Optical film, optical filter and display device including the same

• US 20070275184A1
• Filed: 04/26/2007
• Published: 11/29/2007
• Est. Priority Date: 05/23/2006
• Status: Active Grant

• Current Assignee: Cheil Industries Incorporated (Samsung Group)
• Original Assignee: Cheil Industries Incorporated (Samsung Group)
• Inventors: Lee, Byoung Hoo, Kang, Kyoung Ku
• Granted Patent: US 7,655,306 B2
• Time in Patent Office: Days
• US Class Current: 428/1.300
• CPC Class Codes: C09B 1/201 Dyes with no other substituents than the amino groups
• CPC Class Codes: C09B 1/22 Dyes with unsubstituted amino groups
• CPC Class Codes: C09B 23/04 one >CH- group, e.g. cyanines, isocyanines, pseudocyanines
• CPC Class Codes: C09B 5/62 Cyclic imides or amidines of peri-dicarboxylic acids of the anthracene, benzanthrene, or perylene series
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• CPC Class Codes: H01J 11/12 with main electrodes provided on both sides of the discharge space
• CPC Class Codes: H01J 11/44 Optical arrangements or shielding arrangements, e.g. filters, black matrices, light reflecting means or electromagnetic shielding means
• CPC Class Codes: H01J 2211/444 Means for improving contrast or colour purity, e.g. black matrix or light shielding means
• CPC Class Codes: H01J 2329/895 Spectral filters
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31573 Next to addition polymer of ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/3158 Halide monomer type [polyvinyl chloride, etc.]
• CPC Class Codes: Y10T 428/31587 Hydrocarbon polymer [polyethylene, polybutadiene, etc.]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31721 Of polyimide
• CPC Class Codes: Y10T 428/31725 Of polyamide
• CPC Class Codes: Y10T 428/31736 Next to polyester
• CPC Class Codes: Y10T 428/3175 : Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31797 : Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31935 : Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31938 : Polymer of monoethylenically unsaturated hydrocarbon

Abstract

An optical film includes a selective visible light-absorbing layer including at least one dye having a maximum absorption wavelength in a range of about 470 nm to about 510 nm, the selective visible light-absorbing layer having a maximum light transmittance of about 60% or less at the maximum absorption wavelength of the dye and a full width at half maximum of about 50 nm or less.

Claims

1. An optical film, comprising a selective visible light-absorbing layer including at least one dye having a maximum absorption wavelength in a range of about 470 nm to about 510 nm, the selective visible light-absorbing layer having a maximum light transmittance of about 60% or less at the maximum absorption wavelength of the dye and a full width at half maximum of about 50 nm or less.

2. The optical film as claimed in claim 1, wherein the selective visible light-absorbing layer has a maximum light transmittance of 50% or less at the maximum absorption wavelength.

3. The optical film as claimed in claim 1, wherein the dye has a maximum absorption wavelength in the range of about 485 nm to about 495 nm.

4. The optical film as claimed in claim 1, wherein the dye is a cyanine dye.

5. The optical film as claimed in claim 4, wherein the cyanine dye includes one or more of a cyanine compound, a phthalocyanine compound, or a naphthalocyanine compound.

6. The optical film as claimed in claim 5, wherein:

the selective visible light-absorbing layer further includes a color compensating dye, and

the color compensating dye includes one or more of an anthraquinone dye, a perinone dye, a monoazo dye, a disazo dye, or a methine dye.

7. The optical film as claimed in claim 6, wherein the at least one color compensating dye includes a compound represented by one of Formulas 1 to 7 below:

8. The optical film as claimed in claim 6, wherein the selective visible light-absorbing layer includes about 0.0001 to about 30 parts by weight of the color compensating dye, based on 100 parts by weight of a solid content of the selective visible light-absorbing layer.

9. The optical film as claimed in claim 4, wherein the selective visible light-absorbing layer includes about 0.0001 to about 20 parts by weight of the dye and further includes about 10 to about 90 parts by weight of a binder resin, based on 100 parts by weight of a solid content of the selective visible light-absorbing layer.

10. The optical film as claimed in claim 9, wherein the binder resin includes one or more of a melamine resin, a urethane resin, an epoxy resin, a polyester resin, a polyether resin, a polyimide resin, a silicone resin, or an acrylic resin.

11. The optical film as claimed in claim 1, wherein the visible light-absorbing layer is formed on a transparent substrate.

12. The optical film as claimed in claim 11, wherein the transparent substrate includes one or more of polyethylene terephthalate, polyethylene naphthalate, cyclic polyolefin, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, acrylic resin, triacetylcellulose, polyethersulfone, or polyetherketone.

13. The optical film as claimed in claim 11, wherein the selective visible light-absorbing layer is formed by applying a coating solution including the dye, a binder resin, and a solvent on the transparent substrate.

14. An optical filter, comprising at least one layer, wherein:

the layer includes at least one dye having a maximum absorption wavelength in a range of about 470 nm to about 510 nm, and

the layer has a maximum light transmittance of about 60% or less at the maximum absorption wavelength of the dye and a full width at half maximum of about 50 nm or less.

15. The optical filter as claimed in claim 14, wherein the dye is a cyanine dye.

16. The optical filter as claimed in claim 15, wherein the cyanine dye includes one or more of a cyanine compound, a phthalocyanine compound, or a naphthalocyanine compound.

17. A display device, comprising an optical filter having at least one layer, wherein:

the layer includes at least one dye having a maximum absorption wavelength in a range of about 470 nm to about 510 nm, and

the layer has a maximum light transmittance of about 60% or less at the maximum absorption wavelength of the dye and a full width at half maximum of about 50 nm or less.

18. The display device as claimed in claim 17, wherein the dye is a cyanine dye.

19. The display device as claimed in claim 18, further comprising a plasma display panel.

20. The display device as claimed in claim 19, wherein the display device is configured to emit visible light using a discharge gas including neon.