Attachment film for electronic display device

• US 6,760,086 B2
• Filed: 03/22/1999
• Issued: 07/06/2004
• Est. Priority Date: 03/26/1998
• Status: Expired due to Term

• Current Assignee: Tomoegawa Paper Company Limited (Tomoegawa Co., Ltd.)
• Original Assignee: Tomoegawa Paper Company Limited (Tomoegawa Co., Ltd.)
• Inventors: Yanagisawa, Masami, Hattori, Takuma, Haji, Keiichiro
• Primary Examiner(s): NGUYEN, DUNG T
• Application Number:
  US09/273,261
• Publication Number:
  US 20030089516A1
• Time in Patent Office: 1,933 Days
• Field of Search: 349/122, 349/116, 349/64, 349/110, 430/5, 430/7, 430/14, 428/329, 428/141, 428/428, 166/318.6, 359/599, 362/31
• US Class Current: 349/122
• CPC Class Codes: C09J 11/04 inorganic
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G02F 1/133509 Filters, e.g. light shielding masks
• CPC Class Codes: H01J 2211/44 Optical arrangements or shielding arrangements, e.g. filters or lenses
• CPC Class Codes: H01J 2229/8913 Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices

Abstract

An attachment film for an electronic display, which film is used for adjusting the optical transmissivity in a variety of electronic displays and adjusting color shades. It permits the simple and easy adjustment of the reflection of a fluorescent lamp and sunlight in and from the screen thereof and can prevent the formation of air bubbles in an adhesive layer thereof. The attachment film includes a transparent substrate and an adhesive layer which contains carbon black dispersed therein and formed on one surface of a transparent substrate.

Claims

1. An attachment film for an electronic display, which is for adjusting the quantity of transmitted light from a light source and adjusting the black and white contrast, which comprises an adhesive layer which is re-separable and contains carbon black having a pH of 4 or less dispersed therein and contains an acrylic adhesive having a carboxyl group and/or a hydroxyl group and is formed on one surface of a transparent substrate.

2. An attachment film according to claim 1, wherein an anti-reflection layer is formed on one surface or each surface of the transparent substrate.

3. An attachment film according to claim 1, wherein the adhesive layer further contains a coloring pigment different from the carbon black.

4. An attachment film according to claim 3, wherein the coloring pigment is at least one pigment selected from the group consisting of a red pigment and a blue pigment.

5. An attachment film according to claim 1, wherein the attachment film is colored in neutral gray.

6. An attachment film according to claim 5, which has an a-value and b-value which are within ±

5 each when measured with a color-difference meter.

7. An attachment film according to claim 1, wherein the carbon black in the adhesive layer has an average particle diameter of 30 nm or less and has a BET specific surface area of at least 100 m²/g.

8. An attachment film according to claim 1, wherein the adhesive layer further contains a photopolymerizable compound and a photopolymerization initiator.

9. The attachment film according to claim 1, wherein the adhesive layer contains a (meth) acrylate resin as an adhesive and a (meth) acrylate monomer or oligomer as the photopolymerizable compound.

10. The attachment film according to claim 1, wherein the adhesive layer is formed on one surface of the transparent substrate and a hard coating layer and an anti-reflection layer are consecutively formed on the other surface of the transparent substrate.