WO2010146638A1 - Liquid crystal display driver control apapratus and control method thereof - Google Patents

Liquid crystal display driver control apapratus and control method thereof Download PDF

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Publication number
WO2010146638A1
WO2010146638A1 PCT/JP2009/006732 JP2009006732W WO2010146638A1 WO 2010146638 A1 WO2010146638 A1 WO 2010146638A1 JP 2009006732 W JP2009006732 W JP 2009006732W WO 2010146638 A1 WO2010146638 A1 WO 2010146638A1
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signal
driver control
switching
video data
driver
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PCT/JP2009/006732
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French (fr)
Japanese (ja)
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芝田英明
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パナソニック株式会社
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/34—Control 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
    • G09G3/36—Control 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
    • G09G3/3611—Control of matrices with row and column drivers

Definitions

  • the present invention relates to a control device and a control method for a liquid crystal display driver such as a source driver and a gate driver for driving a liquid crystal display panel, and displays two or more types of video signals generated with different synchronization signals after switching.
  • a liquid crystal display driver such as a source driver and a gate driver for driving a liquid crystal display panel
  • displays two or more types of video signals generated with different synchronization signals after switching When switching on the basis of the synchronizing signal of the video signal to be performed, the generation method of the gate driver command to be output to the gate driver is intended to reduce the sense of incongruity as the video appearance at the time of switching.
  • a black image is displayed in an insertion unit for a time controlled by a microcomputer with respect to a video signal selected by a rearrangement unit in a multi-view display device that displays two different images on one screen. Is inserted and output to the TFT-type liquid crystal display to control so as not to disturb the video when switching between the two types of video signals (see Patent Document 1).
  • the present invention solves the above-described conventional problem, and when two or more types of video signals generated with different synchronization signals are switched and displayed on a liquid crystal display panel, the image is not uncomfortable when switching.
  • An object of the present invention is to provide a liquid crystal display driver control device and a control method therefor.
  • the liquid crystal display driver control apparatus and the control method thereof provide a horizontal synchronization signal of each video signal and two or more types of video signals generated with different synchronization signals.
  • a driver control signal including a gate driver command is generated based on the vertical synchronization signal.
  • the timing of the vertical synchronization signal synchronized with the video signal selected and output after switching is compared with that of the video signal selected and output before switching.
  • the gate driver command generated in synchronization with the At the timing of the vertical synchronizing signal synchronized with the signal is obtained by the outputting switch and a driver control signal including the image data and each of the gate driver commands, respectively.
  • the gate driver command is changed by changing the gate driver command synchronized with the horizontal synchronization signal of the video signal in the period immediately before the switching.
  • the black video is inserted at the time of switching. It is possible to suppress the occurrence of freezing of the video signal within one frame period without causing blackout or video disturbance, and to enjoy viewing with less sense of incongruity as the video appearance at the time of switching. In particular, if the video signal displayed at the time of switching is a still video, the effect is great.
  • Embodiment 1 of this invention It is a block diagram of the liquid crystal display driver control apparatus in Embodiment 1 of this invention. It is a timing diagram of each signal in FIG. It is a block diagram of the liquid crystal display driver control apparatus in Embodiment 2 of this invention.
  • FIG. 1 shows a liquid crystal display driver control apparatus and control method thereof according to Embodiment 1 of the present invention.
  • the liquid crystal display driver control device of FIG. 1 is a device for controlling a liquid crystal display driver such as a source driver 108 and a gate driver 109 for driving the liquid crystal display panel 110.
  • the liquid crystal display driver control device shown in FIG. One horizontal synchronizing signal H1 and first vertical synchronizing signal V1 are extracted and output, while a first input video signal processing unit 101 that outputs first video data P1 and a second input video signal IN2 are output.
  • the second horizontal synchronizing signal H2 and the second vertical synchronizing signal V2 are extracted and output, while the second input video signal processing unit 102 that outputs the second video data P2 and the switching instruction signal CH.
  • a liquid crystal display such as a source driver 108 and a gate driver 109 based on the first vertical synchronizing signal V1 and the second vertical synchronizing signal V2.
  • the switch timing generation unit 103 that generates and outputs the second command forced change signal C2, the first horizontal synchronization signal H1, the first vertical synchronization signal V1, and the first command forced change signal C1 according to the first command to the liquid crystal display driver.
  • the first driver control signal generation unit 104 that generates one driver control signal D1, the second horizontal synchronization signal H2, the second vertical synchronization signal V2, and the second command forced change signal C2 are sent to the liquid crystal display driver.
  • the first driver control signal D1 and the second driver control signal D2 are selectively switched by the output switching signal SW input from the switching timing generation unit 103, and the control signal SD to the source driver 108 and the output to the gate driver 109 (
  • the driver control signal selection unit 107 outputs GD (including gate driver commands).
  • the switching timing generation unit 103 When switching from the selection state of the first input video signal IN1 to the selection state of the second input video signal IN2, the switching timing generation unit 103 generates the output switching signal SW at a timing synchronized with the second vertical synchronization signal V2.
  • the first command forced change signal C1 is validated in synchronization with the first horizontal synchronization signal H1 generated at least next to the switching instruction signal CH, the first command synchronization change signal C1 is synchronized with the second vertical synchronization signal V2.
  • the command forced change signal C1 of 1 is invalidated.
  • the switching timing generation unit 103 when switching from the selection state of the second input video signal IN2 to the selection state of the first input video signal IN1, the switching timing generation unit 103 outputs the output switching signal SW at a timing synchronized with the first vertical synchronization signal V1.
  • the second command forced change signal C2 is made effective in synchronization with the second horizontal synchronization signal H2 generated at least next to the switching instruction signal CH, and then synchronized with the first vertical synchronization signal V1.
  • the second command forced change signal C2 is invalidated.
  • the first driver control signal generation unit 104 includes a first horizontal synchronization signal H1 and a first vertical synchronization signal V1 from the first input video signal processing unit 101, and a first command from the switching timing generation unit 103.
  • a first driver control signal D1 necessary to drive the source driver 108 and the gate driver 109 is generated from the forced change signal C1.
  • the start command (S) is given at the timing of the first horizontal synchronization signal H1 at the head of the frame, and at the other timings of the first horizontal synchronization signal H1.
