JP2906601B2 - Projection display device - Google Patents
Projection display deviceInfo
- Publication number
- JP2906601B2 JP2906601B2 JP2175058A JP17505890A JP2906601B2 JP 2906601 B2 JP2906601 B2 JP 2906601B2 JP 2175058 A JP2175058 A JP 2175058A JP 17505890 A JP17505890 A JP 17505890A JP 2906601 B2 JP2906601 B2 JP 2906601B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- crystal panel
- green
- incident
- 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
Landscapes
- Projection Apparatus (AREA)
- Liquid Crystal (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は投射型表示装置に関する。Description: TECHNICAL FIELD The present invention relates to a projection display device.
従来の光学系は、赤色、緑色、青色用の液晶パネルと
して、駆動電圧ONのとき光を透過し、OFFのとき光を遮
断する液晶パネルと、それに対応する偏光板とを３枚有
していた。Conventional optical systems have three liquid crystal panels for red, green, and blue that transmit light when the drive voltage is ON and block light when the drive voltage is OFF, and corresponding polarizing plates. Was.
しかしながら従来の光学系において、ダイクロイック
ミラーにより分解された三源色は、上記液晶パネルに入
射する偏光方向をそれぞれ赤色−Ｓ偏光（入射直線偏光
の振動面が入射面と垂直な偏光）、緑色−Ｐ偏光（入射
直線偏光の振動面が入射面と平行な偏光）、青色−Ｓ偏
光とに分けていた。ここで緑色光について考えると、緑
色光の分解をする緑色用ダイクロイックミラーには、Ｓ
偏光−Ｐ偏光分離特性がある。この特性により緑色光の
反射成分はＰ偏光成分とＳ偏光成分とで反射波長域が異
なり、Ｐ偏光成分がＳ偏光成分に比べて光量がダウンす
る。従ってＰ偏光で入射する緑色光の光量がダウンする
という課題を有する。又赤色についても同様に考えるこ
とができる。そこで本発明は、このような課題を解決す
るもので、その目的とするところは光の入射成分のＰ偏
光−Ｓ偏光による液晶パネルの入射側偏光板での吸収ロ
スをなくし、光量アップする投射型表示装置を提供する
ものである。However, in the conventional optical system, the three primary colors separated by the dichroic mirror change the polarization directions incident on the liquid crystal panel into red-S polarized light (polarized light whose vibration plane of incident linearly polarized light is perpendicular to the incident plane) and green light, respectively. It was divided into P-polarized light (polarized light whose vibration plane of incident linearly polarized light was parallel to the incident plane) and blue-S polarized light. Here, considering green light, a dichroic mirror for green that decomposes green light has S
There is a polarization-P polarization separation characteristic. Due to this characteristic, the reflection component of the green light has a different reflection wavelength range between the P-polarized component and the S-polarized component, and the light quantity of the P-polarized component is lower than that of the S-polarized component. Therefore, there is a problem that the amount of green light incident as P-polarized light is reduced. The same applies to red. Therefore, the present invention solves such a problem, and an object of the present invention is to eliminate the absorption loss of the incident component of light by the P-polarized light and the S-polarized light on the incident-side polarizing plate of the liquid crystal panel, thereby increasing the amount of light. The present invention provides a type display device.
本発明は、複数色の色光をそれぞれ変調する複数のラ
イトバルブと、前記複数の透過型液晶パネルによって変
調された色光を合成する色光合成手段と、前記色光合成
手段によって合成された色光を投射する投射手段とを備
えた投射型表示装置であって、前記複数のライトバルブ
のうち一部は、ON電圧で駆動されるときに光を透過する
第１の透過型液晶パネルと、前記第１の透過型液晶パネ
ルの光入出射面側に配置された一対の偏光板とからな
り、前記複数のライトバルブのうち残りは、OFF電圧で
駆動されるときに光を透過する第２の透過型液晶パネル
と、前記第２の透過型液晶パネルの光入出射面側に配置
された一対の偏光板とからなることを特徴とする。The present invention projects a plurality of light valves respectively modulating a plurality of color lights, a color light combining means for combining the color lights modulated by the plurality of transmissive liquid crystal panels, and a color light combined by the color light combining means. A projection type display device comprising: a first transmission type liquid crystal panel that transmits light when driven by an ON voltage, wherein the first transmission type liquid crystal panel includes: a first transmission type liquid crystal panel; A second transmissive liquid crystal, comprising a pair of polarizers disposed on the light incident / exit surface side of the transmissive liquid crystal panel, wherein the other of the plurality of light valves transmits light when driven by an OFF voltage. The panel is characterized by comprising a pair of polarizing plates arranged on the light incident / exit surface side of the second transmission type liquid crystal panel.
第１図は本発明の実施例における光学系配置図であっ
て、光源１より発した光束は、青反射ダイクロイックミ
ラー３、緑反射ダイクロイックミラー４により、赤色、
緑色、青色の三源色に分解される。分解された光はそれ
ぞれ赤色用入射側偏光板５によりＳ偏光に、緑色用入射
側偏光板６によりＳ偏光に、青色用入射側偏光板７によ
りＳ偏光に直線偏光され、駆動電圧ONのとき光を透過す
る赤色用液晶パネル８及び青色用液晶パネル10と、駆動
電圧OFFのとき光を透過する緑色用液晶パネル９に入光
する。それぞれの液晶パネルを透過した光は、出射側偏
光板11,12,13により透過あるいは吸収され、キューブプ
リズム14により合成され投射レンズ15によりスクリーン
等に投射映像化される。FIG. 1 is a diagram showing an arrangement of an optical system according to an embodiment of the present invention. A light beam emitted from a light source 1 is reflected by a blue reflection dichroic mirror 3 and a green reflection dichroic mirror 4 to be red,
Decomposed into three primary colors, green and blue. The decomposed light is linearly polarized into S-polarized light by the incident-side polarizing plate 5 for red, S-polarized by the incident-side polarizing plate 6 for green, and S-polarized by the incident-side polarizing plate 7 for blue when the driving voltage is ON. Light enters the red liquid crystal panel 8 and the blue liquid crystal panel 10 that transmit light, and the green liquid crystal panel 9 that transmits light when the driving voltage is OFF. The light transmitted through each liquid crystal panel is transmitted or absorbed by the output-side polarizing plates 11, 12, and 13, synthesized by the cube prism 14, and projected and imaged on a screen or the like by the projection lens 15.
第２図は、本発明における駆動電圧ONのとき光を透過
する液晶パネルと駆動電圧OFFのとき光を透過する液晶
パネルの模式的な動作図である。FIG. 2 is a schematic operation diagram of a liquid crystal panel that transmits light when the driving voltage is ON and a liquid crystal panel that transmits light when the driving voltage is OFF according to the present invention.
第２図（ａ），（ｂ）は駆動電圧ONのとき光を透過し
〔第２図−（ａ）〕、駆動電圧OFFのとき光を透過しな
い〔第２図（ｂ）〕液晶パネルの模式的な動作図を示
す。FIGS. 2 (a) and 2 (b) show that light is transmitted when the driving voltage is ON [FIG. 2 (a)] and light is not transmitted when the driving voltage is OFF [FIG. 2 (b)]. The schematic operation | movement figure is shown.
第２図（ｃ），（ｄ）は駆動電圧OFFのとき光を透過
し〔第２図（ｃ）〕、駆動電圧ONのとき光を透過しない
〔第２図（ｄ）〕液晶パネルの模式的な動作図を示す。FIGS. 2 (c) and 2 (d) show light transmitting when the driving voltage is OFF [FIG. 2 (c)] and do not transmit light when the driving voltage is ON [FIG. 2 (d)]. FIG.
本発明は、光学系の中に、上記２種類の液晶パネルを
組合わせて用いる。The present invention uses the above two types of liquid crystal panels in combination in an optical system.
第３図は、投射型表示装置に用いられる緑反射ダイク
ロイックミラーのＰ偏光−Ｓ偏光分離特性である。Ｐ偏
光に比べＳ偏光が10nm長波長側にズレている。従来の光
学系は駆動電圧ONのとき光を透過する緑色用液晶パネル
を有し、入射側偏光板はＰ偏光で配置されていた。従っ
てＳ偏光の反射光はこの偏光板に吸収されていた。しか
し本発明の駆動電圧ONのとき光を透過する緑色用液晶パ
ネルの入射側偏光板をＳ偏光で配置したことにより、反
射波長域の広いＳ偏光を使用できる。以上緑反射ダイク
ロイックミラーで反射された緑色光を有効に透過型液晶
パネルに入射させることができ、これによる緑色光の明
るさは20％程アップする。FIG. 3 shows the P-polarized light-S-polarized light separation characteristics of the green reflection dichroic mirror used in the projection display device. The S-polarized light is shifted to the longer wavelength side by 10 nm than the P-polarized light. The conventional optical system has a green liquid crystal panel that transmits light when the driving voltage is ON, and the incident side polarizing plate is arranged with P-polarized light. Therefore, the S-polarized light was absorbed by this polarizing plate. However, by arranging the incident-side polarizing plate of the green liquid crystal panel that transmits light when the driving voltage is ON according to the present invention with S-polarized light, S-polarized light having a wide reflection wavelength range can be used. As described above, the green light reflected by the green reflection dichroic mirror can be effectively made incident on the transmissive liquid crystal panel, thereby increasing the brightness of the green light by about 20%.
