JPH0535408B2 - - Google Patents

Info

Publication number
JPH0535408B2
JPH0535408B2 JP59274830A JP27483084A JPH0535408B2 JP H0535408 B2 JPH0535408 B2 JP H0535408B2 JP 59274830 A JP59274830 A JP 59274830A JP 27483084 A JP27483084 A JP 27483084A JP H0535408 B2 JPH0535408 B2 JP H0535408B2
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
display device
circuit
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP59274830A
Other languages
Japanese (ja)
Other versions
JPS61156107A (en
Inventor
Juji Inoe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP59274830A priority Critical patent/JPS61156107A/en
Publication of JPS61156107A publication Critical patent/JPS61156107A/en
Publication of JPH0535408B2 publication Critical patent/JPH0535408B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、液晶表示パネルに特に手を加えるこ
となく、外部回路に駆動用回路と容量検出用回路
とを用意し、適当に切替えて走査することで該パ
ネル上を押圧した位置を検出する機能をもたせた
液晶表示装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a drive circuit and a capacitance detection circuit in an external circuit, and switches them appropriately to perform scanning without making any special modifications to the liquid crystal display panel. The present invention relates to a liquid crystal display device having a function of detecting a pressed position on the panel.

［従来の技術］及び ［発明が解決しようとする問題点］ 表示部を直接押圧することで位置検出する方法
としてCRTなどでは(1)ライトペンを用いる方法
や、(2)管面に透明導電膜をマトリクス状に配置し
た２枚の透明フイルムを一定間隙に保ち、押圧箇
所の上下間シヨートを利用する方法などがある
が、液晶表示パネルに対しては、(1)の方法は表示
原理や駆動方法が異なるため使用できない。又、
(2)の方法は、表示パネル外に機械的接点による位
置検出パネルを設けるため部品点数の増大に伴う
コスト高という問題があつた。又、別の位置検出
法として、(3)表示パネル外前面に第７図に示す透
明電極スイツチパネルを重ねた容量検出型のもの
があるが、この方法も表示パネル外部品（パネ
ル）を用いるため、コスト高である。さらに、(4)
液晶セル自身の容量変化を用いる方法が提案され
ている。英国アールエスアールイー、エレクトロ
ニクス レタース（英国RSRE，Electronics
Letters）1982年、12月９日、P.1106〜1108，No.
25／26，vol.18号。[Prior art] and [Problems to be solved by the invention] In CRTs, etc., there are two methods for detecting the position by directly pressing the display: (1) using a light pen, and (2) using a transparent conductive material on the tube surface. There is a method in which two transparent films arranged in a matrix are kept at a constant gap and a shot is used between the top and bottom of the pressed area, but for liquid crystal display panels, method (1) is based on the display principle and Cannot be used because the drive method is different. or,
Method (2) has the problem of high cost due to an increase in the number of parts because a position detection panel using mechanical contacts is provided outside the display panel. In addition, as another position detection method, there is (3) a capacitive detection type in which a transparent electrode switch panel shown in Fig. 7 is stacked on the outside front of the display panel, but this method also uses parts (panels) outside the display panel. Therefore, the cost is high. Furthermore, (4)
A method has been proposed that uses changes in the capacitance of the liquid crystal cell itself. UK RSRE, Electronics Letters (UK RSRE, Electronics)
Letters) December 9, 1982, P.1106-1108, No.
25/26, vol.18.

しかしながら、第８図から明らかな様に電極パ
ターンを工夫してブリツジ回路を構成しなくては
ならず、単純ドツトマトリクスパターンによる液
晶表示パネルは用いることが出来なかつた。 However, as is clear from FIG. 8, the bridge circuit had to be constructed by devising the electrode pattern, and a liquid crystal display panel with a simple dot matrix pattern could not be used.

本発明は、上記従来技術の問題点に鑑みなされ
たもので、液晶表示パネルには特に手を加えるこ
となく単純ドツトマトリクスパネルデイスプレイ
に位置検出機能を付加させることを目的としたも
のである。 The present invention has been made in view of the problems of the prior art described above, and is intended to add a position detection function to a simple dot matrix panel display without making any special modifications to the liquid crystal display panel.

