JPH01159684A - Projection display - Google Patents
Projection displayInfo
- Publication number
- JPH01159684A JPH01159684A JP31923687A JP31923687A JPH01159684A JP H01159684 A JPH01159684 A JP H01159684A JP 31923687 A JP31923687 A JP 31923687A JP 31923687 A JP31923687 A JP 31923687A JP H01159684 A JPH01159684 A JP H01159684A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light valve
- crystal light
- liquid
- polarizing plate
- 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 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 13
- 239000002826 coolant Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 12
- 230000004907 flux Effects 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
- H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、投写型表示装置の冷却に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to cooling of a projection display device.
従来の投写型表示装置の冷却は、第２図に示すように、
空冷ファンによるものであった。As shown in Figure 2, cooling of a conventional projection display device is as follows.
It was caused by an air cooling fan.
しかし、前述の従来技術では、充分に冷却されず、液晶
ライトバルブが、高温度に、晒され、画質劣化に至ると
いう問題点を有する。そこで、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、液晶
ライトバルブが充分冷却され、経時的にも画質劣化が生
じず、信頼性の高い投写型表示装置を提供するところに
ある。However, the above-mentioned conventional technology has the problem that the liquid crystal light valve is not cooled sufficiently and is exposed to high temperatures, resulting in deterioration of image quality. SUMMARY OF THE INVENTION The present invention aims to solve these problems, and its purpose is to provide a highly reliable projection display device in which the liquid crystal light valve is sufficiently cooled and the image quality does not deteriorate over time. It is in a place where we provide.
本発明の投写型表示装置は、光源と液晶ライトバルブの
間に液体冷媒層を設け、液晶ライトバルブ及び光源側の
偏光板が、液体冷媒層により隔離され、液体冷媒は、自
然対流もしくは、液体ポンプにより環流し、ラジェター
で熱放出後、再循環することを特徴とする。In the projection display device of the present invention, a liquid refrigerant layer is provided between the light source and the liquid crystal light valve, the liquid crystal light valve and the polarizing plate on the light source side are separated by the liquid refrigerant layer, and the liquid refrigerant is heated by natural convection or liquid refrigerant. It is characterized by being refluxed by a pump, and after heat is released by a radiator, it is recirculated.
第１図は、本発明の実施例における主要断面図であって
、光？Ｉ！５より出射した光束は、液晶ライトバルブへ
入射する前に、液冷媒体及びその前の偏光板を通過する
とき、偏光板３及び液晶ライトバルブ２で吸収された光
は熱となり、ぞの熱は、液体冷媒１に伝達され、液体冷
媒１は液体ポンプ６で循環されているので、ラジェター
３を通過するときファン４により、放熱させ、冷却する
。液晶ライトバルブ２と前段偏光板３は液冷媒体１を介
して離れており、偏光板３の発熱が液晶ライトバルブ２
に直接伝わらない。FIG. 1 is a main cross-sectional view of an embodiment of the present invention, and shows light? I! When the light flux emitted from 5 passes through the liquid cooling medium and the polarizing plate in front of it before entering the liquid crystal light valve, the light absorbed by the polarizing plate 3 and the liquid crystal light valve 2 becomes heat, and the heat is is transmitted to the liquid refrigerant 1, and since the liquid refrigerant 1 is circulated by the liquid pump 6, when it passes through the radiator 3, it is radiated and cooled by the fan 4. The liquid crystal light valve 2 and the front polarizing plate 3 are separated via the liquid cooling medium 1, and the heat generated by the polarizing plate 3 is transferred to the liquid crystal light valve 2.
It is not directly transmitted to
液晶ライトバルブ２を通過し強度変調された光はレンズ
７を通過しスクリーン８へ投映結像され′表示される。The intensity-modulated light that passes through the liquid crystal light valve 2 passes through a lens 7 and is projected onto a screen 8 for display.
液体は空気に比して比熱が太き（、熱伝達力が高く、少
鼠の流量で有効に冷却することができるため、その冷却
能力は格段に向上する。Liquid has a higher specific heat (and higher heat transfer power) than air, and can be effectively cooled with a small flow rate, so its cooling capacity is greatly improved.
ここに利用する液体冷媒は、光束が充分に透過すること
が要求されるので、エチレングリコール等を使用する。The liquid refrigerant used here is required to sufficiently transmit the luminous flux, so ethylene glycol or the like is used.
