Method for producing high efficiency polarizing filters

Abstract

The manufacturing cost of color liquid crystal displays depends on improving the yield of making color filter arrays and the polarization efficiency of polarizers to increase the brightnesse, and to reduce the power of the back light. The invention describes a method for combining the filter function, with the polarization function on the same substrate, resulting in improved yield, improved color quality, reduced cost, and increased polarization efficiency, approaching 100% in the transmission mode. The new method comprises a periodic stack of laminates each of which has a reflector layer on one side of a clear glass substrate, and a polarizing filter layer on the other side of the substrate. Each period consists of red, green and blue filters. The laminates are bonded together and sliced at 45 degree angle. Each slice is polished on both sides to obtain an optical finish and thus becomes polarizing filter array for use as the starting material for fabricating liquid crystal displays.

Dependencies are inferred from the claim text.