JP2605799B2 - Liquid crystal device - Google Patents
Liquid crystal deviceInfo
- Publication number
- JP2605799B2 JP2605799B2 JP12416488A JP12416488A JP2605799B2 JP 2605799 B2 JP2605799 B2 JP 2605799B2 JP 12416488 A JP12416488 A JP 12416488A JP 12416488 A JP12416488 A JP 12416488A JP 2605799 B2 JP2605799 B2 JP 2605799B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- image display
- dummy
- voltage
- electrode group
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は画像表示領域の外周部にダミー電極群が設け
られた液晶装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal device having a dummy electrode group provided on an outer peripheral portion of an image display area.
［従来技術］ 従来の液晶装置は、第２図に示すように、画像表示領
域６の外周部に電極がまったく存在しない構造であっ
た。[Prior Art] As shown in FIG. 2, the conventional liquid crystal device has a structure in which no electrode is present on the outer peripheral portion of the image display area 6.
［発明が解決しようとする課題］ しかし、前述の従来技術では、画像表示領域６と、シ
ール材３との間に存在する液晶４は駆動されておらず、
一方、画像表示領域６内に存在する液晶４は駆動されて
いるため、駆動されている液晶と駆動されていない液晶
との境界で、液晶の状態が急激に変化する。このため、
画像表示領域内の液晶の電圧−光透過率特性に部分的な
差異が生じ、コントラストむらが発生してしまう。[Problems to be Solved by the Invention] However, in the above-described conventional technology, the liquid crystal 4 existing between the image display area 6 and the sealing material 3 is not driven,
On the other hand, since the liquid crystal 4 existing in the image display area 6 is driven, the state of the liquid crystal rapidly changes at the boundary between the driven liquid crystal and the non-driven liquid crystal. For this reason,
Partial differences occur in the voltage-light transmittance characteristics of the liquid crystal in the image display area, causing uneven contrast.
この電圧−光透過率特性の差異を示したのが第３図で
ある。画像表示領域中心部の電圧−光透過率特性12に対
して、画像表示領域周辺部の電圧−光透過率特性13は、
より大きい印加電圧を必要とする方向へシフトしている
ことがわかる。第３図では、電圧を印加しないときに光
透過率が低く、電圧を印加するにしたがって徐々に光透
過率が高くなっていく、ノーマリー黒方式での特性を示
している。したがって、ノーマリー黒方式で表示を行っ
た場合は、周辺部が中心部と比較して暗くなることにな
る。また、電圧を印加しないときに光透過率が低く、電
圧を印加するにしたがって徐々に光透過率が高くなって
いくノーマリー白方式では、周辺部が中心部と比較して
明るくなることになる。いずれの場合も、周辺部と中心
部でコントラストむらが発生し、表示品質が著しく低下
してしまうという問題点があった。FIG. 3 shows the difference between the voltage-light transmittance characteristics. In contrast to the voltage-light transmittance characteristic 12 at the center of the image display area, the voltage-light transmittance characteristic 13 at the periphery of the image display area is:
It can be seen that there is a shift to a direction requiring a larger applied voltage. FIG. 3 shows characteristics of a normally black system in which the light transmittance is low when no voltage is applied and gradually increases as the voltage is applied. Therefore, when the display is performed by the normally black method, the peripheral portion becomes darker than the central portion. In the normally white mode, in which the light transmittance is low when no voltage is applied and the light transmittance gradually increases as the voltage is applied, the periphery becomes brighter than the center. In either case, there is a problem that contrast unevenness occurs between the peripheral portion and the central portion, and the display quality is significantly reduced.
［課題を解決するための手段］ 本発明は、一対の基板間に液晶が挟持され、該基板上
に画像表示に用いられる複数の液晶駆動電極が配置され
た液晶駆動電極群を有してなる液晶表示において、該液
晶駆動電極群の外周部には、画像表示に用いられない複
数のダミー電極からなるダミー電極群が形成されてな
り、該ダミー電極群に対応する液晶は、前記液晶駆動電
極群上に存在する液晶の駆動電圧より低電圧で駆動さ
れ、かつ該液晶駆動電極群に近い方から該基板の外周部
に向かうにしたがって、順次低電圧で駆動されることを
特徴とする。[Means for Solving the Problems] The present invention has a liquid crystal driving electrode group in which liquid crystal is sandwiched between a pair of substrates and a plurality of liquid crystal driving electrodes used for image display are arranged on the substrates. In a liquid crystal display, a dummy electrode group including a plurality of dummy electrodes not used for image display is formed on an outer peripheral portion of the liquid crystal drive electrode group, and a liquid crystal corresponding to the dummy electrode group includes the liquid crystal drive electrode. The liquid crystal device is driven at a lower voltage than the driving voltage of the liquid crystal present on the group, and is sequentially driven at a lower voltage from the side closer to the liquid crystal driving electrode group toward the outer peripheral portion of the substrate.