第４図は、本発明の簡単な駆動回路図である。緑色用
の液晶パネルの駆動は、第４図（ａ）の赤色、青色用の
駆動回路に第４図（ｂ）の反転回路を付加すればよい。FIG. 4 is a simple drive circuit diagram of the present invention. The driving of the liquid crystal panel for green may be achieved by adding the inverting circuit of FIG. 4 (b) to the driving circuit for red and blue of FIG. 4 (a).
以上述べたように本発明によれば、駆動電圧ONのとき
光を透過する液晶パネルと、駆動電圧OFFのとき光を透
過する液晶パネルとを組合せて配置することにより、光
源から出射された光を有効かつ最大限に利用することが
でき、明るい映像を提供するという効果を有する。As described above, according to the present invention, by arranging a liquid crystal panel that transmits light when the driving voltage is ON and a liquid crystal panel that transmits light when the driving voltage is OFF, the light emitted from the light source is arranged. Can be used effectively and to the maximum, and has the effect of providing a bright image.
第１図は本発明の光学系配置図。 第２図は本発明の液晶パネルの模式的な動作図。 第３図は緑反射ダイクロイックミラーのＰ偏光−Ｓ偏光
分離特性図。 第４図は本発明の駆動回路図を示す。 １…光源 ２…熱線反射フィルター ３…青反射ダイクロイックミラー ４…緑反射ダイクロイックミラー ５…赤色用入射側偏光板 ６…緑色用入射側偏光板 ７…青色用入射側偏光板 ８…赤色用液晶パネル ９…緑色用液晶パネル 10…青色用液晶パネル 11…赤色用出射側偏光板 12…緑色用出射側偏光板 13…青色用出射側偏光板 14…キューブプリズム 15…投射レンズFIG. 1 is an arrangement diagram of an optical system according to the present invention. FIG. 2 is a schematic operation diagram of the liquid crystal panel of the present invention. FIG. 3 is a graph showing P-polarized light-S-polarized light separation characteristics of a green reflection dichroic mirror. FIG. 4 shows a drive circuit diagram of the present invention. DESCRIPTION OF SYMBOLS 1 ... Light source 2 ... Heat ray reflection filter 3 ... Blue reflection dichroic mirror 4 ... Green reflection dichroic mirror 5 ... Red incident side polarizing plate 6 ... Green incident side polarizing plate 7 ... Blue incident side polarizing plate 8 ... Red liquid crystal panel 9: Green liquid crystal panel 10: Blue liquid crystal panel 11 ... Red emission side polarizing plate 12 ... Green emission side polarizing plate 13 ... Blue emission side polarizing plate 14 ... Cube prism 15 ... Projection lens
Claims (1)
イトバルブと、 前記複数の透過型液晶パネルによって変調された色光を
合成する色光合成手段と、 前記色光合成手段によって合成された色光を投射する投
射手段とを備えた投射型表示装置であって、 前記複数のライトバルブのうち一部は、 ON電圧で駆動されるときに光を透過する第１の透過型液
晶パネルと、 前記第１の透過型液晶パネルの光入出射面側に配置され
た一対の偏光板とからなり、 前記複数のライトバルブのうち残りは、 OFF電圧で駆動されるときに光を透過する第２の透過型
液晶パネルと、 前記第２の透過型液晶パネルの光入出射面側に配置され
た一対の偏光板とからなることを特徴とする投射型表示
装置。A plurality of light valves respectively modulating a plurality of color lights; a color light combining means for combining the color lights modulated by the plurality of transmissive liquid crystal panels; and a color light combined by the color light combining means. A projection type display device comprising: a first transmissive liquid crystal panel that transmits light when driven by an ON voltage; And a pair of polarizing plates disposed on the light entrance / exit surface side of the transmission type liquid crystal panel, and the other of the plurality of light valves is a second transmission type that transmits light when driven by an OFF voltage. A projection display device comprising: a liquid crystal panel; and a pair of polarizing plates disposed on a light incident / exit surface side of the second transmission type liquid crystal panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2175058A JP2906601B2 (en) | 1990-07-02 | 1990-07-02 | Projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2175058A JP2906601B2 (en) | 1990-07-02 | 1990-07-02 | Projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0462533A JPH0462533A (en) | 1992-02-27 |
| JP2906601B2 true JP2906601B2 (en) | 1999-06-21 |
Family
ID=15989499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2175058A Expired - Fee Related JP2906601B2 (en) | 1990-07-02 | 1990-07-02 | Projection display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2906601B2 (en) |
-
1990
- 1990-07-02 JP JP2175058A patent/JP2906601B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0462533A (en) | 1992-02-27 |
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