JP3030770B2 - Liquid crystal device and projection type display device - Google Patents
Liquid crystal device and projection type display deviceInfo
- Publication number
- JP3030770B2 JP3030770B2 JP9294043A JP29404397A JP3030770B2 JP 3030770 B2 JP3030770 B2 JP 3030770B2 JP 9294043 A JP9294043 A JP 9294043A JP 29404397 A JP29404397 A JP 29404397A JP 3030770 B2 JP3030770 B2 JP 3030770B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light
- crystal panel
- shielding film
- substrates
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
Landscapes
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【発明の詳細な説明】
【0001】
【発明の属する技術分野】本発明は、液晶パネル及び液
晶パネルを光シャッタとして用いた投射型表示装置に関
する。
【0002】
【従来の技術】従来の投射型表示装置は、図2に示すよ
うに光源21からの光を液晶表示装置22に照射し、液
晶パネルによる透過光量の制御による文字やパターンの
像をレンズ25により拡大投映するものである。
【0003】液晶表示装置22は図3に示すように液晶
パネル31に駆動用のICを実装した配線テープ32を
接続し、配線テープ32はさらにプリント配線基板33
に接続されている。液晶パネル31は有効表示領域34
と非駆動領域35,シール領域36,接続端子領域37
に大きく分かれる。
【0004】液晶パネルはそのコントラスト比を確保す
るため、TN(ツイステッドネマチック)方式で偏光板
を液晶パネルの両側に配置している。
【0005】
【発明が解決しようとする課題】しかし、前述の従来技
術では液晶表示装置の有効表示領域以外で光源からの光
を透過し、不要な投射像が表示されるという問題点を有
する。
【0006】これは、接続端子領域37からの透過光
や、2枚の偏向板の偏光方向を交差して使う場合の非駆
動領域35や、2枚の偏光板の偏光方向を平行にして使
う場合のシール領域36から透過する光がその原因とな
っている。
【0007】本発明は、このような問題点を解決するも
ので、その目的とするところは、不要な投射像の生じな
い投射型表示装置を提供することにある。
【0008】
【課題を解決するための手段】本発明は、一対の基板間
に液晶が封入されてなり、前記一対の基板の内面側の有
効表示領域の周辺領域に配置された遮光膜と前記一対の
基板の外面側の前記有効表示領域の周辺領域に配置され
た遮光手段とを具備する液晶パネルと、前記液晶パネル
に接続される配線基板とを有する液晶装置であって、前
記遮光手段の前記有効表示領域側の端部は、前記遮光膜
の前記有効表示領域側の端部よりも周辺側であって前記
遮光手段と前記遮光膜とは平面的にみて少なくとも一部
で重なるように配置されてなり、前記遮光手段は前記液
晶パネルと前記配線基板にまたがるように配置されて補
強機能を有することを特徴とする。本発明は、光源と、
前記光源からの光を入射する液晶装置と、前記液晶装置
により形成された像を投射する投射光学手段とを有する
投射型表示装置において、前記液晶装置は、一対の基板
間に液晶が封入されてなり、前記一対の基板の内面側の
有効表示領域の周辺領域に配置された遮光膜と前記一対
の基板の外面側の前記有効表示領域の周辺領域に配置さ
れた遮光手段とを具備する液晶パネルと、前記液晶パネ
ルに接続される配線基板とを有し、前記遮光手段の前記
有効表示領域側の端部は、前記遮光膜の前記有効表示領
域側の端部よりも周辺側であって前記遮光手段と前記遮
光膜とは平面的にみて少なくとも一部で重なるように配
置されてなり、前記遮光手段は前記液晶パネルと前記配
線基板にまたがるように配置されて補強機能を有するこ
とを特徴とする。
【0009】
【発明の実施の形態】図1は、本発明による投射型表示
装置に用いた液晶表示装置(液晶パネル)を説明するた
めに、参考図として示す液晶表示装置の主要断面図であ
る。対向電極基板2の液晶面側に遮光膜1があり、さら
に他方の基板3の外側に遮光膜4を形成してある。
【0010】アクティブマトリクス基板を使った液晶表
示装置を例にして製造方法を説明する。
【0011】アクティブ素子としては、薄膜トランジス
タや薄膜ダイオード等が有るが本発明においてアクティ
