Optical film including protrusions, display device including the same and method of manufacturing optical film

Patent metadata

Field	Value
Publication number	US-9874666-B2
Application number	US-201414323379-A
Country	US
Kind code	B2
Filing date	Jul 3, 2014
Priority date	Aug 8, 2013
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

An optical film, a display device including the same, and a method of manufacturing the optical film, the film including a first refractive index layer including a plurality of protrusions; a second refractive index layer covering the plurality of protrusions, the second refractive index layer having a refractive index that is different from a refractive index of the first refractive index layer; and a support layer on the first refractive index layer or the second refractive index layer, wherein a ratio of a height to a width of the protrusion is 0.5 or more.

First claim

What is claimed is:

1. An optical film, comprising:
a first refractive index layer including a plurality of protrusions;
a second refractive index layer covering the plurality of protrusions, the second refractive index layer having a refractive index that is different from a refractive index of the first refractive index layer; and
a support layer on the first refractive index layer or the second refractive index layer,
wherein a ratio of a height to a width of the protrusion is greater than 2.0, and
wherein the first refractive index layer further includes a connection portion connecting the plurality of protrusions, the protrusions and the connection portion protruding into the second refractive index layer and the plurality of protrusions extending outwardly at sides of the connection portion.

2. The optical film as claimed in claim 1 , wherein a difference between the refractive index of the first refractive index layer and the refractive index of the second refractive index layer is 0.2 or less.

3. The optical film as claimed in claim 2 , wherein a density of the plurality of protrusions is 90% or less.

4. The optical film as claimed in claim 3 , wherein:
a higher refractive index layer of the first refractive index layer and the second refractive index layer includes:
about 20 to about 50% of epoxy acrylate,
about 50 to about 80% of an acrylate monomer, and
about 1 to about 6% of a photoinitiator, and

a lower refractive index layer of the first refractive index layer and the second refractive index layer includes:
about 20 to about 60% of fluorine urethane acrylate,
about 20 to about 60% of a fluorine acrylate monomer,
about 10 to about 40% of an acrylate monomer, and
about 1 to about 6% of a photoinitiator.

5. The optical film as claimed in claim 3 , wherein each protrusion has a shape of any one of a polygon, a circle, an oval, a quadrangle, a rhombus, or a diamond.

6. The optical film as claimed in claim 3 , wherein at least one of the first refractive index layer or the second refractive index layer further includes a diffusion agent.

7. The optical film as claimed in claim 1 , wherein each protrusion has a shape of any one of a polygon, a circle, an oval, a quadrangle, a rhombus, or a diamond.

8. A display device, comprising:
a display panel; and
an optical film on an entire surface of the display panel,
wherein the optical film includes:
a first refractive index layer including a plurality of protrusions;
a second refractive index layer covering the plurality of protrusions, the second refractive index layer having a refractive index that is different from a refractive index of the first refractive index layer; and
a support layer outside the first refractive index layer or the second refractive index layer,

wherein a ratio of a height to a width of the protrusion is greater than 2.0, and
wherein the first refractive index layer further includes a connection portion connecting the plurality of protrusions, the protrusions and the connection portion protruding into the second refractive index layer and the plurality of protrusions extending outwardly at sides of the connection portion.

9. The display device as claimed in claim 8 , wherein a difference between the refractive index of the first refractive index layer and the refractive index of the second refractive index layer is 0.2 or less.

10. The display device as claimed in claim 9 , wherein a density of the plurality of protrusions is 90% or less.

11. The display device as claimed in claim 10 , wherein:
a higher refractive index layer of the first refractive index layer and the second refractive index layer includes:
about 20 to about 50% of epoxy acrylate,
about 50 to about 80% of an acrylate monomer, and
about 1 to about 6% of a photoinitiator, and

a lower refractive index layer of the first refractive index layer and the second refractive index layer includes:
about 20 to about 60% of fluorine urethane acrylate,
about 20 to about 60% of a fluorine acrylate monomer,
about 10 to about 40% of an acrylate monomer, and
about 1 to about 6% of a photoinitiator.

12. The display device as claimed in claim 10 , wherein each protrusion has a shape of any one of a polygon, a circle, an oval, a quadrangle, a rhombus, or a diamond.

13. The display device as claimed in claim 10 , wherein at least one of the first refractive index layer or the second refractive index layer further includes a diffusion agent.

14. The display device as claimed in claim 10 , wherein:
in the display panel, each pixel includes an organic emission layer, and
the organic emission layer emits light of any one of three primary colors of light.

15. The optical film as claimed in claim 8 , wherein each protrusion has a shape of any one of a polygon, a circle, an oval, a quadrangle, a rhombus, or a diamond.

16. A method of manufacturing an optical film, the method comprising:
forming a high refractive index layer in which a plurality of protrusions is intaglioed by providing a high refractive index resin to a soft mold in which the plurality of protrusions is formed; and
forming a low refractive index layer by providing a low refractive index resin to the intaglioed plurality of protrusions to perform filling,
wherein a ratio of a height to a width of the protrusion is greater than 2.0, and
wherein the high refractive index layer further includes a connection portion connecting the plurality of protrusions, the protrusions and the connection portion protruding into the low refractive index layer and the plurality of protrusions extending outwardly at sides of the connection portion.

17. The method as claimed in claim 16 , further comprising forming a support layer on the high refractive index layer or the low refractive index layer.

18. The method as claimed in claim 17 , wherein, in the forming of the high refractive index layer, the plurality of protrusions is intaglioed in the high refractive index resin by the soft mold in a state where the support layer is formed on one surface of the high refractive index resin.

Assignees

• Samsung Display Co Ltd
• Sekonix Co Ltd
• Sekonix Co Ltd

Inventors

• Lee Duk Jin
• Baik Nam Seok
• Ma Jang Seok
• Son Jung Hee
• Lee Gyeong-Im
• Seo Jung Chul
• Yoon Seok Il
• Lee Chan Hee

Classifications

• G02B5/0236

  the diffusion taking place within the volume of the element · CPC title

• G02B5/00 Primary

  Optical elements other than lenses (light guides G02B6/00; optical logic elements G02F3/00) · CPC title

• Y10T428/24612

  Composite web or sheet · CPC title

• G02B5/021

  the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures · CPC title

• G02B5/0273 Primary

  characterized by the use · CPC title