Drive voltage generator

摘要

N drivers convert n digital values into n voltages. N amplifiers amplify the n voltages, thereby generate n drive voltages. An amplifier voltage supply supplies an amplifier voltage for driving the n amplifiers. An amplifier voltage controller detects a maximum digital value among a plurality of digital values, and sets the amplifier voltage to a voltage value dependent on the maximum digital value.

主权项

1. A drive voltage generator which periodically receives n (where n≧2) digital values, and generates n drive voltages corresponding to the n digital values, comprising:
n drivers corresponding to the n digital values; n amplifiers corresponding to the n drivers; an amplifier voltage supply; and an amplifier voltage controller, wherein each of the n drivers converts a digital value corresponding to that driver into a voltage, each of the n amplifiers amplifies a voltage obtained by a driver corresponding to that amplifier, thereby generates one of the drive voltages, the amplifier voltage supply supplies an amplifier voltage for driving the n amplifiers, and the amplifier voltage controller detects a maximum digital value among n·q (where q≧1) digital values supplied to the drive voltage generator, and sets the amplifier voltage supplied by the amplifier voltage supply to a voltage value dependent on the maximum digital value, the drive voltage generator further comprising: a reference voltage supply configured to supply a reference voltage; a gradation voltage generator configured to generate a plurality of gradation voltages different from one another based on the reference voltage supplied by the reference voltage supply; a reference voltage controller configured to detect a maximum digital value among n·r (where r≧1) digital values supplied to the drive voltage generator, and to set the reference voltage supplied by the reference voltage supply to a voltage value dependent on the maximum digital value; and a data processor configured to process the n·r digital values based on a ratio between a voltage value of the reference voltage set by the reference voltage controller and a predetermined reference voltage value, and to supply processed n·r digital values to the n drivers, wherein each of the n drivers selects one gradation voltage from the plurality of gradation voltages based on a digital value corresponding to that driver.