JPH0752266B2 - Reflective liquid crystal display device - Google Patents
Reflective liquid crystal display deviceInfo
- Publication number
- JPH0752266B2 JPH0752266B2 JP5042789A JP5042789A JPH0752266B2 JP H0752266 B2 JPH0752266 B2 JP H0752266B2 JP 5042789 A JP5042789 A JP 5042789A JP 5042789 A JP5042789 A JP 5042789A JP H0752266 B2 JPH0752266 B2 JP H0752266B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- display device
- reflective
- crystal display
- pixel electrode
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 31
- 239000000758 substrate Substances 0.000 claims description 16
- 239000012212 insulator Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 230000031700 light absorption Effects 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective liquid crystal display device having an active element used for 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。The conventional reflective liquid crystal display device will be described 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、１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は反射画素電極、６は液晶層、７
は対向共通電極、８は対向透明基板、９はブラックマト
リックスである。FIG. 2 is a cross-sectional view of a conventional reflective liquid crystal display device. 1 is an insulating substrate, 2 is a wiring electrode, 3 is a switching element, 4 is an insulating layer, 5 is a reflective pixel electrode, 6 is a liquid crystal layer, and 7 is a liquid crystal layer.
Is an opposing common electrode, 8 is an opposing transparent substrate, and 9 is a black matrix.
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、画像が得られる。対向透明電極基板８上のブ
ラックマトリックス９は反射画素電極５部分以外で生じ
る色むらを隠すためのものである。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 counter common electrode 7,
The liquid crystal works. At this time, light for making the display easy to see is emitted from the opposing 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 is generated between the light and the unpolarized pixel, and an image is obtained. The black matrix 9 on the counter transparent electrode substrate 8 is for hiding color unevenness that occurs in portions other than the reflective pixel electrode 5 portion.
発明が解決しようとする課題 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TFT内部に進入するため、
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。However, in the above-mentioned conventional configuration, light enters the TFT from the liquid crystal layer side through the insulating layer between the reflective electrodes,
Light acts on the switching element to reduce the electrical resistance of the semiconductor layer forming the switching element (photoconduction).
As a result, the electric charge stored in the pixel electrode and the counter common electrode leaks through the switching element, and as a result, the orientation of the liquid crystal is changed and the contrast is lowered.
本発明は上記従来の問題点を解決するものでディスプレ
イ画面のコントラスト低下を解消するとともにブラック
マトリックスが同時に形成することができ、工程の簡略
化も実現することの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。The present invention solves the above-mentioned conventional problems and provides a reflective liquid crystal display device capable of solving the deterioration of the contrast of the display screen, simultaneously forming a black matrix, and simplifying the process. The purpose is to
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、反射画素電極とこれに接続されたスイッチング
素子との中間層に設けられた光吸収係数の高い、不透明
な絶縁物から構成されている。Means for Solving the Problems In order to achieve this object, a reflective liquid crystal display device of the present invention is provided with an opaque material having a high light absorption coefficient provided in an intermediate layer between a reflective pixel electrode and a switching element connected to the reflective pixel electrode. It is composed of various insulating materials.
作用 この構成によって、入射光及び反射光が反射電極間の絶
縁層からアレイ内部に進入することを防ぎ、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。Operation With this configuration, it is possible to prevent incident light and reflected light from entering the inside of the array through the insulating layer between the reflection electrodes, and prevent leakage current caused by photoconduction of the switching element.
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 A reflective liquid crystal display device according to an example of the present invention will be described below 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、11
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薄膜トランジスタ（以下、TFTとい
う）および補助容量、14は黒色絶縁体として、スパッタ
により形成されたPrMnO3、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、18は対向透明基板としてガラス基板であ
る。FIG. 1 shows a cross-sectional structure of a reflective liquid crystal display device in one embodiment of the present invention. In FIG. 1, 11
Is a glass substrate as an insulating substrate, 12 is a wiring electrode, 13 is a thin film transistor (hereinafter referred to as TFT) and a storage capacitor as a switching element, 14 is a black insulator, PrMnO 3 formed by sputtering, 15 is a reflective pixel electrode, 16 Is a liquid crystal layer, 17 is an ITO formed by sputtering as a counter common electrode, and 18 is a glass substrate as a counter transparent substrate.
さらに、補助容量は配線電極12上に形成されている。Further, the auxiliary capacitance is formed on the wiring electrode 12.
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、その動作は従来例の動作と同様である。The operation of the reflective liquid crystal display device configured as described above is similar to that of the conventional example.
以上のように本実施例によれば、反射画素電極とスイッ
チング素子の中間層に黒色絶縁体PrMnO3で形成するによ
り、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電流が防ぐことができ
る。As described above, according to the present embodiment, by forming the black insulator PrMnO 3 in the intermediate layer between the reflective pixel electrode and the switching element, it is possible to suppress the entry of light into the TFT side, and the photoconduction of the switching element. Leakage current can be prevented.
