Display apparatus and antireflection substance

• US 20040076835A1
• Filed: 11/26/2003
• Published: 04/22/2004
• Est. Priority Date: 11/06/2001
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Watanabe, Kazuo
• Granted Patent: US 7,405,005 B2
• Time in Patent Office: Days
• US Class Current: 428/432
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 1/115 Multilayers

Abstract

The present invention provides an antireflection substance such as an antireflection film having a low moisture-permeable characteristic, high quality and high reliability, and also provides a display apparatus comprising this antireflection substance. The antireflection substance according to the present invention includes an antireflection film formed on a transparent substrate, the antireflection film being composed of a multiple layer in which a first layer serving as an adhesion-improving layer, a second layer serving as a barrier layer against moisture, a third layer, a fourth layer and a fifth layer are laminated in this order, and in which the second layer and the fourth layer are each set to have a refractive index higher than that of the third layer and the fifth layer. The display apparatus according to the present invention comprises this antireflection substance on its display surface.

Claims

1. An antireflection substance characterized by comprising an antireflection film formed on a transparent substrate, the antireflection film being composed of a multiple layer in which a first layer serving as an adhesion-improving layer, a second layer serving as a barrier layer against moisture, a third layer, a fourth layer and a fifth layer are laminated in this order, and in which said second layer and said fourth layer are each set to have a refractive index higher than that of said third layer and said fifth layer.

2. An antireflection substance according to claim 1, wherein said second layer is formed of a film that has a refractive index of 1.7 to 2.4 in a visible-light region and has a physical thickness of 10 nm to 50 nm.

3. An antireflection substance according to claim 1, wherein said second layer is formed of a film having an attenuation coefficient of 0.1 or less in the range of wavelengths 450 nm to 650 nm.

4. An antireflection substance according to claim 1, wherein said second layer is formed of silicon nitride or silicon oxidic nitride produced by a reactive physical vapor deposition process.

5. An antireflection substance according to claim 1, wherein said second layer has a moisture permeability of 0.6 g/m²/day or less.

6. An antireflection substance according to claim 1, wherein the substance including said transparent substrate and said antireflection film has reflectance of 4.0% or less in the range of wavelengths 450 nm to 650 nm, light transmissivity of 90.0% or more at the central wavelength 550 nm, and also light transmissivity of 90.0% or more at the respective wavelengths 450 nm and 650 nm.

7. An antireflection substance according to claim 1, wherein said antireflection film has a surface resistance of 10⁹ Ω

/□

or more.

8. An antireflection substance according to claim 1, wherein said fourth layer is formed of metal oxide or metal nitride having a refractive index of 1.9 to 2.4 in a visible-light region and a physical thickness of 18 nm to 50 nm.

9. An antireflection substance according to claim 1, wherein said fourth layer is an optical film different from said second layer, and is formed of one kind of material selected among titanium oxide, niobium oxide, tantalum oxide, niobium nitride, and zirconium oxide.

10. An antireflection substance according to claim 1, wherein the substance including said transparent substrate and said antireflection film has a moisture permeability less than 1 g/m²/day.

11. An antireflection substance according to claim 1, wherein said first layer serving as the adhesion-improving layer is formed of metal oxide, metal nitride or metal oxidic nitride having a physical thickness of 3 nm to 10 nm and light transmissivity of 86% to 92% in a visible-light region.

12. A display apparatus characterized by comprising an antireflection substance on the display surface, including an antireflection film composed of a multiple layer formed on a transparent substrate, in which a first layer serving as an adhesion-improving layer, a second layer serving as a barrier layer against moisture, a third layer, a fourth layer and a fifth layer are laminated in this order, and said second layer and said fourth layer are each set to have a refractive index higher than that of said third layer and said fifth layer.

13. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which said second layer is formed of a film having a refractive index of 1.7 to 2.4 in a visible-light region and a physical thickness of 10 nm to 50 nm is formed.

14. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which said second layer is formed of a film having an attenuation coefficient of 0.1 or less in the range of wavelengths 450 nm to 650 nm.

15. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which said second layer is composed of silicon nitride or silicon oxidic nitride formed by a reactive physical vapor deposition process.

16. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which said second layer has moisture permeability of 0.6 g/m²/day or less.

17. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which the substance including said transparent substrate and said antireflection film has reflectance of 4.0% or less in the range of wavelengths 450 nm to 650 nm, light transmissivity of 90.0% or more at the central wavelength 550 nm, and also light transmissivity of 90.0% or more at the respective wavelengths 450 nm and 650 nm.

18. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which said antireflection film has a surface resistance of 10⁹ Ω

/□

or more.

19. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which said fourth layer is composed of metal oxide or metal nitride having a refractive index of 1.9 to 2.4 in a visible-light region and a physical thickness of 18 nm to 50 nm.

20. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which sand fourth layer is an optical film different from said second layer and is formed of one kind of material selected among titanium oxide, niobium oxide, tantalum oxide, niobium nitride and zirconium oxide.

21. A display apparatus according to claim 12, wherein on he display surface the display apparatus includes said antireflection substance in which the substance including said transparent substrate and said antireflection film has moisture permeability less than 1 g/m²/day.

22. A display apparatus according to claim 12, wherein on the display surface the display apparatus includes said antireflection substance in which said first layer serving as the adhesion-improving layer is composed of metal oxide, metal nitride or metal oxidic nitride having a physical thickness of 3 nm to 10 nm and light transmissivity of 86% to 92% in a visible-light region.