Brightness enhancement film for liquid crystal display and manufacturing method thereof

• US 20050275334A1
• Filed: 04/26/2005
• Published: 12/15/2005
• Est. Priority Date: 04/27/2004
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Jong-Dae, Choi, Jin-Sung, Hwang, Jin-Taek
• Granted Patent: US 7,572,490 B2
• Time in Patent Office: Days
• US Class Current: 313/495
• CPC Class Codes: B29D 11/00278 Lenticular sheets B29D11/00269 takes precedence
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: G02B 5/02 Diffusing elements; Afocal elements
• CPC Class Codes: G02F 1/133507 Films for enhancing the luminance

Abstract

A liquid crystal display having a brightness enhancement film and a method of manufacturing the brightness enhancement film, the method including providing a solution of high molecular weight resin on a high molecular weight film, uniformly distributing the solution of high molecular weight resin on the high molecular weight film, and drying the solution of high molecular weight resin to form a high molecular weight resin layer, wherein the high molecular weight resin layer has a hexagonal lattice structure.

Claims

1. A method of manufacturing a brightness enhancement film for a liquid crystal display comprising:

providing a solution of high molecular weight resin on a high molecular weight film;

uniformly distributing the solution of high molecular weight resin on the high molecular weight film; and

drying the solution of high molecular weight resin to form a high molecular weight resin layer,

wherein the high molecular weight resin layer has a hexagonal lattice structure.

2. The method of claim 1, further comprising drawing the high molecular weight film and the high molecular weight resin layer in a predetermined direction with heating.

3. The method of claim 1, wherein the high molecular weight film comprises a polycarbonate or a poly ethylene terephthalate material.

4. The method of claim 1, wherein the hexagonal lattice structure of the high molecular weight resin layer is approximately 10 nm to 800 nm thick.

5. The method of claim 1, wherein the solution of the high molecular weight resin is uniformly applied by a spin coating process or blading process.

6. The method of claim 1, wherein the high molecular weight resin layer comprises one of a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

7. The method of claim 2, wherein the drawing of the high molecular weight film is performed at a temperature between a glass transition temperature of the high molecular weight film and a temperature that is greater than the glass transition temperature of the high molecular weight film by approximately 100°

Celsius.

8. The method of claim 2, wherein the high molecular weight film and the high molecular weight resin layer are each elongated between approximately 1.1 to 8 times through the drawing with heating.

9. A brightness enhancement film for a liquid crystal display comprising:

a high molecular weight film; and

a high molecular weight resin layer formed on the high molecular weight film,

wherein the high molecular weight resin layer has a hexagonal lattice structure.

10. The brightness enhancement film of claim 9, wherein both the high molecular weight film and the high molecular weight resin layer are drawn in a predetermined direction with heating.

11. The brightness enhancement film display of claim 9, wherein the high molecular weight film comprises a polycarbonate or a poly ethylene terephthalate material.

12. The brightness enhancement film for a liquid crystal display of claim 9, wherein the hexagonal lattice structure of the high molecular weight resin layer is approximately 10 nm to 800 nm thick.

13. The brightness enhancement film of claim 9, wherein the high molecular weight resin layer comprises one of a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

14. A method of manufacturing a liquid crystal display comprising:

providing a first UV cross-linker on a diffusion film;

uniformly distributing the first UV cross-linker on the diffusion film;

disposing a brightness enhancement film on the first UV cross-linker;

providing a second UV cross-linker on the brightness enhancement film;

uniformly distributing the second UV cross-linker on the brightness enhancement film;

disposing a prism film on the second UV cross-linker; and

illuminating a UV ray at the first and second UV cross-linkers,

wherein the brightness enhancement film has a high molecular weight film and a high molecular weight resin layer formed on the high molecular weight film, the high molecular weight film having a hexagonal lattice structure.

15. The method of claim 14, further comprising:

uniformly applying the first and second UV cross-linkers on the diffusion film and the brightness enhancement film, respectively, by a spin coating or blading technique.

