KR100188957B1 - Lighting device for lcd projector - Google Patents
Lighting device for lcd projector Download PDFInfo
- Publication number
- KR100188957B1 KR100188957B1 KR1019960025213A KR19960025213A KR100188957B1 KR 100188957 B1 KR100188957 B1 KR 100188957B1 KR 1019960025213 A KR1019960025213 A KR 1019960025213A KR 19960025213 A KR19960025213 A KR 19960025213A KR 100188957 B1 KR100188957 B1 KR 100188957B1
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- KR
- South Korea
- Prior art keywords
- light
- opening
- reflecting means
- reflecting
- focus
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Classifications
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- 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
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
Abstract
본 발명은 액정프로젝트의 조명장치에 관한 것으로서, 광원, 광원이 위치되는 제1초점과 광원에서 방사된 광을 반사시켜 제2초점에 수렴시키는 타원형 반사경 및 타원형 반사기의 제2초점위치에 배치되어 타원형반사경에서 반사된 광을 선택적으로 투과시키는 개구부를 갖는 광제어판, 개구부외로 광제어판에 입사되는 광을 반사시키도록 개구부주위에 부착된 제1반사수단, 제1반사수단에서 반사된 광을 되반사시켜 개구부를 통해 투과시키는 제2반사수단을 구비함으로써, 타원형반사경으로부터 반사되어 광제어판의 개구부를 직접통과하지 못하는 무효광을 제1반사수단 및 제2반사수단에 의해 개구부내로 재집속하기 때문에 광이용효율이 증대된다.The present invention relates to an illumination device of a liquid crystal project, comprising: a light source, an elliptical reflector for reflecting light emitted from a light source, a first focus in which the light source is located, and converging to a second focus and an elliptical reflector disposed in a second focus position A light control panel having an opening for selectively transmitting the light reflected by the reflector, the first reflecting means attached to the periphery of the opening to reflect the light incident on the light control plate out of the opening, and reflecting the light reflected from the first reflecting means By providing the second reflecting means for transmitting through the opening, the light utilization efficiency is reflected by the first reflecting means and the second reflecting means to focus the invalid light reflected from the elliptical reflecting mirror and not directly passing through the opening of the light control panel. Is increased.
Description
제1도는 액정프로젝트의 종래 조명장치의 광학적 구성을 개략적으로 도시한 것이고,Figure 1 schematically shows the optical configuration of the conventional lighting device of the liquid crystal project,
제2도는 본 발명에 따른 액정프로젝트의 조명장치의 광학적 구성을 개략적으로 도시한 것이다.Figure 2 schematically shows the optical configuration of the lighting device of the liquid crystal project according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 타원반사경 2 : 광원1: elliptical reflector 2: light source
3 : 광제어판 3h : 개구부3: light control panel 3h: opening part
4 : 콜리메이팅 렌즈 5 : 제1반사수단(평면거울)4: collimating lens 5: first reflecting means (flat mirror)
6 : 제2반사수단(오목거울)6: second reflecting means (concave mirror)
본 발명은 광이용효율을 증대시킨 액정프로젝트의 조명장치에 관한 것이다.The present invention relates to a lighting device of a liquid crystal project with increased light utilization efficiency.
액정프로젝트는 액정표시소자에 평행광선을 입사시켜 발생된 영상을 투사렌즈를 통해 확대시켜 대형스크린에 투사하는 방식의 영상표시장치이다.The liquid crystal project is an image display device in which an image generated by injecting parallel light into a liquid crystal display device is enlarged through a projection lens and projected onto a large screen.
이와같은 액정프로젝트에 있어서, 액정표시소자에 입사시키는 평행광선을 얻기 위한 조명장치가 다양한 방법으로 구현되고 있다.In such a liquid crystal project, a lighting apparatus for obtaining parallel light incident on the liquid crystal display device is implemented in various ways.
제1도에 액정프로젝터의 조명장치에 대한 광학계의 구성을 개략적으로 도시하였다.FIG. 1 schematically shows the configuration of an optical system for an illumination device of a liquid crystal projector.
도시된 바와 같이, 타원반사경(1)의 제1초점(F1)에 위치된 광원(2)에서 방사된 광은 타원반사경(1)에 의해 반사되어 제2초점(F2)에 위치한 광제어판(3)에 형성된 개구부(3h)를 통과한다.As shown, the light emitted from the light source 2 located at the first focal point F1 of the ellipsoidal reflector 1 is reflected by the ellipsoidal reflector 1 and is positioned at the second focal point F2. It passes through the opening part 3h formed in ().
광제어판(3)의 개구부(3h)를 통과한 광은 광학수단에 의해 평행광선으로 된 후, 액정표시소자(미도시)에 입사된다. 상기 광학수단의 일 예로서는 콜리메이팅 렌즈(4)를 들수 있고, 콜리메이팅 렌즈(4) 이외에도 균일한 광량분포를 갖는 평행광선을 얻을 수 있는 다양한 광학수단이 구현되고 있다.The light passing through the opening 3h of the light control panel 3 becomes parallel light by optical means, and then enters into a liquid crystal display element (not shown). An example of the optical means may be a collimating lens 4, and in addition to the collimating lens 4, various optical means for obtaining parallel rays having a uniform light amount distribution are implemented.
