JPH05100627A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH05100627A JPH05100627A JP25914591A JP25914591A JPH05100627A JP H05100627 A JPH05100627 A JP H05100627A JP 25914591 A JP25914591 A JP 25914591A JP 25914591 A JP25914591 A JP 25914591A JP H05100627 A JPH05100627 A JP H05100627A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- image
- circuit section
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 100
- 239000000758 substrate Substances 0.000 claims description 9
- 238000007786 electrostatic charging Methods 0.000 abstract 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 11
- 230000006866 deterioration Effects 0.000 description 4
- 239000004988 Nematic liquid crystal Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、駆動回路部の残留電荷
に起因する表示むらの問題を解消して高画質な画像表示
を実現した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 which realizes high-quality image display by solving the problem of display unevenness due to residual charges in a drive circuit section.
【０００２】[0002]
【従来の技術】液晶表示装置は、一般に液晶表示素子と
それを駆動するための液晶駆動回路とでその主要部が構
成されている。液晶駆動回路は、外部からロジック信号
として入力される画像信号を受けて液晶印加信号発生回
路部を制御するロジック回路部と、そのロジック回路部
に制御されて液晶印加信号を発生しこれを液晶表示素子
に印加する液晶印加信号発生回路部と、この液晶印加信
号発生回路部の印加電圧の基調となるバイアス電圧を発
生し供給するバイアス電圧発生回路部とを有している。2. Description of the Related Art A liquid crystal display device generally comprises a liquid crystal display element and a liquid crystal drive circuit for driving the same as a main portion thereof. The liquid crystal drive circuit receives an image signal input as a logic signal from the outside and controls a liquid crystal application signal generation circuit section, and a logic circuit section which is controlled by the logic circuit section to generate a liquid crystal application signal and display it. It has a liquid crystal application signal generation circuit section applied to the element and a bias voltage generation circuit section which generates and supplies a bias voltage which is the basis of the applied voltage of the liquid crystal application signal generation circuit section.
【０００３】このような液晶表示装置において、液晶表
示素子をオン状態からオフ状態にスイッチングすると
き、それまでのオン状態の間に前述の液晶駆動回路の各
回路部や配線部に蓄積された電荷は、オフ状態になった
後も残留する。この残留電荷が液晶印加信号発生回路部
の出力を介して最終的に液晶表示素子の画素電極等を帯
電させ見かけ上のしきい値電圧を変化させて、帯電した
画素と帯電していない画素との間での表示むらを発生さ
せてしまうという問題があった。In such a liquid crystal display device, when the liquid crystal display element is switched from the ON state to the OFF state, the electric charge accumulated in each circuit section and wiring section of the above-mentioned liquid crystal drive circuit during the ON state until then. Remains after being turned off. This residual charge finally charges the pixel electrode of the liquid crystal display element via the output of the liquid crystal applied signal generating circuit section, and changes the apparent threshold voltage, so that the charged pixel and the uncharged pixel are separated. There was a problem in that display unevenness occurred between them.
【０００４】また、近年ますます高画素数化、高精細化
が進み、これに対応するために画像信号の処理速度の高
速化や配線の微細化が進んでいる。このため、前述のよ
うな液晶駆動回路の各回路部や配線部に蓄積された残留
電荷が画像信号などへ与えるノイズや波型なまりなどの
悪影響はさらに大きなものとなっている。そしてこれが
原因となって入力された画像信号波形に対する画像の忠
実な再現性が妨げられ、表示画像の画質がさらに低下し
てしまうという問題があった。Further, in recent years, the number of pixels and the definition have become higher and higher, and in order to cope with this, the processing speed of image signals and the fineness of wiring have been advanced. For this reason, the adverse effects such as the noise and the corrugation, which the residual charges accumulated in the respective circuit parts and the wiring parts of the liquid crystal driving circuit described above give to the image signal, become more serious. This causes a problem that the faithful reproducibility of the image with respect to the input image signal waveform is hindered and the image quality of the display image is further deteriorated.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこのような問
題を解消するために為されたもので、その目的は、液晶
駆動回路の各回路部や配線部に蓄積された残留電荷に起
因する液晶表示装置の画像の表示むらや画像の再現性の
低下の問題を解消して、高画質な画像表示を実現する液
晶表示装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and its purpose is due to residual charges accumulated in each circuit section and wiring section of a liquid crystal drive circuit. An object of the present invention is to provide a liquid crystal display device that realizes high-quality image display by solving the problems of image display unevenness and image reproducibility deterioration of the liquid crystal display device.
