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JP2009294903A - Display device - Google Patents

Display device Download PDF

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Publication number
JP2009294903A
JP2009294903A JP2008147823A JP2008147823A JP2009294903A JP 2009294903 A JP2009294903 A JP 2009294903A JP 2008147823 A JP2008147823 A JP 2008147823A JP 2008147823 A JP2008147823 A JP 2008147823A JP 2009294903 A JP2009294903 A JP 2009294903A
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display
scanning signal
signal line
touch panel
period
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JP2009294903A5 (en
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Toshiyuki Suzuki
敏之 鈴木
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Casio Computer Co Ltd
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Casio Computer Co Ltd
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • G06F3/0418Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • G06F3/0418Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04186Touch location disambiguation
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3685Details of drivers for data electrodes
    • G09G3/3688Details of drivers for data electrodes suitable for active matrices only
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00Aspects of interface with display user
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3674Details of drivers for scan electrodes
    • G09G3/3677Details of drivers for scan electrodes suitable for active matrices only

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Position Input By Displaying (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for preventing the erroneous detection of a touch point. <P>SOLUTION: This display device includes: a display element having a plurality of parallel scanning signal lines and data signal lines crossing each scanning signal line formed in a display area; a scanning signal line driving means for time-dividing each frame into a display period Td and a feedback period Tr, and for successively selecting the scanning signal lines in the display period Td, and for stopping the selection of the scanning signal lines in the feedback period Tr; a touch panel arranged in the display area; and a driving means for detecting a touch point to the touch panel in the feedback period Tr, and for stopping the detection of the touch point to the touch panel in the display period Td by driving the touch panel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、タッチパネルを備えた表示装置に関する。   The present invention relates to a display device provided with a touch panel.

従来より、表示素子の表示領域上にタッチパネルを配置した表示装置が知られている。そして、表示素子としては、互いに対向する2枚の基板間に液晶が挟持され、各表示画素にスイッチング素子としてのTFTを備えたアクティブマトリクス型の液晶表示パネルが知られている。このようなアクティブマトリクス型の液晶表示パネルは、液晶表示パネルに形成された走査信号線を順に選択することで、各TFTを順に所定の期間だけオン状態にする走査信号線駆動回路や、走査信号線駆動回路により選択された走査信号線に対応させて表示信号電圧をデータ信号線に供給することで、各表示画素に表示信号電圧を書き込むデータ信号線駆動回路によって駆動される。   Conventionally, a display device in which a touch panel is arranged on a display area of a display element is known. As a display element, an active matrix liquid crystal display panel in which liquid crystal is sandwiched between two substrates facing each other and each display pixel includes a TFT as a switching element is known. In such an active matrix liquid crystal display panel, a scanning signal line driving circuit that sequentially turns on each TFT for a predetermined period by sequentially selecting scanning signal lines formed on the liquid crystal display panel, and a scanning signal By supplying the display signal voltage to the data signal line in correspondence with the scanning signal line selected by the line driving circuit, the data signal line driving circuit for writing the display signal voltage to each display pixel is driven.

また、タッチパネルは、一方の面に透明な抵抗膜を形成した一対のシートが、それぞれの抵抗膜形成面が対向するように所定の間隙をおいて配置され、その外面がタッチされたときに、当該タッチされた側のシートにおけるタッチ位置が撓み変形し局部的に他方のシートの抵抗膜に接触するように構成されている。そして、このようなタッチパネルは、一方のシートの抵抗膜における所定方向の両端間と、他方のシートの抵抗膜における前記所定方向に対して直交する方向の両端間とに、一定値の電圧が交互に印加されるとともに、一方の抵抗膜に電圧が印加されたときの他方の抵抗膜における一端で電圧値と、他方の抵抗膜に電圧が印加されたときの一方の抵抗膜における一端での電圧値とが検出されることにより、タッチ点の座標が検出される(特許文献1)。   Also, the touch panel is a pair of sheets formed with a transparent resistance film on one side, arranged with a predetermined gap so that the respective resistance film formation surfaces face each other, and when the outer surface is touched, The touch position on the sheet on the touched side is bent and deformed so as to locally contact the resistance film of the other sheet. In such a touch panel, a constant voltage is alternately applied between both ends in a predetermined direction of the resistance film of one sheet and between both ends of the resistance film of the other sheet in a direction orthogonal to the predetermined direction. The voltage value at one end of the other resistance film when a voltage is applied to one resistance film, and the voltage at one end of the one resistance film when a voltage is applied to the other resistance film By detecting the value, the coordinates of the touch point are detected (Patent Document 1).

特開2000−163208号公報JP 2000-163208 A

上述したような走査信号線駆動回路は、水平同期信号に同期して各走査信号線を選択する。また、データ信号線駆動回路は、水平同期信号に同期してデータ信号線に供給する表示信号電圧を切り換える。このため、水平同期信号に同期したノイズが発生し、このノイズがタッチパネルに供給される電圧に重畳し、タッチ点の誤検出が発生するという問題があった。   The scanning signal line driving circuit as described above selects each scanning signal line in synchronization with the horizontal synchronizing signal. The data signal line driving circuit switches the display signal voltage supplied to the data signal line in synchronization with the horizontal synchronizing signal. For this reason, noise synchronized with the horizontal synchronization signal is generated, and this noise is superimposed on the voltage supplied to the touch panel, thereby causing a problem of erroneous detection of the touch point.

