Thin film transistor array panel and liquid crystal display device including the same

1. An apparatus comprising:

a substrate;

a first pixel electrode and a second pixel electrode disposed to face each other on the substrate;

a branch electrode extending from one of the first pixel electrode and the second pixel electrode; and

a dummy electrode disposed under the first pixel electrode, the second pixel electrode, or both the first pixel electrode and the second pixel electrode,

wherein the other of the first pixel electrode and the second pixel electrode is free of any branch electrode, and

wherein the dummy electrode is electrically connected to the first pixel electrode or the second pixel electrode.

2. The apparatus of claim 1 , wherein

the substrate comprises a plurality of pixel areas,

a plurality of the first pixel electrodes and the second pixel electrodes are disposed in the pixel areas, the first pixel electrode and the second pixel electrode are alternately disposed, and

the dummy electrode is disposed in the plurality of pixel areas.

3. The apparatus of claim 1 , wherein the branch electrode extends from the first pixel electrode, and the dummy electrode is disposed under the first pixel electrode.

4. The apparatus of claim 3 , wherein

the dummy electrode is disposed to overlap the first pixel electrode and the branch electrode.

5. The apparatus of claim 1 , further comprising:

a gate line disposed on the substrate and configured to transmit a gate signal;

a voltage transmitting line disposed on the substrate and configured to transmit a predetermined voltage;

a data line disposed on the substrate and configured to transmit a data signal;

a first thin film transistor connected to the gate line and the voltage transmitting line; and

a second thin film transistor connected to the gate line and the data line,

wherein the first pixel electrode is connected to the first thin film transistor, and

the second pixel electrode is connected to the second thin film transistor.

6. The apparatus of claim 5 , further comprising:

an insulating layer disposed between the dummy electrode and the first and second pixel electrodes.

7. The apparatus of claim 6 , wherein

the insulating layer comprises a contact hole exposing the dummy electrode, and

the first pixel electrode is connected to the dummy electrode through the contact hole.

8. The apparatus of claim 7 , wherein

the dummy electrode is disposed under the second pixel electrode,

the branch electrode extends from the second pixel electrode, and

the dummy electrode is disposed to overlap the second pixel electrode and the branch electrode.

9. The apparatus of claim 6 , wherein

the insulating layer has a contact hole exposing the dummy electrode, and

the second pixel electrode is connected to the dummy electrode through the contact hole.

10. The apparatus of claim 9 , wherein

the dummy electrode is disposed under the first pixel electrode,

the branch electrode extends from the first pixel electrode, and

the dummy electrode is disposed to overlap the first pixel electrode and the branch electrode.

11. The apparatus of claim 6 , wherein

the thickness of the insulating layer is more than about pm and less than about 3μm.

12. The apparatus of claim 11 , wherein

the insulating layer comprises silicon nitride, and

the thickness of the insulating layer is about 2μm.

13. The apparatus of claim 1 , wherein

the branch electrode extends from the first pixel electrode in a direction facing the second pixel electrode, and

the length of the branch electrode is larger than the width of the first pixel electrode and is smaller than the interval between the first pixel electrode and the second pixel electrode.

14. The apparatus of claim 13 , wherein

a plurality of branch electrodes are formed, and

the interval between the branch electrodes is equal to or larger than the width of the branch electrode.

15. The apparatus of claim 1 , wherein

the first pixel electrode and the second pixel electrode are disposed on the same layer.

16. The apparatus of claim 1 , wherein the first pixel electrode and the second pixel electrode are disposed on different layers.

17. The apparatus of claim 15 , wherein the length of the branch electrode is less than a value of the width of the second pixel electrode subtracted from the interval between the first pixel electrode and the second pixel electrode.

18. The apparatus of claim 16 , wherein the length of the branch electrode is smaller than the interval between the first pixel electrode and the second pixel electrode or larger than the interval between the first pixel electrode and the second pixel electrode.

19. The apparatus of claim 7 , wherein:

the contact hole comprises a first contact hole, a second contact hole, and a third contact hole;

the first pixel electrode is connected to a first drain electrode through the first contact hole;

the second pixel electrode is connected to a second drain electrode through the second contact hole; and

the first pixel electrode is connected to the dummy electrode through the third contact hole.

20. A liquid crystal display comprising:

a first substrate and a second substrate facing each other;

a gate line disposed on the first substrate;

a voltage transmitting line disposed on the first substrate;

a data line disposed on the first substrate and configured to transmit a data signal;

a first thin film transistor connected to the gate line and the voltage transmitting line;

a second thin film transistor connected to the gate line and the data line;

a first pixel electrode connected to the first thin film transistor;

a second pixel electrode connected to the second thin film transistor and facing the first pixel electrode;

a branch electrode extending from one of the first pixel electrode and the second pixel electrode;

a liquid crystal layer disposed between the first substrate and the second substrate, having positive dielectric anisotropy, and being aligned vertically; and

a dummy electrode disposed under the first pixel electrode, the second pixel electrode, or both the first pixel electrode and the second pixel electrode,

wherein the other of the first pixel electrode and the second pixel electrode is free of any branch electrode, and

wherein the dummy electrode is electrically connected to the first pixel electrode or the second pixel electrode.

21. The liquid crystal display of claim 20 , further comprising:

an insulating layer disposed between the dummy electrode and the first and second pixel electrodes,

wherein the insulating layer comprises a contact hole exposing the dummy electrode, and

the first pixel electrode or the second pixel electrode is connected to the dummy electrode through the contact hole.