Variable color complementary display device using anti-parallel light emitting diodes

DETAILED DESCRIPTION In a broad sense, it is the principal object of this invention to provide an improved variable color complementary display device.
It is another object of the invention to provide a variable color display device having improved readability of the exhibited display unit.
It is still another object of the invention to provide a variable color display device in which the display unit, exhibited in a selective color, is enhanced by a substantially complementary or otherwise contrasting color.
It is still another object of the invention to provide a variable color complementary display device for illuminating certain display areas in a selected color, and for automatically illuminating the remaining display areas in a color substantially complementary, without the need for converting the color control signals.
It is still another object of the invention to provide a variable color complementary display device using the pairs of anti-parallel (back-to-back connected) light emitting diodes of respective primary colors, the light emitting diodes in each pair being of the same color.
It is still another object of the invention to provide a variable color complementary display device including a decoder for developing output signals for illuminating the light emitting diodes in certain display areas in a display color, and for developing opposite output signals for illuminating the light emitting diodes in the remaining display areas in a complementary, or otherwise contrasting, color to the display color.
In summary, a variable color complementary display device of the invention 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 of the same color