JP2529184B2 - Transmissive liquid crystal display device - Google Patents
Transmissive liquid crystal display deviceInfo
- Publication number
- JP2529184B2 JP2529184B2 JP60073864A JP7386485A JP2529184B2 JP 2529184 B2 JP2529184 B2 JP 2529184B2 JP 60073864 A JP60073864 A JP 60073864A JP 7386485 A JP7386485 A JP 7386485A JP 2529184 B2 JP2529184 B2 JP 2529184B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- display device
- display element
- light guide
- 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
-
- 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
- G02F1/133757—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different alignment orientations
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Liquid Crystal (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (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 本発明は透過型液晶表示装置に関するものである。The present invention relates to a transmissive liquid crystal display device.
従来の技術 近年、液晶ディスプレイは低電力でもって表示できる
ことから、従来より時計，電卓などに多く利用されてき
た。そして、最近は多数の液晶表示装置を配設してなる
大型液晶ディスプレイが開発されるようになってきた。
これは一度に大勢の人々に情報を提供する公共的，社会
的ニーズに応えようとするためである。2. Description of the Related Art In recent years, liquid crystal displays have been widely used in watches, calculators, etc. since they can be displayed with low power. Then, recently, a large-sized liquid crystal display including a large number of liquid crystal display devices has been developed.
This is to meet the public and social needs of providing information to a large number of people at once.
このような大型液晶表示ディスプレイを構成する透過
型液晶表示装置を多数配設すると、各装置に含有するシ
ール枠が格子状の無表示部を形成してしまう。そこで、
本発明者らが特願昭59−61479号で提案したように、表
示装置内の表示素子に含まれる複数の絵素面積、つまり
表示面積を拡大する目的のライトガイドを表示部を覆う
ように設けることにより、複数の表示装置を配設して
も、連続的な大画面を形成することが可能になった。し
かしながら、１つの液晶表示素子内での輝度むらがわず
かに存在し、液晶表示素子の上半部に輝度低下が生じ、
大画面で見ると画面に横縞状に暗部が起こる問題点があ
った。When many transmissive liquid crystal display devices that constitute such a large-sized liquid crystal display are arranged, the seal frame included in each device forms a grid-shaped non-display portion. Therefore,
As proposed by the present inventors in Japanese Patent Application No. 59-61479, a plurality of picture element areas included in a display element in a display device, that is, a light guide for the purpose of enlarging the display area should cover the display section. By providing it, it becomes possible to form a continuous large screen even if a plurality of display devices are provided. However, there is a slight unevenness in brightness within one liquid crystal display element, which causes a decrease in brightness in the upper half of the liquid crystal display element.
When viewed on a large screen, there was a problem in which dark areas appeared in horizontal stripes on the screen.
以下、図面を参照しながら、上述したような本発明者
らが提案した透過型液晶表示装置について説明する。Hereinafter, the transmission type liquid crystal display device proposed by the present inventors will be described with reference to the drawings.