16. A liquid crystal display comprising:

a display unit displaying images;

a back light unit providing light to the display unit; and

an optical film unit provided between the display unit, the optical film unit comprising a diffusion film, a prism film, and a brightness enhancement film,

wherein the brightness enhancement film has a high molecular weight film and a high molecular weight resin layer formed on the high molecular weight film, the high molecular weight resin layer having a hexagonal lattice structure.

17. The liquid crystal display of claim 16, wherein the brightness enhancement film is provided on the diffusion film and the prism film is provided on the brightness enhancement film.

18. The liquid crystal display of claim 17, further comprising:

a first UV cross-linker connecting together the diffusion film and the brightness enhancement film; and

a second UV cross-linker connecting together the brightness enhancement film and the prism film.

19. A method of manufacturing a brightness enhancement film for a liquid crystal display, comprising:

providing a plurality of photonic colloidal particles of a photonic colloid on a high molecular weight film; and

forming a photonic colloidal layer by fixing the photonic colloidal particles on the high molecular weight film,

wherein the deposited photonic colloidal particles form a predetermined lattice structure.

20. The method of claim 19, wherein the predetermined lattice structure of the deposited photonic colloidal particles is (111) or (100).

21. The method of claim 19, wherein the photonic colloid is manufactured by a method comprising:

inputting deionized water, a surfactant, and a neutralizer into a reactor;

agitating the deionized water, surfactant, and neutralizer;

inputting a styrene monomer into the reactor; and

inputting an initiator into the reactor.

22. The method of claim 19, wherein depositing the plurality of photonic colloidal particles of the photonic colloid on the high molecular weight film comprises:

putting a substrate having the high molecular weight film into the photonic colloid; and

drying the high molecular weight film having the photonic colloid.

23. The method of claim 19, further comprising:

forming another high molecular weight film and subsequently forming another photonic colloidal layer to form multiple brightness enhancement films.

24. The method of claim 19, wherein the photonic colloidal particle is several nanometers to several hundreds nanometers in size.

25. The method of claim 19, wherein the high molecular weight film comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polyamide, a polyether, a polysulfone, a polypropylene, a polymethylmethacrylate, a polypropylene, a acetylcellulose, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

26. A brightness enhancement film for a liquid crystal display, comprising:

a high molecular weight film; and

a photonic colloidal layer formed on the high molecular weight film,

wherein photonic colloidal particles of the photonic colloidal layer form a predetermined lattice structure.

27. The brightness enhancement film of claim 26, wherein the predetermined lattice structure of the photonic colloidal particles is (111) or (100).

28. The brightness enhancement film of claim 26, wherein the high molecular weight film comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polyamide, a polyether, a polysulfone, a polypropylene, a polymethylmethacrylate, a polypropylene, a acetylcellulose, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

29. The brightness enhancement film of claim 26, wherein the photonic colloidal particle is several nanometers to several hundreds nanometers in size.

30. A method of manufacturing a liquid crystal display comprising:

providing a first UV cross-linker on a diffusion film;

uniformly distributing the first UV cross-linker on the diffusion film;

disposing a brightness enhancement film on the first UV cross-linker;

providing a second UV cross-linker on the brightness enhancement film;

uniformly distributing the second UV cross-linker on the brightness enhancement film;

providing a prism film on the second UV cross-linker; and

illuminating a UV ray at the first and second UV cross-linkers,

wherein the brightness enhancement film has a high molecular weight film and a photonic colloidal layer formed on the high molecular weight film, and wherein photonic colloidal particles of the photonic colloidal layer form a predetermined lattice structure.

31. The method of claim 30, further comprising:

uniformly applying the first and second UV cross-linkers on the diffusion film and the brightness enhancement film, respectively, by a spin coating technique or a blading technique.

32. A liquid crystal display, comprising:

a display unit displaying images;

a back light unit providing light to the display unit; and

an optical film unit provided between the display unit and the back light unit, the optical film unit comprising a diffusion film, a prism film, and a brightness enhancement film,

wherein the brightness enhancement film has a high molecular weight film and a photonic colloidal layer formed on the high molecular weight film, and wherein photonic colloidal particles of the photonic colloidal layer form a predetermined lattice structure.

33. The liquid crystal display of claim 32, wherein the brightness enhancement film is provided on the diffusion film and the prism film is provided on the brightness enhancement film.

