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US 7,609,332 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.
Claims14
A liquid crystal display device comprising:
- at least one semiconductor layer over a substrate;
- a gate insulating film over the at least one semiconductor layer;
- a gate electrode over the gate insulating film;
- an insulating film over the gate electrode;
- at least one gate wiring over the insulating film, and overlapping a portion of the at least one semiconductor layer;
- at least one source wiring over the substrate;
- at least one convex portion overlapping with the at least one of the at least one gate wiring and the at least one source wiring;
- and
- at least one pixel electrode partially overlapping with, and provided over the at least one convex portion.
6 more elements
A liquid crystal display device comprising:
- at least one semiconductor layer over a substrate;
- a gate insulating film over the at least one semiconductor layer;
- a gate electrode over the gate insulating film;
- an insulating film over the gate electrode;
- at least one gate wiring over the insulating film, and overlapping a portion of the at least one semiconductor layer;
- at least one source wiring over the substrate;
- at least one convex portion having a first height overlapping with the at least one gate wiring;
- at least one convex portion having a second height overlapping with the at least one source wiring;
- and
- at least one pixel electrode partially overlapping with, and provided over the at least one convex portion having the first height and the at least one convex portion having the second height.
7 more elements
Dependencies are inferred from the claim text.