JPH02130526A - Liquid crystal display element and projection type display device - Google Patents
Liquid crystal display element and projection type display deviceInfo
- Publication number
- JPH02130526A JPH02130526A JP63284512A JP28451288A JPH02130526A JP H02130526 A JPH02130526 A JP H02130526A JP 63284512 A JP63284512 A JP 63284512A JP 28451288 A JP28451288 A JP 28451288A JP H02130526 A JPH02130526 A JP H02130526A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- display element
- transparent
- 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.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 abstract description 10
- 239000012212 insulator Substances 0.000 abstract description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000007786 electrostatic charging Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、画像信号に応じた光学像を形成する液晶表示
素子及びその液晶表示素子を利用した投射型表示装置に
関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal display element that forms an optical image according to an image signal, and a projection type display device using the liquid crystal display element.
従来の技術 第３図に従来の液晶表示素子の断面図を示す。Conventional technology FIG. 3 shows a cross-sectional view of a conventional liquid crystal display element.
この従来例のアクティブ・マトリクス型の液晶表示素子
は、第３図に示すように、一方の透明基板１ａにスイッ
チング素子としての薄膜トランジスタ（ＴＰＴ）４、・
とそれに接続される絵素電極５をマトリクス状に形成す
る。As shown in FIG. 3, this conventional active matrix type liquid crystal display element includes a thin film transistor (TPT) 4 as a switching element on one transparent substrate 1a.
and picture element electrodes 5 connected thereto are formed in a matrix.
また、他方の透明基板１ｂには、透明共通電極３を形成
する。その後、この２枚の透明基板１ａ。Further, a transparent common electrode 3 is formed on the other transparent substrate 1b. After that, these two transparent substrates 1a.
１ｂの周辺部をシール材６で固着し、内部空間にツイス
ト−ネマティク（ＴＮ）モードの液晶２を封入する。透
明基板１ａ１ ｌｂの外側には偏光板７ａ１７ｂを配設
する。絵素電極Ｓと透明共通電極３との間に電圧が印加
されると、この両者の間に挟まれた液晶２の屈折率が変
化し、その結果、その絵素の透過率が変化し、画像表示
が可能となる。The peripheral portion of 1b is fixed with a sealing material 6, and a twisted nematic (TN) mode liquid crystal 2 is sealed in the internal space. A polarizing plate 7a17b is provided on the outside of the transparent substrate 1a1 lb. When a voltage is applied between the picture element electrode S and the transparent common electrode 3, the refractive index of the liquid crystal 2 sandwiched between them changes, and as a result, the transmittance of the picture element changes, Image display becomes possible.
発明が解決しようとする課題
液晶２を挟持する２枚の透明基板１ａ、ｌｂは絶縁体で
あるので、透明基板１ａ、ｌｂの外気に接する面上が帯
電し、埃等が多く付着する。これらの埃等は、画像を見
る上で目障りであり、画面の輝度の低下の原因となる。Problems to be Solved by the Invention Since the two transparent substrates 1a and 1b that sandwich the liquid crystal 2 are insulators, the surfaces of the transparent substrates 1a and 1b that are in contact with the outside air are charged and a lot of dust and the like adhere to them. These dust and the like are an eyesore when viewing images and cause a decrease in the brightness of the screen.
また、基板外面の帯電した領域に対応する基板内面の領
域にも、はぼ同一量の電荷が帯電される。この透明基板
が、ＴＰＴアレーが配設された基板であった場合、ＴＰ
Ｔアレー基板上に帯電した静電気によって、ゲート絶縁
膜破壊等によるＴＰＴの動作不良を生じさせ、液晶表示
素子の表示特性を著しく悪化させるという問題を引き起
こす。In addition, a region on the inner surface of the substrate corresponding to the charged region on the outer surface of the substrate is also charged with approximately the same amount of charge. If this transparent substrate is a substrate on which a TPT array is arranged, the TPT
The static electricity charged on the T-array substrate causes malfunction of the TPT due to breakdown of the gate insulating film, causing a problem of significantly deteriorating the display characteristics of the liquid crystal display element.