本発明は、上記の事情に鑑みてなされたもので、タッチ点の誤検出を防止することが可能な表示装置を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a display device capable of preventing erroneous detection of a touch point.

上記の目的を達成するために、請求項1に記載の表示装置は、互いに平行な複数の走査信号線と前記各走査信号線に交差するデータ信号線とが表示領域に形成された表示素子と、各フレームを表示期間と帰線期間とに時分割し、前記表示期間に前記走査信号線を順に選択するとともに、前記帰線期間に前記走査信号線の選択を停止する走査信号線駆動手段と、前記表示領域上に配置されたタッチパネルと、前記タッチパネルを駆動して、前記帰線期間に前記タッチパネルへのタッチ点を検出するとともに、前記表示期間に前記タッチパネルへのタッチ点の検出を停止する駆動手段と、を備えたことを特徴とする。   In order to achieve the above object, the display device according to claim 1 includes a display element in which a plurality of scanning signal lines parallel to each other and a data signal line intersecting each scanning signal line are formed in a display region. Scanning signal line driving means for time-dividing each frame into a display period and a blanking period, sequentially selecting the scanning signal lines during the display period, and stopping selection of the scanning signal lines during the blanking period; The touch panel disposed on the display area and the touch panel are driven to detect a touch point to the touch panel during the blanking period and stop detecting the touch point to the touch panel during the display period. Drive means.

また、請求項2に記載の表示装置は、互いに平行な複数の走査信号線と前記各走査信号線に交差するデータ信号線とが表示領域に形成された表示素子と、各フレームを表示期間と帰線期間とに時分割し、前記表示期間に前記走査信号線を順に選択するとともに、前記帰線期間に前記走査信号線の選択を停止する走査信号線駆動手段と、前記表示領域上に配置されたタッチパネルと、前記タッチパネルを駆動して、前記表示期間に検出された前記タッチパネルへのタッチ情報を省いて、前記タッチパネルへのタッチ点を導出する駆動手段と、を備えたことを特徴とする。   According to a second aspect of the present invention, there is provided a display device including a display element in which a plurality of scanning signal lines parallel to each other and a data signal line intersecting each scanning signal line are formed in a display region, and each frame as a display period. A scanning signal line driving unit that time-divides the signal into a blanking period, sequentially selects the scanning signal line in the display period, and stops selection of the scanning signal line in the blanking period; and disposed on the display region And a drive means for driving the touch panel to omit touch information to the touch panel detected during the display period and deriving a touch point on the touch panel. .

また、請求項3に記載の表示装置は、請求項1または2に記載の表示装置において、前記駆動手段は、前記走査信号線駆動手段から出力される制御信号に基づいて帰線期間を検出することを特徴とする。   According to a third aspect of the present invention, in the display device according to the first or second aspect, the driving unit detects a blanking period based on a control signal output from the scanning signal line driving unit. It is characterized by that.

本発明によれば、タッチ点の誤検出を防止することができる。   According to the present invention, erroneous detection of touch points can be prevented.

以下、本発明を実施するための形態を、図面を参照して説明する。   Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

本発明に係る表示装置1の概略全体構成は図1に示すように、所定の映像がその表示領域に表示される表示素子10と、外部からの操作入力手段になるタッチパネル20と、表示素子10及びタッチパネル20を駆動する駆動回路部30等を備えて構成されている。そして、タッチパネル20は、表示素子10の映像観察側における表示領域上に配置されている。   As shown in FIG. 1, a schematic overall configuration of a display device 1 according to the present invention is a display element 10 on which a predetermined image is displayed in its display area, a touch panel 20 serving as an operation input means from the outside, and a display element 10. And a drive circuit unit 30 for driving the touch panel 20 and the like. The touch panel 20 is disposed on a display area on the video viewing side of the display element 10.

表示素子10は、図2に示すように、対向配置され、シール材11により接着された2枚の基板間12、13に液晶が挟持された構成となっている。この2枚の基板12、13は、一対の偏光素子14、15に挟持されるように配置されている。そして、表示素子10は、その表示領域10aに複数の表示画素が形成されている。即ち、一方の基板12に、行方向に延伸配設された複数の走査信号線(例えばn本の走査信号線)と、列方向に延伸配設された複数のデータ信号線(例えばm本のデータ信号線)とが形成され、走査信号線とデータ信号線との各交点近傍に図3に示す表示画素が設けられて構成されている。ここで図3は、表示素子10に設けられる複数の表示画素の内の1つの表示画素に対応する等価回路を示す図である。   As shown in FIG. 2, the display element 10 has a configuration in which liquid crystal is sandwiched between two substrates 12 and 13 that are arranged to face each other and bonded together by a sealing material 11. The two substrates 12 and 13 are arranged so as to be sandwiched between the pair of polarizing elements 14 and 15. The display element 10 has a plurality of display pixels in the display region 10a. That is, a plurality of scanning signal lines (for example, n scanning signal lines) extended in the row direction and a plurality of data signal lines (for example, m lines) extended in the column direction on one substrate 12. 3 is provided, and display pixels shown in FIG. 3 are provided in the vicinity of the intersections of the scanning signal lines and the data signal lines. Here, FIG. 3 is a diagram showing an equivalent circuit corresponding to one display pixel among a plurality of display pixels provided in the display element 10.