ブ素子の有無あるいは種類によってその効果がかわるこ
とはないので、薄膜トランジスタの例で説明する。薄膜
トランジスタを透明基板上にマトリクス状に配置形成
し、かつ信号線やタイミング線等の配線をしたいわゆる
アクティブマトリクス基板にポリイミド樹脂を塗布し、
綿布等により所定の方向にこすって液晶の配向処理を行
う。別の透明基板上に透明導電膜を形成し、さらに金属
膜を形成する。金属膜はCrやNi等の金属を蒸着法や
メッキ法により形成できる。この金属をフォトエッチン
グ法によって所定の形状になす。このとき少なくとも有
効表示領域の金属を除去し、有効表示領域の周辺は残す
ようにして遮光膜1となす。この様にして形成した基板
をアクティブマトリクス基板と同様に配向処理を行った
のち、一方の基板上に印刷等により液晶封入のためのシ
ール領域に樹脂膜パターン形成を行い、配向処理した2
枚の基板を所定の間隙を保持した状態で樹脂膜パターン
を固着させて液晶6を封入して液晶パネルとなす。
【0012】この液晶パネルのアクティブマトリクス基
板側に印刷により黒色の遮光膜4を周辺部に形成する。
ここでいう周辺部とは接続端子領域,シール領域及び非
駆動領域である。非駆動領域は遮光膜1で遮光されてい
るため遮光膜4で全ておおう必要はない。液晶パネル
は、プリント配線基板7と配線テープ8で接続されてお
り、配線テープ上に液晶駆動用のICを実装することが
多い。配線テープによる接続は強度的に弱いため樹脂に
より強化することが一般的であるが補強板9をつける場
合もある。補強板を遮光性のある金属等により構成する
と遮光範囲が広くなる。
【0013】図4は別の参考例を示す断面図で対向基板
42の液晶側に形成する遮光膜41は図1と異なりシー
ル領域には形成していない。シール材(樹脂膜パター
ン)と遮光膜との密着性が悪い場合やシール材が光硬化
型樹脂である場合などでシール領域に遮光膜を形成しな
いことがある。
【0014】上記の対向基板42とアクティブマトリク
ス基板3を前述と同様にしてパネル組立てを行い液晶パ
ネルとなす。
【0015】対向基板42の外側の面(液晶と反対側)
に遮光膜44を形成する。遮光膜44はあらかじめ蒸着
法やメッキ法で金属膜で形成してもよいし、パネル組立
後に印刷により黒色遮光膜形成してもよい。
【0016】以上の液晶パネルをプリント配線基板上に
実装する。図4の場合、プリント配線基板に段差をもう
けて液晶パネルを直接プリント配線基板上に保持固定し
ている。プリント配線基板も遮光効果をもたせるため、
遮光膜41及び44で構成した遮光領域と一部で重なる
ようにプリント配線基板43を構成している。プリント
配線基板はガラスエボキシ材のものが一般的で遮光性は
悪い、そのため図4では、プリント配線基板に遮光膜と
して黒色のインク材を塗布してある。
【0017】図5は本発明による液晶表示装置の主要断
面図を示す。図1の遮光膜4を形成しない点以外は全て
図1の例と同様にして液晶表示装置として、この液晶表
示装置に遮光板51をとりつける。遮光板51は前例の
遮光膜と同様に遮光膜1と一部で重なっており、光がも
れないようになっている。
【0018】遮光板51は、板厚を厚くして図1のよう
に補強板の効果を持たせることも可能である。また、そ
の場合は図5に示したようにパネルの有効表示領域側の
遮光板51の端面は傾斜をつけておくとさらによい。
【0019】
【発明の効果】以上説明したのように本発明によれば、
有効表示領域周辺での光を確実に遮光できる。
【0020】特に有効表示領域の近傍には遮光膜が形成
されるため、遮光することができる。また、遮光膜に加
えて、遮光手段は液晶パネルと配線基板にまたがるよう
に配置されているため、補強機能を有することができ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel and a projection display device using the liquid crystal panel as an optical shutter. 2. Description of the Related Art A conventional projection display device irradiates a liquid crystal display device 22 with light from a light source 21 as shown in FIG. The image is enlarged and projected by the lens 25. As shown in FIG. 3, a liquid crystal display device 22 is connected to a liquid crystal panel 31 with a wiring tape 32 on which a driving IC is mounted.
