Display panel and multilayer plates for production of this display panel

• US 20040036817A1
• Filed: 04/04/2003
• Published: 02/26/2004
• Est. Priority Date: 08/22/2002
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Insolvency Services Group, Inc.
• Inventors: Paukshto, Michael V., Lazarev, Pavel I.
• Granted Patent: US 7,317,499 B2
• Time in Patent Office: Days
• US Class Current: 349/56
• 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±

0.2 Å

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, so that transmission of the multilayer plate for UV radiation does not exceed 1% at any wavelength below 380 nm.

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 glass.

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

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

8. The multilayer plate according to claim 7, wherein the reflecting layer is specular or diffusive.

9. The multilayer plate according to claim 8, wherein the reflecting layer is applied on the rare side of the substrate.

10. The multilayer plate according to claim 8, 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.

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

12. The multilayer plate according to claim 11, wherein the transflecting layer is specular or diffusive.

13. The multilayer plate according to claim 12, wherein the transflecting layer is applied on the rare side of the substrate.

14. The multilayer plate according to claim 12, 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.

15. 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.

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

17. The multilayer plate according to claim 16, wherein the transmission in the visible spectral range is not less than 80%.

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

19. The multilayer plate according to claim 18, wherein a metal grid is applied onto the conducting layer.

20. The multilayer plate according to claim 19, wherein the total area of the metal grid amounts to less than 10% of the total area of the multilayer plate.

21. The multilayer plate according to claim 1, wherein the thin crystal film is a polarizer of the E type.

22. The multilayer plate according to claim 21, wherein the thin crystal film simultaneously performs the functions of a polarizer and a phase-shifting layer.

23. The multilayer plate according to claim 1, wherein at least a part of the protective layer is conducting.

24. 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.

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

26. 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±

0.2 Å

along one of optical axes,

wherein the at least one thin crystal film is situated between the substrate and the conducting layer and is separated from the conducting layer by the protective layer, so that transmission of the multilayer plate for UV radiation does not exceed 1% at any wavelength below 380 nm.

27. The display panel according to claim 26, wherein the substance of the thin crystal film contains heterocycles.

28. The display panel according to claim 27, wherein the heterocycles are oriented so that their planes are perpendicular to the substrate plane.

29. The display panel according to claim 26, wherein the substrate is made of a material absorbing UV radiation.

30. The display panel according to claim 26, wherein the substrate is made of a glass.

31. The display panel according to claim 26, wherein the substrate is made of a plastic.

32. The display panel according to claim 26, further comprsing a reflecting layer.

33. The display panel according to claim 32, wherein the reflecting layer is specular or diffusive.

34. The display panel according to claim 33, wherein the reflecting layer is applied on the rare side of the substrate.

35. The display panel according to claim 33, 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.

36. The display panel according to claim 26, further comprisng a transflecting layer.

37. The display panel according to claim 36, wherein the transflecting layer is specular or diffusive.

38. The display panel according to claim 37, wherein the transflecting layer is applied on the rare side of the substrate.

39. The display panel according to claim 37, 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.

40. The display panel according to claim 26, further comprsing a layer absorbing UV radiation.

41. The display panel according to claim 40, wherein the transmission in the visible spectral range is not less than 80%.

42. The display panel according to claim 26, wherein the protective layer is made of silicon dioxide and/or at least one heavy metal oxide or a polymer.

43. The display panel according to claim 26, wherein the electrode system is made of ITO.

44. The display panel according to claim 43, wherein a metal grid is applied onto the ITO layer.

45. The display panel according to claim 44, wherein the total area of the metal grid amounts to less than 10% of the total area of electrodes.

46. The display panel according to claim 26, wherein the thin crystal film is a polarizer of the E type.

47. The display panel according to claim 46, wherein the thin crystal film simultaneously performs the functions of a polarizer and a phase-shifting layer.

48. The display panel according to claim 26, 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.

49. The display panel according to claim 26, further comprising an adhesive layers.

50. The display panel according to claim 26, further comprising an additional polarizer.

51. The display panel according to claim 50, wherein the additional polarizer is placed on the side of the substrate opposite to the thin crystal film.