Patent ID: 7746302
Filing Date: 2010-06-29
Classification: G09G

Abstract:
1. A reference voltage generating circuit for an LCD device, comprising: a main pumping section; a sub-pumping section; an input section inputting a level designating signal periodically and alternately designating a first reference level and a second reference level; and a control section alternately comparing an output voltage with the first and second reference levels in response to the level designating signal, wherein the control section outputs a first logic level and the main pumping section selectively lowers the output voltage in a fast negative pumping and the sub-pumping section selectively raises the output voltage in a slower positive pumping, wherein the control section outputs a second logic level and the main pumping section selectively raises the output voltage in a fast positive pumping and the sub-pumping section selectively lowers the output voltage in a slower negative pumping, wherein one of the fast positive pumping and fast negative pumping is selectively performed when the output voltage has a level in a range between the first reference level and the second reference level.