Electro-optical device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsYoshiharu Hirakata, Shunpei Yamazaki
Life of this patent
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Abstract
In a pixel structure of an active matrix liquid crystal display device, a common electrode branching out from a common line which is maintained at a specified voltage and a pixel electrode connected to a drain of a thin-film transistor arranged on a common plane are wound around each other in spiral form. Electric fields generally oriented parallel to a substrate are produced between the common electrode and pixel electrode arranged in each pixel on the substrate. These electric fields drive a liquid crystal material to provide a visual display. The pixel electrode is surrounded, or fenced off, by the common electrode in each pixel so that the former is kept unaffected from interference from a nearby gate line and/or source line.
Claims12
An active matrix electro-optical device comprising:
- gate lines and source lines arranged on a substrate to form together a grid pattern;
- thin-film transistors located in individual pixels, each of said thin-film transistors having a gate connected to one of said gate lines and a source connected to one of said source lines;
- first electrodes individually connected to drains of said thin-film transistors;
- common lines maintained at a specified voltage;
- and
- second electrodes branching out from said common lines;
- wherein said first and second electrodes are arranged into a spiral form with an arm of each of said first electrodes being wound around an arm of a corresponding one of said second electrodes.
An active matrix electro-optical device comprising:
- first electrodes individually connected to drains of thin-film transistors formed in respective pixels on a substrate;
- second electrodes for producing electric fields between said first and second electrodes, said electric fields containing components parallel to said substrate;
- wherein said first and second electrodes are individually shaped into a spiral form with an arm of each of said first electrodes being wound around an arm of a corresponding one of said second electrodes.
An active matrix electro-optical device comprising:
- gate lines and source lines arranged on a substrate to form together a grid pattern;
- thin-film transistors located in individual pixels, each of said thin-film transistors having a gate connected to one of said gate lines and a source connected to one of said source lines;
- first electrodes individually connected to drains of said thin-film transistors;
- common lines maintained at a specified voltage;
- and
- second electrodes branching out from said common lines;
- wherein said first and second electrodes are arranged into a spiral form with an arm of each of said first electrodes being wound around an arm of a corresponding one of said second electrodes, and
- wherein each of said second electrodes has a part located between a corresponding one of said first electrodes and a corresponding one of said source lines.
An active matrix electro-optical device comprising:
- gate lines and source lines arranged on a substrate to form together a grid pattern;
- thin-film transistors located in individual pixels, each of said thin-film transistors having a gate connected to one of said gate lines and a source connected to one of said source lines;
- first electrodes individually connected to drains of said thin-film transistors;
- common lines maintained at a specified voltage;
- and
- second electrodes branching out from said common lines;
- wherein said first and second electrodes are arranged into a spiral form with an arm of each of said first electrodes being wound around an arm of a corresponding one of said second electrodes, and
- wherein each of said second electrodes has a part located between a corresponding one of said first electrodes and a corresponding one of said source lines.
Dependencies are inferred from the claim text.