第６図は本発明者らの提案による大型液晶ディスプレ
イに使用されていた透過型液晶表示装置の構成図であ
る。この透過型液晶表示装置は、まず光源１からの光を
透過する２枚のガラス板2a,2bの周辺にシール樹脂３を
配して一定のギャップを形成している。上記２枚のガラ
ス板2a,2bの内面には透明な電極4a,4bが薄膜で形成され
ており、その上に配向膜5a,5bが設けられている。この
配向膜5a,5bの配向方向は後述する液晶６がゲスト−ホ
スト（Ｇ−Ｈ）タイプの場合には、第７図に示すように
全面側配向膜5aの配向方向Ａと光源側配向膜5bの配向方
向Ｂは相反するものである。また、液晶６にツイスト・
ネマチック（TN）タイプを用いた場合には第８図に示す
ように配向方向A,Bが直交するものである。このように
構成された２枚のガラス板2a,2bの内部に液晶６を封入
し、ガラス板2bの外側面には偏向板７が取付けられてい
る。さらに、ガラス板2aの両端には電極取出し部８があ
る。ここで、以上の構成をなすものを液晶表示素子９と
している。FIG. 6 is a configuration diagram of a transmissive liquid crystal display device used in a large-sized liquid crystal display proposed by the present inventors. In this transmissive liquid crystal display device, first, a sealing resin 3 is arranged around two glass plates 2a and 2b which transmit the light from the light source 1 to form a constant gap. Transparent electrodes 4a and 4b are formed as thin films on the inner surfaces of the two glass plates 2a and 2b, and alignment films 5a and 5b are provided thereon. When the liquid crystal 6 described later is a guest-host (GH) type, the alignment directions of the alignment films 5a and 5b are the alignment direction A of the alignment film 5a on the entire surface side and the alignment film of the light source side as shown in FIG. The orientation directions B of 5b are opposite to each other. Also, twist the liquid crystal 6
When the nematic (TN) type is used, the orientation directions A and B are orthogonal to each other as shown in FIG. A liquid crystal 6 is enclosed inside the two glass plates 2a and 2b thus configured, and a deflection plate 7 is attached to the outer surface of the glass plate 2b. Further, electrode lead-out portions 8 are provided at both ends of the glass plate 2a. Here, the liquid crystal display element 9 having the above configuration is used.
そして、この液晶表示素子９を複数で配設すると、大
画面の液晶表示素子となり、各液晶表示素子９の電極取
出し部８やシール樹脂３からなるシール枠が見えなくな
るように複数のライトガイド10をガラス板1aの全面に貼
付けている。このライトガイド10は内面に鏡面を設けた
筒状の固体または外面に鏡面を設けた高透過率の固体な
どからなり、かつ１つの液晶表示素子９に対して１つ以
上設けられ、光線を誘導する指向性をもっている。この
ライトガイド10は、アクリルなどの樹脂成型品からなる
筒状の固体の内面にアルミニウムを蒸着して設けたもの
が実用的である。When a plurality of the liquid crystal display elements 9 are arranged, a large screen liquid crystal display element is formed, and a plurality of light guides 10 are provided so that the electrode lead-out portion 8 of each liquid crystal display element 9 and the seal frame made of the seal resin 3 cannot be seen. Is pasted on the entire surface of the glass plate 1a. The light guide 10 is made of a cylindrical solid body having a mirror surface on the inner surface or a high transmittance solid body having a mirror surface on the outer surface, and one or more light guides are provided for one liquid crystal display element 9 to guide light rays. Have a directivity to The light guide 10 is practically provided by vapor-depositing aluminum on the inner surface of a cylindrical solid body made of a resin molded product such as acrylic.
発明が解決しようとする問題点 しかしながら、このような構成ではライトガイド10に
よる効果でシート枠は確認できないこととなるが、ライ
トガイド10の指向性が強く、かつライトガイド10の各要
素の内面または外面の反射率が100％になりえないの
で、配向方向に輝度むらが生じる。これは、一般的に液
晶表示素子９の配向方向における光量分布の中心が第９
図に示すように下向きになっており、またライトガイド
10の指向性はその目的から全方位拡散となっているた
め、液晶表示素子９の配向性とライトガイド10の指向性
が組合せられると、第10図のように液晶表示素子９の上
部では暗く、下部では明るいという輝度分布を示すこと
を意味している。このことは大画面表示で見た場合、画
面に横縞状に暗部が生じることになり、観察者に非常に
見苦しいという問題点を与えていた。Problems to be Solved by the Invention However, in such a configuration, the sheet frame cannot be confirmed due to the effect of the light guide 10, but the directivity of the light guide 10 is strong, and the inner surface of each element of the light guide 10 or Since the reflectance of the outer surface cannot be 100%, uneven brightness occurs in the alignment direction. This is because the center of the light amount distribution in the alignment direction of the liquid crystal display element 9 is generally the 9th.
