×

Method for setting transistor operating point and circuit therefor, method for changing signal component value and active-matrix liquid crystal display device

  • US 8,625,038 B2
  • Filed: 06/04/2002
  • Issued: 01/07/2014
  • Est. Priority Date: 06/04/2001
  • Status: Active Grant
First Claim
Patent Images

1. An active-matrix liquid crystal display device comprising:

  • a plurality of scan lines configured for providing a scan voltage;

    a plurality of signal lines crossing the scan lines configured for providing a data signal; and

    a plurality of pixel circuit positioned the neighborhood of each of the cross points of scan lines and signal lines, each pixel circuit comprising;

    a first transistor comprising a gate connected to one of the scan lines, a source connected to one of the signal lines, and a drain;

    a second transistor comprising a gate connected to the drain of the first transistor, a source connected to the gate of the first transistor, and a drain connected to said liquid crystal; and

    a third transistor comprising a source connected to the drain of the second transistor, a gate configured for receiving a first voltage, and a drain configured for receiving a second voltage,wherein the second transistor provides the data signal to the second transistor on the basis of the scan voltage of the scan line, the second transistor provides a pixel voltage to the liquid crystal according to the received data signal, said liquid crystal displays images corresponding to the pixel voltage, a drain current of the second transistor is substantially constant even when the source-drain voltage of the first transistor is varied.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×