KR960020444A

KR960020444A - LCD Projector

Info

Publication number: KR960020444A
Application number: KR1019940028868A
Authority: KR
Inventors: 노봉규
Original assignee: 노봉규
Priority date: 1994-11-02
Filing date: 1994-11-02
Publication date: 1996-06-17

Abstract

본 발명은 편광효율을 높여 화면을 밝게한 액정프로젝터에 관한 것이다.The present invention relates to a liquid crystal projector that brightens the screen by increasing the polarization efficiency.

종래에는 두개의 액정광학계를 썼기 때문에 장치고정이 어렵고 액정셀을 비롯한 광학부품이 두 배가 더 필요했기 때문에 비용이 많이 들었다. 또한 공간도 커지는 단점이 있다.Conventionally, since two liquid crystal optical systems are used, it is difficult to fix the device and cost twice as many optical components including a liquid crystal cell are needed. In addition, there is a disadvantage that the space becomes larger.

본 발명의 액정 프로젝터는 (LCD projector) 액정셀(40) (41)을 상화면과 하화면으로 나누고, 편광광속분할기(polarizing beam splitter) (20)를 지나서 직선편광된 두 빛을 액정셀의 상화면과 하화면에 따로 지나게하고, 이 두빛을 편광광속분할기(20)에서 합하여 빛의 이용효율을 두배로 높였다. 상하 화면이 투사경으로부터 같은 상면(image plane)있도록 보상기를 상화면에 놓았다. 또한 액정셀의 구동 IC를 줄이기 위하여 신호선을 상하화면이 공유하도록 하였다.The liquid crystal projector of the present invention divides the liquid crystal cells 40 and 41 into an upper screen and a lower screen, and transmits two light polarized linearly past the polarizing beam splitter 20 to the upper surface of the liquid crystal cell. Passing the screen and the lower screen separately, the two lights were combined in the polarized light splitter 20 to double the utilization efficiency of light. The compensator was placed on the top screen such that the top and bottom screens were the same image plane from the projection mirror. In addition, in order to reduce the driving IC of the liquid crystal cell, the upper and lower screens share the signal lines.

본 발명의 액정프로젝터는 HDTV의 수상기와 대형 TV의 수상기에 쓰일 수 있다.The liquid crystal projector of the present invention can be used in the receiver of the HDTV and the receiver of the large TV.

Description

LCD Projector

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제4도는 본 발명의 단색 투과형 액정프로젝터의 광학계,4 is an optical system of the monochrome transmissive liquid crystal projector of the present invention,

제5도는 본 발명의 단색 반사형 액정프로젝터의 광학계,5 is an optical system of the monochrome reflective liquid crystal projector of the present invention,

제6도는 본 발명의 액정프로젝터에 쓰이는 액정셀의 전극 및 화면구조.6 is an electrode and a screen structure of a liquid crystal cell used in the liquid crystal projector of the present invention.

Claims

The liquid crystal projector divides the liquid crystal cells 40 and 41 of the (LCD projector) into an upper screen and a lower screen, and transmits two linearly polarized light through the polarizing beam splitter 20 to the upper screen of the liquid crystal cell. A liquid crystal projector that passes these lights separately on the lower and lower screens, and combines these lights in a polarized light splitter (20 or 20).

The liquid crystal projector according to claim 1, wherein a compensator (21) is used so that an image plane of an upper screen and a lower screen coincide with each other.

The liquid crystal projector according to claim 1, wherein the upper and lower screens share the signal line.

The liquid crystal projector according to claim 1, wherein a polarizing plate (43) having a polarization degree larger than that of the polarizing light splitter is disposed between the polarizing light splitter (20) and the liquid crystal cell.

The liquid crystal projector according to claim 1, wherein a phase plate is provided between the liquid crystal cell and the polarized light beam splitter (20).

The liquid crystal projector according to claim 1, wherein the upper screen and the lower screen are separated by a predetermined distance.

※ Note: The disclosure is based on the initial application.