Importance

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Abstract

An active matrix LCD light valve between crossed polarizers, utilizing individual transistors to control each 'pixel area' of the LCD and storage elements to store signal data for each pixel, with optically shielded 'dead spaces' between pixels to eliminate electric field crosstalk and non-information-bearing light bleed through, is illuminated with a bright independent light source which creates a video image projected via specialized projection optics onto an internal or external screen without distortions, regardless of the angle of projection onto the screen. Use of heat sinks, IR reflective coatings, heat absorbing optics, optional fluid, and a thermistor controlled pixel transistor bias voltage injection servo circuit stabilizes image performance, maintaining accurate color and contrast levels as the LCD changes temperature. In one embodiment of the invention, use of a multi-color LCD with a stepped cavity, producing different thicknesses of LCD for the different wavelengths that pass through it, allows a linear correspondence between the wavelengths passing through the LCD to produce true black, high contrast, and CRT-like color rendition. A dichroic mirror arrangement is used to overlap differently colored pixels and a striped mirror system is used to duplicate and offset the resulting 'full color' pixels or a lens system is used to expand existing pixels to fill the 'dead spaces' between pixels in the projected image, creating a continuous image with no apparent stripes or dots. A special venetian-blind type of screen is also disclosed and methods for using the system to view three dimensional video are also explained.

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First Claim