optical position detection device. 前記第１光検出器の中心光軸の延在方向および該中心光軸に平行な仮想線の延在方向において前記第１光検出器が位置する側を第１方向とし、前記第１光検出器が位置する側とは反対側を第２方向としたとき、
前記位置検出用光源装置は、前記位置検出用光源として、前記第１方向に発光部を向けて前記位置検出光を放出する第１位置検出用光源と、前記第２方向に発光部を向けて前記位置検出光を放出する第２位置検出用光源と、を備えていることを特徴とする請求項７に記載の光学式位置検出装置。 The side where the first photodetector is located in the extending direction of the central optical axis of the first photodetector and the extending direction of the imaginary line parallel to the central optical axis is defined as a first direction, and the first light detection When the side opposite to the side where the vessel is located is the second direction,
In the position detection light source device, as the position detection light source, a first position detection light source that emits the position detection light by directing a light emission unit in the first direction, and a light emission unit in the second direction. The optical position detection device according to claim 7, further comprising: a second position detection light source that emits the position detection light. 前記検出領域は四角形の平面形状を備え、
前記第１光検出器は、前記検出領域の第１辺部分に隣接する位置において当該第１辺部分に対向する第２辺部分に中心光軸を向けて配置され、
前記第２位置検出用光源は、前記検出領域の前記第１辺部分の両側に位置する２つの第１角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、
前記第１位置検出用光源は、前記第２辺部分の両側に位置する２つの第２角部分に相当する位置で発光部を前記検出領域の対角方向に向けて配置され、
前記第２光検出器は、前記検出領域の４つの辺部分のうち、前記第１辺部を除く３つの辺部分のいずれかに隣接する位置に配置されていることを特徴とする請求項８に記載の光学式位置検出装置。 The detection area has a rectangular planar shape,
The first photodetector is disposed with a central optical axis directed to a second side portion facing the first side portion at a position adjacent to the first side portion of the detection region,
The second position detection light source is arranged with the light emitting portion facing the diagonal direction of the detection region at a position corresponding to two first corner portions located on both sides of the first side portion of the detection region,
The light source for first position detection is arranged with the light emitting portion facing the diagonal direction of the detection region at a position corresponding to two second corner portions located on both sides of the second side portion,
The said 2nd photodetector is arrange | positioned in the position adjacent to either of the 3 side parts except the said 1st side part among the four side parts of the said detection area | region. An optical position detection apparatus according to 1. 前記位置検出用光源装置は、前記位置検出用光源から放出された前記位置検出光を内部に採り込んで光出射面から出射する導光板を備え、
当該導光板の前記光出射面に平面視で重なる位置に前記検出領域が設けられていることを特徴とする請求項７乃至９の何れか一項に記載の光学式位置検出装置。 The position detection light source device includes a light guide plate that takes in the position detection light emitted from the position detection light source and emits the light from a light exit surface.
The optical position detection device according to any one of claims 7 to 9, wherein the detection region is provided at a position overlapping the light emitting surface of the light guide plate in a plan view. 請求項１乃至１０の何れか一項に記載の光学式位置検出装置を備えた位置検出機能付き表示装置であって、
前記検出領域に対して平面的に重なる領域に画像を形成する画像生成装置を有していることを特徴とする位置検出機能付き表示装置。 A display device with a position detection function comprising the optical position detection device according to any one of claims 1 to 10,
A display device with a position detection function, comprising: an image generation device that forms an image in a region that overlaps the detection region in a planar manner. 検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、前記検出領域に隣接する位置で当該検出領域に受光部を向ける光検出器と、前記対象物体で反射した前記位置検出光の前記光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、を有する光学式位置検出装置の校正方法であって、
前記位置検出用光源装置には、前記位置検出光を出射する複数の位置検出用光源と、前記光検出器の受光部に発光部を向けた補助光源と、該補助光源から出射された光の前記検出領域内への進入を阻止する遮光部と、を設けておき、
前記複数の位置検出用光源のうちの少なくとも一部の位置検出用光源の出射光量の校正については、前記補助光源から出射された光の前記受光素子での検出結果に基づいて行なうことを特徴とする光学式位置検出装置における校正方法。 A light source device for position detection that emits position detection light to the detection area and forms an intensity distribution of the position detection light in the detection area, and a photodetector that directs the light receiving unit to the detection area at a position adjacent to the detection area And a position detection unit that detects the position of the target object based on a light reception result of the position detection light reflected by the target object at the photodetector. ,
The position detection light source device includes a plurality of position detection light sources that emit the position detection light, an auxiliary light source that directs a light emitting unit toward a light receiving unit of the photodetector, and light emitted from the auxiliary light source. A light shielding portion for preventing entry into the detection region, and
The calibration of the emitted light quantity of at least some of the plurality of position detection light sources is performed based on the detection result of the light emitted from the auxiliary light source at the light receiving element. Calibration method for an optical position detection device. 検出領域に位置検出光を出射して当該検出領域に前記位置検出光の強度分布を形成する位置検出用光源装置と、前記検出領域に隣接する位置で当該検出領域に受光部を向ける第１光検出器と、前記対象物体で反射した前記位置検出光の前記第１光検出器での受光結果に基づいて前記対象物体の位置を検出する位置検出部と、を有する光学式位置検出装置の校正方法であって、
前記検出領域に隣接する位置に、前記第１光検出器の中心光軸に直交する方向あるいは前記第１方向に中心光軸を向けた第２光検出器を設けておき、
前記位置検出用光源装置に設けられた複数の位置検出用光源のうちの少なくとも一部の位置検出用光源の出射光量の校正については、前記第２光検出器での受光結果に基づいて行なうことを特徴とする光学式位置検出装置における校正方法。 A light source device for position detection that emits position detection light to the detection area and forms an intensity distribution of the position detection light in the detection area, and first light that directs the light receiving unit to the detection area at a position adjacent to the detection area Calibration of an optical position detection apparatus comprising: a detector; and a position detection unit that detects a position of the target object based on a light reception result of the position detection light reflected by the target object at the first photodetector. A method,
In a position adjacent to the detection region, a second photodetector having a central optical axis directed in the direction orthogonal to the first optical detector or in the first direction is provided,
Calibration of the amount of light emitted from at least some of the plurality of position detection light sources provided in the position detection light source device is performed based on a light reception result of the second photodetector. A calibration method in an optical position detection device characterized by the above.
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