OPTICAL MEMBER WITH A SCATTER LAYER, AND BACKLIGHT ASSEMBLY AND DISPLAY DEVICE HAVING THE SAME

• US 20090303414A1
• Filed: 03/20/2009
• Published: 12/10/2009
• Est. Priority Date: 06/05/2008
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Sang-Hoon, CHUNG, Seung-Hwan, CHOI, Jin-Sung, JOO, Byung-Yun, KIM, Dong-Kwan, SONG, Min-Young
• Application Number:
  US12/408,185
• Publication Number:
  US 20090303414A1
• Time in Patent Office: Days
• US Class Current: 349/64
• CPC Class Codes: G02B 5/0226 having particles on the surface
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

A display device includes a backlight assembly including an optical member comprising: a base film; a plurality of linear shaped prisms disposed on the base film and extending in one direction; and a scatter layer underlying the base film and attached to the base film and comprising a coat of beads which is spread under the base film, the scatter layer having a haze value of about 10% to about 30%.

Claims

1. An optical member comprising:

a base film;

a plurality of linear shaped prisms disposed on the base film and extending in one direction; and

a scatter layer underlying the base film and attached to the base film and comprising beads dispersed under the base film, the scatter layer having a haze value of about 10% to about 30%.

2. The optical member of claim 1, wherein the beads'"'"' average diameter is about 1 μ

m to about 7 μ

m.

3. The optical member of claim 2, wherein the beads are made of one or more of a group consisting of PolyMethylMethacrylate (PMMA), PolyStyrene, PolyCarbonate, PolyUrethane, Nylon, Poly Olefin, Silicon (Si), and Silicone.

4. The optical member of claim 1, wherein the thickness of the scatter layer is about 1 μ

m to about 10 μ

m.

5. A backlight assembly comprising:

a light source;

an optical plate comprising a light incident portion for receiving light from the light source, a light emitting portion for emitting the light outside of the optical plate, and a reflecting portion disposed opposite the light emitting portion, the reflecting portion being for reflecting the light received through the light incident portion;

a first optical member disposed over the light emitting portion and comprising a first base film and a plurality of linear shaped prisms; and

a second optical member disposed over the first optical member and comprising a second base film and a plurality of linear shaped prisms,

wherein the first optical member comprises a first scatter layer underlying the first base film and attached to the first base film and comprising beads dispersed under the first base film, the first scatter layer having a haze value of about 10% to about 30%.

6. The backlight assembly of claim 5, wherein the light source is disposed adjacent to the light incident portion of the optical plate.

7. The backlight assembly of claim 6, wherein the optical plate comprises light scattering patterns on the reflecting portion.

8. The backlight assembly of claim 5, wherein the beads'"'"' average diameter is about 1 μ

m to about 7 μ

m.

9. The backlight assembly of claim 8, wherein the beads are made of one or more of a group consisting of Poly Methyl Methacrylate (PMMA), Poly Styrene, Poly Carbonate, Poly Urethane, Nylon, Poly Olefin, Silicon (Si), and Silicone.

10. The backlight assembly of claim 5, wherein the thickness of the first scatter layer is about 1 μ

m to about 10 μ

m.

11. The backlight assembly of claim 9, wherein the second optical member further comprises a second scatter layer underlying the second base film and attached to the second base film and comprising a coat of beads which is spread under the second base film, the second scatter layer having a haze value of about 10% to about 30%.

12. The backlight assembly of claim 5 further comprising a protector sheet disposed over the second optical member, for protecting the second optical member from damage.

13. The backlight assembly of claim 5 further comprising a reflector sheet disposed under the optical plate, the reflector sheet being for reflecting light leaked from the optical plate and re-directing the leaked light back into the optical plate.

14. The backlight assembly of claim 5, wherein the first optical member'"'"'s prisms'"'"' ridges are substantially perpendicular to the second optical member'"'"'s prisms'"'"' ridges.

15. A display device comprising the backlight assembly of claim 5 in combination with a liquid crystal panel, wherein the optical plate is positioned in an optical path extending from the light source to the liquid crystal panel.

16. The display device of claim 15, wherein the light source is disposed adjacent to the light incident portion of the optical plate.

17. The display device of claim 16, wherein the optical plate comprises light scattering patterns on the reflecting portion.

18. The display device of claim 15, wherein the beads'"'"' average diameter is about 1 μ

m to about 7 μ

m.

19. The display device of claim 18, wherein the beads are made of one or more of a group consisting of PolyMethylMethacrylate (PMMA), PolyStyrene, PolyCarbonate, PolyUrethane, Nylon, Poly Olefin, Silicon (Si), and Silicone.

20. The display device of claim 15, wherein the thickness of the first scatter layer is about 1 μ

m to about 10 μ

m.