POLARIZING PLATE, DISPLAY PANEL HAVING THE SAME, AND DISPLAY DEVICE HAVING THE SAME

• US 20080106672A1
• Filed: 10/31/2007
• Published: 05/08/2008
• Est. Priority Date: 11/02/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Seung-Mo, Jung, Jin-Mi, Lee, Kang-Woo, Lee, Jeong-Hwan, Kim, Joong-Hyun, Choi, Jin-Sung
• Granted Patent: US 7,880,832 B2
• Time in Patent Office: Days
• US Class Current: 349/62
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133548 Wire-grid polarisers

Abstract

A polarizing plate includes a base layer, a buffer layer and a plurality of conductive lattice lines. The buffer is formed on the base layer. The conductive lattice lines are formed on the buffer layer in a stripe shape to reflect and polarize incident light. The buffer layer protects the conductive lattice lines. The conductive lattice lines include a silver (Ag) layer or an aluminum (Al) layer. Therefore, the buffer layer protects the conductive lattice lines, so that the lifetime of the polarizing plate may be increased. Furthermore, the display quality of a display panel and a display device having the polarizing plate may be enhanced.

Claims

1. A polarizing plate comprising:

a base layer;

a buffer layer formed on the base layer; and

a plurality of conductive lattice lines formed on the buffer layer in a stripe shape, the conductive lattice lines reflecting and polarizing incident light, wherein the buffer layer protect the conductive lines.

2. The polarizing plate of claim 1, wherein the conductive lattice lines comprise a silver layer or an aluminum layer.

3. The polarizing plate of claim 2, wherein the buffer layer comprises a metal layer.

4. The polarizing plate of claim 3, wherein the metal layer comprises at least one of a titanium layer, a tungsten layer, a niobium layer, a tantalum layer, a vanadium layer, and a chromium layer.

5. The polarizing plate of claim 2, wherein the buffer layer comprises an organic material layer.

6. The polarizing plate of claim 5, wherein the organic material layer comprises at least one of a silicon oxide layer, a silicon nitride layer, a thermosetting resin layer, and a light curable resin layer.

7. The polarizing plate of claim 2, wherein the buffer layer comprises a chromium oxide layer.

8. The polarizing plate of claim 2, wherein the buffer layer comprises a metal layer and an organic layer formed on the metal layer.

9. The polarizing plate of claim 2, wherein the buffer layer is patterned along the conductive lattice lines.

10. The polarizing plate of claim 2, wherein the buffer layer is substantially fully formed on the base layer.

11. The polarizing plate of claim 10, wherein the buffer layer has a thickness of about 0.1 nm to about 10 nm.

12. The polarizing plate of claim 1, wherein a pitch between the conductive lattice lines, a width of the conductive lattice lines and a thickness of the conductive lattice lines are about 100 nm to about 200 nm, about 50 nm to about 100 nm, and about 150 nm to about 250 nm, respectively.

13. A display panel comprising:

an array substrate having a plurality of pixel parts formed thereon;

an opposite substrate having a plurality of color filter parts facing the pixel parts;

a liquid crystal layer interposed between the array substrate and the opposite substrate; and

a first polarizing part comprising first conductive lattice lines and a first buffer layer, the first conductive lattice lines formed on the array substrate in a stripe shape to reflect and polarize incident light, the first buffer layer formed between the array substrate and the first conductive lattice lines to protect the first conductive lattice lines.

14. The display panel of claim 13, wherein the first conductive lattice lines are formed on a lower surface of the array substrate, and the first buffer layer is disposed between the lower surface of the array substrate and the first conductive lattice lines.

15. The display panel of claim 13, wherein the first conductive lattice lines are formed on an upper surface of the array substrate, and the first buffer layer is disposed between the upper surface of the array substrate and the first conductive lattice lines.

16. The display panel of claim 13, further comprising a second polarizing part including:

second conductive lattice lines formed on the opposite substrate in a stripe shape to reflect and polarize incident light; and

a second buffer layer disposed between the opposite substrate and the second conductive lattice lines to protect the second conductive lattice lines.

17. The display panel of claim 16, wherein the second conductive lattice lines are formed on an upper surface of the opposite substrate, and the second buffer layer is disposed between the upper surface of the opposite substrate and the second conductive lattice lines.

18. The display panel of claim 16, wherein the second conductive lattice lines are formed on a lower surface of the opposite substrate, and the second buffer layer is disposed between the lower surface of the opposite substrate and the second conductive lattice lines.

19. A display device comprising:

a display panel comprising an array substrate having a plurality of pixel parts formed thereon, an opposite substrate having a plurality of color filter parts facing the pixel parts, and a liquid crystal layer interposed between the array substrate and the opposite substrate;

a backlight section providing the array substrate with light; and

a first polarizing plate comprising a first base layer disposed between the backlight part and the array substrate, a plurality of first conductive lattice lines formed on the first base layer, and a first buffer layer formed between the first base layer and the first conductive lattice lines to protect the first conductive lattice lines.

20. The display device of claim 19, further comprising a second polarizing plate including:

a second base layer disposed on the opposite substrate;

a plurality of second conductive lattice lines formed on the second base layer; and

a second buffer layer disposed between the second base layer and the second conductive lattice lines to protect the second conductive lattice lines.