DISPLAY DEVICE

• US 20150036320A1
• Filed: 01/02/2014
• Published: 02/05/2015
• Est. Priority Date: 07/31/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: HA, JUHWA, HWANG, Seong-Yong, KIM, Dohun, PARK, Young-Min, KANG, Yongkyu, YOON, Byung-Seo, SON, Juyoun
• Granted Patent: US 9,347,651 B2
• Time in Patent Office: Days
• US Class Current: 362/97.1
• CPC Class Codes: F21V 13/02 Combinations of only two kinds of elements
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity

Abstract

A display device includes an optical member, a display panel disposed on the optical member, and a plurality of light emitting units disposed under the optical member, the optical member comprising, a diffusion layer, and a reflectivity control layer which is disposed under the diffusion layer and reflects a light provided from the light emitting units, including a first base material, reflective materials dispersed in the first base material, a plurality of first portions corresponding to the plurality of light emitting units, and a second portion disposed adjacent to the first portions, where each of the plurality of first portions comprises a greater amount of the reflective materials than the second portion, when a first portion and a second portion represent a unit area having a predetermined size.

Claims

1. A display device comprising:

an optical member;

a display panel disposed on the optical member; and

a plurality of light emitting units disposed under the optical member,

the optical member comprising;

a diffusion layer; and

a reflectivity control layer which is disposed under the diffusion layer and reflects a light provided from the light emitting units, including a first base material reflective materials dispersed in the first base material,

wherein the reflective layer comprises a plurality of first portions corresponding to the plurality of light emitting units and a second portion disposed adjacent to the plurality of first portions, and each of the plurality of first portions comprises a greater amount of the reflective materials than the second portion, when each of the plurality of first portions and the second portion respectively represent a unit area having a predetermined size.

2. The display device of claim 1, wherein each of the plurality of first portions of the reflectivity control layer has a thickness greater than a thickness of the second portion of the reflectivity control layer.

3. The display device of claim 2, wherein each of the plurality of first portions comprises convex patterns.

4. The display device of claim 3, wherein each of the convex patterns has a diameter of about 200 micrometers to about 300 micrometers.

5. The display device of claim 3, wherein the plurality of first portions corresponds to the plurality of light emitting units in a one-to-one correspondence.

6. The display device of claim 5, wherein each of the plurality of first portions has a diameter of about 80 millimeters to about 120 millimeters.

7. The display device of claim 2, wherein the second portion comprises concave patterns.

8. The display device of claim 7, wherein each of the concave patterns has a diameter of about 200 micrometers to about 300 micrometer.

9. The display device of claim 1, wherein the reflective materials comprise at least one of titanium dioxide and barium sulfate.

10. The display device of claim 9, wherein the diffusion layer comprises a second base material, and diffusion materials dispersed in the second base material.

11. The display device of claim 10, wherein the diffusion materials comprise silicon dioxide.

12. The display device of claim 10, wherein at least one of the first base material and the second base material comprises a polycarbonate resin.

13. The display device of claim 12, wherein the reflectivity control layer further includes color compensation materials having a light absorptance higher than that of the reflective materials in a long wavelength range and lower than that of the reflective materials in a short wavelength range.

14. The display device of claim 1, wherein

the optical member further comprises a color compensation layer including a third base material, and color compensation materials dispersed in the third base material, and

the color compensation materials have a light absorptance higher than that of the reflective materials in a long wavelength range and lower than that of the reflective materials in a short wavelength range.

15. The display device of claim 13, wherein the color compensation materials comprise aluminum.

16. A display device comprising:

an optical member;

a display panel disposed on the optical member; and

a plurality of light emitting units disposed under the optical member,

the optical member comprising;

a diffusion layer which includes a plurality of first portions corresponding to the plurality of light emitting units and a second portion disposed adjacent to the first portions; and

a plurality of reflective patterns which is disposed on the plurality of first portions and reflects a light provided from the plurality of light emitting units, and includes a first base material, and reflective materials dispersed in the first base material.

17. The display device of claim 16, wherein the reflective materials comprise at least one of titanium dioxide and barium sulfate.

18. The display device of claim 17, wherein the plurality of reflective patterns further includes color compensation materials having a light absorptance higher than that of the reflective materials in a long wavelength range and lower than that of the reflective materials in a short wavelength range.

19. The display device of claim 16, wherein

the optical member further comprises a plurality of color compensation patterns including a second base material, and color compensation materials dispersed in the second base material, and

the color compensation materials have a light absorptance higher than that of the reflective materials in a long wavelength range and lower than that of the reflective materials in a short wavelength range.

20. The display device of claim 19, wherein the color compensation materials comprise aluminum.