Liquid crystal display device having reduced color shift

Patent metadata

Field	Value
Publication number	US-9946116-B2
Application number	US-201213428942-A
Country	US
Kind code	B2
Filing date	Mar 23, 2012
Priority date	Oct 7, 2011
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

The present invention relates to a liquid crystal display device that prevents a color shift by allowing two sub-pixel areas to have the same transmittance. A liquid crystal display device according to the present invention includes a data line that includes: a connection portion having a direction of extension perpendicular to that of a gate line; a first portion oriented at a first angle with respect to a direction of extension of the connection portion; and a second portion oriented at a second angle different from the first angle with respect to the direction of extension of the connection portion, and wherein an angle between a rubbing direction of the liquid crystal and the connection portion satisfies
θ L = θ 2 - θ 1 2
(where θ L is the angle between the rubbing direction of the liquid crystal and the direction of extension of the connection portion, θ 1 : the first angle, θ 2 : the second angle).

First claim

What is claimed is:

1. The liquid crystal display device comprising:
a first substrate and a second substrate;
a liquid crystal positioned between the first substrate and the second substrate;
a gate line and a data line disposed on the first substrate and defining a pixel area;
a switching element connected to the gate line and the data line;
a common line separated from the gate line;
a contact electrode extending from the common line;
a common electrode connected to the contact electrode and disposed in the pixel area; and
a pixel electrode electrically separated from the common electrode, overlapping the common electrode in plan view, disposed in the pixel area, and connected to the switching element,
wherein the pixel area comprises a first sub-pixel area and a second sub-pixel area,
wherein the pixel electrode comprises a first sub-pixel electrode disposed in the first sub-pixel area and a second sub-pixel electrode disposed in the second sub-pixel area,
wherein the first sub-pixel electrode comprises a first slit extending in a first direction, and the second sub-pixel electrode comprises a second slit extending in a second direction different from the first direction,
wherein the contact electrode is disposed in the first sub-pixel area;
wherein a side of the first sub-pixel area is oriented at a first oblique angle with respect to a normal to the gate line and a side of the second sub-pixel area is oriented at a second oblique angle with respect to the normal to the gate line, the second oblique angle being different from the first oblique angle, so that the first sub-pixel area is larger than the second sub-pixel area by an amount equal to an area of the contact electrode.

2. The liquid crystal display of claim 1 , wherein:
the data line includes:
a first portion extending in the first direction and disposed adjacent to the first sub-pixel,
a second portion extending in the second direction and disposed adjacent to the second sub-pixel, and
a connection portion connecting the first portion and the second portion;

a length of the first portion is different from a length of the second portion;
the connection portion has a direction of extension at least approximately perpendicular to the gate line;
the first portion is oriented at a first angle with respect to the direction of extension of the connection portion; and
the second portion is oriented at a second angle with respect to the direction of extension of the connection portion, wherein the second angle is different from the first angle,
and wherein an angle between a rubbing direction of the liquid crystal and the direction of extension of the connection portion satisfies

θ
L

=

θ
2

-

θ
1

2

(where θL is an angle between the rubbing direction of the liquid crystal and the direction of extension of the connection portion, θ1: the first angle, θ2: the second angle).

3. The liquid crystal display device of claim 2 , wherein
the first angle and the second angle are such that a plurality of the connection portions are positioned along a line.

4. The liquid crystal display device of claim 2 , wherein:
the first slit is formed at least partially in the first sub-pixel area, and an angle between the portion of the first slit formed in the first sub-pixel area and the direction of extension of the connection portion is the same as the first angle.

5. The liquid crystal display device of claim 4 , wherein
the second slit is formed at least partially in the second sub-pixel area, and an angle between the portion of the second slit formed in the second sub-pixel area and the direction of extension of the connection portion is the same as the second angle.

6. The liquid crystal display device of claim 5 , wherein
an angle between the rubbing direction of the liquid crystal and the portion of the first slit formed in the first sub-pixel area is the same as an angle between a rubbing direction of the liquid crystal and the portion of the second slit formed in the second sub-pixel area.

7. The liquid crystal display device of claim 1 , further comprising:
a first passivation layer and a second passivation layer each formed on the first substrate;
a first contact hole exposing the contact electrode and formed in the first passivation layer; and
a second contact hole exposing at least a portion of the switching element and formed in both the first passivation layer and the second passivation layer,
wherein the common electrode is formed directly on the first passivation layer and is connected to the contact electrode through the first contact hole, and
the pixel electrode is formed directly on the second passivation layer and is connected to the switching element through the second contact hole.

8. The liquid crystal display device of claim 7 , wherein
the first passivation layer is made of an organic insulating material and wherein
the second passivation layer is made of an inorganic insulating material.

9. The liquid crystal display device of claim 8 , further comprising
a third passivation layer formed under the first passivation layer and made of an inorganic insulating material.

10. The liquid crystal display device of claim 1 , wherein
the first angle (θ 1 ) is substantially 5 degrees and the second angle (θ 2 ) is substantially 7 degrees.

11. The liquid crystal display device of claim 1 , further comprising:
a first passivation layer and a second passivation layer each formed on the first substrate;
a first contact hole positioned over the contact electrode and formed in the first passivation layer; and
a second contact hole positioned over at least a portion of the switching element and formed in the first passivation layer,
wherein the pixel electrode is formed directly on the first passivation layer and is connected to the switching element through the second contact hole, and
the common electrode is formed directly on the second passivation layer and is coupled to the contact electrode through the first contact hole.

12. The liquid crystal display device of claim 2 , further comprising
a first polarizer formed outside the first substrate,
wherein a transmissive axis of the first polarizer is perpendicular to a rubbing direction of the liquid crystal.

13. The liquid crystal display device of claim 12 , wherein
the connection portion has a direction of extension at least approximately perpendicular to the gate line,
the first polarizer is formed as a rectangle having a same plane surface as the first substrate, and
an angle between the transmissive axis of the first polarizer and one edge of the first polarizer is substantially the same as an angle between the rubbing direction of the liquid crystal and the direction of extension of the connection portion.

14. The liquid crystal display device of claim 13 , further comprising
a second polarizer formed outside the second substrate,
wherein a transmissive axis of the second polarizer is substantially perpendicular to the transmissive axis of the first polarizer.

15. The liquid crystal display device of claim 2 , further comprising
a first polarizer formed outside the first substrate,
wher

Assignees

• Seo Joo Hong
• Heo Jeong Uk
• Kim Won Jin
• Kim Seung Jin
• Lee Sun Jung
• Jung Sang Hun
• Son Min Hee
• Samsung Display Co Ltd

Inventors

• Seo Joo Hong
• Heo Jeong Uk
• Kim Won Jin
• Kim Seung Jin
• Lee Sun-Jung
• Jung Sang-Hun
• Son Min Hee

Classifications

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• G02F1/133784 Primary

  by rubbing · CPC title

• G02F2001/134372

  Physics · mapped topic

• G02F2001/134345

  Physics · mapped topic

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title