Composite optical sheet and liquid crystal display device including the same

Patent metadata

Field	Value
Publication number	US-10890697-B2
Application number	US-201715791075-A
Country	US
Kind code	B2
Filing date	Oct 23, 2017
Priority date	Jun 23, 2017
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

Provided are a composite optical sheet and a liquid crystal display device including the same. The composite optical sheet includes: a first optical functional layer having a first surface and a second surface, the first surface including a reference plane and a pattern of recesses dented from the reference plane; a first support layer disposed on the first surface of the first optical functional layer; a first adhesive layer disposed between the first optical functional layer and the first support layer, wherein the first optical functional layer is coupled with the first adhesive layer by penetrating into the first adhesive layer at least partially; a second optical functional layer disposed on the first support layer and including a pattern of prisms extended in a first direction; a polarizing layer disposed on the second optical functional layer; and a second adhesive layer disposed between the second optical functional layer and the polarizing layer, wherein the second optical functional layer is coupled with the second adhesive layer by penetrating into the second adhesive layer at least partially.

First claim

What is claimed is:

1. A composite optical sheet, comprising:
a first optical functional layer having a first surface and a second surface, the first surface comprising a reference plan; and the first optical functional layer comprising a pattern of recesses having a curvature, dented inwardly from the reference plane, the pattern of recesses having different sizes;
a first support layer disposed on the first surface of the first optical functional layer;
a first adhesive layer disposed between the first optical functional layer and the first support layer, wherein the first optical functional layer is coupled with the first adhesive layer by penetrating into the first adhesive layer at least partially;
a second optical functional layer disposed on the first support layer and comprising a pattern of prisms extended in a first direction;
a polarizing layer disposed on the second optical functional layer; and
a second adhesive layer disposed between the second optical functional layer and the polarizing layer, wherein the second optical functional layer is coupled with the second adhesive layer by penetrating into the second adhesive layer at least partially,
wherein a first cross section of the first optical functional layer is different from a second cross section of the second optical functional layer.

2. The composite optical sheet of claim 1 , further comprising:
a second support layer disposed on the second surface of the first optical functional layer and having a surface facing the first optical functional layer and an opposed surface; and
a first bead coating layer disposed on the opposed surface of the second support layer and comprising a plurality of first beads and a first binder resin surrounding the plurality of first beads.

3. The composite optical sheet of claim 2 , further comprising:
a second bead coating layer disposed directly on the polarizing layer and comprising a plurality of second beads and a second binder resin surrounding the plurality of second beads,
wherein a number of the first beads per unit area in the first bead coating layer is smaller than a number of the second beads per unit area in the second bead coating layer.

4. The composite optical sheet of claim 3 , wherein the first optical functional layer and the second optical functional layer are made of a photo-curable resin,
wherein the first binder resin and the second binder resin are made of a thermosetting resin, and
wherein an elasticity of the plurality of first beads is larger than an elasticity of the plurality of second beads.

5. The composite optical sheet of claim 3 , wherein a pitch of the pattern of prisms is equal to three times to seven times of an average particle size of the plurality of second beads in the second bead coating layer.

6. The composite optical sheet of claim 2 , further comprising:
a third support layer disposed between the second adhesive layer and the polarizing layer and being in contact and coupled with the second adhesive layer,
wherein the first support layer, the second support layer, and the third support layer have an in-plane refractive index anisotropy, and
wherein a direction of a slow axis of each of the first support layer, that of the second support layer, and that of the third support layer are parallel to one another.

7. The composite optical sheet of claim 2 , wherein the pattern of prisms comprises:
a first pattern of prisms extended in the first direction and having a first height, and
a second pattern of prisms disposed adjacent to the first pattern of prisms, extended in the first direction, and having a second height that is smaller than the first height,
wherein the first pattern of prisms is coupled with the second adhesive layer by penetrating into the second adhesive layer at least partially, and
wherein the second pattern of prisms is spaced apart from the second adhesive layer.

8. The composite optical sheet of claim 2 , wherein the first optical functional layer is a light-concentrating layer,
wherein a maximum thickness of the first optical functional layer is smaller than a thickness of the first support layer and a thickness of the second support layer,
wherein the first optical functional layer is spaced apart from the first support layer, and
wherein the composite optical sheet is used for an edge-type light source assembly.

9. The composite optical sheet of claim 8 , further comprising:
a second bead coating layer disposed directly on the polarizing layer and comprising a plurality of second beads,
wherein an average width of the pattern of recesses in a second direction intersecting the first direction is larger than an average particle size of the plurality of second beads.

10. The composite optical sheet of claim 9 , wherein the pattern of recesses comprises a first pattern of recesses and a second pattern of recesses,
wherein the second adhesive layer fills the first pattern of recesses and the second pattern of recesses at least partially, and
wherein a level of a surface of the second adhesive layer filling the first pattern of recesses is different from a level of a surface of the second adhesive layer filling the second pattern of recesses.

11. The composite optical sheet of claim 1 , wherein the first optical functional layer comprises more than one pattern of recesses having dots shapes when viewed from a top, and
wherein an area occupied by the reference plane with respect to an overall area of the first optical functional layer ranges from 30% to 50%, when viewed from the top.

12. The composite optical sheet of claim 11 , wherein a width of the pattern of recesses in the first direction is larger than a width of the pattern of recesses in a second direction intersecting the first direction when viewed from the top.

13. The composite optical sheet of claim 11 , wherein the pattern of recesses comprises:
a first pattern of recesses having a cross section that is a part of a first arc having a first curvature radius and a first depth, and
a second pattern of recesses having a cross section that is a part of a second arc having the first curvature radius and a second depth that is larger than the first depth.

14. The composite optical sheet of claim 11 , wherein the pattern of recesses comprises:
a first pattern of recesses having a first depth and a first width in the first direction that is larger than the first depth, and
a second pattern of recesses having a second depth and a second width in the first direction that is smaller than the second depth.

15. The composite optical sheet of claim 1 , wherein a cross section of each of the pattern of recesses is a part of an arc or elliptical arc.

16. A liquid-crystal display device comprising:
a light guide plate;
a liquid-crystal display panel disposed on the light guide plate;
a composite optical sheet interposed between the light guide plate and the liquid-crystal display panel; and
a light source disposed on a side of the light guide plate in a first direction,
wherein the composite optical sheet comprises:
a first optical functional layer having a first surface and a second surface, the first surface comprising a reference plane, and the first optical functional layer comprising a pattern of recesses having a curvature and dented inwardly from the reference plane, the pattern of recesses having different sizes;
a first support layer disposed on the first surface of the first optical functional layer;
a first adhesive layer disposed between the first optical functional layer and the first support layer, wherein the first optical

Assignees

• Samsung Display Co Ltd

Inventors

• Park Young Min
• Kim Do Hun
• Kim Hyun Hyang
• Nam Ji Eun
• Shin Taek Sun

Classifications

• G02F1/133504 Primary

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02F1/13356

  characterised by the placement of the optical elements · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02B5/0226 Primary

  having particles on the surface · CPC title