LIQUID CRYSTAL DISPLAY

• US 20090207366A1
• Filed: 02/17/2009
• Published: 08/20/2009
• Est. Priority Date: 02/18/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: KIM, Dong-Gyu
• Granted Patent: US 8,169,579 B2
• Time in Patent Office: Days
• US Class Current: 349/147
• 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 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making

Abstract

A liquid crystal display (LCD) has pixels with large effective aperture ratios. The LCD includes: a first insulating film formed over the gate line and the common electrode; a data line formed over the first insulating film, the data line crossing over the gate line, the data line being bent in a zigzag manner; a second insulating film formed over the data line; a pixel electrode formed over the second insulating film and comprising a plurality of subpixel electrodes substantially parallel to the data line, the pixel electrode comprising a connecting electrode interconnecting the subpixel electrodes; a shielding electrode formed over the second insulating film to overlie the data line; and a liquid crystal layer.

Claims

1. A liquid crystal display (LCD) comprising:

a first insulating substrate;

a gate line formed over the first insulating substrate;

a common electrode insulated from the gate line;

a first insulating film formed over the gate line and the common electrode;

a data line formed over the first insulating film, the data line crossing over the gate line, the data line being bent in a zigzag manner;

a second insulating film formed over the data line;

a pixel electrode formed over the second insulating film and comprising a plurality of subpixel electrodes substantially parallel to the data line, the pixel electrode comprising a connecting electrode interconnecting the subpixel electrodes;

a shielding electrode formed over the second insulating film to overlie the data line;

a second insulating substrate which faces the first insulating substrate; and

a liquid crystal layer interposed between the first insulating substrate and the second insulating substrate; and

wherein at least one end of each of the subpixel electrodes has a side slanted at a greater angle to a direction perpendicular to the gate line than the data line'"'"'s portion adjacent to said each of the subpixel electrodes.

2. The LCD of claim 1 arranged for the shielding electrode to receive the same voltage as the common electrode.

3. The LCD of claim 1, further comprising a common electrode line formed over the first insulating substrate in parallel to the gate line and connected to the common electrode.

4. The LCD of claim 3, wherein the common electrode line is electrically connected to the shielding electrode.

5. The LCD of claim 4, wherein the common electrode line is connected to the shielding electrode through a contact hole.

6. The LCD of claim 1, wherein the shielding electrode overlaps the common electrode by a predetermined length.

7. The LCD of claim 6, wherein the shielding electrode overlaps a common electrode of a neighboring pixel by a predetermined length.

8. The LCD of claim 7, wherein the predetermined length by which the shielding electrode overlaps the common electrode is 0.5 to 4 μ

m.

9. The LCD of claim 1, wherein the shielding electrode is made of a material identical to that of the pixel electrode.

10. The LCD of claim 9, wherein the shielding electrode and the pixel electrode are made of indium tin oxide (ITO) or indium zinc oxide (IZO).

11. The LCD of claim 1, wherein a gap between any two adjacent subpixel electrodes widens towards the gate line.

12. The LCD of claim 11, wherein at least two of the subpixel electrodes are substantially symmetrical to each other with respect to the connecting electrode.

13. The LCD of claim 1, wherein a dielectric constant of the second insulating film is four or less.

14. The LCD of claim 1, wherein a thickness of the second insulating film is 0.6 to 1 μ

m.

15. The LCD of claim 1, wherein the liquid crystal layer comprises liquid crystal molecules having positive dielectric anisotropy.

16. The LCD of claim 15, wherein the liquid crystal molecules are aligned perpendicular to the gate line when no voltage is applied to them.

18. A method for using the LCD of claim 1, the method comprising providing a predefined voltage to the shielding and common electrodes.

17. A method for fabricating a liquid crystal display (LCD), the method comprising:

obtaining a first insulating substrate;

providing a gate line formed over the first insulating substrate;

providing a common electrode insulated from the gate line;

providing a first insulating film formed over the gate line and the common electrode;

providing a data line formed over the first insulating film, the data line crossing over the gate line, the data line being bent in a zigzag manner;

providing a second insulating film formed over the data line;

providing a pixel electrode formed over the second insulating film and comprising a plurality of subpixel electrodes substantially parallel to the data line, the pixel electrode comprising a connecting electrode interconnecting the subpixel electrodes;

providing a shielding electrode formed over the second insulating film to overlie the data line;

providing a second insulating substrate which faces the first insulating substrate; and

providing a liquid crystal layer interposed between the first insulating substrate and the second insulating substrate.