Light control film having nano light absorbing layer and display using the same

Patent metadata

Field	Value
Publication number	US-11867932-B2
Application number	US-202016913424-A
Country	US
Kind code	B2
Filing date	Jun 26, 2020
Priority date	Jul 2, 2019
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

The present disclosure relates to a light control film having nano (or nano-scale) light absorbing layer and a display using the same. A light control film according to the present disclosure includes a lower layer having a first axis and a second axis, a middle layer having a predetermined thickness disposed between the lower layer and the upper layer, and a plurality of nano light absorbing layers arrayed with a predetermined intercals along the first axis in the middle layer, each of the nano light absorbing layer having a width along the first axis, a length along the second axis and a height corresponding to the thickness of the middle layer, wherein a ratio between the interval and the width of the nano light absorbing layer is selected from any one of 10:1 to 20:1.

First claim

What is claimed is:

1. A light control film comprising:
a lower layer having a first axis and a second axis;
a middle layer having a thickness disposed between the lower layer and an upper layer; and
a plurality of nano light absorbing layers arrayed with predetermined intervals along the first axis in the middle layer, each of the nano light absorbing layer having a width along the first axis, a length along the second axis and a height corresponding to the thickness of the middle layer,
wherein a ratio between the interval and the width of the nano light absorbing layer is in a range of 10:1 to 20:1,
wherein the plurality of nano light absorbing layers includes a first nano light absorbing layer and a second nano light absorbing layer neighboring with the interval between each other, and
wherein the middle layer includes a lower prism part and an upper prism part, the lower prism part positioned at a lower area based on an inclined surface connecting from an upper end of the first nano light absorbing layer to a lower end of the second nano light absorbing layer, and the upper prism part positioned at an upper area based on the inclined surface.

2. The light control film according to claim 1 , wherein the width of the nano light absorbing layer is in a range of 0.1 μm to 1.0 μm.

3. The light control film according to claim 1 , wherein the ratio between the interval and the height of the nano light absorbing layer is in a range of 1:1 to 1:4.

4. The light control film according to claim 1 , wherein each of the lower layer, the middle layer, and the upper layer have refractive indices higher than that of air, respectively.

5. The light control film according to claim 1 , wherein each of the nano light absorbing layer has at least two thin layers stacked with each other.

6. The light control film according to claim 5 , wherein any one thin layer of the nano light absorbing layer has a film thickness in a range of 0.01 μm to 0.1 μm.

7. The light control film according to claim 1 , wherein the nano light absorbing layer includes:
a first thin layer having a first reflection ratio; and
a second thin layer having a second reflection ratio different from the first reflection ratio.

8. The light control film according to claim 7 , wherein the nano light absorbing layer further includes a third thin layer having a third reflection ratio different from the first reflection ratio and the second reflection ratio.

9. The light control film according to claim 1 , wherein the nano light absorbing layer includes:
a first thin layer having a first transmittance ratio; and
a second thin layer having a second transmittance ratio different from the first transmittance ratio.

10. The light control film according to claim 9 , wherein the nano light absorbing layer further includes a third thin layer having a third transmittance ratio different from the first transmittance ratio and the second transmittance ratio.

11. The light control film according to claim 1 , wherein the lower prism part has a first refractive index, and
wherein the upper prism part has a second refractive index lower than the first refractive index.

12. The light control film according to claim 1 , wherein the upper layer, the lower layer, and the middle layer include a transparent organic material, and
wherein the nano light absorbing layer includes a material absorbing visible lights.

13. The light control film according to claim 12 , wherein the nano light absorbing layer includes at least selected one of silicon nitride (SiN), titanium nitride (TiN), silicon carbide (SiC), Tantalium (Ta), Titanium (Ti), Tungsten (W), Nickel (Ni), copper oxide (CuO), aluminum oxide (Al2O3), iron oxide (Fe3O4), nickel oxide (NiO) and tantalium oxide (Ta2O5).

14. The light control film according to claim 1 , wherein the nano light absorbing layer is disposed as being slanted at a predetermined angle in one direction based on a normal direction of a plan surface of the light control film.

15. The light control film according to claim 14 , wherein the nano light absorbing layer has a refractive index lower than refractive indices of the upper layer, the lower layer, and the middle layer.

16. The light control film according to claim 14 , wherein the upper layer, the lower layer, and the lower prism part have a first refractive index,
wherein the upper prism part has a second refractive index lower than the first refractive index, and
wherein the nano light absorbing layer has a third refractive index lower than the second refractive index.

17. The light control film according to claim 16 , wherein the inclined surface of the middle layer is slanted as being crossing with a viewing angle direction having narrower than an opposite direction based on the slanted direction of the nano light absorbing layer.

18. A display comprising:
a substrate having a plurality of pixels;
an emission layer including a driving element and a light emitting element disposed at each of pixels;
an encapsulation layer covering the emission layer;
an optical layer on the encapsulation layer;
a cover plate on the optical layer; and
the light control film according to claim 1 .

Assignees

• Lg Display Co Ltd

Inventors

• Han Jaejung
• Kim Jaejin
• Kim Jinryun
• Lee Semin
• Kim Daeyong
• Choi Eunhee

Classifications

• G02B5/22 Primary

  Absorbing filters {(G02B5/201 - G02B5/208 take precedence)} · CPC title

• G02B5/003 Primary

  Light absorbing elements · CPC title

• G02B2207/123

  Optical louvre elements, e.g. for directional light blocking · CPC title