JPH1020400A - Liquid crystal projector - Google Patents
Liquid crystal projectorInfo
- Publication number
- JPH1020400A JPH1020400A JP8179364A JP17936496A JPH1020400A JP H1020400 A JPH1020400 A JP H1020400A JP 8179364 A JP8179364 A JP 8179364A JP 17936496 A JP17936496 A JP 17936496A JP H1020400 A JPH1020400 A JP H1020400A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- film
- crystal panel
- polarizing plate
- panel
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/72—Modifying the appearance of television pictures by optical filters or diffusing screens
Landscapes
- Liquid Crystal (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶プロジェクタ
に関し、特にスクリーン上での照度むら低減構造に関す
る。[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal projector, and more particularly to a structure for reducing illuminance unevenness on a screen.
【０００２】[0002]
【従来の技術】従来の液晶プロジェクタの冷却方式は、
冷却ファンを用いて、冷却風を液晶パネルに当てて冷却
を行なっている。2. Description of the Related Art The conventional cooling method of a liquid crystal projector is as follows.
The cooling air is applied to the liquid crystal panel using a cooling fan to perform cooling.
【０００３】[0003]
【発明が解決しようとする課題】第１の問題点は、従来
の技術においてスクリーン上で照度むらが発生すること
である。その理由は、冷却風の風量ゆらぎで液晶パネル
表面の温度ゆらぎが生じると、液晶パネルの透過率が温
度ゆらぎに応じて変化し、それがスクリーン上で照度む
らを発生させるからである。A first problem is that uneven illuminance occurs on a screen in the prior art. The reason is that, when the temperature fluctuation of the liquid crystal panel surface occurs due to the fluctuation of the amount of cooling air, the transmittance of the liquid crystal panel changes according to the temperature fluctuation, which causes uneven illuminance on the screen.
【０００４】本発明は、スクリーン上での照度むらの発
生を抑えることを目的とする。An object of the present invention is to suppress the occurrence of uneven illuminance on a screen.
【０００５】[0005]
【課題を解決するための手段】本発明の液晶プロジェク
タは、光源ランプと第１の偏光板を有する照明光学系
と、第２の偏光板を有する液晶パネルと投写光学系と、
液晶パネルを冷却するファンから構成される液晶プロジ
ェクタにおいて、液晶パネルの冷却風の当る面に温度を
平均化する膜を形成している。この膜の性質としては偏
光を乱さないような透明材料であり、例えば光学的等方
性フィルムが適している。A liquid crystal projector according to the present invention comprises: an illumination optical system having a light source lamp and a first polarizing plate; a liquid crystal panel having a second polarizing plate; and a projection optical system.
2. Description of the Related Art In a liquid crystal projector including a fan for cooling a liquid crystal panel, a film for averaging the temperature is formed on a surface of the liquid crystal panel where cooling air is applied. This film is a transparent material that does not disturb the polarization, and for example, an optically isotropic film is suitable.
【０００６】液晶パネルの送風側表面にそのようなフィ
ルムを貼り付けると、たとえフィルム表面に冷却風のゆ
らぎによる温度ゆらぎが生じてもフィルムを通して液晶
パネル表面に達するまでに熱が拡散してしまうのでゆら
ぎは低減する。If such a film is adhered to the surface of the air blow side of the liquid crystal panel, even if the temperature fluctuates due to the fluctuation of the cooling air on the film surface, heat is diffused before reaching the liquid crystal panel surface through the film. Fluctuations are reduced.
【０００７】また、そのような熱拡散フィルムとして位
相差フィルムを用いるとき、偏光軸と位相軸が平行また
は垂直にすれば偏光を乱すことはなく、光学的等方性フ
ィルムとして用いることができる。Further, when a retardation film is used as such a heat diffusion film, if the polarization axis and the phase axis are parallel or perpendicular, the polarization is not disturbed and the film can be used as an optically isotropic film.
【０００８】[0008]
【発明の実施の形態】次に本発明の実施の形態について
図面を参照して詳細に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【０００９】図１を参照すると、本発明の第１の実施例
は、リフレクタ１を持つ光源ランプ２と第１の偏光板５
１を有する照明光学系と、第２の偏光板５２を有する液
晶パネル７と投写光学系と液晶パネル７と冷却ファン１
１から構成される液晶プロジェクタにおいて、液晶パネ
ル７の入射光側表面、すなわち通風側表面に光学的等方
性を有する熱拡散フィルム６が貼り付けられている。Referring to FIG. 1, a first embodiment of the present invention is a light source lamp 2 having a reflector 1 and a first polarizer 5.
