JPH02165123A - Reflection type liquid crystal display device - Google Patents
Reflection type liquid crystal display deviceInfo
- Publication number
- JPH02165123A JPH02165123A JP63321176A JP32117688A JPH02165123A JP H02165123 A JPH02165123 A JP H02165123A JP 63321176 A JP63321176 A JP 63321176A JP 32117688 A JP32117688 A JP 32117688A JP H02165123 A JPH02165123 A JP H02165123A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- display device
- crystal display
- substrate
- reflective
- 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 description 31
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 claims 1
- 239000011159 matrix material Substances 0.000 claims 1
- 239000010409 thin film Substances 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052814 silicon oxide Inorganic materials 0.000 abstract description 5
- 229910021417 amorphous silicon Inorganic materials 0.000 abstract description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000012212 insulator Substances 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、プロジェクション表示デバイスに利用するア
クティブ素子を有した反射型液晶表示デバイスに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reflective liquid crystal display device having an active element used in a projection display device.
従来の技術
近年、アクティブ素子を利用した液晶表示デバイスはポ
ケットテレビまたは情報端末として利用されるようにな
ってきた。2. Description of the Related Art In recent years, liquid crystal display devices using active elements have come to be used as pocket televisions or information terminals.
以下に従来の反射型液晶表示デバイスについて説明する
。A conventional reflective liquid crystal display device will be explained below.
第２図は従来の反射型液晶表示デバイスの断面図であり
、ｌは絶縁基板、２は配線電極、３はスイッチング素子
、４は絶縁体層、５は反射画素１ま橿、６は液晶層、７
は対向共通電極、８は対向透明基板である。FIG. 2 is a cross-sectional view of a conventional reflective liquid crystal display device, where l is an insulating substrate, 2 is a wiring electrode, 3 is a switching element, 4 is an insulator layer, 5 is a reflective pixel 1 or a frame, and 6 is a liquid crystal layer. ,7
8 is a counter common electrode, and 8 is a counter transparent substrate.
以上のように構成された反射型液晶表示デバイスについ
て、以下その動作について説明する。The operation of the reflective liquid crystal display device configured as described above will be described below.
まず、スイッチング素子３がオン状態になると反射画素
電極５に電流が流れる。これにより、反射画素電極５と
対向共通電極７に挟まれた液晶層６に電圧が印加され、
液晶が動作する。このとき、表示を見やすくするための
光は対向透明電極側から照射され、反射画素電極５で入
射光は反射される。ここで、光は液晶層６を通る際に偏
光され、偏光されなかった画素との間にコントラストの
差が生じ、画素が得られる。First, when the switching element 3 is turned on, a current flows through the reflective pixel electrode 5. As a result, a voltage is applied to the liquid crystal layer 6 sandwiched between the reflective pixel electrode 5 and the opposing common electrode 7.
LCD works. At this time, light for making the display easier to see is irradiated from the opposite transparent electrode side, and the incident light is reflected by the reflective pixel electrode 5. Here, the light is polarized when passing through the liquid crystal layer 6, and a contrast difference occurs between the light and the non-polarized pixels, and pixels are obtained.
発明が解決しようとするｔＪ、Ｂ
しかしながら上記の従来の構成では、光が液晶層側から
反射電極間の絶縁層を通って絶縁基板との界面ａで反射
が起こり、ＴＰＴ内部に進入する。tJ, B to be Solved by the Invention However, in the above conventional configuration, light passes from the liquid crystal layer side through the insulating layer between the reflective electrodes, is reflected at the interface a with the insulating substrate, and enters the inside of the TPT.
第３図は光の進入経路についての説明図である。FIG. 3 is an explanatory diagram of the entrance path of light.
このためスイッチング素子に光が作用して、スイッチン
グ素子を構成する半導体層の電気抵抗を減少させる（光
伝導）、これにより画素電極と対向共通電極とに蓄えら
れた電荷がスイッチング素子を通して漏れ、結果的に液
晶の配向が変化してコントラストの低下をもたらすとい
う欠点を有していた。For this reason, light acts on the switching element and reduces the electrical resistance of the semiconductor layer that makes up the switching element (photoconduction).As a result, the charges stored in the pixel electrode and the opposing common electrode leak through the switching element, resulting in However, this method has the drawback that the orientation of the liquid crystal changes, resulting in a decrease in contrast.
本発明は上記従来の問題点を解決するものでデイスプレ
ィ画面のコントラスト低下を解消することができる反射
型液晶表示デバイスを提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a reflective liquid crystal display device that solves the above-mentioned conventional problems and can eliminate the decrease in contrast of a display screen.
