Liquid-crystal display apparatus and driving method
AssigneeSharp Display Technology Corporation
InventorOsamu Sasaki
Life of this patent
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Abstract
Multiple adjustment capacitors corresponding to multiple source bus lines on a one-to-one correspondence basis are arranged. Each adjustment capacitor includes a first electrode supplied with an adjustment signal and a second electrode connected to the source bus line. The adjustment capacitors are divided into multiple groups. An adjustment signal having a amplitude different from group to group is supplied to the adjustment capacitor. A potential of the adjustment signal is raised after a liquid-crystal capacitor is charged in a pixel formation region including a thin-film transistor (TFT) that is turned on with a gate driver causing a scanning signal to rise and before the gate driver causes the scanning signal to fall.
Claims7
A liquid-crystal display apparatus having a display including a plurality of video signal lines, a plurality of scanning signal lines intersecting the video signal lines, and a plurality of pixel formation regions that are arranged at intersection points where the video signal lines and the scanning signal lines intersect each other, the liquid-crystal display apparatus comprising:
- a video signal line driving circuit that applies a video signal to the video signal lines;
- a scanning signal line driving circuit that applies a scanning signal to the scanning signal lines;
- a common electrode that is supplied with a constant potential;
- a plurality of adjustment capacitors that respectively correspond to the video signal lines on a one-to-one correspondence basis;
- and
- an adjustment signal output circuit that outputs a plurality of adjustment signals that are different from each other in amplitude;
- wherein
- each of the pixel formation regions includes:
- a pixel electrode;
- a pixel transistor that includes a control terminal connected to a corresponding scanning signal line, a first conductive terminal connected to a corresponding video signal line, and a second conductive terminal connected to the pixel electrode;
- and
- a liquid-crystal capacitor that is created by the pixel electrode and the common electrode;
- each of the adjustment capacitors includes:
- a first electrode;
- and
- a second electrode connected to a corresponding video signal line;
- a potential of the first electrode is raised after the liquid-crystal capacitor is charged with the video signal applied to the video signal line corresponding to the pixel formation region including the pixel transistor that transitions into an on-state in response to a rise of the scanning signal caused by the scanning signal line driving circuit and before the scanning signal line driving circuit causes the scanning signal to fall;
- the adjustment capacitors are equal to each other in capacitance value;
- the adjustment capacitors are divided into a plurality of groups;
- the groups respectively correspond to the adjustment signals on a one-to-one correspondence basis;
- the first electrode of the adjustment capacitor forming each of the groups is supplied with a corresponding adjustment signal;
- and
- the amplitude of each of the adjustment signals is larger as a distance between the video signal line connected to the second electrode of the adjustment capacitor forming a corresponding group and the scanning signal line driving circuit is shorter.
A liquid-crystal display apparatus having a display including a plurality of video signal lines, a plurality of scanning signal lines intersecting the video signal lines, and a plurality of pixel formation regions that are arranged at intersection points where the video signal lines and the scanning signal lines intersect each other, the liquid-crystal display apparatus comprising:
- a video signal line driving circuit that applies a video signal to the video signal lines;
- a scanning signal line driving circuit that applies a scanning signal to the scanning signal lines;
- a common electrode that is supplied with a constant potential;
- a plurality of adjustment capacitors that respectively correspond to the video signal lines on a one-to-one correspondence basis;
- and
- an adjustment signal output circuit that outputs a plurality of adjustment signals that are different from each other in amplitude;
- wherein
- each of the pixel formation regions includes:
- a pixel electrode;
- a pixel transistor that includes a control terminal connected to a corresponding scanning signal line, a first conductive terminal connected to a corresponding video signal line, and a second conductive terminal connected to the pixel electrode;
- and
- a liquid-crystal capacitor that is created by the pixel electrode and the common electrode;
- each of the adjustment capacitors includes:
- a first electrode;
- and
- a second electrode connected to a corresponding video signal line;
- a potential of the first electrode is raised after the liquid-crystal capacitor is charged with the video signal applied to the video signal line corresponding to the pixel formation region including the pixel transistor that transitions into an on-state in response to a rise of the scanning signal caused by the scanning signal line driving circuit and before the scanning signal line driving circuit causes the scanning signal to fall;
- the adjustment capacitors are equal to each other in capacitance value;
- the adjustment capacitors are divided into a plurality of groups;
- the groups respectively correspond to the adjustment signals on a one-to-one correspondence basis;
- the first electrode of the adjustment capacitor forming each of the groups is supplied with a corresponding adjustment signal;
- the adjustment signals include at least a first adjustment signal and a second adjustment signal;
- a plurality of horizontal scanning periods forming a vertical scanning period include a first-type horizontal scanning period throughout which the adjustment signal output circuit equalizes the amplitude of the first adjustment signal and the amplitude of the second adjustment signal and a second-type horizontal scanning period throughout which the adjustment signal output circuit differentiates the amplitude of the first adjustment signal from the amplitude of the second adjustment signal;
- and
- the adjustment signal output circuit equalizes the amplitude of the first adjustment signal during the first-type horizontal scanning period and the amplitude of the first adjustment signal during the second-type horizontal scanning period and differentiates the amplitude of the second adjustment signal during the first-type horizontal scanning period from the amplitude of the second adjustment signal during the second-type horizontal scanning period.
Dependencies are inferred from the claim text.