Material comprising an anti-reflective coating on a flexible glass substrate

• US 6,366,013 B1
• Filed: 03/15/1999
• Issued: 04/02/2002
• Est. Priority Date: 03/17/1998
• Status: Expired due to Term

• Current Assignee: InnoLux Corporation
• Original Assignee: Agfa-Gevaert N.V.
• Inventors: Lievens, Hugo, Leenders, Luc, Lippens, Paul, Verlinden, Bartholomeus, Tahon, Jean-Pierre
• Primary Examiner(s): Patel, Nimeshkumar D.
• Assistant Examiner(s): Guharay, Karabi
• Application Number:
  US09/267,676
• Time in Patent Office: 1,114 Days
• Field of Search: 313/479, 313/480, 313/473, 313/474, 313/478, 359/609, 359/586, 359/588, 359/585, 359/584, 359/580, 348/821, 348/823, 348/824, 348/825, 348/832
• US Class Current: 313/479
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/10165 Functional features of the laminated safety glass or glazing
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/1033 Laminated safety glass or glazing containing temporary protective coatings or layers
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: G02B 1/116 including electrically conducting layers
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G03C 1/76 Photosensitive materials characterised by the base or auxiliary layers
• CPC Class Codes: G03C 1/7614 Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion characterised by the inert particulate additive G03C1/95
• CPC Class Codes: G03C 1/795 the base being of macromolecular substances G03C1/775 takes precedence
• CPC Class Codes: G03C 1/7954 Polyesters
• CPC Class Codes: G03C 1/853 Inorganic compounds, e.g. metals
• CPC Class Codes: G03C 1/91 characterised by subbing layers or subbing means
• CPC Class Codes: G03C 8/06 Silver salt diffusion transfer
• CPC Class Codes: H01L 23/585 comprising conductive layers or plates or strips or rods or rings H01L23/60, H01L23/62, H01L23/64, H01L23/66 take precedence
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A material is disclosed which is suitable for reducing the reflection of information displays such as a CRT, LCD, plasma tube, etc., and is characterised by an improved pencil hardness and excellent optical properties (lower average reflection, higher bandwidth). The anti-reflection material of the invention comprises an anti-reflective coating 20 and an optional top coat 10 on a flexible glass substrate 30 that is capable of being wound around a cylindrical core having a radius of 1.5 m. In a preferred method of the present invention the glass substrate 30 is provided with anti-reflective coating 20 using a continuous web coating process while being laminated to a polymer support 50 by using adhesive layer 40. Upon delamination (arrows 60) the adhesive layer 40 may remain fixed to glass substrate 30 (right embodiment of FIG. 1) or to polymer support 50 (left embodiment of FIG. 1). After said delamination the glass substrate 30 provided with anti-reflective coating 20 may be adhered to the front panel of an information display device.

Claims

1. A web- or sheet-like material comprising an anti-reflective coating and a glass substrate that is capable of being wound around a cylindrical core having a radius of 1.5 m, wherein said material further comprises a support which is laminated to the glass substrate at a side opposite to the anti-reflective coating and wherein the support consists essentially of an organic polymer support.

2. Material according to claim 1 wherein said glass substrate has a thickness lower than 0.5 mm.

3. Material according to claim 1 wherein the anti-reflective coating is a stack comprising four material layers, respectively designated as the first, second, third and fourth layer, starting from the layer located farthest from the glass substrate, and wherein said first and third layer consist essentially of silicon dioxide, and said second and fourth layer consist essentially of titanium dioxide.

4. Material according to claim 1 wherein the anti-reflective coating is a stack comprising four material layers, respectively designated as the first, second, third and fourth layer, starting from the layer located farthest from the glass substrate, and wherein said first layer has an optical thickness of about a quarterwave (λ

_O/4), and wherein said second layer has an optical thickness of about a halfwave (λ

_O/2), and wherein said third layer has an optical thickness of about λ

_O/8, and wherein said fourth layer has an optical thickness of about λ

_O/16, λ

_O being about 510 nm.

5. Material according to claim 3 or 4 further comprising an additional layer between said second and third layer, said additional layer consisting essentially of indium-tin oxide.

6. Material according to claim 1 further comprising a top coat (10) applied on the anti-reflective coating.

7. Material according to claim 1 further comprising an adhesive layer between the glass substrate and the support.

8. Material according to claim 7 wherein the adhesive layer is capable of remaining fixed to the glass substrate upon delamination.

9. Material according to claim 7 wherein the adhesive layer is capable of remaining fixed to the support upon delamination.

10. An information display device comprising a display element, said display element having a front panel with an outer surface, wherein a material according to claim 1 is applied on said outer surface.

11. Device according to claim 10 wherein the display element is a cathode ray tube and the outer surface is a curved surface.

12. Device according to claim 10 wherein the display element is a flat panel display and the outer surface is a flat surface.