Display apparatus and antireflection substance

• US 7,405,005 B2
• Filed: 11/06/2002
• Issued: 07/29/2008
• Est. Priority Date: 11/06/2001
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Watanabe, Kazuo
• Primary Examiner(s): Speer; Timothy M.
• Assistant Examiner(s): BALDWIN, GORDON
• Application Number:
  US10/250,579
• Publication Number:
  US 20040076835A1
• Time in Patent Office: 2,092 Days
• Field of Search: 428/411, 428/426, 428/428, 428/432, 428/688, 428/698, 428/332, 428/334, 428/446, 428/448, 428/697, 428/701, 428/702, 428/704, 359/507, 359/577, 359/580, 359/581, 359/582, 359/586, 359/588
• 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 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;

said first layer is composed of SiO_x (x=0.2˜

2.0) and formed of a film having a thickness of 10 nm or less;

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;

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; and

wherein said second layer is composed of silicon nitride, said second layer has moisture permeability of 0.6 g/m²/day or less, and said second layer is composed of a different material from the fourth layer.

2. An antireflection substance according to claim 1, wherein said second layer is formed of a film having an attenuation coefficient of 0.01 or less in the range of wavelengths 450 nm to 650 nm.

3. An antireflection substance according to claim 1, wherein said second layer is produced by a reactive physical vapor deposition process.

4. 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 central wavelength 550 nm, and also light transmissivity of 90.0% or more at the respective wavelengths 450 nm and 650 nm.

5. An antireflection substance according to claim 1, wherein said antireflection film has a surface resistance of 10^9Ω

/□

or more.

6. An antireflection substance according to claim 1, wherein 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 mm.

7. An antireflection substance according to claim 1, wherein said fourth layer is composed of one kind of material selected among titanium oxide, niobium oxide, tantalum oxide, niobium nitride and zirconium oxide.

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

9. An antireflection substance according to claim 1, wherein said second layer is formed of a film having a physical thickness of 10 nm to 40 nm.

10. An antireflection substance according to claim 1, wherein said second layer is formed of a film having a physical thickness of 10 nm to 20 nm.

11. An antireflection substance according to claim 1, wherein said second layer is formed of a film having a refractive index of 1.7 to 1.9 in a visible-light region and a physical thickness of 10 nm to 40 nm.

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, said first layer is composed of SiO_x (x=0.2˜

2.0) and formed of a film having a thickness of 10 nm or less, 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, and wherein said second layer is composed of silicon nitride, said second layer has moisture permeability of 0.6 g/m²/day or less, and said second layer is composed of a different material from the fourth 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.

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 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 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.

17. 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 10^9Ω

/□

or more.

18. 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 n.

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 one kind of material selected among titanium oxide, niobium oxide, tantalum oxide, niobium nitride, and zirconium oxide.

20. 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 moisture permeability less than 1 g/m²/day.

21. A display apparatus according to claim 12, wherein said second layer is formed of a film having a physical thickness of 10 nm to 40 nm.

22. A display apparatus according to claim 12, wherein said second layer is formed of a film having a physical thickness of 10 nm to 20 nm.

23. A display apparatus according to claim 12, wherein said second layer is formed of a film having a refractive index of 1.7 to 1.9 in a visible-light region and a physical thickness of 10 nm to 40 nm.