Direct-lit LCD with reflective plate

• US 7,510,291 B2
• Filed: 01/24/2006
• Issued: 03/31/2009
• Est. Priority Date: 01/24/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sang-hoon, Paek, Jung-wook, Kang, Eun-jeong, Song, Si-joon, Kim, Jin-soo
• Primary Examiner(s): O'Shea; Sandra
• Assistant Examiner(s): CRANSON JR, JAMES W
• Application Number:
  US11/339,261
• Publication Number:
  US 20060164840A1
• Time in Patent Office: 1,162 Days
• Field of Search: 349/113, 362/609, 362/619, 362/97
• US Class Current: 362/97.2
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors

Abstract

The invention provides a reflective plate that includes a first reflective part having a predetermined surface roughness and a second reflective part having a surface roughness that is less than the predetermined surface roughness of the first reflective part. The invention also provides a reflective plate that is capable of supplying a liquid crystal panel with substantially uniform light.

Claims

1. A reflective plate, comprising:

a first reflective part having a predetermined surface roughness; and

a second reflective part having a surface roughness that is less than the predetermined surface roughness of the first reflective part, wherein the first reflective part diffuse-reflects an incident light, and the second reflective part specular-reflects the incident light.

2. The reflective plate of claim 1, wherein the second reflective part comprises a bar-like shape.

3. The reflective plate of claim 2, wherein there is at least two of the second reflective parts that are arranged in parallel with each other.

4. The reflective plate of claim 3, wherein the second reflective parts are spaced apart at a constant interval.

5. The reflective plate of claim 1, wherein the surface roughness of the first reflective part is at least about 700 nm, and the surface roughness of the second reflective part is no greater than 400 nm.

6. The reflective plate of claim 1, further comprising:

a through hole row arranged on the first reflective part, the through hole being parallel with the second reflective part.

7. The reflective plate of claim 6, wherein the through hole row and the second reflective part are alternatively arranged.

8. The reflective plate of claim 6, wherein a width of the second reflective part is about 10 percent to about 40 percent of an interval between the adjacent through hole rows.

14. The reflective plate of claim 8, wherein all of the through hole rows are spaced apart equally.

9. An LCD, comprising:

an liquid crystal panel;

a plurality of LED rows comprising LEDs and arranged in parallel with each other along a rear portion of the liquid crystal panel; and

a reflective plate arranged below the plurality of LED rows, the reflective plate comprising;

a first reflective part having a predetermined surface roughness; and

a second reflective part having a surface roughness that is less than the predetermined surface roughness of the first reflective part, wherein the first reflective part diffuse-reflects an incident light, and the second reflective part specular-reflects the incident light.

10. The LCD of claim 9, wherein the second reflective part is arranged along approximately a center region of an interval between the adjacent LED rows.

11. The LCD of claim 9, wherein a width of the second reflective part is substantially inversely proportional to the interval between the adjacent LED rows.

12. The LCD of claim 9, wherein a width of the second reflective part is about 10 percent to about 40 percent of the interval between the adjacent LED rows.

13. The LCD of claim 9, further comprising:

a LED circuit substrate coupled with the LED, wherein the reflective plate is arranged on the LED circuit substrate.