Organic light emitting display and method of driving the same

Patent metadata

Field	Value
Publication number	US-8970458-B2
Application number	US-201113019151-A
Country	US
Kind code	B2
Filing date	Feb 1, 2011
Priority date	Jul 27, 2010
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

There is provided an organic light emitting display capable of minimizing noise. A method of driving the organic light emitting display includes setting pixels included in horizontal blocks into a non-emission state, the pixels charging voltages corresponding data signals, the pixels starting to emit light at different times in units of the horizontal blocks, and emitting light from the pixels according to the charging voltages.

First claim

What is claimed is:

1. A method of driving an organic light emitting display in which a panel is divided into at least 2 horizontal blocks of pixels that are driven during one frame, the method comprising:
setting the pixels at a non-emission state;
charging the pixels with voltages corresponding to data signals;
varying an emission start time of the pixels according to the respective horizontal blocks after all of the pixels in the panel have been charged with the voltages corresponding to the data signals during the one frame; and
emitting light from the pixels using the charged voltages, wherein the pixels start emitting light at different times according to the respective horizontal blocks.

2. The method as claimed in claim 1 , wherein, after the pixels in a first horizontal block of the horizontal blocks emit light, pixels comprising a second horizontal block of the horizontal blocks emit light.

3. The method as claimed in claim 2 , wherein, after the pixels comprising the first horizontal block stop emitting light, the pixels comprising the second horizontal block stop emitting emit light.

4. A method of driving an organic light emitting display, in which a panel is divided into at least 2 horizontal blocks that are driven during one frame, the horizontal blocks comprising a plurality of emission control lines and pixels, the pixels comprising control transistors that are configured to turn off when emission signals are supplied to the emission control lines to control emission times of the pixels and to turn on at other times, the method comprising:
supplying emission control signals to the emission control lines;
sequentially supplying scan signals to scan lines and selecting pixels in units of horizontal lines;
supplying data signals to the pixels selected by the scan signals; and
stopping the supply of the emission control signals in units of the horizontal blocks at different points in time after the scan signals have been supplied to all of the scan lines in the panel during the one frame.

5. The method as claimed in claim 4 , wherein, stopping the supply of the emission control signals in units of the horizontal blocks at different points in time comprises turning on the control transistors at different points in time.

6. The method as claimed in claim 4 , wherein the duration of each of the emission control signals supplied to the emission control lines is substantially the same.

7. The method as claimed in claim 4 , wherein, the pixels further comprise driving transistors, and before sequentially supplying the scan signals to the scan lines and selecting the pixels in units of horizontal lines, a period of compensating for threshold voltages of the driving transistors occurs.

8. An organic light emitting display comprising:
a scan driver for supplying scan signals to scan lines and for supplying emission control signals to emission control lines;
a data driver for supplying data signals to data lines in synchronization with the scan signals; and
a panel comprising emission control lines and at least 2 horizontal blocks that are driven during one frame and comprising pixels for charging voltages according to the data signals when the scan signals are supplied, and after the scan signals have been supplied to all of the scan lines in the panel during the one frame, for controlling an amount of current supplied to an organic light emitting diode (OLED) when the emission control signals are not supplied,
wherein the scan driver is configured to supply the emission control signals at different times to each of the at least 2 horizontal blocks.

9. The organic light emitting display as claimed in claim 8 , wherein the scan driver is configured to supply emission control signals to the emission control lines in a period where all of the pixels are charged with voltages according to the data signals.

10. The organic light emitting display as claimed in claim 9 , wherein the scan driver is configured to stop supplying the emission control signals at different times to different ones of the horizontal blocks, after the voltages corresponding to the data signals are charged in all of the pixels.

11. The organic light emitting display as claimed in claim 8 , wherein the scan driver is configured to supply emission control signals having a same duration to each of the emission control lines.

12. The organic light emitting display as claimed in claim 8 , wherein each of the pixels comprises:
an OLED;
a pixel circuit for controlling an amount of current supplied to the OLED; and
an emission control transistor coupled between the OLED and the pixel circuit, the emission control transistor being configured to turn off during a period when the emission control signals are supplied and to turn on in all other periods.

13. The organic light emitting display as claimed in claim 12 , further comprising:
a control line commonly coupled to the pixels; and
a control line driver for supplying a control signal to the control line.

14. The organic light emitting display as claimed in claim 13 , wherein the pixel circuit comprises:
a driving transistor for controlling an amount of current supplied to the OLED;
a first capacitor comprising a first terminal coupled at a second node to a gate electrode of the driving transistor;
a first transistor coupled between a second terminal of the first capacitor at a first node and a data line, and turned on when a corresponding one of the scan signals is supplied to a corresponding scan line of the scan lines;
a third transistor coupled between the second node and a second electrode of the driving transistor, and being configured to turn on when a control signal is supplied to the control line;
a fourth transistor coupled between the first node and a reference power source, and being configured to turn on when the control signal is supplied to the control line;
a second capacitor coupled between the first node and a first power source.

15. The organic light emitting display as claimed in claim 14 , wherein the control line driver is configured to supply the control signal to the control line before the scan signals are supplied to the scan lines.

16. The organic light emitting display as claimed in claim 14 , wherein the reference power source is set to a voltage level equal to or higher than a voltage level of the data signal.

Assignees

• Komiya Naoaki
• Lee Jang-Doo
• Samsung Display Co Ltd

Inventors

• Komiya Naoaki
• Lee Jang-Doo

Classifications

• G09G2300/0852

  being a dynamic memory with more than one capacitor · CPC title

• G09G2310/0218

  with collection of electrodes in groups for n-dimensional addressing · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0861

  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 title