図3に示す走査信号線G(j)には薄膜トランジスタ(TFT)111のゲート電極が接続され、データ信号線S(i)にはTFT111のソース電極が接続されている。更に、TFT111のドレイン電極には画素電極16が接続されている。そして、画素電極16と対向するように、他方の基板13に共通電極17が配され、画素電極16と共通電極17との間に液晶LCが充填されている。さらに、このようにして構成される液晶容量Clcdと並列になるように蓄積容量Ccsが接続されている。このような構成において、画素電極16と共通電極17との間に電圧が印加されると、この電圧に応じて画素電極16と共通電極17との間に充填された液晶LCの配向状態が変化して液晶層中における光の透過率が変化する。これにより、表示素子10の背面に配置された図示しない光源(バックライト)からの光の透過状態が変化して映像表示が行われる。なお、i=1,2,3,・・・,m。j=1,2,3,・・・,n。   The gate electrode of the thin film transistor (TFT) 111 is connected to the scanning signal line G (j) shown in FIG. 3, and the source electrode of the TFT 111 is connected to the data signal line S (i). Further, the pixel electrode 16 is connected to the drain electrode of the TFT 111. A common electrode 17 is disposed on the other substrate 13 so as to face the pixel electrode 16, and a liquid crystal LC is filled between the pixel electrode 16 and the common electrode 17. Further, a storage capacitor Ccs is connected in parallel with the liquid crystal capacitor Clcd configured as described above. In such a configuration, when a voltage is applied between the pixel electrode 16 and the common electrode 17, the alignment state of the liquid crystal LC filled between the pixel electrode 16 and the common electrode 17 changes according to the voltage. As a result, the light transmittance in the liquid crystal layer changes. Thereby, the transmission state of light from a light source (backlight) (not shown) arranged on the back surface of the display element 10 is changed to display an image. I = 1, 2, 3,..., M. j = 1, 2, 3,..., n.

また、タッチパネル20は、図2、図6に示すように、一方の面に透明な抵抗膜21、22を形成した一対のシート23、24が、それぞれの抵抗膜形成面が対向するように枠状スペーサ25によって所定の間隙をおいて配置され、その外面がタッチされたときに、当該タッチされた側のシートにおけるタッチ位置が撓み変形し局部的に他方のシートの抵抗膜に接触するように構成されている。   Further, as shown in FIGS. 2 and 6, the touch panel 20 has a pair of sheets 23 and 24 having transparent resistance films 21 and 22 formed on one side, and a frame so that the respective resistance film formation surfaces face each other. When the outer surface is touched by the spacer 25 and the outer surface is touched, the touch position on the touched sheet is bent and deformed so as to locally contact the resistance film of the other sheet. It is configured.

なお、抵抗膜21には、所定の方向(例えばX軸)方向の両端縁にそれぞれ、その縁部の略全長にわたって、低抵抗金属膜からなる帯状電極21a、21bが設けられている。また、抵抗膜22には、前記所定の方向と直交する方向(例えばY軸という)方向の両端縁にそれぞれ、その縁部の略全長にわたって、低抵抗金属膜からなる帯状電極22a、22bが設けられている。そして、これら帯状電極21a、21b、22a、22bが後述のタッチパネル駆動回路に接続される。   The resistance film 21 is provided with strip-like electrodes 21a and 21b made of a low-resistance metal film over substantially the entire length of both ends in a predetermined direction (for example, the X axis). In addition, the resistance film 22 is provided with strip-like electrodes 22a and 22b made of a low-resistance metal film over substantially the entire length of each edge in the direction perpendicular to the predetermined direction (for example, the Y axis). It has been. These strip electrodes 21a, 21b, 22a, 22b are connected to a touch panel drive circuit described later.

駆動回路部30は、表示素子10の走査信号線を順に選択する走査信号線駆動回路31と、表示素子10のデータ信号線に例えば映像メモリ36に記憶された映像データに基づいた表示信号電圧を供給するデータ信号線駆動回路32と、表示素子10の共通電極17にコモン信号Vcomを供給する共通電極駆動回路33と、タッチパネル20を駆動するタッチパネル駆動回路34と、後述の各種制御信号を出力することにより走査信号線駆動回路31やデータ信号線駆動回路32、共通電極駆動回路33、タッチパネル駆動回路34等の同期を得る制御部35等を有している。   The drive circuit unit 30 sequentially selects a scanning signal line of the display element 10 and a display signal voltage based on video data stored in, for example, the video memory 36 on the data signal line of the display element 10. A data signal line driving circuit 32 to be supplied, a common electrode driving circuit 33 for supplying a common signal Vcom to the common electrode 17 of the display element 10, a touch panel driving circuit 34 for driving the touch panel 20, and various control signals described later are output. Thus, the scanning signal line drive circuit 31, the data signal line drive circuit 32, the common electrode drive circuit 33, the touch panel drive circuit 34, and the like are provided with a control unit 35 for obtaining synchronization.

