Patent ID: 6040815
Filing Date: 2000-03-21
Classification: G09G

Abstract:
A column-driver integrated circuit for generating output voltages to be applied to the columns of an LCD display, such output voltages falling within either an upper voltage range or a lower voltage range, said column-driver integrated circuit comprising in combination:a. a first digital-to-analog converter circuit having a plurality of input terminals for receiving a first digital data word corresponding to a voltage within the upper voltage range, said first digital-to-analog converter circuit including a first analog voltage terminal for providing a first analog voltage signal within the upper voltage range;b. a second digital-to-analog converter circuit having a plurality of input terminals for receiving a second digital data word corresponding to a voltage within the lower voltage range, said second digital-to-analog converter circuit including a second analog voltage terminal for providing a second analog voltage signal within the lower voltage range;c. a first column output terminal for providing an analog output voltage to drive a first column within the LCD display;d. a second column output terminal for providing an analog output voltage to drive a second column within the LCD display; ande. analog multiplexer circuitry coupled to said first and second analog voltage terminals for receiving the first and second analog voltage signals, said analog multiplexer circuitry also being coupled to said first and second column output terminals, said analog multiplexer circuitry transmitting, during a first column driving cycle, the first analog voltage signal to said first column output terminal and the second analog voltage signal to said second column output terminal, and said analog multiplexer circuitry transmitting, during a second column driving cycle, the second analog voltage signal to said first column output terminal.