Polarization film, display apparatus including the same, and manufacturing method for the same

• US 10,436,961 B2
• Filed: 10/02/2015
• Issued: 10/08/2019
• Est. Priority Date: 10/13/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Jun Sung, Lee, Won Yong, Hwang, Ju Seong
• Primary Examiner(s): Chapel, Derek S.
• Application Number:
  US14/873,822
• Publication Number:
  US 20160124132A1
• Time in Patent Office: 1,467 Days
• Field of Search: None
• CPC Class Codes: G02B 27/288 Filters employing polarising elements, e.g. Lyot or Solc filters G02B5/3016 takes precedence
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• 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: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133533 Colour selective polarisers G02F1/1347 takes precedence
• 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 1/133562 on the viewer side

Abstract

A polarization film and a display apparatus are provided. The polarization film includes first polarization layers and second polarization layers. The first polarization layers have a first refractive index with respect to a first polarization; and the second polarization layers have a second refractive index with respect to the first polarization and are arranged in each interval between the first polarization layers. The first polarization layers reflect light of the first polarization having color coordinates based on a thickness of the first polarization layers, at a boundary that touches the second polarization layers. The display apparatus includes a display panel and the polarization film.

Claims

1. A polarization film comprising:

a plurality of first polarization layers that have a first refractive index with respect to a first polarization; and

a plurality of second polarization layers that have a second refractive index with respect to the first polarization and are arranged in each interval between the plurality of first polarization layers,

wherein the plurality of first polarization layers reflect light of the first polarization having color coordinates varying based only on a thickness variation of the first polarization layer, at a boundary that touches the plurality of second polarization layers.

2. The polarization film according to claim 1, wherein the plurality of first polarization layers reflect light of the first polarization except for light having a frequency component corresponding to the thickness.

3. The polarization film according to claim 2, wherein the plurality of first polarization layers reflect light of the first polarization having color coordinates that are determined according to the frequency component.

4. The polarization film according to claim 1, wherein the plurality of first polarization layers absorb light having a frequency component corresponding to the thickness of the first polarization layer from among light of the first polarization that is incident on the polarization film.

5. The polarization film according to claim 4, wherein, in the plurality of first polarization layers, the absorbed frequency of light of the first polarization decreases as the thickness of the first polarization layer increases.

6. The polarization film according to claim 1, wherein the plurality of first polarization layers have the second refractive index with respect to a second polarization perpendicular to the first polarization, and the plurality of second polarization layers have the second refractive index with respect to the second polarization.

7. The polarization film according to claim 6, wherein the plurality of first polarization layers and the plurality of second polarization layers transmit light of the second polarization through the polarization film.

8. The polarization film according to claim 1, wherein each of the plurality of first polarization layers is made of a birefringent material.

9. The polarization film according to claim 1, further comprising:

an adhesive layer that is provided on the polarization film to adhere the polarization film to a display panel for displaying an image comprising light of the second polarization,

wherein the second polarization is perpendicular to the first polarization.

10. A display apparatus comprising:

a display panel that displays an image comprising light of a second polarization; and

a polarization film that is disposed on an outside surface of the display panel in a direction of light transmission from the display panel, and that transmits light of the second polarization through the polarization film to provide the image,

wherein the polarization film comprises a plurality of first polarization layers and a plurality of second polarization layers laminated together, the first polarization layers having a different refractive index with respect to the first polarization than the second polarization layers, and

wherein, when light of a first polarization perpendicular to the second polarization is incident on the polarization film, the polarization film reflects the light of the first polarization having predetermined color coordinates varying based only on a thickness variation of the first polarization layer.

11. The display apparatus according to claim 10, wherein the polarization film projects a mirror image of an object by reflecting light of the first polarization, and

wherein the mirror image has the predetermined color coordinates.

12. The display apparatus according to claim 10, wherein the polarization film reflects light of the first polarization having the predetermined color coordinates at boundaries between the first and second layers.

13. The display apparatus according to claim 10, wherein each of the first layers and each of the second layers have a same refractive index with respect to the second polarization.

14. The display apparatus according to claim 10, wherein

the plurality of first polarization layers have a first refractive index with respect to the first polarization, and

the plurality of second polarization layers have a second refractive index with respect to the first polarization and are arranged in each interval between the plurality of first polarization layers, and

wherein the plurality of first polarization layers reflect light of the first polarization having color coordinates based on a thickness of the first polarization layers, at boundaries that touch the plurality of second polarization layers.