走査信号線駆動回路31は、図3の走査信号線G(j)が接続され、制御部35から出力される垂直同期信号Vsに基づいて各フレームにおける走査信号線G(j)の走査を開始するとともに、制御部35から出力される水平同期信号Hsに基づいて各走査信号線G(j)を個別に選択状態にする。   The scanning signal line driving circuit 31 is connected to the scanning signal line G (j) of FIG. 3 and starts scanning the scanning signal line G (j) in each frame based on the vertical synchronization signal Vs output from the control unit 35. At the same time, the scanning signal lines G (j) are individually selected based on the horizontal synchronization signal Hs output from the control unit 35.

以下、説明を簡略化するために走査信号線の本数nを8本として具体的に説明するが、この本数に限定するものではない。走査信号線駆動回路31は、図4に示すように、制御部35から出力される垂直同期信号Vsが入力されると、当該フレームにおける走査信号線G(j)の走査を開始する。そして、水平同期信号Hsに基づいて前段側の走査信号線G(1)から後段側の走査信号線G(8)に向かって順に走査信号線G(j)を選択する。このとき、走査信号線駆動回路31は、選択した走査信号線G(j)に対応する走査信号を、TFTをオフ状態にさせるゲートオフ電圧VglからTFTをオン状態にさせるゲートオン電圧Vghへ所定の時間だけ切り換える。そして、走査信号線駆動回路31は、最後段の走査信号線G(j)を選択した後、次回の垂直同期信号Vsが入力されると、再び走査信号線G(j)の走査を開始する。即ち、走査信号線駆動回路31は、各フレームを、各走査信号線G(j)を順に選択する表示期間Tdと、走査信号線G(j)の選択を停止する帰線期間Trとに時分割している。   Hereinafter, in order to simplify the description, the number n of scanning signal lines is specifically described as eight, but the number is not limited to this. As shown in FIG. 4, when the vertical synchronization signal Vs output from the control unit 35 is input, the scanning signal line driving circuit 31 starts scanning the scanning signal line G (j) in the frame. Then, based on the horizontal synchronization signal Hs, the scanning signal line G (j) is selected in order from the scanning signal line G (1) on the front stage side to the scanning signal line G (8) on the rear stage side. At this time, the scanning signal line driving circuit 31 changes the scanning signal corresponding to the selected scanning signal line G (j) from the gate-off voltage Vgl that turns off the TFT to the gate-on voltage Vgh that turns on the TFT for a predetermined time. Switch only. Then, after the scanning signal line driving circuit 31 selects the scanning signal line G (j) at the last stage and then receives the next vertical synchronization signal Vs, the scanning signal line driving circuit 31 starts scanning the scanning signal line G (j) again. . That is, the scanning signal line driving circuit 31 performs each frame at a display period Td in which each scanning signal line G (j) is sequentially selected and a blanking period Tr in which selection of the scanning signal line G (j) is stopped. It is divided.

データ信号線駆動回路32は、制御部35から出力される垂直同期信号Vs、水平同期信号Hs、映像データData、基準クロック信号CLK、及び極性反転信号Polに基づいて、表示素子10に設けられた各データ信号線S(i)に対して、各データ信号線S(i)に対応する表示信号電圧を図4に示すように所定のタイミングで切り換えて出力するものである。   The data signal line drive circuit 32 is provided in the display element 10 based on the vertical synchronization signal Vs, the horizontal synchronization signal Hs, the video data Data, the reference clock signal CLK, and the polarity inversion signal Pol output from the control unit 35. For each data signal line S (i), the display signal voltage corresponding to each data signal line S (i) is switched and output at a predetermined timing as shown in FIG.

データ信号線駆動回路32の機能ブロック構成は、図5に示すように、サンプリングメモリ321、データラッチ部322、D/A変換回路(DAC)323、及び表示信号電圧生成回路324からなる。   As shown in FIG. 5, the functional block configuration of the data signal line driving circuit 32 includes a sampling memory 321, a data latch unit 322, a D / A conversion circuit (DAC) 323, and a display signal voltage generation circuit 324.

サンプリングメモリ321は、制御部35から出力される水平同期信号Hs及び基準クロック信号CLKに同期して、走査信号線一本分の表示画素に対応する画素データ(1水平期間分の画素データ)単位で、各表示画素に対応する画素データを前段側の走査信号線に対応するものから順に、映像メモリ36に記憶された映像データから取り込むためのものであり、データ信号線S(i)の数と同数のデータ格納領域を備えている。つまり、サンプリングメモリ321は、走査信号線毎に当該走査信号線に対応した画素データを取り込むとともに、当該取り込んだ画素データのそれぞれを、対応するデータ信号線S(i)のデータ格納領域に格納する。ここで、画素データには、各表示画素に表示すべき階調レベル情報が含まれ、この階調レベル情報は、表示画素毎に例えば8ビットのデジタルデータとして表される。そして、各データ格納領域には、この8ビットのデジタルデータが格納される。   The sampling memory 321 is synchronized with the horizontal synchronization signal Hs and the reference clock signal CLK output from the control unit 35, and is a unit of pixel data (pixel data for one horizontal period) corresponding to a display pixel for one scanning signal line. Thus, the pixel data corresponding to each display pixel is taken in from the video data stored in the video memory 36 in order from the one corresponding to the scanning signal line on the preceding stage side, and the number of data signal lines S (i) The same number of data storage areas are provided. That is, the sampling memory 321 captures pixel data corresponding to the scanning signal line for each scanning signal line, and stores each of the captured pixel data in the data storage area of the corresponding data signal line S (i). . Here, the pixel data includes gradation level information to be displayed on each display pixel, and the gradation level information is expressed as, for example, 8-bit digital data for each display pixel. Each data storage area stores the 8-bit digital data.

