US 2006/0232542 A1 · Liquid crystal panel driving device

Abstract

A switching-controlling section turns ON one of a transfer gate for high voltages or a transfer gate for low voltages and subsequently turns ON the other one of the transfer gates according to the outputs from the data latches only when the outputs from data latches are different from each other. Source lines are sequentially connected to a capacitor element for high voltages or a capacitor element for low voltages. For those source lines in which applied voltages change in a previous period and a subsequent period, an electric charge is stored and supplied effectively and power consumption is reduced, whereas for those source lines in which the applied voltages do not change, retained voltages do not vary so power is not consumed when subsequent voltages are applied. Power consumption in a liquid crystal panel driving device is reduced, and the time required for storing and supplying an electric charge is shortened. The circuit scale is also reduced.

Claims15

Dependent claims

A liquid crystal panel driving device for a liquid crystal display device comprising source lines, pixel switches, pixel electrodes connected to the source lines through the pixel switches, and an opposing electrode opposed to the pixel electrodes, the liquid crystal panel driving device alternately applying to the pixel electrodes through the source lines high voltages and low voltages that are respectively higher and lower than a predetermined voltage, both of the voltages corresponding to image data for pixels, the liquid crystal panel driving device comprising:

a charge-storing means for storing an electric charge;
a charge-storing means-connecting means for connecting and disconnecting the source lines and the storing means;
an opposing electrode-connecting means for connecting and disconnecting the source lines and the opposing electrode;
and
a controlling means for controlling the charge-storing means-connecting means and the opposing electrode-connecting means such that, after applying one of the high voltage and the low voltage to a set of the pixel electrodes but before applying the other one of the voltages to a subsequent set of the pixel electrodes, the source lines are connected to the electric charge-storing means and subsequently the source lines are connected to the opposing electrode.

2 more elements

A liquid crystal panel driving device for a liquid crystal display device comprising source lines, pixel switches, pixel electrodes connected to the source lines through the pixel switches, and an opposing electrode opposed to the pixel electrodes, the liquid crystal panel driving device applying to the pixel electrodes voltages corresponding to image data for pixels through the source lines, the liquid crystal panel driving device comprising:

a charge-utilizing means for utilizing an electric charge of the source lines;
a charge-utilizing means-connecting means for connecting and disconnecting the source lines and the charge-utilizing means;
and
a controlling means for controlling the charge-utilizing means-connecting means based on at least one of the first voltage and the second voltage after applying a first voltage to a previous set of the pixel electrodes but before applying a second voltage to a subsequent set of the pixel electrodes.

1 more element

Dependencies are inferred from the claim text.

Liquid crystal panel driving device

Life of this patent

Liquid crystal panel driving device

Life of this patent

Abstract

Claims15