Method of manufacturing cholesteric liquid crystal (CLC) color filter layer and transmissive liquid crystal display device having the CLC color filter layer according to the method
View Patent ↗A transmissive liquid crystal display device includes first and second substrates spaced apart and facing each other, a cholesteric liquid crystal (CLC) color filter layer on an inner surface of the first substrate, the CLC color filter layer including first areas for displaying R, G and B and second areas between adjacent first areas, a first polarizer on an outer surface of the first substrate, a backlight unit on the first polarizer, a retardation plate on an outer surface of the second substrate, a second polarizer on the retardation plate, and a liquid crystal layer between the first and second substrates.
1. A manufacturing method of a cholesteric liquid crystal (CLC) color filter layer for a transmissive liquid crystal display device, comprising:
coating a CLC material on a substrate, the CLC material including ultraviolet (UV) absorbent;
disposing a mask over the CLC material and exposing the CLC material to UV light, the UV light having different intensities corresponding to portions of the mask, each portion of the mask including a plurality of transmissive areas and a plurality of half transmissive areas alternatively arranged;
forming a CLC color filter layer including R, G and B sub pixels according to the intensities of the UV light, each sub pixel having a plurality of first areas displaying and a plurality of second areas reflecting all R, G and B light,
wherein the CLC color filter layer includes a first CLC layer and a second CLC layer, which have respective pitches reflecting different colors such that a color of emitted light is different from the reflected colors, and
wherein each first area of the CLC color filter has a width and a thickness such that a triangle made by the width and the thickness has an angle adjacent to the thickness side of the triangle within a range of about 10 degrees to about 15 degrees.