  • Each normal command (N) is generated, and when the first command forced change signal C1 becomes valid, a shift register clear command (C) is generated instead of the normal command (N).
  • the second driver control signal generation unit 105 receives the second horizontal synchronization signal H2 and the second vertical synchronization signal V2 from the second input video signal processing unit 102, and the second from the switching timing generation unit 103.
  • the second driver control signal D2 necessary for driving the source driver 108 and the gate driver 109 is generated from the command forced change signal C2.
  • the start command (S) is given at the timing of the second horizontal synchronization signal H2 at the head of the frame, and at the timing of the other second horizontal synchronization signal H2.
  • Each normal command (N) is generated, and when the second command forced change signal C2 becomes valid, a shift register clear command (C) is generated instead of the normal command (N).
  • the liquid crystal display driver control apparatus configured as described above and its control method will be described with reference to FIG.
  • the first input video signal IN1 is input to the first input video signal processing unit 101, and the second input video signal IN2 is input to the second input video signal processing unit 102, respectively.
  • These two input video signals IN1 and IN2 are, for example, programs of different channels of television broadcasting, and the horizontal and vertical synchronizing signals are asynchronous with each other.
  • the first input video signal processing unit 101 extracts the first horizontal synchronization signal H1, the first vertical synchronization signal V1, and the first video data P1 from the first input video signal IN1, and outputs them.
  • the second input video signal processing unit 102 extracts the second horizontal synchronization signal H2, the second vertical synchronization signal V2, and the second video data P2 from the second input video signal IN2, and outputs them.
  • the pulse of the first vertical synchronizing signal V1 is the top of the frame of the first input video signal IN1
  • the pulse of the second vertical synchronizing signal V2 is the second input video signal IN2.
  • Each frame head is shown.
  • the switching timing generation unit 103 When the switching instruction signal CH input to the switching timing generation unit 103 is a signal that rises from the Low level to the High level at time t1 as shown in FIG. 2, the second input from the selection state of the first input video signal IN1. It shows switching to the selection state of the video signal IN2. Therefore, the switching timing generation unit 103 generates the output switching signal SW at a timing synchronized with the second vertical synchronization signal V2, while synchronizing with the first horizontal synchronization signal H1 generated at least next to the switching instruction signal CH. After the first command forced change signal C1 is validated at time t2, the first command forced change signal C1 is invalidated at time t3 in synchronization with the second vertical synchronization signal V2. In the example of FIG. 2, since the selection state of the first input video signal IN1 is switched to the selection state of the second input video signal IN2, the second command forced change signal C2 is not valid.
  • the first driver control signal generation unit 104 uses the shift register clear command (C) instead of the normal command (N). As part of the first driver control signal D1.
  • the signal selection processing unit 106 switches the first video data P1 from the first input video signal processing unit 101 and the second video data P2 from the second input video signal processing unit 102 to a switching timing generation unit 103.
  • the video data P is output to the source driver 108 by selection processing using the output switching signal SW.
  • the driver control signal selection unit 107 switches the first driver control signal D1 from the first driver control signal generation unit 104 and the second driver control signal D2 from the second driver control signal generation unit 105 at the switching timing.
  • a selection process is performed by the output switching signal SW from the generation unit 103, and a control signal SD to the source driver 108 and an output GD (including a gate driver command) GD to the gate driver 109 are output.
  • the discontinuity of the video signal can be reduced during the period from time t1 to time t3 in FIG. Since it is not a structure to insert, there is no problem that the video is blacked out before and after switching.
  • FIG. 3 shows a liquid crystal display driver control apparatus and control method thereof according to Embodiment 2 of the present invention.
  • the input video signal processing unit 101 in FIG. 1 is replaced with an internal video signal generation unit 201.
  • the internal video signal generation unit 201 performs a free-run operation assuming that the input video signal IN2 is not input to the input video signal processing unit 102, and outputs the first horizontal synchronization signal H1 and the first vertical synchronization signal V1.
  • the test video data T1 generated internally is output.
  • the switching timing generation unit 103a generates an output switching signal SW based on the switching instruction signal CH and the second vertical synchronization signal V2, and generates a command forced change signal C1 to the first driver control signal generation unit 104.
  • the second driver control signal generation unit 105a is different from the first driver control signal generation unit 104 in that it does not receive a command forced change signal and always performs a steady operation.
  • the switching instruction signal CH input to the switching timing generation unit 103a requests switching from the selection state of the test video data T1 to the selection state of the input video data P2.
  • it is not a normal command to the gate driver 109 from the first horizontal synchronization signal H1 after the command forcible change signal C1 becomes valid, and the internal forced Since the shift register clear command for erasing the shift data is issued and changed, all the outputs of the gate driver 109 are turned off, so that the display screen is not updated from the middle of the screen, and the second vertical synchronization signal Until V2 is input, the test video data T1 of the internal video signal generator 201 is displayed.
  • discontinuity can be reduced when switching from the test video data display to the input video data display, and the conventional black data is inserted. Since it is not a configuration, the input video signal can be viewed immediately, and there is no problem that the period during which it is invisible after blacking out becomes long.
  • the liquid crystal display driver control apparatus and the control method thereof according to the present invention switch two or more types of video signals generated by different synchronization signals such as television broadcast channel switching and display them on the liquid crystal display panel.
  • the sense of incongruity is reduced as the way the video is viewed at the time of switching, it is useful when applied to a liquid crystal display.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract

A switch timing generation unit (103) is provided. For example, if a switching command signal (CH) to request a switchover from a first input image signal (IN1) to a second input image signal (IN2) is supplied, the switch timing generation unit generates an output switchover signal (SW) at a time synchronous with a second vertical synchronization signal (V2) of an image signal after switchover. In the period of time from the issuance of the switchover command signal (CH) to the generation of the output switchover signal (SW), the gate driver command which is generated in synchronization with a first horizontal synchronization signal (H1) before switchover is forcibly changed to a shift register clear command. Consequently, the image immediately before the switchover is frozen over the period of time from the associated line to the vertical synchronization signal of the image after switchover, and thus the discontinuity at the time of switchover can be reduced.

