JPH0497226A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH0497226A JPH0497226A JP2212701A JP21270190A JPH0497226A JP H0497226 A JPH0497226 A JP H0497226A JP 2212701 A JP2212701 A JP 2212701A JP 21270190 A JP21270190 A JP 21270190A JP H0497226 A JPH0497226 A JP H0497226A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- electrode
- made different
- thickness
- 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 30
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 238000001228 spectrum Methods 0.000 abstract description 11
- 229910004205 SiNX Inorganic materials 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 23
- 239000011521 glass Substances 0.000 description 7
- 239000004642 Polyimide Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、２枚の基板間に液晶を封入してなる液晶表示
装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a liquid crystal display device comprising a liquid crystal sealed between two substrates.
（ロ）従来技術
２枚の基板間に挟まれた微小な空間に液晶を封入してな
る従来の液晶表示装置を第２図に示す。(B) Prior Art FIG. 2 shows a conventional liquid crystal display device in which liquid crystal is sealed in a small space sandwiched between two substrates.
同図は、薄膜トランジスタ（ＴＰＴ）を備えた一般的な
アクティブマトリクス型の液晶表示装置の一画素単位の
断面図であり、以下にその構造を概説する。This figure is a cross-sectional view of one pixel of a general active matrix liquid crystal display device equipped with a thin film transistor (TPT), and the structure thereof will be outlined below.
１はガラス基板（厚み＋ １ｍｍ） 、２はＩＴＯ表示
電極（厚み： １０００人）、３はポリイミド配向膜（
厚み： １０００人）であり、これらは２枚の電極基板
に共通である。更に、４はこれら２枚の電極基板間に封
入された液晶層（厚み：５μｍ）である。また、５は一
方の基板（ＴＰＴアレーをなす画素電極基板）にゲート
絶縁膜として設けられたＳｉＮｘ絶縁膜である。1 is a glass substrate (thickness + 1 mm), 2 is an ITO display electrode (thickness: 1000), and 3 is a polyimide alignment film (
Thickness: 1000 mm), which is common to the two electrode substrates. Furthermore, 4 is a liquid crystal layer (thickness: 5 μm) sealed between these two electrode substrates. Further, 5 is a SiNx insulating film provided as a gate insulating film on one substrate (pixel electrode substrate forming a TPT array).
従って、同図の右側の表示領域りでは、全体として、ガ
ラス／ＩＴＯ／ポリイミド／液晶／配向膜／ Ｉ Ｔ
Ｏ／ Ｓ ｉ Ｎ ｘ ／ガラスという層構成を成す。Therefore, in the display area on the right side of the figure, as a whole, glass/ITO/polyimide/liquid crystal/alignment film/IT
It has a layer structure of O/SiNx/glass.
尚、画素電極基板にＴＰＴが備えられた同図の左側の領
域は、非表示領域Ｔをなす。ここに図示されたＴＰＴは
、一般的なアモルファスシリコン（ａ−８ｉ）を用いた
ものであり、ＳｉＮｘゲート絶縁膜５、ドレイン電極１
１、ｎ＋型ａ−５ｉコンタクト領域１２、ａ−５ｉ半導
体動作領域１３、ＳｉＮｘｇｌ、Ｗ膜１４、ゲート電極
１５、ソース電極１６からなる逆スタガータイプＴＰＴ
である。Note that the area on the left side of the figure in which the pixel electrode substrate is provided with the TPT forms the non-display area T. The TPT shown here uses general amorphous silicon (a-8i), and has a SiNx gate insulating film 5, a drain electrode 1
1. Inverted stagger type TPT consisting of n+ type a-5i contact region 12, a-5i semiconductor operating region 13, SiNxGL, W film 14, gate electrode 15, and source electrode 16
It is.
上述の構成の従来の液晶表示装置の表示領域りに於ては
、一般に各膜の屈折率は異なり、これらの膜を光が通過
する場合、各膜の界面で反射を生じ、これらの反射光と
透過光の干渉により出射光は強い波長依存性を示す。In the display area of a conventional liquid crystal display device with the above configuration, each film generally has a different refractive index, and when light passes through these films, reflection occurs at the interface of each film, and these reflected lights The emitted light exhibits strong wavelength dependence due to interference between the transmitted light and the transmitted light.
この干渉スペクトルは各膜の屈折率、膜厚によって決ま
るので、第２図の場合の屈折率は以下の通りである。Since this interference spectrum is determined by the refractive index and film thickness of each film, the refractive index in the case of FIG. 2 is as follows.
