Light panel with improved diffraction
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United States of America Patent
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Aug 10, 2004
Grant Date -
N/A
app pub date -
Nov 27, 2001
filing date -
May 28, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A light panel that includes a light source and a panel element operatively connected to the light source. The panel element includes a substantially transparent light transmitting material and is operative as a waveguide panel inside which light beams received from the light source propagate with total reflection. A diffractive outcoupling system is arranged on the panel element over a light surface of the panel element and is operative to outcouple the light beams from inside the panel element. The diffractive outcoupling system includes a plurality of local grating elements. The local grating elements have a plurality configurations and are optimized such that a diffraction efficiency is a function of location.
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