Importance

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Abstract

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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First Claim