WO2011101894A1 - タッチパネル装置 - Google Patents
タッチパネル装置 Download PDFInfo
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- WO2011101894A1 WO2011101894A1 PCT/JP2010/000991 JP2010000991W WO2011101894A1 WO 2011101894 A1 WO2011101894 A1 WO 2011101894A1 JP 2010000991 W JP2010000991 W JP 2010000991W WO 2011101894 A1 WO2011101894 A1 WO 2011101894A1
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- touch panel
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- infrared light
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Definitions
- the present invention relates to a touch panel device that detects a touch position by a capacitance method.
- Patent Document 1 discloses a conventional touch panel device.
- This apparatus includes an infrared light sensor that detects infrared light.
- the infrared light sensor reflects reflected infrared light generated by reflecting infrared light for detection by a pointing means such as a finger, and external light. Infrared light contained in the light is detected.
- the received light signal corresponding to each of the reflected infrared light detected by the infrared light sensor and the infrared light included in the external light is processed by the received light signal processing circuit unit in the apparatus, and the processed received light signal is It is transferred to the detection / light intensity detection circuit unit.
- the position detection / light intensity detection circuit unit detects that the instruction unit overlaps an area where the infrared light sensor that detects the reflected infrared light is arranged in the image display area of the touch screen. Thereby, the position of the instruction means can be specified accurately.
- the display device described in Patent Document 2 includes a contact body and a part of the counter electrode between the contact body and the surface of the counter substrate that is opposite to the surface on which the counter electrode is formed.
- the contact position of the contact body is detected by detecting the formed capacitance.
- a plurality of counter electrodes are formed in a long shape so as to extend along the signal lines formed on the active matrix substrate.
- the surface display device described in Patent Document 3 includes a display device substrate on which an electrode for supplying an electric signal to a display element element that responds electro-optically, and is formed on a surface corresponding to a display region.
- a display region having an impedance surface and a current detection circuit for detecting a current flowing through the impedance surface, and an electrode for supplying an electric signal to the display element element during a period in which the current detection circuit detects the current from the outside of the display region
- At least one of the electrodes that transmits an electric signal to the inside of the substrate is set to high impedance.
- the current detection circuit detects the current
- at least one of the wirings or electrodes arranged from the outside to the inside of the display area among the wirings or electrodes for supplying an electric signal to the display element element is set to high impedance.
- the S / N of the position detection signal can be improved and the cost of the signal processing circuit can be reduced.
- the switching element is kept off in the display device substrate, the display characteristics are not deteriorated.
- the present invention was made to solve the above-described problems, and when detecting the touch position by the electrostatic capacity method, even if the detection sensitivity of the instruction means is increased, it is hardly affected by surrounding noise, An object of the present invention is to obtain a touch panel device that can suppress the occurrence of malfunction.
- a touch panel device includes a capacitive touch panel, a detection unit that receives probe light irradiated on the touch surface of the touch panel and detects the presence or absence of shielding of the probe light from the received light intensity, And a control unit that performs touch position detection by a capacitive method of the touch panel when the shielding is detected by the detection unit.
- the present invention even if the detection sensitivity of the instruction means is increased, there is an effect that it is difficult to be influenced by ambient noise and the like, and the occurrence of malfunction can be suppressed.
- FIG. 1 is a graph showing a relationship between a pressed position on a touch surface and a detected capacitance in a capacitive touch panel device.
- the touch input is detected based on whether or not the detection capacity exceeds a predetermined threshold.
- the detected capacity has a characteristic that is greatly influenced by the type of the instruction means, and the threshold value A is usually set assuming a capacity characteristic A1 generated by touch input with a bare finger.
- the threshold for touch position determination needs to be set to a threshold B smaller than the threshold A.
- setting the threshold B increases the sensitivity to changes in capacitance, so it is erroneously affected by changes in capacitance due to ambient noise such as static sparks, and changes in capacitance due to water droplets generated by condensation on the touch surface. The possibility of operation increases.
- detection of the touch position by the capacitive method is started when the instruction means blocks the infrared light for detection irradiated in parallel to the touch surface.
- the detection operation is started only when the instruction means actually exists on the touch surface and is surely pressed. Therefore, it is difficult to be affected by ambient noise and dew condensation on the touch surface, and the occurrence of malfunction can be suppressed.
