Colorization of LC Projection TV on Optical Configurations : VISION

概要

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The optical efficiency and colorization on the optical configuration of Liquid-Crystal (LC) projection TV were studied. The functioning of R, G, and B color filters of a LC projection TV is defined by the transmittance and reflectance spectra of dichroic mirrors (DMs). The S- or P-polarized spectra of transmittance and reflectance of dichroic mirrors become different from each other when the light is obliquely incident. The choice of LC panels, normally black (NB) or white (NW), along with its orientation with respect to dichroic mirrors would influence the color exhibition and optical efficiency of the LC projection system. For the same optical components, S-polarized was found to have both a higher optical efficiency (39.89% vs. 25.12%), as well as a better color reproduction than P-polarized light. The S-polarized transmittance of dichroic mirrors is higher and the spectra are smoother than those of P-polarized transmittance spectra. The NB type LC panel, where a polarizer is positioned parallel to S-polarization, was observed to perform more effectively from an optical perspective than a NW LC panel in a LC projection TV.
社団法人映像情報メディア学会の論文
1993-10-28