公开(公告)号：AU2002343420A1

公开(公告)日：2003-04-07

申请号：AU2002343420

申请日：2002-09-24

Applicant: CANDESCENT INTELLECTUAL PROP

Inventor： FRIEDMAN JAY ,  HANSEN RONALD L

IPC: G09G3/20 ,  G09G3/22

Abstract: The present invention provides a method and circuit to efficiently change a present column voltage output level to a desired next column voltage output level using digital control circuitry. In one embodiment, the present column voltage output level at an intersection of an active row line and a column line is stored. In substantially the same time, a desired next column voltage level is received for the next row data line of the same column line. The difference between the present column voltage and the desired next voltage is determined and digitized. The digitized voltage difference is translated to a clock time necessary to apply a high current to column driver to attain the desired next column voltage level. The circuit providing high current is active only for the clock time. In this way, bias current and power dissipation are maintained at a low level during quiescent conditions. A quiescent current is continuously applied to all pixels for maintaining their gray cale levels thus compensating for leakage current.