サンプリングメモリ321が取り込んだ1水平期間分の画素データは、後段のデータラッチ部322からの要求にしたがって、サンプリングメモリ321からデータラッチ部322に転送される。データラッチ部322に画素データが転送されると、サンプリングメモリ321は、次の1水平期間分の画素データとして次の行の走査信号線に対応した画素データの取り込み状態に移る。これは、水平同期信号Hsに同期して行われる。   Pixel data for one horizontal period captured by the sampling memory 321 is transferred from the sampling memory 321 to the data latch unit 322 in accordance with a request from the data latch unit 322 in the subsequent stage. When the pixel data is transferred to the data latch unit 322, the sampling memory 321 shifts to a pixel data capturing state corresponding to the scanning signal line of the next row as pixel data for the next one horizontal period. This is performed in synchronization with the horizontal synchronization signal Hs.

データラッチ部322は、水平同期信号Hsに基づいて、サンプリングメモリ321から1水平期間分の画素データを一斉に取得するとともに、取得した画素データを後段のD/A変換回路323に出力する。   The data latch unit 322 simultaneously acquires pixel data for one horizontal period from the sampling memory 321 based on the horizontal synchronization signal Hs, and outputs the acquired pixel data to the D / A conversion circuit 323 in the subsequent stage.

D/A変換回路323は、複数のDAC部325及び出力アンプ回路326で構成され、DAC部325により表示信号電圧生成回路324から供給される表示信号電圧が選択されることで、データラッチ部322から出力されてくるそれぞれの画素データが、対応するアナログ信号としての表示信号電圧に変換され、出力アンプ回路326によりデータ信号線S(i)へ出力される。   The D / A conversion circuit 323 includes a plurality of DAC units 325 and an output amplifier circuit 326. When the display signal voltage supplied from the display signal voltage generation circuit 324 is selected by the DAC unit 325, the data latch unit 322 is selected. Each pixel data output from is converted into a display signal voltage as a corresponding analog signal, and output to the data signal line S (i) by the output amplifier circuit 326.

また、D/A変換回路323は、制御部35から出力される極性反転信号Polに対応するように、データラッチ部322から出力されたデジタル形式の画素データをアナログ電圧としての表示信号電圧に変換する。具体的には、D/A変換回路323は、極性反転信号Polがハイレベルであれば、データラッチ部322から出力された画素データが正極性の表示信号電圧になるようにD/A変換し、極性反転信号Polがローレベルであれば、データラッチ部322から出力された画素データが負極性の表示信号電圧になるようにD/A変換する。換言すると、D/A変換回路323は、極性反転信号Polがハイレベルであるときは、液晶に印加される電圧が正極性となるようにD/A変換し、極性反転信号Polがローレベルであるときは、液晶に印加される電圧が負極性となるようにD/A変換する。   The D / A conversion circuit 323 converts the digital pixel data output from the data latch unit 322 into a display signal voltage as an analog voltage so as to correspond to the polarity inversion signal Pol output from the control unit 35. To do. Specifically, if the polarity inversion signal Pol is at a high level, the D / A conversion circuit 323 performs D / A conversion so that the pixel data output from the data latch unit 322 becomes a positive display signal voltage. If the polarity inversion signal Pol is at a low level, D / A conversion is performed so that the pixel data output from the data latch unit 322 has a negative display signal voltage. In other words, when the polarity inversion signal Pol is at a high level, the D / A conversion circuit 323 performs D / A conversion so that the voltage applied to the liquid crystal is positive, and the polarity inversion signal Pol is at a low level. In some cases, D / A conversion is performed so that the voltage applied to the liquid crystal is negative.

共通電極駆動回路33は、制御部35から出力される極性反転信号Polに基づいて共通電極17に共通信号Vcomを供給するもので、図4に示すように、極性反転信号Polがハイレベルのときに液晶に印加される電圧が正極性になるように第一の共通電圧Vclを出力し、極性反転信号Polがローレベルのときに液晶に印加される電圧が負極性になるように第二の共通電圧Vchを出力する。   The common electrode drive circuit 33 supplies the common signal Vcom to the common electrode 17 based on the polarity inversion signal Pol output from the control unit 35. When the polarity inversion signal Pol is at a high level as shown in FIG. The first common voltage Vcl is output so that the voltage applied to the liquid crystal is positive, and the second voltage is applied so that the voltage applied to the liquid crystal is negative when the polarity inversion signal Pol is at a low level. The common voltage Vch is output.