It is connected to the. The liquid crystal panel 31 has an effective display area 34
And non-drive area 35, seal area 36, connection terminal area 37
Divided into large. In a liquid crystal panel, polarizing plates are arranged on both sides of the liquid crystal panel in a TN (twisted nematic) system in order to secure the contrast ratio. [0005] However, the above-mentioned prior art has a problem that light from a light source is transmitted in an area other than the effective display area of the liquid crystal display device, and an unnecessary projected image is displayed. This is because the transmitted light from the connection terminal region 37, the non-driving region 35 when the polarization directions of the two polarizing plates are used crossing each other, and the polarization directions of the two polarizing plates are used in parallel. The light transmitted from the seal region 36 in this case is the cause. An object of the present invention is to solve such a problem, and an object of the present invention is to provide a projection display device which does not generate an unnecessary projection image. According to the present invention, a liquid crystal is sealed between a pair of substrates, and a light-shielding film disposed in a peripheral region of an effective display area on an inner surface side of the pair of substrates is provided. A liquid crystal device, comprising: a liquid crystal panel including a light shielding unit disposed in a peripheral area of the effective display area on an outer surface side of the pair of substrates; and a wiring board connected to the liquid crystal panel, The end on the effective display area side is located closer to the periphery than the end on the effective display area side of the light-shielding film, and the light-shielding means and the light-shielding film are arranged so as to overlap at least partially in plan view. The light shielding means is disposed so as to straddle the liquid crystal panel and the wiring board, and has a reinforcing function. The present invention provides a light source,
In a projection display device including a liquid crystal device that receives light from the light source and projection optical means that projects an image formed by the liquid crystal device, the liquid crystal device includes liquid crystal sealed between a pair of substrates. A liquid crystal panel comprising: a light-shielding film disposed in a peripheral area of the effective display area on the inner surface side of the pair of substrates; and a light-shielding unit disposed in a peripheral area of the effective display area on the outer surface side of the pair of substrates. And a wiring board connected to the liquid crystal panel, wherein the end of the light shielding means on the side of the effective display area is more peripheral than the end of the light shielding film on the side of the effective display area, and The light-shielding means and the light-shielding film are arranged so as to overlap at least partially in plan view, and the light-shielding means is arranged so as to straddle the liquid crystal panel and the wiring board and has a reinforcing function. I do. FIG. 1 is a main sectional view of a liquid crystal display device shown as a reference diagram for explaining a liquid crystal display device (liquid crystal panel) used in a projection type display device according to the present invention. . A light-shielding film 1 is provided on the liquid crystal surface side of the counter electrode substrate 2, and a light-shielding film 4 is formed outside the other substrate 3. A manufacturing method will be described by taking a liquid crystal display device using an active matrix substrate as an example. As the active element, there are a thin film transistor, a thin film diode, and the like. However, since the effect of the present invention does not change depending on the presence or absence or type of the active element, an example of the thin film transistor will be described. Thin-film transistors are arranged in a matrix on a transparent substrate, and a polyimide resin is applied to a so-called active matrix substrate on which wiring such as signal lines and timing lines has been applied.
The liquid crystal is aligned by rubbing in a predetermined direction with a cotton cloth or the like. A transparent conductive film is formed on another transparent substrate, and a metal film is further formed. The metal film can be formed of a metal such as Cr or Ni by a vapor deposition method or a plating method. This metal is formed into a predetermined shape by a photo etching method. At this time, at least the metal in the effective display area is removed, and the light-shielding film 1 is formed so as to leave the periphery of the effective display area. After the substrate thus formed was subjected to an alignment process in the same manner as the active matrix substrate, a resin film pattern was formed on a seal region for enclosing liquid crystal by printing or the like on one substrate, and the alignment process was performed.