여기서 타원반사경(1)에서 반사된 광을 개구부(3h)의 개구부의 크기에 의해 제한하는 목적은 제2초점(F2)을 크게 벗어나는 광로를 경유하는 광을 차단함으로써, 광학수단에 의해 얻고자 하는 평행광선을 보다 정밀하게 구현하는것을 포함한다. 광원(2)의 크기는 점광원으로 되는게 바람직하나, 스크린이 대형화 될 수록 요구되는 높은 광도와 비례하여 광원(2)으로 사용되는 램프의 전극사이가 넓어지기 때문에 광원(2)의 광스폿형상이 커지는 것은 피할 수 없게 되고, 그 결과 제2초점(F2)을 벗어나는 광중에서 평행광선을 구현하는데 방해가 되는 광을 차단시켜야만 한다.The purpose of limiting the light reflected by the ellipsoidal reflector 1 by the size of the opening of the opening 3h is to obtain the light by the optical means by blocking the light passing through the optical path largely out of the second focus F2. More precise implementation of parallel rays. The size of the light source 2 is preferably a point light source, but as the screen is enlarged, the light spot shape of the light source 2 is increased because the space between the electrodes of the lamp used as the light source 2 increases in proportion to the required high luminous intensity. It becomes unavoidable to become large, and as a result, the light that interferes with implementing parallel rays in the light out of the second focus F2 must be blocked.
이와 같이 구성배치된 조명장치의 광학계는 광량분포가 균일한 평행광선을 도출하는데 방해가 되는 광선을 광제어판(3)에 의해 차단시킴으로써, 광이용효율이 저하되는 문제점을 안고 있다.The optical system of the illumination device configured as described above has a problem in that the light utilization efficiency is lowered by blocking the light beams that interfere with the uniform distribution of light quantity by the light control panel 3.
본 발명은 상기와 같은 문제점을 해결하기 위해서 창안된 것으로서, 광제어판에 의해 차단되는 광을 재 사용하여 광의 이용효율을 증대시킨 액정프로젝터의 조명장치를 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a lighting apparatus for a liquid crystal projector that reuses light blocked by a light control panel to increase light utilization efficiency.
상기의 목적에 따른 본 발명의 액정프로젝터의 조명장치는 광원, 상기 광원이 위치되는 제1초점과 상기 광원에서 방사된 광을 반사시켜 제2초점에 수렴시키는 타원형 반사경 및 상기 제2초점위치에 배치되어 상기 타원형반사경에서 반사된 광을 선택적으로 투과시키는 개구부를 갖는 광제어판을 구비한 액정프로젝트의 조명장치에 있어서, 상기 개구부외로 상기 광제어판에 입사되는 광을 반사시키도록 상기 개구부주위에 부착된 제1반사수단; 및 상기 제1반사수단에서 반사된 광을 집속하고, 집속된 광을 반사시켜 상기 개구부를 통해 투과시키는 제2반사수단;을 구비한 것을 그 특징으로 한다.The illumination device of the liquid crystal projector of the present invention according to the above object is disposed in the light source, the first focus in which the light source is located and the elliptical reflector that reflects the light emitted from the light source and converges to the second focus and the second focus position. And a light control panel having an opening for selectively transmitting the light reflected by the ellipsoidal reflector, the illumination device of a liquid crystal project comprising: an article attached to the periphery of the opening to reflect light incident on the light control panel out of the opening; 1 reflecting means; And second reflecting means for focusing the light reflected by the first reflecting means, reflecting the focused light, and transmitting the light through the opening.
이하 첨부된 도면을 참조하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제2도는 본 발명에 따른 액정프로젝트의 조명장치의 광학계의 구성을 개략적으로 도시한 것이다. 참고적으로, 동일기능을 하는 요소는 동일 참조부호로 표시한다.2 schematically shows the configuration of an optical system of an illumination device of a liquid crystal project according to the present invention. For reference, elements having the same function are denoted by the same reference numerals.
도시된 조명장치는 메탈할라이드 램프와 같은 광원(2)과, 이 광원(2)을 제1초점(F1)으로 하는 타원반사경(1), 타원반사경(1)의 제2초점(F2)을 통과하여 발산하는 광을 투과시키도록 개구부(3h)가 형성된 광제어판(3), 광제어판에 부착된 제1반사수단(5) 및 제2반사수단(6) 등을 구성요소로 포함한다.The illustrated lighting device passes through a light source 2 such as a metal halide lamp, an elliptical reflector 1 having the light source 2 as the first focal point F1, and a second focal point F2 of the elliptical reflector 1. And a light control plate 3 having an opening 3h formed therein, a first reflecting means 5 and a second reflecting means 6 attached to the light control plate, and the like.
