In-plane switching mode liquid crystal display device

• US 20080204646A1
• Filed: 06/29/2006
• Published: 08/28/2008
• Est. Priority Date: 06/29/2005
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Lim, Young-Nam
• Granted Patent: US 7,667,804 B2
• Time in Patent Office: Days
• US Class Current: 349/126
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13706 the liquid crystal having positive dielectric anisotropy
• CPC Class Codes: G02F 1/13712 the liquid crystal having negative dielectric anisotropy

Abstract

An in-plane switching (IPS) mode liquid crystal display (LCD) device, comprising: a first substrate and a second substrate; gate lines and data lines formed on the first substrate and crossing each other to form unit pixel regions; a switching device formed at each crossing of the gate lines and the data lines; at least one common electrode and pixel electrode arranged horizontally on the first substrate and generating a horizontal electric field; and a liquid crystal layer formed between the first substrate and the second substrate, wherein when a maximum voltage is applied to the at least one common electrode and pixel electrode, a maximum twist angle between liquid crystal molecules constituting the liquid crystal layer is about 90°. Also, the liquid crystal molecules forming the liquid crystal layer include a liquid crystal molecule having a positive dielectric anisotropy and a liquid crystal molecule having a negative dielectric anisotropy.

Claims

1. An in-plane switching (IPS) mode liquid crystal display (LCD) device, comprising:

a first substrate and a second substrate;

gate lines and data lines formed on the first substrate and crossing each other to form unit pixel regions;

a switching device formed at each crossing of the gate lines and the data lines;

at least one common electrode and pixel electrode arranged horizontally on the first substrate and generating a horizontal electric field; and

a liquid crystal layer formed between the first substrate and the second substrate, wherein when a maximum voltage is applied to the at least one common electrode and pixel electrode, a maximum twist angle between liquid crystal molecules constituting the liquid crystal layer is about 90°

.

2. The IPS-LCD device of claim 1, wherein the liquid crystal molecules of the liquid crystal layer include a liquid crystal molecule having a positive dielectric anisotropy and a liquid crystal molecule having a negative dielectric anisotropy.

3. The IPS-LCD device of claim 1, further comprising first and second alignment layers having a same rubbing direction and formed at each facing surface of the first and second substrates.

4. The IPS-LCD device of claim 3, wherein the common electrode and the pixel electrode are formed to be substantially parallel to the data line.

5. The IPS-LCD device of claim 4, wherein the rubbing direction has an inclined angle of about 45°

with respect to the common electrode and the pixel electrode.

6. The IPS-LCD device of claim 3, wherein the common electrode and the pixel electrode are formed to have a bent portion with an inclined angle of about 0°

˜

45°

from an extended direction of the data line in the unit pixel region.

7. The IPS-LCD device of claim 6, wherein the rubbing direction has an inclined angle of about 45°

with respect to the common electrode and the pixel electrode.

8. The IPS-LCD device of claim 1, further comprising:

a color filter formed on the second substrate; and

a light shielding layer formed on the second substrate.

9. An in-plane switching (IPS) mode liquid crystal display (LCD) device, comprising:

a first substrate and a second substrate;

gate lines and data lines formed on the first substrate and crossing each other to form unit pixel regions;

a switching device formed at each crossing of the gate lines and the data lines;

at least one common electrode and pixel electrode arranged horizontally on the first substrate and generating a horizontal electric field; and

a liquid crystal layer formed between the first substrate and the second substrate, the liquid crystal layer including a liquid crystal molecule having a positive dielectric anisotropy and a liquid crystal molecule having a negative dielectric anisotropy,

wherein when a maximum voltage is applied to the at least one common electrode and pixel electrode, a maximum twist angle of the liquid crystal molecules of the liquid crystal layer is about 90°

.

10. An in-plane switching (IPS) mode liquid crystal display (LCD) device, comprising:

a first substrate and a second substrate;

gate lines and data lines crossing each other on the first substrate to form unit pixel regions;

a switching device formed at each crossing of the gate lines and the data lines;

at least one common electrode and pixel electrode arranged horizontally on the first substrate and generating a horizontal electric field; and

a liquid crystal layer formed between the first substrate and the second substrate,

wherein liquid crystal molecules constituting the liquid crystal layer include a liquid crystal molecule having a positive dielectric anisotropy and a liquid crystal molecule having a negative dielectric anisotropy.