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Abstract

A full color electronic display device using two liquid crystal light valve image forming sources and having two optical paths is suitable for use in projection or direct view display applications. The two-path LCLV device generates two separate, spatially coherent color images which are combined by additive spatial superposition to produce a single, full-spectrum, composite color image. One image is composed from a spectral band of light from the long (red) and medium (green) wavelength regions of the visible light spectrum, and is formed by a liquid crystal image forming source having a high resolution which determines the effective spatial resolution of the final image. The second image is composed from a spectral band of light from the short (blue) wavelength region of the visible light spectrum, and is formed by a liquid crystal image forming source having a resolution less than that of the red and green image, thereby producing a brighter blue light image. These two optical paths and their properties are nominally matched to the characteristics of the chromatic and luminance processing channels of the human visual system. The device produces bright, sharp, and high resolution full-color images using a relatively simple, more easily aligned optical system. The composite image may be either directly viewed or optically projected using a conventional projection lens assembly onto an intermediate viewing surface. Several embodiments of the two-path liquid crystal light valve color display are described herein, each possessing specific features and advantages over existing electronic color displays.

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First Claim