JP2003005152A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JP2003005152A
JP2003005152A JP2001190931A JP2001190931A JP2003005152A JP 2003005152 A JP2003005152 A JP 2003005152A JP 2001190931 A JP2001190931 A JP 2001190931A JP 2001190931 A JP2001190931 A JP 2001190931A JP 2003005152 A JP2003005152 A JP 2003005152A
Authority
JP
Japan
Prior art keywords
liquid crystal
circuit
image
signal
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2001190931A
Other languages
Japanese (ja)
Inventor
Takeshi Terasawa
毅 寺沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2001190931A priority Critical patent/JP2003005152A/en
Publication of JP2003005152A publication Critical patent/JP2003005152A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • 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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0213—Addressing of scan or signal lines controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time

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

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device consuming low power. SOLUTION: When the liquid crystal display device displays a picture, odd- numbered signal lines 4 are connected with a column driving circuit 9 by change- over switches 5, and when it displays the next picture, even-numbered signal lines 4 are connected with the column driving circuit 9 by the change-over switches 5. Therefore, a plurality of the signal lines 4 is thinned out to half to drive so that the circuit scale of the analog column driving circuit can be made to half and the power consumption can be reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】この発明は液晶表示装置に関
し、特に、画像を表示するための液晶表示装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device for displaying an image.

【０００２】[0002]

【従来の技術】従来より、ブラウン管を用いた画像表示
装置では、水平走査線を間引いて駆動する方式が知られ
ている。そこで、液晶表示装置においても、水平走査線
を間引いて駆動することにより、消費電力の低減化を図
る方法が考えられる。2. Description of the Related Art Conventionally, in an image display apparatus using a cathode ray tube, a method of driving by thinning out horizontal scanning lines is known. Therefore, also in the liquid crystal display device, a method of reducing the power consumption can be considered by thinning and driving the horizontal scanning lines.

【０００３】図７は、そのような液晶表示装置の構成を
示す回路ブロック図である。図７において、この液晶表
示装置は、制御回路３１、液晶パネル３２、行ドライバ
回路３６および列ドライバ回路３９を備える。制御回路
３１は、外部から与えられる画像信号に従って液晶表示
装置全体を制御する。FIG. 7 is a circuit block diagram showing the structure of such a liquid crystal display device. 7, this liquid crystal display device includes a control circuit 31, a liquid crystal panel 32, a row driver circuit 36, and a column driver circuit 39. The control circuit 31 controls the entire liquid crystal display device according to an image signal given from the outside.

【０００４】液晶パネル３２は、図中横方向に延在する
複数（図では６つ）の走査線３３と、図中縦方向に延在
する複数（図では６つ）の信号線３４と、各隣接する２
本の走査線３３に対応して設けられた切換スイッチ３５
とを含む。走査線３３と信号線３４の各交差部には画素
（図示せず）が配置されている。切換スイッチ３５は、
１つの画像が液晶パネル３２に表示されるごとに交互に
切換えられる。The liquid crystal panel 32 has a plurality of (six in the figure) scanning lines 33 extending in the horizontal direction in the figure, and a plurality of (six in the figure) signal lines 34 extending in the vertical direction in the figure. Each adjacent 2
Changeover switch 35 provided corresponding to the scanning line 33 of the book
Including and Pixels (not shown) are arranged at the intersections of the scanning lines 33 and the signal lines 34. The changeover switch 35 is
Each time one image is displayed on the liquid crystal panel 32, it is switched alternately.

【０００５】行ドライバ回路３６は、シフトレジスタ３
７およびレベルシフト回路３８を含み、切換スイッチ３
５で選択された複数（図では３つ）の走査線３３を一定
時間ずつ順次選択レベルの「Ｈ」レベルにする。「Ｈ」
レベルにされた走査線３３に対応する各画素は活性化さ
れる。The row driver circuit 36 includes a shift register 3
7 and a level shift circuit 38, and a changeover switch 3
The plurality of (three in the figure) scanning lines 33 selected in 5 are sequentially set to the selection level “H” level for a certain period of time. "H"
Each pixel corresponding to the leveled scan line 33 is activated.

【０００６】列ドライバ回路３９は、データレジスタ＋
ラッチ回路４０、レベルシフト回路４１および複数（図
では６つ）のＤ／Ａコンバータ４２を含み、活性化され
た各画素に画像電位を与える。各画素の光透過率は、画
像電位のレベルに応じて変化する。このようにして、奇
数番または偶数番の行の各画素に画像電位を与えること
により、液晶パネル３２に１つの画像が表示される。The column driver circuit 39 includes a data register +
It includes a latch circuit 40, a level shift circuit 41, and a plurality (six in the figure) of D / A converters 42, and applies an image potential to each activated pixel. The light transmittance of each pixel changes according to the level of the image potential. In this way, one image is displayed on the liquid crystal panel 32 by applying an image potential to each pixel in the odd-numbered or even-numbered rows.

【０００７】この液晶表示装置によれば、複数の走査線
３３を１／２に間引いて駆動するので、間引かない場合
に比べて行ドライバ回路３６の構成要素数を小さくする
ことができ、消費電力が小さくて済む。According to this liquid crystal display device, the plurality of scanning lines 33 are decimated to one half for driving, so that the number of constituent elements of the row driver circuit 36 can be reduced as compared with the case where no thinning is performed, and the consumption is reduced. It requires less power.

