Display device using ambient light a lighting panel
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United States of America Patent
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Apr 29, 2003
Grant Date -
N/A
app pub date -
Apr 27, 1999
filing date -
Apr 30, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A display device includes a non light-emitting type display element for controlling the transmission of incident light to display an image, a light radiating unit having a light source and a photoconductor, and arranged at the back of the display element for emitting illuminating light toward the display element and reflecting ambient light incident from the front of the display element at a given reflectivity toward the display element. An illumination brightness controller is provided for controlling the intensity of the illuminating light so that the screen brightness of the display element comprising the total of reflected light of the ambient light reflected on the photoconductor and transmitted light of the illuminating light is set up into a predetermined range according to the reflectivity of the photoconductor and the environmental illumination of the ambient light radiated from the front of the display element.
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