US 6,249,325 B1Granted

Having a pattern for improving voltage difference between different pixel electrodes in which semiconductive or signal line portion is larger for a more remote pixel

AssigneeHitach, Ltd.

InventorsHiroshi Ohkawara, Takanori Nakayama, Takeshi Tanaka, Hikaru Itoh, Tatsuo Kamei, Tetsuya Kawamura, Masataka Natori, Hidetaka Hakoda

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Abstract

A liquid crystal display device has gate signal lines extending in the x-direction and arranged in the y-direction, and drain signal lines extending in the y-direction and arranged in the x-direction on the surface of the liquid crystal side of the one transparent substrate between a pair of transparent substrates opposed to each other via liquid crystals. A thin-film transistor is fumed on by a scanning signal from a gate signal line, and a pixel electrode will be supplied with a video signal from the drain signal line via the thin-film transistor that is fumed on in each of the regions surrounded by the signal lines. The thin-film transistor is of the MIS type, and the capacity between the gate electrode and the source electrode thereof is small on the input terminal side of the gate signal line and increases in a direction toward the end of the gate signal line, thereby to suppress the occurrence of flickering.

Claims11

Dependent claims

A liquid crystal display device comprising:

a gate signal line formed on a first insulating substrate;
a drive circuit electrically connected to said gate signal line to produce a gate drive voltage;
first and second thin-film transistors each having a source electrode, a gate electrode and a drain electrode;
a first pixel electrode electrically connected to either the source electrode or the drain electrode of said first thin-film transistor;
a second pixel electrode electrically connected to either the source electrode or the drain electrode of said second thin-film transistor;
a first video signal line electrically connected to the other one of the source electrode or the drain electrode of said first thin-film transistor;
and
a second video signal line electrically connected to the other one of the source electrode or the drain electrode of said second thin-film transistor;
wherein the gate electrode of said first thin-film transistor is electrically connected to a first portion of said gate signal line;
the gate electrode of said second thin-film transistor is electrically connected to a second portion which is more remote than the first portion of said gate signal line from said drive circuit;
and
the electrostatic capacity between said second pixel electrode and said gate signal line is selected to be larger than the electrostatic capacity between said first pixel electrode and said gate signal line.

9 more elements

A liquid crystal display device comprising:

a gate signal line formed on an insulating substrate;
a terminal electrically connected to said gate signal line to receive a drive voltage;
first and second thin-film transistors each having a source electrode, a gate electrode and a drain electrode;
a first pixel electrode electrically connected to either the source electrode or the drain electrode of said first thin-film transistor;
a second pixel electrode electrically connected to either the source electrode or the drain electrode of said second thin-film transistor;
a first video signal line electrically connected to the other one of the source electrode or the drain electrode of said first thin-film transistor;
and
a second video signal line electrically connected to the other one of the source electrode or the drain electrode of said second thin-film transistor;
wherein
the gate electrode of said first thin-film transistor is electrically connected to a first portion of said gate signal line;
the gate electrode of said second thin-film transistor is electrically connected to a second portion which is more remote than the first portion of said gate signal line from said terminal;
the electrostatic capacity between said second pixel electrode and said gate signal line is selected to be larger than the electrostatic capacity between said first pixel electrode and said gate signal line;
the source electrodes of said first and second thin-film transistors are separated from said drain electrodes by a channel length on said gate electrodes and are opposed thereto by a channel width;
and
the width of either the source electrodes or the drain electrodes in a direction from a portion, on which either the source electrodes or the drain electrodes of the first and second thin-film transistors are connected to said pixel electrode and on which said gate electrode is superposed, to a portion where said gate electrode is not superposed, is selected to be smaller than the channel width of said first and second thin-film transistors.

12 more elements

Dependencies are inferred from the claim text.