Prismatic refracting optical array for liquid flat panel crystal display backlight
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United States of America Patent
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Nov 26, 1996
Grant Date -
N/A
app pub date -
Nov 30, 1994
filing date -
Nov 30, 1994
priority date (Note) -
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Abstract
A prismatic refracting array for a flat panel liquid crystal display (LCD) backlighting device matches a prismatic angle with the critical angle of the exit window and surrounding material, e.g., glass and air. By selecting the prism angle of the refracting array with reference to the critical angle of the exit window and surrounding air, light lost to total internal reflectance within the exit window is substantially eliminated while directing all light output within selected view angles. By better utilizing the available light output from the flat panel backlight device, overall efficiency of the LCD device is improved.
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