Patent ID: 6456268
Filing Date: 2002-09-24
Classification: G09G

Abstract:
An active matrix type liquid crystal display drive control apparatus for an active matrix type liquid crystal display comprising:a first substrate having display pixel electrodes and thin film transistors, each arranged at one of orthogonal intersections of a plurality of gate lines and a plurality of drain lines, wherein sources of the thin film transistors are connected to the display pixel electrodes, and a second substrate having a common electrode and arranged so as to oppose to the first substrate via a liquid crystal layer, the drive control apparatus comprising: a frequency detection circuit for detecting a horizontal sync frequency, a gate-on voltage changing circuit for changing a gate-on voltage of the thin film transistors according to the horizontal sync frequency detected by the frequency detection circuit, and a common voltage changing circuit for changing a common voltage of the common electrode according to the horizontal sync frequency detected by the frequency detection circuit.