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Optical system of projection display apparatus

An optical system and display technology, applied in the field of optical systems with reflective light valves, can solve the problems of large projection lens size, large size, and affecting projection quality

Inactive Publication Date: 2003-09-17
吕和 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of this prior art optical system is: due to the angular dependence of the traditional polarized beam splitter, that is, the traditional polarized beam splitter produces polarized light in different directions for light incident on it at different angles. , resulting in serious uneven contrast and low contrast; the back focal length of the optical system is quite long, which leads to the problem that the brightness of the projected image it can provide is low or requires a larger projection lens size; and the The optical system involves severe birefringence, which seriously affects its projection quality
The main disadvantages of this existing projection display device are: the number of components is large, resulting in complex structure, high cost, and large size; the back focal length of the projection display device is quite long, resulting in low or Problems requiring larger projection lens sizes

Method used

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  • Optical system of projection display apparatus
  • Optical system of projection display apparatus
  • Optical system of projection display apparatus

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Embodiment Construction

[0015] see figure 1 and figure 2 , an optical system of a projection display in a preferred embodiment of the present invention includes an illumination system 1 and an imaging system 2 . The illumination system 1 includes a light source 12 for providing light; and an illumination module 14 for receiving the light from the light source 12 and outputting linearly polarized white light 10 .

[0016] The imaging system 2 includes a color separation assembly 20 and a projection lens 30 . The color separation assembly 20 includes a prism assembly 22, a color selection assembly 24, and three reflective light valves 25R, 25G, and 25B. The reflective light valves 25R, 25G, and 25B can respectively reflect red light, green light, and Blue light, and change the polarity of each color light, that is, change from P polarity to S polarity, or change from S polarity to P polarity. In this case, see figure 2 , the light of P polarity means that the direction of the electric field vecto...

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Abstract

An optical system for projection display is composed of a light source, a lighting module for receiving the light from light source and outputting the linearly polarized white light, a color selecting module for receiving said white light and outputting three color light beam with respective polarities, a prism assemblage, a projecting lens, and three reflection-type light valves for said three color beams.

Description

technical field [0001] The invention relates to a projection display, in particular to an optical system with a reflective light valve in the projection display. Background technique [0002] In recent years, the importance of information visualization has been widely recognized, so the demand for projection displays has also increased rapidly. High display quality, low production cost, and lightness of products are the main goals of research and development in this field. [0003] US Patent No. 5,777,789 by Chiu et al. discloses an optical system including reflective light valves, a polarizing beam splitter, color image combining prisms, an illumination system, and a screen. The main disadvantage of this prior art optical system is: due to the angular dependence of the conventional polarized beam splitter, that is, the traditional polarized beam splitter produces polarized light in different directions for light incident on it at different angles....

Claims

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Application Information

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IPC IPC(8): G02B5/04G02B27/18G02B27/28H04N9/31
Inventor 吕和
Owner 吕和
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