Liquid-crystal display panel drive power supply circuit
AssigneeNEC Corporation
InventorKIYOSHI MIYAZAKI
Life of this patent
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Abstract
In a liquid-crystal display panel drive power supply circuit that has a first power supply of a high potential, a second powers supply of a potential that is lower than that of the first power supply, a plurality of resistors that are provided in series between the first and second power supplies, and a plurality of voltage-follower configured amplifiers for the purpose of introducing mutually different voltages present at the connection points between the resistors to a liquid-crystal panel, capacitors are inserted between the output terminals of the amplifiers and the second power supply.
Claims7
A liquid-crystal display panel drive power supply circuit comprising a first power supply of a high potential, a second power supply of a potential that is lower than said potential of said first power supply, a plurality of voltage-dividing resistors provided in series between said first power supply and second power supply, and a plurality of voltage-follower configured amplifiers for introducing a plurality of differing voltages from connection points between said resistors to a liquid-crystal display panel, wherein said liquid-crystal display panel powers supply circuit further comprising a capacitor that is connected between an output terminal of each of said amplifiers and said second power supply.
A method of reducing the current consumption of a liquid-crystal display panel drive power supply circuit comprising a first power supply of a high potential, a second power supply of a potential that is lower than said potential of said first power supply, a plurality of voltage-dividing resistors provided in series between said first power supply and second power supply, and a plurality of voltage-follower configured amplifiers for introducing a plurality of differing voltages from connection points between said resistors to a liquid-crystal display panel, wherein a capacitor is connected between an output terminal of said amplifiers and said second power supply, a charge that is temporarily stored in said capacitor is re-used as the power supply of another amplifier of said amplifiers, thereby reducing the power consumption.
Dependencies are inferred from the claim text.