US 7,403,186 B2 · Charge characteristic compensating circuit for liquid crystal display panel

Abstract

A charge characteristic compensating circuit for a liquid crystal display panel for maintaining a charge characteristic of the liquid crystal display panel independently of ambient temperature change to prevent deterioration of images displayed. A plurality of liquid crystal cells control light transmission in response to data signals from the data lines. A plurality of thin film transistors switch the data signals from the data lines to the liquid crystal cells in response to signals on the gate lines. A voltage supply generates a gate voltage required for the gate lines. A gate line driver applies the gate voltage from the voltage supply to the gate lines to drive the gate lines. A gate line controller responds to a change in the ambient temperature to vary a controlling signal applied to the gate line driver.

Claims18

Dependent claims

A charge characteristic compensating circuit for a liquid crystal display panel (LCD), comprising:

a voltage converter generating a high level gate voltage;
a gate line controller including a resistor and a thermistor for receiving said high level gate voltage from said voltage converter and supplying a controlling signal that varies as an ambient temperature varies;
and
a gate line driver receiving said controlling signal from said gate line controller and supplying to a gate line a voltage varied according to the controlling signal to drive a gate line, thereby reducing a width of a current path from a data line to a liquid crystal cell at each intersection between said data line and said gate line as said ambient temperature increases and widening said with of said current path from said data line to said liquid crystal cell as said ambient temperature decreases;
wherein said gate line controller connects between said voltage converter and said gate line driver.

2 more elements

Dependencies are inferred from the claim text.

Charge characteristic compensating circuit for liquid crystal display panel

Life of this patent

Charge characteristic compensating circuit for liquid crystal display panel

Life of this patent

Abstract

Claims18