05050946 is referenced by 259 patents and cites 11 patents.

A light pipe used for backlighting liquid crystal displays has a planar front surface and a stairstepped or faceted back surface. Light is injected from the ends of the light pipe from cold or hot cathode, apertured, fluorescent lamps. The cold cathode lamps are preferably insulated to raise their operating temperature. The back surface has a series of planar portions parallel to the front surface connected by facets, which are angled so that the injected light reflects off the facets and through the front surface. A reflector having a planar, highly reflective, highly scattering surface or a sawtoothed or grooved upper surface is located adjacent to and parallel with the light pipe back surface to reflect light escaping from the back surface back through the light pipe to exit the front surface. The axis of grooves is preferably slightly skewed from the facet axis to reduce moire pattern development. A low scattering or loss diffuser is located adjacent to and parallel with the light pipe front surface to reduce moire pattern development. The liquid crystal display is located over the low scattering diffuser. A separate injector may be located between the lamp and the light pipe to better couple the light into the light pipe.

Title
Faceted light pipe
Application Number
7/589325
Publication Number
5050946
Application Date
September 27, 1990
Publication Date
September 24, 1991
Inventor
Gaylon R Kornfuerhrer
Cypress
TX, US
Douglas A Arego
Spring
TX, US
Richard M Knox Jr
Houston
TX, US
Kevin J Hathaway
San Jose
CA, US
Agent
Pravel Gambrell Hewitt Kimball & Krieger
Assignee
Compaq Computer Corporation
TX, US
IPC
G02B 6/00
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