タッチパネル駆動回路34は、図6(A)、図6(B)に示すように、抵抗膜21のX軸方向の両端縁の帯状電極21a、21b間と抵抗膜22のY軸方向の両端縁の帯状電極22a、22b間とに一定値の電圧を交互に印加する電圧印加回路341と、所定の帯状電極間に印加される電圧値を検出してタッチ点の座標を導出する座標検出回路342を備えている。   As shown in FIGS. 6A and 6B, the touch panel drive circuit 34 is formed between the strip-like electrodes 21a and 21b on both ends of the resistance film 21 in the X-axis direction and both ends of the resistance film 22 in the Y-axis direction. Voltage application circuit 341 that alternately applies a constant voltage between the strip-shaped electrodes 22a and 22b, and a coordinate detection circuit 342 that detects the voltage value applied between the predetermined strip-shaped electrodes and derives the coordinates of the touch point. It has.

電圧印加回路341は、定電圧電源Vdcと、2つの接続切換スイッチSw1、Sw2とを有している。そして、定電圧電源Vdcにおける+極が接続切換スイッチSw1を介して帯状電極21aまたは帯状電極22aに接続されている。接続切換スイッチSw1は定電圧電源Vdcにおける+極の接続先を帯状電極21aと帯状電極22aとの間で切り換える。また、定電圧電源Vdcにおける−極が接続切換スイッチSw2を介して帯状電極21bまたは帯状電極22bに接続されている。接続切換スイッチSw2は定電圧電源Vdcにおける−極の接続先を帯状電極21bと帯状電極22bとの間で切り換える。即ち、電圧印加回路341は、接続切換スイッチSw1、Sw2を切り換えることによって、定電圧電源Vdcから出力される電圧を抵抗膜21と抵抗膜22とに交互に印加する。なお、図6(A)、図6(B)に示した定電圧電源Vdcは直流電源であるが、この定電圧電源Vdcは交流電源でもよい。   The voltage application circuit 341 includes a constant voltage power supply Vdc and two connection changeover switches Sw1 and Sw2. The positive pole of the constant voltage power supply Vdc is connected to the strip electrode 21a or the strip electrode 22a via the connection changeover switch Sw1. The connection changeover switch Sw1 switches the connection destination of the positive pole in the constant voltage power supply Vdc between the strip electrode 21a and the strip electrode 22a. Further, the negative pole of the constant voltage power supply Vdc is connected to the strip electrode 21b or the strip electrode 22b via the connection changeover switch Sw2. The connection changeover switch Sw2 switches the connection destination of the negative pole in the constant voltage power supply Vdc between the strip electrode 21b and the strip electrode 22b. That is, the voltage application circuit 341 alternately applies the voltage output from the constant voltage power supply Vdc to the resistance film 21 and the resistance film 22 by switching the connection changeover switches Sw1 and Sw2. Although the constant voltage power supply Vdc shown in FIGS. 6A and 6B is a DC power supply, the constant voltage power supply Vdc may be an AC power supply.

また、座標検出回路342は、電圧測定器Deと、接続切換スイッチSw3と、電圧測定器Deにより検出した電圧に基づいてタッチ点の座標を導出する座標演算部343とを有している。電圧測定器Deは、その一端側が定電圧電源Vdcにおける−極と接続切換スイッチSw2との間の所定のポイントPに接続されるとともに、その他端側が接続切換スイッチSw3を介して帯状電極21bまたは帯状電極22bに接続されている。接続切換スイッチSw3は、接続切換スイッチSw1及び接続切換スイッチSw2の接続切り換えタイミングに同期して、図6(A)、図6(B)に示すように、電圧測定器Deにおける他端側の接続先を帯状電極21bと帯状電極22bとの間で切り換える。   In addition, the coordinate detection circuit 342 includes a voltage measurement device De, a connection changeover switch Sw3, and a coordinate calculation unit 343 that derives the coordinates of the touch point based on the voltage detected by the voltage measurement device De. The voltage measuring device De is connected at one end to a predetermined point P between the negative pole of the constant voltage power source Vdc and the connection changeover switch Sw2, and at the other end via the connection changeover switch Sw3. It is connected to the electrode 22b. The connection selector switch Sw3 is connected to the other end side of the voltage measuring device De as shown in FIGS. 6A and 6B in synchronization with the connection switching timing of the connection selector switch Sw1 and the connection selector switch Sw2. The tip is switched between the strip electrode 21b and the strip electrode 22b.

なお、接続切換スイッチSw1、Sw2、Sw3の切り換え周波数は、フレーム周波数よりも十分に高い周波数で、例えば後述の座標演算部343により一括同時制御される。   Note that the switching frequency of the connection change-over switches Sw1, Sw2, and Sw3 is a frequency sufficiently higher than the frame frequency, and is collectively controlled by, for example, a coordinate calculation unit 343 described later.

