Diffuser sheet having base layer with beads and pores and display device having the same

Patent metadata

Field	Value
Publication number	US-10317040-B2
Application number	US-201715678472-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 31, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A diffuser sheet and display device having the same are provided. The diffuser sheet includes a base layer, a first skin layer on an upper surface of the base layer, and a second skin layer on a lower surface of the base layer. The base layer includes a base resin, a plurality of beads dispersed in the base resin, and a plurality of pores dispersed in the base resin.

First claim

What is claimed is:

1. A diffuser sheet, comprising:
a base layer, the base layer including:
a base resin,
a plurality of beads dispersed in the base resin, and
a plurality of pores dispersed in the base resin;

a first skin layer on an upper surface of the base layer; and
a second skin layer on a lower surface of the base layer,
wherein a diameter of the pores is greater than a diameter of the beads.

2. The diffuser sheet according to claim 1 , wherein the first and second skin layers and the base layer are formed of a same resin material, and are integrally attached to each other by coextrusion.

3. The diffuser sheet according to claim 1 , wherein beads and pores are absent in the first and second skin layers.

4. The diffuser sheet according to claim 3 , wherein a surface of each of the first and second skin layers is cured by heat treatment, and
wherein the surface of each of the first and second skin layers has a hardness greater than a hardness of the base layer.

5. The diffuser sheet according to claim 4 , wherein each of the first and second skin layers has a pencil hardness of 3H to 4H, and
wherein the base layer has a pencil hardness of 1H to 2H.

6. The diffuser sheet according to claim 1 , wherein the base layer has a thickness of 200 μm to 1,000 μm, and
wherein each of the first and second skin layers has a thickness of 50 μm to 150 μm.

7. The diffuser sheet according to claim 1 , wherein the pores have a weight ratio higher than a weight ratio of the beads.

8. The diffuser sheet according to claim 1 , wherein the diffuser sheet includes 1.5 wt % to 4.5 wt % of the beads, 5.5 wt % to 8.5 wt % of the pores, and a remaining wt % of the base resin.

9. The diffuser sheet according to claim 1 , wherein the diffuser sheet has an impact strength of 1.0 kJ/m 2 to 1.5 kJ/m 2 .

10. A display device, comprising:
a display panel;
a main supporter under the display panel to support an edge of the display panel;
a cover bottom coupled to the main supporter;
a light source mounted on an upper surface of the cover bottom; and
an optical member seated on the main supporter or the cover bottom, the optical member including at least a diffuser sheet,
wherein the diffuser sheet comprises:
a base layer, the base layer including:
a base resin,
a plurality of beads dispersed in the base resin, and
a plurality of pores dispersed in the base resin;

a first skin layer on an upper surface of the base layer; and
a second skin layer on a lower surface of the base layer, and

wherein a diameter of the pores is greater than a diameter of the beads.

11. The display device according to claim 10 , wherein the diffuser sheet includes 1.5 wt % to 4.5 wt % of the beads, 5.5 wt % to 8.5 wt % of the pores, and a remaining wt % of the base resin.

12. The display device according to claim 10 , wherein the first and second skin layers and the base layer are formed of a same resin material, and are integrally attached to each other by coextrusion.

13. The display device according to claim 10 , wherein beads and pores are absent in the first and second skin layers of the diffuser sheet.

14. The display device according to claim 13 , wherein a surface of each of the first and second skin layers is cured by heat treatment, and
wherein the surface of each of the first and second skin layers has a hardness greater than a hardness of the base layer.

15. The display device according to claim 14 , wherein each of the first and second skin layers has a pencil hardness of 3H to 4H, and
wherein the base layer has a pencil hardness of 1H to 2H.

16. The display device according to claim 10 , wherein the base layer has a thickness of 200 μm to 1,000 μm, and
wherein each of the first and second skin layers has a thickness of 50 μm to 150 μm.

17. The display device according to claim 1 , wherein the pores have a weight ratio higher than a weight ratio of the beads.

18. The display device according to claim 1 , wherein the diffuser sheet has an impact strength of 1.0 kJ/m 2 to 1.5 kJ/m 2 .

19. A diffuser sheet, comprising:
a base layer, the base layer including:
a base resin,
a plurality of beads dispersed in the base resin, and
a plurality of pores dispersed in the base resin;

a first skin layer on an upper surface of the base layer; and
a second skin layer on a lower surface of the base layer
wherein the pores have a weight ratio higher than a weight ratio of the beads.

20. The diffuser sheet according to claim 1 , wherein the diffuser sheet includes 5.5 wt % to 8.5 wt % of the pores.

Assignees

• Lg Display Co Ltd

Inventors

• Chung Donghyun
• Park Jongwan
• Park Kiduck
• Park Junsoo

Classifications

• B32B2307/536

  Hardness · CPC title

• B32B27/302

  comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers · CPC title

• B32B2309/105

  Thickness · CPC title

• B32B7/04

  Interconnection of layers · CPC title

• B32B2264/102

  Oxide or hydroxide · CPC title