【０００８】[0008]

【発明が解決しようとする課題】しかし、行ドライバ回
路３６は行を順次選択するものであり、デジタル回路で
構成されるので、その消費電力は行の切換時のみに発生
し、液晶表示装置全体の消費電力に占める割合は小さ
い。このため、複数の走査線３３を１／２に間引いて駆
動しても、液晶表示装置全体の消費電力の低減化は十分
でなかった。However, since the row driver circuit 36 is for sequentially selecting rows and is composed of a digital circuit, its power consumption is generated only when the rows are switched, and the entire liquid crystal display device. Of power consumption is small. Therefore, even if the plurality of scanning lines 33 are decimated to ½ and driven, reduction in power consumption of the entire liquid crystal display device is not sufficient.

【０００９】それゆえに、この発明の主たる目的は、消
費電力が小さな液晶表示装置を提供することである。Therefore, a main object of the present invention is to provide a liquid crystal display device with low power consumption.

【００１０】[0010]

【課題を解決するための手段】この発明に係る液晶表示
装置は、画像を表示するための液晶表示装置であって、
複数行複数列に配置され、各々の光透過率がその制御ノ
ードに与えられた画像電位に応じて変化する複数の液晶
セルと、それぞれ複数行に対応して設けられた複数の走
査線と、それぞれ複数列に対応して設けられ、それぞれ
がＮ本（ただし、Ｎは２以上の整数である）の信号線を
含む複数の第１グループに分割された複数の信号線と、
１つの画像を表示するごとに複数の走査線を一定時間ず
つ順次選択する行ドライバ回路と、各第１グループに対
応して設けられて１つの画像を表示するごとに切換えら
れ、対応の第１グループに含まれるＮ本の信号線を順次
選択する第１切換回路と、各第１切換回路に対応して設
けられ、画像信号に従って、対応の第１切換回路によっ
て選択された信号線を介して行ドライバ回路によって選
択された走査線に対応する液晶セルの制御ノードに画像
電位を与える列ドライバ回路とを備えたものである。A liquid crystal display device according to the present invention is a liquid crystal display device for displaying an image,
A plurality of liquid crystal cells arranged in a plurality of rows and a plurality of columns, each light transmittance of which changes in accordance with an image potential given to the control node, and a plurality of scanning lines provided corresponding to the plurality of rows, respectively. A plurality of signal lines provided corresponding to a plurality of columns, each of which is divided into a plurality of first groups including N signal lines (where N is an integer of 2 or more);
A row driver circuit that sequentially selects a plurality of scanning lines for a certain period of time each time one image is displayed, and a row driver circuit that is provided corresponding to each first group and is switched each time one image is displayed. A first switching circuit that sequentially selects N signal lines included in a group, and a first switching circuit that is provided corresponding to each first switching circuit and that is selected by the corresponding first switching circuit according to an image signal. A column driver circuit for applying an image potential to the control node of the liquid crystal cell corresponding to the scanning line selected by the row driver circuit.

【００１１】好ましくは、複数の走査線は、それぞれが
Ｍ本（ただし、Ｍは２以上の整数である）の走査線を含
む複数の第２グループに分割される。さらに、各第２グ
ループに対応して設けられて１つの画像を表示するごと
に切換えられ、対応の第２グループに含まれるＭ本の走
査線を順次選択する第２切換回路が設けられ、行ドライ
バ回路は、第２切換回路によって選択された走査線のみ
を選択する。Preferably, the plurality of scan lines are divided into a plurality of second groups each including M (where M is an integer of 2 or more) scan lines. Further, a second switching circuit which is provided corresponding to each of the second groups and is switched each time one image is displayed, and which sequentially selects the M scanning lines included in the corresponding second group is provided. The driver circuit selects only the scanning line selected by the second switching circuit.

【００１２】また好ましくは、さらに、第１および第２
の信号のうちのいずれか一方の信号を予め定められた周
期でランダムに出力する乱数発生回路が設けられ、列ド
ライバ回路は、乱数発生回路から第１の信号が出力され
たことに応じて画像電位を正極性にし、第２の信号が出
力されたことに応じて画像電位を負極性にする。Further preferably, further, the first and second
A random number generation circuit that randomly outputs one of the signals in a predetermined cycle is provided, and the column driver circuit is configured to display an image in response to the first signal output from the random number generation circuit. The potential is made positive and the image potential is made negative in response to the output of the second signal.

【００１３】[0013]

【発明の実施の形態】［実施の形態１］図１は、この発
明の実施の形態１による液晶表示装置の構成を示す回路
ブロック図である。[First Embodiment] FIG. 1 is a circuit block diagram showing a structure of a liquid crystal display device according to a first embodiment of the present invention.

【００１４】図１において、この液晶表示装置は、制御
回路１、液晶パネル２、行ドライバ回路６および列ドラ
イバ回路９を備える。制御回路１は、外部から与えられ
る画像信号に従って画像データ信号、クロック信号、種
々の内部制御信号を生成し、液晶表示装置全体を制御す
る。In FIG. 1, the liquid crystal display device includes a control circuit 1, a liquid crystal panel 2, a row driver circuit 6 and a column driver circuit 9. The control circuit 1 generates an image data signal, a clock signal, and various internal control signals according to an image signal given from the outside, and controls the entire liquid crystal display device.

【００１５】液晶パネルには、図中横方向に延在する複
数の走査線３と、図中縦方向に延在する複数の信号線４
とを含む。走査線３および信号線４は、実際には多数設
けられているが、図１では図面の簡単化のため６本ずつ
示されている。走査線３と信号線の各交差部には、図２
に示すように画素１５が配置されている。In the liquid crystal panel, a plurality of scanning lines 3 extending in the horizontal direction in the figure and a plurality of signal lines 4 extending in the vertical direction in the figure.
Including and Although a large number of scanning lines 3 and signal lines 4 are actually provided, in FIG. 1, six lines are shown for simplification of the drawing. At each intersection of the scanning line 3 and the signal line, as shown in FIG.
Pixels 15 are arranged as shown in FIG.

