JP3206976B2 - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JP3206976B2 JP3206976B2 JP22190092A JP22190092A JP3206976B2 JP 3206976 B2 JP3206976 B2 JP 3206976B2 JP 22190092 A JP22190092 A JP 22190092A JP 22190092 A JP22190092 A JP 22190092A JP 3206976 B2 JP3206976 B2 JP 3206976B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- electrode
- crystal display
- electrodes
- pixel
- 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 - Fee Related
Links
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
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は液晶表示素子における
コントラスト差の改善に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a contrast difference in a liquid crystal display device.
【０００２】[0002]
【従来の技術】近年、液晶表示素子の用途が拡大してこ
れを用いた表示装置が次第に大型化しており、これに伴
って液晶表示素子自体も大型になりつつある。しかし、
素子が大型になると走査電極あるいは信号電極の抵抗や
画素部のリーク容量等の影響を無視できなくなり、電極
への電圧供給側から終端側にかけて駆動電圧が次第に低
下するようになる。この現象は特に走査電極側が顕著で
ある。このため、液晶層に対する印加電圧が均一でなく
なり、画面の左右間あるいは上下間のコントラストに差
が生じて表示品質が低下するという問題が生じやすくな
る。2. Description of the Related Art In recent years, applications of liquid crystal display elements have been expanded and display devices using the same have been gradually becoming larger, and accordingly, the liquid crystal display elements themselves have also become larger. But,
When the element becomes large, the influence of the resistance of the scanning electrode or the signal electrode, the leakage capacity of the pixel portion, and the like cannot be ignored, and the drive voltage gradually decreases from the voltage supply side to the electrode side to the terminal side. This phenomenon is particularly remarkable on the scanning electrode side. For this reason, the voltage applied to the liquid crystal layer is not uniform, and the contrast between the left and right sides of the screen or the upper and lower sides of the screen is different, so that the problem that the display quality is deteriorated is likely to occur.
【０００３】図５は従来の液晶表示素子の画素の配列状
態を模式的に示したものであり、走査電極と信号電極が
直交する交点部分にそれぞれ画素Ａ，Ａ…がすべて同一
面積で形成されている。そして、例えば図のように水平
方向に走査電極Ｂが形成されていて右端が電圧供給側と
なっている場合、電圧印加時における右端の画素の輝度
Ｒonと左端の画素の輝度Ｌonは Ｒon＞Ｌon となり、
電圧無印加時の各画素の輝度ＲoffとＬoffは変わらない
ために、それぞれのコントラスト比は Ｒon／Ｒoff＞
Ｌon／Ｌoff となって画面の左右間でコントラストに
差が生ずるのである。FIG. 5 schematically shows an arrangement state of pixels of a conventional liquid crystal display element. Pixels A, A... Are all formed in the same area at intersections where scanning electrodes and signal electrodes are orthogonal to each other. ing. For example, when the scanning electrode B is formed in the horizontal direction as shown in the figure and the right end is the voltage supply side, the luminance Ron of the right end pixel and the luminance Lon of the left end pixel when a voltage is applied are Ron> Lon Becomes
Since the luminance Roff and Loff of each pixel when no voltage is applied do not change, the respective contrast ratios are Ron / Roff>
Lon / Loff results in a difference in contrast between the left and right sides of the screen.
【０００４】[0004]
【発明が解決しようとする課題】このようなコントラス
ト差は、例えば電極の膜厚を厚くすることによってある
程度解消することができるが、これでは電極の透過率が
低下するので輝度が低下し、また成膜時のコストが上昇
する等のデメリットがあるので限界があり、改善対策と
しては不十分なものであった。この発明はこのような問
題点に着目し、同一画面内で生ずるコントラスト差を解
決することを課題としてなされたものである。Such a contrast difference can be eliminated to some extent by, for example, increasing the thickness of the electrode. However, in this case, the transmittance of the electrode is reduced, so that the luminance is reduced. There are disadvantages, such as an increase in the cost of film formation, and there is a limit, which is insufficient as an improvement measure. The present invention has been made in view of such a problem, and has an object to solve a contrast difference generated in the same screen.