Description

液晶ディスプレイドライバ制御装置及びその制御方法Liquid crystal display driver control device and control method thereof
　本発明は、液晶ディスプレイパネルを駆動するソースドライバ、ゲートドライバといった液晶ディスプレイドライバの制御装置及びその制御方法に関するものであって、異なる同期信号で生成される２種類以上の映像信号を、切り替え後に表示する映像信号の同期信号を基準に切り替える際に、ゲートドライバに出力するゲートドライバコマンドの生成方法により、切り替わり時点の映像の見え方として違和感を軽減しようとするものである。 The present invention relates to a control device and a control method for a liquid crystal display driver such as a source driver and a gate driver for driving a liquid crystal display panel, and displays two or more types of video signals generated with different synchronization signals after switching. When switching on the basis of the synchronizing signal of the video signal to be performed, the generation method of the gate driver command to be output to the gate driver is intended to reduce the sense of incongruity as the video appearance at the time of switching.
　ある従来技術によれば、１つの画面内に２つの異なる画像を表示するマルチビューディスプレイ装置にて並び替え部で選択された映像信号に対してマイコンで制御される時間だけ挿入部にて黒映像を挿入してＴＦＴ型液晶ディスプレイに出力することによって、２種類の映像信号の切り替え時の映像の乱れをなくすように制御する（特許文献１参照）。 According to a certain prior art, a black image is displayed in an insertion unit for a time controlled by a microcomputer with respect to a video signal selected by a rearrangement unit in a multi-view display device that displays two different images on one screen. Is inserted and output to the TFT-type liquid crystal display to control so as not to disturb the video when switching between the two types of video signals (see Patent Document 1).
特開２００７－３６４５４号公報JP 2007-36454 A
　しかしながら、前記従来の構成では、異なる同期信号で生成される２種類以上の映像信号を切り替えて液晶ディスプレイパネルに表示させる場合、切り替え時点で黒映像が挿入される構成であるために、切り替えに要する時間が長くなると黒映像が長時間にわたって表示され、映像の見え方として違和感があるという課題を有していた。 However, in the conventional configuration, when two or more types of video signals generated with different synchronization signals are switched and displayed on the liquid crystal display panel, a black video is inserted at the time of switching, and thus switching is required. When the time is long, the black image is displayed for a long time, and there is a problem that the image looks strange.
　本発明は、前記従来の課題を解決するもので、異なる同期信号で生成される２種類以上の映像信号を切り替えて液晶ディスプレイパネルに表示する場合に、切り替わり時の映像の見え方として違和感の少ない液晶ディスプレイドライバ制御装置及びその制御方法を提供することを目的とする。 The present invention solves the above-described conventional problem, and when two or more types of video signals generated with different synchronization signals are switched and displayed on a liquid crystal display panel, the image is not uncomfortable when switching. An object of the present invention is to provide a liquid crystal display driver control device and a control method therefor.
　前記従来の課題を解決するために、本発明の液晶ディスプレイドライバ制御装置及びその制御方法は、異なる同期信号で生成される２種類以上の映像信号に対して、それぞれの映像信号の水平同期信号及び垂直同期信号を元に、ゲートドライバコマンドを含むドライバ制御信号を生成する一方、切り替え後に選択出力される映像信号に同期した垂直同期信号のタイミングに対して、切り替え前に選択出力される映像信号の水平同期信号として１つ以上前であって、かつ、外部から入力される切り替え指示信号のタイミングに対して、切り替え前に選択出力される映像信号の水平同期信号として１つ以上後の水平同期信号に同期して生成するゲートドライバコマンドを強制的に変更制御するように生成し、かつ切り替え後に選択出力される映像信号に同期した垂直同期信号のタイミングでそれぞれに映像データとそれぞれのゲートドライバコマンドを含むドライバ制御信号とを切り替え出力することとしたものである。 In order to solve the above-described conventional problems, the liquid crystal display driver control apparatus and the control method thereof according to the present invention provide a horizontal synchronization signal of each video signal and two or more types of video signals generated with different synchronization signals. A driver control signal including a gate driver command is generated based on the vertical synchronization signal. On the other hand, the timing of the vertical synchronization signal synchronized with the video signal selected and output after switching is compared with that of the video signal selected and output before switching. One or more horizontal synchronization signals before the horizontal synchronization signal, and one or more horizontal synchronization signals as the horizontal synchronization signal of the video signal selected and output before switching with respect to the timing of the switching instruction signal input from the outside The gate driver command generated in synchronization with the At the timing of the vertical synchronizing signal synchronized with the signal is obtained by the outputting switch and a driver control signal including the image data and each of the gate driver commands, respectively.
　異なる同期信号で生成される２種類以上の映像信号を切り替えて液晶ディスプレイパネルに表示する場合に、切り替わり直前の期間において映像信号の水平同期信号に同期したゲートドライバコマンドを変更することにより、ゲートドライバコマンドを変更した該当ラインから切り替わり後の映像信号の垂直同期信号までの期間にわたって切り替わり直前の映像信号をフリーズさせ、１フレーム前の映像信号を表示することにより、切り替わり時点で１フレーム期間以下の映像信号のフリーズが発生するだけに抑えることができる。 When two or more types of video signals generated with different synchronization signals are switched and displayed on the liquid crystal display panel, the gate driver command is changed by changing the gate driver command synchronized with the horizontal synchronization signal of the video signal in the period immediately before the switching. By freezing the video signal immediately before switching over the period from the corresponding line where the command was changed to the vertical sync signal of the video signal after switching, and displaying the video signal one frame before, the video less than one frame period at the time of switching It can be suppressed only to cause signal freeze.
　本発明によれば、テレビ放送のチャンネル切り替えのような異なる同期信号で生成される２種類以上の映像信号を切り替えて液晶ディスプレイパネルに表示する場合に、切り替わり時点で黒映像を挿入することにより生じるブラックアウトや映像乱れが生じることなく、１フレーム期間以下の映像信号のフリーズ発生に抑えることができ、切り替わり時の映像の見え方として違和感の少ない視聴を楽しむことができる。特に、切り替え時点で表示されている映像信号が静止映像であれば、その効果が大きいものである。 According to the present invention, when two or more types of video signals generated by different synchronization signals such as channel switching of a television broadcast are switched and displayed on the liquid crystal display panel, the black video is inserted at the time of switching. It is possible to suppress the occurrence of freezing of the video signal within one frame period without causing blackout or video disturbance, and to enjoy viewing with less sense of incongruity as the video appearance at the time of switching. In particular, if the video signal displayed at the time of switching is a still video, the effect is great.
