Optical film and display device comprising the same

Patent metadata

Field	Value
Publication number	US-11181774-B2
Application number	US-201816148186-A
Country	US
Kind code	B2
Filing date	Oct 1, 2018
Priority date	Nov 8, 2017
Publication date	Nov 23, 2021
Grant date	Nov 23, 2021

Abstract

An optical film and a display device including the same are disclosed, in which an image of the display device is prevented from being irradiated to an unwanted place and luminance is prevented from being deteriorated. The optical film includes a first base film; a second base film spaced apart from the first base film to face the first base film; an optical pattern arranged between the first base film and the second base film, having an inclined surface inclined at a certain angle; and a reflective member arranged at one side of the optical pattern.

First claim

What is claimed is:

1. An optical film, comprising:
a first base film;
a second base film spaced apart from the first base film to face the first base film;
a plurality of optical patterns between the first base film and the second base film, and having an inclined surface inclined at a certain angle;
a reflective member and an absorption member at only a same one side of each of the plurality of optical patterns; and
a light transmitting layer between the first base film and the second base film, the light transmitting layer covering the plurality of optical patterns,
wherein the light transmitting layer is a same material as that of the plurality of optical patterns,
wherein the first base film and the second base film are spaced apart by a same distance, and
wherein the second base film and each optical pattern are spaced apart from each other.

2. The optical film according to claim 1 , wherein each of the plurality of optical patterns has a prism shape.

3. The optical film of claim 1 , wherein each of the plurality of optical patterns has:
a first angle formed by one side on which the reflective member is arranged and the first base film; and
a second angle formed by an opposite side of the one side and the first base film, the first angle being greater than the second angle.

4. The optical film of claim 1 , wherein the light transmitting layer has the same refractive index as that of the plurality of optical patterns.

5. The optical film of claim 1 , wherein the absorption member is disposed between the one side of the plurality of optical patterns and the reflective member.

6. The optical film of claim 5 , wherein:
the light transmitting layer covers the reflective member and other side of opposite to the one side of the optical pattern; and
the light transmitting layer directly contacts the first base film between the reflective member and the other side of the plurality of optical patterns.

7. A display device, comprising:
a printed circuit board;
light sources packaged in the printed circuit board;
an optical sheet portion arranged on the light sources;
the optical film according to claim 1 arranged on the optical sheet portion; and
a liquid crystal panel arranged on the optical film.

8. The display device according to claim 7 , wherein each of the plurality of optical patterns has a prism shape.

9. The display device according to claim 7 , wherein each of the plurality of optical patterns has:
a first angle formed by one side on which the reflective member is arranged and the first base film; and
a second angle formed by an opposite side of the one side and the first base film, the first angle being greater than the second angle.

10. The display device according to claim 7 , wherein:
the plurality of optical patterns is arranged on the first base film; and
the plurality of optical patterns further includes a light transmitting layer between the first base film and the second base film.

11. The display device according to claim 7 , further comprising an absorption member between the plurality of optical patterns and the reflective member.

12. The optical film of claim 1 , wherein the reflective member and the absorption member are both inclined at the certain angle.

13. The optical film according to claim 1 , wherein the reflective member reflects light incident through the first base film toward the second base film.

14. The optical film according to claim 1 , further comprising:
a plurality of gap spaces between the plurality of optical patterns,
wherein the light transmitting layer directly contacts the first base film in each of the plurality of gap spaces between the plurality of optical patterns.

15. An optical film, comprising:
a first light transmitting layer;
a second light transmitting layer spaced apart from the first light transmitting layer to face the first light transmitting layer;
a plurality of base films between the first light transmitting layer and the second light transmitting layer, the plurality of base films being spaced apart from each other to face each other;
a reflective member and an absorption member between the plurality of base films, any one of the reflective member and the absorption member being coated on one side of the each of the plurality of base films; and
an adhesive member between the other of the reflective member and the absorption member and the other side of the each of the plurality of base films.

16. The optical film according to claim 15 , wherein:
the plurality of base films comprises:
a first base film; and
a second film; and

the first and second base films, the reflective member, and the absorption member each are disposed parallel to each other between a first light transmitting layer and the second light transmitting layer.

17. The optical film according to claim 15 , wherein:
the plurality of base films comprises a first base film and a second film;
the reflective member is disposed between the first base film and the second base film; and
the absorbing member is disposed between the reflective member and the second base film.

18. A display device, comprising:
a printed circuit board;
light sources packaged in the printed circuit board;
an optical sheet portion arranged on the light sources;
the optical film according to claim 15 arranged on the optical sheet portion; and
a liquid crystal panel arranged on the optical film.

19. The display device according to claim 15 , wherein:
the plurality of reflective members is coated on one side of the each of the plurality of base films;
the plurality of absorption members is coated on one side of each of the plurality of reflective members; and
the adhesive member is in contact with each of the plurality of the absorption members and the other side of the each of the plurality of base films.

Assignees

• Lg Display Co Ltd

Inventors

• Gwon Seungju
• Yoon Hyeokjoon
• Lee Semin

Classifications

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02B5/201 Primary

  in the form of arrays · CPC title

• G02F1/133605 Primary

  including specially adapted reflectors · CPC title

• G02B5/26

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title