Multilayer plate and display panel with anisotropic crystal film and conducting protective layer

• US 7,317,499 B2
• Filed: 04/04/2003
• Issued: 01/08/2008
• Est. Priority Date: 08/22/2002
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Paukshto, Michael V., Lazarev, Pavel I.
• Primary Examiner(s): SCHECHTER, ANDREW M
• Application Number:
  US10/407,450
• Publication Number:
  US 20040036817A1
• Time in Patent Office: 1,740 Days
• Field of Search: 349/96, 349/104, 349/122
• US Class Current: 349/96
• 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: C09K 2323/061 Inorganic, e.g. ceramic, metallic or glass
• CPC Class Codes: G02F 1/133509 Filters, e.g. light shielding masks
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G02F 1/1398 the twist being below 90°

Abstract

A multilayer plate is provided comprising an optically transparent substrate, a protective layer, a conducting layer, and at least one anisotropic thin crystal film. The anisotropic thin crystal film is made of a substance containing aromatic rings and possessing a structure with an interplanar spacing of 3.4±0.2 Å along one of optical axes. The thin crystal film is situated between the substrate and the conducting layer and is separated from the conducting layer by the protective layer. The transmission of the multilayer plate for UV radiation does not exceed 1% at any wavelength below 380 nm.

Claims

1. A multilayer plate comprising an optically transparent substrate, a protective layer, a conducting layer, and at least one anisotropic thin crystal film made of a substance containing aromatic rings and possessing a structure with an interplanar spacing of 3.4±

0.2Å

, along with one of optical axes,

wherein the at least one crystal film is situated between the substrate and the conducting layer and is separated from the conducting layer by the protective layer, and the substrate is made of a polymer or glass material transparent in the visible range and cutting off the UV radiation component, so that transmitting of the multilayer plate for UV radiation does not exceed 1% at any wavelength below 380 nm wherein the thin crystal film is a polarizer of the E type that simultaneously performs the functions of a polarizer and a phase-shifting layer; and

wherein at least a part of the protective layer is conducting.

2. The multilayer plate according to claim 1, wherein the substance of the crystal film contains heterocycles.

3. The multilayer plate according to claim 2, wherein the heterocycles are oriented so that their planes are perpendicular to the substrate plane.

4. The multilayer plate according to claim 1, wherein the substrate is made of a material absorbing UV radiation.

5. The multilayer plate according to claim 1, wherein the substrate is made of a colorless soda-lime glass.

6. The multilayer plate according to claim 5, wherein the colorless soda-lime glass contains additives of selenium oxide, iron oxide, cobalt oxide, and selenium.

7. The multilayer plate according to claim 5, wherein the colorless soda-lime glass contains additives of selenium oxide (0.1-10%), iron oxide (about 0.07%), cobalt oxide (0.000001-0.001%), and selenium (up to 0.08%).

8. The multilayer plate according to claim 1, wherein the substrate is made of a plastic.

9. The multilayer plate according to claim 1, further containing an additional reflecting layer.

10. The multilayer plate according to claim 9, wherein the reflecting layer is specular or diffusive.

11. The multilayer plate according to claim 10, wherein the reflecting layer is applied on the rear side of the substrate.

12. The multilayer plate according to claim 10, wherein the reflecting layer is applied on the front side of the substrate and there is a planarization layer between the reflecting layer and the thin crystal film.

13. The multilayer plate according to claim 1, further comprising transflecting layer.

14. The multilayer plate according to claim 13, wherein the transflecting layer is specular or diffusive.

15. The multilayer plate according to claim 14, wherein the transflecting layer is applied on the rear side of the substrate.

16. The multilayer plate according to claim 14, wherein the transflecting layer is applied on the front side of the substrate and there is a planarization layer between the transflecting layer and the thin crystal film.

17. The multilayer plate according to claim 1, wherein the protective layer is made of silicon dioxide and/or at least one heavy metal oxide or a polymer.