The liquid crystal 6 is sealed by fixing the resin film pattern while holding a predetermined gap between the substrates, thereby forming a liquid crystal panel. On the active matrix substrate side of this liquid crystal panel, a black light-shielding film 4 is formed on the periphery by printing.
Here, the peripheral part is a connection terminal area, a seal area, and a non-drive area. Since the non-driving region is shielded from light by the light-shielding film 1, it is not necessary to cover the entire area with the light-shielding film 4. The liquid crystal panel is connected to the printed wiring board 7 by a wiring tape 8, and an IC for driving a liquid crystal is often mounted on the wiring tape. Since the connection by the wiring tape is weak in strength, it is generally strengthened by a resin, but a reinforcing plate 9 may be attached in some cases. When the reinforcing plate is made of a light-shielding metal or the like, the light-shielding range is widened. FIG. 4 is a cross-sectional view showing another reference example. Unlike FIG. 1, a light-shielding film 41 formed on the liquid crystal side of a counter substrate 42 is not formed in a seal region. When the adhesion between the sealing material (resin film pattern) and the light shielding film is poor, or when the sealing material is a photocurable resin, the light shielding film may not be formed in the sealing region. The opposing substrate 42 and the active matrix substrate 3 are assembled into a panel in the same manner as described above to form a liquid crystal panel. Outer surface of counter substrate 42 (opposite to liquid crystal)
Then, a light shielding film 44 is formed. The light-shielding film 44 may be formed in advance of a metal film by a vapor deposition method or a plating method, or a black light-shielding film may be formed by printing after assembling the panel. The above liquid crystal panel is mounted on a printed wiring board. In the case of FIG. 4, the liquid crystal panel is directly held and fixed on the printed wiring board with a step formed on the printed wiring board. Since the printed wiring board also has a light shielding effect,
The printed wiring board 43 is configured so as to partially overlap the light-shielding region formed by the light-shielding films 41 and 44. The printed wiring board is generally made of a glass epoxy material and has poor light-shielding properties. Therefore, in FIG. 4, a black ink material is applied as a light-shielding film to the printed wiring board. FIG. 5 is a main sectional view of a liquid crystal display device according to the present invention. Except that the light-shielding film 4 of FIG. 1 is not formed, a light-shielding plate 51 is attached to the liquid-crystal display in the same manner as in the example of FIG. The light-shielding plate 51 partially overlaps the light-shielding film 1 like the light-shielding film of the previous example, so that light does not leak. The light shielding plate 51 can be made thicker to have the effect of a reinforcing plate as shown in FIG. In this case, it is more preferable that the end face of the light shielding plate 51 on the effective display area side of the panel be inclined as shown in FIG. According to the present invention as described above,
Light around the effective display area can be reliably blocked. In particular, since a light-shielding film is formed near the effective display area, light can be shielded. Further, in addition to the light-shielding film, the light-shielding means is disposed so as to straddle the liquid crystal panel and the wiring board, so that it can have a reinforcing function.