【０００６】[0006]
【課題を解決するための手段】本発明の液晶表示装置
は、Ｘ電極およびＹ電極の形成された一対の基板間に液
晶を挟持させ前記各電極間に電位差を与えることにより
表示を行なう液晶表示素子と、前記各電極に液晶駆動用
信号を供給する液晶駆動回路部とを有する液晶表示装置
において、前記液晶駆動回路部の電源系間を抵抗を介し
て接続したことを特徴としている。In the liquid crystal display device of the present invention, a liquid crystal display is provided by sandwiching a liquid crystal between a pair of substrates having an X electrode and a Y electrode and applying a potential difference between the electrodes. In a liquid crystal display device having an element and a liquid crystal drive circuit section for supplying a liquid crystal drive signal to each of the electrodes, a power supply system of the liquid crystal drive circuit section is connected via a resistor.
【０００７】なお、上記の液晶駆動回路部の電源系間と
は、具体的には、例えば以下のようなものがある。The above-mentioned power supply systems of the liquid crystal drive circuit section are, for example, as follows.
【０００８】（ａ）電源（ＶDD）とロジック回路部のグ
ランド（ＧＮＤ）との間。(A) Between the power supply (V DD ) and the ground (GND) of the logic circuit section.
【０００９】（ｂ）電源（ＶDD）とバイアス電圧発生回
路部の液晶駆動用電源（ＶEE）との間。(B) Between the power source (V DD ) and the liquid crystal driving power source (V EE ) of the bias voltage generating circuit section.
【００１０】（ｃ）電源（ＶDD）とバイアス電圧発生回
路部のバイアス電圧出力（ＶB ）との間。(C) Between the power supply (V DD ) and the bias voltage output (V B ) of the bias voltage generating circuit section.
【００１１】また、上記の抵抗としては、液晶表示素子
を駆動させる上で実質的に所要の電源電位を維持し、か
つ上記の各回路部の残留電荷を速やかに逃がすような値
に設定されたものを使用する。Further, the resistance is set to a value which maintains a power supply potential substantially required for driving the liquid crystal display element and promptly escapes the residual electric charge of each of the above circuit parts. Use one.
【００１２】[0012]
【作用】液晶駆動回路の電源と液晶駆動回路のロジック
回路部との間や、液晶印加信号発生回路部との間や、バ
イアス電圧発生回路部との間に、抵抗がバイパスとして
接続される。A resistor is connected as a bypass between the power source of the liquid crystal drive circuit and the logic circuit section of the liquid crystal drive circuit, the liquid crystal applied signal generation circuit section, and the bias voltage generation circuit section.
【００１３】この抵抗は、上記のように設定されている
ので、液晶表示素子の駆動には影響を与えることなく残
留電荷の画素電極等への帯電がなくなり液晶表示素子の
見かけ上のしきい値電圧が変化することもなくなり、表
示むらの発生の問題が解消される。Since the resistance is set as described above, the driving of the liquid crystal display element is not affected, and the residual charge is not charged to the pixel electrode or the like, and the apparent threshold value of the liquid crystal display element is eliminated. The voltage does not change, and the problem of display unevenness is solved.
【００１４】また、液晶駆動回路の各回路部や配線部に
蓄積された残留電荷が速やかに電源に帰還されるので、
各回路部や配線部における画像信号のノイズや波型なま
りに起因する画像の再現性の低下の問題も解消される。Further, since the residual charge accumulated in each circuit portion and wiring portion of the liquid crystal drive circuit is promptly returned to the power source,
The problem of deterioration of image reproducibility due to noise and corrugation of the image signal in each circuit section and wiring section is also solved.
【００１５】その結果、高画質な画像表示を実現でき
る。As a result, high quality image display can be realized.
【００１６】[0016]
【実施例】以下、本発明の一実施例を図面に基づいて詳
細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.
【００１７】図１は本発明の液晶表示装置の構成を示す
ブロック図である。FIG. 1 is a block diagram showing the configuration of the liquid crystal display device of the present invention.
【００１８】本発明の液晶表示装置は、液晶表示素子１
と、液晶駆動回路５とを具備している。The liquid crystal display device of the present invention comprises a liquid crystal display element 1.
And a liquid crystal drive circuit 5.