18. The multilayer plate according to claim 1, further comprising a layer absorbing UV radiation.

19. The multilayer plate according to claim 18, wherein the transmission in the visible spectral range is not less than 80%.

20. The multilayer plate according to claim 18, wherein the layer absorbing UV radiation comprises 4-alkoxy-2-hydroxyphenyl-s-triazin incorporated in a cellulose triacetate film.

21. The multilayer plate according to claim 18, wherein the layer absorbing UV radiation is applied either between any of the function layers.

22. The multilayer plate according to claim 18, wherein the layer absorbing UV radiation is applied outside the multilayer plate.

23. The multilayer plate according to claim 22, wherein the layer absorbing UV radiation is prepared to coat with a lacquer containing necessary additives and absorbing the UV radiation.

24. The multilayer plate according to claim 1, wherein the conducting layer is made of ITO.

25. The multilayer plate according to claim 24, wherein a metal grid is applied onto the conducting layer.

26. The multilayer plate according to claim 25, wherein the total area of the metal grid amounts to less than 10% of the total area of the multilayer plate.

27. The multilayer plate according to claim 1, wherein refractive indices of each layer in at least one spectral region, thicknesses of these layers, and their combination are selected so that the multilayer plate provides an interference extremum for at least one polarization of light in this spectral region.

28. The multilayer plate according to claim 1, further comprising at least one polymer coating.

29. A display panel comprising an optically transparent substrate, a protective layer, a system of electrodes, a transflecting layer, and at least one anisotropic thin crystal film made of a substance containing aromatic rings and possessing a structure with an interplanar spacing of 3.4±

0.2Å

along one of optical axes,

wherein the at least one thin crystal film is situated between the substrate and the system of electrodes and is separated from the system of electrodes by the protective layer, and the substrate is made of a polymer or glass material transparent in the visible range and cutting off the UV radiation component, so that transmission of the multilayer plate for UV radiation does not exceed 1% at any wavelength below 380 nm wherein the thin crystal film is a polarizer of the E type that simultaneously performs the functions of a polarizer and a phase-shifting layer; and

wherein at least a part of the protective layer is conducting.

30. The display panel according to claim 29, wherein the substance of the thin crystal film contains heterocycles.

31. The display panel according to claim 30, wherein the heterocycles are oriented so that their planes are perpendicular to the substrate plane.

32. The display panel according to claim 29, wherein the substrate is made of a material absorbing UV radiation.

33. The display panel according to claim 29, wherein the substrate is made of a colorless soda-lime glass.

34. The display panel to claim 33, wherein the colorless soda-lime glass contains additives of selenium oxide, iron oxide, cobalt oxide, and selenium.

35. The display panel according to claim 33, wherein the colorless soda-lime glass contains additives of selenium oxide (0.1-10%), iron oxide (about 0.07%), cobalt oxide (0.000001-0.001%), and selenium (up to 0.08%).

36. The display panel according to claim 29, wherein the substrate is made of a plastic.

37. The display panel according to claim 29, further comprising a reflecting layer.

38. The display panel according to claim 37, wherein the reflecting layer is specular or diffusive.

39. The display panel according to claim 38, wherein the reflecting layer is applied on the rear side of the substrate.

40. The display panel according to claim 38, wherein the reflecting layer is applied on the front side of the substrate and there is a planarization layer between the reflecting layer and the thin crystal film.

41. The display panel according to claim 29, further comprising a layer absorbing UV radiation.

42. The display panel according to claim 41, wherein the transmission in the visible spectral range is not less than 80%.

43. The multi plate according to claim 41, wherein the layer absorbing UV radiation comprises 4-alkoxy-2-hydroxyphenyl-s-triazin incorporated in a cellulose triacetate film.

44. The multilayer plate according to claim 41, wherein the layer absorbing UV radiation is applied between any of the function layers.

45. The multilayer plate according to claim 41, wherein the layer absorbing UV radiation is applied outside the multilayer plate.

