IP Library Granted Patent US 8,520,177
Granted Patent B2
US 8,520,177 · App. 13/449,994 · Granted Aug 27, 2013

Liquid crystal display device

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Quick Facts
Patent No.
US 8,520,177
App. No.
13/449,994
Granted
Aug 27, 2013
Kind
B2
Abstract

A liquid crystal display device includes a first substrate on which pixels having a thin film transistor are formed in regions surrounded by scanning lines and video signal lines, a second substrate which faces the first substrate and having color filters and light blocking films formed thereon, and a liquid crystal layer which is sandwiched between the first substrate and the second substrate. The thin film transistor has a gate electrode connected to the scanning line, a drain electrode connected to the video signal line and a source electrode connected to a pixel electrode. The pixels include first pixels having a first width and second pixels having a second width smaller than the first width. The pixel electrode of the second pixel has a branch electrode extending from the pixel electrode with at least a portion of the branch electrode overlapping the video signal line or the scanning line.

Claims (12)

1. A liquid crystal display device comprising:

a first substrate on which pixels are formed in regions surrounded by scanning lines which extend in a first direction and video signal lines which extend in a second direction, each of the pixels having a thin film transistor;

a second substrate which faces the first substrate in an opposed manner and having color filters and light blocking films formed thereon; and

a liquid crystal layer which is sandwiched between the first substrate and the second substrate;

wherein a gate electrode of the thin film transistor is connected to the scanning line, a drain electrode of the thin film transistor is connected to the video signal line and a source electrode of the thin film transistor is connected to a pixel electrode;

wherein the pixels include first pixels having a first width and second pixels having a second width is smaller than the first width;

wherein the pixel electrode of the second pixel has a branch electrode extending from the pixel electrode, at least a portion of the branch electrode overlapping the video signal line or the scanning line; and

wherein a direction that the branch electrode extends from the pixel electrode falls within a range of 9 degrees to 45 degrees in a liquid crystal rotational direction when a voltage is applied to the pixel with respect to a direction orthogonal to a liquid crystal initial alignment direction on the first substrate.

2. A liquid crystal display device according to claim 1 , wherein the pixels include a counter electrode facing the pixel electrode via an insulation film.

3. A liquid crystal display device according to claim 1 , wherein the branch electrode has at least a portion overlapped with the light blocking film formed on the second substrate.

4. A liquid crystal display device according to claim 1 , wherein in the second pixel, a second branch electrode extends from the pixel electrode.

5. A liquid crystal display device according to claim 4 , wherein at least a portion of the second branch electrode overlaps the video signal line or the scanning line.

Assignments (5)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 10, 2025
From: JAPAN DISPLAY INC
To: MAGNOLIA PURPLE CORPORATION
Reel/Frame 071890/0202 →
CHANGE OF NAME Recorded Nov 17, 2023
From: HITACHI DISPLAYS, LTD.
To: JAPAN DISPLAY EAST, INC.
Reel/Frame 065614/0223 →
CHANGE OF NAME Recorded Nov 17, 2023
From: JAPAN DISPLAY EAST, INC.
To: JAPAN DISPLAY, INC.
Reel/Frame 065614/0644 →
CHANGE OF ADDRESS Recorded Nov 17, 2023
From: JAPAN DISPLAY, INC.
To: JAPAN DISPLAY, INC.
Reel/Frame 065654/0250 →
NUNC PRO TUNC ASSIGNMENT Recorded Nov 17, 2023
From: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
To: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Reel/Frame 065615/0327 →