- FIG. 2 is a diagram showing the configuration of the touch panel device according to Embodiment 1 of the present invention.
- FIG. 2 (a) shows the internal configuration viewed from the side
- FIG. 2 (b) viewed from the touch surface side.
- the configuration is shown.
- the touch panel device 1 according to the first embodiment includes an infrared light source 2, prisms 3 a and 3 b, a touch panel 4, a photosensor 5, a liquid crystal module 6, and a control unit 7.
- the infrared light source 2 and the prism 3 a are provided at positions facing the prism 3 b and the photosensor 5 through the touch surface of the touch panel 4.
- the infrared light for detection emitted from the infrared light source 2 is diffused and radiated in parallel to the touch panel surface by the prism 3a, and the opposing prism 3b receives the infrared light for detection radiated through the prism 3a. Then, the light is condensed on the photosensor 5.
- the infrared light source 2 an infrared LED or the like can be given.
- the photosensor 5 is a sensor that receives the infrared light for detection collected by the prism 3b and outputs an electrical signal corresponding to the intensity of the infrared light for detection to the control unit 7.
- the touch panel 4 is configured to include a detection electrode on the touch panel surface side and a drive electrode arranged to face the detection electrode via a glass substrate, and a capacitance is formed between the detection electrode and the drive electrode. Then, the touch is detected by utilizing the fact that the electrostatic capacity is changed by the approach or contact of the instruction means.
- the liquid crystal module 6 is disposed on the inner side of the device (opposite the touch surface) to face the touch panel 4, and is configured by laminating a liquid crystal layer, a pixel electrode, and a circuit board for driving the liquid crystal layer. Note that a detection circuit that performs a touch detection operation of the touch panel 4 may be formed on the circuit board of the liquid crystal module 6.
- the control unit 7 is a component that controls the operation of the touch panel device 1, an infrared light emission operation by the infrared light source 2, an operation for determining presence / absence of an instruction unit based on a result of infrared light reception by the photosensor 5, The touch input operation of the touch panel 4 by the capacitive method is controlled.
- FIG. 3 is a flowchart showing a flow of operations performed by the touch panel device according to the first embodiment, and shows operations in a previous stage in which a touch input position is detected by a capacitance method.
- the control unit 7 controls the infrared light source 2 to continuously emit infrared light with a constant intensity.
- the infrared light for detection emitted from the infrared light source 2 is diffused and radiated in parallel to the touch surface of the touch panel 4 via the prism 3a.
- the infrared light for detection functions as a probe for detecting the pointing means on the touch surface.
- Infrared light for detection is received by the prism 3 b disposed opposite to the prism 3 a and is condensed on the photosensor 5.
- the photosensor 5 Upon receiving the detection infrared light, the photosensor 5 outputs an electrical signal corresponding to the intensity of the detection infrared light to the control unit 7.
- the control unit 7 is preset with a predetermined electric signal value (decision threshold value for the presence or absence of shielding) corresponding to the intensity of infrared light for detection when the photosensor 5 receives light without being shielded on the touch surface.
- a predetermined electric signal value determination threshold value for the presence or absence of shielding
- step ST1; NO there is no instruction means for pressing the touch panel 4 on the touch surface.
- the process returns to step ST1, and the touch input waiting state is continued.
- step ST1 when the output value of the photosensor 5 is less than a predetermined electric signal value (step ST1; YES), the instruction unit for pressing the touch panel 4 is present on the touch surface.
- step ST2 When a change in electrostatic capacitance is detected at 4, the touch position is detected based on the detection result (step ST2).
- the touch position detection operation is the same as that described with reference to FIG.
- the touch position detection by the capacitive method of the touch panel 4 is executed when the shielding of the infrared light irradiated on the touch surface is detected. Even if the detection capacitance threshold is lowered to increase the sensitivity to the capacitance change, the touch position detection is not performed unless the infrared light irradiated on the touch surface is shielded by the pointing means. It is difficult to be affected by noise, moisture due to condensation on the touch surface, and the occurrence of malfunction can be suppressed.
- an infrared light sensor or a photosensor corresponding to the touch input resolution is not required, and it can be configured by at least one pair of infrared light source 2 and photosensor 5. Note that the configuration according to the first embodiment does not affect the multipoint input, which is a feature of the capacitive touch panel 4.
