JP2009211531A - Display device - Google Patents

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JP2009211531A
JP2009211531A JP2008055285A JP2008055285A JP2009211531A JP 2009211531 A JP2009211531 A JP 2009211531A JP 2008055285 A JP2008055285 A JP 2008055285A JP 2008055285 A JP2008055285 A JP 2008055285A JP 2009211531 A JP2009211531 A JP 2009211531A
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display device
layer
detection
liquid crystal
electrode
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Takayuki Imai
貴之 今井
Taku Nakamura
卓 中村
Hiroyoshi Hayashi
宏宜 林
Masayoshi Fuchi
正芳 淵
Masahiro Tada
正浩 多田
Hiroyoshi Nakamura
弘喜 中村
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Japan Display Central Inc
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Toshiba Mobile Display Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitive thin and lightweight display device having a contact coordinate detection function. <P>SOLUTION: An X detection electrode layer 21 and a Y detection electrode layer 23 with detection electrodes for detecting capacitance arranged therein are integrated into a BM layer 20. Thus, it is not required to mount a touch panel part on a liquid crystal display device, so that the liquid crystal display device is made thin and lightweight. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、静電容量式座標検知機能を備えた表示装置に関する。   The present invention relates to a display device having a capacitive coordinate detection function.

タッチパネルは、表示装置と一体化して構成され、表示装置の画面に指先などの物体が接触した接触座標を検出する入力装置である。タッチパネルには種々の方式があり、その動作方式の１つとして静電容量方式が知られている（例えば、特許文献１参照）。静電容量方式のタッチパネルは、利用者が画面上をタッチしたときに形成される静電容量を検出することで接触座標を算出する。   The touch panel is an input device that is configured to be integrated with a display device and detects contact coordinates at which an object such as a fingertip contacts the screen of the display device. There are various types of touch panels, and an electrostatic capacity method is known as one of the operation methods (see, for example, Patent Document 1). The capacitive touch panel calculates the contact coordinates by detecting the capacitance formed when the user touches the screen.

図６は、従来の静電容量方式のタッチパネルを載せた液晶表示装置の構成を示す断面図である。同図に示す液晶表示装置は、液晶表示装置１００とタッチパネル部２００とを粘着層２０５により接合したものである。   FIG. 6 is a cross-sectional view illustrating a configuration of a liquid crystal display device on which a conventional capacitive touch panel is mounted. The liquid crystal display device shown in the figure is obtained by bonding the liquid crystal display device 100 and the touch panel unit 200 with an adhesive layer 205.

液晶表示装置１００は、液晶層１０６をガラス製のアレイ基板１０８と対向基板１０２とで挟んだ構成である。アレイ基板１０８上には、複数の信号線、走査線がマトリクス状に配線され、各交差部にスイチッング素子が配置される。そのスイッチング素子のそれぞれに画素電極１０７が接続される。対向基板１０２上には、ＢＭ層１０３、カラーフィルタ層１０４および対向電極１０５が形成される。カラーフィルタ層１０４は、画素毎に赤、緑、青で着色される。ＢＭ層１０３は、光を遮光するように黒色樹脂あるいはクロムなどの金属で形成され、各画素を区分けするように配置される。ＢＭ層１０３とカラーフィルタ層１０４を合わせてカラーフィルタと呼ぶ。カラーフィルタの上には、対向基板１０２の全面に対向電極１０５が形成される。対向基板１０２とアレイ基板１０８の外側には、偏光板１０１，１０９がそれぞれ配置される。   The liquid crystal display device 100 has a configuration in which a liquid crystal layer 106 is sandwiched between a glass array substrate 108 and a counter substrate 102. On the array substrate 108, a plurality of signal lines and scanning lines are wired in a matrix, and a switching element is disposed at each intersection. A pixel electrode 107 is connected to each of the switching elements. On the counter substrate 102, a BM layer 103, a color filter layer 104, and a counter electrode 105 are formed. The color filter layer 104 is colored red, green, and blue for each pixel. The BM layer 103 is made of a black resin or a metal such as chromium so as to block light, and is arranged so as to partition each pixel. The BM layer 103 and the color filter layer 104 are collectively referred to as a color filter. A counter electrode 105 is formed on the entire surface of the counter substrate 102 on the color filter. Polarizing plates 101 and 109 are disposed outside the counter substrate 102 and the array substrate 108, respectively.

