Patent ID: 6191779
Filing Date: 2001-02-20
Classification: G09G

Abstract:
A device for controlling a liquid crystal display device comprising:a digital control circuit for receiving a first voltage and a second voltage higher than the first voltage as reference voltages and having a plurality of outputs, each output providing a plurality of bits of digital image data in parallel and in response to said reference voltages;a plurality of capacitors, each capacitor having a first terminal coupled to the corresponding one of said plurality of outputs of said digital control circuit for receiving said plurality of digital image data and having a second terminal;a plurality of charging controllers, each charging controller having an input terminal coupled to the second terminal of a corresponding one of said capacitors and having an output terminal; anda digital-to-analog (D/A) converter coupled to the output terminal of each said charging controller, said D/A converter receiving a fourth voltage and a fifth voltage higher than the fourth voltage as reference voltages and outputting an analog voltage to an external liquid crystal panel,wherein after data is outputted from said charging controller, each second terminal of said capacitors is charged to a third voltage, charging is stopped in order to set each of the second terminals of said capacitors to a floating state, and said digital image data are outputted from the digital control circuit.