Patent Number: 6,297,596

Title: Power supply circuit arranged to generate intermediate voltage and liquid crystal display device including power supply circuit

Abstract: A power supply circuit includes a reference voltage generation circuit to generate reference voltages, an operational amplifier to receive a first reference voltage and an intermediate voltage, an operational amplifier to receive a second reference voltage and the intermediate voltage, an output buffer which includes a pair of transistors controlled to turn on/off according to outputs of the two operational amplifiers and generates the intermediate voltage, and a through current prevention circuit to prevent a through current supplied to the pair of transistors in the output buffer. The through current prevention circuit operates to turn off one of the pair of transistors when the other turns on. Thus, the through current in the pair of transistors can be prevented.

Inventors: Kajihara; Noriyuki (Nara, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: G05F 3/08 (20060101); G05F 3/24 (20060101); G05F 001/10 ()

Expiration Date: 10/02/2018