- FIG. FIG. 4 is a diagram showing a configuration of a touch panel device according to Embodiment 2 of the present invention.
- the touch panel device 1 ⁇ / b> A according to Embodiment 2 includes a movable glass 8, a movable glass side transparent electrode 9 a, a fixed glass side transparent electrode 9 b, a touch panel 4, a liquid crystal module 6, and a control unit 7.
- the touch panel 4 is configured to include a detection electrode on the touch surface side and a drive electrode disposed so as to face the detection electrode with a glass substrate interposed between the detection electrode and the drive electrode.
- Capacitance is formed between them, and a touch is detected by utilizing the fact that this capacitance changes as the pointing means approaches or touches.
- the touch panel 4 is fixedly disposed on the liquid crystal module 6 as a fixed glass.
- the liquid crystal module 6 is disposed on the device inner side (opposite the touch surface) to face the touch panel 4 and is configured by laminating a liquid crystal layer, a pixel electrode, and a circuit board for driving the liquid crystal layer.
- the movable glass 8 is provided with a predetermined space between the touch panel 4 and is formed of a thin glass plate that is bent when pressed by an instruction unit.
- a movable glass side transparent electrode 9a serving as a resistance film is formed on the surface of the movable glass 8 on the touch panel 4 side, while the movable glass side transparent electrode 9a of the touch panel 4 is opposed to the movable glass side transparent electrode 9a.
- a fixed glass side transparent electrode 9b is provided.
- a predetermined voltage is applied to the movable glass side transparent electrode 9a by the control unit 7, and the voltage change of the fixed glass side transparent electrode 9b when the movable glass side transparent electrode 9a contacts the fixed glass side transparent electrode 9b.
- the touch by the instruction means is detected by using this.
- the control unit 7 is a component that controls the operation of the touch panel device 1A.
- the control unit 7 applies a voltage to the movable glass side transparent electrode 9a, determines whether or not there is an instruction unit based on a voltage change of the fixed glass side transparent electrode 9b, and the touch panel 4.
- the touch input operation is controlled by the electrostatic capacity method.
- FIG. 5 is a flowchart showing a flow of operations performed by the touch panel device according to the second embodiment, and shows operations performed before the touch input position is detected by the capacitance method.
- the control unit 7 applies a predetermined voltage to the movable glass side transparent electrode 9a, and from the contact between the movable glass side transparent electrode 9a and the fixed glass side transparent electrode 9b by pressing the movable glass 8, the fixed glass side It is determined whether or not the voltage of the transparent electrode 9b is equal to or higher than a predetermined value (step ST1a).
- step ST1a if the voltage of the fixed glass side transparent electrode 9b is less than the predetermined value (step ST1a; NO), it is determined that the touch surface is not pressed down by the instruction means, so that the control unit 7 thereafter performs a static operation on the touch panel 4. Regardless of whether or not the capacitance changes, the process returns to step ST1a to continue the touch input waiting state.
- step ST1a when the voltage of the fixed glass side transparent electrode 9b becomes equal to or higher than a predetermined value (step ST1a; YES), it is determined that the instruction unit depresses the touch surface.
- the touch position is detected based on the detection result (step ST2a).
- the touch position detection operation is the same as that described with reference to FIG. 1 in the first embodiment.
- the movable glass 8 is pressed down from the voltage change of the fixed glass side transparent electrode 9b due to the contact between the movable glass side transparent electrode 9a and the fixed glass side transparent electrode 9b.
- the touch position detection of the touch panel 4 by the capacitive method is executed with this as an opportunity.
- the resistive film type touch panel unlike the conventional resistive film type touch panel, it is not necessary to alternately detect the voltage of each electrode of the resistive film in which the electrode is formed in the X-axis direction and the resistive film in which the electrode is formed in the Y-axis direction. It can be configured only by voltage monitoring of the electrode (fixed glass side transparent electrode 9b). The configuration according to the second embodiment does not affect the multi-point input that is a feature of the capacitive touch panel 4.
- the control unit 7 does not perform touch position detection from the beginning using the high-sensitivity threshold B shown in FIG. A larger low sensitivity threshold A is set, and when the detection infrared light shielding or resistance film contact is detected, the threshold is gradually lowered from the threshold A to detect the touch position by the capacitive method. You may make it perform. By doing so, touch position detection with higher sensitivity than necessary is not performed, and resistance to ambient environmental noise can be improved.