又光源側の偏光板は、光源の光を円偏光から直線偏光に
し、光強度の略半分を吸収し、熱に変えるので温度上昇
し自ら高温になるので、充分な冷却が要求される。さら
には液晶は、高温になると画質劣化やはなはだしい場合
は、画像表示不能状態となるので、この両者を強制的に
冷却することは、画質向上、長寿命化には、非常にを効
であり、かつ必然的要求事項であるので、この部分を充
分な流量をもって液体により冷却することは非常に有効
な効果をもたらす。また、液体はあたためられると比重
が軽くなり対流を生じるため、流路の抵抗を小さくし、
冷却部のラジェターの容量を大きくすることにより、自
然対流によっても、冷却する系を構成することは可能で
ある。さらに、ラジェタ一部の放熱系も、空気の自然対
流によりファンを用いない系とすることも可能である。In addition, the polarizing plate on the light source side changes the light from the light source from circularly polarized light to linearly polarized light, absorbs approximately half of the light intensity, and converts it into heat, so the temperature rises and becomes high in itself, so sufficient cooling is required. Furthermore, when liquid crystals reach high temperatures, the image quality deteriorates, or in extreme cases, they become unable to display images, so forcibly cooling both of them is extremely effective in improving image quality and extending the lifespan. Since this is a necessary requirement, cooling this portion with liquid at a sufficient flow rate brings about a very effective effect. In addition, when a liquid is heated, its specific gravity becomes lighter and convection occurs, which reduces the resistance of the flow path.
By increasing the capacity of the radiator in the cooling section, it is possible to configure a cooling system using natural convection. Furthermore, the heat dissipation system for a part of the radiator may also be a system that does not use a fan due to natural convection of air.
以上述べたように、発明によれば、光源と液晶ライトバ
ルブの間に液体冷媒層を設け、積極的に冷却することが
できることにより、液晶ライトバルブの劣化や高温動作
不良を防止することができ商い信顛性、長寿命の投写型
表示装置を提供することができるという効果を有する。As described above, according to the invention, by providing a liquid coolant layer between the light source and the liquid crystal light valve and actively cooling it, it is possible to prevent the liquid crystal light valve from deteriorating or malfunctioning at high temperatures. This has the effect of providing a projection type display device with commercial reliability and long life.
さらには、偏光板と液晶の間に空気層がなくなるため、
屈折率変化の大きな界面がなくなることから、反射戻り
光が低減し、余分赴敗乱が少なくなることにより明るさ
が減少することなく、散乱によるコントラスト低下が減
少し、画質のすぐれた投写型表示装置を提供することが
できるという効果も有する。Furthermore, since there is no air layer between the polarizing plate and the liquid crystal,
Since there are no interfaces with large refractive index changes, reflected return light is reduced, redundant disturbances are reduced, brightness is not reduced, and contrast reduction due to scattering is reduced, resulting in a projection display with excellent image quality. It also has the effect of being able to provide a device.
第１図は、本発明の投写型表示装置の一実施例を示す主
要断面図。
第２図は、従来の投写型表示装置を示す主要断面図。
１・・・液体冷媒
２．２３・・・液晶ライトバルブ
３・・・偏光板
４．２４・・・ファン
５．２５・・・光源
６・・・液体ポンプ
７．２７・・・レンズ
８．２８・・・スクリーン
以 上
出願人 セイコーエプソン株式会社FIG. 1 is a main sectional view showing an embodiment of a projection type display device of the present invention. FIG. 2 is a main sectional view showing a conventional projection display device. 1...Liquid refrigerant 2.23...Liquid crystal light valve 3...Polarizing plate 4.24...Fan 5.25...Light source 6...Liquid pump 7.27...Lens 8. 28...Screen or above Applicant: Seiko Epson Corporation
Claims (1)
ズで拡大投映する投写型表示装置において、光源と液晶
ライトバルブの間に液体冷媒層を設け液晶ライトバルブ
及び光源側の偏光板が液体冷媒層により隔離され、液体
冷媒は自然対流もしくは液体ポンプにより環流し、ラジ
エターで熱放出後、再循環することを特徴とする投写型
表示装置。In a projection display device that modulates the light intensity of light emitted from a light source using a liquid crystal light valve and magnifies and projects the light using a lens, a liquid coolant layer is provided between the light source and the liquid crystal light valve, and the liquid crystal light valve and the polarizing plate on the light source side are made of liquid coolant. A projection type display device that is separated by a layer, the liquid refrigerant is circulated by natural convection or a liquid pump, and is recirculated after releasing heat in a radiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31923687A JPH01159684A (en) | 1987-12-17 | 1987-12-17 | Projection display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31923687A JPH01159684A (en) | 1987-12-17 | 1987-12-17 | Projection display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01159684A true JPH01159684A (en) | 1989-06-22 |
Family
ID=18107929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31923687A Pending JPH01159684A (en) | 1987-12-17 | 1987-12-17 | Projection display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01159684A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005088355A1 (en) * | 2004-03-12 | 2005-09-22 | Matsushita Electric Industrial Co., Ltd. | Light-absorbing member |