本発明の実施の形態１における液晶ディスプレイドライバ制御装置のブロック図である。It is a block diagram of the liquid crystal display driver control apparatus in Embodiment 1 of this invention. 図１中の各信号のタイミング図である。It is a timing diagram of each signal in FIG. 本発明の実施の形態２における液晶ディスプレイドライバ制御装置のブロック図である。It is a block diagram of the liquid crystal display driver control apparatus in Embodiment 2 of this invention.
　以下、本発明の実施の形態について、図面を参照しながら説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　《実施の形態１》
　図１は、本発明の実施の形態１における液晶ディスプレイドライバ制御装置及びその制御方法を示す。図１の液晶ディスプレイドライバ制御装置は、液晶ディスプレイパネル１１０を駆動するソースドライバ１０８及びゲートドライバ１０９といった液晶ディスプレイドライバを制御するための装置であって、第１の入力映像信号ＩＮ１を受けて、第１の水平同期信号Ｈ１及び第１の垂直同期信号Ｖ１を抽出して出力する一方、第１の映像データＰ１を出力する第１の入力映像信号処理部１０１と、第２の入力映像信号ＩＮ２を受けて、第２の水平同期信号Ｈ２及び第２の垂直同期信号Ｖ２を抽出して出力する一方、第２の映像データＰ２を出力する第２の入力映像信号処理部１０２と、切り替え指示信号ＣＨ、第１の垂直同期信号Ｖ１、第２の垂直同期信号Ｖ２を元に、ソースドライバ１０８及びゲートドライバ１０９といった液晶ディスプレイドライバへの映像データ及びドライバ制御信号といった出力の切り替え信号ＳＷを生成する一方、ドライバ制御信号の１つであるゲートドライバ１０９に対するコマンドを強制的に変更する第１のコマンド強制変更信号Ｃ１及び第２のコマンド強制変更信号Ｃ２を生成・出力する切り替えタイミング生成部１０３と、第１の水平同期信号Ｈ１、第１の垂直同期信号Ｖ１、第１のコマンド強制変更信号Ｃ１に従って液晶ディスプレイドライバへの第１のドライバ制御信号Ｄ１を生成する第１のドライバ制御信号生成部１０４と、第２の水平同期信号Ｈ２、第２の垂直同期信号Ｖ２、第２のコマンド強制変更信号Ｃ２に従って液晶ディスプレイドライバへの第２のドライバ制御信号Ｄ２を生成する第２のドライバ制御信号生成部１０５と、第１の映像データＰ１と第２の映像データＰ２とを切り替えタイミング生成部１０３から入力される出力切り替え信号ＳＷによって選択切り替えしてソースドライバ１０８への映像データＰを出力する信号選択処理部１０６と、第１のドライバ制御信号Ｄ１と第２のドライバ制御信号Ｄ２とを切り替えタイミング生成部１０３から入力される出力切り替え信号ＳＷによって選択切り替えしてソースドライバ１０８への制御信号ＳＤとゲートドライバ１０９への出力（ゲートドライバコマンドを含む）ＧＤとを出力するドライバ制御信号選択部１０７とで構成されている。 Embodiment 1
FIG. 1 shows a liquid crystal display driver control apparatus and control method thereof according to Embodiment 1 of the present invention. The liquid crystal display driver control device of FIG. 1 is a device for controlling a liquid crystal display driver such as a source driver 108 and a gate driver 109 for driving the liquid crystal display panel 110. The liquid crystal display driver control device shown in FIG. One horizontal synchronizing signal H1 and first vertical synchronizing signal V1 are extracted and output, while a first input video signal processing unit 101 that outputs first video data P1 and a second input video signal IN2 are output. In response, the second horizontal synchronizing signal H2 and the second vertical synchronizing signal V2 are extracted and output, while the second input video signal processing unit 102 that outputs the second video data P2 and the switching instruction signal CH. , A liquid crystal display such as a source driver 108 and a gate driver 109 based on the first vertical synchronizing signal V1 and the second vertical synchronizing signal V2. A first command forced change signal C1 and a first command change signal C1 for forcibly changing a command for the gate driver 109, which is one of the driver control signals, while generating an output switching signal SW such as video data to the driver and a driver control signal. The switch timing generation unit 103 that generates and outputs the second command forced change signal C2, the first horizontal synchronization signal H1, the first vertical synchronization signal V1, and the first command forced change signal C1 according to the first command to the liquid crystal display driver. The first driver control signal generation unit 104 that generates one driver control signal D1, the second horizontal synchronization signal H2, the second vertical synchronization signal V2, and the second command forced change signal C2 are sent to the liquid crystal display driver. A second driver control signal generation unit 105 for generating a second driver control signal D2, and A signal selection processing unit 106 that selectively switches between the video data P1 and the second video data P2 by the output switching signal SW input from the switching timing generation unit 103 and outputs the video data P to the source driver 108; The first driver control signal D1 and the second driver control signal D2 are selectively switched by the output switching signal SW input from the switching timing generation unit 103, and the control signal SD to the source driver 108 and the output to the gate driver 109 ( The driver control signal selection unit 107 outputs GD (including gate driver commands).
