Reflexion type light-valve minisize projection apparatus

A micro-projector and reflective technology, which is applied in optics, instruments, optical components, etc., can solve the problem that the utilization rate of light energy needs to be improved, and achieve the effect of improving the utilization rate of light energy, reducing the volume, and reducing the cost of design and processing
CN101231452BInactive Publication Date: 2010-04-14ZHEJIANG JINCHENG SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG JINCHENG SCI & TECH
Publication Date
2010-04-14
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention belongs to the technical field of projection display equipment, in particular to a reflective light-valve mini projector which comprises a light source using a LED, a color compounding device for compounding light beams from the LED to a colored or white light beam, a reflective light valve used as a spatial light modulator for modulating the light beam compounded by the color compounding device to form a picture source for projection display, a polarization beam splitter for splitting light beams with different polarization directions before and after modulation, and a projection objective lens for amplifying or projecting the light beams after color compounding and modulation with the reflective light valve to a screen and positioned behind the polarization beam splitter. Firstly, the inventive mini projector increases the utilization rate of light energy and increases the brightness of projected picture. Furthermore, the PBS of the mini projector is not positioned between the reflective light valve and the projection objective lens or between the reflective light valve or filed lens and the projection objective lens, so that the size of PBS is reduced, realizing the miniaturization of the mini projector.
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Description

technical field

[0001] The invention belongs to the technical field of projection display devices, in particular to a micro-projector for amplifying or projecting LED illumination light onto a display screen after being modulated by a reflective light valve. Background technique

[0002] At present, with the continuous improvement of user demands, digital products are becoming more and more portable, and projectors are no exception, and people's requirements for miniaturization are getting higher and higher. Such as figure 1 Shown is a typical reflective light valve projector, which includes an illumination light source 105 , an illumination optical system 104 , a polarizing beam splitter (ie PBS) 102 , a reflective light valve 103 , and a projection objective lens 101 . The light emitted by the illumination source becomes polarized light through the illumination optical system and is output to the polarizing beam splitter, and reflected to the reflective light valve. The r...

Claims

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