Polarizer and liquid crystal display including the same

• US 9,964,798 B2
• Filed: 08/03/2015
• Issued: 05/08/2018
• Est. Priority Date: 11/20/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Ki, Boo-Kan, Na, Gwan Young, Do, Hee Wook, Kim, Kwang-Hyun, Kim, Dae Won, Kim, Teck Soo, Park, Seung Beom, Suh, Duck Jong, Shin, Na Young, Lee, Sang-Gu, Kim, Ji-Hoon
• Primary Examiner(s): Kim, Richard
• Application Number:
  US14/816,121
• Publication Number:
  US 20150338703A1
• Time in Patent Office: 1,009 Days
• Field of Search: None
• CPC Class Codes: G02B 5/205 Neutral density filters
• CPC Class Codes: G02B 5/3041 comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: G02B 5/305 including organic materials, e.g. polymeric layers
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/133545 Dielectric stack polarisers
• CPC Class Codes: G02F 1/133634 the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis

Abstract

A polarizer includes a first laminated structure having a first layer with a first refractive index and a second layer with a second refractive index, wherein the first and second refractive indices are different from each other. A buffer layer is disposed on the first laminated structure. A second laminated structure in the polarizer has a third layer with a third refractive index and a fourth layer with a fourth refractive index, wherein the third and fourth refractive indices are different from each other.

Claims

1. A polarizer, comprising:

a first laminated structure comprising a first layer having a first refractive index and a second layer having a second refractive index, wherein the first and second refractive indices are different from each other;

a second laminated structure disposed on the first laminated structure, the second laminated structure comprising a third layer having a third refractive index and a fourth layer having a fourth refractive index, wherein the third and fourth refractive indices are different from each other; and

a buffer layer disposed between the first laminated structure and the second laminated structure.

2. The polarizer of claim 1, wherein the first refractive index is substantially the same as the third refractive index.

3. The polarizer of claim 2, wherein the second refractive index is substantially the same as the fourth refractive index.

4. The polarizer of claim 3, wherein the first layer and the third layer comprise a first material, and the second layer and the fourth layer comprise a second material, and

wherein a component ratio of the first material of the first layer to the second material of the second layer is different from a component ratio of the first material of the third layer to the second material of the fourth layer.

5. The polarizer of claim 3, wherein a thickness ratio of the first layer to the second layer is different from a thickness ratio of the third layer to the fourth layer.

6. The polarizer of claim 5, wherein the first layer and the third layer comprise the same material, and the second layer and the fourth layer comprise the same material.

7. The polarizer of claim 1, wherein the first layer and the third layer comprise a first material, and the second layer and the fourth layer comprise a second material, and

wherein a component ratio of the first material of the first layer to the second material of the second layer is different from a component ratio of the first material of the third layer to the second material of the fourth layer.

8. The polarizer of claim 1, wherein a thickness ratio of the first layer to the second layer is different from a thickness ratio of the third layer to the fourth layer.

9. The polarizer of claim 8, wherein the first layer and the third layer comprise the same material, and the second layer and the fourth layer comprise the same material.

10. The polarizer of claim 1, wherein the first layer and the third layer comprise different material from each other.

11. The polarizer of claim 1, wherein the second layer and the fourth layer comprise different material from each other.

12. A liquid crystal display, comprising:

a first panel comprising;

a first polarizer configured as an absorptive polarizer, and

a first insulation substrate;

a second panel comprising;

a second polarizer, and

a second insulation substrate;

a liquid crystal layer disposed between the first panel and the second panel; and

a backlight providing unit configured to supply light,

wherein the second panel is disposed on the backlight providing unit, and

wherein the second polarizer comprises;

a first laminated structure comprising a first layer having a first refractive index and a second layer having a second refractive index, wherein the first and second refractive indices are different from each other;

a second laminated structure disposed on the first laminated structure, the second laminated structure comprising a third layer having a third refractive index and a fourth layer having a fourth refractive index, wherein the third and fourth refractive indices are different from each other; and

a buffer layer disposed between the first laminated structure and the second laminated structure.

13. The polarizer of claim 12, wherein the first refractive index is substantially the same as the third refractive index.

14. The polarizer of claim 13, wherein the second refractive index is substantially the same as the fourth refractive index.

15. The polarizer of claim 14, wherein the first layer and the third layer comprise a first material, and the second layer and the fourth layer comprise a second material, and

wherein a component ratio of the first material of the first layer to the second material of the second layer is different from a component ratio of the first material of the third layer to the second material of the fourth layer.

16. The polarizer of claim 14, wherein a thickness ratio of the first layer to the second layer is different from a thickness ratio of the third layer to the fourth layer.

17. The polarizer of claim 16, wherein the first layer and the third layer comprise the same material, and the second layer and the fourth layer comprise the same material.

18. The polarizer of claim 12, wherein the first layer and the third layer comprise a first material, and the second layer and the fourth layer comprise a second material, and

wherein a component ratio of the first material of the first layer to the second material of the second layer is different from a component ratio of the first material of the third layer to the second material of the fourth layer.

19. The polarizer of claim 12, wherein a thickness ratio of the first layer to the second layer is different from a thickness ratio of the third layer to the fourth layer.

20. The polarizer of claim 19, wherein the first layer and the third layer comprise the same material, and the second layer and the fourth layer comprise the same material.

21. The polarizer of claim 12, wherein the first layer and the third layer comprise different material from each other.

22. The polarizer of claim 12, wherein the second layer and the fourth layer comprise different material from each other.