また、黒色絶縁体をTFT側基板の反射画素電極間に形成
することにより、対向透明基板上にブラックマトリック
スの形成工程が削減でき、TFT側基板と対向透明基板と
のアライメントが不用となり、製造工程の簡略化が図れ
る。In addition, by forming a black insulator between the reflective pixel electrodes of the TFT side substrate, the process of forming the black matrix on the counter transparent substrate can be reduced, and the alignment between the TFT side substrate and the counter transparent substrate becomes unnecessary, and the manufacturing process Can be simplified.
なお、黒色絶縁体としてPrMnO2という酸化物を用いた
が、光吸収が高く、絶縁性のよい有機物でもよい。Although an oxide called PrMnO 2 is used as the black insulator, an organic substance having a high light absorption and a good insulating property may be used.
発明の効果 以上のように本発明は反射型液晶表示デバイスにおい
て、反射画素電極とこれに接続されたスイッチング素子
との中間層に光吸収係数の高い、不透明な絶縁物を設け
ることにより、液晶層側からの光が絶縁層を通ってアレ
イ内部へ進入することを防ぎ、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
できる。更に、対向透明基板側に形成していたブラック
マトリックスを不要にすることができ、製造工程の簡略
化に大きく貢献し、生産のコストを低減できるなど、数
々の優れた効果を得ることのできる反射型液晶表示デバ
イスを実現できるものである。As described above, according to the present invention, in the reflective liquid crystal display device, by providing an opaque insulator having a high light absorption coefficient in the intermediate layer between the reflective pixel electrode and the switching element connected thereto, the liquid crystal layer Light from the side can be prevented from entering the inside of the array through the insulating layer, and leakage current due to the resistance of the switching element being lowered by photoconduction can be prevented. Furthermore, the black matrix that was formed on the opposing transparent substrate side can be eliminated, which greatly contributes to the simplification of the manufacturing process and can reduce the production cost. Type liquid crystal display device can be realized.
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
を示す断面図である。 11……ガラス基板、12……配線電極、13……TFT、14…
…PrMnO3、15……反射画素電極、16……液晶層、17……
対向共通電極、18……対向ガラス基板。FIG. 1 is a sectional view of a reflective liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional reflective liquid crystal display device. 11 …… Glass substrate, 12 …… Wiring electrode, 13 …… TFT, 14…
… PrMnO 3 , 15 …… Reflective pixel electrode, 16 …… Liquid crystal layer, 17 ……
Opposing common electrode, 18 ... Opposing glass substrate.
Claims (4)
配列さ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
記反射画素電極とこれに接続されたスイッチング素子と
の中間層に光吸収係数の高い、不透明な絶縁物とを備え
たことを特徴とする反射型液晶表示デバイス。1. A substrate having a group of reflective pixel electrodes arranged in a matrix for displaying liquid crystal, and a group of switching elements for supplying a signal to the pixel electrode, and a substrate having a constant size through the liquid crystal. An intermediate layer between the reflective pixel electrode and a switching element connected to the reflective pixel electrode and a switching element connected to the reflective pixel electrode, which has a high light absorption coefficient and is opaque. Reflective liquid crystal display device characterized by comprising a transparent insulator.
イオード、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 reflection type liquid crystal display device according to claim 1, wherein the switching element is formed of a thin film transistor, a diode and a non-linear switching element.
ている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. A reflective liquid crystal display device according to claim 2, wherein a plurality of switching elements are formed in each pixel.
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。4. A reflective liquid crystal display device according to claim 1, wherein an auxiliary capacitance is formed in each display pixel of the reflective pixel electrode group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5042789A JPH0752266B2 (en) | 1989-03-02 | 1989-03-02 | Reflective liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5042789A JPH0752266B2 (en) | 1989-03-02 | 1989-03-02 | Reflective liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02230126A JPH02230126A (en) | 1990-09-12 |
| JPH0752266B2 true JPH0752266B2 (en) | 1995-06-05 |
Family
ID=12858571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5042789A Expired - Fee Related JPH0752266B2 (en) | 1989-03-02 | 1989-03-02 | Reflective liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0752266B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04322219A (en) * | 1991-04-22 | 1992-11-12 | Matsushita Electric Ind Co Ltd | Black matrix and its manufacturing method |
| ATE244928T1 (en) * | 1996-05-14 | 2003-07-15 | Micron Technology Inc | FIELD EMISSION DEVICES WITH PRASEODYMUM MANGANEOUS OXIDE LAYER |
| US5668437A (en) | 1996-05-14 | 1997-09-16 | Micro Display Technology, Inc. | Praseodymium-manganese oxide layer for use in field emission displays |
| JP3856889B2 (en) | 1997-02-06 | 2006-12-13 | 株式会社半導体エネルギー研究所 | Reflective display device and electronic device |
| JP2001194662A (en) | 2000-01-14 | 2001-07-19 | Nec Corp | Reflection type liquid crystal display device and its manufacturing method |
| JP3626652B2 (en) | 2000-01-21 | 2005-03-09 | 日本電気株式会社 | Reflective liquid crystal display device and manufacturing method thereof |
-
1989
- 1989-03-02 JP JP5042789A patent/JPH0752266B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02230126A (en) | 1990-09-12 |
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Legal Events
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|---|---|---|---|
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Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
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| LAPS | Cancellation because of no payment of annual fees |