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US 7,248,320 B2Granted
Liquid crystal display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsYoshiharu Hirakata, Yuriko Hamamoto, Rumo Satake
Life of this patent
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Abstract
Disclination of an active matrix liquid crystal display device is reduced. Portions of pixel electrodes are formed so as to mutually overlap with a convex portion. If the height of the convex portion is too tall, the amount of light leakage increases due to liquid crystals orienting diagonally with respect to a substrate surface. (See FIG. 1C.) If the height of the convex portion is low, the disclination reduction effect is low. The optimal convex portion height is thus determined.
Claims13
A liquid crystal display device comprising:
- at least one thin film transistor over a substrate;
- at least one gate wiring over the substrate and electrically connected with a gate electrode of the at least one thin film transistor;
- at least one source wiring over the substrate and electrically connected with a semiconductor film of the at least one thin film transistor;
- a first interlayer insulating film over the at least one gate wiring and the at least one source wiring;
- a second interlayer insulating film over the first interlayer insulating film;
- at least one convex portion over the second interlayer insulating film, and overlapping with the at least one source wiring;
- and
- at least one pixel electrode formed over, and partially overlapping with the at least one convex portion.
5 more elements
A liquid crystal display device comprising:
- at least one thin film transistor over a first substrate;
- at least one gate wiring over the first substrate and electrically connected with a gate electrode of the at least one thin film transistor;
- at least one source wiring over the first substrate and electrically connected with a semiconductor film of the at least one thin film transistor;
- a first interlayer insulating film over the at least one gate wiring and the at least one source wiring;
- a second interlayer insulating film over the first interlayer insulating film;
- at least one convex portion over the second interlayer insulating film, and overlapping with the at least one source wiring;
- at least one pixel electrode formed over, and partially overlapping with the at least one convex portion;
- a second substrate having at least one color filter and a leveling film coveting the at least one color filter;
- and
- a liquid crystal disposed between the first substrate and the second substrate.
7 more elements
Dependencies are inferred from the claim text.