Large area projection liquid-crystal video display system with inherent grid pattern optically removed

摘要

A relatively small and low-cost system is provided for projecting a large and bright television image onto a screen. A minature liquid crystal array is driven by video circuitry to produce a pattern of transparencies in the array corresponding to a television image. Light is directed against the rear surface of the array to illuminate it, while a projection lens lies in front of the array to project the image of the array onto a large screen. Grid lines in the liquid crystal array are eliminated by a spacial filter which comprises a negative of the Fourier transform of the grid.