【０００５】[0005]
【課題を解決するための手段】上述の課題を解決するた
めに、この発明では、帯状の走査電極と信号電極を互い
に直交するように対向配置してその間に液晶層を介在さ
せた構造の液晶表示素子において、信号電極をその中心
間の間隔を一定にするとともに、その幅を走査電極の電
圧供給側から終端側になるに伴って大きくして、両電極
が互いに交差して形成される画素の面積を走査電極の電
圧供給側から終端側になるに伴って大きくしている。図
１はこの発明における液晶表示素子の画素の配列状態を
模式的に示したものであり、走査電極と信号電極が直交
する交点部分にそれぞれ画素１, １…が形成され、その
面積が電圧供給側から終端側にかけて順次大きくなって
いる。例えば走査電極が水平に配置されている場合、図
のように右端が電圧供給側であれば最右端の画素１の面
積が最も小さくなり、最左端の画素１の面積が最も大き
くなるのである。According to the present invention, there is provided a liquid crystal having a structure in which a band-like scanning electrode and a signal electrode are opposed to each other so as to be orthogonal to each other and a liquid crystal layer is interposed therebetween. In the display element, a pixel in which both electrodes are formed to intersect with each other by making the distance between the centers of the signal electrodes constant and increasing the width thereof from the voltage supply side to the terminal side of the scanning electrodes. Is increased from the voltage supply side of the scanning electrode to the terminal side. FIG. 1 schematically shows an arrangement state of pixels of a liquid crystal display element according to the present invention. Pixels 1, 1... Are formed at intersections where scanning electrodes and signal electrodes intersect at right angles. From the side to the terminal side. For example, when the scanning electrodes are arranged horizontally, if the right end is the voltage supply side as shown in the figure, the area of the rightmost pixel 1 is the smallest, and the area of the leftmost pixel 1 is the largest.
【０００６】[0006]
【作用】電圧供給側から終端側にかけて駆動電圧が次第
に低下することによって画素１の単位面積当たりの輝度
が低下しても、画素面積を大きくすることによってこれ
が補償される。このため、肉眼で見た場合の右端の画素
１の輝度Ｒonと左端の画素１の輝度Ｌonを実質的に一定
に保ち、均一なコントラストを得ることが可能となる。When the driving voltage gradually decreases from the voltage supply side to the terminal side, the luminance per unit area of the pixel 1 decreases, but this is compensated by increasing the pixel area. Therefore, the brightness Ron of the rightmost pixel 1 and the brightness Lon of the leftmost pixel 1 when viewed with the naked eye can be kept substantially constant, and a uniform contrast can be obtained.
【０００７】[0007]
【実施例】次に、この発明の実施例について説明する。
図２及び図３において、２は一方の面に複数の帯状の走
査電極３を一定の間隔で平行に形成した走査電極基板で
あり、走査電極３の右端３ａは図外の駆動回路に接続さ
れる電圧供給側となる。また、４は基板２に対向する側
の面に複数の帯状の信号電極５を平行に且つ走査電極３
と直交する方向に形成した信号電極基板であるが、各信
号電極５は図のようにその中心間の間隔を変えないでそ
の幅を右端から左端にかけて順次大きくしてある。信号
電極５の上端５ａは図外の駆動回路に接続される電圧供
給側となる。なお、各基板２，４には液晶配向膜等も形
成されるが、これらはこの発明に直接の関係がないので
図示は省略してある。Next, an embodiment of the present invention will be described.
2 and 3, reference numeral 2 denotes a scanning electrode substrate in which a plurality of strip-shaped scanning electrodes 3 are formed on one surface in parallel at regular intervals, and the right end 3a of the scanning electrode 3 is connected to a driving circuit (not shown). Voltage supply side. Reference numeral 4 denotes a plurality of strip-shaped signal electrodes 5 on a surface facing the substrate 2 in parallel with the scanning electrodes 3.
Although the signal electrode substrate is formed in a direction perpendicular to the above, the width of each signal electrode 5 is gradually increased from the right end to the left end without changing the center-to-center spacing as shown in the figure. The upper end 5a of the signal electrode 5 is on the voltage supply side connected to a drive circuit (not shown). Although a liquid crystal alignment film and the like are also formed on each of the substrates 2 and 4, they are not shown because they are not directly related to the present invention.