ガラス基板＝１．５
表示電極（ＩＴＯ）：２，０
配向膜（ポリイミド）：１，６
液晶−１，５
絶縁膜（ＳｉＮｘ）：１，８
従って、基板ガラス／表示電極、表示電極／配向膜間の
反射が比較的強く、また、液晶層の厚みが約５μｍと大
きいため、この反射による干渉スペクトルは可視光の範
囲において１５〜２０ｎｍ程度の細かいピッチで山谷が
現れる形状となる。Glass substrate = 1.5 Display electrode (ITO): 2,0 Alignment film (polyimide): 1,6 Liquid crystal - 1,5 Insulating film (SiNx): 1,8 Therefore, substrate glass/display electrode, display electrode/alignment Since the reflection between the films is relatively strong and the thickness of the liquid crystal layer is as large as about 5 μm, the interference spectrum due to this reflection has a shape in which peaks and valleys appear at a fine pitch of about 15 to 20 nm in the visible light range.
一方、液晶層の厚みは通常スペーサ（図示せず）により
保持されるが、この厚みの面内のばらつきは±０．１μ
ｍ程度の精度でしか制御できない。On the other hand, the thickness of the liquid crystal layer is usually maintained by spacers (not shown), but the in-plane variation in this thickness is ±0.1 μm.
It can only be controlled with an accuracy of about m.
この０．１μｍの液晶層の厚みの変化は、上記干渉スペ
クトルの山谷が反転するのに十分な変化である。そして
この山谷の反転により生ずる出射光量の差が表示素子の
表示状態でのムラとなる。特に、光源として例えば螢光
灯のようなものを用いた場合、そのピーク波長における
山谷の反転が出射光量の大きな変化を与えることになる
。その結果、液晶層の厚みの微小な変化に対応した輝度
ムラが生じ、液晶表示素子の表示品位に対し著しく悪影
響を及ぼす。This change in the thickness of the liquid crystal layer of 0.1 μm is sufficient to invert the peaks and valleys of the interference spectrum. The difference in the amount of emitted light caused by the reversal of the peaks and troughs causes unevenness in the display state of the display element. In particular, when a fluorescent lamp or the like is used as a light source, the reversal of peaks and troughs at its peak wavelength causes a large change in the amount of emitted light. As a result, brightness unevenness occurs corresponding to minute changes in the thickness of the liquid crystal layer, which has a significant negative impact on the display quality of the liquid crystal display element.
（ハ）発明が解決しようとする課題
本発明は、上述のような輝度ムラを無くするための液晶
表示装置の構成を提供するものである。(c) Problems to be Solved by the Invention The present invention provides a structure of a liquid crystal display device for eliminating the above-mentioned brightness unevenness.
（ニ）課題を解決するための手段
本発明の液晶表示装置は、電極構造で区画される各画素
内に、電極基板間隔を異ならせて液晶層厚を変化させた
領域を備えたものである。具体的には、各画素それぞれ
に於て、電極に段差を設けて、各画素内でセルギャップ
を変化させることで表示輝度ムラが解消される。(d) Means for Solving the Problems The liquid crystal display device of the present invention is provided with regions in which the thickness of the liquid crystal layer is varied by varying the electrode substrate spacing within each pixel divided by the electrode structure. . Specifically, display brightness unevenness is eliminated by providing a step in the electrode in each pixel and changing the cell gap within each pixel.
（ホ）作用
本発明の液晶表示装置によれば、各画素内で少なくとも
セルギャップの異なる２つの部分が存在するので、その
２つの部分で透過光の干渉スペクトルの形状が異なり、
実際の透過光はこれらの干渉スペクトルの和となるため
、スペクトルの山谷の差が緩和され、干渉現象の低減が
図れる。(E) Effect According to the liquid crystal display device of the present invention, since there are at least two portions with different cell gaps in each pixel, the shape of the interference spectrum of transmitted light is different in the two portions.
Since the actual transmitted light is the sum of these interference spectra, the difference between the peaks and troughs of the spectrum is alleviated, and the interference phenomenon can be reduced.
（へ）実施例
第１図は、本発明をアクティブマトリクス型の液晶表示
装置に採用した場合の一実施例の装置断面図である。(F) Embodiment FIG. 1 is a sectional view of an embodiment of an active matrix type liquid crystal display device in which the present invention is applied.
同図の本発明装置が第２図の従来装置と異なるところは
、１画素の表示領域り内にＳｉＮｘ膜からなる透明膜６
を設けて、セルギャップの異なる領域を備えた点にある
。The difference between the device of the present invention shown in the same figure and the conventional device shown in FIG.
The point is that it has regions with different cell gaps.
このような透明膜６の膜厚の選択については、膜構造に
対し、透過率の波長依存性を計算し、干渉スペクトルの
山谷の差が最小となる膜厚を選べばよい。この最適膜厚
は周期的に各種水められるが、透明膜の段差部分でのＩ
ＴＯ電極２の段切れ等を考慮すると、最小のものを選択
するのが望ましい。例えば、屈折率２．ＯのＩＴＯの場
合、その電極２の膜厚は２０００人程度８なり、Ｓ１０
．の場合には８００人となる。The thickness of the transparent film 6 can be selected by calculating the wavelength dependence of transmittance for the film structure and selecting the film thickness that minimizes the difference between peaks and troughs in the interference spectrum. This optimal film thickness is determined by periodically applying various types of water, but the I
Considering the possibility of disconnection of the TO electrode 2, it is desirable to select the smallest one. For example, the refractive index is 2. In the case of ITO of O, the film thickness of the electrode 2 is about 2000 8,
．． In this case, there will be 800 people.
