IP Library Granted Patent US 7,916,258
Granted Patent B2
US 7,916,258 · App. 09/737,770 · Granted Mar 29, 2011

In-plane switching LCD panel

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Quick Facts
Patent No.
US 7,916,258
App. No.
09/737,770
Granted
Mar 29, 2011
Kind
B2
Abstract

An IPS-LCD panel includes first and second substrates, and a liquid crystal interposed therebetween. The first substrate includes common and pixel electrodes that are formed of a transparent conductive material. Because the common and pixel electrodes are transparent, aperture ratios of the inventive IPS-LCD panel are increased. Another IPS-LCD panel includes opaque pixel electrodes and transparent common electrodes. In forming the opaque pixel electrodes, a black matrix of the same material as the pixel electrodes is also formed on the first substrate. Because the inventive black matrix is much smaller than a conventional one, the aperture ratios of the second inventive IPS-LCD panel become higher.

Claims (46)

1. An in-plane switching liquid crystal display device comprising:

a gate line formed of a first material on a first substrate;

a data line on the first substrate, the data line being perpendicular to the gate line;

a common line on the first substrate, the common line being parallel with the gate line and being formed of a metal;

a plurality of pixel electrodes and a plurality of common electrodes having finger portions and arranged in parallel on the first substrate, the common electrodes being a transparent conductive second material different from the first material, and the pixel electrodes being one of a transparent and opaque material;

a first connecting line parallel to the gate line, wherein the plurality of pixel electrodes are perpendicular to the first connecting line, first ends of the pixel electrodes are connected to the first connecting line and second ends of the pixel electrodes are connected to a second connecting line;

an auxiliary common line connected with the plurality of common electrodes, the auxiliary common line covering the common line such that the auxiliary common line contacts side and top surfaces of the common line;

a storage electrode over the common line, wherein the storage electrode contacts the second connecting line via a storage contact hole; and

a liquid crystal layer between the first and second substrates, wherein the common electrodes alternate with and are parallel to the pixel electrodes,

wherein the common electrodes are formed on a same layer of the first substrate as the gate line.

2. The device of claim 1 , wherein the transparent conductive material includes indium tin oxide (ITO).

3. The device of claim 1 , wherein the transparent conductive material includes indium zinc oxide (IZO).

4. The device of claim 1 , wherein the common line includes a material selected from a group consisting of chromium (Cr), aluminum (Al), aluminum alloy (Al alloy), molybdenum (Mo), Tantalum (Ta), tungsten (W), antimony (Sb), and an alloy thereof.

5. The device of claim 1 , further comprising a first alignment layer on the first substrate.

6. The device of claim 5 , wherein the first alignment layer is selected from a group consisting of polymide and photo-alignment material.

7. The device of claim 1 , further comprising a thin film transistor at an intersection of the gate and data lines.

8. The device of claim 1 , further comprising a gate-insulating layer over the gate line.

9. The device of claim 8 , further comprising a passivation layer over the gate-insulating layer.

10. The device of claim 9 , wherein the pixel electrodes are on the passivation layer.

11. The device of claim 9 , further comprising a black matrix on the passivation layer.

12. The device of claim 11 , wherein the black matrix includes the same material as the pixel electrodes.

13. An in-plane switching Liquid Crystal Display (LCD) device, comprising:

a first substrate and a second substrate;

a gate line formed of a first material on the first substrate;

a metal common line on the first substrate, the common line parallel to the gate line;

a data line on the first substrate, the data line being perpendicular to the gate line;

a plurality of common electrodes on the first substrate, the plurality of common electrodes having finger portions;

an auxiliary common line connected with the plurality of common electrodes, the auxiliary common line covering the common line such that the auxiliary common line contacts side and top surfaces of the common line;

a thin film transistor having a gate electrode, a source electrode and a drain electrode formed on the first substrate;

a liquid crystal layer interposed between the first and second substrates;

a plurality of pixel electrodes contacting the drain electrode of the thin film transistor;

a first connecting line contacting the drain electrode and parallel to the gate line, wherein the plurality of pixel electrodes are perpendicular to the first connecting line, first ends of the pixel electrodes are connected to the first connecting line and second ends of the pixel electrodes are connected to a second connecting line; and

a storage electrode over the common line, wherein the storage electrode contacts the second connecting line,

wherein the common electrodes alternate with and are parallel to the pixel electrodes, and

wherein the common electrodes are a transparent conductive second material different from the first material, the pixel electrodes are one of a transparent and opaque material, and the common electrodes are formed on a same layer of the first substrate as the gate line.

14. The LCD device of claim 13 , wherein a portion of the common line overlies a portion of the common electrode.

15. The LCD device of claim 13 , wherein the storage electrode contacts the pixel electrodes through a storage contact hole.

16. The LCD device of claim 13 , wherein the storage electrode is between the pixel electrodes and the first substrate.

17. The LCD device of claim 13 , further comprising a common pad at an end of the common line.

18. The LCD device of claim 13 , further comprising an auxiliary gate line and a gate pad covering the gate line and the gate pad.

19. The LCD device of claim 18 , wherein the auxiliary gate line is formed of the same transparent conductive material as the common electrodes.

20. The device of claim 18 , wherein the auxiliary gate line includes indium tin oxide (ITO).

21. The device of claim 18 , wherein the auxiliary gate line includes indium zinc oxide (IZO).

22. The LCD device of claim 13 , further comprising a black matrix on the second substrate.

23. The LCD device of claim 13 , wherein the transparent conductive material includes indium tin oxide (ITO).

24. The LCD device of claim 13 , wherein the transparent conductive material includes indium zinc oxide (IZO).

Assignments (1)
CHANGE OF NAME Recorded Oct 17, 2008
From: LG.PHILIPS LCD CO., LTD.
To: LG DISPLAY CO., LTD.
Reel/Frame 021763/0177 →