이와 같이 구성되어 광효율을 증대시키는 조명장치는 다음과 같이 동작된다.The lighting device configured as described above to increase light efficiency is operated as follows.
먼저, 타원반사경(1)의 제1초점에 위치한 메탈할라이드 램프와 같은 광원(2)으로부터 출사된 광은 타원반사경(1)에 의해 반사된다. 이때, 정확하게 제1초점(F1)위치에서 출사된 광은 타원반사경에 의해 제2초점(F2)에서 집속되고, 광원(2)의 스폿크기에 의해 제1초점(F1)을 벗어난 위치에서 출사된 광은 제2초점(F2)을 벗어나게 된다. 제2초점(F2)위치에 배치된 광제어판(3)의 개구부(3h)크기에 비례하여 제2초점(F2)을 벗어난 광의 개구부(3h)통과율이 증가하게 되지만, 광효율증가를 위해 개구부(3h)의 크기를 무한정 늘릴 수 없고, 개구부(3h)의 크기는 평행광선을 도출하는 광학수단의 보정정도에 의해 결정된다. 따라서, 제2초점(F2)위치를 크게 벗어나 개구부(3h)를 통과하지 못하는 광은 광제어판(3)의 개구부(3h)주위에 설치된 평면거울(5)과 같은 제1반사수단(5)에 의해 반사되고, 평면거울(5)에서 반사된 광은 제2반사수단(6)으로 적용된 구면 오목거울(6)에서 재반사되어 개구부(3h)를 통과하게 된다. 이와 같이, 타원반사경(1)에서 반사된 후, 개구부(3h)를 직접 통과하지 못한 광이 평면거울(5)과 구면오목거울(6)에 의해 다시 개구부(3h)로 유입됨으로써, 광이용효율이 증대된다.First, the light emitted from the light source 2 such as the metal halide lamp located at the first focus of the elliptical reflector 1 is reflected by the ellipsoidal reflector 1. At this time, the light emitted exactly at the first focal point F1 is focused at the second focal point F2 by an ellipsoidal reflector, and is emitted at a position outside the first focal point F1 by the spot size of the light source 2. The light leaves the second focus F2. The passage rate of the opening 3h of the light outside the second focus F2 is increased in proportion to the size of the opening 3h of the light control panel 3 disposed at the second focus F2, but the opening 3h is increased to increase the light efficiency. ) Cannot be increased indefinitely, and the size of the opening 3h is determined by the degree of correction of the optical means for deriving parallel rays. Therefore, the light that does not pass through the opening 3h far beyond the position of the second focal point F2 is transmitted to the first reflecting means 5 such as the planar mirror 5 provided around the opening 3h of the light control panel 3. The light reflected by the flat mirror 5 is reflected back by the spherical concave mirror 6 applied by the second reflecting means 6 and passes through the opening 3h. In this way, after reflecting from the ellipsoidal reflector 1, the light that does not pass directly through the opening 3h flows back into the opening 3h by the planar mirror 5 and the spherical concave mirror 6, thereby providing light utilization efficiency. Is increased.
제2반사수단(6)은 타원반사경(1)에서 직접반사된 광을 차단하지 않는 위치에 배치되고, 평면거울(5)에 의해 반사된 광을 집속하여 개구부(3h)내로 투과시키기에 적합하도록 반사면이 형상된다. 이와 같은 제2반사수단으로서, 구면오목거울, 타원오목거울 및 환상형 오목거울등이 이용된다.The second reflecting means 6 is disposed at a position which does not block the light reflected directly from the ellipsoidal reflector 1, and is adapted to focus the light reflected by the planar mirror 5 and transmit it into the opening 3h. The reflecting surface is shaped. As such second reflecting means, spherical concave mirrors, elliptical concave mirrors, and annular concave mirrors are used.
지금까지 설명된 바와 같이, 본 발명에 따른 액정프로젝터의 조명장치가 제공됨으로써, 광이용효율이 증대된다.As described so far, by providing the illuminating device of the liquid crystal projector according to the present invention, the light utilization efficiency is increased.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960025213A KR100188957B1 (en) | 1996-06-28 | 1996-06-28 | Lighting device for lcd projector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960025213A KR100188957B1 (en) | 1996-06-28 | 1996-06-28 | Lighting device for lcd projector |
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| Publication Number | Publication Date |
|---|---|
| KR980007620A KR980007620A (en) | 1998-03-30 |
| KR100188957B1 true KR100188957B1 (en) | 1999-06-01 |
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| KR1019960025213A KR100188957B1 (en) | 1996-06-28 | 1996-06-28 | Lighting device for lcd projector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100890736B1 (en) | 2008-02-22 | 2009-03-26 | (주)이즈미디어 | Image sensor detection lighting device and image sensor detection machine |
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1996
- 1996-06-28 KR KR1019960025213A patent/KR100188957B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100890736B1 (en) | 2008-02-22 | 2009-03-26 | (주)이즈미디어 | Image sensor detection lighting device and image sensor detection machine |
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| KR980007620A (en) | 1998-03-30 |
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