| EP1581011A1 (en) * | 2004-03-26 | 2005-09-28 | Seiko Epson Corporation | Optical modulator holder, optical device, and projector |
| US7085034B2 (en) | 2004-03-23 | 2006-08-01 | Seiko Epson Corporation | Optical device and projector |
| US7172291B2 (en) | 2004-04-02 | 2007-02-06 | Seiko Epson Corporation | Electronic apparatus and cooling medium replacement cartridge |
| US7192143B2 (en) | 2004-02-10 | 2007-03-20 | Seiko Epson Corporation | Optical device and projector |
| US7213925B2 (en) | 2004-02-16 | 2007-05-08 | Seiko Epson Corporation | Optical modulator, optical device and projector |
| US7216988B2 (en) | 2004-03-30 | 2007-05-15 | Seiko Epson Corporation | Optical device and projector |
| US7270418B2 (en) | 2003-12-26 | 2007-09-18 | Seiko Epson Corporation | Optical device and projector |
| US7513625B2 (en) | 2005-03-01 | 2009-04-07 | Seiko Epson Corporation | Optical device and projector |
| US7585077B2 (en) | 2005-03-01 | 2009-09-08 | Seiko Epson Corporation | Optical apparatus and projector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62294230A (en) * | 1986-06-13 | 1987-12-21 | Tokyo Electric Co Ltd | Projector |
-
1987
- 1987-12-17 JP JP31923687A patent/JPH01159684A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62294230A (en) * | 1986-06-13 | 1987-12-21 | Tokyo Electric Co Ltd | Projector |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7270418B2 (en) | 2003-12-26 | 2007-09-18 | Seiko Epson Corporation | Optical device and projector |
| US7192143B2 (en) | 2004-02-10 | 2007-03-20 | Seiko Epson Corporation | Optical device and projector |
| US7213925B2 (en) | 2004-02-16 | 2007-05-08 | Seiko Epson Corporation | Optical modulator, optical device and projector |
| WO2005088355A1 (en) * | 2004-03-12 | 2005-09-22 | Matsushita Electric Industrial Co., Ltd. | Light-absorbing member |
| US7085034B2 (en) | 2004-03-23 | 2006-08-01 | Seiko Epson Corporation | Optical device and projector |
| EP1581011A1 (en) * | 2004-03-26 | 2005-09-28 | Seiko Epson Corporation | Optical modulator holder, optical device, and projector |
| US7150543B2 (en) | 2004-03-26 | 2006-12-19 | Seiko Epson Corporation | Optical modulator holder, optical device, and projector |
| US7216988B2 (en) | 2004-03-30 | 2007-05-15 | Seiko Epson Corporation | Optical device and projector |
| US7172291B2 (en) | 2004-04-02 | 2007-02-06 | Seiko Epson Corporation | Electronic apparatus and cooling medium replacement cartridge |
| US7513625B2 (en) | 2005-03-01 | 2009-04-07 | Seiko Epson Corporation | Optical device and projector |
| US7585077B2 (en) | 2005-03-01 | 2009-09-08 | Seiko Epson Corporation | Optical apparatus and projector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7556383B2 (en) | Projection display apparatus using liquid cooling and air cooling | |
| US7967446B2 (en) | Liquid crystal projector apparatus and cooler | |
| US5032021A (en) | Liquid crystal projector | |
| WO2015141213A1 (en) | Cooling device and projector | |
| US20060203206A1 (en) | Cooling apparatus and a projector having the same | |
| KR20040028666A (en) | Liquid crystal projector | |
| JPH01159684A (en) | Projection display | |
| US20170075201A1 (en) | Light source apparatus and image display apparatus | |
| JP4811190B2 (en) | LCD display | |
| US9152024B2 (en) | Video display device and cooling system | |
| CN212540990U (en) | Full-sealed optical machine of high-brightness single-chip liquid crystal projector | |
| JPH05264947A (en) | Cooling device of projecting device | |
| JP2004245914A (en) | Liquid crystal projector device and transparent plate used for same, and liquid crystal display panel | |
| JP2018046036A (en) | Cooling device | |
| JP2016200657A (en) | projector | |
| JPH03174134A (en) | Display device for liquid crystal projector | |
| JP3049752B2 (en) | Projection display device | |
| WO2021157452A1 (en) | Light source device and projection-type video display device | |
| CN111856855B (en) | Optical machine module and projector | |
| JP2004246178A (en) | Optical unit, projection type video display device and polarizing plate used therein | |
| JPH1138409A (en) | Reflection liquid crystal display device | |
| JPH0431847A (en) | Liquid crystal projector | |
| WO2022038943A1 (en) | Cooling device and projection-type image display device provided with same | |
| JP2003195253A (en) | Optical device and projector provided with the same | |
| JP2008217041A (en) | Projection-type display device and method for cooling liquid crystal unit |