本発明は上記課題を解決するものであり、透明基板の帯
電にともなう品質の劣化のない表示特性の良好な液晶表
示素子及びそれを用いた投射型表示装置を提供すること
を目的とそるものである。The present invention is intended to solve the above-mentioned problems, and it is an object of the present invention to provide a liquid crystal display element with good display characteristics that does not deteriorate in quality due to charging of a transparent substrate, and a projection type display device using the same. be.
課題を解決するための手段
上記目的を達成するために本発明の液晶表示装置は、２
枚の透明基板の外気と接する面に透明導電膜を形成する
ものである。そしてこの液晶表示素子を用いて本発明の
投射型表示装置を構成する。Means for Solving the Problems In order to achieve the above objects, the liquid crystal display device of the present invention has the following features:
A transparent conductive film is formed on the surface of a transparent substrate that comes into contact with the outside air. The projection type display device of the present invention is constructed using this liquid crystal display element.
作用
上記の構成によって、液晶を挟持する２枚の透明基板の
外表面が導電性を有し、透明基板の外表面上が静電気で
帯電されなくなり、埃等の付着が抑制され画面の輝度の
低下等が防止できる。また、静電気によるＴＰＴの動作
不良も防止できる。Effect: With the above configuration, the outer surfaces of the two transparent substrates sandwiching the liquid crystal have conductivity, and the outer surfaces of the transparent substrates are not charged with static electricity, which suppresses the adhesion of dust and the like, reducing the brightness of the screen. etc. can be prevented. Furthermore, malfunction of the TPT due to static electricity can be prevented.
実施例
以下、本発明の一実施例の液晶表示素子及びこの液晶表
示素子を用いた投射型表示装置を図面とともに説明する
。第１図は本実施例のアクティブ・マ） ＩＪクス型液
晶表示素子の構造を示す断面図である。なお、第１図に
おいて第３図に示した従来例の構成と同様のものには同
符号を付してその説明を省略する。EXAMPLE Hereinafter, a liquid crystal display element according to an example of the present invention and a projection type display device using this liquid crystal display element will be explained with reference to the drawings. FIG. 1 is a sectional view showing the structure of the active matrix type liquid crystal display element of this embodiment. Components in FIG. 1 that are similar to the configuration of the conventional example shown in FIG. 3 are given the same reference numerals, and their explanations will be omitted.
本実施例の液晶表示素子においては二枚の透明基板１ａ
、１ｂの外気と接する面上には、−面にインジウム錫酸
化物（ＩＴＯ）からなる透明導電膜８ａ１８ｂが形成さ
れている。そしてその上に偏光板７ａｘ７ｂが配設され
ている。In the liquid crystal display element of this embodiment, two transparent substrates 1a
, 1b, a transparent conductive film 8a18b made of indium tin oxide (ITO) is formed on the - side on the surface that is in contact with the outside air. A polarizing plate 7ax7b is disposed thereon.
上記のような構成にすることによって、液晶表示素子を
構成する透明基板の外側面上が静電気で帯電されなくな
り、埃等の付着を防止することができ、この塵埃によっ
て生じる画面の輝度の低下等が防止できる。また、液晶
表示素子のスイッチング素子であるＴＰＴの静電気によ
る劣化も防止できる。With the above configuration, the outer surface of the transparent substrate that constitutes the liquid crystal display element is not charged with static electricity, and it is possible to prevent the adhesion of dust, etc., and reduce the brightness of the screen caused by this dust. can be prevented. Further, deterioration of TPT, which is a switching element of a liquid crystal display element, due to static electricity can also be prevented.
次に、上述の液晶表示素子を用いた投射型表示素子を第
２図を参照しながら説明する。すなわち、本実施例の投
射型表示装置は、大画面のテレビシロン画像を得るため
に、液晶表示素子ａにＴＶ映像を形成し、光源９からの
発散光をレンズ１ｏを用いて平行光に変え、この液晶表
示素子ａに入射し、液晶表示素子ａからの透過光を、レ
ンズ１１によってスクリーン１２上にテレビシロン画像
を拡大投射する−ものである。なおかつここで用いる液
晶表示素子は、第１図に示した透明基板上に透明導電膜
を存する液晶表示素子を用いるものである。Next, a projection type display element using the above-mentioned liquid crystal display element will be explained with reference to FIG. That is, in order to obtain a large-screen television image, the projection display device of this embodiment forms a TV image on the liquid crystal display element a, and converts diverging light from the light source 9 into parallel light using the lens 1o. , enters this liquid crystal display element a, and the transmitted light from the liquid crystal display element a is enlarged and projected onto a screen 12 by a lens 11. Furthermore, the liquid crystal display element used here is a liquid crystal display element having a transparent conductive film on a transparent substrate as shown in FIG. 1.