座標演算部343は、制御部35から出力される垂直同期信号Vsを基準として同じく制御部35から出力される水平同期信号Hsをカウントすることにより上述した帰線期間Trを検出するとともに、当該帰線期間Trに電圧測定器Deにより検出された電圧値に基づいてタッチパネル20上のタッチ点を演算導出する。即ち、タッチパネル駆動回路34は、図4に示すように帰線期間Trにタッチパネル20へのタッチ点を検出するとともに、表示期間Tdにタッチパネル20へのタッチ点の検出を停止する。さらに換言すると、タッチパネル駆動回路34は、表示期間Tdに検出されたタッチパネル20へのタッチ情報を省いて、タッチパネル20へのタッチ点を導出する。   The coordinate calculation unit 343 detects the above-described blanking period Tr by counting the horizontal synchronization signal Hs output from the control unit 35 by using the vertical synchronization signal Vs output from the control unit 35 as a reference. The touch point on the touch panel 20 is calculated and derived based on the voltage value detected by the voltage measuring device De during the line period Tr. That is, as shown in FIG. 4, the touch panel drive circuit 34 detects a touch point on the touch panel 20 in the blanking period Tr and stops detecting the touch point on the touch panel 20 in the display period Td. In other words, the touch panel drive circuit 34 derives a touch point on the touch panel 20 by omitting touch information on the touch panel 20 detected in the display period Td.

以下、タッチ点の演算導出について説明する。定電圧電源Vdcの電圧値をV0、抵抗膜21のX軸方向の一端(帯状電極21bの内側縁)におけるX座標値を0、抵抗膜21のX軸方向の他端(帯状電極21aの内側縁)におけるX座標値を1、タッチ点のX座標をx、抵抗膜21のX軸方向の両端間(帯状電極21aと帯状電極221bとの間)の抵抗値をrx、電圧測定器Deの内部抵抗値をRとすると、抵抗膜21のX軸方向の両端間に電圧V0を印加したときの電圧測定器Deによる測定電圧値V(x)は、rx≪Rであるため、
V(x)=V0(1−x)
で表すことができる。
Hereinafter, calculation of touch point calculation will be described. The voltage value of the constant voltage power supply Vdc is V 0 , the X coordinate value at one end in the X-axis direction of the resistive film 21 (inner edge of the strip-shaped electrode 21b) is 0, and the other end of the resistive film 21 in the X-axis direction (of the strip-shaped electrode 21a The X coordinate value at the inner edge) is 1, the X coordinate of the touch point is x, the resistance value between both ends of the resistive film 21 in the X-axis direction (between the strip electrode 21a and the strip electrode 221b) is r x , and a voltage measuring device Assuming that the internal resistance value of De is R, the measured voltage value V (x) by the voltage measuring device De when the voltage V 0 is applied across the X-axis direction of the resistance film 21 is r x << R. ,
V (x) = V 0 (1-x)
Can be expressed as

また、抵抗膜22のY軸方向の一端(帯状電極22bの内側縁)におけるY座標値を0、抵抗膜22のY軸方向の他端(帯状電極22aの内側縁)のY座標値を1、タッチ点のY座標をy、抵抗膜22のY軸方向の両端間(帯状電極22aと帯状電極22bとの間)の抵抗値をryとすると、抵抗膜22のY軸方向の両端間に電圧V0を印加したときの電圧測定器Deの測定電圧値V(y)は、ry≪Rであるため、
V(y)=V0(1−y)
で表すことができる。
Further, the Y coordinate value at one end of the resistance film 22 in the Y-axis direction (inner edge of the strip electrode 22b) is 0, and the Y coordinate value of the other end of the resistance film 22 in the Y axis direction (inner edge of the strip electrode 22a) is 1. the Y coordinate of the touch point y, the resistive film 22 Y-axis direction between both ends and the resistance value of (between the strip electrodes 22a and strip electrodes 22b) and r y, across the Y-axis direction of the resistance film 22 Since the measured voltage value V (y) of the voltage measuring device De when the voltage V 0 is applied to is r y << R,
V (y) = V 0 (1-y)
Can be expressed as

したがって、タッチ点のX座標xとY座標yは、
x=1−V(x)/V0
y=1−V(y)/V0
により求めることができる。
Therefore, the X coordinate x and Y coordinate y of the touch point are
x = 1−V (x) / V 0
y = 1−V (y) / V 0
It can ask for.

即ち、本実施の形態では、座標演算部343は、表示期間Tdに電圧測定器Deにより検出された電圧値、即ち、走査信号線駆動回路31やデータ信号線駆動回路32が水平同期信号に同期して動作する際に発生させるノイズが重畳した電圧値を用いることなく、帰線期間Trに電圧測定器Deにより検出された電圧値に基づいてタッチパネル20上のタッチ点を演算導出するため、タッチ点の誤検出を防止することができる。   That is, in this embodiment, the coordinate calculation unit 343 detects the voltage value detected by the voltage measuring device De during the display period Td, that is, the scanning signal line driving circuit 31 and the data signal line driving circuit 32 are synchronized with the horizontal synchronization signal. In order to calculate and derive the touch point on the touch panel 20 based on the voltage value detected by the voltage measuring device De during the retrace period Tr without using the voltage value on which noise generated during operation is superimposed. It is possible to prevent erroneous detection of points.