　第１の入力映像信号ＩＮ１の選択状態から第２の入力映像信号ＩＮ２の選択状態に切り替える場合、切り替えタイミング生成部１０３は、第２の垂直同期信号Ｖ２に同期したタイミングで出力切り替え信号ＳＷを生成する一方、切り替え指示信号ＣＨの少なくとも次に発生する第１の水平同期信号Ｈ１に同期して第１のコマンド強制変更信号Ｃ１を有効にした後、第２の垂直同期信号Ｖ２に同期して第１のコマンド強制変更信号Ｃ１を無効にする。一方、第２の入力映像信号ＩＮ２の選択状態から第１の入力映像信号ＩＮ１の選択状態に切り替える場合、切り替えタイミング生成部１０３は、第１の垂直同期信号Ｖ１に同期したタイミングで出力切り替え信号ＳＷを生成する一方、切り替え指示信号ＣＨの少なくとも次に発生する第２の水平同期信号Ｈ２に同期して第２のコマンド強制変更信号Ｃ２を有効にした後、第１の垂直同期信号Ｖ１に同期して第２のコマンド強制変更信号Ｃ２を無効にする。 When switching from the selection state of the first input video signal IN1 to the selection state of the second input video signal IN2, the switching timing generation unit 103 generates the output switching signal SW at a timing synchronized with the second vertical synchronization signal V2. On the other hand, after the first command forced change signal C1 is validated in synchronization with the first horizontal synchronization signal H1 generated at least next to the switching instruction signal CH, the first command synchronization change signal C1 is synchronized with the second vertical synchronization signal V2. The command forced change signal C1 of 1 is invalidated. On the other hand, when switching from the selection state of the second input video signal IN2 to the selection state of the first input video signal IN1, the switching timing generation unit 103 outputs the output switching signal SW at a timing synchronized with the first vertical synchronization signal V1. , And the second command forced change signal C2 is made effective in synchronization with the second horizontal synchronization signal H2 generated at least next to the switching instruction signal CH, and then synchronized with the first vertical synchronization signal V1. The second command forced change signal C2 is invalidated.
　第１のドライバ制御信号生成部１０４は、第１の入力映像信号処理部１０１からの第１の水平同期信号Ｈ１及び第１の垂直同期信号Ｖ１と、切り替えタイミング生成部１０３からの第１のコマンド強制変更信号Ｃ１とから、ソースドライバ１０８及びゲートドライバ１０９を駆動するために必要な第１のドライバ制御信号Ｄ１を生成する。ここで、第１のコマンド強制変更信号Ｃ１が無効な状態では、フレーム先頭の第１の水平同期信号Ｈ１のタイミングでスタートコマンド（Ｓ）を、それ以外の第１の水平同期信号Ｈ１のタイミングでは通常コマンド（Ｎ）をそれぞれ生成し、第１のコマンド強制変更信号Ｃ１が有効となる場合には通常コマンド（Ｎ）に代えてシフトレジスタクリアコマンド（Ｃ）を生成する。 The first driver control signal generation unit 104 includes a first horizontal synchronization signal H1 and a first vertical synchronization signal V1 from the first input video signal processing unit 101, and a first command from the switching timing generation unit 103. A first driver control signal D1 necessary to drive the source driver 108 and the gate driver 109 is generated from the forced change signal C1. Here, in a state where the first command forced change signal C1 is invalid, the start command (S) is given at the timing of the first horizontal synchronization signal H1 at the head of the frame, and at the other timings of the first horizontal synchronization signal H1. Each normal command (N) is generated, and when the first command forced change signal C1 becomes valid, a shift register clear command (C) is generated instead of the normal command (N).
　一方、第２のドライバ制御信号生成部１０５は、第２の入力映像信号処理部１０２からの第２の水平同期信号Ｈ２及び第２の垂直同期信号Ｖ２と、切り替えタイミング生成部１０３からの第２のコマンド強制変更信号Ｃ２とから、ソースドライバ１０８及びゲートドライバ１０９を駆動するために必要な第２のドライバ制御信号Ｄ２を生成する。ここで、第２のコマンド強制変更信号Ｃ２が無効な状態では、フレーム先頭の第２の水平同期信号Ｈ２のタイミングでスタートコマンド（Ｓ）を、それ以外の第２の水平同期信号Ｈ２のタイミングでは通常コマンド（Ｎ）をそれぞれ生成し、第２のコマンド強制変更信号Ｃ２が有効となる場合には通常コマンド（Ｎ）に代えてシフトレジスタクリアコマンド（Ｃ）を生成する。 On the other hand, the second driver control signal generation unit 105 receives the second horizontal synchronization signal H2 and the second vertical synchronization signal V2 from the second input video signal processing unit 102, and the second from the switching timing generation unit 103. The second driver control signal D2 necessary for driving the source driver 108 and the gate driver 109 is generated from the command forced change signal C2. Here, in a state where the second command forced change signal C2 is invalid, the start command (S) is given at the timing of the second horizontal synchronization signal H2 at the head of the frame, and at the timing of the other second horizontal synchronization signal H2. Each normal command (N) is generated, and when the second command forced change signal C2 becomes valid, a shift register clear command (C) is generated instead of the normal command (N).
　以上のように構成された液晶ディスプレイドライバ制御装置及びその制御方法について、図２を参照しながら説明する。 The liquid crystal display driver control apparatus configured as described above and its control method will be described with reference to FIG.
　まず、第１の入力映像信号ＩＮ１が第１の入力映像信号処理部１０１に、第２の入力映像信号ＩＮ２が第２の入力映像信号処理部１０２にそれぞれ入力される。これら２つの入力映像信号ＩＮ１，ＩＮ２は、例えばテレビ放送の異なるチャンネルの番組であり、それぞれは水平、垂直同期信号が非同期の関係にある。 First, the first input video signal IN1 is input to the first input video signal processing unit 101, and the second input video signal IN2 is input to the second input video signal processing unit 102, respectively. These two input video signals IN1 and IN2 are, for example, programs of different channels of television broadcasting, and the horizontal and vertical synchronizing signals are asynchronous with each other.
　第１の入力映像信号処理部１０１は、第１の入力映像信号ＩＮ１から第１の水平同期信号Ｈ１、第１の垂直同期信号Ｖ１、第１の映像データＰ１を抽出し、出力する。第２の入力映像信号処理部１０２は、第２の入力映像信号ＩＮ２から第２の水平同期信号Ｈ２、第２の垂直同期信号Ｖ２、第２の映像データＰ２を抽出し、出力する。図２において、時刻ｔ０では第１の垂直同期信号Ｖ１のパルスが第１の入力映像信号ＩＮ１のフレーム先頭を、時刻ｔ３では第２の垂直同期信号Ｖ２のパルスが第２の入力映像信号ＩＮ２のフレーム先頭をそれぞれ示している。 The first input video signal processing unit 101 extracts the first horizontal synchronization signal H1, the first vertical synchronization signal V1, and the first video data P1 from the first input video signal IN1, and outputs them. The second input video signal processing unit 102 extracts the second horizontal synchronization signal H2, the second vertical synchronization signal V2, and the second video data P2 from the second input video signal IN2, and outputs them. In FIG. 2, at time t0, the pulse of the first vertical synchronizing signal V1 is the top of the frame of the first input video signal IN1, and at time t3, the pulse of the second vertical synchronizing signal V2 is the second input video signal IN2. Each frame head is shown.