課題を解決するための手段
この目的を達成するために本発明の反射型液晶表示デバ
イスは、スイッチング素子を具備した基板側の絶縁基板
と絶縁体層またはスイッチング素子の界面に設けられた
光透過係数の高い物質からなる反射防止膜から構成され
ている。Means for Solving the Problems To achieve this object, the reflective liquid crystal display device of the present invention has a light transmission coefficient provided at the interface between the insulating substrate and the insulating layer or the switching element on the side of the substrate provided with the switching element. It consists of an anti-reflection coating made of a substance with high
作用
この構成によって、反射電極間の絶縁層からアレイ内部
に進入した光が絶縁基板と絶縁体層との界面で反射せず
、絶縁基板へと透過していく、このためスイッチング素
子の光伝導が原因となる漏れ電流を防ぐことができる。Effect: With this configuration, light that enters the array from the insulating layer between the reflective electrodes is not reflected at the interface between the insulating substrate and the insulating layer, but is transmitted to the insulating substrate, which reduces the light conduction of the switching element. This can prevent the leakage current that causes this.
実施例
以下本発明の一実施例の反射型液晶表示デバイスについ
て、図面を参照しながら説明する。EXAMPLE Hereinafter, a reflective liquid crystal display device according to an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例における反射型液晶表示デバ
イスの断面構造を示すものである。第１図において、１
１は絶縁基板としてガラス基板、１２は配線電極、１３
はスイッチング素子としてＴＰＴおよび補助容量、１４
は絶縁体層として非晶質窒化ケイ素膜、１５は反射画素
電極、１６は液晶層、１７は対向共通電極として、スパ
ッタにより成膜されたＩＴＯであり、１日は対向透明基
板としてガラス基板、１９は電子ビーム蒸着法によって
形成された酸化ケイ素膜層である。FIG. 1 shows a cross-sectional structure of a reflective liquid crystal display device according to an embodiment of the present invention. In Figure 1, 1
1 is a glass substrate as an insulating substrate, 12 is a wiring electrode, 13
is a TPT and an auxiliary capacitor as a switching element, 14
1 is an amorphous silicon nitride film as an insulating layer, 15 is a reflective pixel electrode, 16 is a liquid crystal layer, 17 is an ITO film formed by sputtering as a counter common electrode, and 1 is a glass substrate as a counter transparent substrate. 19 is a silicon oxide film layer formed by electron beam evaporation.
さらに、補助容量は配線電極１２上に形成されている。Further, an auxiliary capacitor is formed on the wiring electrode 12.
以上のように構成された反射形液晶表示デバイスについ
て１．その動作は従来例の動作と同様である。Regarding the reflective liquid crystal display device configured as described above: 1. Its operation is similar to that of the conventional example.
以上のように本実施例によれば、ガラス基板と非晶質窒
化ケイ素膜層との間に酸化ケイ素膜層を設けることによ
り、光がガラス基板側・＼透過していく、すなわち、光
のＴＦＴ側内部への進入を抑えることができ、スイッチ
ング素子の光伝導による漏れｔｌｔ流を防ぐことができ
る。As described above, according to this embodiment, by providing the silicon oxide film layer between the glass substrate and the amorphous silicon nitride film layer, light passes through the glass substrate side. Entry into the TFT side can be suppressed, and leakage tlt flow due to photoconduction of the switching element can be prevented.
なお、反射防止膜として酸化ケイ素膜という酸化物を用
いたが、透過率が高く、絶縁性のよい有機物でもよい。Although an oxide called a silicon oxide film was used as the antireflection film, an organic material with high transmittance and good insulation properties may be used.
発明の効果
以上のように本発明は反射形液晶表示デバイスにおいて
、反射画素電極が形成されている絶縁基板と絶縁体層ま
たはスイッチング素子との界面に光の反射を防止するた
めの物質からなる反射防止膜を形成することにより、液
晶層側から絶縁層を通ってアレイ内部へ進入した光が絶
縁基板と絶縁体層の界面で反射せずに、絶縁基板側へ透
過していり、シたがって、スイッチング素子が光伝導に
より抵抗が下がることによる漏れ電流を防ぐことができ
、コントラストの優れた反射型液晶表示デバイスを実現
できるものである。Effects of the Invention As described above, in a reflective liquid crystal display device, the present invention provides a reflective liquid crystal display device comprising a reflective material for preventing light reflection at the interface between an insulating substrate on which a reflective pixel electrode is formed and an insulating layer or a switching element. By forming the prevention film, light that enters the array from the liquid crystal layer side through the insulating layer is transmitted to the insulating substrate side without being reflected at the interface between the insulating substrate and the insulating layer. , it is possible to prevent leakage current due to the reduction in resistance of the switching element due to photoconduction, and it is possible to realize a reflective liquid crystal display device with excellent contrast.
