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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 problems that the utilization rate of light energy needs to be improved, so as to improve the utilization rate of light energy, reduce the cost of design and processing, and facilitate miniaturization Effect

Inactive Publication Date: 2008-07-30
ZHEJIANG JINCHENG SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention discloses a reflective light valve micro-projector, which solves the technical problems that the utilization rate of light energy needs to be improved and further miniaturized in the existing micro-projector with LED as a light source

Method used

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  • Reflexion type light-valve minisize projection apparatus
  • Reflexion type light-valve minisize projection apparatus
  • Reflexion type light-valve minisize projection apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1, as shown in FIG. 4 , the lighting source 401 adopts a plurality of single-color LEDs, and the light emitted by the LEDs is passed through the light mixing tube 4021 of the lighting optical system 402, and each LED is subjected to light mixing treatment to make the light uniform. Afterwards, it is synthesized into a colored or white light beam by the dichromatic mirror 4022, and then enters the PBS403 through the polarizer 4023 and the illumination lens 4024. Reflected by the PBS 403 into the first mirror 4041 of the projection objective 404 , the aperture stop 406 is located behind the first mirror 4041 of the projection objective 404 , close to the PBS 403 . Finally, the projection objective lens 404 and the illumination optical system 402 together irradiate the light emitted by the LED onto the reflective light valve 405 substantially uniformly, and each pixel of the reflective light valve 405 respectively modulates the illumination light and transforms t...

Embodiment 2

[0039]Embodiment 2, as shown in FIG. 5 , the lighting source 501 adopts a plurality of single-color LEDs, and the light emitted by the LEDs is passed through the light mixing tube 5021 of the lighting optical system 502, and each LED is subjected to light mixing treatment to make the light uniform. Afterwards, it is synthesized into a colored or white light beam by the dichromatic mirror 5022, and then enters the PBS503 through the polarizer 5023 and the illumination lens 5024. Reflected by the PBS 503 into the first mirror 5041 of the projection objective 504 , the aperture stop 506 is located in front of the first mirror 5041 of the projection objective 504 , close to the PBS 503 . Finally, the projection objective lens 504 and the illumination optical system 502 together irradiate the light emitted by the LED onto the reflective light valve 505 substantially uniformly, and each pixel of the reflective light valve 505 respectively modulates the illumination light and transfor...

Embodiment 3

[0040] Embodiment 3, as shown in FIG. 6 , the lighting source 601 adopts a plurality of single-color LEDs, and the light emitted by the LEDs is passed through the light mixing tube 6021 of the lighting optical system 602, and each LED is subjected to light mixing treatment to make the light uniform. Afterwards, it is synthesized into a colored or white light beam by the dichromatic mirror 6022, and then enters the PBS603 through the polarizer 6023 and the illumination lens 6024. The aperture stop 606 is located in front of the PBS 603 after being reflected by the PBS 603 into the first mirror 6041 of the projection objective 604 . Finally, the projection objective lens 604 and the illumination optical system 602 together irradiate the light emitted by the LED onto the reflective light valve 605 substantially uniformly, and each pixel of the reflective light valve 605 respectively modulates the illuminating light and transforms the polarization state of the incident light, and t...

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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.

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. As shown in FIG. 1 , a typical reflective light valve projector 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 reflective li...

Claims

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Application Information

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IPC IPC(8): G03B21/14G03B21/20G02B27/28G02B26/08
Inventor 聂瑾禄石岩陆祖康
Owner ZHEJIANG JINCHENG SCI & TECH
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