又、透明膜６の有無の部分の面積比は表示領域に対し、
１：１程度が最も効果的である。本実施例では透明膜を
用いたが、この材質としてはＳｉＯ，、ＩＴＯ等光常光
学的明なものであれば制限はない。又、対向電極基板側
に段差を設けたが、これを画素電極基板側に設けてもよ
い。更に、本実施例では透明膜を用いたが、ガラス基板
に直接段差を設けてもよい。また、形状も制限はなく、
細かい凹凸形状であってもよい。In addition, the area ratio of the portion with and without the transparent film 6 to the display area is as follows:
A ratio of about 1:1 is most effective. Although a transparent film is used in this embodiment, the material is not limited as long as it is optically bright, such as SiO, ITO, etc. Further, although the step is provided on the counter electrode substrate side, it may be provided on the pixel electrode substrate side. Furthermore, although a transparent film was used in this embodiment, a step may be provided directly on the glass substrate. Also, there are no restrictions on the shape,
It may have a fine uneven shape.
（ト）発明の効果
本発明の液晶表示装置によれば、各画素内で少なくとも
セルギャップの異なる２つの領域が存在するので、これ
らの領域での透過光の干渉スペクトルが緩和され、干渉
現象の低減が図れるため、表示上の輝度ムラを解消する
ことができる。(g) Effects of the Invention According to the liquid crystal display device of the present invention, since there are at least two regions with different cell gaps in each pixel, the interference spectrum of transmitted light in these regions is relaxed, and the interference phenomenon is reduced. Since the reduction can be achieved, it is possible to eliminate uneven brightness on the display.
第１図は本発明をアクティブマトリクス型の液晶表示装
置に採用した場合の一実施例の装置断面図、第２図は従
来装置の断面図である。
１・・・ガラス基板、２・・・ＩＴＯ表示電極、３・・
・ボッイミド配向膜、４・・・液晶、５・・・５ｉＮｘ
、６・・・ＩＴＯ透明電極。FIG. 1 is a sectional view of an embodiment of an active matrix liquid crystal display device in which the present invention is applied, and FIG. 2 is a sectional view of a conventional device. 1...Glass substrate, 2...ITO display electrode, 3...
・Boimide alignment film, 4...Liquid crystal, 5...5iNx
, 6... ITO transparent electrode.
Claims (1)
板のそれぞれの電極構造によって画素単位を区画し、該
画素毎に液晶を駆動する液晶表示装置に於て、 上記電極構造で区画される各画素内に、電極基板間隔を
異ならせて液晶層厚を変化させた領域を備えてなる事を
特徴とした液晶表示装置。(1) In a liquid crystal display device in which liquid crystal is sealed between two electrode substrates, pixel units are divided by the respective electrode structures of both substrates, and the liquid crystal is driven for each pixel, the above electrode structure A liquid crystal display device comprising, within each pixel divided by , regions in which the thickness of the liquid crystal layer is varied by varying the spacing between electrode substrates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21270190A JP2567724B2 (en) | 1990-08-10 | 1990-08-10 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21270190A JP2567724B2 (en) | 1990-08-10 | 1990-08-10 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0497226A true JPH0497226A (en) | 1992-03-30 |
| JP2567724B2 JP2567724B2 (en) | 1996-12-25 |
Family
ID=16627000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21270190A Expired - Fee Related JP2567724B2 (en) | 1990-08-10 | 1990-08-10 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2567724B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001311936A (en) * | 2000-04-27 | 2001-11-09 | Victor Co Of Japan Ltd | Liquid crystal display element |
| US11573460B2 (en) | 2018-04-16 | 2023-02-07 | Sony Corporation | Liquid crystal display device and electronic apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115522A (en) * | 1981-01-09 | 1982-07-19 | Alps Electric Co Ltd | Liquid crystal display |
| JPS60217340A (en) * | 1984-04-13 | 1985-10-30 | Matsushita Electric Ind Co Ltd | Liquid crystal display device and its manufacture |
-
1990
- 1990-08-10 JP JP21270190A patent/JP2567724B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115522A (en) * | 1981-01-09 | 1982-07-19 | Alps Electric Co Ltd | Liquid crystal display |
| JPS60217340A (en) * | 1984-04-13 | 1985-10-30 | Matsushita Electric Ind Co Ltd | Liquid crystal display device and its manufacture |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001311936A (en) * | 2000-04-27 | 2001-11-09 | Victor Co Of Japan Ltd | Liquid crystal display element |
| US11573460B2 (en) | 2018-04-16 | 2023-02-07 | Sony Corporation | Liquid crystal display device and electronic apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2567724B2 (en) | 1996-12-25 |
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