【００１６】画素１５は、信号線４と基準電位ＶＳＳの
ラインとの間に直列接続されたＮ型ＴＦＴ（Thin Film
Transistor）１６およびキャパシタ１７と、キャパシタ
１７に並列接続された液晶セル１８とを含む。Ｎ型ＴＦ
Ｔ１６のゲートは、走査線３に接続されている。The pixel 15 is an N-type TFT (Thin Film) connected in series between the signal line 4 and the line of the reference potential VSS.
Transistor 16 and capacitor 17, and liquid crystal cell 18 connected in parallel with capacitor 17. N type TF
The gate of T16 is connected to the scanning line 3.

【００１７】走査線３が選択レベルの「Ｈ」レベルにさ
れると、Ｎ型ＴＦＴ１６が導通し、Ｎ型ＴＦＴ１６とキ
ャパシタ１７の間のノードＮ１６に信号線４の電位が与
えられる。液晶セル１８の光透過率は、ノードＮ１６の
電位と基準電位ＶＳＳとの間の電位差に応じて変化す
る。When the scanning line 3 is set to the "H" level of the selection level, the N-type TFT 16 becomes conductive and the potential of the signal line 4 is applied to the node N16 between the N-type TFT 16 and the capacitor 17. The light transmittance of the liquid crystal cell 18 changes according to the potential difference between the potential of the node N16 and the reference potential VSS.

【００１８】図１に戻って、液晶パネルには、さらに、
各隣接する２本の信号線４に対応して設けられた切換ス
イッチ５を含む。切換スイッチ５の供給端子は列ドライ
バ回路９の出力信号を受け、その２つの切換端子は対応
の２本の信号線５の一方端にそれぞれ接続されている。
切換スイッチ５は、制御回路１からの信号φＳ１によっ
て制御され、信号φＳ１が「Ｌ」レベルの場合は列ドラ
イバ回路９の出力信号を奇数番の信号線４に与え、信号
φＳ１が「Ｈ」レベルの場合は列ドライバ回路９の出力
信号を偶数番の信号線４に与える。信号φＳ１のレベル
は、液晶パネル２に１つの画像が表示されるごとに切換
えられる。Returning to FIG. 1, the liquid crystal panel further includes
The changeover switch 5 provided corresponding to each two adjacent signal lines 4 is included. The supply terminal of the changeover switch 5 receives the output signal of the column driver circuit 9, and the two changeover terminals are respectively connected to one ends of the corresponding two signal lines 5.
The changeover switch 5 is controlled by the signal φS1 from the control circuit 1. When the signal φS1 is at the “L” level, the output signal of the column driver circuit 9 is applied to the odd-numbered signal line 4 and the signal φS1 is at the “H” level. In the case of, the output signal of the column driver circuit 9 is applied to the even-numbered signal lines 4. The level of the signal φS1 is switched every time one image is displayed on the liquid crystal panel 2.

【００１９】行ドライバ回路６は、シフトレジスタ７お
よびレベルシフト回路８を含む。シフトレジスタ７は、
それぞれ６本の走査線３に対応する６つのパルス信号を
所定周期で順次生成する。レベルシフト回路８は、シフ
トレジスタ７からの各パルス信号の信号レベルを所定の
レベル（「Ｈ」レベル）に変換して対応の走査線３に与
える。したがって、６本の走査線３は、１つの画像が表
示されるごとに所定時間ずつ順次「Ｈ」レベルにされ
る。Row driver circuit 6 includes a shift register 7 and a level shift circuit 8. The shift register 7 is
Six pulse signals respectively corresponding to the six scanning lines 3 are sequentially generated at a predetermined cycle. The level shift circuit 8 converts the signal level of each pulse signal from the shift register 7 into a predetermined level (“H” level) and supplies it to the corresponding scanning line 3. Therefore, the six scanning lines 3 are sequentially set to the “H” level for a predetermined time each time one image is displayed.

【００２０】列ドライバ回路９は、データレジスタ＋ラ
ッチ回路１０、レベルシフト回路１１および３つのＤ／
Ａコンバータ１２を含む。データレジスタ＋ラッチ回路
１０は、制御回路１から与えられる画像データ信号を順
次取込み、１走査線３分の画像データ信号を取込んだこ
とに応じて、それらの画像データ信号をレベルシフト回
路１１に与える。レベルシフト回路１１は、データレジ
スタ＋ラッチ回路１０からの各画像データ信号の信号レ
ベルを所定のレベルに変換して対応のＤ／Ａコンバータ
１２に与える。Ｄ／Ａコンバータ１２は、レベルシフト
回路１１からのデータ信号を画像電位に変換して対応の
切換スイッチ５の共通端子に与える。The column driver circuit 9 includes a data register + latch circuit 10, a level shift circuit 11 and three D / s.
The A converter 12 is included. The data register + latch circuit 10 sequentially takes in the image data signals supplied from the control circuit 1, and in response to taking in the image data signals for one scanning line, these image data signals are sent to the level shift circuit 11. give. The level shift circuit 11 converts the signal level of each image data signal from the data register + latch circuit 10 into a predetermined level and gives it to the corresponding D / A converter 12. The D / A converter 12 converts the data signal from the level shift circuit 11 into an image potential and supplies it to the common terminal of the corresponding changeover switch 5.