34. The liquid crystal display of claim 32, wherein the brightness enhancement film is several micrometers to several millimeters thick.

35. A method of manufacturing a brightness enhancement film for a liquid crystal display comprising:

providing a high molecular solution having metal ions on a substrate;

uniformly distributing the high molecular solution on the substrate; and

drying the high molecular solution to form a high molecular weight film such that the metal ions form a predetermined lattice structure.

36. The method of claim 35, wherein the high molecular solution comprises metal ions of AgCl or CuCl₂ and a high molecular weight resin having an acid radical.

37. The method of claim 36, wherein the high molecular weight resin comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

38. The method of claim 35, further comprising:

drawing the high molecular weight film in a predetermined direction with heating.

39. The method of claim 38, wherein the drawing of the high molecular weight film is performed at a temperature between the glass transition temperature of the high molecular weight film and a temperature that is greater than the glass transition temperature of the high molecular film by approximately 100°

Celsius.

40. The method of claim 38, wherein the high molecular weight film is elongated between approximately by 1.1 and 8 times through the drawing with heating.

41. A method of manufacturing a brightness enhancement film for a liquid crystal display, comprising:

melting a high molecular weight resin and metal particles;

cooling the melted high molecular weight resin and the metal particles using a cooling roll and forming a high molecular weight film,

wherein the metal particles distributed in the high molecular weight film form a predetermined lattice structure.

42. The method of claim 41, wherein the high molecular weight resin is comprises of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

43. The method of claim 41, wherein the metal particles distributed in the high molecular weight film are Au or Ag particles and the metal particle form a face centered cubic lattice structure.

44. The method of claim 41, wherein the high molecular weight resin and the metal particles are a powder-type material before the melting.

45. The method of claim 41, wherein the melting of the high molecular weight resin and the metal particles is performed at a temperature between the glass transition temperature of the high molecular weight film and, a temperature that is greater than the glass transition temperature of the high molecular film by approximately 180°

Celsius.

46. The method of claim 41, wherein the temperature of the cooling roll is between approximately 100°

Celsius to 140°

Celsius.

47. The method of claim 41, wherein a concentration of the high molecular weight resin is between approximately 70 wt % and 99.9 wt % and a concentration of the metal particles is between approximately 0.1 wt % and 30 wt %.

48. The method of claim 41, further comprising:

drawing the high molecular weight film in a predetermined direction with heating.

49. The method of claim 48, wherein the drawing of the high molecular weight film is performed at a temperature between a glass transition temperature of the high molecular weight film and a temperature that is greater than the glass transition temperature of the high molecular film by approximately 100°

Celsius.

50. The method of claim 48, wherein the high molecular weight film is extended by approximately 1.1 to 8 times through the drawing with heating.

51. A brightness enhancement film for a liquid crystal display comprising a high molecular weight film structure including a predetermined lattice formed by a plurality of metal particles or a plurality of metal ion particles.

52. The brightness enhancement film of claim 51, wherein the high molecular weight film is drawn in a predetermined direction with heating.

53. The brightness enhancement film of claim 51, wherein the high molecular weight film comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

54. The brightness enhancement film of claim 51, wherein the metal particles and/or the metal ion particles are Au, Ag, or Cu.

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

providing a first UV cross-linker on a diffusion film;

uniformly distributing the first UV cross-linker on the diffusion film;

providing a brightness enhancement film on the first UV cross-linker;

providing a second UV cross-linker on the brightness enhancement film;

uniformly distributing the second UV cross-linker on the brightness enhancement film;

providing a prism film on the second UV cross-linker; and

illuminating a UV ray at the first and second UV cross-linkers,

wherein the brightness enhancement film has a high molecular weight film structure comprising a plurality of metal particles forming a predetermined lattice or a plurality of metal ion particles.

56. The method of claim 55, further comprising:

uniformly applying the first and second UV cross-linkers on the diffusion film and the brightness enhancement film, respectively, by a spin coating technique or a blading technique.

57. A liquid crystal display comprising:

a display unit displaying images;

a back light unit providing light to the display unit; and

an optical film unit provided between the display unit and the back light unit and comprising a diffusion film, a prism film, and a brightness enhancement film,

wherein the brightness enhancement film has a structure of a high molecular weight film comprising a predetermined lattice formed by a plurality of metal particles or a plurality of metal ion particles.

