Patent ID: 6201523
Filing Date: 2001-03-13
Classification: G09G

Abstract:
A flat panel display device comprising:a display panel having display pixels each of which includes a pixel electrode, an opposing electrode, and an optical modulation layer interposed between these electrodes;a first D/A converter circuit for receiving a first digital video signal, a clock signal, a first voltage, and a second voltage lower than the first voltage, and converting the first digital video signal into a first analog video signal based on the clock signal;a second D/A converter circuit for receiving a second digital video signal, the clock signal, the second voltage, and a third voltage lower than the second voltage, and converting the second digital video signal into a second analog video signal based on the clock signal;a driving control portion for outputting the first and second digital video signals and the clock signal to the first D/A converter circuit and the second D/A converter circuit; anda driving circuit portion for outputting signal voltages to respective pixel electrodes in the display panel based on the first analog video signal and the second analog video signal;wherein the first D/A converter circuit and the second D/A converter circuit have a same circuit configuration which includes a clock monitoring portion for monitoring the clock signal, and an output selector portion for setting both the first analog video signal and the second analog video signal to a predetermined voltage based on an output of the clock monitoring portion.