ORGANIC LIGHT EMITTING DISPLAY AND DRIVING METHOD THEREOF

• US 20160019844A1
• Filed: 05/08/2015
• Published: 01/21/2016
• Est. Priority Date: 07/18/2014
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Yang, Jin-Wook
• Granted Patent: US 9,978,307 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An organic light emitting display includes: a first pixel; and a second pixel adjacent to the first pixel, the second pixel being configured to emit light at a different time from the first pixel, wherein the first pixel and the second pixel share a storage capacitor configured to store a voltage of a data signal.

Claims

1. An organic light emitting display comprising:

a first pixel; and

a second pixel adjacent to the first pixel, the second pixel being configured to emit light at a different time from the first pixel,

wherein the first pixel and the second pixel share a storage capacitor configured to store a voltage of a data signal.

2. The organic light emitting display of claim 1, wherein the first pixel and the second pixel are configured to emit light alternatively with respect to a frame.

3. The organic light emitting display of claim 1, further comprising:

a scan driver configured to supply a first scan signal to a first scan line coupled to the first pixel and the second pixel, and to supply a second scan signal to a second scan line coupled to the first pixel and the second pixel;

an emission driver configured to supply a first light emitting control signal to a first light emitting control line coupled to the first pixel and the second pixel, and to supply a second light emitting control signal to a second light emitting control line coupled to the first pixel and the second pixel; and

a data driver configured to supply the data signal to a data line coupled to the first pixel and the second pixel.

4. The organic light emitting display of claim 3, wherein the scan driver is configured to supply the first scan signal to the first scan line during an i-th frame period, where i is an odd or even number, and to supply the second scan signal to the second scan line during an (i+1)-th frame period.

5. The organic light emitting display of claim 4, wherein the emission driver is configured to supply the first light emitting control signal to the first light emitting control line after the first scan signal is supplied, and to supply the second light emitting control signal to the second light emitting control line after the second scan signal is supplied.

6. The organic light emitting display of claim 4, wherein the data driver is configured to supply the data signal corresponding to the first pixel to the data line when the first scan signal is supplied, and to supply the data signal corresponding to the second pixel to the data line when the second scan signal is supplied.

7. The organic light emitting display of claim 3,

wherein the first pixel comprises:

a first organic light emitting diode; and

a first driving transistor configured to control an amount of current flowing from a first power source to a second power source via the first organic light emitting diode corresponding to a voltage applied to a first node, and

wherein the second pixel comprises;

a second organic light emitting diode; and

a second driving transistor configured to control an amount of current flowing from the first power source to the second power source via the second organic light emitting diode corresponding to a voltage applied to a second node.

8. The organic light emitting display of claim 7, wherein the storage capacitor is coupled between the first node and the second node.

9. The organic light emitting display of claim 7, wherein the first pixel further comprises:

a first transistor coupled between an anode electrode of the first organic light emitting diode and an initialization power source set to a voltage lower than that of the second power source, the first transistor being configured to be turned on when the second light emitting control signal is supplied;

a second transistor coupled between the data line and the first node, and configured to be turned on when the first scan signal is supplied;

a third transistor coupled between the first power source and the first node, and configured to be turned on when the second light emitting control signal is supplied;

a fourth transistor coupled between the first driving transistor and the anode electrode of the first light emitting diode, and configured to be turned on when the first light emitting control signal is supplied; and

a fifth transistor coupled between a reference power source set to a voltage higher than that of the first power source and the first node, the fifth transistor being configured to be turned on when the second scan signal is supplied.

10. The organic light emitting display of claim 7, wherein the second pixel further comprises:

a first transistor coupled between an anode electrode of the second organic light emitting diode and an initialization power source set to a voltage lower than that of the second power source, the first transistor being configured to be turned on when the first light emitting control signal is supplied;

a second transistor coupled between the data line and the second node, and configured to be turned on when the second scan signal is supplied;

a third transistor coupled between the first power source and the second node, and configured to be turned on when the first light emitting control signal is supplied;

a fourth transistor coupled between the second driving transistor and the anode electrode of the second organic light emitting diode, and configured to be turned on when the second light emitting control signal is supplied; and

a fifth transistor coupled between a reference power source set to a voltage equal to or higher than that of the first power source and the second node, the fifth transistor being configured to be turned on when the first scan signal is supplied.