58. The liquid crystal display of claim 57, wherein the brightness enhancement film is provided on the diffusion film and the prism film is provided on the brightness enhancement film.

59. The liquid crystal display of claim 57, further comprising:

a first UV cross-linker bonding the diffusion film and the brightness enhancement film; and

a second UV cross-linker bonding the brightness enhancement film and the prism film.

60. A method of manufacturing a brightness enhancement film for a liquid crystal display, comprising:

coating a liquid crystal material having a plurality of encapsulated liquid crystal molecules on a high molecular weight film; and

forming a liquid crystal layer by positioning the encapsulated liquid crystal molecules in a predetermined direction,

wherein the encapsulated liquid crystal molecules have a micelle structure.

61. The method of claim 60, wherein each of the encapsulated liquid crystal molecules is several tens of nanometers to several hundreds of nanometers in size.

62. The method of claim 60, wherein the encapsulated liquid crystal is manufactured by a method comprising:

putting deionized water and a surfactant into a reactor and agitating the deionized water and the surfactant;

putting a styrene monomer, a smectic liquid crystal, and an initiator into the reactor having the agitated deionized water and the agitating surfactant.

63. The method of claim 60, wherein the encapsulated liquid crystals have a colloid structure.

64. The method of claim 60, wherein the encapsulated liquid crystal molecules are positioned in the predetermined direction by rubbing and/or applying an electric field.

65. The method of claim 60, wherein the high molecular weight film comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a s derivative thereof.

66. The method of claim 60, further comprising:

drawing the high molecular weight film and the liquid crystal layer in a predetermined direction with heating.

67. The method of claim 66, wherein the drawing of the high molecular weight film and the liquid crystal layer are performed at a temperature between the glass transition temperature of the high molecular weight film and, a temperature that is greater than the glass transition temperature of the high molecular weight film by approximately 100°

Celsius.

68. The method of claim 66, wherein the high molecular weight film and the liquid crystal layer are extended by approximately 1.1 to 8 times through the drawing with heating.

69. A brightness enhancement film for a liquid crystal display comprising:

a high molecular weight film; and

a liquid crystal layer formed on the high molecular weight film,

wherein the liquid crystal layer comprises a plurality of encapsulated liquid crystal molecules having a micelle structure and positioned in a predetermined direction.

70. The brightness enhancement film of claim 69, wherein the high molecular weight film and the encapsulated liquid crystal layer in a predetermined direction with heating.

71. The brightness enhancement film of claim 69, wherein the high molecular weight film comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

72. The brightness enhancement film of claim 69, wherein each of the encapsulated liquid crystal molecules is several tens of nanometers to several hundreds of nanometers in size.

73. A method of manufacturing a liquid crystal display comprising:

providing a first UV cross-linker on a diffusion film;

uniformly distributing the first UV cross-linker on the diffusion film;

providing a brightness enhancement film on the first UV cross-linker;

providing a second UV cross-linker on the brightness enhancement film;

uniformly distributing the second UV cross-linker on the brightness enhancement film;

providing a prism film on the second UV cross-linker; and

illuminating a UV ray at the first and second UV cross-linkers,

wherein the brightness enhancement film has a high molecular weight film and a liquid crystal layer comprising a plurality of encapsulated liquid crystal molecules having a micelle structure and positioned in a predetermined direction.

74. The method of claim 73, further comprising:

uniformly applying the first and second UV cross-linkers on the diffusion film and the

brightness enhancement film, respectively, by a spin coating technique or a blading technique.

75. The method of claim 73, further comprising:

providing another brightness enhancement film on the liquid crystal display.

76. A liquid crystal display comprising:

a display unit displaying images;

a back light unit providing light to the display unit; and

an optical film unit provided between the display unit and the back light unit, the optical film unit comprising a diffusion film, a prism film, and a brightness enhancement film,

wherein the brightness enhancement film has a high molecular weight film and a liquid crystal layer formed on the high molecular weight film, and

wherein the liquid crystal layer comprises a plurality of encapsulated liquid crystal molecules having a micelle structure and positioned in a predetermined direction.

