US Patent Application No: 2002/0105,622

Number of patents in Portfolio can not be more than 2000

Method and apparatus for use in a projection display to prevent ghost images on or near a projected image

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Abstract

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A method for use in a projection display to prevent ghost images on or near a projected image, wherein the projection display comprises an illumination system and an imaging system, the illumination system including a light source; an illumination module; a field lens; and a reflection device, the imaging system includes the field lens; an imaging module including a stop; and a screen, and the method comprises the step of applying a multi-layer anti-reflection coating on the first surface S1 of the field lens facing the light beam coming from the light source and the step of applying a dielectric coating on the surface S2 of the imaging module facing the light beam coming from the field lens. The multi-layer anti-reflection coating is used for reducing the reflectance of the surface S1 with respect to the visible light by sacrificing a little of red light to get better transmittance of green and blue light so that the green and blue light pass the field lens and the red light incident on the surface S2 is reflected by the dielectric coating on the surface S2 and therefore a ghost image is prevented from being formed.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CORETRONIC CORPORATIONHSINCHU242

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Wang, Sze-Ke Chu-Nan, TW 41 64

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
FUJI PHOTO OPTICAL CO., LTD. (1)
6,783,246 Ghost image prevention element for imaging optical system 0 2002
 
YOUNG OPTICS INC. (1)
7,760,437 Projector apparatus having a shielding plate to prevent formation of ghost image in the projected image 0 2005