46. The multilayer plate according to claim 45, wherein the layer absorbing UV radiation is prepared to coat with a lacquer containing necessary additives and absorbing the UV radiation.

47. The display panel according to claim 29, wherein the protective layer is made of silicon dioxide and/or at least one heavy metal oxide or a polymer.

48. The display panel according to claim 29, wherein the electrode system is made of ITO.

49. The display panel according to claim 48, wherein a metal grid is applied onto the ITO layer.

50. The display panel according to claim 49, wherein the total area of the metal grid amounts to less than 10% of the total area of electrodes.

51. The display panel according to claim 29, wherein refractive indices of each layer in at least one spectral region, thicknesses of these layers, and their combination are selected so that the display panel provides an interference extremum for at least one polarization of light in this spectral region.

52. The display panel according to claim 29, further comprising an adhesive layers.

53. The display panel according to claim 29, further comprising an additional polarizer.

54. The display panel according to claim 53, wherein the additional polarizer is placed on the side of the substrate opposite to the thin crystal film.

55. The display panel according to claim 29, further comprising a transflecting layer.

56. The display panel according to claim 55, wherein the transflecting layer is specular or diffusive.

57. The display panel according to claim 55, wherein the transflecting layer is applied on the rear side of the substrate.

58. The display panel according to claim 55, wherein the transflecting layer is applied on the front side of the substrate and there is a planarization layer between the transflecting layer and the thin crystal film.

59. A multilayer plate comprising an optically transparent substrate, a protective layer, a conducting layer, and at least one anisotropic thin crystal film made of a substance containing aromatic rings and possessing a structure with an interplanar spacing of 3.4±

0.2Å

along one of optical axes,

wherein the at least one crystal film is situated between the substrate and the conducting layer and is separated from the conducting layer by the protective layer,

and further comprises a layer absorbing UV radiation,

so that transmission of the multilayer plate for UV radiation dose not exceed 1% at any wavelength below 380 nm wherein the thin crystal film is a polarizer of the E type that simultaneously performs the functions of a polarizer and a phase-shifting layer; and

wherein at least a part of the protective layer is conducting.

60. The multi plate according to claim 59, wherein the layer absorbing UV radiation comprises 4-alkoxy-2-hydroxyphenyl-s-triazin incorporated in a cellulose triacetate film.

61. The multilayer plate according to claim 59, wherein the layer absorbing UV radiation is applied either between any of the function layers.

62. The multilayer plate according to claim 59, wherein the layer absorbing UV radiation is applied outside the multilayer plate.

63. The multilayer plate according to claim 59, wherein the layer absorbing UV radiation is prepared to coat with a lacquer containing necessary additives and absorbing the UV radiation.

64. The multilayer plate according to claim 59, wherein the substance of the crystal film contains heterocycles.

65. The multilayer plate according to claim 64, wherein the heterocycles are oriented so that their planes are perpendicular to the substrate plane.

66. The multilayer plate according to claim 59, wherein the substrate is made of a material absorbing UV radiation.

67. The multilayer plate according to claim 59, wherein the substrate is made of a glass.

68. The multilayer plate according to claim 59, wherein the substrate is made of a colorless soda-lime glass.

69. The multilayer plate according to claim 68, wherein the colorless soda-lime glass contains additives of selenium oxide, iron oxide, cobalt oxide, and selenium.

70. The multilayer plate according to claim 68, wherein the colorless soda-lime glass contains additives of selenium oxide (0.1-10%), iron oxide (about 0.07%), cobalt oxide (0.000001-0.001%), and selenium (up to 0.08%).

71. The multilayer plate according to claim 59, wherein the substrate is made of a plastic.

72. The multilayer plate according to claim 59, further comprising transflecting layer.

73. The multilayer plate according to claim 72, wherein the transflecting layer is specular or diffusive.

74. The multilayer plate according to claim 72, wherein the transflecting layer is applied on the rear side of the substrate.