なお、上述の実施の形態では、制御部35が座標演算部343に垂直同期信号及び水平同期信号を出力し、座標演算部343が当該垂直同期信号及び水平同期信号に基づいて帰線期間を検出する場合について説明したが、走査信号線駆動回路31が制御部35から入力される垂直同期信号及び水平同期信号に基づいて帰線期間を検出するとともに当該帰線期間を示す制御信号を座標演算部343に出力し、この制御信号に基づいて座標演算部343が帰線期間を検出する構成としてもよい。   In the above-described embodiment, the control unit 35 outputs a vertical synchronization signal and a horizontal synchronization signal to the coordinate calculation unit 343, and the coordinate calculation unit 343 detects a blanking period based on the vertical synchronization signal and the horizontal synchronization signal. The scanning signal line drive circuit 31 detects the blanking period based on the vertical synchronizing signal and the horizontal synchronizing signal input from the control unit 35, and sends a control signal indicating the blanking period to the coordinate calculation unit. It is good also as a structure which outputs to 343 and the coordinate calculating part 343 detects a blanking period based on this control signal.

また、上述の実施の形態では、定電圧電源Vdcが常時、電圧を出力する構成について説明したが、定電圧電源Vdcは帰線期間に電圧を出力し、表示期間には電圧出力を停止する構成としてもよい。消費電力を低減することができ好ましい。   In the above-described embodiment, the configuration in which the constant voltage power supply Vdc always outputs a voltage has been described. However, the constant voltage power supply Vdc outputs a voltage in the blanking period and stops voltage output in the display period. It is good. It is preferable because power consumption can be reduced.

上述した実施の形態は、本発明の一例に過ぎず、各機能ブロックの具体的な構成は本発明の作用効果を奏する範囲において適宜変更設計できることはいうまでもない。   The above-described embodiment is merely an example of the present invention, and it goes without saying that the specific configuration of each functional block can be changed and designed as appropriate within the scope of the effects of the present invention.

表示装置の概略全体構成図Schematic overall configuration diagram of display device 表示素子及びタッチパネルの断面図Cross section of display element and touch panel 表示画素の等価回路Display pixel equivalent circuit 表示装置の動作を説明するためのタイミングチャートTiming chart for explaining operation of display device データ信号線駆動回路の構成図Configuration diagram of data signal line drive circuit タッチパネル駆動回路の構成図Configuration diagram of touch panel drive circuit

符号の説明Explanation of symbols

1:表示装置
10:表示素子
20:タッチパネル
30:駆動回路
31:走査信号線駆動回路
32:データ信号線駆動回路
33:共通電極駆動回路
34:タッチパネル駆動回路
35:制御部
36:映像メモリ
Td:表示期間
Tr:帰線期間
1: Display device 10: Display element 20: Touch panel 30: Drive circuit 31: Scanning signal line drive circuit 32: Data signal line drive circuit 33: Common electrode drive circuit 34: Touch panel drive circuit 35: Control unit 36: Video memory Td: Display period Tr: Return period

Claims (3)

互いに平行な複数の走査信号線と前記各走査信号線に交差するデータ信号線とが表示領域に形成された表示素子と、
各フレームを表示期間と帰線期間とに時分割し、前記表示期間に前記走査信号線を順に選択するとともに、前記帰線期間に前記走査信号線の選択を停止する走査信号線駆動手段と、
前記表示領域上に配置されたタッチパネルと、
前記タッチパネルを駆動して、前記帰線期間に前記タッチパネルへのタッチ点を検出するとともに、前記表示期間に前記タッチパネルへのタッチ点の検出を停止する駆動手段と、
を備えたことを特徴とする表示装置。
A display element in which a plurality of scanning signal lines parallel to each other and a data signal line intersecting each scanning signal line are formed in a display region;
Scanning signal line driving means for time-dividing each frame into a display period and a blanking period, selecting the scanning signal lines in order in the display period, and stopping selection of the scanning signal line in the blanking period;
A touch panel disposed on the display area;
Driving means for driving the touch panel to detect a touch point to the touch panel during the blanking period, and to stop detecting the touch point to the touch panel during the display period;
A display device comprising:
互いに平行な複数の走査信号線と前記各走査信号線に交差するデータ信号線とが表示領域に形成された表示素子と、
各フレームを表示期間と帰線期間とに時分割し、前記表示期間に前記走査信号線を順に選択するとともに、前記帰線期間に前記走査信号線の選択を停止する走査信号線駆動手段と、
前記表示領域上に配置されたタッチパネルと、
前記タッチパネルを駆動して、前記表示期間に検出された前記タッチパネルへのタッチ情報を省いて、前記タッチパネルへのタッチ点を導出する駆動手段と、
を備えたことを特徴とする表示装置。
A display element in which a plurality of scanning signal lines parallel to each other and a data signal line intersecting each scanning signal line are formed in a display region;
Scanning signal line driving means for time-dividing each frame into a display period and a blanking period, selecting the scanning signal lines in order in the display period, and stopping selection of the scanning signal line in the blanking period;
A touch panel disposed on the display area;
Driving means for driving the touch panel, omitting touch information to the touch panel detected during the display period, and deriving a touch point to the touch panel;
A display device comprising:
前記駆動手段は、前記走査信号線駆動手段から出力される制御信号に基づいて帰線期間を検出することを特徴とする請求項1または2に記載の表示装置。   The display device according to claim 1, wherein the driving unit detects a blanking period based on a control signal output from the scanning signal line driving unit.
JP2008147823A 2008-06-05 2008-06-05 Display device Pending JP2009294903A (en)

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