Antireflection films for use with displays

• US 6,800,378 B2
• Filed: 10/14/2002
• Issued: 10/05/2004
• Est. Priority Date: 02/19/1998
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Pawlak, Richard G., Lund, Tiffany E., Hawa, A. Nader, Trapani, Georgio, Nagarkar, Pradnya V.
• Primary Examiner(s): DIXON, MERRICK L
• Application Number:
  US10/270,034
• Publication Number:
  US 20030116270A1
• Time in Patent Office: 722 Days
• Field of Search: 428/688, 428/323, 428/206, 428/402, 428/636
• US Class Current: 428/688
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: Y10T 428/24893 including particulate material
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]

Abstract

An antireflection film and method of making same includes a substrate having a first surface and a second surface, the substrate being a circular polarizer, a linear polarizer, or a louvered plastic film, an inorganic layer deposited on the first surface of the substrate, and an optically active polymer layer formed by curing a curable composition in situ on the inorganic layer, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 nm to 700 nm and a thickness of from about 20 nm to about 200 nm.

Claims

1. An antireflection film comprising:

a substrate having a first surface and a second surface, wherein the substrate is a circular polarizer, a linear polarizer, or a louvered plastic film;

an inorganic layer deposited on the first surface of the substrate; and

an optically active polymer layer formed by curing a curable composition in situ on the inorganic layer, the polymer layer having a refractive index not greater than about 1.53 over the wavelength range of 400 nm to 700 nm and a thickness of from about 20 nm to about 200 nm.

2. The antireflection film of claim 1 wherein the inorganic layer comprises a metal oxide, a nitride, nickel, chromium, silica, or any combination thereof.

3. The antireflection film of claim 2 wherein the metal oxide is indium oxide, titanium dioxide, nickel oxide, chromium oxide, cadmium oxide, gallium indium oxide, niobium pentoxide, indium tin oxide, tin dioxide, or any combination thereof.

4. The antireflection film of claim 3 wherein the metal oxide layer has a thickness of from about 10 to about 30 nm and the polymer layer has a thickness of from about 80 nm to about 150 nm.

5. The antireflection film of claim 2 wherein the nitride is silicon nitride, titanium nitride, or a combination thereof.

6. The antireflection film of claim 2 wherein the inorganic layer comprises a first metal oxide layer, a silica layer, and a second metal oxide layer, wherein the silica layer is disposed between the first metal oxide layer and the second metal oxide layer and wherein the first metal oxide layer is deposited on the first surface of the substrate.

7. The antireflection film of claim 6 wherein the first metal oxide layer has a thickness of from about 20 nm to about 35 nm, the silica layer has a thickness of from about 10 nm to about 25 inn, the second metal oxide layer has a thickness of from about 50 nm to about 100 nm and the polymer layer has a thickness of from about 70 nm to about 120 nm.

8. The antireflection film of claim 2 wherein the inorganic layer comprises a metal oxide layer and a silica layer, the metal oxide layer being deposited on the first surface of the substrate and the silica layer being deposited on the metal oxide layer.

9. The antireflection film of claim 8 wherein the metal oxide layer has a thickness of from about 10 nm to about 30 nm, the silica layer has a thickness of from about 10 nm to about 120 nm, and the polymer layer has a thickness of from about 50 nm to about 130 nm.

10. The antireflection film of claim 1 wherein the polymer layer comprises repeating units derived from a fluoroalkene, an acrylate with silicone, a methacrylate, a polyfunctional acrylate monomer, or any combination thereof.

11. The antireflection film of claim 1 wherein the polymer layer comprises repeating units derived from a fluoroalkene and repeating units derived from an acrylate with silicone and wherein the polymer layer has an outer portion enriched in the acrylate with silicone and an inner portion enriched in the fluoroalkene.

12. The antireflection film of claim 1 wherein the polymer layer comprises repeating units derived from a fluoroalkene and repeating units derived from a methacrylate and wherein the polymer layer has an outer portion enriched in the methacrylate and an inner portion enriched in the fluoroalkene.

13. The antireflection film of claim 1 wherein the polymer layer further comprises an antistatic agent.

14. The antireflection film of claim 1 further comprising an antistatic coating disposed on the polymer layer.

15. The antireflection film of claim 1 further comprising a hardcoat layer disposed between the first surface of the substrate and the inorganic layer.

16. The antireflection film of claim 15 wherein the hardcoat layer has a thickness of from about 1 μ

m to about 15 μ

m.

17. The antireflection film of claim 15 wherein the hardcoat layer comprises colloidal inorganic oxide particles dispersed in a free-radically cured binder.

18. The antireflection film of claim 1 further comprising a support layer disposed adjacent to the substrate.

19. The antireflection film of claim 1 further comprising a louvered plastic layer disposed between the first surface of the substrate and the inorganic layer.

20. The antireflection film of claim 1 wherein the substrate is a circular polarizer comprising a linear polarizer and a quarter-wavelength retarder, the inorganic layer being adjacent to the linear polarizer.

21. The antireflection film of claim 1 further comprising an adhesive layer.

22. The antireflection film of claim 21 wherein the adhesive layer is microtextured.

23. The antireflection film of claim 1 further comprising an infrared blocking component.

24. The antireflection film of claim 1 further comprises a protective layer disposed adjacent to the substrate.