BACKLIGHT ASSEMBLY AND DISPLAY APPARATUS HAVING THE SAME

• US 20090309498A1
• Filed: 04/07/2009
• Published: 12/17/2009
• Est. Priority Date: 06/13/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PARK, Sang-Il, KIM, Gi-Cherl, PARK, Se-Ki, CHANG, Moon-Hwan, SONG, Si-Joon
• Granted Patent: US 8,289,267 B2
• Time in Patent Office: Days
• US Class Current: 315/32
• CPC Class Codes: G02F 1/133601 for spatial active dimming
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: H05K 1/141 One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters H05K1/142 and H05K1/147 take precedence
• CPC Class Codes: H05K 1/148 Arrangements of two or more hingeably connected rigid printed circuit boards, i.e. connected by flexible means

Abstract

A backlight assembly includes a main circuit board having a light-generating part, a control circuit board which provides a control signal for controlling the light-generating part, and a sub-circuit board which is electrically connected to the control circuit board and receives the control signal, the sub-circuit board including a buffer which generates an amplified control signal in response to the control signal, and where the sub-circuit board is electrically connected to the main circuit board and provides the amplified control signal. The control circuit board and the main circuit board are electrically connected by the sub-circuit board, and the sub-circuit board amplifies the control signal received from the control circuit board and provides the control signal to the main circuit board.

Claims

1. A backlight assembly, comprising:

a main circuit board having a light-generating part;

a control circuit board which provides a control signal to control the light-generating part; and

a sub-circuit board which is electrically connected to the control circuit board and receives the control signal, the sub-circuit board including a buffer which generates an amplified control signal in response to the control signal, wherein the sub-circuit board is electrically connected to the main circuit board and provides the amplified control signal.

2. The backlight assembly of claim 1, wherein the light-generating part comprises:

a light source; and

a light-driving chip which drive the light source.

3. The backlight assembly of claim 2, wherein the main circuit board includes a first connector electrically connected the buffer, the first connector dividing the amplified control signal to form a plurality of divided amplified control signals, and wherein each of the divided amplified control signals is provided to the light-driving chip.

4. The backlight assembly of claim 2, wherein the light source includes a red diode, a green diode and a blue diode,

and the light-driving chip includes a first light-driving chip electrically connected to the red diode, a second light-driving chip electrically connected to the green diode, and a third light-driving chip electrically connected to the blue diode.

5. The backlight assembly of claim 1, further comprising a power circuit board electrically connected to the sub-circuit board, wherein the power circuit board includes a power-generating part which provides a first power signal to the sub-circuit board.

6. The backlight assembly of claim 5, wherein the sub-circuit board further comprises a regulator electrically connected to the power circuit board and receiving the first power signal from the power circuit board, the regulator transforming the first power signal to a second power signal and providing the second power signal to the buffer,

and wherein the buffer generates an amplified power signal in response to the second power signal received from the regulator.

7. The backlight assembly of claim 6, wherein the main circuit board includes a first connector electrically connected the sub-circuit board, the first connector dividing each of the amplified control signal and the amplified power signal to form a plurality of divided amplified control signals and a plurality of divided amplified power signals, and wherein each of the divided amplified control signals and each of the divided amplified power signals are provided to each of a plurality of light-driving chips.

8. The backlight assembly of claim 7, wherein the sub-circuit board includes a data output connector electrically connected to the first connector by a first connecting member, the data output connector receiving the amplified power signal and the amplified control signal from the buffer and providing the amplified power signal and the amplified control signal to the main circuit board.

9. The backlight assembly of claim 5, wherein the sub-circuit board includes a power input connector electrically connected the power circuit board, the power input connector receiving the first power signal.

10. The backlight assembly of claim 9, wherein the power-generating part generates a driving voltage which drives a light-driving chip, and the power input connector receives the first power signal and the driving voltage.

11. The backlight assembly of claim 10, wherein the sub-circuit board includes a power output connector electrically connected to the main circuit board which provides the driving voltage.

12. The backlight assembly of claim 11, wherein the main circuit board includes a second connector electrically connected to the power output connector by a second connecting member, the second connector providing the driving voltage to the light-driving chip, wherein the driving voltage is unchanged, the driving voltage passing from the sub-circuit board to the power output connector.

13. The backlight assembly of claim 5, wherein the sub-circuit board includes a data input connector electrically connected to the main circuit board which receives the control signal.

14. The backlight assembly of claim 13, wherein the control circuit board generates a data signal which drives the light-driving chips, and the data input connector receives the data signals.

15. A display apparatus, comprising:

a display panel which displays an image using light; and

a backlight assembly disposed under the display panel which provides the light,

wherein the backlight assembly includes;

a main circuit board comprising a light-generating part;

a control circuit board which provides a control signal which controls the light-generating part; and

a sub-circuit board which is electrically connected to the control circuit board and receives the control signal, the sub-circuit board including a buffer which generates an amplified control signal in response to the control signal, and wherein the sub-circuit board is electrically connected to the main circuit board and provides the amplified control signal.

16. The display apparatus of claim 15, wherein the light-generating part comprises:

a light source; and

a light-driving chip which drive the light source.

17. The display apparatus of claim 15, further comprising a power circuit board including a power-generating part which provides a first power signal to the sub-circuit board, the power circuit board electrically connected the sub-circuit board.

18. The display apparatus of claim 17, wherein the sub-circuit board further comprises a regulator which is electrically connected to the power circuit board and receives the first power signal from the power circuit board, transforms the first power signal to a second power signal, and provides the second power signal to the buffer,

and wherein the buffer generates an amplified power signal in response to the second power signal received from the regulator.

19. The display apparatus of claim 18, wherein the sub-circuit board includes:

a data input connector which is electrically connected to the control circuit board and receives the control signal from the control circuit board; and

a data output connector which is electrically connected to the main circuit board and provides the amplified control signal to the main circuit board.

20. The display apparatus of claim 18, wherein the sub-circuit board includes:

a power input connector which is electrically connected to the power circuit board and receives the first power signal from the power circuit board; and

a power output connector which is electrically connected to the main circuit board and provides a driving voltage generated in the power circuit board to the main circuit board, the driving voltage driving a plurality of light-driving chips.