Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-10-01
1994-08-16
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 48, 362 31, 385901, G02F 11335, F21V 704, G02B 600
Patent
active
053391799
ABSTRACT:
A transflective liquid crystal display (LCD) uses the reflective and refractive characteristics of an edge-lit flat light pipe as a backlight panel behind the liquid crystal layer. The front and/or back surfaces of the edge-lit backlight panel are textured to enhance reflectivity of ambient light and transmission of edge light. The front surface of the panel is textured with pits that have walls at an angle to enhance reflectivity over a range of viewing angles. Further, the back surface of the panel is textured with pits having wall angles, and a pattern to enhance the uniform reflection of edge light toward and through the front surface of the backlight panel. The indentations may be conical, triangular or random. The pit wall angles lie within a preferred range of angles to optimize the amount of light within the useable viewing angle for the LCD. Alternative embodiments include backlight panel where only the front surface has indentations and the back surface is flat and mirrored, or where only the back surface of the panel has indentations and the front surface is flat.
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K. J. Hathaway et al, "New Backlighting Technologies for LCDs", SID 91 Digest (May 1991), pp. 751-754.
Rudisill Charles A.
Whittle Daniel J.
Duffield Edward H.
Gross Anita P.
International Business Machines Corp.
Timar John J.
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