　切り替えタイミング生成部１０３に入力される切り替え指示信号ＣＨが図２のように時刻ｔ１にてＬｏｗレベルからＨｉｇｈレベルへ立ち上がる信号である場合、第１の入力映像信号ＩＮ１の選択状態から第２の入力映像信号ＩＮ２の選択状態に切り替えることを示している。したがって、切り替えタイミング生成部１０３は、第２の垂直同期信号Ｖ２に同期したタイミングで出力切り替え信号ＳＷを生成する一方、切り替え指示信号ＣＨの少なくとも次に発生する第１の水平同期信号Ｈ１に同期して時刻ｔ２に第１のコマンド強制変更信号Ｃ１を有効にした後、第２の垂直同期信号Ｖ２に同期して時刻ｔ３に第１のコマンド強制変更信号Ｃ１を無効にする。図２の例では第１の入力映像信号ＩＮ１の選択状態から第２の入力映像信号ＩＮ２の選択状態に切り替えるため、第２のコマンド強制変更信号Ｃ２は有効にはならない。 When the switching instruction signal CH input to the switching timing generation unit 103 is a signal that rises from the Low level to the High level at time t1 as shown in FIG. 2, the second input from the selection state of the first input video signal IN1. It shows switching to the selection state of the video signal IN2. Therefore, the switching timing generation unit 103 generates the output switching signal SW at a timing synchronized with the second vertical synchronization signal V2, while synchronizing with the first horizontal synchronization signal H1 generated at least next to the switching instruction signal CH. After the first command forced change signal C1 is validated at time t2, the first command forced change signal C1 is invalidated at time t3 in synchronization with the second vertical synchronization signal V2. In the example of FIG. 2, since the selection state of the first input video signal IN1 is switched to the selection state of the second input video signal IN2, the second command forced change signal C2 is not valid.
　時刻ｔ２から時刻ｔ３までの期間では、第１のコマンド強制変更信号Ｃ１が有効であるので、第１のドライバ制御信号生成部１０４は、通常コマンド（Ｎ）に代えてシフトレジスタクリアコマンド（Ｃ）を第１のドライバ制御信号Ｄ１の一部として生成する。 Since the first command forced change signal C1 is valid during the period from time t2 to time t3, the first driver control signal generation unit 104 uses the shift register clear command (C) instead of the normal command (N). As part of the first driver control signal D1.
　信号選択処理部１０６は、第１の入力映像信号処理部１０１からの第１の映像データＰ１と第２の入力映像信号処理部１０２からの第２の映像データＰ２とを、切り替えタイミング生成部１０３からの出力切り替え信号ＳＷで選択処理し、ソースドライバ１０８へ映像データＰを出力する。 The signal selection processing unit 106 switches the first video data P1 from the first input video signal processing unit 101 and the second video data P2 from the second input video signal processing unit 102 to a switching timing generation unit 103. The video data P is output to the source driver 108 by selection processing using the output switching signal SW.
　ドライバ制御信号選択部１０７は、第１のドライバ制御信号生成部１０４からの第１のドライバ制御信号Ｄ１と第２のドライバ制御信号生成部１０５からの第２のドライバ制御信号Ｄ２とを、切り替えタイミング生成部１０３からの出力切り替え信号ＳＷで選択処理し、ソースドライバ１０８への制御信号ＳＤとゲートドライバ１０９への出力（ゲートドライバコマンドを含む）ＧＤとを出力する。 The driver control signal selection unit 107 switches the first driver control signal D1 from the first driver control signal generation unit 104 and the second driver control signal D2 from the second driver control signal generation unit 105 at the switching timing. A selection process is performed by the output switching signal SW from the generation unit 103, and a control signal SD to the source driver 108 and an output GD (including a gate driver command) GD to the gate driver 109 are output.
　したがって、図２中の時刻ｔ１から時刻ｔ３までの期間では、ゲートドライバ１０９に対しては通常コマンドではなく、強制的に内部のシフトデータを消去するシフトレジスタクリアコマンドに変更して発行されるため、ゲートドライバ１０９の全出力はオフとなることで画面の途中からは表示画面の更新が行われなくなり、第２の入力映像信号ＩＮ２が表示されるまでは、第１の入力映像信号ＩＮ１の前フレームの映像が表示されることになる。 Therefore, during the period from time t1 to time t3 in FIG. 2, it is not a normal command but issued to the gate driver 109 by changing to a shift register clear command for forcibly erasing internal shift data. Since all the outputs of the gate driver 109 are turned off, the display screen is not updated from the middle of the screen, and the first input video signal IN1 is displayed until the second input video signal IN2 is displayed. The frame image will be displayed.
　以上のようなゲートコマンドを強制的に変更する構成により、図２中の時刻ｔ１から時刻ｔ３までの期間で映像信号の不連続性を軽減させることができ、また、従来のような黒データを挿入する構成ではないため、切り替え前後で映像がブラックアウトして見えなくなるという問題も生じない。 With the configuration for forcibly changing the gate command as described above, the discontinuity of the video signal can be reduced during the period from time t1 to time t3 in FIG. Since it is not a structure to insert, there is no problem that the video is blacked out before and after switching.
　《実施の形態２》
　図３は、本発明の実施の形態２における液晶ディスプレイドライバ制御装置及びその制御方法を示す。図３では、図１中の入力映像信号処理部１０１が内部映像信号発生部２０１に置き換えられている。内部映像信号発生部２０１は、入力映像信号ＩＮ２が入力映像信号処理部１０２に入力されない場合を想定してフリーラン動作を行い、第１の水平同期信号Ｈ１及び第１の垂直同期信号Ｖ１を出力する一方、内部生成されたテスト映像データＴ１を出力するものである。切り替えタイミング生成部１０３ａは、切り替え指示信号ＣＨ及び第２の垂直同期信号Ｖ２を元に、出力切り替え信号ＳＷを生成する一方、第１のドライバ制御信号生成部１０４へのコマンド強制変更信号Ｃ１を生成・出力する。第２のドライバ制御信号生成部１０５ａは、コマンド強制変更信号を受け取らず、常に定常動作を行う点で、第１のドライバ制御信号生成部１０４と異なっている。 << Embodiment 2 >>
FIG. 3 shows a liquid crystal display driver control apparatus and control method thereof according to Embodiment 2 of the present invention. In FIG. 3, the input video signal processing unit 101 in FIG. 1 is replaced with an internal video signal generation unit 201. The internal video signal generation unit 201 performs a free-run operation assuming that the input video signal IN2 is not input to the input video signal processing unit 102, and outputs the first horizontal synchronization signal H1 and the first vertical synchronization signal V1. On the other hand, the test video data T1 generated internally is output. The switching timing generation unit 103a generates an output switching signal SW based on the switching instruction signal CH and the second vertical synchronization signal V2, and generates a command forced change signal C1 to the first driver control signal generation unit 104. ·Output. The second driver control signal generation unit 105a is different from the first driver control signal generation unit 104 in that it does not receive a command forced change signal and always performs a steady operation.
