Invention Grant
US06367935B1 Method and device for eliminating image speckles in scanning laser image projection
失效
扫描激光图像投影中消除图像斑点的方法和装置
- Patent Title: Method and device for eliminating image speckles in scanning laser image projection
- Patent Title (中): 扫描激光图像投影中消除图像斑点的方法和装置
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Application No.: US09355288Application Date: 1999-10-12
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Publication No.: US06367935B1Publication Date: 2002-04-09
- Inventor: Lingli Wang , Theo Tschudi , Thorsteinn Halldorsson , Palmi Petursson
- Applicant: Lingli Wang , Theo Tschudi , Thorsteinn Halldorsson , Palmi Petursson
- Priority: DE19703730 19970131
- Main IPC: G03B2114
- IPC: G03B2114

Abstract:
A method for the elimination of image speckles in a scanning laser projection is suggested, in which a phase hologram is used for dividing the illumination beam of the projector into partial beams. The partial beams are heterodyned again on the image screen within the image element (pixels) to be projected in such a way that differing speckle patterns are formed which average each other out in the eye of the viewer over time and/or space. Thus, a device is provided especially for the laser projection which substantially eliminates or reduces the speckles at the viewer. However, the beam form and the beam density are hardly or not changed.
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