Optical: systems and elements – Projection screen
Patent
1996-03-05
1997-05-27
Metjahic, Safet
Optical: systems and elements
Projection screen
359224, 359230, 355 67, 348789, 348791, 348744, G03B 2128
Patent
active
056337558
ABSTRACT:
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.
REFERENCES:
Hornbeck, "Deformable-Mirror Spatial Light Modulators," SPIE Critical Reviews Series 1150:86-102 (1990).
Mignardi, "Digital Micromirror Array for Projection TV," Solid State Tech., pp. 63-68, (1994).
Sampsell, "Late-News Paper: An Overview of the Digital Micromirror Device (DMD) and Its Application to Projection Displays," SID 93 Digest, pp. 1012-1015, (1993).
Iwasaki Yutaka
Manabe Yuji
Okamoto Kazuya
Okubo Yukiharu
Malley D. P.
Metjahic Safet
Nikon Corporation
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