本実施例の投射型表示装置においても、液晶表示素子の
外面への埃等の付着を防止することができるために、そ
の結果、スクリーン上の画像の輝度の低下を防止する効
果を有する。また、このような装置に用いた場合、液晶
表示素子は装置の内部に組み込まれるため、この液晶表
示素子の外面の埃等を除去するのは困難であるため本発
明は有効である。In the projection type display device of this embodiment as well, it is possible to prevent dust and the like from adhering to the outer surface of the liquid crystal display element, and as a result, it has the effect of preventing a reduction in the brightness of the image on the screen. Further, when used in such a device, the present invention is effective because the liquid crystal display element is incorporated inside the device, and it is difficult to remove dust and the like from the outer surface of the liquid crystal display element.
なお本発明は、そのほか液晶表示素子の画像を光学系の
素子を用いて所定の位置に結像させる表示装置、例えば
虚像を形成するビデオカメラのビューファインダー 空
間光変調素子等にも有効である。The present invention is also effective in other display devices that form an image on a liquid crystal display element at a predetermined position using an optical system element, such as a viewfinder of a video camera that forms a virtual image, a spatial light modulation element, and the like.
発明の効果
本発明によれば、液晶表示素子の液晶を挟持する対向す
る２枚の透明基板の外気と接する面に。Effects of the Invention According to the present invention, on the surfaces in contact with the outside air of two opposing transparent substrates that sandwich the liquid crystal of a liquid crystal display element.
透明導電膜を形成することによって、絶縁体からなる透
明基板の外気に接する面上が帯電されなくなり、埃等の
付着を防止し画面の輝度の低下が防止できる。またアク
ティブ舎マトリクス型の液晶表示素子においては、スイ
ッチング素子またハ非線形素子の静電気による劣化によ
る表示劣化も防止できる。そして、この液晶表示を用い
た投射型表示装置においては、投射画像の輝度を良好に
保つことが可能である。By forming the transparent conductive film, the surface of the transparent substrate made of an insulator that is in contact with the outside air is not electrically charged, which prevents the adhesion of dust and the like, thereby preventing a decrease in the brightness of the screen. Furthermore, in an active matrix type liquid crystal display element, display deterioration due to deterioration of switching elements or nonlinear elements due to static electricity can be prevented. In a projection display device using this liquid crystal display, it is possible to maintain good brightness of a projected image.
第１図は本発明の第一の実施例における液晶表示素子の
構造を示す断面図、第２図は本発明の第一の実施例にお
ける投射型表示装置の構成を示す側面図、第３図は従来
の液晶表示素子の構造を示す断面図である
１ａ＋１ｂ・Φ・透明基板、２・・・ＴＮ液晶、３・・
・透明共通電極、４・・・薄膜トランジスタ（ＴＦＴ）
、５・・・絵素電極、６・・・シール材、 ７ａ、 ７
ｂ・拳・偏光板、 ８ａｔａｂ”・透明導電膜、９・・
Φ光源０・・・集光レンズ、１１・・・投射レンズ、１
２−−−スクリーン、ａｅｅ・アクティブ・マトリクス
型液晶表示素子。FIG. 1 is a cross-sectional view showing the structure of a liquid crystal display element in a first embodiment of the present invention, FIG. 2 is a side view showing the structure of a projection type display device in the first embodiment of the present invention, and FIG. 1a+1b, Φ, transparent substrate, 2...TN liquid crystal, 3...
・Transparent common electrode, 4...Thin film transistor (TFT)
, 5... Picture element electrode, 6... Seal material, 7a, 7
b・Fist・Polarizing plate, 8atab"・Transparent conductive film, 9...
