05339179 is referenced by 216 patents and cites 12 patents.

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.

Title
Edge-lit transflective non-emissive display with angled interface means on both sides of light conducting panel
Application Number
7/955524
Publication Number
5339179
Application Date
October 1, 1992
Publication Date
August 16, 1994
Inventor
Daniel J Whittle
Apex
NC, US
Charles A Rudisill
Apex
NC, US
Agent
Edward H Duffield
John J Timar
Assignee
International Business Machines
NY, US
IPC
G02B 6/00
F21V 7/04
G02F 1/1335
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