JPS63174017A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPS63174017A JPS63174017A JP62007040A JP704087A JPS63174017A JP S63174017 A JPS63174017 A JP S63174017A JP 62007040 A JP62007040 A JP 62007040A JP 704087 A JP704087 A JP 704087A JP S63174017 A JPS63174017 A JP S63174017A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- liquid crystal
- image
- display device
- crystal display
- 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.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 22
- 230000010287 polarization Effects 0.000 claims description 7
- 230000002269 spontaneous effect Effects 0.000 claims description 6
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134336—Matrix
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は液晶表示装置、特に強誘電性液晶の表示装置
において、表示画像に階調を持たせた表示を行う液晶表
示装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device, particularly a ferroelectric liquid crystal display device, which displays images with gradations.
「従来の技術」
従来、平面表示装置としてツィステッド・ネマティック
液晶（以下、ＴＮ型液晶と記す）等を用いたマトリクス
状に画素を配列した液晶表示装置が開発され、利用され
てぎた。しかし、これらＴＮ型液晶では、画素への駆動
電圧を切るとＯＮＮ状悪態らＯＦＦ状態に短時間に戻る
特性を右することから、表示する画素が増える、づなわ
ち、表示画面の水平走査線が増えると、下方の走査線を
走査している間に、上方の走査線の表示画素が消えかか
るようになりコントラストが低下する問題を有していた
。従って、走査によって、画素に印加した駆１’、Ｉｔ
電圧が消えても印加電圧を紺持し、液晶の作動を保持づ
るためにトランジスタ等の制御回路を画素毎に設けたア
クティブマトリクス駆動方式の液晶表示装置が開発され
ているが製作が複雑であり高価である欠点を有していた
。これに対し、分子の長軸方向に対し垂直の自発分極を
有し、この自発分極と反対の向きに電界を加えることに
より自発分極の向きが反転し光学特性が変化すると共に
、画素を１回駆動すると駆動電圧を切ってもその状態を
維持する、いわゆる、双安定性を有する強誘電性液晶が
開発され、この双安定性のため前記のようなコントラス
トの低下の問題は解決されたが液晶それ自体は単に０Ｎ
−ＯＦＦのスイッチングを行うのみであり、そのため表
示画素に中間調の表示の機能を右さないため階調のある
映像を表示することができなかった。"Prior Art" Conventionally, a liquid crystal display device in which pixels are arranged in a matrix using twisted nematic liquid crystal (hereinafter referred to as TN type liquid crystal) or the like has been developed and used as a flat display device. However, in these TN type liquid crystals, when the driving voltage to the pixels is cut off, the characteristic of returning from an ON state to an OFF state in a short time increases the number of pixels to be displayed, which means that the horizontal scanning line of the display screen increases. When the number increases, there is a problem in that while the lower scanning line is being scanned, the display pixels of the upper scanning line begin to disappear, resulting in a decrease in contrast. Therefore, by scanning, the voltage applied to the pixel is 1', It
Active matrix drive type liquid crystal display devices have been developed in which a control circuit such as a transistor is provided for each pixel in order to maintain the applied voltage and maintain the operation of the liquid crystal even when the voltage is turned off, but it is complicated to manufacture. It had the disadvantage of being expensive. On the other hand, it has spontaneous polarization perpendicular to the long axis direction of the molecule, and by applying an electric field in the opposite direction to this spontaneous polarization, the direction of the spontaneous polarization is reversed, the optical characteristics change, and the pixel is Ferroelectric liquid crystals have been developed that have so-called bistability, which maintains their state even when the driving voltage is cut off. itself is just 0N
-OFF switching is performed, and therefore, the display pixel does not have the function of displaying halftones, making it impossible to display images with gradations.
「発明が解決しようとする問題点」゛
本発明は、従来において、単に透光（ＯＮ）−遮光（Ｏ
ＦＦ）のスイッチインクのみのｉｌｌしか有していない
液晶表示装置では、テレビジョンの映＆等を表示すると
単に明暗の強調されたモザイク状の画像表示となり、中
間調の画像の表示が要望されていた。従って、本発明は
、表示される映像の階調に対応し、中間調のある表示を
（１う（１能を持った液晶表示装置を提供するものであ
る。``Problem to be solved by the invention'' ``In the past, the present invention was made by simply transmitting light (ON) - blocking light (O
With a liquid crystal display device that has only the illumination of switch ink (FF), when displaying television images, etc., it simply displays a mosaic-like image with emphasis on brightness and darkness, and there is no desire to display images in intermediate tones. Ta. Accordingly, the present invention provides a liquid crystal display device capable of displaying a display with halftones corresponding to the gradation of a displayed image.
