Optical mask liquid crystal projection color developing method and its device

Abstract

The invention is an optical mask liquid crystal projection-based colour photo enlarging and printing method: arranging an optical mask plate between an image-steering lens and a projection lens to make the optical mask plate and a liquid crystal screen that is on the other side of the image-steering lens and has total pixels of A X B, as well as printing paper placed on the other side of the projection lens, all situated in an image conjugate position, fixing the optical mask plate, the image-steering lens and the liquid crystal screen into a whole framework, arranging periodically arranged light-transmitting windows on the optical mask plate, where each periodical size is Delta x X Delta y equal to the imaging size of each pixel of the liquid crystal screen, the size of each light-transmitting window is delta x X delta y, the Delta x and Delta y are integral times N of the delta x X delta y, respectively, making 2D translation on the whole framework relative to the printing paper, the liquid crystal screen changes image input signal once each time of translation and makes the exposure with red, green and blue lights on the printing paper until the translating times is N in the X and Y directions, respectively, and finally obtaining continuous latent image with total pixels of NA X NB on the printing paper.

Description

technical field [0001] The invention relates to a liquid crystal projection color expansion method and a device thereof. technical background [0002] At present, the LCD screens used in LCD projection and color expansion machines are all transmissive TFT-LCDs, and its mainstream applications are projectors, televisions, and virtual helmets. If this type of LCD screen is used in LCD projection digital color expansion machines, if the method of "pixel segmentation, step-by-step exposure" is not adopted, there will be non-exposed areas caused by the shadows of liquid crystal pixels in the color expansion photos, which will produce white visually. vertical and horizontal lines, resulting in the so-called white edge "mosaic" phenomenon; if the method of "pixel segmentation, step-by-step exposure" is adopted, it will cause overexposure of the edge of each pixel in the color expansion photo, which not only reduces the effective resolution of the color expansion photo rate, it wil...

AI Technical Summary

Problems solved by technology

If this type of LCD screen is used in LCD projection digital color expansion machines, if the method of "pixel segmentation, step-by-step exposure" is not adopted, there will be non-exposed areas caused by the shadows of liquid crystal pixels in the color expansion photos, which will produce white visually. vertical and horizontal lines, resulting in the so-called white edge "mosaic" phenomenon; if the method of "pixel segmentation, step-by-step exposure" is adopted, it will cause overexposure of the edge of each pixel in the color expansion photo, which not only reduces the effective resolution of the color expansion photo rate, it will also cause deep edge "mosaic" phenomenon

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