Variable color complementary display device using anti-parallel light emitting diodes
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United States of America Patent
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Jul 2, 2002
Grant Date -
N/A
app pub date -
Oct 12, 1999
filing date -
Oct 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A variable color complementary display device includes a plurality of display areas arranged in a pattern for selectively exhibiting a plurality of display units. Each display area includes a plurality of pairs of light emitting diodes for emitting, when forwardly biased, light signals of respective primary colors and a device for combining the light signals in the display area to obtain a light signal of a composite color. Each pair includes a first light emitting diode and a second light emitting diode, both of the same color, connected in an anti-parallel fashion such that their polarities are opposite. A device is provided for selectively forwardly biasing the first light emitting diodes, for illuminating certain of the display areas in a display color. The second light emitting diodes in the remaining display areas are automatically illuminated in a complementary color.
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