「問題点を解決するための手段」
本発明は、液晶表示装置に中間調の表示機能を持たせる
ため、各画素の一方の電極を複数の電極群に分割し、表
示される映像の階調信号をディジタル化した信号に変換
し、ディジタル信号の各桁毎それぞれの電極に別個に印
加し、ディジタル化された映像の階調に対応し、分割さ
れた各電極を個別に駆動制ｎＪることによって、作動す
る液晶の作動面積を制御し、中間調のある画像を表示ず
“る液晶表示装置を提供するものである。``Means for Solving the Problems'' In order to provide a liquid crystal display device with a halftone display function, the present invention divides one electrode of each pixel into a plurality of electrode groups, and provides a method for gradation of displayed images. Converts the signal into a digitized signal, applies it to each electrode separately for each digit of the digital signal, and drives each divided electrode individually in accordance with the gradation of the digitized image. Accordingly, the present invention provides a liquid crystal display device that controls the operating area of the liquid crystal and does not display images with halftones.
「作用」
表示される映像の階調信号をディジタル化し、複数に分
割された電極のそれぞれにディジタル化した２進数の各
桁の信号をそれぞれ別個に分割された各電極に直接印加
することにより、表示する映像のｉ８調に対応して、分
割されたＴｉ掻が制御され、液晶の作動面積を制御ｌす
るもので、中間調のある表示画面を得るものである。"Operation" By digitizing the gradation signal of the displayed image and directly applying the signal of each digit of the digitized binary number to each of the divided electrodes, The divided Ti strips are controlled in accordance with the i8 tone of the image to be displayed, and the operating area of the liquid crystal is controlled to obtain a display screen with halftones.
「実施例」
以下、図面に湛づいて本発明を説明する。第１図は、液
晶表示装置のマトリクスの駆動回路の例で、垂直走査線
Ｘｉ 、Ｘ２・・・・・・Ｘｎおよび水平走査線Ｙ１
、Ｙ２・・・・・・Ｙｍとで構成する。画定査線の各交
点には画素Ｄ１１、Ｄ２１、［） ３１−ｆ・・・・Ｄ
ｎｌ、Ｄ１２、［）２２・・・・・・Ｄｎｍが配設さ
れている。垂直（Ｘ）、水平（Ｙ）の各走査線に走査信
号が印加されるとそれぞれ順次走査され、対応する交点
の画素に駆動電圧が印加され該当する画素作動し、光を
遮光するく電圧の印加により液晶の光軸が回転し、偏向
フィルタを介し光が遮断される）ことで表示がなされる
。第２図は本発明による電極の構成を示すを示す図で、
上部走査線Ｙ （Ｙｌ 、Ｙ２・・・に相当）と下部走
査線Ｘ （Ｘｌ 、Ｘ２・・・に相当）とで構成されて
いる。水平走査線Ｙの電極は図から明らかなように、Ｙ
ｌａｌＹｌｂｌＹｌＣの３つに分割され、それぞれ電極
面積１．２．３を有している。"Example" The present invention will be described below with reference to the drawings. FIG. 1 shows an example of a driving circuit for a matrix of a liquid crystal display device, including vertical scanning lines Xi, X2...Xn and a horizontal scanning line Y1.
, Y2...Ym. Pixels D11, D21, [) 31-f...D are located at each intersection of the defining scanning lines.
nl, D12, [)22...Dnm are arranged. When a scanning signal is applied to each of the vertical (X) and horizontal (Y) scanning lines, they are sequentially scanned, and a driving voltage is applied to the pixel at the corresponding intersection, activating the corresponding pixel, and increasing the voltage to block light. The optical axis of the liquid crystal is rotated by the application of light, and the light is blocked through the polarization filter, thereby producing a display. FIG. 2 is a diagram showing the structure of the electrode according to the present invention.
It is composed of an upper scanning line Y (corresponding to Yl, Y2, . . .) and a lower scanning line X (corresponding to Xl, X2, . . .). As is clear from the figure, the electrodes of the horizontal scanning line Y
It is divided into three parts: lalYlblYlC, each having an electrode area of 1.2.3.
