Invention Application
- Patent Title: 2-DIMENSIONAL IMAGE DISPLAY DEVICE, ILLUMINATION LIGHT SOURCE AND EXPOSURE ILLUMINATION DEVICE
- Patent Title (中): 二维图像显示装置,照明光源和曝光照明装置
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Application No.: US13204925Application Date: 2011-08-08
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Publication No.: US20110292350A1Publication Date: 2011-12-01
- Inventor: Kenichi KASAZUMI , Yasuo Kitaoka , Kiminori Mizuuchi , Kazuhisa Yamamoto
- Applicant: Kenichi KASAZUMI , Yasuo Kitaoka , Kiminori Mizuuchi , Kazuhisa Yamamoto
- Priority: JP2005-178769 20050620; JP2005-178770 20050620
- Main IPC: G03B21/14
- IPC: G03B21/14 ; G02B26/10

Abstract:
A 2-dimensional beam scan unit reflects emission beams from a red laser light source, a green laser light source and a blue laser light source and scans in a 2-dimensional direction. Diffusion plates diffuse the respective light beams scanned in the 2-dimensional direction to introduce them to corresponding spatial light modulation elements. The respective spatial light modulation elements modulate the respective lights in accordance with video signals of the respective colors. A dichroic prism multiplexes the lights of the three colors after the modulation and introduces the multiplexed lights to a projection lens so that a color image is displayed on a screen. Since the 2-dimensional light emitted from the beam scan unit is diffused to illuminate the spatial light modulation element, it is possible to change the optical axis of the beam emerging from the light diffusion member for irradiating the spatial light modulation element moment by moment, thereby effectively suppressing speckle noise.
Public/Granted literature
- US08317333B2 Method and device for converting an emission beam from a laser light source into 2-dimensional light Public/Granted day:2012-11-27
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