Optical filter, display unit and touch panel unit

• US 20060045989A1
• Filed: 06/12/2003
• Published: 03/02/2006
• Est. Priority Date: 06/28/2002
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Minami, Kazuhiko
• Application Number:
  US10/518,231
• Publication Number:
  US 20060045989A1
• Time in Patent Office: Days
• US Class Current: 428/1.100
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2250/42 Alternating layers, e.g. ABAB(C), AABBAABB(C)
• CPC Class Codes: B32B 2264/105 Metal
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/4026 within the layer by addition of a colorant, e.g. pigments, dyes
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 2307/748 Releasability
• CPC Class Codes: B32B 2405/00 Adhesive articles, e.g. adhesive tapes
• CPC Class Codes: B32B 2457/208 Touch screens
• CPC Class Codes: B32B 2551/00 Optical elements
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/20 using fillers, pigments, thixotroping agents
• 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: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Abstract

To provide an optical filter, which has good repeeling properties and does not generate thermally decomposed products from an adhesive layer adhered to a part decomposed products which hardly remain, even when the optical film is In an optical filter comprising an optical film and containing an adhesive for adhering said optical film to an said optical film or inside said optical film, the adhesive comprises a olefin polymer so that it has a repeeling property from the adherent surface.

Claims

1. An optical filter comprising an optical film and containing an adhesive for adhering said optical film to an adherent surface on the surface of said optical film or inside said optical film, wherein said adhesive comprises a olefin polymer and has a repeeling property from the adherent surface.

2. The optical filter according to claim 1, wherein an adhesive layer formed from said adhesive has a peeling strength of 0.2 to 5 N/25 mm when measured against a surface of a polyethylene terephthalate (PET) at a peeling rate of 90 inch/min. (about 229 cm/min.) at a peeling angle of 180 degrees.

3. The optical filter according to claim 1, wherein said optical film comprises a louver film.

4. A display unit comprising:

(A) a display module having a light-exiting surface,

(B) a light-transmitting touch panel module which is provided to cover the light-exiting surface of said display module and has a back surface facing the light-exiting surface of said display module and a front surface which a user can touch,

(C) an optical filter according to claim 1, 2 or 3 provided between the light-exiting surface of said display module and the back surface of said touch panel module,

wherein said optical filter is adhered to at least one of the back surface of said touch panel module and the light-exiting surface of said display module with said adhesive.

5. A touch panel unit comprising:

(i) a light-transmitting touch panel module having a back surface which faces the light-exiting surface when said touch panel module is provided to cover the light-exiting surface of said display module, and a front surface which a user can touch, and

(ii) an optical filter according to claim 1, 2 or 3, which is fixed to the back surface of said touch panel module,

wherein said optical filter is adhered to the back surface of said touch panel module with said adhesive.