Stacked backlighting system using microprisms
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United States of America Patent
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Jul 20, 1999
Grant Date -
N/A
app pub date -
May 2, 1996
filing date -
May 2, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An assembly backlighting a liquid crystal flat panel display or other such arrangement requiring backlighting is disclosed herein. The assembly includes a plurality of light pipes and is capable of a multi-mode operation as well as achieving an enhanced dimming. This assembly is composed of two or more light pipes placed in a stacked configuration. Each light pipe has a set of specially configured microprisms which, cooperating with the light pipe, provides an efficient backlighting technique with a controllable degree of collimation. The disclosed assembly is particularly useful for displays which require a very bright backlighting, a wide dimming range and which must be capable of illuminating a given active area with light of different spectra.
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