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Optical system for an LCD projector
| Details |
Inventors: Lee, Seung G.;
Assignee: Goldstar Co., Ltd. (Seoul, KR)
Primary Examiner: Groody; James J.
Assistant Examiner: Powell; Mark R.
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch
An optical system for an LCD projector comprising an illuminating device, an infrared filter, an optical system and a projecting lens comprises a 45.degree. horizontally inclined blue light tranmission filter, a 45.degree. horizontally inclined green light reflection mirror, a 45.degree. horizontally inclined red image reflection mirror, a 45.degree. horizontally inclined blue image transmission filter, three total reflection mirrors, three condensing lenses, three LCD panels, and separates red, green and blue light elements from the light having been transmitted through the infrared filter, then reemerging an image in respective colors by using the separated red, green and blue light elements in order to compose the reemerged image. The projector lens projects the composed image from the optical system on a screen as an enlarged image and the LCD projector according to this invention can provide a compensation of the red light radiation by red optical path considerably longer than those of the green and the blue optical paths, a considerably high luminance due to using the metal halide lamp, low manufacturing cost, an image of a good resolution power because of reducing the vignetting, also a compactness of its projection lens. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a an optical system for LCD projector which can provide high luminance and high resolution color image, whereby the above-mentioned problems encountered in the conventional LCD projector can be solved.
In accordance with the present invention, the above-mentioned object can be accomplished by providing a LCD projector comprising an illuminating device having a light source, an infrared filter positioned on an original optical path from the light source and adapted for filtering out infrared rays from the light emitted by the light source, an optical system for sequentially separating red, green and blue light elements from the light transmitted through the infrared filter and then reemerging an image in respective colors by means of the separated R, G and B light elements in order to compose the reemerged image, a projection lens projecting the composed image on a screen as an enlarged image.
In this LCD projector according to the present invention, the optical comprises a 45.
degree.
inclined blue light transmission filter positioned on the original optical path in a distance after the infrared filter and adapted for transmitting blue light element of the light from the infrared filter, and simultaneously reflecting R and G light elements along a first R and G optical path perpendicular to the original optical path; a first condensing lens positioned on the original optical path in a distance after the B light transmission filter in order to condense the blue light element; a first LCD panel positioned on the original optical path closely after the first condensing lens in order to reemerge blue color image upon receiving the blue light element condensed by the first condensing lens, a first 45.
degree.
inclined total reflection mirror positioned on a first B image path, parallel with the original optical path, after the first LCD panel in order to reflect the B color image along a second B image path perpendicular to the first B image path; a 45
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LCD 