【０００８】以上のような構成の基板２，４を図３に示
すように所定の間隔を保って対向配置し、その間に液晶
層６を設け、シール材７で封止して液晶表示素子８が構
成される。従って、走査電極３と信号電極５が直交する
交点部分にそれぞれ画素が形成されるのであるが、その
面積は走査電極３の電圧供給側となる右端３ａ側から終
端の左端３ｂ側にかけて順次大きくなり、図１に示すよ
うな画素１，１…が形成されることになる。As shown in FIG. 3, the substrates 2 and 4 having the above-mentioned construction are arranged facing each other at a predetermined interval, a liquid crystal layer 6 is provided between them, and a liquid crystal display element 8 is formed. Is configured. Accordingly, pixels are formed at intersections where the scanning electrode 3 and the signal electrode 5 are orthogonal to each other. The area of the pixel sequentially increases from the right end 3a, which is the voltage supply side of the scanning electrode 3, to the left end 3b at the end. Are formed as shown in FIG.
【０００９】この実施例は上述のような構成であり、走
査電極３の右端３ａと信号電極５の上端５ａを図外の駆
動回路にそれぞれ接続して作動させた場合には、走査電
極３の右端３ａから終端の左端３ｂ側にかけて駆動電圧
が次第に低下しても、それぞれの画素１の面積が次第に
大きくなるので単位面積当たりの輝度の低下が補償され
る。従って、右端から左端までの各画素１，１…の面積
の変化率を液晶表示素子８のパネルの大きさ等を考慮し
て適正に選定しておくことにより、右端から左端までの
輝度を実質的に一定に保ち、コントラスト差のない表示
結果を得ることが可能となるのである。This embodiment is configured as described above. When the right end 3a of the scanning electrode 3 and the upper end 5a of the signal electrode 5 are connected to a driving circuit (not shown) and operated, the scanning electrode 3 Even if the drive voltage gradually decreases from the right end 3a to the left end 3b side, the area of each pixel 1 gradually increases, so that a decrease in luminance per unit area is compensated. Therefore, by appropriately selecting the rate of change of the area of each pixel 1, 1,... From the right end to the left end in consideration of the size of the panel of the liquid crystal display element 8, the luminance from the right end to the left end is substantially reduced. Thus, it is possible to obtain a display result without any contrast difference.
【００１０】このように画素１, １…の面積を変化させ
ること自体は、例えば信号電極５の幅は同一としてお
き、図４に示すように各走査電極３の幅を右端３ａから
左端３ｂにかけて次第に太くすることによっても可能で
ある。しかしその場合には、走査電極３と一致する方向
の直線を表示した時に左側が太く、右側が細い表示にな
り、更に見る角度によっては傾いて見えることもあるの
で好ましくない。また、走査電極３の方が信号電極４よ
りも電圧低下が大きくコントラスト差が顕著に出やすい
ので、信号電極４の幅を変える方が十分な補償効果が得
られる。なお、信号電極４の駆動電圧の低下は比較的小
さいので、各走査電極３の幅がすべて同一であっても実
用上の問題は生じない。In order to change the area of the pixels 1, 1..., For example, the width of the signal electrode 5 is set to be the same, and the width of each scanning electrode 3 is changed from the right end 3a to the left end 3b as shown in FIG. It is also possible by gradually increasing the thickness. However, in this case, when a straight line in the direction coinciding with the scanning electrode 3 is displayed, the left side becomes thicker and the right side becomes thinner. Further, since the scanning electrode 3 has a larger voltage drop than the signal electrode 4 and a contrast difference is more likely to occur, a sufficient compensation effect can be obtained by changing the width of the signal electrode 4. Since the reduction in the driving voltage of the signal electrode 4 is relatively small, no practical problem occurs even if the width of each scanning electrode 3 is all the same.