一方、タッチパネル部２００は、ガラス基板２０１上に静電容量を検知するための透明電極２０２，２０４を形成したものである。透明電極２０２は、接触座標のＸ軸（横）方向の静電容量を検出し、透明電極２０４は、接触座標のＹ軸（縦）方向の静電容量を検出する。透明電極２０２，２０４の間には絶縁膜２０３が形成される。
特開２００７−３０４３４２号公報 On the other hand, the touch panel unit 200 is formed by forming transparent electrodes 202 and 204 for detecting electrostatic capacity on a glass substrate 201. The transparent electrode 202 detects a capacitance in the X-axis (lateral) direction of the contact coordinates, and the transparent electrode 204 detects a capacitance in the Y-axis (vertical) direction of the contact coordinates. An insulating film 203 is formed between the transparent electrodes 202 and 204.
JP 2007-304342 A

しかしながら、従来の液晶表示装置１００にタッチパネル部２００を載せる構成では表示装置全体の厚みが増すという問題がある。なお、特許文献１では対向電極を静電容量検出用の電極として共用することにより薄型軽量化を図っている。   However, the configuration in which the touch panel unit 200 is mounted on the conventional liquid crystal display device 100 has a problem that the thickness of the entire display device increases. In Patent Document 1, the counter electrode is commonly used as an electrode for detecting capacitance, thereby reducing the thickness and weight.

本発明は、上記に鑑みてなされたものであり、その課題とするところは、静電容量方式の座標検知機能を備えた液晶表示装置の薄型軽量化を図ることにある。   The present invention has been made in view of the above, and an object of the present invention is to reduce the thickness and weight of a liquid crystal display device having a capacitive coordinate detection function.

本発明に係る表示装置は、各画素を囲む遮光層を配置した対向基板を備え、対向基板に誘電体が接触したときに形成される静電容量を検出することにより誘電体の接触座標を算出する機能を有する表示装置であって、静電容量を検知するための検知用電極を遮光層に一体化したことを特徴とする。   The display device according to the present invention includes a counter substrate having a light shielding layer surrounding each pixel, and calculates a contact coordinate of the dielectric by detecting a capacitance formed when the dielectric contacts the counter substrate. A display device having a function of detecting a capacitance, wherein a detection electrode for detecting capacitance is integrated with a light shielding layer.

本発明にあっては、静電容量を検知するための検知用電極を対向基板の遮光層に一体化することにより、接触座標検知機能を備えた表示装置の薄型軽量化を図ることが可能となる。   In the present invention, it is possible to reduce the thickness and weight of a display device having a contact coordinate detection function by integrating a detection electrode for detecting capacitance with a light shielding layer of a counter substrate. Become.

上記表示装置において、検知用電極は絶縁層を挟んで互いに直交する複数の検知用電極であって、検知用電極のそれぞれに格子状の節を有することを特徴とする。   In the above display device, the detection electrode is a plurality of detection electrodes orthogonal to each other with an insulating layer interposed therebetween, and each of the detection electrodes has a grid-like node.

本発明にあっては、検知用電極に画素を囲む格子状の節を備えることにより、画素の開口部を遮ることなく、指などの誘電体との静電容量結合を容易とする。   In the present invention, by providing the detection electrode with a grid-like node surrounding the pixel, electrostatic coupling with a dielectric such as a finger is facilitated without blocking the opening of the pixel.

本発明によれば、静電容量方式の座標検知機能を備えた液晶表示装置の薄型軽量化を図ることができる。   According to the present invention, it is possible to reduce the thickness and weight of a liquid crystal display device having a capacitive coordinate detection function.

以下、本発明の実施の形態について図面を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本実施の形態における液晶表示装置の構成を示す断面図である。同図に示す液晶表示装置は、指などの誘電体が表示画面に接触した接触座標を算出する機能を備えたものであり、液晶層１５をガラス製のアレイ基板１７と対向基板１２とで挟んだ構成である。   FIG. 1 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to the present embodiment. The liquid crystal display device shown in the figure has a function of calculating contact coordinates where a dielectric such as a finger contacts the display screen, and the liquid crystal layer 15 is sandwiched between the glass array substrate 17 and the counter substrate 12. It is a configuration.

アレイ基板１７上には、複数の信号線（図示せず）と複数の走査線（図示せず）がマトリクス状に配線され、各交差部にスイッチング素子（図示せず）が配置される。そのスイッチング素子のそれぞれに画素電極１６が接続される。   On the array substrate 17, a plurality of signal lines (not shown) and a plurality of scanning lines (not shown) are wired in a matrix, and switching elements (not shown) are arranged at each intersection. A pixel electrode 16 is connected to each of the switching elements.

対向基板１２上には、ＢＭ（Black Matrix）層２０、カラーフィルタ層１３および対向電極１４が形成される。ＢＭ層２０は、Ｘ検知電極層２１、絶縁層２２、Ｙ検知電極層２３および樹脂層２４の４層で構成される。Ｘ検知電極層２１およびＹ検知電極層２３には、Ｘ，Ｙ検知電極を配置する。このＸ，Ｙ検知電極と表示画面に接触した指との間に形成される静電容量を検知することにより、指の接触位置を算出する。Ｘ，Ｙ検知電極の配置については後述する。樹脂層２４は、黒色樹脂などの絶縁体で形成され、各画素を囲んで区分けしている。図２に示すように、カラーフィルタ層１３を画素毎に赤、緑、青で着色してカラー表示を行う。ＢＭ層２０は、各画素１３Ｒ，１３Ｇ，１３Ｂを区分けするように配置される。   On the counter substrate 12, a BM (Black Matrix) layer 20, a color filter layer 13, and a counter electrode 14 are formed. The BM layer 20 includes four layers of an X detection electrode layer 21, an insulating layer 22, a Y detection electrode layer 23, and a resin layer 24. X and Y detection electrodes are disposed on the X detection electrode layer 21 and the Y detection electrode layer 23. The contact position of the finger is calculated by detecting the capacitance formed between the X and Y detection electrodes and the finger in contact with the display screen. The arrangement of the X and Y detection electrodes will be described later. The resin layer 24 is formed of an insulator such as a black resin and surrounds each pixel. As shown in FIG. 2, the color filter layer 13 is colored with red, green, and blue for each pixel to perform color display. The BM layer 20 is disposed so as to partition the pixels 13R, 13G, and 13B.

偏光板１１，１８は、対向基板１２とアレイ基板１７の外側に、それぞれの偏光方向が互いに直交するように配置される。信号線に印加された映像信号は、走査線の走査信号によりスイッチング素子がオンしたときに画素電極１６に書き込まれる。画素電極１６と対向電極１４との間の電界により液晶層１５を通過する光を制御し、カラーフィルタ層１３で着色して画像を出力する。   The polarizing plates 11 and 18 are arranged outside the counter substrate 12 and the array substrate 17 so that their polarization directions are orthogonal to each other. The video signal applied to the signal line is written into the pixel electrode 16 when the switching element is turned on by the scanning signal of the scanning line. The light passing through the liquid crystal layer 15 is controlled by the electric field between the pixel electrode 16 and the counter electrode 14, and the color filter layer 13 is colored to output an image.

次に、ＢＭ層の検知電極の配置について説明する。Ｘ検知電極層２１、Ｙ検知電極層２３には、互いに交差するように複数の検知電極が配置される。検知電極には、ブラックマトリクスとして使用される金属を用いて、ＢＭ層と一体化する。   Next, the arrangement of the BM layer detection electrodes will be described. A plurality of detection electrodes are disposed on the X detection electrode layer 21 and the Y detection electrode layer 23 so as to cross each other. The detection electrode is integrated with the BM layer using a metal used as a black matrix.

図３は、Ｘ検知電極層２１およびＹ検知電極層２３における電極の配置を示す概略図である。同図に示すように、Ｘ検知電極層２１では、指が接触したＸ方向（横方向）の位置を検出するためのＸ検知電極２２Ａ，２２Ｂが縦方向に配置される。一方、Ｙ検知電極層２３では、指が接触したＹ方向（縦方向）の位置を検出するためのＹ検知電極２４Ａ，２４Ｂ，２４Ｃが横方向に配置される。また、Ｘ検知電極２２Ａ，２２Ｂは、交差して配置されたＹ検知電極２４Ａ，２４Ｂ，２４Ｃ間に格子状の節を備える。同様に、Ｙ検知電極２４Ａ，２４Ｂ，２４Ｃも、交差して配置されたＸ検知電極２２Ａ，２２Ｂ間に格子状の節を備える。このように、検知電極に画素を囲む格子状の節を備えることにより、画素の開口部を遮ることなく、検知電極と指との静電容量結合を容易にする。   FIG. 3 is a schematic diagram showing the arrangement of electrodes in the X detection electrode layer 21 and the Y detection electrode layer 23. As shown in the figure, in the X detection electrode layer 21, X detection electrodes 22 </ b> A and 22 </ b> B for detecting the position in the X direction (lateral direction) where the finger contacts are arranged in the vertical direction. On the other hand, in the Y detection electrode layer 23, Y detection electrodes 24A, 24B, and 24C for detecting the position in the Y direction (vertical direction) where the finger contacts are arranged in the horizontal direction. In addition, the X detection electrodes 22A and 22B include lattice-like nodes between the Y detection electrodes 24A, 24B, and 24C that are arranged to intersect each other. Similarly, the Y detection electrodes 24A, 24B, and 24C also include grid-like nodes between the X detection electrodes 22A and 22B that are arranged to cross each other. Thus, by providing the detection electrode with a grid-like node surrounding the pixel, the capacitive coupling between the detection electrode and the finger is facilitated without blocking the opening of the pixel.

Ｘ検知電極２２Ａ，２２ＢおよびＹ検知電極２４Ａ，２４Ｂ，２４Ｃには、検出回路（図示せず）が接続される。検出回路は、Ｘ検知電極２２Ａ，２２ＢおよびＹ検知電極２４Ａ，２４Ｂ，２４Ｃのそれぞれにおける静電容量の変化を検出する。指などの誘電体が表示装置の画面に接触した場合、画面に接触した誘電体と検知電極との間に静電容量が形成される。検出回路は、この静電容量を検出して指の接触した位置を算出する。   A detection circuit (not shown) is connected to the X detection electrodes 22A, 22B and the Y detection electrodes 24A, 24B, 24C. The detection circuit detects a change in capacitance in each of the X detection electrodes 22A and 22B and the Y detection electrodes 24A, 24B, and 24C. When a dielectric such as a finger contacts the screen of the display device, a capacitance is formed between the dielectric that contacts the screen and the detection electrode. The detection circuit detects the capacitance and calculates the position where the finger touches.

図４、図５は、Ｘ検知電極層２１およびＹ検知電極層２３における別の電極の配置を示す概略図である。図４、図５に示す検知電極は、図３に示したものよりも大きな格子状の節を備える。なお、検知電極の構成はここに図示したものに限らない。   4 and 5 are schematic views showing the arrangement of other electrodes in the X detection electrode layer 21 and the Y detection electrode layer 23. FIG. The detection electrodes shown in FIGS. 4 and 5 have grid-like nodes larger than those shown in FIG. The configuration of the detection electrode is not limited to that shown here.

したがって、本実施の形態によれば、静電容量を検出するための検知電極を配置したＸ検知電極層２１、Ｙ検知電極層２３をＢＭ層２０に一体化することにより、タッチパネル部を液晶表示装置に載せる必要がなくなるので、液晶表示装置の薄型軽量化を図ることができる。   Therefore, according to the present embodiment, the X detection electrode layer 21 and the Y detection electrode layer 23 in which the detection electrodes for detecting the capacitance are arranged are integrated with the BM layer 20, whereby the touch panel portion is displayed on the liquid crystal display. Since it is no longer necessary to place it on the device, the liquid crystal display device can be reduced in thickness and weight.

一実施の形態における液晶表示装置の構成を示す断面図である。It is sectional drawing which shows the structure of the liquid crystal display device in one embodiment. 上記液晶表示装置の表示部の一部の画素を示す平面図である。It is a top view which shows a part of pixel of the display part of the said liquid crystal display device. 上記液晶表示装置における検知用電極の配置を示す概略図である。It is the schematic which shows arrangement | positioning of the electrode for a detection in the said liquid crystal display device. 上記液晶表示装置における別の検知用電極の配置を示す概略図である。It is the schematic which shows arrangement | positioning of another electrode for a detection in the said liquid crystal display device. 上記液晶表示装置におけるさらに別の検知用電極の配置を示す概略図である。It is the schematic which shows arrangement | positioning of another detection electrode in the said liquid crystal display device. 従来のタッチパネル機能を備えた液晶表示装置の構成を示す断面図である。It is sectional drawing which shows the structure of the liquid crystal display device provided with the conventional touchscreen function.

符号の説明Explanation of symbols

１１，１８…偏光板
１２…対向基板
１３…カラーフィルタ層
１４…対向電極
１５…液晶層
１６…画素電極
１７…アレイ基板
２０…ＢＭ層
２１…Ｘ検知電極層
２２…絶縁層
２３…Ｙ検知電極層
２４…樹脂層
１００…液晶表示装置
１０１，１０９…偏光板
１０２…対向基板
１０３…ＢＭ層
１０４…カラーフィルタ層
１０５…対向電極
１０６…液晶層
１０７…画素電極
１０８…アレイ基板
２００…タッチパネル部
２０１…ガラス基板
２０２…透明電極
２０２，２０４…透明電極
２０３…絶縁膜
２０４…透明電極
２０５…粘着層 DESCRIPTION OF SYMBOLS 11, 18 ... Polarizing plate 12 ... Counter substrate 13 ... Color filter layer 14 ... Counter electrode 15 ... Liquid crystal layer 16 ... Pixel electrode 17 ... Array substrate 20 ... BM layer 21 ... X detection electrode layer 22 ... Insulating layer 23 ... Y detection electrode Layer 24 ... Resin layer 100 ... Liquid crystal display device 101, 109 ... Polarizing plate 102 ... Counter substrate 103 ... BM layer 104 ... Color filter layer 105 ... Counter electrode 106 ... Liquid crystal layer 107 ... Pixel electrode 108 ... Array substrate 200 ... Touch panel unit 201 ... Glass substrate 202 ... Transparent electrode 202,204 ... Transparent electrode 203 ... Insulating film 204 ... Transparent electrode 205 ... Adhesive layer

Claims (2)

各画素を囲む遮光層を配置した対向基板を備え、前記対向基板に誘電体が接触したときに形成される静電容量を検出することにより前記誘電体の接触座標を算出する機能を有する表示装置であって、
前記静電容量を検知するための検知用電極を前記遮光層に一体化したことを特徴とする表示装置。 A display device comprising a counter substrate having a light shielding layer surrounding each pixel and having a function of calculating a contact coordinate of the dielectric by detecting a capacitance formed when the dielectric contacts the counter substrate Because
A display device, wherein a detection electrode for detecting the capacitance is integrated with the light shielding layer. 前記検知用電極は絶縁層を挟んで互いに直交する複数の検知用電極であって、前記検知用電極のそれぞれに格子状の節を有することを特徴とする請求項１記載の表示装置。   The display device according to claim 1, wherein the detection electrodes are a plurality of detection electrodes orthogonal to each other with an insulating layer in between, and each of the detection electrodes has a grid-like node.
JP2008055285A 2008-03-05 2008-03-05 Display device Pending JP2009211531A (en)

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