11. The organic light emitting display of claim 1, further comprising:

a scan driver configured to supply a first scan signal to a first scan line coupled to the first pixel and the second pixel, and to supply a second scan signal to a second scan line coupled to the first pixel and the second pixel;

an emission driver configured to supply a first emitting control signal to a first light emitting control line coupled to the first pixel and the second pixel, and to supply a second light emitting control signal to a second light emitting control line coupled to the first pixel and the second pixel; and

a data driver configured to supply a first data signal to a first data line coupled to the first pixel, and to supply a second data signal to a second data line coupled to the second pixel.

12. The organic light emitting display of claim 11, wherein the scan driver is configured to supply the first scan signal to the first scan line during an i-th frame period and an (i+1)-th frame period, where i is an odd or even number, and to supply the second scan signal to the second scan line so that the second scan signal is synchronized with the first scan signal.

13. The organic light emitting display of claim 12, wherein the emission driver is configured to supply the first light emitting control signal to the first light emitting control line after the first scan signal is supplied during the i-th frame period, and to supply the second light emitting control signal to the second light emitting control line after the second scan signal is supplied during the (i+1)-th frame period.

14. The organic light emitting display of claim 12, wherein:

the data driver is configured to supply, during the i-th frame period, the first data signal, corresponding to a desired brightness, to the first data line, and the second data signal, corresponding to a black gray level, to the second data line; and

the data driver is configured to supply, during the (i+1)-th frame period, the first data signal, corresponding to the black gray level, to the first data line, and the second data signal, corresponding to the desired brightness, to the second data line.

15. The organic light emitting display of claim 11,

wherein the first pixel comprises:

a first organic light emitting diode; and

a first driving transistor configured to control an amount of current flowing from a first power source to a second power source via the first organic light emitting diode corresponding to a voltage applied to a first node, and

wherein the second pixel comprises;

a second organic light emitting diode; and

a second driving transistor configured to control an amount of current flowing from the first power source to the second power source via the second organic light emitting diode corresponding to a voltage applied to a second node.

16. The organic light emitting display of claim 15, wherein the storage capacitor is coupled between the first node and the second node.

17. The organic light emitting display of claim 15, wherein the first pixel further comprises:

a first transistor coupled between an anode electrode of the first organic light emitting diode and an initialization power source set to a voltage lower than that of the second power source, the first transistor being configured to be turned on when the second organic light emitting control signal is supplied;

a second transistor coupled between the first data line and the first node, and configured to be turned on when the first scan signal is supplied;

a third transistor coupled between the first power source and the first node, and configured to be turned on when the second light emitting control signal is supplied; and

a fourth transistor coupled between the first driving transistor and the anode electrode of the first organic light emitting diode, and configured to be turned on when the first light emitting control signal is supplied.

18. The organic light emitting display of claim 15, wherein the second pixel further comprises:

a first transistor coupled between an anode electrode of the second organic light emitting diode and an initialization power source set to a voltage lower than that of the second power source, the first transistor being configured to be turned on when the first organic light emitting control signal is supplied;

a second transistor coupled between the second data line and the second node, and configured to be turned on when the second scan signal is supplied;

a third transistor coupled between the first power source and the second node, and configured to be turned on when the first light emitting control signal is supplied; and

a fourth transistor coupled between the second driving transistor and the anode electrode of the second organic light emitting diode, and configured to be turned on when the second light emitting control signal is supplied.

19. A method of driving an organic light emitting display, the method comprising:

emitting light from a first pixel during an i-th frame period, where i is an odd or even number; and

emitting light from a second pixel, sharing a storage capacitor with the first pixel, during an (i+1)-th frame period.

20. The method of claim 19, wherein a light emitting time of the first pixel and a light emitting time of the second pixel do not overlap each other.