【００２１】次に、この液晶表示装置の動作について説
明する。切換スイッチ５は、１つの画像が表示されるご
とに交互に切換えられる。すなわち、ある画像を表示す
る場合は、信号φＳ１が「Ｈ」レベルにされ、Ｄ／Ａコ
ンバータ１２の出力ノードは切換スイッチ５を介して奇
数番の信号線４に接続される。この状態で、行ドライバ
回路６によって６本の走査線３が所定周期で一定時間ず
つ順次「Ｈ」レベルにされる。走査線３が「Ｈ」レベル
にされると、その行の各画素１５のＮ型ＴＦＴ１６が導
通する。これに同期して、１行分（図１では３つ）の画
像データ信号がデータレジスタ＋ラッチ回路１０からレ
ベルシフト回路１１を介して３つのＡ／Ｄコンバータ１
２に与えられ、Ｄ／Ａコンバータ１２の出力電位が対応
の画素１６のノードＮ１６に与えられる。このようにし
て、奇数番の列の各画素１５に画像電位が与えられ、液
晶パネル２には１つの画像が表示される。Next, the operation of this liquid crystal display device will be described. The changeover switch 5 is alternately switched every time one image is displayed. That is, when displaying a certain image, the signal φS1 is set to the “H” level, and the output node of the D / A converter 12 is connected to the odd-numbered signal line 4 via the changeover switch 5. In this state, the row driver circuit 6 sequentially sets the six scanning lines 3 to the “H” level for a predetermined period of time in a predetermined cycle. When the scanning line 3 is set to the “H” level, the N-type TFT 16 of each pixel 15 in that row becomes conductive. In synchronization with this, image data signals for one row (three in FIG. 1) are transferred from the data register + latch circuit 10 to the three A / D converters 1 via the level shift circuit 11.
2 and the output potential of the D / A converter 12 is applied to the node N16 of the corresponding pixel 16. In this way, the image potential is applied to each pixel 15 in the odd-numbered columns, and one image is displayed on the liquid crystal panel 2.

【００２２】次の画像を表示する場合は、信号φＳ１が
「Ｌ」レベルにされ、Ｄ／Ａコンバータ１２の出力ノー
ドが切換スイッチ５を介して偶数番の信号線４に接続さ
れる。この状態で、行ドライバ回路６によって６本の走
査線３が所定周期で一定時間ずつ順次「Ｈ」レベルにさ
れるとともに、列ドライバ回路９によって画像データ信
号に応じたレベルの画像電位が各画素１５に与えられ
る。このようにして、偶数番の列の各画素１５に画像電
位が与えられ、液晶パネル２には次の画像が表示され
る。When displaying the next image, the signal φS1 is set to the "L" level, and the output node of the D / A converter 12 is connected to the even-numbered signal line 4 via the changeover switch 5. In this state, the row driver circuit 6 sequentially sets the six scanning lines 3 to the “H” level for a certain period of time in a predetermined cycle, and the column driver circuit 9 sets the image potential at a level corresponding to the image data signal to each pixel. Given to 15. In this way, the image potential is applied to each pixel 15 in the even-numbered columns, and the next image is displayed on the liquid crystal panel 2.

【００２３】この実施の形態１では、複数の信号線４を
１／２に間引いて駆動するので、列ドライバ回路９の回
路規模を従来の１／２にすることができ、液晶表示装置
の消費電力を大幅に小さくすることができる。すなわ
ち、列ドライバ回路９は、画素１５の輝度の階調を連続
的に変えるためにアナログ回路で構成される。一般にア
ナログ回路はバイアス電流などを必要とするため消費電
力が大きく、しかも画素選択期間中、出力電位を一定に
維持する必要があるので、列ドライバ回路９の消費電力
は行ドライバ回路６の消費電力に比べてかなり大きくな
る。したがって、列ドライバ回路９の消費電力が液晶表
示装置全体の消費電力に占める割合が高いので、列ドラ
イバ回路９の回路規模を１／２にすることにより、液晶
表示装置の消費電力を大幅に小さくすることができる。In the first embodiment, since the plurality of signal lines 4 are decimated to ½ and driven, the circuit scale of the column driver circuit 9 can be halved as compared with the conventional one, and the liquid crystal display device can be consumed. The power can be significantly reduced. That is, the column driver circuit 9 is composed of an analog circuit for continuously changing the gradation of the luminance of the pixel 15. Generally, an analog circuit consumes a large amount of power because it requires a bias current, and moreover, it is necessary to maintain a constant output potential during the pixel selection period. It will be considerably larger than. Therefore, since the power consumption of the column driver circuit 9 is high in the power consumption of the entire liquid crystal display device, the power consumption of the liquid crystal display device can be significantly reduced by halving the circuit scale of the column driver circuit 9. can do.

【００２４】なお、図３に示すように、さらに、走査線
３を間引いて駆動するための切換スイッチ２０を設けて
もよい。切換スイッチ２０は、各隣接する２本の走査線
３に対応して設けられる。切換スイッチ２０の共通端子
は行ドライバ回路６′の出力信号を受け、その２つの切
換端子は対応の２本の走査線３の一方端にそれぞれ接続
される。切換スイッチ２０は、制御回路１′からの信号
φＳ２によって制御され、信号φＳ２が「Ｈ」レベルの
場合は行ドライバ回路６′の出力信号を奇数番の走査線
３に与え、信号φＳ２が「Ｌ」レベルの場合は行ドライ
バ回路６′の出力信号を偶数番の走査線３に与える。As shown in FIG. 3, a changeover switch 20 for thinning and driving the scanning lines 3 may be further provided. The changeover switch 20 is provided corresponding to each two adjacent scanning lines 3. The common terminal of the changeover switch 20 receives the output signal of the row driver circuit 6 ', and the two changeover terminals are connected to one ends of the corresponding two scanning lines 3, respectively. The changeover switch 20 is controlled by the signal φS2 from the control circuit 1 ', and when the signal φS2 is at "H" level, the output signal of the row driver circuit 6'is applied to the odd-numbered scanning lines 3 and the signal φS2 is changed to "L". , The output signal of the row driver circuit 6'is applied to the even-numbered scanning lines 3.

