Patent ID: 6219016
Filing Date: 2001-04-17
Classification: G09G

Abstract:
A liquid crystal display power supply that generates digital circuit power supply voltages, gray voltages and gate ON and OFF voltages for a liquid crystal display, the power supply comprising:at least one DC-to-DC converter that is responsive to a single DC input power supply voltage to generate at least one digital circuit power supply voltage that supplies power to digital circuits of the liquid crystal display and to generate a gray voltage generator power supply voltage;a gray voltage generator that is powered by the gray voltage generator power supply voltage to generate gray voltages for the liquid crystal display;a gate voltage generator that is responsive to the gray voltage generator power supply voltage, to generate gate ON and OFF voltages for the liquid crystal display from the single DC input power supply voltage; anda switch that is connected between the single DC input power supply voltage, the gate voltage generator and the gray voltage generator power supply voltage, to supply the single DC input power supply voltage to the gate voltage generator in response to the gray voltage generator power supply voltage.