Color correcting polarizer

• US 7,144,608 B2
• Filed: 06/18/2003
• Issued: 12/05/2006
• Est. Priority Date: 01/24/2003
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Paukshto, Michael V., Silverstein, Louis D.
• Primary Examiner(s): Dye, Rena
• Assistant Examiner(s): HON, SOW FUN
• Application Number:
  US10/465,083
• Publication Number:
  US 20040146663A1
• Time in Patent Office: 1,266 Days
• Field of Search: 428/1.1, 428/1.3, 428/1.31, 349/94, 349 96- 97, 349/104, 349/106, 353/84, 252/299.62, 252/299.01, 544342-343, 544/353
• US Class Current: 428/1.31
• CPC Class Codes: C09K 19/3452 Pyrazine
• CPC Class Codes: C09K 19/60 Pleochroic dyes
• CPC Class Codes: C09K 2323/031 Polarizer or dye
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528
• CPC Class Codes: G02F 1/133528 Polarisers

Abstract

A color-correcting polarizer is provided comprising a polarizer layer and at least one discotic film layer. The discotic film layer is optically transparent within the range of visible wavelength. The discotic film layer works as a polarizer in the wavelength ranges at least from 380 to 500 nm and/or from 600 to 780 nm. A liquid crystal cell comprising the color correcting polarizer is also disclosed.

Claims

1. A color correcting polarizer comprising:

a polarizer layer; and

at least one discotic film layer,

wherein the polarizer layer is an O-type polarizer, and

the discotic film layer is optically transparent within the range of visible wavelength, and works as a polarizer in the wavelength range at least from 380 to 500 nm,

wherein the discotic film layer is formed from a lyotropic liquid crystal based on discotic dichroic dye molecules, and

the discotic film layer is made of the sulfonic derivatives of phenanthro-9′

, 10′

;

2,3 quinoxaline of the general structural formula

2. The color correcting polarizer according to claim 1, wherein the polarizer layer and the at least, one discotic film layer have parallel or perpendicular transmission axes.

3. The color correcting polarizer according to claim 1, wherein the discotic film layer works as an E-type polarizer.

4. The color correcting polarizer according to claim 3, wherein the E-type polarizer layer has negative birefringence.

5. The color correcting polarizer according to claim 1, wherein the discotic film layer is a thin crystal film polarizer.

6. The color correcting polarizer according to claim 1, wherein the polarizer layer is a thin crystal film polarizer.

7. The color correcting polarizer according to claim 1 further comprises at least one layer of an adhesive material and at least one substrate.

8. The color correcting polarizer according to claim 7, wherein the substrate is birefringent.

9. The color correcting polarizer according to claim 7, wherein the substrate is non-birefringent.

10. The color correcting polarizer according to claim 1, further comprises a protective layer.

11. The color correcting polarizer according to claim 1, further comprises an antireflective layer.

12. The color correcting polarizer according to claim 1, further comprises an antiglare layer.

13. A liquid crystal cell comprising:

a front panel;

a rear panel;

liquid crystal layer placed between the front and rear panels; and

a color correcting polarizer, wherein

the color correcting polarizer comprises at least one polarizer layer and at least one discotic film layer, wherein the at least one polarizer layer is an O-type polarizer and the at least one dicotic film layer is optically layer is 0-type polarizer and said discotic film layer is optically transparent within the range of visible wavelength and works as a polarizer in the wavelength range at least from 380 to 500 nm,

wherein the at least one discotic film layer is formed from a lyotropic liquid crystal based on discotic from a lyotropic liquid crystal based on discotic dichroic dye molecules, and

is made of the sulfonic derivatives of phenathro-9′

, 10′

;

2,3-quinoxaline of the general structural formula

14. The liquid crystal cell according to claim 13, wherein the at least one polarizer layer and the at least one discotic film layer have parallel or perpendicular transmission axes.

15. The liquid crystal cell according to claim 13, wherein the at least one discotic film layer is also a polarizer in the visible wavelength range.

16. The liquid crystal cell according to claim 15, wherein the at least one discotic film layer has the predetermined transmission spectrum which is a combination of spectra of a neutral polarizer and a color correcting polarizer.

17. The liquid crystal cell according to claim 13, wherein the O-type polarizer is an iodine-based polymer polarizer.

18. The liquid cell according to claim 13, wherein the color correcting polarizer further comprises at least one polarizer layer which is an E-type polarizer.

19. The liquid crystal cell according to claim 18, wherein the E-type polarizer is formed from a lyotropic crystal based on discotic dichroic dye molecules.

20. The liquid crystal cell according to claim 13, wherein the at least one discotic film layer works as an E-type polarizer.

21. The liquid crystal cell according to claim 20, wherein the E-type polarizer layer has negative birefringence.

22. The liquid crystal cell according to claim 13, wherein the at least one discotic film layer is a thin crystal film polarizer.

23. The liquid crystal cell according to claim 13, wherein the at least one polarizer layer is a thin crystal film.

24. The liquid crystal cell according to claim 13, further comprises an antiglare or antireflection coating placed onto an outer surface of the liquid crystal cell.

