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Liquid crystal display device and method for driving the same

  • US 5,784,042 A
  • Filed: 01/05/1995
  • Issued: 07/21/1998
  • Est. Priority Date: 03/19/1991
  • Status: Expired due to Term
First Claim
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1. A method for driving a liquid crystal display device, the liquid crystal display device includinga liquid crystal pixel, anda thin film transistor having a source, a drain, and a gate, the source of the thin film transistor being coupled to the liquid crystal pixel,the method comprising the steps of:

  • applying a drain voltage indicative of a video signal to the drain of the thin film transistor, the drain voltage having a first drain voltage value at a first time;

    applying a gate voltage pulse to the gate of the thin film transistor, the gate voltage pulse being a gate voltage which changes from a first gate voltage value to a second gate voltage value at a second time after the first time, and changes from the second gate voltage value to the first gate voltage value at a third time after the second time, the first gate voltage value being effective for turning the thin film transistor off, the second gate voltage value being effective for turning the thin film transistor on; and

    changing the drain voltage from the first drain voltage value to a second drain voltage value at one of a fourth time and a fifth time, the fifth time being after the fourth time, the fourth time and the fifth time each being not before the second time and not after than the third time, the first drain voltage value and the second drain voltage value each being between the first gate voltage value and the second gate voltage value;

    wherein the drain voltage is changed from the first drain voltage value to the second drain voltage value at the fourth time if a difference between the second gate voltage value and the second drain voltage value is less than a difference between the second gate voltage value and the first drain voltage value, and is changed from the first drain voltage value to the second drain voltage value at the fifth time if the difference between the second gate voltage value and the second drain voltage value is greater than the difference between the second gate voltage value and the first drain voltage value.

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