A color separation LCD backlight by pixelized illumination is described to eliminate conventional absorbing-type color filters, which is expected to enhance the gain factor of power efficiency. Several pixel mosaic configurations (RGBG stripe, RGBG diagonal and RBGG quad arrangements) are proposed for different applications.
The major efficiency loss in current liquid crystal displays(LCD) are the absorption in polarizers and color filter, and both can be resolved with decent backlight design which takes light polarization and color separation into consideration. Those improvement schemes on the backlight normally will not trade off the image quality readily achieved in the commercial LCD. Both polarization and color separation schemes for the backlight are reviewed with categorization on the basic concept, followed by the proposal of possible combinations for both direct lit and edge lit configuration with the consideration on the availability of associated components. Two total solutions, including polarization conversion module for LED and pixelized backlight with RGB LED for direct lit and edge lit respectively, are given with demonstration of preliminary result achieved so far as the efficiency improvement schemes for LCD backlight.
A diffractive laser beam shaper has been proposed as a lossless approach to transfer a Gaussian
laser beam into a thin line beam with a uniform distribution along the line direction for scanning material
processing or illumination application. With the consideration for the feasibility of fabrication, the optical
performance of the diffractive beam shaper with its surface relief quantized at different levels has been
analyzed with scalar diffraction theory, which shows that an 8 level solution is sufficient for keeping the
uniformity in the line direction while the focusing function in the orthogonal dimension needs to be
performed by an extra cylindrical lens.
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