| 摘要 |
PURPOSE:To extremely decrease the number of wirings in comparison with a conventional voltage control means by using a D/A converter containing plural channels as a reference voltage supply means which supplies the reference voltage to each type of voltage generator that outputs the multi-step voltage in a picture producing device. CONSTITUTION:A D/A converter 1 of plural channels contains a D/A converting circuit incorporating plural channels that can control individually the output voltage values for each channel via a digital signal of the prescribed number of bits. The control lines required in number equal to the number of bits becomes a control signal of the prescribed number of bits is used for control. However, the voltage generators 4-6 can be connected with each other via a single piece of wiring because the output is outputted from a single output terminal per channel. Thus it is not required to perform wiring jobs carried out conventionally for each voltage generator in response to the number of switching steps of the output voltage. |