- the control unit 7 when the control unit 7 does not detect the detection infrared light shielding or the contact of the resistance film, that is, when the instruction unit does not exist on the touch surface, By observing changes in the detected capacity caused by the influence of ambient noise, etc., the upper limit value of the threshold that determines this detected capacity change as a touch input was determined, and a small predetermined amount was added to this upper limit value.
- the threshold value is used for touch position detection when detection infrared light shielding or resistance film contact is detected. Even in this way, touch position detection with higher sensitivity than necessary is not performed, and resistance to ambient environmental noise can be improved.
- the touch panel device according to the present invention is less susceptible to ambient noise and the like, and can suppress the occurrence of malfunctions, and thus is suitable for an input device of a vehicle-mounted device having a large fluctuation in the surrounding environment.
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Abstract
Description
また、特許文献2及び特許文献3記載の装置は、対向基板を静電容量方式のタッチパネル装置として利用するものであるが、指示手段の種類に応じた検知容量の変化による影響を十分に考慮していない。このため、素手の指に比べて検知容量が低くなる手袋を装着した手の指や爪を指示手段とする場合には、検知感度を上げなければならず、静電気のスパーク等の周囲のノイズや、タッチ面の結露による水分等の影響を受けて誤作動する可能性が高くなるという課題があった。
実施の形態1.
静電容量方式のタッチパネル装置では、指示手段によるタッチ面上の押下位置における検知容量によってタッチ位置を特定している。
図1は、静電容量方式のタッチパネル装置におけるタッチ面上の押下位置と検知容量との関係を示すグラフである。図1に示すように、タッチ入力は、検知容量が所定の閾値を超えたか否かにより検知される。検知容量は、指示手段の種類に大きく影響される特性を有しており、通常、素手の指によるタッチ入力で生じる容量特性A1を想定して閾値Aが設定されている。
一方、近年では、容量変化を与えにくい手袋が装着されている場合や爪を用いたタッチ操作を検知できることが望まれている。この場合、容量特性A1より検知容量が小さい容量特性A2となるため、タッチ位置判定用の閾値は、閾値Aより小さい閾値Bを設定する必要がある。
しかしながら、閾値Bを設定すると、容量変化に対する感度が上がることになるため、静電気のスパーク等の周囲のノイズによる容量変化や、タッチ面の結露で発生した水滴による容量変化等の影響を受けて誤作動する可能性が高くなる。
図3は、実施の形態1のタッチパネル装置による動作の流れを示すフローチャートであり、タッチ入力位置を静電容量方式で検出する前段階の動作を示している。
先ず、制御部7は、赤外光源2を制御して一定の強度で赤外光を連続して発光させる。赤外光源2から発光された検知用赤外光は、プリズム3aを介してタッチパネル4のタッチ面に平行に拡散して放射される。これにより、検知用赤外光が、タッチ面上の指示手段を検知するプローブとして機能する。検知用赤外光は、プリズム3aに対向配置されたプリズム3bに受光されフォトセンサ5へ集光される。フォトセンサ5は、検知用赤外光を受光すると、当該検知用赤外光の強度に応じた電気信号を制御部7へ出力する。
また、従来の赤外線タッチセンサと異なって、タッチ入力分解能に相当する赤外光センサやフォトセンサが必要なく、少なくとも1対の赤外光源2とフォトセンサ5で構成可能である。なお、この実施の形態1による構成は、静電容量方式のタッチパネル4の特徴である複数点入力には影響しない。
図4は、この発明の実施の形態2によるタッチパネル装置の構成を示す図である。図4に示すように、実施の形態2によるタッチパネル装置1Aは、可動ガラス8、可動ガラス側透明電極9a、固定ガラス側透明電極9b、タッチパネル4、液晶モジュール6及び制御部7を備える。タッチパネル4は、実施の形態1と同様に、タッチ面側の検出電極と、この検出電極とガラス基板を介して対向配置された駆動電極を有して構成され、この検出電極と駆動電極との間に静電容量が形成され、この静電容量が指示手段の接近又は接触で変化することを利用してタッチが検出される。タッチパネル4は、固定ガラスとして、液晶モジュール6に固定的に配置される。液晶モジュール6は、装置内部側(タッチ面の反対側)に、タッチパネル4と対向して配置されており、液晶層、画素電極及びこれを駆動する回路基板を積層して構成される。