［実施例］ 以下に本発明の実施例を図面に基づいて説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の液晶装置の構造を示す図であり、画
像表示領域６の外周部に縦４列、横３行のダミー電極を
配置して、ダミー電極群７としたものである。FIG. 1 is a view showing the structure of a liquid crystal device according to the present invention, in which dummy electrodes of four columns and three rows are arranged on the outer periphery of an image display area 6 to form a dummy electrode group 7.
第４図（ａ）は液晶駆動電極５に印加される駆動信号
（以下、映像表示信号という）のタイミングチャートで
ある。第４図（ｂ）及び第４図（ｃ）は、ダミー電極に
印加される駆動信号（以下、ダミー信号という）のタイ
ミングチャートであり、第４図（ｃ）の信号が印加され
ているダミー電極は、第４図（ｂ）のものと比べて、基
板のより外周部に位置している。同図によると、ダミー
電極群に対応する液晶は、液晶駆動電極群に対応する液
晶よりも低電圧で駆動されており、かつ基板の該主部に
向かうほどより低電圧で駆動されている。つまり、第４
図（ａ）〜（ｃ）で示される駆動信号の振幅をそれぞれ
A,B,Cとすると、Ａ＞Ｂ＞Ｃの関係が成立する。FIG. 4A is a timing chart of a drive signal (hereinafter, referred to as a video display signal) applied to the liquid crystal drive electrode 5. FIGS. 4 (b) and 4 (c) are timing charts of the drive signal (hereinafter, referred to as a dummy signal) applied to the dummy electrode, and the dummy signal to which the signal of FIG. 4 (c) is applied. The electrodes are located on the outer periphery of the substrate as compared with those of FIG. 4 (b). According to the figure, the liquid crystal corresponding to the dummy electrode group is driven at a lower voltage than the liquid crystal corresponding to the liquid crystal drive electrode group, and is driven at a lower voltage toward the main part of the substrate. That is, the fourth
The amplitudes of the drive signals shown in FIGS.
Assuming that A, B, and C, the relationship of A>B> C is established.
従って、画像表示領域と、ダミー画素群を含む非画像
表示領域との間で液晶状態の変遷が滑らかに行われ、従
来に比べ、コントラストむらの発生を極めて長時間抑え
ることが可能となった。Therefore, the transition of the liquid crystal state between the image display area and the non-image display area including the dummy pixel group is smoothly performed, and it is possible to suppress the occurrence of contrast unevenness for an extremely long time as compared with the related art.
本発明の実施例は縦４列横３列のダミー電極を設けて
いるが、その数には限られない。ただし、ダミー電極数
は多い方がよいが、液晶装置の画面サイズとコストに大
きく影響するため、むやみに多くするわけにはいかな
い。In the embodiment of the present invention, four rows and three columns of dummy electrodes are provided, but the number is not limited. However, it is better to increase the number of dummy electrodes, but since it greatly affects the screen size and cost of the liquid crystal device, it cannot be increased unnecessarily.
［発明の効果］ 以上述べたように、本発明は、表示領域内の周辺部と
中心部におけるコントラストむらの発生を抑えることが
でき、表示品質を著しく向上させることができる。[Effects of the Invention] As described above, according to the present invention, it is possible to suppress the occurrence of uneven contrast at the peripheral portion and the central portion in the display area, and to significantly improve the display quality.
