LIGHT BLOCKING, PIXEL ENHANCEMENT AND PHOTOCURRENT REDUCTION IN ACITVE MATRIX LIQUID CRYSTAL DISPLAYS

摘要

A back plate structure for a reflective type active matrix liquid crystal display and methods for forming the same, is described. The structure includes an array of reflective electrodes (e.g., 11, 12, 21, and 22) for selectively altering the molecular alignment of liquid crystal material confined above each of the reflective electrodes and an array of light shields (e.g., 16) spatially offset with the array of reflective electrodes so that the light shields block light passing through portions of gaps (e.g., 14 and 15) formed between adjacent reflective electrodes. Each of the reflective electrodes also has a corresponding light shield which is electrically connected to that reflective electrode so that the liquid crystal material confined above portions of the gaps between adjacent reflective materials can also be altered by the electrically connected light shields. The structure also includes a plurality of positively biased diffusion regions (e.g., 300) formed in areas where incident light is expected to strike the surface of the silicon substrate, where the positively biased diffusion regions act as electron "collectors" and the grounded silicon substrate (e.g., 70) acts as a hole "collector" for any electrons and holes generated by the photons of light striking the surface of the silicon substrate.