　入力映像信号ＩＮ２の供給が開始すると、切り替えタイミング生成部１０３ａに入力される切り替え指示信号ＣＨは、テスト映像データＴ１の選択状態から入力映像データＰ２の選択状態への切り替えを要求する。このとき、実施の形態１の場合と同様に、コマンド強制変更信号Ｃ１が有効となった次の第１の水平同期信号Ｈ１からゲートドライバ１０９に対しては通常コマンドではなく、強制的に内部のシフトデータを消去するシフトレジスタクリアコマンドに変更して発行されるため、ゲートドライバ１０９の全出力はオフとなることで画面の途中からは表示画面の更新が行われなくなり、第２の垂直同期信号Ｖ２が入力されるまでは、内部映像信号発生部２０１のテスト映像データＴ１が表示されることになる。 When the supply of the input video signal IN2 starts, the switching instruction signal CH input to the switching timing generation unit 103a requests switching from the selection state of the test video data T1 to the selection state of the input video data P2. At this time, as in the case of the first embodiment, it is not a normal command to the gate driver 109 from the first horizontal synchronization signal H1 after the command forcible change signal C1 becomes valid, and the internal forced Since the shift register clear command for erasing the shift data is issued and changed, all the outputs of the gate driver 109 are turned off, so that the display screen is not updated from the middle of the screen, and the second vertical synchronization signal Until V2 is input, the test video data T1 of the internal video signal generator 201 is displayed.
　以上のようなゲートコマンドを強制的に変更する構成により、テスト映像データ表示から入力映像データ表示に切り替えた場合に不連続性を軽減させることができ、また、従来のような黒データを挿入する構成ではないため、入力映像信号をすぐ視聴することができ、ブラックアウトして見えなくなる期間が長くなるという問題も生じない。 With the configuration for forcibly changing the gate command as described above, discontinuity can be reduced when switching from the test video data display to the input video data display, and the conventional black data is inserted. Since it is not a configuration, the input video signal can be viewed immediately, and there is no problem that the period during which it is invisible after blacking out becomes long.
　以上説明してきたとおり、本発明に係る液晶ディスプレイドライバ制御装置及びその制御方法は、テレビ放送のチャンネル切り替えのような異なる同期信号で生成される２種類以上の映像信号を切り替えて液晶ディスプレイパネルに表示する場合に、切り替わり時の映像の見え方として違和感が軽減されるので、液晶表示装置に適用して有用である。 As described above, the liquid crystal display driver control apparatus and the control method thereof according to the present invention switch two or more types of video signals generated by different synchronization signals such as television broadcast channel switching and display them on the liquid crystal display panel. In this case, since the sense of incongruity is reduced as the way the video is viewed at the time of switching, it is useful when applied to a liquid crystal display.
１０１，１０２　入力映像信号処理部
１０３，１０３ａ　切り替えタイミング生成部
１０４，１０５，１０５ａ　ドライバ制御信号生成部
１０６　信号選択処理部
１０７　ドライバ制御信号選択部
１０８　ソースドライバ
１０９　ゲートドライバ
１１０　液晶ディスプレイパネル
２０１　内部映像信号発生部 101, 102 Input video signal processing units 103, 103a Switching timing generation units 104, 105, 105a Driver control signal generation unit 106 Signal selection processing unit 107 Driver control signal selection unit 108 Source driver 109 Gate driver 110 Liquid crystal display panel 201 Internal video signal Generator

Claims (5)

  1. 　液晶ディスプレイパネルを駆動するソースドライバ及びゲートドライバを制御するための液晶ディスプレイドライバ制御装置であって、
    　第１の映像データに係る第１の水平同期信号及び第１の垂直同期信号を元に、第１のゲートドライバコマンドを含む第１のドライバ制御信号を生成する第１のドライバ制御信号生成部と、
    　第２の映像データに係る第２の水平同期信号及び第２の垂直同期信号を元に、第２のゲートドライバコマンドを含む第２のドライバ制御信号を生成する第２のドライバ制御信号生成部と、
    　前記第１の映像データから前記第２の映像データへの切り替えを要求する切り替え指示信号を元に、前記第２の垂直同期信号のタイミングで出力切り替え信号を生成する切り替えタイミング生成部と、
    　前記出力切り替え信号を元に、前記第２の垂直同期信号のタイミングで、前記第１の映像データから前記第２の映像データへ切り替えて前記ソースドライバへ出力する信号選択処理部と、
    　前記出力切り替え信号を元に、前記第２の垂直同期信号のタイミングで、前記第１のドライバ制御信号から前記第２のドライバ制御信号へ切り替えて前記ソースドライバ及び前記ゲートドライバへ出力するドライバ制御信号選択部とを備え、
    　前記切り替えタイミング生成部は、前記切り替え指示信号が与えられてから前記出力切り替え信号が生成されるまでの期間では、前記第１の水平同期信号に同期して生成される前記第１のゲートドライバコマンドを強制的に変更制御する信号を前記第１のドライバ制御信号生成部へ供給することを特徴とする液晶ディスプレイドライバ制御装置。     A liquid crystal display driver control device for controlling a source driver and a gate driver for driving a liquid crystal display panel,
    A first driver control signal generation unit configured to generate a first driver control signal including a first gate driver command based on a first horizontal synchronization signal and a first vertical synchronization signal related to the first video data; ,
    A second driver control signal generation unit for generating a second driver control signal including a second gate driver command based on the second horizontal synchronization signal and the second vertical synchronization signal related to the second video data; ,
    A switching timing generator for generating an output switching signal at the timing of the second vertical synchronization signal based on a switching instruction signal for requesting switching from the first video data to the second video data;
    A signal selection processing unit that switches from the first video data to the second video data at the timing of the second vertical synchronization signal based on the output switching signal and outputs the second video data to the source driver;
    A driver control signal that switches from the first driver control signal to the second driver control signal and outputs to the source driver and the gate driver at the timing of the second vertical synchronization signal based on the output switching signal With a selection unit,
    The switching timing generation unit generates the first gate driver command generated in synchronization with the first horizontal synchronization signal in a period from when the switching instruction signal is given to when the output switching signal is generated. A liquid crystal display driver control device, characterized in that a signal for forcibly changing is supplied to the first driver control signal generator.