一方、垂直走査線の電極Ｘは前記水平走査線の分割され
た電極の全てをカバーしうる電極面積を有するように構
成される。On the other hand, the electrode X of the vertical scanning line is configured to have an electrode area that can cover all of the divided electrodes of the horizontal scanning line.
このように構成において、表示される映像の階調信号の
ディジタル化された信号は、例えば、第３図に示すよう
な３ビツトの２進数信号であるならば、表示される映像
の階調のディジタル信号の第１桁を’ｙ’ｌａ走査線に
、第２桁をＹ１ｂ走査線に、そして第３桁をＹＩＣ走査
線にそれぞれ直接印加することにより、表示される映像
信号の階調信口は第４図にて示す如く、各電極に個別に
印加される。In this configuration, if the digitized signal of the gradation signal of the displayed image is, for example, a 3-bit binary signal as shown in FIG. By directly applying the first digit of the digital signal to the 'y'la scanning line, the second digit to the Y1b scanning line, and the third digit to the YIC scanning line, the gradation input of the displayed video signal is determined. is applied to each electrode individually as shown in FIG.
図中、斜線のある電極部分は作動中の電甑を示している
。例えば、第４図（ａ ）は、電極１のみが′作８する
階調２（第３図の表参照）の表示を、同図（ｂ）は、電
極１と電極２とが作動する階調４の表示を、同図（Ｃ）
は、電極１と電極３とが作動する階調６の表示を行う如
くに映像の階調に対応して作動面積を制御する。この実
施例では８階調の画体を表示することができる。また、
分割された電極の面積は２進数のディジタル信号の各桁
の数値、例えば、電極１の面積を基準面積とし、１［２
の面積を電極１の面積の略２倍の面積に、電極３の面積
を電極１の面積の略４倍に対応するにうに設定するなら
ば、前記説明したディジタル化された階調信号に対応し
、元の映像に近似した階調を有する画面を表示すること
ができる。これらの作用は、液晶が双安定性を有する強
誘電性液晶を使用することで可能となるものである。す
なわち、画素に印加する駆ｆ７１電圧が切れても、液晶
の作動状態が次の走査まで保持する特性を利用すること
で可能とするものである。なお、この説明では、電極を
３分割および分割した電極の面積を２進数の桁数の数値
に設定した例で説明したが、本発明はこれに限定される
ものでなく、適宜に変更しても本願発明の効果を得るも
のである。In the figure, the diagonally shaded electrode portion shows the electric oven in operation. For example, FIG. 4(a) shows the display at gradation 2 (see the table in FIG. 3) where only electrode 1 operates, and FIG. 4(b) shows the display at gradation 2 where electrode 1 and electrode 2 operate. The display of key 4 is shown in the same figure (C).
controls the operating area in accordance with the gradation of the image so that electrode 1 and electrode 3 are activated to display gradation 6. In this embodiment, an image with eight gradations can be displayed. Also,
The area of the divided electrodes is the numerical value of each digit of the binary digital signal, for example, the area of electrode 1 is used as the reference area, and the area is 1[2
If the area of is set to correspond to approximately twice the area of electrode 1, and the area of electrode 3 is set to correspond to approximately four times the area of electrode 1, it corresponds to the digitized grayscale signal described above. However, it is possible to display a screen with gradation similar to the original video. These effects are made possible by using a ferroelectric liquid crystal that has bistability. That is, this is made possible by utilizing the characteristic that the operating state of the liquid crystal is maintained until the next scan even if the driving f71 voltage applied to the pixel is cut off. In addition, in this explanation, an example has been explained in which the electrode is divided into three parts and the area of the divided electrode is set to a numerical value of the number of binary digits, but the present invention is not limited to this, and can be modified as appropriate. Also, the effects of the present invention can be obtained.
「効果」
以上の如く、本発明によれば、従来のアクティブマトリ
クス方式等のような複雑で高価な方法を用いいることな
く、画素の駆動電極を一方を複数に分割し、分割された
電極のそれぞれに表示される映像の階調信号をディジタ
ル化し、そのディジタル信号の各桁を直接それぞれの電
極に接続し、階調信号を印加することにより、表示され
る映像を忠実に再現し、良好な画像を表示しうるしので
あり、その利用価値は大きいものである。"Effects" As described above, according to the present invention, one side of the drive electrode of a pixel is divided into a plurality of parts, and the divided electrodes are By digitizing the gradation signal of the image displayed on each, connecting each digit of the digital signal directly to each electrode, and applying the gradation signal, the displayed image can be faithfully reproduced and a good quality signal can be obtained. It is used to display images, and its utility value is great.
第１図は本発明による液晶表示装置のマトリクスの駆動
回路、第２図は本発明の一実施例の電極の分割を示す図
、第３図は映像信号の階調を表示するためのチャート図
、第４図は本発明による液晶表示装置の１画素を例とし
た階調の表示例を示す図である。
図中、Ｘｌ 、Ｘ２ ・ｉｔ垂直走査線、Ｙｌ 、Ｙ２
・・・は水平走査線、［）１１、Ｄ２１・・・は画素、
ＹｌａｌＹｌｌ）、Ｙｌｃは走査線Ｙ１の分割された各
走査線、１．２．３は分割された走査線の各電極である
。
特許出願人 株式会社富士通ゼネラル第１図
処２図FIG. 1 is a matrix drive circuit of a liquid crystal display device according to the present invention, FIG. 2 is a diagram showing the division of electrodes in an embodiment of the present invention, and FIG. 3 is a chart diagram for displaying the gradation of a video signal. , FIG. 4 is a diagram showing an example of gray scale display using one pixel of the liquid crystal display device according to the present invention. In the figure, Xl, X2 ・it vertical scanning line, Yl, Y2
... is a horizontal scanning line, [)11, D21... is a pixel,
YlalYll), Ylc are each divided scanning line of the scanning line Y1, and 1.2.3 are each electrode of the divided scanning line. Patent applicant Fujitsu General Ltd. Figure 1 Figure 2
Claims (3)
方向に対し垂直に自発分極を有し、自発分極と反対の向
きに電界を加えるため前記電極に駆動電圧を印加し、該
駆動電圧により自発分極の向きが反転し光学特性が変化
することを利用する強誘電性液晶表示装置において、一
方の電極を複数の電極群に分割する手段と、分割された
複数の電極のそれぞれに表示する映像の階調に対応する
適宜の駆動電圧をそれぞれに印加することを特徴とする
液晶表示装置。(1) It is sandwiched between one electrode and the other electrode and has spontaneous polarization perpendicular to the long axis direction of the molecule, and a driving voltage is applied to the electrode in order to apply an electric field in the opposite direction to the spontaneous polarization. In a ferroelectric liquid crystal display device that utilizes the fact that the direction of spontaneous polarization is reversed by a driving voltage and the optical characteristics change, there is a means for dividing one electrode into a plurality of electrode groups, and a means for dividing each of the plurality of divided electrodes. A liquid crystal display device characterized in that an appropriate drive voltage corresponding to the gradation of an image to be displayed is applied to each.
表示される映像の階調信号のディジタル化された信号で
あることを特徴とした特許請求の範囲第１項記載の液晶
表示装置。(2) The liquid crystal display device according to claim 1, wherein the driving voltage applied to each of the divided electrodes is a digitized signal of a gradation signal of an image to be displayed.
桁の数値に対応する面積に設定されていることを特徴と
した特許請求の範囲第１項記載の液晶表示装置。(3) The liquid crystal display device according to claim 1, wherein the area of each of the divided electrodes is set to an area corresponding to a binary digit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62007040A JPS63174017A (en) | 1987-01-14 | 1987-01-14 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62007040A JPS63174017A (en) | 1987-01-14 | 1987-01-14 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63174017A true JPS63174017A (en) | 1988-07-18 |
Family
ID=11654933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62007040A Pending JPS63174017A (en) | 1987-01-14 | 1987-01-14 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63174017A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1795948A1 (en) * | 2004-09-30 | 2007-06-13 | Sharp Kabushiki Kaisha | Liquid crystal display |
-
1987
- 1987-01-14 JP JP62007040A patent/JPS63174017A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1795948A1 (en) * | 2004-09-30 | 2007-06-13 | Sharp Kabushiki Kaisha | Liquid crystal display |
| EP1795948A4 (en) * | 2004-09-30 | 2008-11-05 | Sharp Kk | Liquid crystal display |
| US7782346B2 (en) | 2004-09-30 | 2010-08-24 | Sharp Kabushiki Kaisha | Liquid crystal display |
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