KR970068565A

KR970068565A - Optical system of liquid crystal video projector

Info

Publication number: KR970068565A
Application number: KR1019960007016A
Authority: KR
Inventors: 이종진
Original assignee: 김주용; 현대전자산업 주식회사
Priority date: 1996-03-15
Filing date: 1996-03-15
Publication date: 1997-10-13
Also published as: KR100217173B1

Abstract

1. 청구범위에 기재된 발명이 속한 기술분야1. Technical field to which the invention described in the claims belongs

액정비디오 프로젝터의 광학시스템.Optical system of liquid crystal video projector.

2. 발명이 해결하려고 하는 기술적 과제2. Technical Challenges to be Solved by the Invention

색분리 및 합성을 위한 별도의 다이크로익 미러를 사용함에 따른 구조 및 작업의 복잡성, 그리고 이에 따른 시스템 전체적인 크기의 증가를 해결하려고 하는 것임.The goal is to solve the complexity of the structure and operation as a result of using a separate dichroic mirror for color separation and composition, and thus the overall system size increase.

3. 발명의 해결방법의 요지3. The point of the solution of the invention

광원(100A)에서 나온 백색광 중에서 P파는 투과시키고 S파는 수직방향으로 반사시키는 편광빔분리기(100)와, 상기 편광빔분리기(100)에 의해서 반사되어 입사된 백생광 중에서 적색편파는 일측 수직방향으로 청색편파는 타측 수직방향으로 반사시키고 나머지 색편파는 투과되도록 한 색분리/합성프리즘(200)과, 상기 색분리/합성프리즘(200)에 의해서 반사되어 나온 각각의 색편파가 결상되고 전압의 인가로 입사된 S파를 P파로 변환시키는 녹, 적, 청색용 반사형 액정판넬(300)(310)(320)과, 상기 녹, 적, 청색용 반사형 액정판넬(300)(310)(320)에 의해서 P파로 변환 및 반사된 후 색분리/합성프리즘(200)에 의해서 합성되어 편광빔분리기(100)를 통해 각각의 색편파를 스크린에 투사시키는 투사렌즈계(400)로 구성된 것을 특징으로 한 것이다.A polarized beam splitter 100 for transmitting the P wave in the white light emitted from the light source 100A and reflecting the S wave in the vertical direction and a polarized beam splitter for reflecting the red polarized wave from the white reflected light incident on the polarized beam splitter 100, A color separating / synthesizing prism 200 for reflecting the blue polarized wave in the other vertical direction and allowing the remaining polarized polarized waves to pass therethrough, a color separating / synthesizing prism 200 for forming each color polarized wave reflected by the color separating / synthesizing prism 200, Red, and blue reflective liquid crystal panels 300, 310, and 320 for converting an S wave incident on the liquid crystal panel 300 into a P wave, and reflective liquid crystal panels 300 and 310 And a projection lens system 400 which is synthesized by the color separation / synthesis prism 200 after being converted into and reflected by the P wave by the polarizing beam splitter 100 and projects the respective color polarized waves through the polarizing beam splitter 100 onto the screen will be.

4. 발명의 중요한 용도4. Important Uses of the Invention

콤팩트하면서도 구조가 간단한 액정비디오 프로젝터를 제작하는데 적용되는 것임.It is applied to the production of a compact and simple structure liquid crystal video projector.

Description

Optical system of liquid crystal video projector

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제 5 도는 본 발명의 일 실시예를 보인 사사도, 제 6 도는 제5도의 광로도, 제 8 도는 일반적인 반사형 액정의 동작원리를 설명하기 위한 예시도, 제 9 도는 본 발명의 다른 실시예를 보인 사시도, 제 10 도는 제9도의 광로도.FIG. 5 is an explanatory view showing an embodiment of the present invention, FIG. 6 is an optical path diagram of FIG. 5, FIG. 8 is an exemplary view for explaining the operation principle of a general reflective liquid crystal, FIG. 10 is an optical path diagram of FIG. 9; FIG.

Claims

A polarized beam splitter 100 for transmitting a P wave in the white light emitted from the light source 100A and reflecting the S wave in a vertical direction; A color separating / synthesizing prism 200 for red polarized wave of the white light reflected by the polarized beam splitter 100 to reflect the blue polarized wave in the vertical direction of one side in the vertical direction and transmit the remaining polarized wave in the other vertical direction; A reflection type liquid crystal panel 300 (310) for rust, red, and blue for forming an image of each color polarized wave reflected by the color separating / synthesizing prism 200 and converting an S wave incident upon application of voltage into a P wave, (320); Is converted and reflected by the R, G, and B reflective liquid crystal panels 300, 310 and 320 and then synthesized by the color separating / synthesizing prism 200 and transmitted through the polarizing beam splitter 100 And a projection lens system (400) for projecting the color polarized wave of the liquid crystal projector (100) onto a screen.

The prism of claim 1, wherein the color separating / synthesizing prism (200) comprises first, second, and third triangular prisms (300) and (310) disposed on the side of the reflective liquid crystal panels A body 210 formed by joining a first triangular prism 220, a second triangular prism 223 and a polarizing beam splitter 100; The third triangular prism 222 and the fourth sensory prism 223 coated with the red light to reflect the red light to the reflective liquid crystal panel 310 for red light and the blue light and the green light to transmit therethrough are included in the white light incident from the polarized beam splitter 100, (230); The first triangular prism 22 and the third triangular prism 222 coated with the blue light and the green light to reflect only the blue light to the reflective liquid crystal panel 320 for blue and transmit the green light, Bonding surface B 240; A second triangular prism 221 and a fourth triangular prism 223 which are coated to reflect blue light from the white light incident from the polarized beam splitter 100 toward the reflection type liquid crystal panel 320 for blue and transmit red and green light, A joint surface C (250); The first triangular prism 220 and the second triangular prism 221 coated with the red light and the green light having passed through the joint surface C 250 and the green light respectively reflect the red light to the reflective liquid crystal panel 310 for red, And a joint surface D (260).

A polarization conversion optical system 510 for reflecting S wave in white light emitted from light source 510A and converting P wave into S wave; A polarization beam splitter (520) for vertically reflecting the S wave reflected or converted by the polarization conversion optical system (510); A color separation / synthesis prism 530 for separating and synthesizing the white light reflected by the polarized beam splitter 520; Each of the color polarized waves separated by the color separating / synthesizing prism 530 is formed, and reflection type liquid crystal panels 540, 541, 542 (for red, green and blue) 542 )and; 530, 541, and 542 after being converted to and reflected by the P wave and then passing through the color separating / synthesizing prism 530 and the polarizing beam splitter 520, And a projection lens system (550) for projecting color polarized waves onto a screen.

The polarization conversion system according to claim 3, wherein the polarization conversion optical system (510) comprises: a first prism (511) for reflecting the S wave and transmitting the P wave; A second prism 512 for vertically reflecting the P wave transmitted through the first prism 511; And a half wave plate (513) for converting the P wave reflected by the second prism (512) into an S wave.

The optical system of claim 4, wherein the first prism (511) is formed by a square prism having an interface (511A) by joining two triangular prisms.

5. The optical system of claim 4, wherein the second prism (512) is formed of a triangular prism and bonded to a first prism (511).

※ Note: It is disclosed by the contents of the first application.