第１図は本発明の一実施例における反射型液晶表示デバ
イスの断面図、第２図は従来の反射型液晶表示デバイス
を示す断面図、第３図は従来の反射型液晶デバイスにお
ける光の進入経路についての説明図である。
１１・・・・・・ガラス基板、１２・・・・・・配線電
極、１３・・・・・・ＴＦＴ、１４・・・・・・非晶質
窒化ケイ素膜層、１５・・・・・反射画素電極、１６・
・・・・・液晶層、１７・・・・・・対向共通電極、１
８・・・・・・対向ガラス基板、１９・・・・・・酸化
ケイ素膜層。
代理人の氏名 弁理士 粟野重孝 はか１名１１−−１
′ラス■石死
Ｉｔ−−配蛾貧罹
ｌ３−ＴＦＴｕＪＴｐ畑家ｔ
４− ・・’ｊ ＦＡ Ｙ ｆｋ ケ４ ｊ ７１Ｉ！
’１ｆｌＬ−文丁件１ｒラヌ屡石（
ｌｑ−ＮＪニア（Ｊ ＦＪ＊ＡFIG. 1 is a cross-sectional view of a reflective liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a conventional reflective liquid crystal display device, and FIG. 3 is a cross-sectional view of a conventional reflective liquid crystal display device. It is an explanatory diagram about a route. 11...Glass substrate, 12...Wiring electrode, 13...TFT, 14...Amorphous silicon nitride film layer, 15... reflective pixel electrode, 16.
...Liquid crystal layer, 17...Counter common electrode, 1
8... Counter glass substrate, 19... Silicon oxide film layer. Name of agent: Patent attorney Shigetaka Awano Haka111--1
'Rus ■ stone death It--Sei moth impoverishment l3-TFTuJTp Hata family t4-...'j FA Y fk ke4 j 71I!
'1flL-Bunting matter 1r Ranu 屡石(lq-NJnia(J FJ*A
Claims (4)
れている反射画素電極群と、前記画素電極に信号を供給
するためのスイッチング素子群とを具備した基板と、液
晶を介して一定の間隔を有して前記基板と対向し、共通
電極を有している基板とで構成されており、前記反射画
素電極が形成されている絶縁基板と絶縁体層またはスイ
ッチング素子との界面に光の反射を防止するための物質
からなる反射防止膜とを備えたことを特徴とする反射型
液晶表示デバイス。(1) A substrate equipped with a group of reflective pixel electrodes arranged in a matrix for displaying liquid crystal, and a group of switching elements for supplying signals to the pixel electrodes, and a substrate provided with a fixed interval through the liquid crystal. and a substrate facing the substrate and having a common electrode, and reflecting light at the interface between the insulating substrate on which the reflective pixel electrode is formed and the insulating layer or the switching element. A reflective liquid crystal display device comprising an antireflection film made of a substance for preventing reflection.
ド、非線形スイッチング素子で形成されていることを特
徴とする請求項（１）記載の反射型液晶表示デバイス。(2) The reflective liquid crystal display device according to claim (1), wherein the switching element is formed of a thin film transistor, a diode, or a nonlinear switching element.
ことを特徴とする請求項（２）記載の反射型液晶表示デ
バイス。(3) The reflective liquid crystal display device according to claim (2), wherein a plurality of switching elements are formed in each pixel.
れていることを特徴とする請求項（１）記載の反射型液
晶表示デバイス。(4) The reflective liquid crystal display device according to claim (1), wherein an auxiliary capacitor is formed in each display pixel of the reflective pixel electrode group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63321176A JPH02165123A (en) | 1988-12-20 | 1988-12-20 | Reflection type liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63321176A JPH02165123A (en) | 1988-12-20 | 1988-12-20 | Reflection type liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02165123A true JPH02165123A (en) | 1990-06-26 |
Family
ID=18129641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63321176A Pending JPH02165123A (en) | 1988-12-20 | 1988-12-20 | Reflection type liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02165123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433115C (en) * | 2002-02-07 | 2008-11-12 | Nec液晶技术株式会社 | Liquid crystal display equipment capable of effectively preventing irregularity of color |
| JP2014029530A (en) * | 1996-10-22 | 2014-02-13 | Seiko Epson Corp | Substrate for liquid crystal panel, liquid crystal panel, electronic apparatus, and projection type display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57139787A (en) * | 1981-02-24 | 1982-08-28 | Matsushita Electric Ind Co Ltd | Reflection type matrix display device |
| JPS63243902A (en) * | 1987-03-30 | 1988-10-11 | Toppan Printing Co Ltd | Color filter for display device |
-
1988
- 1988-12-20 JP JP63321176A patent/JPH02165123A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57139787A (en) * | 1981-02-24 | 1982-08-28 | Matsushita Electric Ind Co Ltd | Reflection type matrix display device |
| JPS63243902A (en) * | 1987-03-30 | 1988-10-11 | Toppan Printing Co Ltd | Color filter for display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014029530A (en) * | 1996-10-22 | 2014-02-13 | Seiko Epson Corp | Substrate for liquid crystal panel, liquid crystal panel, electronic apparatus, and projection type display device |
| CN100433115C (en) * | 2002-02-07 | 2008-11-12 | Nec液晶技术株式会社 | Liquid crystal display equipment capable of effectively preventing irregularity of color |
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