【００１９】この液晶表示素子１は、Ｘ基板に形成され
たＸ電極とＹ基板に形成されたＹ電極とが対面してＸ−
Ｙマトリックスを形成するように組合わされたＸ基板お
よびＹ基板の 2枚の基板と、これら 2枚の基板間に挟持
されるネマティック液晶と、上記各基板のそれぞれに貼
設される偏光板とを有し、液晶駆動回路５によりＸ電極
およびＹ電極に液晶駆動用パルスが印加される一般的な
ネマティック型液晶表示素子である。In this liquid crystal display element 1, the X electrode formed on the X substrate and the Y electrode formed on the Y substrate face each other, and X-
Two substrates, an X substrate and a Y substrate combined so as to form a Y matrix, a nematic liquid crystal sandwiched between these two substrates, and a polarizing plate attached to each of the above substrates. The liquid crystal drive circuit 5 is a general nematic liquid crystal display element in which liquid crystal drive pulses are applied to the X electrodes and the Y electrodes.
【００２０】また、液晶駆動回路５は、ロジック回路部
２とバイアス電圧発生回路部３と液晶駆動信号発生回路
部４と抵抗１１、１２、１３とを有し、液晶表示素子１
に液晶駆動信号（ＶCS）即ち液晶を駆動させる電圧パル
スを印加する。The liquid crystal drive circuit 5 has a logic circuit section 2, a bias voltage generation circuit section 3, a liquid crystal drive signal generation circuit section 4, and resistors 11, 12, and 13, and the liquid crystal display element 1
A liquid crystal drive signal (V CS ), that is, a voltage pulse for driving the liquid crystal is applied to.
【００２１】この液晶駆動回路５の中のロジック回路部
２は、タイミングパルスや画像パルスなど各種のロジッ
ク信号（ＰL ）の入力を受けて液晶駆動信号を制御する
制御信号（ＰC ）を液晶駆動信号発生回路部４に送出す
る。このロジック回路部２は電源電圧（ＶDD）およびグ
ランド（ＧＮＤ）を電源系回路として機能する。The logic circuit section 2 in the liquid crystal drive circuit 5 receives a control signal (P C ) for controlling the liquid crystal drive signal by receiving various logic signals (P L ) such as timing pulses and image pulses. It is sent to the drive signal generating circuit unit 4. The logic circuit section 2 functions with the power supply voltage (V DD ) and the ground (GND) as a power supply system circuit.
【００２２】バイアス電圧発生回路部３は、液晶表示素
子１に印加される液晶駆動信号の基となるバイアス電圧
（ＶB ）を発生してこれを液晶駆動信号発生回路部４に
供給する。このバイアス電圧発生回路部３には電源電圧
（ＶDD）および液晶駆動用電源電圧（ＶEE）が供給され
る。The bias voltage generation circuit section 3 generates a bias voltage (V B ) which is the basis of the liquid crystal drive signal applied to the liquid crystal display element 1 and supplies it to the liquid crystal drive signal generation circuit section 4. A power supply voltage (V DD ) and a liquid crystal driving power supply voltage (V EE ) are supplied to the bias voltage generating circuit section 3.
【００２３】液晶駆動信号発生回路部４は、ロジック回
路部２から入力された制御信号（ＰC ）に制御されて、
バイアス電圧発生回路部３から供給されるバイアス電圧
（ＶB ）を変換し液晶駆動信号（ＶCS）を発生させて、
これを液晶表示素子１に印加する。The liquid crystal drive signal generation circuit section 4 is controlled by the control signal (P C ) input from the logic circuit section 2,
The bias voltage (V B ) supplied from the bias voltage generation circuit unit 3 is converted to generate the liquid crystal drive signal (V CS ),
This is applied to the liquid crystal display element 1.
【００２４】抵抗１１、１２、１３は、それぞれ電源
（ＶDD）とグランド（ＧＮＤ）との間、電源（ＶDD）と
液晶駆動用電源（ＶEE）との間、電源（ＶDD）とバイア
ス電圧出力（ＶB ）との間に接続される。The resistor 11, 12, between each power supply (V DD) and ground (GND), power source and (V DD) between the liquid crystal driving power source (V EE), a power supply (V DD) It is connected to the bias voltage output (V B ).
【００２５】これらの抵抗１１、１２、１３の抵抗値
は、この液晶駆動回路５および液晶表示素子１の駆動に
悪影響を与えない程度の範囲内で、液晶表示素子をオン
状態からオフ状態にスイッチングするときに各回路部や
配線部に蓄積されていた残留電荷が速やかに逃がして電
源（ＶDD）に帰還されるような値、例えば 50kΩから1M
Ω程度の値に設定されている。The resistance values of these resistors 11, 12 and 13 are switched from the ON state to the OFF state within a range that does not adversely affect the driving of the liquid crystal drive circuit 5 and the liquid crystal display element 1. Value that allows residual charge accumulated in each circuit or wiring to be quickly released and returned to the power supply (V DD ), for example, from 50 kΩ to 1 M
It is set to a value around Ω.
【００２６】ここで、本実施例の装置の動作を説明す
る。The operation of the apparatus of this embodiment will be described here.
【００２７】タイミングパルスや画像パルスなど各種の
ロジック信号（ＰL）が入力されると、ロジック回路部
２は、液晶駆動信号を制御する制御信号（ＰC ）を液晶
駆動信号発生回路部４に送出する。When various logic signals (P L ) such as timing pulses and image pulses are input, the logic circuit section 2 sends a control signal (P C ) for controlling the liquid crystal drive signal to the liquid crystal drive signal generation circuit section 4. Send out.
【００２８】一方、バイアス電圧発生回路部３は、電源
電圧（ＶDD）および液晶駆動用電源電圧（ＶEE）の供給
を受けて、液晶表示素子１に印加される液晶駆動信号の
基となるバイアス電圧（ＶB ）を発生し、これを液晶駆
動信号発生回路部４に供給する。On the other hand, the bias voltage generation circuit section 3 receives the supply of the power supply voltage (V DD ) and the liquid crystal drive power supply voltage (V EE ) and serves as the basis of the liquid crystal drive signal applied to the liquid crystal display element 1. A bias voltage (V B ) is generated and supplied to the liquid crystal drive signal generation circuit section 4.
【００２９】液晶駆動信号発生回路部４は、ロジック回
路部２から入力された制御信号（ＰC ）に制御されて、
バイアス電圧発生回路部３から供給されるバイアス電圧
（ＶB ）を変換し液晶駆動信号（ＶCS）を発生させる。
そしてこれを液晶表示素子１に印加する。The liquid crystal drive signal generation circuit section 4 is controlled by the control signal (P C ) input from the logic circuit section 2,
The bias voltage (V B ) supplied from the bias voltage generation circuit unit 3 is converted to generate the liquid crystal drive signal (V CS ).
Then, this is applied to the liquid crystal display element 1.
【００３０】すると液晶表示素子１は、印加されたこの
液晶駆動信号（ＶCS）により駆動されて所定の画像をそ
の画面に再現する。Then, the liquid crystal display element 1 is driven by the applied liquid crystal drive signal (V CS ) to reproduce a predetermined image on the screen.
【００３１】ところで、液晶表示素子をオン状態にして
いる間に、前述の液晶駆動回路の各回路部や配線部には
電荷が蓄積され、それはオフ状態になった後も残留して
しまう。By the way, while the liquid crystal display element is in the ON state, electric charge is accumulated in each circuit section and wiring section of the above-mentioned liquid crystal drive circuit, and remains even after the OFF state.
【００３２】そこで、各回路部やその配線部に蓄積され
た残留電荷を抵抗１１、１２、１３が電源へと逃がして
速やかに帰還させる。Therefore, the residual charges accumulated in each circuit portion and the wiring portion thereof are released to the power source by the resistors 11, 12, and 13 and quickly returned.
【００３３】即ち、抵抗１１はロジック回路部２および
その配線中に蓄積される残留電荷を逃がして電源
（ＶDD）に帰還させ、抵抗１２はバイアス電圧発生回路
部３およびその配線中に蓄積される残留電荷を電源（Ｖ
DD）に帰還させ、抵抗１３は液晶駆動信号発生回路部４
およびその配線中に蓄積された残留電荷を電源（ＶDD）
に速やかに帰還させる。That is, the resistor 11 releases the residual charge accumulated in the logic circuit section 2 and its wiring and feeds it back to the power supply (V DD ), and the resistor 12 is accumulated in the bias voltage generating circuit section 3 and its wiring. The residual charge that
DD ) and the resistor 13 is used for the liquid crystal drive signal generating circuit section 4
And the residual charge accumulated in the wiring is supplied to the power source (V DD ).
Promptly return to.
【００３４】本実施例では、この抵抗１１、１２、１３
の抵抗値が前述のような値に設定されていることで、蓄
積電荷の電源への速やかな帰還が実現される。In this embodiment, the resistors 11, 12, 13 are used.
Since the resistance value of is set to the value as described above, quick return of the accumulated charge to the power supply is realized.
【００３５】このように、これらの抵抗１１、１２、１
３は、液晶駆動回路５の各回路部や配線部に残留する電
荷を速やかに電源（ＶDD）に逃がすことで、この残留電
荷に起因する液晶表示素子の画素電極等への電荷の帯電
を抑制し液晶表示素子の見かけ上のしきい値電圧の変化
を抑制して表示むらの発生を抑制する。また、液晶駆動
回路５の各回路部や配線部に蓄積された残留電荷を速や
かに逃がして電源に帰還させるので、これに起因する各
回路部や配線部における画像信号のノイズや波型なまり
も抑制する。Thus, these resistors 11, 12, 1
Numeral 3 promptly releases the electric charge remaining in each circuit section and the wiring section of the liquid crystal drive circuit 5 to the power source (V DD ), so that the electric charge of the pixel electrode of the liquid crystal display element caused by the residual electric charge is charged. It suppresses the change in the apparent threshold voltage of the liquid crystal display element and suppresses the occurrence of display unevenness. Further, since residual charges accumulated in each circuit section and wiring section of the liquid crystal drive circuit 5 are quickly released and returned to the power source, noise and corrugation of the image signal in each circuit section and wiring section due to this are also eliminated. Suppress.
【００３６】実際にテストパターンを抵抗１１、１２、
１３を用いない液晶表示装置の画面に表示させたとき画
像の表示むらが顕著に見られたものが、本実施例の液晶
表示装置に同様のテストパターンを表示させ目視により
その画質を検証したところ、画像に表示むらや再現性の
低下は見られず、高画質な画像表示が実現されることが
確認された。Actually, the test pattern is set to resistors 11, 12,
When the image was displayed on the screen of the liquid crystal display device not using No. 13, the display unevenness of the image was conspicuous. When the same test pattern was displayed on the liquid crystal display device of the present embodiment, the image quality was visually verified. It was confirmed that high-quality image display was realized without displaying unevenness or deterioration of reproducibility in the image.
【００３７】[0037]
【発明の効果】以上詳細に説明したように、本発明の液
晶表示装置は、液晶駆動回路の各回路部や配線部に蓄積
された残留電荷に起因する画像の表示むらや画像の再現
性の低下の問題を解消して、高画質な画像表示を実現し
ている。As described in detail above, in the liquid crystal display device of the present invention, display unevenness of images and image reproducibility due to residual charges accumulated in each circuit portion and wiring portion of the liquid crystal drive circuit are suppressed. It solves the problem of deterioration and realizes high-quality image display.
【図１】本発明の液晶表示装置の構成を示すブロック
図。FIG. 1 is a block diagram showing a configuration of a liquid crystal display device of the present invention.
１…………………液晶表示素子 ２…………………ロジック回路部 ３…………………バイアス電圧発生回路部 ４…………………液晶駆動信号発生回路部 ５…………………液晶駆動回路 １１、１２、１３…抵抗 1 …………………… Liquid crystal display element 2 …………………… Logic circuit section 3 …………………… Bias voltage generation circuit section 4 ………………… Liquid crystal drive signal generation circuit section 5 ………………… Liquid crystal drive circuit 11, 12, 13… Resistor
Claims (1)
基板間に液晶を挟持させ前記各電極間に電位差を与える
ことにより表示を行なう液晶表示素子と、前記各電極に
液晶駆動用信号を供給する液晶駆動回路部とを有する液
晶表示装置において、 前記液晶駆動回路部の電源系間を抵抗を介して接続した
ことを特徴とする液晶表示装置。1. A liquid crystal display element for performing display by sandwiching a liquid crystal between a pair of substrates on which an X electrode and a Y electrode are formed and applying a potential difference between the electrodes, and a liquid crystal driving signal to each of the electrodes. A liquid crystal display device having a liquid crystal drive circuit unit for supplying the liquid crystal display device, wherein a power supply system of the liquid crystal drive circuit unit is connected via a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25914591A JP3176964B2 (en) | 1991-10-07 | 1991-10-07 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25914591A JP3176964B2 (en) | 1991-10-07 | 1991-10-07 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05100627A true JPH05100627A (en) | 1993-04-23 |
| JP3176964B2 JP3176964B2 (en) | 2001-06-18 |
Family
ID=17329961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25914591A Expired - Fee Related JP3176964B2 (en) | 1991-10-07 | 1991-10-07 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3176964B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011070055A (en) * | 2009-09-28 | 2011-04-07 | Sony Corp | Liquid crystal display device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102496750B1 (en) * | 2019-08-07 | 2023-02-07 | 대한민국 | Double structure house for cultivating ginseng |
-
1991
- 1991-10-07 JP JP25914591A patent/JP3176964B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011070055A (en) * | 2009-09-28 | 2011-04-07 | Sony Corp | Liquid crystal display device |
| US8625039B2 (en) | 2009-09-28 | 2014-01-07 | Japan Display West Inc. | Liquid crystal display device |
| US9159267B2 (en) | 2009-09-28 | 2015-10-13 | Japan Display Inc. | Liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3176964B2 (en) | 2001-06-18 |
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