77. The liquid crystal display of claim 76, wherein the brightness enhancement film is provided on the diffusion film and the prism film is provided on the brightness enhancement film.

78. The liquid crystal display of claim 77, further comprising:

a first UV cross-linker connecting together the diffusion film and the brightness enhancement film; and

a second UV cross-linker connecting together the brightness enhancement film and the prism film.

79. A method of manufacturing a brightness enhancement film for a liquid crystal display, comprising:

melting a high molecular weight resin and organic particles having a core shell structure;

cooling the melted high molecular weight resin and the organic particles with a cooling roll to form a high molecular weight film; and

drawing the high molecular weight film in a predetermined direction with heating.

80. The method of claim 79, wherein the organic particles are made of methacylate butadiene styrene.

81. The method of claim 79, wherein the high molecular weight resin comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

82. The method of claim 80, wherein the high molecular weight resin and the organic particles have a powder type structure before the melting, and

wherein the melting of the high molecular weight resin and the organic particles is performed at a temperature between the glass transition temperature of the high molecular s weight film and a temperature that is greater than the glass transition temperature of the high molecular weight film by approximately 180°

Celsius.

83. The method of claim 82, wherein the glass transition temperature of the high molecular weight film ranges from between approximately 300°

Celsius to 330°

Celsius.

84. The method of claim 79, wherein the temperature of the cooling roll ranges from between approximately 100°

Celsius to 140°

Celsius.

85. The method of claim 79, wherein a concentration of the high molecular weight resin is between approximately 70 wt % and 99 wt % and a concentration of the organic particles is between approximately 1 wt % and 30 wt %.

86. The method of claim 79, wherein the drawing of the high molecular weight film is performed at a temperature between the glass transition temperature of the high molecular weight film and a temperature that is greater than the glass transition temperature of the high molecular weight film by approximately 100°

Celsius.

87. The method of claim 79, wherein the high molecular weight film is extended by approximately 1.1 to 8 times through the drawing with heating.

88. A brightness enhancement film for a liquid crystal display comprises a high molecular weight film and organic particles having a core shell structure and distributed in the high molecular weight film.

89. The brightness enhancement film of claim 88, wherein the high molecular weight film is drawn in a predetermined direction.

90. The brightness enhancement film of claim 88, wherein the high molecular weight film comprises one of a polycarbonate, a poly ethylene terephthalate, a polyimide, a polysulfone, a polymethylmethacrylate, a polystyrene, a polyvinylchloride, a polyvinylalcohol, a polynorbonene, a polymer formed by copolymerization of the above identified polymers, or a derivative thereof.

91. The brightness enhancement film of claim 88, wherein the organic particles are comprises methacylate butadiene styrene.

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

providing a first UV cross-linker on a diffusion film;

uniformly distributing the first UV cross-linker on the diffusion film;

providing a brightness enhancement film on the first UV cross-linker;

providing a second UV cross-linker on the brightness enhancement film;

uniformly distributing the second UV cross-linker on the brightness enhancement film;

providing a prism film on the second UV cross-linker; and

illuminating a UV ray at the first and second UV cross-linkers,

wherein the brightness enhancement film comprises a high molecular weight film and organic particles having a core shell structure and distributed in the high molecular weight film.

93. The method of claim 92, further comprising:

uniformly applying the first and second UV cross-linkers on the diffusion film and the brightness enhancement film, respectively, by a spin coating technique or a blading technique.

94. A liquid crystal display, comprising:

a display unit displaying images;

a back light unit providing light to the display unit; and

an optical film unit provided between the display unit and the back light unit, the optical film unit comprising a diffusion film, a prism film, and a brightness enhancement film,

wherein the brightness enhancement film comprises a high molecular weight film and organic particles having a core shell structure and distributed in the high molecular weight film.

95. The liquid crystal display of claim 94, wherein the brightness enhancement film is provided on the diffusion film and the prism film is provided on the brightness enhancement film.

96. The liquid crystal display of claim 94, further comprising:

a first UV cross-linker connecting together the diffusion film and the brightness enhancement film; and

a second UV cross-linker connecting together the brightness enhancement film and the prism film.