Anti-reflection structure for mobile phone display and window

• US 20040184147A1
• Filed: 03/20/2003
• Published: 09/23/2004
• Est. Priority Date: 03/20/2003
• Status: Active Grant

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Parikka, Marko, Saarinen, Kaj
• Granted Patent: US 6,888,676 B2
• Time in Patent Office: Days
• US Class Current: 359/491
• CPC Class Codes: B29C 2059/023 Microembossing
• CPC Class Codes: B29C 59/02 by mechanical means, e.g. pressing B29C59/007 takes precedence; embossing expanded porous articles B29C44/5627
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 1/118 having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
• CPC Class Codes: Y10S 359/90 Methods

Abstract

A method of producing an antireflection structure for use on a display or a window surface or both in an electronic device, such as a mobile phone. The display can be an LCD with a top polarizer and a bottom polarizer. The antireflection structure is imparted on the top polarizer by a roller embossing process. In particular, the embossing is carried out in the same manufacturing process when the polarizer is produced. The antireflection structure has a plurality of sub-wavelength periodic grooves. The antireflection structure on the window surface can be imparted using an embossing process or an injection molding process.

Claims

1. A method of realizing a light reflection reduction structure on at least one surface of a display, wherein the display has at least one optical polarizing component disposed thereon and the reflection reduction structure comprises a plurality of sub-wavelength periodic grooves, and wherein the polarizing component comprises an impressible film and a directional optical filter sheet, said method characterized by

attaching the impressible film to the directional optical filter sheet for forming a laminated sheet, and by

imparting the periodic grooves on the impressible film.

2. The method of claim 1, characterized in that the attaching of the impressible film to the filter sheet is carried out prior to the imparting of the periodic grooves.

3. The method of claim 1, characterized in that the imparting of the periodic grooves is carried out prior to the attaching of the impressible film to the filter sheet.

4. The method of claim 1, characterized in that the directional optical filter sheet has a first side and an opposing second side, wherein the impressible film is attached to the first side of the filter sheet, said method further characterized by

attaching a further film to the filter sheet on the second side thereof.

5. The method of claim 1, characterized in that the directional optical filter sheet comprises a stretched film, said method further characterized by

applying iodine molecules onto the stretched film for affecting optical polarization.

6. The method of claim 1, characterized in that the display comprises a liquid-crystal display.

7. The method of claim 6, characterized in that the display has a first side facing a user and an opposing second side, wherein the optical polarizing component is disposed on the first side.

8. The method of claim 7, characterized in that the display further has a further optical polarizing component disposed on the second side of the display.

9. The method of claim 1, characterized in that the imparting step is carried out using an embossing process.

10. The method of claim 9, characterized in that the imparting of the periodic grooves on the impressible film is carried out using a roller having a surface with a pattern for imparting the periodic grooves.

12. The optical component of claim 11, wherein the optical device comprises a display.

13. The optical component of claim 12, wherein the optical device comprises a liquid-crystal display.

11. An optical component for use in an optical device, characterized by:

a directional optical filter sheet, and by

an impressible film, wherein the impressible film has a first side and an opposing second side attached to the directional optical filter sheet, and the first side of the impressive film includes a sub-wavelength period structure embossed thereon for reducing light reflection from the first side of the impressive film.

14. A mobile terminal comprising:

means for communicating with a network component in a communications network,

a display for displaying information,

a surface having a microstructure positioned relative to the display for reducing light reflection, and

at least one optical polarizing component disposed between the surface and the display, wherein the microstructure comprises a plurality of sub-wavelength grooves.

15. The mobile terminal of claim 14, wherein the surface is spaced from the optical polarizing component.

16. The mobile terminal of claim 14, wherein the surface is attached to the optical polarizing component.

17. The mobile terminal of claim 16, wherein optical polarizing component comprises a direction optical filter sheet and the surface comprises an impressible film imparted with the sub-wavelength grooves.

18. The mobile terminal of claim 14, wherein the sub-wavelength grooves are imparted on the surface by a roller embossing process.

19. The mobile terminal of claim 15, wherein the sub-wavelength grooves are imparted on the surface by an injection molding process.