Optical element for lateral light spreading in edge-lit displays and system using same
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United States of America Patent
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Sep 20, 2011
Grant Date -
Dec 28, 2006
app pub date -
Jun 24, 2005
filing date -
Jun 24, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An illumination light unit has at least one light source that generates illumination light. The unit also includes a reflecting cavity having one or more reflectors and a controlled transmission mirror disposed at an output of the reflecting cavity. The controlled transmission mirror includes an input coupling element, an output coupling element and a first multilayer reflector disposed between the input and output coupling elements. At least some of the illumination light is reflected within the reflecting cavity by the one or more reflectors and is transmitted out of the reflecting cavity through the controlled transmission mirror. The illumination light unit may be used for generating light for space lighting, or for illuminating a display. For example, the unit may be used in a backlight to illuminate a lightguide placed behind a display panel.
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