BACKLIGHT ASSEMBLY, DISPLAY APPARATUS HAVING THE SAME, METHOD FOR DRIVING THE SAME, AND METHOD FOR DRIVING THE DISPLAY APPARATUS

• US 20090051643A1
• Filed: 04/14/2008
• Published: 02/26/2009
• Est. Priority Date: 08/20/2007
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: CHA, Ki-Seok, YEON, Yeun-Mo
• Application Number:
  US12/102,080
• Publication Number:
  US 20090051643A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2310/0237 Switching ON and OFF the backlight within one frame
• 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 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: H05B 41/282 with semiconductor devices H05B41/2806, H05B41/288, H05B41/295 take precedence
• CPC Class Codes: H05B 41/38 Controlling the intensity of light
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

In a backlight assembly, a display apparatus having the backlight assembly, a method for driving the backlight assembly and a method for driving the display apparatus, the backlight assembly includes a plurality of light sources and a light source driving unit. The light sources are disposed along a direction and emit light. The light source driving unit causes the light sources to sequentially emit light along the direction, and causes each of the light sources to emit light during a first emitting period of a time period, and then causes each of the light sources to emit light during a second emitting period of the time period. The time period is substantially the same as a single frame. Accordingly, each of the light sources emits light again after the light sources have emitted light once, so that motion blur in the display apparatus may be decreased.

Claims

1. A backlight assembly comprising:

a plurality of light sources disposed along a direction and emitting light; and

a light source driving unit which causes the light sources to sequentially emit light along the direction, and which causes each of the light sources to emit light during a first emitting period of a time period and then causes each of the light sources to emit light during a second emitting period of the time period, the time period being substantially same as a single frame.

2. The backlight assembly of claim 1, wherein the second emitting period is longer than the first emitting period.

3. The backlight assembly of claim 1, wherein the light source driving unit further causes each of the light sources to emit light during a third emitting period of the time period after causing each of the light sources to emit light during the second emitting period of the time period.

4. The backlight assembly of claim 3, wherein the second emitting period is separated from the first emitting period by a first non-emitting period and the third emitting period is separated from the second emitting period by a second non-emitting period.

5. The backlight assembly of claim 3, wherein the third emitting period is longer than the first emitting period.

6. The backlight assembly of claim 5, wherein the third emitting period is substantially same in duration as the second emitting period.

7. The backlight assembly of claim 1, wherein the light source driving unit comprises:

power supply parts electrically connected to the light sources, respectively, and which provide driving power sources to the light sources; and

a light source control part which controls the power supply parts, so that the light sources sequentially emit light along the direction and each of the light sources emits light during the second emitting period after each of the light sources emits light during the first emitting period.

8. The backlight assembly of claim 1, wherein the light source driving unit causes the light sources to emit light during the second emitting period of the time period after a non-emitting period following the first emitting period has elapsed.

9. A display apparatus comprising:

a display module which displays an image; and

a backlight assembly including;

a plurality of light sources which are disposed along a first direction and emit light; and

a light source driving unit which causes the light sources to sequentially emit light along the first direction corresponding to a timing of the image displayed on the display module, and which causes each of the light sources to emit light during a first emitting period of a time period, and then causes each of the light sources to emit light during a second emitting period of the time period, the time period being substantially same as a single frame.

10. The display apparatus of claim 9, wherein the display module comprises:

a liquid crystal display panel including a plurality of gate lines arranged along the first direction with respect to each other and a plurality of data lines arranged with respect to each other along a second direction substantially perpendicular to the first direction, and which displays the image by changing a longitudinal arrangement direction of liquid crystals;

a gate driving part sequentially providing gate signals to the gate lines along the first direction;

a data driving part providing data signals to the data lines; and

a timing control part controlling the gate and data driving parts.

11. The display apparatus of claim 10, wherein the light source driving unit causes each of the light sources to emit light during the first emitting period, after movements of the liquid crystals are over.

12. The display apparatus of claim 10, wherein the light source driving unit causes the light sources to sequentially emit light along the first direction corresponding to a timing of the gate signals.

13. The display apparatus of claim 12, wherein the timing control part provides a vertical start signal to the light source driving unit, and the vertical start signal informs of a start or an end of the single frame to display a single screen image.

14. The display apparatus of claim 13, wherein the light source driving unit comprises:

power supply parts electrically connected to the light sources, respectively, and which provide driving power sources to the light sources; and

a light source control part which controls the power supply parts, so that the light sources sequentially emit light along the first direction and each of the light sources emits light during the second emitting period after each of the light sources emits light during the first emitting period.

15. The display apparatus of claim 9, wherein the second emitting period is longer than the first emitting period.

16. The backlight assembly of claim 9, wherein the light source driving unit causes the light sources to emit light during the second emitting period of the time period after a non-emitting period following the first emitting period has elapsed.

17. A method for driving a backlight assembly, the method comprising:

causing each of light sources to emit light during a first emitting period of a time period, the time period being substantially same as a single frame, the light sources being sequentially emitted along a direction; and

emitting each of the light sources during a second emitting period of the time period, after causing each of the light sources to emit light during the first emitting period of the time period.

18. The method of claim 17, wherein the second emitting period is longer than the first emitting period.

19. The method of claim 17, further comprising causing each of the light sources to emit light during a third emitting period of the time period, after causing each of the light sources to emit light during the second emitting period of the time period.

20. The method of claim 19, wherein the third emitting period is longer than the first emitting period.

21. The method of claim 17, wherein the light source driving unit causes the light sources to emit light during the second emitting period of the time period after a non-emitting period following the first emitting period has elapsed.

22. A method for driving a display apparatus, the method comprising:

sequentially applying gate signals to a display panel along a direction; and

sequentially emitting light sources along the direction, the light sources being synchronized with the gate signals,

wherein the light sources sequentially emit light by;

causing each of the light sources to emit light during a first emitting period of a time period, the time period being substantially same as a single frame; and

causing each of the light sources to emit light during a second emitting period of the time period, after causing each of the light sources to emit light during the first emitting period of the time period.

23. The method of claim 22, wherein each of the light sources emits light during the first emitting period by:

changing a longitudinal arrangement direction of liquid crystals in the display panel using the gate signals and using data signals; and

causing each of the light sources to emit light during the first emitting period, after movements of the liquid crystals are over.

24. The method of claim 22, wherein the second emitting period is longer than the first emitting period.

25. The method of claim 22, wherein the light source driving unit causes the light sources to emit light during the second emitting period of the time period after a non-emitting period following the first emitting period has elapsed.