【００２５】切換スイッチ２０は、１つの画像を表示す
るごとに交互に切換えられる。すなわち、ある画像を表
示する場合は、信号φＳ２が「Ｈ」レベルにされ、行ド
ライバ回路６′の３つの出力ノードは３つの切換スイッ
チ２０を介して奇数番の走査線３に接続される。これに
より、奇数番の３本の走査線３が所定周期で一定時間ず
つ順次「Ｈ」レベルにされる。走査線３が「Ｈ」レベル
にされるのと同期して奇数番の信号線４に画像電位が与
えられる。このようにして、奇数番の走査線３と奇数番
の信号線４との交差部にある各画素１５に画像電位が与
えられ、液晶パネル２′には１つの画像が表示される。The changeover switch 20 is alternately switched every time one image is displayed. That is, when displaying a certain image, the signal φS2 is set to the "H" level, and the three output nodes of the row driver circuit 6'are connected to the odd-numbered scanning lines 3 via the three changeover switches 20. As a result, the odd-numbered three scanning lines 3 are sequentially set to the “H” level for a certain period of time in a predetermined cycle. The image potential is applied to the odd-numbered signal lines 4 in synchronization with the scanning line 3 being set to the “H” level. In this way, an image potential is applied to each pixel 15 at the intersection of the odd scan line 3 and the odd signal line 4, and one image is displayed on the liquid crystal panel 2 '.

【００２６】次の画像を表示する場合は、信号φＳ２が
「Ｌ」レベルにされ、行ドライバ回路６′の３つの出力
ノードは３つの切換スイッチ２０を介して偶数番の走査
線３に接続される。これにより、偶数番の３本の走査線
３が所定周期で一定時間ずつ順次「Ｈ」レベルにされる
とともに、偶数番の信号線４に画像電位が与えられる。
このようにして、偶数番の走査線３と偶数番の信号線４
との交差部にある各画素１５に画像電位が与えられ、液
晶パネル２′には次の画像が表示される。When displaying the next image, the signal φS2 is set to the "L" level, and the three output nodes of the row driver circuit 6'are connected to the even-numbered scanning lines 3 through the three changeover switches 20. It As a result, the even-numbered three scanning lines 3 are sequentially set to the “H” level for a fixed period of time in a predetermined cycle, and the image potential is applied to the even-numbered signal lines 4.
In this way, the even scan lines 3 and the even signal lines 4
An image potential is applied to each pixel 15 at the intersection with and the next image is displayed on the liquid crystal panel 2 '.

【００２７】この変更例では、信号線４と走査線３の両
方を間引いて駆動するので、間引かない場合に比べて行
ドライバ回路６′および列ドライバ回路９の回路規模を
１／２にすることができ、消費電力を大幅に小さくする
ことができる。In this modified example, both the signal lines 4 and the scanning lines 3 are thinned out and driven, so that the circuit scale of the row driver circuit 6'and the column driver circuit 9 is halved compared to the case where they are not thinned out. Therefore, the power consumption can be significantly reduced.

【００２８】［実施の形態２］液晶セル１８に直流電圧
を印加し続けると液晶が劣化するので、液晶セル１８の
印加電圧の極性は交互に切換える必要がある。従来は、
図４に示すように、規則的なパターンで液晶セル１８の
印加電圧の極性を切換えていた。図４において、白抜き
の四角は正の電圧が印加されたセル１８を含む画素１５
を示し、斜線が施された四角は負の電圧を否かされたセ
ル１８を含む画素１５を示している。横方向および縦方
向に隣接する２つの画素１５のセル１８には、互いに異
なる極性の電圧が印加される。画素１５のセル１８の印
加電圧の極性は、前回印加された電圧の極性と異なる極
性にされる。これにより、液晶の劣化が防止される。[Second Embodiment] Since the liquid crystal deteriorates when a DC voltage is continuously applied to the liquid crystal cell 18, it is necessary to switch the polarity of the voltage applied to the liquid crystal cell 18 alternately. conventionally,
As shown in FIG. 4, the polarity of the voltage applied to the liquid crystal cell 18 was switched in a regular pattern. In FIG. 4, a white square indicates a pixel 15 including a cell 18 to which a positive voltage is applied.
The shaded squares indicate the pixels 15 including the cells 18 that have been denied a negative voltage. Voltages having polarities different from each other are applied to the cells 18 of the two pixels 15 adjacent to each other in the horizontal direction and the vertical direction. The polarity of the voltage applied to the cell 18 of the pixel 15 is made different from the polarity of the previously applied voltage. Thereby, the deterioration of the liquid crystal is prevented.

【００２９】ところで、液晶セル１８の印加電圧の極性
が正の場合と負の場合で印加電圧の絶対値を完全に一致
させることは困難であるので、印加電圧の絶対値の差に
よる輝度ムラが生じる。また、従来の液晶表示装置の画
面更新周波数は６０Ｈｚであることが多い。極性反転
は、画面更新ごとに行なうため、その周波数は画面更新
周波数の１／２の３０Ｈｚになる。一般に、３０Ｈｚ程
度の変化には人間の目が追従しないので、極性反転に伴
う輝度ムラは視認され難い。しかし、実施の形態１で
は、各画素の更新周波数は従来例の１／２の３０Ｈｚに
なり、極性反転周波数は従来の１／２の１５Ｈｚにな
る。人間の目は１５Ｈｚ程度の変化に追従するので、こ
の場合は極性反転による輝度ムラが視認される。特に、
規則正しく１５Ｈｚで輝度が変化すると、輝度ムラが強
調される。しかし、輝度ムラが発生する時間と場所をラ
ンダムに変化させれば、輝度ムラの規則性が弱まり、視
覚上のフリッカのレベルを下げることができる。そこ
で、この実施の形態２では、図５に示すように、液晶セ
ル１８の印加電圧の極性を反転させるパターンを不規則
にしてフリッカのレベルを低減させる。By the way, it is difficult to completely match the absolute values of the applied voltage when the polarity of the applied voltage to the liquid crystal cell 18 is positive and when the polarity is negative. Occurs. Further, the screen update frequency of the conventional liquid crystal display device is often 60 Hz. Since the polarity inversion is performed every time the screen is updated, the frequency becomes 30 Hz, which is half the screen update frequency. Generally, since the human eye does not follow the change of about 30 Hz, it is difficult to visually recognize the uneven brightness due to the polarity reversal. However, in the first embodiment, the update frequency of each pixel is 1/2, which is 30 Hz, and the polarity inversion frequency is 1/2, which is 15 Hz, which is conventional. Since the human eye follows a change of about 15 Hz, in this case, uneven brightness due to polarity reversal is visually recognized. In particular,
When the brightness changes regularly at 15 Hz, the uneven brightness is emphasized. However, if the time and place where the brightness unevenness occurs are randomly changed, the regularity of the brightness unevenness is weakened, and the visual flicker level can be lowered. Therefore, in the second embodiment, as shown in FIG. 5, the pattern for reversing the polarity of the voltage applied to the liquid crystal cell 18 is made irregular to reduce the flicker level.

【００３０】図６は、この発明の実施の形態２による液
晶表示装置の要部を示すブロック図である。図６におい
て、この液晶表示装置では、図１の列ドライバ回路９内
に分周回路２１、乱数発生回路２２および極性設定回路
２３が設けられる。FIG. 6 is a block diagram showing a main part of a liquid crystal display device according to the second embodiment of the present invention. 6, in this liquid crystal display device, a frequency dividing circuit 21, a random number generating circuit 22 and a polarity setting circuit 23 are provided in the column driver circuit 9 of FIG.

【００３１】分数発生回路２１は、データレジスタ＋ラ
ッチ回路１０を制御するためのクロック信号ＣＬＫを２
分周してクロック信号ＣＬＫＬを生成する。乱数発生回
路２２は、クロック信号ＣＬＫＬの各立上がりエッジお
よび各立上がりエッジに応答して、信号φ２２をランダ
ムに「Ｈ」レベル（１）または「Ｌ」レベル（０）にす
る。極性設定回路２３は、信号φ２２が「Ｈ」レベルの
場合はデータレジスタ＋ラッチ回路１０からの画像デー
タ信号ＤＩに正極性であることを示す信号を付加し、信
号φ２２が「Ｌ」レベルの場合は画像データ信号ＤＩに
負極性であることを示す信号を付加する。極性を示す信
号が付加された画像データ信号ＤＩは、レベルシフト回
路１１ａを介してＤ／Ａコンバータ１２に与えられる。
Ｄ／Ａコンバータ１２は、極性を示す信号が付加された
画像データ信号ＤＩに従って、その極性の画像電位ＶＩ
を生成する。他の構成および動作は、実施の形態１の液
晶表示装置と同じであるので、その説明は繰返さない。The fraction generation circuit 21 outputs a clock signal CLK for controlling the data register + latch circuit 10 to 2
The frequency is divided to generate the clock signal CLKL. Random number generation circuit 22 randomly sets signal φ22 to "H" level (1) or "L" level (0) in response to each rising edge and each rising edge of clock signal CLKL. The polarity setting circuit 23 adds a signal indicating the positive polarity to the image data signal DI from the data register + latch circuit 10 when the signal φ22 is at “H” level, and when the signal φ22 is at “L” level. Adds a signal indicating the negative polarity to the image data signal DI. The image data signal DI to which the signal indicating the polarity is added is given to the D / A converter 12 via the level shift circuit 11a.
The D / A converter 12 follows the image potential VI of the polarity according to the image data signal DI to which the signal indicating the polarity is added.
To generate. Other configurations and operations are the same as those of the liquid crystal display device of the first embodiment, and therefore description thereof will not be repeated.

【００３２】この実施の形態２では、液晶セル１８の印
加電圧の極性を反転させるパターンを不規則にするの
で、走査線３や信号線４を間引いて駆動することにより
発生するフリッカのレベルを小さく抑えることができ
る。In the second embodiment, since the pattern for reversing the polarity of the voltage applied to the liquid crystal cell 18 is irregular, the level of flicker generated by thinning and driving the scanning lines 3 and the signal lines 4 is small. Can be suppressed.

【００３３】今回開示された実施の形態はすべての点で
例示であって制限的なものではないと考えられるべきで
ある。本発明の範囲は上記した説明ではなくて特許請求
の範囲によって示され、特許請求の範囲と均等の意味お
よび範囲内でのすべての変更が含まれることが意図され
る。The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

【００３４】[0034]

【発明の効果】以上のように、この発明に係る液晶表示
装置では、複数の液晶セルと、複数の走査線と、それぞ
れがＮ本の信号線を含む複数の第１グループに分割され
た複数の信号線と、１つの画像を表示するごとに複数の
走査線を一定時間ずつ順次選択する行ドライバ回路と、
各第１グループに対応して設けられて１つの画像を表示
するごとに切換えられ、対応の第１グループに含まれる
Ｎ本の信号線を順次選択する第１切換回路と、各第１切
換回路に対応して設けられ、画像信号に従って、対応の
第１切換回路によって選択された信号線を介して行ドラ
イバ回路によって選択された走査線に対応する液晶セル
の制御ノードに画像電位を与える列ドライバ回路とが設
けられる。したがって、複数の信号線を１／Ｎに間引い
て駆動するので、列ドライバ回路の回路規模を１／Ｎに
することができ、消費電力の低減化を図ることができ
る。As described above, in the liquid crystal display device according to the present invention, a plurality of liquid crystal cells, a plurality of scanning lines, and a plurality of first groups each including N signal lines are provided. And a row driver circuit that sequentially selects a plurality of scanning lines for a fixed time each time one image is displayed,
A first switching circuit which is provided corresponding to each first group and is switched every time one image is displayed, and sequentially selects N signal lines included in the corresponding first group, and each first switching circuit. A column driver that is provided corresponding to the image signal and applies an image potential to the control node of the liquid crystal cell corresponding to the scanning line selected by the row driver circuit via the signal line selected by the corresponding first switching circuit according to the image signal. And a circuit are provided. Therefore, the plurality of signal lines are thinned to 1 / N for driving, so that the circuit scale of the column driver circuit can be reduced to 1 / N, and the power consumption can be reduced.

【００３５】好ましくは、複数の走査線は、それぞれが
Ｍ本の走査線を含む複数の第２グループに分割され、さ
らに、各第２グループに対応して設けられて１つの画像
を表示するごとに切換えられ、対応の第２グループに含
まれるＭ本の走査線を順次選択する第２切換回路が設け
られ、行ドライバ回路は、第２切換回路によって選択さ
れた走査線のみを選択する。この場合は、さらに、複数
の走査線を１／Ｍに間引いて駆動するので、行ドライバ
回路の回路規模を１／Ｍにすることができ、消費電力の
一層の低減化を図ることができる。Preferably, the plurality of scanning lines are divided into a plurality of second groups each including M scanning lines, and each scanning line is provided corresponding to each second group to display one image. A second switching circuit is provided for sequentially selecting M scanning lines included in the corresponding second group, and the row driver circuit selects only the scanning line selected by the second switching circuit. In this case, since the plurality of scanning lines are thinned out to 1 / M for driving, the circuit scale of the row driver circuit can be reduced to 1 / M, and the power consumption can be further reduced.

【００３６】また好ましくは、さらに、第１および第２
の信号のうちのいずれか一方の信号を予め定められた周
期でランダムに出力する乱数発生回路が設けられ、列ド
ライバ回路は、乱数発生回路から第１の信号が出力され
たことに応じて画像電位を正極性にし、第２の信号が出
力されたことに応じて画像電位を負極性にする。この場
合は、液晶セルの印加電圧の極性を反転させるパターン
を不規則にするので、走査線や信号線を間引いて駆動す
ることによって発生するフリッカのレベルを小さくする
ことができる。Further preferably, further, the first and second
A random number generation circuit that randomly outputs one of the signals in a predetermined cycle is provided, and the column driver circuit is configured to display an image in response to the first signal output from the random number generation circuit. The potential is made positive and the image potential is made negative in response to the output of the second signal. In this case, since the pattern for inverting the polarity of the voltage applied to the liquid crystal cell is irregular, it is possible to reduce the level of flicker generated by thinning and driving the scanning lines and signal lines.

【図面の簡単な説明】[Brief description of drawings]

【図１】 この発明の実施の形態１による液晶表示装置
の構成を示す回路ブロック図である。FIG. 1 is a circuit block diagram showing a configuration of a liquid crystal display device according to a first embodiment of the present invention.

【図２】 図１に示した液晶パネルに含まれる画素の構
成を示す回路図である。2 is a circuit diagram showing a configuration of a pixel included in the liquid crystal panel shown in FIG.

【図３】 実施の形態１の変更例を示す回路ブロック図
である。FIG. 3 is a circuit block diagram showing a modification of the first embodiment.

【図４】 この発明の実施の形態２による液晶表示装置
の原理を説明するための図である。FIG. 4 is a diagram for explaining the principle of a liquid crystal display device according to a second embodiment of the present invention.

【図５】 図４で説明した液晶表示装置の原理を説明す
るための他の図である。FIG. 5 is another diagram for explaining the principle of the liquid crystal display device described in FIG.

【図６】 図５で説明した液晶表示装置の具体的構成を
示すブロック図である。6 is a block diagram showing a specific configuration of the liquid crystal display device described in FIG.

【図７】 従来の液晶表示装置の構成を示す回路ブロッ
ク図である。FIG. 7 is a circuit block diagram showing a configuration of a conventional liquid crystal display device.

【符号の説明】[Explanation of symbols]

１，１′，３１ 制御回路、２，２′，３２ 液晶パネ
ル、３，３３ 走査線、４，３４ 信号線、５，２０，
３５ 切換スイッチ、６，６′，３６ 行ドライバ回
路、７，７′，３７ シフトレジスタ、８，８′，１
１，１１ａ，３８，４１ レベルシフト回路、９，３９
列ドライバ回路、１０，４０ データレジスタ＋ラッ
チ回路、１２，４２ Ｄ／Ａコンバータ、２１ 分周回
路、２２ 乱数発生回路、２３ 極性設定回路。1, 1 ', 31 control circuit, 2, 2', 32 liquid crystal panel, 3, 33 scanning line, 4, 34 signal line, 5, 20,
35 changeover switch, 6, 6 ', 36 row driver circuit, 7, 7', 37 shift register, 8, 8 ', 1
1, 11a, 38, 41 level shift circuit, 9, 39
Column driver circuit, 10,40 data register + latch circuit, 12,42 D / A converter, 21 frequency dividing circuit, 22 random number generating circuit, 23 polarity setting circuit.

フロントページの続き Ｆターム(参考） 2H093 NA31 NC22 NC26 NC41 ND10 ND39 5C006 AF42 AF43 BB14 BB16 BC03 BC11 BF24 FA47 5C080 AA10 BB06 DD26 FF11 JJ01 JJ02 Continued front page    F term (reference) 2H093 NA31 NC22 NC26 NC41 ND10                       ND39                 5C006 AF42 AF43 BB14 BB16 BC03                       BC11 BF24 FA47                 5C080 AA10 BB06 DD26 FF11 JJ01                       JJ02

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 画像を表示するための液晶表示装置であ
って、 複数行複数列に配置され、各々の光透過率がその制御ノ
ードに与えられた画像電位に応じて変化する複数の液晶
セル、 それぞれ前記複数行に対応して設けられた複数の走査
線、 それぞれ複数列に対応して設けられ、それぞれがＮ本
（ただし、Ｎは２以上の整数である）の信号線を含む複
数の第１グループに分割された複数の信号線、 １つの画像を表示するごとに前記複数の走査線を一定時
間ずつ順次選択する行ドライバ回路、 各第１グループに対応して設けられて１つの画像を表示
するごとに切換えられ、対応の第１グループに含まれる
Ｎ本の信号線を順次選択する第１切換回路、および各第
１切換回路に対応して設けられ、画像信号に従って、対
応の第１切換回路によって選択された信号線を介して前
記行ドライバ回路によって選択された走査線に対応する
液晶セルの制御ノードに画像電位を与える列ドライバ回
路を備える、液晶表示装置。1. A liquid crystal display device for displaying an image, comprising a plurality of liquid crystal cells arranged in a plurality of rows and a plurality of columns, each light transmittance of which changes according to an image potential applied to its control node. , A plurality of scanning lines provided corresponding to the plurality of rows, a plurality of scanning lines provided corresponding to a plurality of columns, each of which includes N signal lines (where N is an integer of 2 or more). A plurality of signal lines divided into a first group, a row driver circuit that sequentially selects the plurality of scanning lines for a fixed time each time one image is displayed, and one image provided for each first group Is provided for each of the first switching circuits and the first switching circuits for sequentially selecting the N signal lines included in the corresponding first group and each of the first switching circuits. 1 Selectable by switching circuit It has been through the signal line comprises a column driver circuit for applying an image electric potential to the control node of the liquid crystal cells corresponding to the scanning line selected by the row driver circuit, a liquid crystal display device. 【請求項２】 前記複数の走査線は、それぞれがＭ本
（ただし、Ｍは２以上の整数である）の走査線を含む複
数の第２グループに分割され、 さらに、各第２グループに対応して設けられて１つの画
像を表示するごとに切換えられ、対応の第２グループに
含まれるＭ本の走査線を順次選択する第２切換回路を備
え、 前記行ドライバ回路は、前記第２切換回路によって選択
された走査線のみを選択する、請求項１に記載の液晶表
示装置。2. The plurality of scan lines are divided into a plurality of second groups each including M (where M is an integer of 2 or more) scan lines, and further correspond to each second group. And a second switching circuit for switching each time one image is displayed and sequentially selecting M scanning lines included in the corresponding second group. The row driver circuit includes the second switching circuit. The liquid crystal display device according to claim 1, wherein only the scanning line selected by the circuit is selected. 【請求項３】 さらに、第１および第２の信号のうちの
いずれか一方の信号を予め定められた周期でランダムに
出力する乱数発生回路を備え、 前記列ドライバ回路は、前記乱数発生回路から第１の信
号が出力されたことに応じて前記画像電位を正極性に
し、第２の信号が出力されたことに応じて前記画像電位
を負極性にする、請求項１または請求項２に記載の液晶
表示装置。3. A random number generation circuit for randomly outputting one of the first and second signals at a predetermined cycle, wherein the column driver circuit is provided with a random number generation circuit from the random number generation circuit. The image potential is made positive in response to the output of the first signal, and the image potential is made negative in response to the output of the second signal. Liquid crystal display device.
JP2001190931A 2001-06-25 2001-06-25 Liquid crystal display device Withdrawn JP2003005152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001190931A JP2003005152A (en) 2001-06-25 2001-06-25 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001190931A JP2003005152A (en) 2001-06-25 2001-06-25 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JP2003005152A true JP2003005152A (en) 2003-01-08

Family

ID=19029627

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001190931A Withdrawn JP2003005152A (en) 2001-06-25 2001-06-25 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JP2003005152A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005049838A (en) * 2003-07-30 2005-02-24 Samsung Sdi Co Ltd Display device and driving method thereof
JP2008311118A (en) * 2007-06-15 2008-12-25 Aitesu:Kk Driving device and driving method of organic el element
US8587509B2 (en) 2008-11-28 2013-11-19 Sharp Kabushiki Kaisha Display device and drive method for driving the same
EP3163558A4 (en) * 2014-06-26 2017-12-13 Boe Technology Group Co. Ltd. Display panel driving method and driving circuit, and display device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005049838A (en) * 2003-07-30 2005-02-24 Samsung Sdi Co Ltd Display device and driving method thereof
US8243057B2 (en) 2003-07-30 2012-08-14 Samsung Mobile Display Co., Ltd. Display and driving method thereof
JP2008311118A (en) * 2007-06-15 2008-12-25 Aitesu:Kk Driving device and driving method of organic el element
US8587509B2 (en) 2008-11-28 2013-11-19 Sharp Kabushiki Kaisha Display device and drive method for driving the same
EP3163558A4 (en) * 2014-06-26 2017-12-13 Boe Technology Group Co. Ltd. Display panel driving method and driving circuit, and display device
US10013911B2 (en) 2014-06-26 2018-07-03 Boe Technology Group Co., Ltd. Driving method and driving circuit of display panel and display device

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Effective date: 20080902