05633755 is referenced by 53 patents.

A projection apparatus is disclosed that can be used for projection TV and related applications. The apparatus comprises a light source, a projection optical system, a DMD with multiple micromirrors, and a controller for individually controlling the tilt of the micromirrors. The projection optical system comprises, in order from the DMD side, a first lens group, an aperture stop, and a second lens group. An illumination stop is situated between the first and second lens groups. Light from the light source passes through the illumination stop and the first lens group to impinge on the DMD. The controller coordinatedly controls the tilt of the micromirrors in the DMD so that the impinging light is selectively reflected to one or the other of the aperture stop and the illumination stop, thereby eliminating ghost-forming reflections of light not projected onto a screen.

Title
Projection apparatus and method
Application Number
8/611304
Publication Number
5633755
Application Date
March 5, 1996
Publication Date
May 27, 1997
Inventor
Yukiharu Okubo
Kawasaki
JP
Yutaka Iwasaki
Yokohama
JP
Kazuya Okamoto
Yokohama
JP
Yuji Manabe
Kamakura
JP
Agent
Klarquist Sparkman Campbell Leigh & Whinston
Assignee
Nikon Corporation
JP
IPC
G03B 21/28
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