It is facing down as shown and the light guide
Since the directivity of 10 is omnidirectional diffusion for that purpose, when the directivity of the liquid crystal display element 9 and the directivity of the light guide 10 are combined, it becomes dark in the upper part of the liquid crystal display element 9 as shown in FIG. , It means that the lower part shows a brightness distribution of being bright. This causes a horizontal striped dark portion on the screen when viewed in a large screen display, giving a problem that it is very unsightly to an observer.
本発明はこのような従来の問題点を解消するものであ
り、複数のライトガイドをもつ液晶表示素子を配設する
際における配向方向の輝度段差を緩和することを可能と
する透過型液晶表示装置を提供しようとするものであ
る。The present invention solves such a conventional problem, and a transmissive liquid crystal display device capable of reducing a luminance step in an alignment direction when a liquid crystal display element having a plurality of light guides is arranged. Is to provide.
問題点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透過型液晶表示装
置は、光源からの光線を透過するガラス板間に液晶を配
した液晶表示素子を同一平面上に多数配設し、前記各液
晶表示素子の表示部を、前記表示部を通過した光線を誘
導し前記液晶表示素子の表示面積を拡大するライトガイ
ドで覆い、前記液晶表示素子が、前記ライトガイドの指
向性と整合させたラビング処理を施した配向膜を有する
構成としたものである。In order to achieve this object, a transmissive liquid crystal display device according to the present invention has a large number of liquid crystal display elements in which liquid crystal is arranged between glass plates that transmit light rays from a light source on the same plane. The display section of each liquid crystal display element is covered with a light guide that guides a ray of light that has passed through the display section to expand the display area of the liquid crystal display element, and the liquid crystal display element has directivity of the light guide. It is configured to have an alignment film that has been subjected to a rubbing treatment matched with the above.
作用 この構成によれば、液晶表示素子の配向方向を２分割
し、上記液晶表示素子の上半部の良視野方位を上向きに
するように配向させたことにより、ライトガイドの指向
性と整合させることができるため、液晶表示素子の輝度
むらを解消し、また液晶表示素子を複数配設させた時に
起こる横縞模様の暗部を緩和させることができることと
なる。Operation According to this configuration, the alignment direction of the liquid crystal display element is divided into two, and the good viewing direction of the upper half of the liquid crystal display element is oriented upward, thereby matching the directivity of the light guide. Therefore, it is possible to eliminate the uneven brightness of the liquid crystal display element and to alleviate the dark portion of the horizontal stripe pattern that occurs when a plurality of liquid crystal display elements are arranged.
実施例 以下、本発明の一実施例について図面を参照しながら
説明する。ここで、本発明の実施例において上記と同一
箇所には同一番号を付して説明を省略する。Embodiment An embodiment of the present invention will be described below with reference to the drawings. Here, in the embodiment of the present invention, the same parts as those described above are designated by the same reference numerals and the description thereof will be omitted.
第１図は本発明の一実施例を示す。まず、上記構成の
液晶表示素子９の配向膜5a,5bの配向方向を上下方向に
２分割し、配向膜5aを5a′と5a″にし、配向膜5bを5b′
と5b″にする。そして、上記液晶６にＧ−Ｈタイプを用
いた場合には、第２図に示すように配向膜5a′,5b″の
配向方向Ａ′,B″を下向き、配向膜5a″,5b′の配向方
向Ａ″,B′を上向きにラビング処理し、上半部の良視野
方位を上向き、下半部の良視野方位を下向きとなるよう
に配向させている。FIG. 1 shows an embodiment of the present invention. First, the alignment directions of the alignment films 5a and 5b of the liquid crystal display element 9 having the above structure are divided into two parts in the vertical direction, the alignment films 5a are made into 5a 'and 5a ", and the alignment films 5b are made into 5b'.
And 5b ″. When the GH type liquid crystal is used for the liquid crystal 6, as shown in FIG. 2, the orientation directions A ′ and B ″ of the orientation films 5a ′ and 5b ″ are directed downward and The orientations A ″ and B ′ of the 5a ″ and 5b ′ are rubbed upward so that the good visual field azimuth of the upper half portion is oriented upward and the good visual field orientation of the lower half portion is oriented downward.