25. The liquid crystal cell according to claim 13, further comprises a reflective layer.

26. The liquid crystal cell according to claim 25, wherein at least part of the reflective layer possesses specular reflective properties.

27. The liquid crystal cell according to claim 25, wherein at least part of the reflective layer possesses diffusive reflective properties.

28. The liquid crystal cell according to claim 25, wherein at least part of the reflective layer is transmissive.

29. The liquid crystal cell according to claim 13, wherein the at least one discotic film layer functions as a retarder, a color filter, or a combination thereof.

30. The liquid crystal cell according to claim 13, wherein the discotic film layer is applied onto the polarizer on a side proximate to the liquid crystal layer.

31. A color correcting polarizer comprising:

a polarizer layer; and

at least one discotic film layer,

wherein the polarizer layer is O-type polarizer, and

the at least one discotic film layer is optionally transparent within the range of visible wavelength, and works as a polarizer in the wavelength range at least from 380 to 500 nm

the discotic film layer is formed from a lyotropic liquid crystal based on discotic dichroic dye molecules, and

is made of a sulfonic derivative of phenanthro-9′

, 10′

;

2,3-quinoxaline of at least one of the structural formulas I–

VII;

32. The color correcting polarizer according to claim 31, wherein the polarizer layer and the at least one discotic film layer have parallel or perpendicular transmission axes.

33. The color correcting polarizer according to claim 31, wherein the at least one discotic film layer works as an E-type polarizer.

34. The color correcting polarizer according to claim 33, wherein the E-type polarizer layer has negative birefringence.

35. The color correcting polarizer according to claim 31, wherein the at least one discotic film layer is a thin crystal film polarizer.

36. The color correcting polarizer according to claim 31, wherein the polarizer layer is a thin crystal film polarizer.

37. The color correcting polarizer according to claim 31, further comprises at least one layer of an adhesive material and at least one substrate.

38. The color correcting polarizer according to claim 37, wherein the substrate is birefringent.

39. The color correcting polarizer according to claim 37, wherein the substrate is birefringent.

40. The color correcting polarizer according to claim 31, further comprises a protective layer.

41. The color correcting polarizer according to claim 31, further comprises an antireflective layer.

42. The color correcting polarizer according to claim 31, further comprises an antiglare layer.

43. A liquid crystal cell comprising:

a front panel;

a rear panel;

liquid crystal placed between the front and rear panels; and

a color correcting polarizer;

wherein

the color correcting polarizer comprises at least one polarizer layer and at least one discotic film layer, the at least one polarizer layer is an O-type polarizer and the at least one discotic film layer is optionally transparent within the visible wavelength range and works as a polarizer in the wavelength range of at least from 380–

500 nm,

wherein the discotic film layer is formed from a lyotropic liquid crystal based on discotic dichroic dye molecules, and

is made of a sulfonic derivative of pehnanthro-9′

, 10′

;

2,3-quinoxaline of a least one of the structural formulas I–

VIII;

44. The liquid crystal cell according to claim 43, wherein the at least one polarizer layer and at least one discotic film layer have parallel or perpendicular transmission axes.

45. The liquid crystal cell according to claim 43, wherein the at least one discotic film polarizer layer is also a polarizer in the visible wavelength range.

46. The liquid crystal cell according to claim 45, wherein the at least one discotic film layer has the predetermined transmission spectrum which is a combination of spectra of a neutral polarizer and a color correcting polarizer.

47. The liquid crystal cell according to claim 43, wherein the O-type polarizer is an iodine-based polymer polarizer.

48. The liquid crystal cell according to claim 43, wherein the color correcting polarizer further comprises at least one polarizer layer which is an E-Type polarizer.

49. The liquid crystal cell according to claim 48, wherein the E-type polarizer is formed from a lyotropic crystal based on discotic dichroic dye molecules.

50. The liquid crystal cell according to claim 43, wherein the at least one discotic film layer works as an E-type polarizer.

51. The liquid crystal cell according to claim 50, wherein the E-type polarizer layer has negative birefringence.

52. The liquid crystal cell according to claim 43, wherein the at least one discotic film is a thin crystal film polarizer.

53. The liquid crystal cell according to claim 43, wherein the at least one polarizer layer is a thin crystal film.

54. The liquid crystal cell according to claim 43, further comprises an antiglare or antireflection coating placed onto an outer surface of the liquid crystal cell.

55. The liquid crystal cell according to claim 43, further comprises a reflective layer.

56. The liquid crystal cell according to claim 55, wherein at least part of the reflective layer possesses specular reflective properties.

57. The liquid crystal cell according to claim 55, wherein at least part of the reflective layer possesses diffusive reflective properties.

58. The liquid crystal cell according to claim 55, wherein at least part of the reflective layer is transmissive.

59. The liquid crystal cell according to claim 43, wherein the at least one discotic film layer functions as a retarder, or a color filter, or a combination of thereof.

60. The liquid crystal cell according to claim 43, wherein the at least one discotic film layer is applied onto the polarizer inside the cell.