Color separation optical plate for use with LCD panels
First Claim
1. A color image projection system comprising, in named sequence, means to generate white light, a color separation plate, an LCD (Liquid Crystal Display) panel, a projection lens and a screen, characterized in that the color separation plate is an array of transmissive direct vision microprisms, each microprism comprising at least a first prism of one index of refraction and a second prism of a different index of refraction.
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Abstract
A color separation optical plate is described which is superimposed onto a transmissive LCD panel. The color separation plate separates incident white light into its red/green/blue (RGB) components and guides each component through the appropriate sub-pixel (dot) of the LCD panel. The color separation plate utilizes a microprism array of direct vision microprisms each having a combination of refractive and gradient index optics to concentrate the light onto the appropriate dot and to separate the colors. This combination has the theoretical capability of increasing color LCD panel transmissivity by as much as a factor of six.
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Citations
21 Claims
- 1. A color image projection system comprising, in named sequence, means to generate white light, a color separation plate, an LCD (Liquid Crystal Display) panel, a projection lens and a screen, characterized in that the color separation plate is an array of transmissive direct vision microprisms, each microprism comprising at least a first prism of one index of refraction and a second prism of a different index of refraction.
- 6. The combination of an LCD (Liquid Crystal Display) having at least ten thousand TFT (Thin Film Transistor) light valves and a color separation plate to direct light on the LCD, the separation plate comprising an array of at least three hundred transmissive direct vision microprisms, each microprism comprising a first prism of one index of refraction and a second prism of a different index of refraction.
- 13. A color image direct view system, comprising, in the named sequence, means to generate white light, a color separation plate and an LCD (Liquid Crystal Display) panel, characterized in that the color separation plate is an array of transmissive direct vision microprisms, each microprism comprising a first prism of one index of refraction and a second prism of a different index of refraction.
Specification