また、液晶６にTNタイプを用いた場合には第３図に示
すようにラビング処理を行い、上下方向で配向を２分割
している。そして、第１図のようにガラス板2aと2bのよ
うに液晶６の封入後、貼合わせる。上記配向方向Ａ′,
A″は全面側配向膜5a′,5b″、配向方向Ｂ′,B″は光源
側配向膜5b′,5b″による配向方向を示しているのは上
述した通りである。ここで、配向膜5a′,5a″,5b′と5
b″の分離線ｃはできるかぎり細くし、表示部に影響を
与えないようにすることが必要である。When a TN type liquid crystal 6 is used, a rubbing process is performed as shown in FIG. 3 to divide the alignment into two in the vertical direction. Then, as shown in FIG. 1, the glass plates 2a and 2b are sealed with the liquid crystal 6 and then bonded. The orientation direction A ′,
As described above, A ″ represents the alignment films 5a ′ and 5b ″ on the entire surface and the alignment directions B ′ and B ″ represent the alignment directions by the light source alignment films 5b ′ and 5b ″. Here, the alignment films 5a ′, 5a ″, 5b ′ and 5
It is necessary to make the separation line c of b ″ as thin as possible so as not to affect the display portion.
以上の構成の上、上記と同様に上記ガラス板1aの前面
に上述したライトガイド10を貼付けている。このライト
ガイド10を付加した液晶表示素子９を同一平面上に多数
配設すると、大画面の液晶表示装置となり、シール枠が
認められないものとなる。With the above configuration, the light guide 10 is attached to the front surface of the glass plate 1a in the same manner as above. If a large number of liquid crystal display elements 9 to which the light guide 10 is added are arranged on the same plane, a large screen liquid crystal display device is obtained, and the seal frame cannot be recognized.
第４図，第５図に本発明による液晶表示素子９および
ライトガイドの配向方向と、液晶表示素子とライトガイ
ド10との組合せによる輝度分布の状態を示している。4 and 5 show the orientation directions of the liquid crystal display element 9 and the light guide according to the present invention, and the state of the luminance distribution by the combination of the liquid crystal display element and the light guide 10.
発明の効果 以上のように本発明の透過型液晶表示装置は構成され
ているものであり、液晶表示素子の配向方向を２分割
し、上半部の良視野方位を上向きにすることにより、ガ
ラス板の全面に設置するライトガイドの指向性と整合を
とることができるため、輝度むらを解消することができ
る。また、大画面表示とした場合に画面全体の輝度をほ
ぼ均等にし、横縞状の暗部が生じるのを緩和させること
ができるため、画像全体を良好なものとすることができ
る。The transmissive liquid crystal display device of the present invention is configured as described above, and by dividing the alignment direction of the liquid crystal display element into two and setting the good viewing azimuth of the upper half portion upward, Since it is possible to match the directivity of the light guide installed on the entire surface of the plate, it is possible to eliminate uneven brightness. Further, in the case of a large-screen display, the brightness of the entire screen can be made substantially uniform and the occurrence of horizontal stripe-shaped dark portions can be mitigated, so that the entire image can be made good.