1, a liquid crystal panel 7 having a second polarizing plate 52, a projection optical system, a liquid crystal panel 7, and a cooling fan 1.
In the liquid crystal projector composed of 1, a heat diffusion film 6 having optical isotropy is attached to the incident light side surface of the liquid crystal panel 7, that is, the ventilation side surface.
【００１０】ランプ２から発生した光９は、まずレンズ
３１で方向を変え、平行光となる。次に平行光はガラス
４で支持された偏光板５１に入射し、偏光された光が熱
拡散フィルム６（例えば位相差フィルム）を通して液晶
パネル７に入射する。液晶パネル７にて画像変調された
光は２枚目の偏光板５２を透過したあと数枚のレンズ３
２によってスクリーン８上に投写される。熱拡散フィル
ム６が付いた液晶パネル７にはファン１１が付いてお
り、このファン１１で発生した冷却風１０を熱拡散フィ
ルム６に当てて、液晶パネル７を間接的に冷却する。こ
の冷却風１０は一般には風量がゆらいでおり、このため
熱拡散フィルム６の表面は局所的に温度が高い部分が残
存する。図２は、それを示したものである。図２を参照
して説明すると、熱拡散フィルムの表面の局所的に温度
が高い部分１３の熱はそのフィルム６の内部を熱拡散し
ながら伝わり（図２ではハッチングしている部分）、液
晶パネル７の表面に達する。したがって液晶パネル７の
表面の温度はフィルム６の表面の温度ゆらぎより軽減で
きる。The light 9 generated from the lamp 2 is first changed in direction by a lens 31 and becomes parallel light. Next, the parallel light enters the polarizing plate 51 supported by the glass 4, and the polarized light enters the liquid crystal panel 7 through the heat diffusion film 6 (for example, a retardation film). The light image-modulated by the liquid crystal panel 7 is transmitted through the second polarizing plate 52, and then a few lenses 3
2 is projected on a screen 8. The liquid crystal panel 7 with the heat diffusion film 6 is provided with a fan 11, and the cooling air 10 generated by the fan 11 is applied to the heat diffusion film 6 to indirectly cool the liquid crystal panel 7. Generally, the amount of the cooling air 10 fluctuates, so that a portion of the surface of the heat diffusion film 6 where the temperature is locally high remains. FIG. 2 illustrates this. Referring to FIG. 2, the heat of the locally high temperature portion 13 on the surface of the heat diffusion film is transmitted while diffusing inside the film 6 (hatched portion in FIG. 2), and the liquid crystal panel 7 is reached. Therefore, the temperature on the surface of the liquid crystal panel 7 can be reduced more than the temperature fluctuation on the surface of the film 6.
【００１１】熱拡散フィルム６の具体例としてはＴＡＣ
（三酢酸セルロース）フィルムがある。このＴＡＣフィ
ルムとしては材料の入手性などから８０μｍから１６０
μｍの厚さが適当である。A specific example of the heat diffusion film 6 is TAC
(Cellulose triacetate) film. As the TAC film, from 80 μm to 160
A thickness of μm is appropriate.
【００１２】本実施例においても、冷却風１０がゆらい
で熱拡散フィルム表面の温度ゆらぎが生じても、液晶パ
ネル７表面は熱拡散フィルムによって温度ゆらぎが軽減
する。Also in the present embodiment, even if the cooling air 10 fluctuates and the temperature fluctuation on the surface of the heat diffusion film occurs, the temperature fluctuation on the surface of the liquid crystal panel 7 is reduced by the heat diffusion film.
【００１３】[0013]
【発明の効果】第１の効果は、液晶パネル表面の温度ゆ
らぎが軽減することである。これにより、スクリーン上
での照度むらを抑えることができる。その理由は、冷却
風のゆらぎで光学的に熱拡散フィルム表面の温度ゆらぎ
が生じても液晶パネル表面はフィルム内で熱が拡散する
ことによって温度ゆらぎが軽減するからでる。The first effect is that the temperature fluctuation on the liquid crystal panel surface is reduced. This makes it possible to suppress illuminance unevenness on the screen. The reason is that even if the temperature of the heat diffusion film surface optically fluctuates due to the fluctuation of the cooling air, the temperature fluctuation is reduced by the heat diffusion in the film on the liquid crystal panel surface.
【図１】本発明の液晶プロジェクタの実施形態を示す概
略構成図である。FIG. 1 is a schematic configuration diagram showing an embodiment of a liquid crystal projector of the present invention.