可動ガラス側透明電極9aには、制御部7によって所定の電圧が印加されており、可動ガラス側透明電極9aが固定ガラス側透明電極9bに接触した際における固定ガラス側透明電極9bの電圧変化を利用して、指示手段によるタッチが検出される。
制御部7は、タッチパネル装置1Aの動作を制御する構成部であり、可動ガラス側透明電極9aへの電圧印加、固定ガラス側透明電極9bの電圧変化に基づく指示手段の有無の判定動作、タッチパネル4の静電容量方式によるタッチ入力動作の制御を行う。
図5は、実施の形態2のタッチパネル装置による動作の流れを示すフローチャートであり、タッチ入力位置を静電容量方式で検出する前段階の動作を示している。
先ず、制御部7は、可動ガラス側透明電極9aへ所定の電圧を印加しておき、可動ガラス8の押下による可動ガラス側透明電極9aと固定ガラス側透明電極9bとの接触から、固定ガラス側透明電極9bの電圧が所定値以上になったか否かを判定する(ステップST1a)。ここで、固定ガラス側透明電極9bの電圧が所定値未満であれば(ステップST1a;NO)、指示手段によりタッチ面が押下されないと判断されるので、制御部7は、この後にタッチパネル4において静電容量が変化するか否かに関わらず、ステップST1aの処理に戻って、タッチ入力待ち状態を継続する。
また、従来の抵抗膜方式のタッチパネルのように、X軸方向に電極を形成した抵抗膜とY軸方向に電極を形成した抵抗膜との各電極の電圧を交互に検出する必要がなく、片側の電極(固定ガラス側透明電極9b)の電圧監視のみで構成可能である。
なお、この実施の形態2による構成は、静電容量方式のタッチパネル4の特徴である複数点入力には影響しない。
Claims (2)
- 静電容量方式のタッチパネルと、
前記タッチパネルのタッチ面上に照射したプローブ光を受光してその受光強度から前記プローブ光の遮蔽の有無を検出する検出部と、
前記プローブ光の遮蔽が前記検出部に検出されたことを契機として、前記タッチパネルの静電容量方式によるタッチ位置検出を実行する制御部とを備えたタッチパネル装置。 - 静電容量方式のタッチパネルと、
前記タッチパネルのタッチ面上に設けられ、所定の間隔を空けて配置した一対の透明基板と、前記透明基板の対向面にそれぞれ形成した透明電極を有し、前記透明電極の一方に所定の電圧を印加して、前記透明電極間の接触による前記透明電極の他方の電圧変化から前記透明基板の押下を検出する検出部と、
前記透明基板の押下が前記検出部に検出されたことを契機として、前記タッチパネルの静電容量方式によるタッチ位置検出を実行する制御部とを備えたタッチパネル装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2010/000991 WO2011101894A1 (ja) | 2010-02-17 | 2010-02-17 | タッチパネル装置 |
CN201080060308.5A CN102741791B (zh) | 2010-02-17 | 2010-02-17 | 触摸屏装置 |
JP2012500377A JP5335130B2 (ja) | 2010-02-17 | 2010-02-17 | タッチパネル装置 |
US13/502,035 US20120200531A1 (en) | 2010-02-17 | 2010-02-17 | Touch panel device |
DE112010005275.1T DE112010005275B4 (de) | 2010-02-17 | 2010-02-17 | Berührungsfeld-Vorrichtung |
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PCT/JP2010/000991 WO2011101894A1 (ja) | 2010-02-17 | 2010-02-17 | タッチパネル装置 |
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JP (1) | JP5335130B2 (ja) |
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- 2010-02-17 WO PCT/JP2010/000991 patent/WO2011101894A1/ja active Application Filing
- 2010-02-17 DE DE112010005275.1T patent/DE112010005275B4/de active Active
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DE112010005275T5 (de) | 2013-02-07 |
CN102741791A (zh) | 2012-10-17 |
CN102741791B (zh) | 2016-01-13 |
JP5335130B2 (ja) | 2013-11-06 |
DE112010005275B4 (de) | 2018-10-25 |
JPWO2011101894A1 (ja) | 2013-06-17 |
US20120200531A1 (en) | 2012-08-09 |
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