Display device including optical member having optical patterns

Patent metadata

Field	Value
Publication number	US-9817176-B2
Application number	US-201514979811-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 29, 2014
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A display device includes a backlight assembly and a display panel which displays an image. The backlight assembly includes a light emitting unit which generates light, and an optical member which adjusts a path of the light incident thereto and outputs the light toward the display panel. The optical member includes a first base film to which the light is incident, a second base film closer to the display panel than the first base film and for which are defined first and second areas alternately disposed, a first optical pattern between the first and second base films at the first area, where the first optical pattern refracts therein the light incident to the first base film, and a second optical pattern between the first and second base films at the second area, where the second optical pattern scatters the light incident to the first base film.

First claim

What is claimed is:

1. A display device comprising:
a backlight assembly which generates light; and
a display panel which displays an image with the light generated by the backlight assembly,
wherein the backlight assembly comprises:
a light emitting unit which generates the light, and
an optical member to which the light generated by the light emitting unit is incident, wherein the optical member adjusts a path of the light incident thereto, the light for which the path thereof is adjusted is output from the optical member toward the display panel,

wherein the optical member comprises
a first base film to which the light generated by the light emitting unit is incident;
a second base film for which are defined a first area and a second area alternately disposed, the second base film facing the first base film to be disposed closer to the display panel than the first base film;
a first optical pattern between the first and second base films at the first area of the second base film, wherein the first optical pattern refracts therein the light incident to the first base film; and
a second optical pattern between the first and second base films at the second area of the second base film, wherein the second optical pattern scatters the light incident to the first base film.

2. The display device of claim 1 , wherein the first optical pattern between the first and second base films at the first area of the second base film comprises:
a lower surface contacting the first base film, and
an upper surface contacting the second base film,
wherein a size of the lower surface is greater than that of the upper surface.

3. The display device of claim 2 , wherein in a plan view, the upper surface is disposed inside the lower surface.

4. The display device of claim 2 , wherein
a space is defined between adjacent first optical patterns, and
the second optical pattern and a material which is separate from the second optical pattern are each disposed in the space defined between the adjacent first optical patterns.

5. The display device of claim 4 , wherein
the second optical pattern in the space defined between the adjacent first optical patterns contacts the material disposed in the space defined between the adjacent first optical patterns, and
a surface of the second optical pattern contacting the material disposed in the space defined between the adjacent first optical patterns has a concavo-convex shape.

6. The display device of claim 4 , wherein
the first optical pattern between the first and second base films at the first area of the second base film further comprises a side surface connecting the lower surface to the upper surface, and
the side surface connecting the lower surface to the upper surface is inclined with respect to each of the lower and upper surfaces.

7. The display device of claim 4 , wherein in a cross-section, the first optical pattern between the first and second base films at the first area of the second base film has a tapered shape.

8. The display device of claim 4 , wherein
the first optical pattern between the first and second base films at the first area of the second base film further comprises a side surface connecting the lower surface to the upper surface, and
the side surface connecting the lower surface to the upper surface has a curved shape.

9. The display device of claim 8 , wherein in a plan view, the first optical pattern has a discrete dot shape.

10. The display device of claim 9 , wherein in the plan view,
the first optical pattern having the discrete dot shape is provided in plural, and
the plurality of the first optical patterns having the discrete dot shape is arranged in a first direction and a second direction which crosses the first direction.

11. The display device of claim 4 , wherein
the backlight assembly further comprises a light guide plate facing the display panel with the optical member interposed therebetween, and
the light emitting unit comprises a plurality of light emitting diode packages arranged in a first direction along a side portion of the light guide plate facing the display panel with the optical member interposed therebetween.

12. The display device of claim 11 , wherein in a plan view, the first optical pattern has a line shape extended in the first direction.

13. The display device of claim 12 , wherein in the plan view,
the first optical pattern having the line shape is provided in plural, and
the plurality of the first optical patterns having the line shape is arranged in a second direction crossing the first direction.

14. The display device of claim 11 , wherein the optical member is adhered to the light guide plate.

15. The display device of claim 4 , wherein of the second optical pattern in the space defined between the adjacent first optical patterns has a greater refractive index than that of the material disposed in the space defined between the adjacent first optical patterns.

16. The display device of claim 4 , wherein refractive indices of the first optical pattern, the second optical pattern and the second base film are the same.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Joonghyun
• Son Juyoun
• Lee Kang-Woo
• Chung Seunghwan

Classifications

• G02B6/0086

  Positioning aspects · CPC title

• G02B6/0046

  Tapered light guide, e.g. wedge-shaped light guide · CPC title

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G02B6/0051 Primary

  Diffusing sheet or layer · CPC title