Blacklight assembly and display device having the same

• US 20050280756A1
• Filed: 03/31/2005
• Published: 12/22/2005
• Est. Priority Date: 06/21/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Heu-Gon, Lee, Hea-Chun, Jung, Jae-Ho, Ha, Ju-Hwa
• Application Number:
  US11/097,816
• Publication Number:
  US 20050280756A1
• Time in Patent Office: Days
• US Class Current: 349/114
• 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

Abstract

A compact, light, and uniformly bright backlight assembly and a display device are disclosed. The backlight assembly includes a light source assembly, a substrate, and a transflective member. The light source assembly emits a first light with a first luminance uniformity. Then, the first light passes through the substrate above the light source assembly for producing enhanced luminance uniformity. Again, after the light is reflected from and/or transmitted through the transflective member, the luminance uniformity is even more enhanced. Therefore, the volume, weight, and luminance uniformity of the backlight assembly and the display device are enhanced.

Claims

1. A backlight assembly, comprising:

a light source assembly having a light source and emitting a first light with a first luminance uniformity;

a substrate disposed above the light source assembly and having a first surface facing the light source and a second surface opposing the first surface, wherein the substrate receives the first light and emits a second light with a second luminance uniformity; and

a transflective member partially reflecting and partially transmitting the second light, wherein the light output from the transflective member has a third luminance uniformity higher than the first and second luminance uniformity.

2. The backlight assembly of claim 1, further comprising a power impression board disposed below the light source.

3. The backlight assembly of claim 1, further comprising a light guiding lens disposed at least partially over the light source, wherein the light guiding lens guides the first light within a range of angles between the first surface of the substrate and the light source.

4. The backlight assembly of claim 1, further comprising a light block disposed over the light source.

5. The backlight assembly of claim 1, wherein the light source is a light emitting diode.

6. The backlight assembly of claim 1, wherein the substrate is interposed between the transflective member and the light source assembly.

7. The backlight assembly of claim 1, further comprising a second transflective member between the light source and the substrate.

8. The backlight assembly of claim 1, wherein the transflective member comprises a reflection layer for partially reflecting the second light and a transmission layer for partially transmitting the second light.

9. The backlight assembly of claim 8, wherein the amount of the transmitted light and the reflected light is approximately inversely proportional.

10. The backlight assembly of claim 9, wherein the amount of the reflected light is approximately 70 to 90 percent and the amount of the transmitted light is approximately 10 to 30 percent of the total light directed to the transflective member.

11. The backlight assembly of claim 1, wherein the transflective member is disposed on the second surface of the substrate.

12. The backlight assembly of claim 1, wherein the transflective member comprises a bead located inside of the substrate.

13. The backlight assembly of claim 1, comprising a reflective member disposed between gaps of the light source.

14. The backlight assembly of claim 1, further comprising an optical member.

15. The backlight assembly of claim 14, wherein the optical member is at least one of a diffuser, a prism sheet, and a brightness enhancement film.

16. The backlight assembly of claim 14, wherein the distance between the optical member and the light source is approximately 40 mm or less.

17. A backlight assembly comprising:

a light source assembly emitting a first light with a first luminance uniformity;

a substrate disposed above the light source assembly and having a first surface facing the light source assembly and a second surface opposing the first surface, wherein the substrate receives the first light and emits a second light with a second luminance uniformity;

a transfiective member disposed over the second surface of the substrate for partially reflecting and partially transmitting the second light, wherein the transflective member reflects approximately 70 to 90 percent and transmits approximately 10 to 30 percent of the second light;

a light block between the light source and the substrate; and

an optical member disposed above the transflective member, wherein the optical member is at least one of a diffuser, a prism sheet, and a brightness enhancement film.

18. A display device comprising:

a backlight assembly, comprising;

a light source assembly emitting a first light with a first luminance uniformity;

a substrate receiving the first light and emitting a second light with a second luminance uniformity higher than the first luminance uniformity; and

a transfiective member partially reflecting and partially transmitting the second light, wherein light from the transflective member has a third luminance uniformity higher than the second luminance uniformity; and

a display panel for displaying images by receiving the third light from the transflective member.

19. The display device of claim 18, wherein the transflective member is disposed on a first surface of the substrate, the first surface facing the light source assembly.

20. The display device of claim 18, wherein the substrate is interposed between the light source assembly and the transflective member.

21. The display device of claim 18, wherein the reflective ratio of the transfiective member is approximately 70 to 90 percent and the transmissive ratio of the transflective member is approximately 10 to 30 percent.

22. A method of operating a backlight assembly, the method comprising:

emitting a first light;

receiving the first light by a substrate with a first surface;

emitting a second light from a second surface of the substrate, wherein the second light has higher luminance uniformity than the first light;

partially reflecting the second light; and

partially transmitting the second light having a luminance uniformity higher than the second light.

23. The method of operating a backlight assembly of claim 22, wherein approximately 70 to 90 percent of the second light is reflected and approximately 10 to 30 percent of the second light is transmitted.

24. A method of manufacturing a backlight assembly, the method comprising:

providing a light source assembly at the lower side of the backlight assembly;

disposing a substrate above the light source assembly; and

placing a transflective member over the substrate, wherein the transfiective member reflects approximately 70 to 90 percent and transmits approximately 10 to 30 percent of the incident light.