ORGANIC LIGHT EMITTING DIODE DISPLAY AND DRIVING METHOD THEREOF

• US 20110051055A1
• Filed: 11/11/2009
• Published: 03/03/2011
• Est. Priority Date: 09/02/2009
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, Jaeseok, Park, Dongseok, Lee, Hwideuk
• Granted Patent: US 8,208,098 B2
• Time in Patent Office: Days
• US Class Current: 349/106
• CPC Class Codes: G02F 1/1323 Arrangements for providing a switchable viewing angle
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• 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 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/1395 Optically compensated birefringence [OCB]- cells or PI- cells

Abstract

A liquid crystal display device includes: a liquid crystal panel including red, green, and blue subpixels and a viewing angle control subpixel, wherein the viewing angle control subpixel includes a lower transparent electrode formed between a shielding electrode and an upper transparent electrode, the lower transparent electrode is formed on the first substrate and connected to the upper transparent electrode, the lower transparent electrode overlaps with the shielding electrode with a first insulation film interposed therebetween to form a storage capacitor.

Claims

1. A liquid crystal display device comprising:

a liquid crystal panel including red, green, and blue subpixels and a viewing angle control subpixel,

wherein the viewing angle control subpixel includes a lower transparent electrode formed between a shielding electrode and an upper transparent electrode, the lower transparent electrode being on a first substrate, and connected to the upper transparent electrode, and

wherein the lower transparent electrode overlaps with the shielding electrode with a first insulation film interposed therebetween to form a storage capacitor.

2. The liquid crystal display device of claim 1, wherein the viewing angle control subpixel comprises:

a shielding electrode on the first substrate;

a first insulation film on the shielding electrode;

a lower transparent electrode on the first insulation film;

a second insulation film covering the lower transparent electrode disposed on the first insulation film with a part of the lower transparent electrode being exposed; and

an upper transparent electrode on the second insulation film, and being connected to the lower transparent electrode.

3. The liquid crystal display device of claim 1, wherein the shielding electrode and the lower transparent electrode have at least three sides within the area of the viewing angle control subpixel.

4. The liquid crystal display device of claim 1, wherein the three sides of the shielding electrode and the lower transparent electrode partially overlap with each other within the area of the viewing angle control subpixel.

5. The liquid crystal display device of claim 1, wherein the viewing angle control subpixel comprises:

a black matrix layer on a second substrate;

an overcoating layer on the black matrix layer; and

an upper common electrode on the overcoating layer.

6. The liquid crystal display device of claim 5, wherein the upper common electrode corresponds to the upper transparent electrode within the area of the viewing angle control subpixel.

7. The liquid crystal display device of claim 1, wherein the red, green, and blue subpixels comprise respectively a color filter layer on the second substrate.

8. The liquid crystal display device of claim 1, wherein the red, green, and blue subpixels comprise respectively:

a pixel electrode formed on the first insulation film; and

a lower common electrode formed on the second insulation film and having a plurality of segments.

9. The liquid crystal display device of claim 8, wherein the lower common electrode adjacent to the viewing angle control subpixel is connected to the shielding electrode.

10. The liquid crystal display device of claim 1, wherein the red, green, and blue subpixels and the viewing angle control subpixel are arranged in a quad type.

11. The liquid crystal display device of claim 1, wherein the red, green, and blue subpixels operate in an FFS (Fringe Field Switching) mode, and the viewing angle control subpixel operates in an ECB (Electrically Controlled Birefringence) mode.

12. A manufacturing method of a liquid crystal display device, comprising:

defining areas for red, green, and blue subpixels and an area for a viewing angle control subpixel on a first substrate;

forming gate lines;

forming a shielding electrode in the area of the viewing angle control subpixel;

forming a first insulation film on the gate lines;

forming data lines crossing the gate lines;

forming a lower transparent electrode on the first insulation film to overlap with the shielding electrode and forming a pixel electrode on the first insulation film formed in the areas for the red, green, and blue subpixels;

forming a second insulation film on the lower transparent electrode and the pixel electrode; and

forming a upper transparent electrode connected to the lower transparent electrode on the second insulation film in the area for the viewing angle control subpixel and forming a lower common electrode having a plurality of segments on the second insulation film in the areas for the red, green, and blue subpixels.

13. The method of claim 12, wherein the shielding electrode and the lower transparent electrode have at least three sides within the area of the viewing angle control subpixel.

14. The method of claim 12, wherein the three sides of the shielding electrode and the lower transparent electrode partially overlap with each other within the area of the viewing angle control subpixel.

15. The method of claim 12, further comprising forming a second substrate to be adhered to the first substrate,

wherein the forming the second substrate comprises:

defining areas for the red, green, and blue subpixels and an area for the viewing angle control subpixel on the second substrate; and

forming a black matrix layer on the second substrate; and

forming an overcoating layer on the black matrix layer.

16. The method of claim 15, further comprising forming an upper common electrode on the overcoating layer in the area for the viewing angle control subpixel.

17. The method of claim 16, wherein the upper common electrode is formed so as to correspond to the upper transparent electrode within the area of the viewing angel control subpixel.

18. The method of claim 12, wherein the upper transparent electrode is connected to the lower transparent electrode through a first contact hole formed in the second insulation film.

19. The method of claim 12, wherein the lower common electrode formed adjacent to the viewing angle control subpixel is connected to the shielding electrode through a second contact hole formed in the second insulation film.

20. The method of claim 12, wherein the red, green, and blue subpixels and the viewing angle control subpixel are arranged in a quad type.