Patent ID: 6977634
Filing Date: 2005-12-20
Classification: G09G

Abstract:
1. An apparatus for driving an image display device, the apparatus comprising: a digital-to analog (D/A) converter converting digital pixel data into an analog pixel signal in units of single pixels, wherein the digital pixel data is pulse width modulated; a pixel driving unit connected to the D/A converter and receiving the analog pixel signal output from the D/A converter, switching the analog pixel signal to charge a first charging device with the analog pixel signal, switching a signal charged in the first charging device per frame to charge a second charging device with the signal charged in the first charging device, and discharging a signal for a previous frame, which is charged in the second charging device, before charging the second charging device with a signal for a current frame; and a liquid crystal cell connected to said pixel driving unit and displaying an image using a difference between voltage of the pixel signal in the second charging device and a predetermined AC driving voltage, wherein the D/A converter comprises a first switching unit switching and outputting a current from a current source in response to the digital pixel data having a modulated pulse width, a first capacitor charging a signal output from the first switching unit, and a second switching unit being connected in parallel to the first capacitor and discharging from the first capacitor the pixel signal charged with the pixel signal of a previous line before charging the first capacitor with the pixel signal for a current line.