15. The display apparatus according to claim 14, wherein the plurality of first polarization layers reflect light of the first polarization except for light having a frequency component corresponding to the thickness of the first polarization layers.

16. The display apparatus according to claim 15, wherein the plurality of first polarization layers reflect light of the first polarization having color coordinates that are determined according to the frequency component.

17. The display apparatus according to claim 14, wherein the plurality of first polarization layers absorb light having a frequency component corresponding to the thickness of the first polarization layers from among light of the first polarization that is incident on the polarization film.

18. The display apparatus according to claim 17, wherein, in the plurality of first polarization layers, the absorbed frequency of light of the first polarization decreases as the thickness increases.

19. The display apparatus according to claim 14, wherein each of the plurality of first polarization layers and each of the plurality of second polarization layers have the second refractive index with respect to the second polarization.

20. The display apparatus according to claim 14, wherein each of the plurality of first polarization layers is made of a birefringent material.

21. The display apparatus according to claim 10, wherein the polarization film includes an adhesive layer that adheres the polarization film to the display panel.

22. A manufacturing method for a display apparatus comprising:

preparing a display panel that displays an image comprising light of a second polarization;

preparing a polarization film that transmits light of the second polarization through the polarization film, the polarization film includes a plurality of first polarization layers that have a first refractive index with respect to a first polarization and

a plurality of second polarization layers that have a second refractive index with respect to the first polarization and are arranged in each interval between the plurality of first polarization layers; and

adhering the polarization film to outside surface of the display panel on which the image of the display panel is displayed,

wherein the polarization film is prepared such that when light of a first polarization that is perpendicular to the second polarization is incident to the polarization film, the polarization film reflects the light of the first polarization that has predetermined color coordinates varying based only on a thickness variation of the first polarization layer.

23. The manufacturing method according to claim 22, wherein the preparing of the polarization film includes preparing the polarization film that projects a mirror image of an object by reflecting light of the first polarization, the mirror image having the predetermined color coordinates.

24. The manufacturing method according to claim 22, wherein the preparing of the polarization film includes repeatedly laminating two layers, each having a different refractive index with respect to the first polarization.

25. The manufacturing method according to claim 24, wherein the preparing of the polarization film includes preparing the polarization film that reflects light of the first polarization having the predetermined color coordinates at boundaries of the two layers.

26. The manufacturing method according to claim 24, wherein, each of the two layers have a same refractive index with respect to the second polarization.

27. The manufacturing method according to claim 22, wherein the preparing of the polarization film includes repeatedly laminating a first polarization layer having a first refractive index with respect to the first polarization, and a second polarization layer having a second refractive index with respect to the first polarization.

28. The manufacturing method according to claim 27, wherein the repeatedly laminating of the first polarization layer and the second polarization layer includes laminating the first polarization layers that have a thickness corresponding to the color coordinates so that light of the first polarization having the color coordinates is reflected.

29. The manufacturing method according to claim 28, wherein the laminating of the first polarization layer includes determining the thickness of the first polarization layer so that light of a frequency component determined by the color coordinates is removed from the reflected light of the first polarization.

30. The manufacturing method according to claim 27, wherein the repeatedly laminating of the first polarization layer and the second polarization layer includes laminating the first polarization layer and the second polarization layer having the second refractive index with respect to light of the second polarization so that the polarization film transmits light of the second polarization through the polarization film.

31. The manufacturing method according to claim 27, wherein the first polarization layer is made of a birefringent material.

32. The manufacturing method according to claim 22, wherein the preparing of the polarization film includes preparing an adhesive layer that adheres the polarization film to the display panel.

33. A display apparatus comprising:

a display panel; and

a polarization film provided on an outside surface of the display panel in a direction of transmission of light from the display panel,

wherein the polarization film comprises;

a first layer having a first refractive index at a first polarization and a second refractive index that is different from the first refractive index at a second polarization, and

a second layer having the second refractive index at the first polarization and at the second polarization,

wherein the first layer reflects light of the first polarization having color coordinates varying based only on a thickness variation of the first layer, at a boundary that touches the second layer.

34. The display apparatus according to claim 33, wherein the first layer is made of a birefringent material.

35. The display apparatus according to claim 34, wherein the second layer is made of a material having no birefringence.

36. The display apparatus according to claim 33, wherein the polarization film comprises a plurality of the first layers and a plurality of the second layers, the first layers alternating with the second layers.

37. The display apparatus according to claim 33, wherein the polarization film is adhered to the display panel with an adhesive layer.