Optical film and light emitting device

• US 9,166,198 B2
• Filed: 03/09/2012
• Issued: 10/20/2015
• Est. Priority Date: 08/25/2011
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chien, Pei-Chi, Kao, I-Ling, Chen, Ping-Chen
• Primary Examiner(s): Roy, Sikha
• Application Number:
  US13/415,845
• Publication Number:
  US 20130049573A1
• Time in Patent Office: 1,320 Days
• Field of Search: 313/503, 313/504, 313/506
• US Class Current: 1/1
• CPC Class Codes: B32B 2264/0235 Aromatic vinyl resin, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 2264/025 Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers
• CPC Class Codes: B32B 2264/0257 Polyolefin particles, e.g. polyethylene or polypropylene homopolymers or ethylene-propylene copolymers
• CPC Class Codes: B32B 2264/0278 Polyester particles
• CPC Class Codes: B32B 2264/104 Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
• CPC Class Codes: B32B 2519/00 Labels, badges
• CPC Class Codes: B32B 27/04 as impregnant, bonding, or embedding substance not used
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/302 comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 3/02 characterised by features of form at particular places, e.g. in edge regions non-uniform thickness B32B3/263
• CPC Class Codes: B32B 5/02 characterised by structural features of a fibrous or filamentary layer layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02
• CPC Class Codes: B32B 5/16 characterised by features of a layer formed of particles, e.g. chips, powder or granules layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02
• CPC Class Codes: B32B 5/18 characterised by features of a layer of foamed material
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: Y10T 428/24372 Particulate matter
• CPC Class Codes: Y10T 428/24405 Polymer or resin [e.g., natural or synthetic rubber, etc.]
• CPC Class Codes: Y10T 428/24413 : Metal or metal compound
• CPC Class Codes: Y10T 428/24421 : Silicon containing

Abstract

An optical film and a light emitting device are provided. The optical film includes a substrate, a resin layer, and a plurality of porous particles. The resin layer is located on the substrate. The porous particles are distributed in the resin layer, and each of the porous particles includes a particle body and a plurality of holes. A refractive index of the particle body is different from a refractive index of the resin layer, and the refractive index of the particle body is different from a refractive index of air in the holes. The light emitting device includes a light emitting element and an optical film. The light emitting element has a light emitting surface, and the optical film is located on the light emitting surface of the light emitting element.

Claims

1. An optical film comprising:

a substrate;

a resin layer located on the substrate;

a plurality of porous particles distributed in the resin layer, each of the porous particles comprising a particle body and a plurality of holes fully filled with air, wherein each of the holes are located inside of the particle body, a refractive index of the particle body is different from a refractive index of the resin layer, and the refractive index of the particle body is different from a refractive index of air in the holes.

2. The optical film as recited in claim 1, wherein the resin layer covering the porous particles has a planar upper surface or an irregular upper surface.

3. The optical film as recited in claim 1, wherein a material of the particle body of each of the porous particles comprises polystyrene, polymethyl acrylate, methyl methacrylate-styrene copolymer, polycarbonate, polyethylene, silicone resin, calcium carbonate, silicon dioxide, titanium dioxide, or a combination thereof.

4. The optical film as recited in claim 1, wherein the resin layer comprises a thermoplastic resin material, a photo-curable resin material, or a combination thereof.

5. The optical film as recited in claim 1, wherein a diameter of each of the porous particles ranges from 0.01 μ

m to 60 μ

m.

6. The optical film as recited in claim 1, wherein the porous particles are circular particles, irregular particles, or a combination thereof.

7. The optical film as recited in claim 1, wherein a weight ratio of the porous particles to the resin layer is 1/99˜

99/1.

8. The optical film as recited in claim 1, further comprising an additive.

9. The optical film as recited in claim 8, wherein the additive comprises at least one non-ionic dispersant, at least one surfactant, or a combination thereof.

10. The optical film as recited in claim 9, wherein an addition ratio of the additive to the particle ranges from 0.005 wt % to 15 wt %.

11. The optical film as recited in claim 1, wherein the substrate is an organic transparent substrate, an inorganic transparent substrate, or a combination thereof.

12. The optical film as recited in claim 1, wherein a thickness of the substrate ranges from 30 μ

m to 300 μ

m.

13. A light emitting device comprising:

a light emitting element having a light emitting surface; and

an optical film located on the light emitting surface of the light emitting element and comprising;

a resin layer; and

a plurality of porous particles distributed in the resin layer, each of the porous particles comprising a particle body and a plurality of holes fully filled with air, wherein each of the holes are located inside of the particle body, a refractive index of the particle body is different from a refractive index of the resin layer, and the refractive index of the particle body is different from a refractive index of air in the holes.

14. The light emitting device as recited in claim 13, wherein the resin layer is in physical contact with the light emitting surface of the light emitting element.

15. The light emitting device as recited in claim 13, wherein the optical film further comprises a substrate, and the resin layer is located on the substrate.

16. The light emitting device as recited in claim 15, further comprising an adhesive layer located between the substrate and the light emitting surface of the light emitting element.

17. The light emitting device as recited in claim 16, wherein the adhesive layer comprises a transparent adhesive containing propyl, a thermal-curable adhesive, or an ultraviolet-curable adhesive.

18. The light emitting device as recited in claim 13, wherein the resin layer covering the porous particles has a planar upper surface or an irregular upper surface.

19. The light emitting device as recited in claim 13, wherein a material of the particle body of each of the porous particles comprises polystyrene, polymethyl acrylate, methyl methacrylate-styrene copolymer, polycarbonate, polyethylene, silicone resin, calcium carbonate, silicon dioxide, titanium dioxide, or a combination thereof.

20. The light emitting device as recited in claim 13, wherein the resin layer comprises a thermoplastic resin material, a photo-curable resin material, or a combination thereof.

21. The light emitting device as recited in claim 13, wherein a diameter of each of the porous particles ranges from 0.01 μ

m to 60 μ

m.

22. The light emitting device as recited in claim 13, wherein the porous particles are circular particles, irregular particles, or a combination thereof.

23. The light emitting device as recited in claim 13, wherein a ratio of the porous particles to the resin layer is 1/99˜

99/1.

24. The light emitting device as recited in claim 13, further comprising an additive.

25. The light emitting device as recited in claim 24, wherein the additive comprises at least one non-ionic dispersant, at least one surfactant, or a combination thereof.

26. The light emitting device as recited in claim 25, wherein an addition ratio of the additive to the particle ranges from 0.005 wt % to 15 wt %.

27. The light emitting device as recited in claim 13, wherein the light emitting element comprises an organic light emitting diode device or a light emitting diode device.