Optical device for eliminating stray light
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 18, 2002
Grant Date -
May 16, 2002
app pub date -
Feb 23, 2001
filing date -
Nov 13, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
An optical device for eliminating the stray light is provided at a stop of an illuminating system in an optical system of 'digital light processing' (DLP). The optical system consists of a stop of an illuminating system, a 'digital micromirror device' (DMD), a stop of a projection lens, and a screen while the stray light is a chromatic halo at the peripheral area on the screen. Wherein, the optical device includes a reflecting mirror designed of an adjustable angle and installed near periphery of the stop of the illuminating system. The chromatic halo is generated from the light beam at the periphery area. And, the light beam is reflected from the DMD and is transmitted into the stop of the projection lens, and then is projected on the screen. And, the reflecting mirror is used to reflect the light beam at the periphery area so as to divert the original transmitting path of the light beam such that the light beam is reflected from the DMD and is uniformly transmitted into the stop of the projection lens. Thus, the contrast ratio of the illuminating system is increased, and the quality of the output image is improved, and the efficiency of the DLP system is enhanced, and the luminance projected on the screen is improved.
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