Φ Light source 0... Condenser lens, 11... Projection lens, 1
2--Screen, AEE active matrix type liquid crystal display element.
Claims (2)
明基板と、１主面上に透明電極及スイッチング素子もし
くは非線形形素子が形成された第２の絶縁性透明基板と
を、前記透明電極を対向内面となるように対向させ、そ
の対向空間内に液晶を挟持し、前記第１、第２の基板の
両方または一方の外気と接する面に帯電防止膜を形成し
たことを特徴とする液晶表示素子。(1) A first insulating transparent substrate on which a transparent electrode is formed on one main surface, and a second insulating transparent substrate on which a transparent electrode and a switching element or a nonlinear element are formed on one main surface. , the transparent electrodes are arranged to face each other so as to form opposing inner surfaces, a liquid crystal is sandwiched in the opposing space, and an antistatic film is formed on the surface of both or one of the first and second substrates that is in contact with the outside air. Characteristic liquid crystal display element.
像を表示している請求項（１）に記載の液晶表示素子に
入射し、前記液晶表示素子からの出射光をレンズ系を用
いて所定の位置に投射し、液晶表示素子に表示された画
像を拡大結像させる投射型表示装置。(2) The light from the light source is incident on the liquid crystal display element according to claim (1), which displays an image by inputting an image signal from the outside, and the light emitted from the liquid crystal display element is transmitted using a lens system. A projection type display device that projects an image onto a predetermined position using a liquid crystal display device, and enlarges and forms an image displayed on a liquid crystal display element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63284512A JPH02130526A (en) | 1988-11-10 | 1988-11-10 | Liquid crystal display element and projection type display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63284512A JPH02130526A (en) | 1988-11-10 | 1988-11-10 | Liquid crystal display element and projection type display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02130526A true JPH02130526A (en) | 1990-05-18 |
Family
ID=17679462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63284512A Pending JPH02130526A (en) | 1988-11-10 | 1988-11-10 | Liquid crystal display element and projection type display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02130526A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07301791A (en) * | 1994-04-28 | 1995-11-14 | Samsung Electron Co Ltd | Projection-type macromolecular liquid crystal composite-film display panel |
| JP2003279942A (en) * | 2002-03-19 | 2003-10-02 | Seiko Epson Corp | Optoelectronic device, electronic apparatus and projection type display device |
| JP2008517306A (en) * | 2004-09-29 | 2008-05-22 | インダストリアル テクノロジー リサーチ インスティチュート | Antistatic layer for electrically modulated displays |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6314228B2 (en) * | 1979-12-28 | 1988-03-30 | Toyota Motor Co Ltd | |
| JPS63212918A (en) * | 1987-02-28 | 1988-09-05 | Canon Inc | Liquid crystal element |
-
1988
- 1988-11-10 JP JP63284512A patent/JPH02130526A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6314228B2 (en) * | 1979-12-28 | 1988-03-30 | Toyota Motor Co Ltd | |
| JPS63212918A (en) * | 1987-02-28 | 1988-09-05 | Canon Inc | Liquid crystal element |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07301791A (en) * | 1994-04-28 | 1995-11-14 | Samsung Electron Co Ltd | Projection-type macromolecular liquid crystal composite-film display panel |
| JP2003279942A (en) * | 2002-03-19 | 2003-10-02 | Seiko Epson Corp | Optoelectronic device, electronic apparatus and projection type display device |
| US7209202B2 (en) | 2002-03-19 | 2007-04-24 | Seiko Epson Corporation | Electro-optic device, electronic instrument, and projection display |
| US7391491B2 (en) | 2002-03-19 | 2008-06-24 | Seiko Epson Corporation | Electro-optic device, electronic instrument, and projection display |
| US7911571B2 (en) | 2002-03-19 | 2011-03-22 | Seiko Epson Corporation | Electro-optic device, electronic instrument, and projection display |
| US8310635B2 (en) | 2002-03-19 | 2012-11-13 | Seiko Epson Corporation | Electro-optic device, electronic instrument, and projection display |
| JP2008517306A (en) * | 2004-09-29 | 2008-05-22 | インダストリアル テクノロジー リサーチ インスティチュート | Antistatic layer for electrically modulated displays |
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