75. The multilayer plate according to claim 72, wherein the transflecting layer is applied on the front side of the substrate and there is a planarization layer between the transflecting layer and the thin crystal film.

76. The multilayer plate according to claim 59, wherein the protective layer is made of silicon dioxide and/or at least one heavy metal oxide or a polymer.

77. The multilayer plate according to claim 59, wherein the transmission in the visible spectral range is not less than 80%.

78. The multilayer plate according to claim 59, wherein the conducting layer is made of ITO.

79. The multilayer plate according to claim 78, wherein a metal grid is applied onto the conducting layer.

80. The multilayer plate according to claim 79, wherein the total area of the metal grid amounts to less than 10% of the total area of the multilayer plate.

81. The multilayer plate according to claim 59, wherein refractive indices of each layer in at least one spectral region, thicknesses of these layers, and their combination are selected so that the multilayer plate provides an interference extremum for at least one polarization of light in this spectral region.

82. The multilayer plate according to claim 59, further comprising at least one polymer coating.

83. A display panel comprising an optically transparent substrate, a protective layer, a system of electrodes, and at least one anisotropic thin crystal film made of a substance containing aromatic rings and possessing a structure with an interplanar spacing of 3.4±

0.2Å

along one of optical axes,

wherein the at least one thin crystal film is situated between the substrate and the system of electrodes and is separated from the system of electrodes by the protective layer,

and further comprises a layer absorbing UV radiation,

so that transmission of the multilayer plate for UV radiation does not exceed 1% at any wavelength below 380 nm wherein the thin crystal film is a polarizer of the E type that simultaneously performs the functions of a polarizer and a phase-shifting layer; and

wherein at least a part of the protective layer is conducting.

84. The display panel according to claim 83, wherein the substance of the thin crystal film contains heterocycles.

85. The display panel according to claim 84, wherein the heterocycles are oriented so that their planes are perpendicular to the substrate plane.

86. The display panel according to claim 83, wherein the substrate is made of a material absorbing UV radiation.

87. The display panel according to claim 83, wherein the substrate is made of a glass.

88. The display panel according to claim 83, wherein the substrate is made of a colorless soda-lime glass.

89. The display panel according to claim 88, wherein the colorless soda-lime glass contains additives of selenium oxide, iron oxide, cobalt oxide, and selenium.

90. The display panel according to claim 88, wherein the colorless soda-lime glass contains additives of selenium oxide (0.1-10%), iron oxide (about 0.07%), cobalt oxide (0.000001-0.001%), and selenium (up to 0.08%).

91. The display panel according to claim 83, wherein the substrate is made of a plastic.

92. The display panel according to claim 83, further comprising a transflecting layer.

93. The display panel according to claim 92, wherein the transflecting layer is specular or diffusive.

94. The display panel according to claim 92, wherein the transflecting layer is applied on the rear side of the substrate.

95. The display panel according to claim 92, wherein the transflecting layer is applied on the front side of the substrate and there is a planarization layer between the transflecting layer and the thin crystal film.

96. The display panel according to claim 95, wherein the transmission in the visible spectral range is not less than 80%.

97. The display panel according to claim 83, wherein the protective layer is made of silicon dioxide and/or at least one heavy metal oxide or a polymer.

98. The display panel according to claim 83, wherein the electrode system is made of ITO.

99. The display panel according to claim 98, wherein a metal grid is applied onto the ITO layer.

100. The display panel according to claim 99, wherein the total area of the metal grid amounts to less than 10% of the total area of electrodes.

101. The display panel according to claim 83, wherein refractive indices of each layer in at least one spectral region, thicknesses of these layers, and their combination are selected so that the display panel provides an interference extremum for at least one polarization of light in this spectral region.

102. The display panel according to claim 83, further comprising an adhesive layers.

103. The display panel according to claim 83, further comprising an additional polarizer.

104. The display panel according to claim 103, wherein the additional polarizer is placed on the side of the substrate opposite to the thin crystal film.