A circuit for generating a screen voltage is provided. The circuit employs an operational amplifier and two NPN transistors and receives an analog control signal from a microprocessor. The analog control signal is input to the negative input terminal of the operational amplifier. The output screen voltage is taken at emitter of one NPN transistor. In one preferred embodiment, Vcc is taken at a primary side of a high voltage transformer within the display device and input to the collector of the one NPN transistor.
This is a continuation-in-part of U.S. patent application Ser. No. 08/645,384, filed May 13, 1996 of Chang-Fa HSIESH for MICROPROCESSOR-CONTROLLED SCREEN VOLTAGE GENERATION CIRCUIT, now abandoned .
