DISPLAY DEVICE

• US 20120050346A1
• Filed: 07/13/2011
• Published: 03/01/2012
• Est. Priority Date: 08/26/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Sung, Si-Duk, Han, Sang Myeon
• Granted Patent: US 9,129,560 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element

Abstract

A display device includes: a display panel for displaying frames during an elapse of time; and an emission driver for providing first and second emission power sources to the display panel, wherein: each of the frames comprises a first light emitting period, a light non-emitting period and a second light emitting period according to a time sequence, a difference value between the first and second emission power sources is substantially equal to or greater than a reference value during the first and second light emitting periods, and is less than the reference value during the light non-emitting period, and the difference value between the first and second emission power sources decreases over an elapse of time during the first light emitting period, and increases over an elapse of time during the second light emitting period.

Claims

1. A display device comprising:

a display panel for displaying frames during an elapse of time; and

an emission driver for providing first and second emission power sources to the display panel,

wherein;

each of the frames comprises a first light emitting period, a light non-emitting period and a second light emitting period according to a time sequence,

a difference value between the first and second emission power sources is substantially equal to or greater than a reference value during the first and second light emitting periods, and is less than the reference value during the light non-emitting period, and

the difference value between the first and second emission power sources decreases over an elapse of time during the first light emitting period, and increases over an elapse of time during the second light emitting period.

2. The display device of claim 1, wherein a variation in the difference value between the first and second emission power sources is about 0.5 V to 3.5 V.

3. The display device of claim 1, wherein:

the second emission power source is maintained at a substantially constant value that is less than that of the first emission power source,

the first emission power source has a first level during the first and second light emitting periods and a second level during the light non-emitting period, the first level being higher than the second level, and

the first level decreases from a first voltage value to a second voltage value during the first light emitting period.

4. The display device of claim 3, wherein:

the first voltage value is a maximum value of the first level, and

the second voltage value is a minimum value of the first level.

5. The display device of claim 4, wherein the first level has the first voltage value at a starting point of the first light emitting period, and has the second voltage value at an end point of the first light emitting period.

6. The display device of claim 3, wherein the first level increases from the second voltage value to the first voltage value over an elapse of time, during the second light emitting period.

7. The display device of claim 6, wherein the first level has the second voltage value at a starting point of the second light emitting period, and has the first voltage value at an end point of the second light emitting period.

8. The display device of claim 1, wherein:

the first emission power source is maintained at a substantially constant value higher than the second emission power source,

the second emission power source has a first level during the light non-emitting period and a second level during the first and second light emitting periods, the first level being higher than the second level, and

the second level increases from a third voltage value to a fourth voltage value during the first light emitting period, and decreases from the fourth voltage value to the third voltage value during the second light emitting period.

9. The display device of claim 8, wherein:

the third voltage value is a minimum value of the second level, and

the fourth voltage value is a maximum value of the second level.

10. The display device of claim 9, wherein the second level has the third voltage value at a starting point of the first light emitting period and an end point of the second light emitting period, and has the fourth voltage value at an end point of the first light emitting period and a starting point of the second light emitting period.

11. A display device comprising:

a display panel for displaying frames during an elapse of time; and

an emission driver for providing first and second emission power sources to the display panel,

wherein;

each of the frames comprises a light emitting period where a difference value between the first and second emission power sources is substantially equal to or greater than a reference value, and

the difference value between the first and second emission power sources changes over an elapse of time, during the light emitting period.

12. The display panel of claim 11, wherein the difference value between the first and second emission power sources decreases during the light emitting period.

13. The display panel of claim 12, wherein the difference value between the first and second emission power sources has a maximum value at a starting point of the light emitting period.

14. The display panel of claim 12, wherein:

each of the frames further comprises a light non-emitting period following the light emitting period, and

the difference value between the first and second emission power sources is less than the reference value during the light non-emitting period.

15. The display panel of claim 14, wherein:

each of the frames further comprises an additional light emitting period following the light non-emitting period, and

during the additional light emitting period, the difference value between the first and second emission power sources is equal to or greater than the reference value and increases over an elapse of time.

16. The display panel of claim 15, wherein the difference value between the first and second emission power sources has a maximum value at an end point of the additional light emitting period.

17. The display panel of claim 11, further comprising a timing controller for generating an emission control signal,

wherein the emission driver is configured to provide the first and second emission power sources to the display panel in response to the emission control signal.

18. A display device comprising:

a display panel comprising a plurality of pixels; and

an emission driver for providing an emission power source to the display panel,

wherein;

the display panel comprises first and second sections arranged in a first direction,

the display panel comprises a power providing line for providing the emission power source to the pixels and extended in the first direction, and

the power providing line comprises a first part in the first section, and a second part in the second section having a width different from a width of the first part.

19. The display device of claim 18, wherein the width of the first part is broader than the width of the second part.

20. The display device of claim 19, wherein:

the display panel further comprises a third section,

the second section is between the first and third sections, and

the power providing line is in the third section and comprises a third part having substantially the same width as the width of the first part.