Liquid crystal display and method for lighting the same

• US 20070052663A1
• Filed: 09/01/2006
• Published: 03/08/2007
• Est. Priority Date: 09/05/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Su-gun, Kim, Jung-hyeon, Lee, Jun-young, Cho, Tae-hee, Seong, Ki-bum
• Application Number:
  US11/514,271
• Publication Number:
  US 20070052663A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

The present invention relates to an LCD and a method for improving display thereof where a plurality of LED devices are mounted on a rear of LCD panel, and a partition which allows the plurality of the LED devices to be disposed in a plurality of partitioned areas is provided. The thickness of the partition narrows toward the LCD panel. A power supplier supplies power to the plurality of LED devices, and a controller controls the power supplier to supply the power to the LED device in each divided area sequentially and repeatedly. An LCD with improved contrast ratio while LED devices are separately driven in a plurality of partitioned areas is achieved.

Claims

1. A liquid crystal display (LCD), comprising:

an LCD panel;

a plurality of light emitting diode (LED) devices disposed in back of the LCD panel;

a partition which defines a plurality of partitioned areas, wherein at least one of the plurality of the LED devices is disposed in at least one of the plurality of the partitioned areas, the thickness of the partition get narrower toward the LCD panel;

a power supplier supplying power to at least one of the plurality of LED devices;

a controller controlling the power supplier to supply the power to at least one of the LED devices in at least one of the partitioned areas sequentially and repeatedly.

2. The LCD according to claim 1, wherein at least one of the partitioned areas comprises a rectangular shape, and the partitioned areas are arranged in parallel.

3. The LCD according to claim 1, wherein a size of the partitioned areas is regular.

4. The LCD according to claim 1, wherein the partition is arranged in a lattice shape.

5. The LCD according to claim 1, wherein at least a section of the partition comprises a triangular shape.

6. The LCD according to claim 5, wherein an internal angle of the section at a bottom side of the partition is between 70°

and 85°

.

7. The LCD according to claim 1, wherein at least a section of the partition comprises a trapezoid shape.

8. The LCD according to claim 7, wherein an internal angle of the section at a bottom side of the partition is between 70°

and 85°

.

9. The LCD according to claim 1, wherein at least a section of the partition comprises a stepped shape.

10. The LCD according to claim 1, further comprising:

an LED circuit board comprising at least one of the LED devices; and

a reflecting plate disposed on the LED circuit board and exposing at least one of the LED devices;

wherein the partition is integrated into the reflecting plate in a single body.

11. The LCD according to claim 1, wherein the partition comprises a white color film.

12. The LCD according to claim 1, wherein the partition comprises at least one of polyethylene terephthalate (PET) and polycarbonate (PC).

22. The method according to claim 1, further comprising:

mounting at lest one of the LED devices on an LED circuit board; and

disposing a reflecting plate on the LED circuit board exposing at least one of the LED devices;

wherein the defining of the plurality of the partitioned areas comprises integrating the partition into the reflecting plate in a single body.

13. A method for lighting a liquid crystal display (LCD), comprising:

providing a plurality of light emitting diode (LED) in back of an LCD panel;

defining a plurality of partitioned areas, wherein at least one of the plurality of the LED devices is disposed in at least one of the plurality of the partitioned areas, by a partition of which thickness gets narrower toward the LCD panel; and

supplying power to the LED devices in each of the partitioned areas sequentially and repeatedly.

14. The method according to claim 13, wherein at least one of the partitioned areas comprises a rectangular shape, and the partitioned areas are arranged in parallel.

15. The method according to claim 13, wherein a size of the partitioned areas is regular.

16. The method according to claim 13, wherein the partition is arranged in a lattice shape.

17. The method according to claim 13, wherein at least a section of the partition comprises a triangular shape.

18. The method according to claim 17, wherein an internal angle of the section at a bottom side of the partition is between 70°

and85°

.

19. The method according to claim 13, wherein at least a section of the partition comprises a trapezoid shape.

20. The method according to claim 19, wherein an internal angle of the section at a bottom side of the partition is between 70°

and 85°

.

21. The method according to claim 13, wherein at least a section of the partition comprises a stepped shape.

23. The method according to claim 13, wherein the partition comprises a white color film.