【図面の簡単な説明】 【図1】遮光した液晶表示装置を示す主要断面図。 【図2】投射型表示装置の概要図。 【図3】液晶表示装置の平面図。 【図4】遮光した液晶表示装置を示す主要断面図。 【図5】遮光した液晶表示装置を示す主要断面図。 【符号の説明】 1,41・・・遮光膜 5・・・・・・シール 7・・・・・・プリント配線基板 6・・・・・・液晶 4,44・・・遮光膜 51・・・・・遮光板[Brief description of the drawings] FIG. 1 is a main cross-sectional view showing a light-shielded liquid crystal display device. FIG. 2 is a schematic view of a projection display device. FIG. 3 is a plan view of a liquid crystal display device. FIG. 4 is a main cross-sectional view showing a light-shielded liquid crystal display device. FIG. 5 is a main cross-sectional view showing a light-shielded liquid crystal display device. [Explanation of symbols] 1, 41 ... light shielding film 5 Seal 7 Printed wiring board 6 Liquid crystal 4,44 ... light shielding film 51 ... light shield plate
Claims (1)
基板の内面側の有効表示領域の周辺領域に配置された遮
光膜と前記一対の基板の外面側の前記有効表示領域の周
辺領域に配置された遮光手段とを具備する液晶パネル
と、前記液晶パネルに接続される配線基板とを有する液
晶装置であって、 前記遮光手段の前記有効表示領域側の端部は、前記遮光
膜の前記有効表示領域側の端部よりも周辺側であって前
記遮光手段と前記遮光膜とは平面的にみて少なくとも一
部で重なるように配置されてなり、前記遮光手段は前記
液晶パネルと前記配線基板にまたがるように配置されて
補強機能を有することを特徴とする液晶装置。 2.光源と、前記光源からの光を入射する液晶装置と、
前記液晶装置により形成された像を投射する投射光学手
段とを有する投射型表示装置において、 前記液晶装置は、一対の基板間に液晶が封入されてな
り、前記一対の基板の内面側の有効表示領域の周辺領域
に配置された遮光膜と前記一対の基板の外面側の前記有
効表示領域の周辺領域に配置された遮光手段とを具備す
る液晶パネルと、前記液晶パネルに接続される配線基板
とを有し、 前記遮光手段の前記有効表示領域側の端部は、前記遮光
膜の前記有効表示領域側の端部よりも周辺側であって前
記遮光手段と前記遮光膜とは平面的にみて少なくとも一
部で重なるように配置されてなり、前記遮光手段は前記
液晶パネルと前記配線基板にまたがるように配置されて
補強機能を有することを特徴とする投射型表示装置。(57) [Claims] Liquid crystal is sealed between the pair of substrates, and is disposed in a peripheral region of the effective display region on the inner surface side of the pair of substrates and in a peripheral region of the effective display region on the outer surface side of the pair of substrates. A liquid crystal panel comprising: a light-shielding means; and a wiring board connected to the liquid crystal panel, wherein an end of the light-shielding means on the side of the effective display area is the effective area of the light-shielding film. The light-shielding means and the light-shielding film are arranged so as to be at least partially overlapped with each other on a peripheral side from an end portion on the display area side when viewed in plan, and the light-shielding means is provided on the liquid crystal panel and the wiring substrate A liquid crystal device which is arranged so as to extend over and has a reinforcing function. 2. A light source, a liquid crystal device that receives light from the light source,
In a projection type display device having projection optical means for projecting an image formed by the liquid crystal device, the liquid crystal device includes liquid crystal sealed between a pair of substrates, and an effective display on an inner surface side of the pair of substrates. A liquid crystal panel including a light shielding film disposed in a peripheral region of the region and light shielding means disposed in a peripheral region of the effective display region on the outer surface side of the pair of substrates; and a wiring board connected to the liquid crystal panel. An end of the light shielding unit on the effective display area side is more peripheral than an end of the light shielding film on the effective display area side, and the light shielding unit and the light shielding film are viewed in plan. The projection type display device, wherein the projection type display device is arranged so as to at least partially overlap with each other, and the light shielding unit is arranged so as to straddle the liquid crystal panel and the wiring substrate and has a reinforcing function.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9294043A JP3030770B2 (en) | 1997-10-27 | 1997-10-27 | Liquid crystal device and projection type display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9294043A JP3030770B2 (en) | 1997-10-27 | 1997-10-27 | Liquid crystal device and projection type display device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8155246A Division JP2785808B2 (en) | 1996-06-17 | 1996-06-17 | Liquid crystal panel and projection display |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10197459A Division JP3143608B2 (en) | 1998-07-13 | 1998-07-13 | Projection display device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10104602A JPH10104602A (en) | 1998-04-24 |
JP3030770B2 true JP3030770B2 (en) | 2000-04-10 |
Family
ID=17802545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9294043A Expired - Lifetime JP3030770B2 (en) | 1997-10-27 | 1997-10-27 | Liquid crystal device and projection type display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3030770B2 (en) |
-
1997
- 1997-10-27 JP JP9294043A patent/JP3030770B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH10104602A (en) | 1998-04-24 |
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