第１図は、本発明の液晶装置の構造を示す部分平面図。 第２図は、従来の液晶装置の構造を示す部分平面図。 第３図は、従来の液晶装置における画像表示領域の中心
部と周辺部の印加電圧−光透過率特性を示した図。 第４図（ａ）は、本発明の液晶装置において、液晶駆動
電極に印加される映像表示信号を示した図。 第４図（ｂ）は、本発明の液晶装置において、ダミー電
極に印加されるダミー信号を示した図。 第４図（ｃ）は、本発明の液晶装置において、第４図
（ｂ）のダミー電極と比較して基板のより外周部に存在
するダミー電極に印加されるダミー信号を示した図。 尚、第４図（ａ），（ｂ），（ｃ）における０とは、グ
ランド電位を表している。 １……基板 ２……対向基板 ３……シール材 ４……液晶 ５……液晶駆動電極 ６……画像表示領域 ７……ダミー電極群 ８……画像表示領域中心部の電圧−光透過率特性 ９……画像表示領域周辺部の電圧−光透過率特性FIG. 1 is a partial plan view showing the structure of the liquid crystal device of the present invention. FIG. 2 is a partial plan view showing the structure of a conventional liquid crystal device. FIG. 3 is a diagram showing applied voltage-light transmittance characteristics of a central portion and a peripheral portion of an image display area in a conventional liquid crystal device. FIG. 4A is a diagram showing a video display signal applied to a liquid crystal drive electrode in the liquid crystal device of the present invention. FIG. 4B is a diagram showing a dummy signal applied to a dummy electrode in the liquid crystal device of the present invention. FIG. 4 (c) is a diagram showing a dummy signal applied to a dummy electrode present on the outer peripheral portion of the substrate as compared with the dummy electrode of FIG. 4 (b) in the liquid crystal device of the present invention. Note that 0 in FIGS. 4A, 4B, and 4C represents the ground potential. DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Counter substrate 3 ... Sealing material 4 ... Liquid crystal 5 ... Liquid crystal drive electrode 6 ... Image display area 7 ... Dummy electrode group 8 ... Voltage-light transmittance at the center of the image display area Characteristic 9: Voltage-light transmittance characteristic around image display area
Claims (1)
に画像表示に用いられる複数の液晶駆動電極が配置され
た液晶駆動電極群を有してなる液晶装置において、該液
晶駆動電極群の外周部には、画像表示に用いられない複
数のダミー電極からなるダミー電極群が形成されてな
り、該ダミー電極に対応する液晶は、前記液晶駆動電極
群に対応する液晶の駆動電圧より低電圧で駆動され、か
つ該液晶駆動電極群に近い方から該基板の外周部に向か
うにしたがって、順次低電圧で駆動されることを特徴と
する液晶装置。1. A liquid crystal device comprising a liquid crystal driving electrode group in which liquid crystal is sandwiched between a pair of substrates and a plurality of liquid crystal driving electrodes used for image display are arranged on the substrates. A dummy electrode group consisting of a plurality of dummy electrodes not used for image display is formed on the outer periphery of the group, and a liquid crystal corresponding to the dummy electrode is driven by a driving voltage of the liquid crystal corresponding to the liquid crystal driving electrode group. A liquid crystal device which is driven at a low voltage and is sequentially driven at a low voltage from the side closer to the liquid crystal drive electrode group toward the outer periphery of the substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12416488A JP2605799B2 (en) | 1988-05-20 | 1988-05-20 | Liquid crystal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12416488A JP2605799B2 (en) | 1988-05-20 | 1988-05-20 | Liquid crystal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01293317A JPH01293317A (en) | 1989-11-27 |
| JP2605799B2 true JP2605799B2 (en) | 1997-04-30 |
Family
ID=14878531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12416488A Expired - Lifetime JP2605799B2 (en) | 1988-05-20 | 1988-05-20 | Liquid crystal device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2605799B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7656372B2 (en) | 2004-02-25 | 2010-02-02 | Nec Corporation | Method for driving liquid crystal display device having a display pixel region and a dummy pixel region |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3027703B2 (en) * | 1995-06-14 | 2000-04-04 | 松下電器産業株式会社 | Active matrix liquid crystal display |
| KR100878266B1 (en) * | 2001-12-17 | 2009-01-13 | 삼성전자주식회사 | Liquid crystal display |
| JP4923866B2 (en) | 2006-08-30 | 2012-04-25 | ソニー株式会社 | Liquid crystal display device and video display device |
| US20080259005A1 (en) * | 2007-04-23 | 2008-10-23 | Tpo Displays Corp. | Display panel and electronic system utilizing the same |
| JP5938850B2 (en) * | 2011-04-22 | 2016-06-22 | セイコーエプソン株式会社 | Reflective liquid crystal display device driving method, reflective liquid crystal display device, and electronic apparatus |
| JP6176348B2 (en) * | 2016-03-14 | 2017-08-09 | セイコーエプソン株式会社 | Liquid crystal display device driving method, liquid crystal display device, and electronic apparatus |
| JP6747068B2 (en) | 2016-06-07 | 2020-08-26 | 三菱電機株式会社 | Liquid crystal display panel and liquid crystal display device including the liquid crystal display panel |
| JP2022166948A (en) | 2021-04-22 | 2022-11-04 | セイコーエプソン株式会社 | Electro-optical device an electronic apparatus |
-
1988
- 1988-05-20 JP JP12416488A patent/JP2605799B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7656372B2 (en) | 2004-02-25 | 2010-02-02 | Nec Corporation | Method for driving liquid crystal display device having a display pixel region and a dummy pixel region |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01293317A (en) | 1989-11-27 |
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