［問題点を解決するための手段］及び［作用］ 第１図は、液晶表示パネルの一画素の等価回路
と容量検出用積分回路を表わす。[Means for solving the problem] and [Operation] FIG. 1 shows an equivalent circuit of one pixel of a liquid crystal display panel and an integrating circuit for detecting capacitance.

第２図は第１図のVioの信号とＡ点を流れる電
流、及びリセツトパルスとVputの関係を表わす。 FIG. 2 shows the relationship between the V io signal in FIG. 1, the current flowing through point A, and the reset pulse and V put .

第１図においてCLC（液晶セル容量分）を移動し
た電荷量をQ1とし、RLC（液晶セル抵抗分）を移
動した電荷量をQ2とすると△ｔにＡ点を通る全
電荷量Qト哀織襪 In Figure 1, if the amount of charge transferred by C LC (liquid crystal cell capacity) is Q 1 , and the amount of charge transferred by R LC (liquid crystal cell resistance) is Q 2 , then the total amount of charge passing through point A at △t is Q

Claims (1)

【特許請求の範囲】 １ 二枚の基板間に液晶物質を封入して成る液晶
表示装置において、表示パネル外に上下基板間液
晶を移動した電荷量を検出するための回路と、表
示駆動用回路とを設け、順次切替走査することを
特徴とする液晶表示装置。 ２ 上記電荷量検出回路に、積分器を用いること
を特徴とする特許請求の範囲第１項記載の液晶表
示装置。 ３ 上下基板上電極をマトリクス状に配置した上
下基板間に、液晶をTN配向させ、走査電極信号
に矩形波を用い、データ表示の際にはデータ線側
電極に表示用駆動回路からの信号を用い、電荷量
検出時には走査線の１本を積分回路に接続し、他
をハイインピーダンス状態にし、データ線の１本
にテスト用矩形波信号を印加し、他をハイインピ
ーダンスとし一水平走査期間内に順次走査するこ
とを特徴とする特許請求の範囲第１項記載の液晶
表示装置。 ４ 積分回路には水平走査期間内に少なくとも１
回はリセツトがかかる機能を有する特許請求の範
囲第３項記載の液晶表示装置。 ５ テスト用信号に走査線信号を兼用したことを
特徴とする特許請求の範囲第３項記載の液晶表示
装置。[Scope of Claims] 1. In a liquid crystal display device in which a liquid crystal substance is sealed between two substrates, a circuit for detecting the amount of charge transferred to the liquid crystal between the upper and lower substrates outside the display panel, and a display driving circuit. What is claimed is: 1. A liquid crystal display device comprising: 2. The liquid crystal display device according to claim 1, wherein an integrator is used in the charge amount detection circuit. 3. The liquid crystal is TN-aligned between the upper and lower substrates where the electrodes are arranged in a matrix, a rectangular wave is used for the scanning electrode signal, and when data is displayed, the signal from the display drive circuit is sent to the data line side electrode. When detecting the amount of charge, one of the scanning lines is connected to an integrating circuit, the others are set to a high impedance state, a test rectangular wave signal is applied to one of the data lines, and the others are set to high impedance within one horizontal scanning period. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device sequentially scans. 4 The integrator circuit has at least one
4. The liquid crystal display device according to claim 3, which has a function of being reset once. 5. The liquid crystal display device according to claim 3, wherein a scanning line signal is also used as a test signal.
JP59274830A 1984-12-28 1984-12-28 Liquid crystal display device Granted JPS61156107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59274830A JPS61156107A (en) 1984-12-28 1984-12-28 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59274830A JPS61156107A (en) 1984-12-28 1984-12-28 Liquid crystal display device

Publications (2)

Publication Number Publication Date
JPS61156107A JPS61156107A (en) 1986-07-15
JPH0535408B2 true JPH0535408B2 (en) 1993-05-26

Family

ID=17547164

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59274830A Granted JPS61156107A (en) 1984-12-28 1984-12-28 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPS61156107A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5777596A (en) * 1995-11-13 1998-07-07 Symbios, Inc. Touch sensitive flat panel display
GB0229236D0 (en) * 2002-12-12 2003-01-22 Koninkl Philips Electronics Nv AMLCD with integrated touch input
JP5850350B2 (en) * 2014-09-04 2016-02-03 Ｎｌｔテクノロジー株式会社 Surface display device and electronic device

Also Published As

Publication number Publication date
JPS61156107A (en) 1986-07-15

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