Patent ID: 7250891
Filing Date: 2007-07-31
Classification: G09G

Abstract:
1. A gray scale voltage generating circuit comprising: a first resistor ladder circuit for outputting first to n'th reference voltages from n nodes thereof, n being an even number, said n nodes being arranged between a high voltage power supply terminal and a low voltage power supply terminal; a second resistor ladder circuit including n nodes arranged between an output terminal of a constant voltage generating circuit and said low voltage power supply terminal; first to n'th voltage follower circuits respectively arranged between said n nodes of said second resistor ladder circuit and corresponding ones of said n nodes of said first resistor ladder circuit; a first resistor connected between a n/2'th node as counted from the low voltage power supply terminal side of said first resistor ladder circuit and said high voltage power supply terminal; and a second resistor connected between a n/2+1'th node as counted from the low voltage power supply terminal side of said first resistor ladder circuit and said low voltage power supply terminal.