  2. 　請求項１記載の液晶ディスプレイドライバ制御装置において、
    　第１の入力映像信号を受けて、前記第１の映像データと、前記第１の水平同期信号と、前記第１の垂直同期信号とを出力する第１の入力映像信号処理部と、
    　第２の入力映像信号を受けて、前記第２の映像データと、前記第２の水平同期信号と、前記第２の垂直同期信号とを出力する第２の入力映像信号処理部とを更に備えたことを特徴とする液晶ディスプレイドライバ制御装置。     The liquid crystal display driver control device according to claim 1,
    A first input video signal processing unit that receives the first input video signal and outputs the first video data, the first horizontal synchronization signal, and the first vertical synchronization signal;
    A second input video signal processing unit that receives the second input video signal and outputs the second video data, the second horizontal synchronization signal, and the second vertical synchronization signal; A liquid crystal display driver control device.
  3. 　請求項１記載の液晶ディスプレイドライバ制御装置において、
    　フリーラン動作により、前記第１の映像データと、前記第１の水平同期信号と、前記第１の垂直同期信号とを出力する内部映像信号発生部と、
    　入力映像信号を受けて、前記第２の映像データと、前記第２の水平同期信号と、前記第２の垂直同期信号とを出力する入力映像信号処理部とを更に備えたことを特徴とする液晶ディスプレイドライバ制御装置。     The liquid crystal display driver control device according to claim 1,
    An internal video signal generator for outputting the first video data, the first horizontal synchronization signal, and the first vertical synchronization signal by a free-run operation;
    And an input video signal processing unit that receives the input video signal and outputs the second video data, the second horizontal synchronization signal, and the second vertical synchronization signal. Liquid crystal display driver control device.
  4. 　請求項１記載の液晶ディスプレイドライバ制御装置において、
    　前記切り替えタイミング生成部は、前記切り替え指示信号が与えられてから前記出力切り替え信号が生成されるまでの期間では、前記第１の水平同期信号に同期して生成される前記第１のゲートドライバコマンドを通常コマンドからシフトレジスタクリアコマンドへ強制的に変更制御する信号を前記第１のドライバ制御信号生成部へ供給することを特徴とする液晶ディスプレイドライバ制御装置。     The liquid crystal display driver control device according to claim 1,
    The switching timing generation unit generates the first gate driver command generated in synchronization with the first horizontal synchronization signal in a period from when the switching instruction signal is given to when the output switching signal is generated. A liquid crystal display driver control apparatus, characterized in that a signal for forcibly controlling the change from a normal command to a shift register clear command is supplied to the first driver control signal generator.
  5. 　液晶ディスプレイパネルを駆動するソースドライバ及びゲートドライバを制御するための液晶ディスプレイドライバ制御方法であって、
    　第１の映像データに係る第１の水平同期信号及び第１の垂直同期信号を元に、第１のゲートドライバコマンドを含む第１のドライバ制御信号を生成する第１のドライバ制御信号生成ステップと、
    　第２の映像データに係る第２の水平同期信号及び第２の垂直同期信号を元に、第２のゲートドライバコマンドを含む第２のドライバ制御信号を生成する第２のドライバ制御信号生成ステップと、
    　前記第１の映像データから前記第２の映像データへの切り替えを要求する切り替え指示信号を元に、前記第２の垂直同期信号のタイミングで出力切り替え信号を生成する切り替えタイミング生成ステップと、
    　前記出力切り替え信号を元に、前記第２の垂直同期信号のタイミングで、前記第１の映像データから前記第２の映像データへ切り替えて前記ソースドライバへ出力する信号選択処理ステップと、
    　前記出力切り替え信号を元に、前記第２の垂直同期信号のタイミングで、前記第１のドライバ制御信号から前記第２のドライバ制御信号へ切り替えて前記ソースドライバ及び前記ゲートドライバへ出力するドライバ制御信号選択ステップとを備え、
    　前記切り替え指示信号が与えられてから前記出力切り替え信号が生成されるまでの期間では、前記第１の水平同期信号に同期して生成される前記第１のゲートドライバコマンドを通常コマンドからシフトレジスタクリアコマンドへ強制的に変更制御することを特徴とする液晶ディスプレイドライバ制御方法。     A liquid crystal display driver control method for controlling a source driver and a gate driver for driving a liquid crystal display panel,
    A first driver control signal generating step for generating a first driver control signal including a first gate driver command based on the first horizontal synchronizing signal and the first vertical synchronizing signal related to the first video data; ,
    A second driver control signal generation step of generating a second driver control signal including a second gate driver command based on the second horizontal synchronization signal and the second vertical synchronization signal related to the second video data; ,
    A switching timing generation step for generating an output switching signal at the timing of the second vertical synchronization signal based on a switching instruction signal for requesting switching from the first video data to the second video data;
    A signal selection processing step of switching from the first video data to the second video data and outputting to the source driver at the timing of the second vertical synchronization signal based on the output switching signal;
    A driver control signal that switches from the first driver control signal to the second driver control signal and outputs to the source driver and the gate driver at the timing of the second vertical synchronization signal based on the output switching signal A selection step,
    In a period from when the switching instruction signal is given to when the output switching signal is generated, the first gate driver command generated in synchronization with the first horizontal synchronizing signal is shifted from the normal command to the shift register clear. A liquid crystal display driver control method characterized by forcibly controlling change to a command.
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