第１図は本発明による透過型液晶表示装置の一実施例を
示す概略構成図、第２図は同装置を構成するＧ−Ｈタイ
プの液晶表示素子の配向方向を示す図、第３図は同じく
TNタイプの液晶表示素子の配向方向を示す図、第４図は
本発明による液晶表示素子とライトガイドの配向方向を
示す図、第５図は同じく液晶表示素子とライトガイドと
を組合せた際の輝度分布の状態を示す図、第６図は本発
明者らが先に提案した透過型液晶表示装置の構成を示す
概略構成図、第７図は同装置を構成するＧ−Ｈタイプの
液晶表示素子の配向方向を示す図、第８図は同じくTNタ
イプの液晶表示素子の配向方向を示す図、第９図は同じ
く液晶表示素子とライトガイドの配向方向を示す図、第
10図は同じく液晶表示素子とライトガイドとを組合せた
際の輝度分布の状態を示す図である。 １……光源、2a,2b……ガラス板、３……シール樹脂、
４……透明電極、5a,5a′,5a″,5b,5b′、5b″……配向
膜、６……液晶、７……偏光板、８……電極取出し部、
９……液晶表示素子、10……ライトガイド。FIG. 1 is a schematic configuration diagram showing an embodiment of a transmissive liquid crystal display device according to the present invention, FIG. 2 is a diagram showing an alignment direction of a GH type liquid crystal display element constituting the device, and FIG. Also
FIG. 4 is a diagram showing the alignment direction of a TN type liquid crystal display device, FIG. 4 is a diagram showing the alignment direction of the liquid crystal display device according to the present invention and a light guide, and FIG. 5 is a view showing the same when the liquid crystal display device and the light guide are combined. FIG. 6 is a diagram showing the state of the luminance distribution, FIG. 6 is a schematic configuration diagram showing the configuration of the transmission type liquid crystal display device previously proposed by the present inventors, and FIG. 7 is a GH type liquid crystal display constituting the device. FIG. 8 is a diagram showing the orientation direction of the device, FIG. 8 is a diagram showing the orientation direction of the TN type liquid crystal display device, and FIG. 9 is a diagram showing the orientation direction of the liquid crystal display device and the light guide.
Similarly, FIG. 10 is a diagram showing a state of luminance distribution when the liquid crystal display element and the light guide are combined. 1 ... Light source, 2a, 2b ... Glass plate, 3 ... Seal resin,
4 ... Transparent electrodes, 5a, 5a ', 5a ", 5b, 5b', 5b" ... Alignment film, 6 ... Liquid crystal, 7 ... Polarizing plate, 8 ... Electrode extraction part,
9: Liquid crystal display element, 10: Light guide.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−61479（ＪＰ，Ａ) 特開 昭59−204823（ＪＰ，Ａ) 特開 昭60−217341（ＪＰ，Ａ) 実開 昭49−112246（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-61479 (JP, A) JP-A-59-204823 (JP, A) JP-A-60-217341 (JP, A) Actual development Sho-49- 112246 (JP, U)
Claims (1)
晶を配した液晶表示素子を同一平面上に多数配設し、前
記各液晶表示素子の表示部を、前記表示部を通過した光
線を誘導し前記液晶表示素子の表示面積を拡大するライ
トガイドで覆い、前記液晶表示素子が、前記ライトガイ
ドの指向性と整合させたラビング処理を施した配向膜を
有することを特徴とする透過型液晶表示装置。1. A plurality of liquid crystal display elements, each of which has a liquid crystal disposed between glass plates that transmit a light beam from a light source, are arranged on the same plane, and a light beam that passes through the display section of each of the liquid crystal display elements. And a liquid crystal display element covered with a light guide for enlarging the display area of the liquid crystal display element, the liquid crystal display element having a rubbing-processed alignment film that matches the directivity of the light guide. Liquid crystal display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60073864A JP2529184B2 (en) | 1985-04-08 | 1985-04-08 | Transmissive liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60073864A JP2529184B2 (en) | 1985-04-08 | 1985-04-08 | Transmissive liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61232420A JPS61232420A (en) | 1986-10-16 |
| JP2529184B2 true JP2529184B2 (en) | 1996-08-28 |
Family
ID=13530463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60073864A Expired - Fee Related JP2529184B2 (en) | 1985-04-08 | 1985-04-08 | Transmissive liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2529184B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2550654B2 (en) * | 1988-04-25 | 1996-11-06 | 三菱電機株式会社 | Liquid crystal display element |
| JPH02136287U (en) * | 1989-04-19 | 1990-11-14 | ||
| US5481385A (en) * | 1993-07-01 | 1996-01-02 | Alliedsignal Inc. | Direct view display device with array of tapered waveguide on viewer side |
| JP5682232B2 (en) * | 2010-10-29 | 2015-03-11 | ソニー株式会社 | Liquid crystal light control device and imaging apparatus |
-
1985
- 1985-04-08 JP JP60073864A patent/JP2529184B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61232420A (en) | 1986-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |