IPS mode liquid crystal display device and method for fabricating thereof

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

a unit pixel defined by a plurality of gate lines and a plurality of data lines crossing the gate lines;

a common electrode line disposed in the unit pixel;

a switching device formed in a vicinity of an intersection between the gate lines and the data lines and disposed in the unit pixel;

a passivation layer for covering the unit pixel;

at least one first concave pattern formed in the unit pixel that exposes the common electrode line;

at least one second concave pattern formed in the unit pixel that exposes a drain electrode of the switching device,

wherein a common electrode electrically connected to the common electrode line is disposed in the first concave pattern, and

wherein a pixel electrode electrically connected to the drain electrode of the switching device is disposed in the second concave pattern.

2. The device of claim 1 , wherein the pixel electrode and the common electrode are parallel with each other.

3. The device of claim 1 , wherein the pixel electrode and the common electrode are insulated by an overcoat layer disposed in the first concave pattern and the second concave pattern.

4. The device of claim 3 , wherein the overcoat layer is hardened.

5. The device of claim 1 , further comprising a storage line in the unit pixel.

6. The device of claim 5 , wherein the drain electrode overlaps with the storage line with an insulating layer disposed therebetween.

7. The device of claim 1 , wherein the first concave pattern and the second concave pattern are formed by cutting a gate insulating layer and the passivation layer formed in the unit pixel.

8. The device of claim 1 , wherein the common electrode is electrically connected to the common electrode line to a portion of the common electrode line exposed by the first concave pattern.

9. The device of claim 1 , wherein the pixel electrode is electrically connected to the drain electrode to a portion of the drain electrode exposed by the second concave pattern.

10. The device of claim 1 , wherein the switching device comprises:

a gate electrode branching from the gate line;

a source electrode branching from the data line;

the drain electrode extended to correspond to overlap with the storage line; and

an active layer disposed between the source electrode and the drain electrode.

11. An in-plane switching LCD device, comprising: a storage line disposed in a unit pixel of the LCD device, the storage line configured to provide a storage voltage; a switching device disposed in the unit pixel, the switching device including a drain electrode configured to provide a data signal to a pixel electrode, wherein a portion of the drain electrode overlaps the storage line in the unit pixel to form a storage capacitor; a common electrode and a pixel electrode disposed in the unit pixel; a first concave area formed over the sudstrate in the unit pixel occupied by the common electrode; a second concave area formed over the substrate in the unit pixel occupied by the pixel electrode; and an insulating layer disposed over a substrate in the unit pixel except in the first and second concave areas, wherein the common and pixel electrodes apply a horizontal electric field in conjunction with the other.

12. The device of claim 11 , further comprising an overcoat layer disposed over the common electrode in the first concave area and over the pixel electrode in the second concave area.

13. An in-plane switching LCD device, comprising:

a common electrode disposed in a first concave pattern in a unit pixel, wherein the first concave pattern exposes a portion of a common electrode line such that the common electrode branches from and electrically connects with the common electrode line, wherein the common and pixel electrodes apply a horizontal electric field in conjunction with each other;

a pixel electrode disposed in a second concave pattern in the unit pixel, wherein the second concave pattern exposes a portion of a drain electrode of a switching device such that the pixel electrode electrically connects with the drain electrode; and

a storage line disposed in the unit pixel, wherein a portion of the drain electrode of the switching device extends over the storage line to form a storage capacitor.