【図２】本発明の液晶パネル部の熱拡散を説明するため
の断面図である。FIG. 2 is a cross-sectional view illustrating heat diffusion of a liquid crystal panel according to the present invention.
１ リフレクタ ２ ランプ ３１，３２ レンズ ４ ガラス ５１，５２ 偏光板 ６ 熱拡散フィルム ７ 液晶パネル ８ スクリーン ９ 光 １０ 冷却風 １１ ファン １２ ＴＡＣフィルム １３ 風量ゆらぎで局所的に温度が高くなった部分 DESCRIPTION OF SYMBOLS 1 Reflector 2 Lamp 31 and 32 Lens 4 Glass 51 and 52 Polarizing plate 6 Thermal diffusion film 7 Liquid crystal panel 8 Screen 9 Light 10 Cooling air 11 Fan 12 TAC film 13 Part where temperature became high locally due to fluctuation of air volume
Claims (4)
光学系と、第２の偏光板を有する液晶パネルと投写光学
系と、前記液晶パネルを冷却するファンから構成される
液晶プロジェクタにおいて、前記液晶パネルの通風側表
面に光学的等方性を有する熱拡散フィルムを設けたこと
を特徴とする液晶プロジェクタ。1. A liquid crystal projector comprising a light source lamp, an illumination optical system having a first polarizing plate, a liquid crystal panel having a second polarizing plate, a projection optical system, and a fan for cooling the liquid crystal panel. A liquid crystal projector, wherein a heat diffusion film having optical isotropy is provided on a ventilation side surface of the liquid crystal panel.
イルロース）フィルムであることを特徴とする請求項１
記載の液晶プロジェクタ。2. The heat diffusion film is a TAC (sailulose triacetate) film.
The liquid crystal projector as described.
０μｍであることを特徴とする請求項２記載の液晶プロ
ジェクタ。3. The heat diffusion film has a thickness of 80 to 16
3. The liquid crystal projector according to claim 2, wherein the thickness is 0 [mu] m.
あることを特徴とする請求項１記載の液晶プロジェク
タ。4. The liquid crystal projector according to claim 1, wherein said heat diffusion film is a retardation film.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8179364A JP2885191B2 (en) | 1996-07-09 | 1996-07-09 | LCD projector |
| KR1019970031740A KR980013352A (en) | 1996-07-09 | 1997-07-09 | LIQUID CRYSTAL IMAGE with an optically isotropic thermal radiation plate that eliminates illumination non-uniformity from the image generated on the screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8179364A JP2885191B2 (en) | 1996-07-09 | 1996-07-09 | LCD projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1020400A true JPH1020400A (en) | 1998-01-23 |
| JP2885191B2 JP2885191B2 (en) | 1999-04-19 |
Family
ID=16064568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8179364A Expired - Lifetime JP2885191B2 (en) | 1996-07-09 | 1996-07-09 | LCD projector |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2885191B2 (en) |
| KR (1) | KR980013352A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002018857A3 (en) * | 2000-08-30 | 2002-05-16 | Lg Electronics Inc | Cooling system for projector |
| US7781577B2 (en) | 2006-09-29 | 2010-08-24 | Lexicon Pharmaceuticals, Inc. | Inhibitors of sodium glucose co-transporter 2 and methods of their use |
| US7846945B2 (en) | 2007-03-08 | 2010-12-07 | Lexicon Pharmaceuticals, Inc. | Piperdine-based inhibitors of sodium glucose co-transporter 2 and methods of their use |
-
1996
- 1996-07-09 JP JP8179364A patent/JP2885191B2/en not_active Expired - Lifetime
-
1997
- 1997-07-09 KR KR1019970031740A patent/KR980013352A/en active IP Right Grant
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002018857A3 (en) * | 2000-08-30 | 2002-05-16 | Lg Electronics Inc | Cooling system for projector |
| US6871960B2 (en) | 2000-08-30 | 2005-03-29 | Lg Electronics Inc. | Cooling system for projector |
| US7781577B2 (en) | 2006-09-29 | 2010-08-24 | Lexicon Pharmaceuticals, Inc. | Inhibitors of sodium glucose co-transporter 2 and methods of their use |
| US7846945B2 (en) | 2007-03-08 | 2010-12-07 | Lexicon Pharmaceuticals, Inc. | Piperdine-based inhibitors of sodium glucose co-transporter 2 and methods of their use |
Also Published As
| Publication number | Publication date |
|---|---|
| KR980013352A (en) | 1998-04-30 |
| JP2885191B2 (en) | 1999-04-19 |
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