【００１１】[0011]
【発明の効果】上述の実施例から明らかなように、この
発明は、信号電極をその中心間の間隔を一定にするとと
もに、その幅を走査電極の電圧供給側から終端側になる
に伴って大きくして、帯状の両電極が交差して形成され
る画素の面積を走査電極の電圧供給側から終端側になる
に伴って大きくしたものである。従って、電極抵抗やリ
ーク容量のために電圧供給側から終端側にかけて走査電
極の駆動電圧が次第に低下することによって生じやすい
輝度の低下が、信号電極の幅を大きくして画素面積を大
きくすることによって補償されるのであり、同一画面内
でのコントラスト差の発生を防止し、大型の液晶表示素
子における表示品質を向上することが可能となるのであ
る。As is apparent from the above-described embodiment, the present invention makes the distance between the center of the signal electrode constant and the width of the signal electrode from the voltage supply side to the end side of the scan electrode. In this case, the area of a pixel formed by intersecting both band-shaped electrodes is increased from the voltage supply side of the scanning electrode to the terminal side. Therefore, a decrease in luminance, which is likely to occur due to a gradual decrease in the drive voltage of the scan electrode from the voltage supply side to the terminal side due to electrode resistance and leak capacitance, is caused by increasing the width of the signal electrode and increasing the pixel area. This is compensated, and it is possible to prevent the occurrence of a contrast difference in the same screen, and to improve the display quality of a large-sized liquid crystal display device.
【図１】この発明における画素の配列状態を示す模式図
である。FIG. 1 is a schematic diagram showing an arrangement state of pixels according to the present invention.
【図２】この発明の一実施例の各基板の概略平面図であ
る。FIG. 2 is a schematic plan view of each substrate according to one embodiment of the present invention.
【図３】同実施例の概略断面図である。FIG. 3 is a schematic sectional view of the embodiment.
【図４】比較例の基板の概略平面図である。FIG. 4 is a schematic plan view of a substrate of a comparative example.
【図５】従来例における画素の配列状態を示す模式図で
ある。FIG. 5 is a schematic diagram showing an arrangement state of pixels in a conventional example.
１ 画素 ２ 走査電極基板 ３ 走査電極 ４ 信号電極基板 ５ 信号電極 ６ 液晶層 ８ 液晶表示素子 1 pixel 2 scanning electrode substrate 3 scanning electrode 4 signal electrode substrate 5 signal electrode 6 liquid crystal layer 8 liquid crystal display element
Claims (1)
極を、他方の内面に帯状の信号電極をそれぞれ形成し、
両電極が直交するように所定の間隔を保って対向配置し
て両電極間に液晶層を介在させた液晶表示素子におい
て、前記信号電極をその中心間の間隔を一定にするとと
もに、その幅を走査電極の電圧供給側から終端側になる
に伴って大きくして、上記両電極が互いに交差して形成
される画素の面積を走査電極の電圧供給側から終端側に
なるに伴って大きくしたことを特徴とする液晶表示素
子。1. A band-shaped scanning electrode is formed on one inner surface of two substrates, and a band-shaped signal electrode is formed on the other inner surface, respectively.
In a liquid crystal display element in which a liquid crystal layer is interposed between two electrodes while maintaining a predetermined interval so that both electrodes are orthogonal to each other, the distance between the center of the signal electrode is made constant and the width thereof is reduced. The area of a pixel formed by the two electrodes intersecting each other is increased from the voltage supply side of the scanning electrode to the terminal side, and is increased from the voltage supply side of the scanning electrode to the terminal side. A liquid crystal display device characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22190092A JP3206976B2 (en) | 1992-07-28 | 1992-07-28 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22190092A JP3206976B2 (en) | 1992-07-28 | 1992-07-28 | Liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0651326A JPH0651326A (en) | 1994-02-25 |
| JP3206976B2 true JP3206976B2 (en) | 2001-09-10 |
Family
ID=16773921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22190092A Expired - Fee Related JP3206976B2 (en) | 1992-07-28 | 1992-07-28 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3206976B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5731803A (en) * | 1995-12-21 | 1998-03-24 | Xerox Corporation | Array with light active units sized to eliminate artifact from size difference |
| GB0102756D0 (en) * | 2001-02-03 | 2001-03-21 | Koninkl Philips Electronics Nv | Method of improving the conductivity of transparent conductor lines |
-
1992
- 1992-07-28 JP JP22190092A patent/JP3206976B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0651326A (en) | 1994-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |