Organic light emitting display and driving method of the same

Patent metadata

Field	Value
Publication number	US-2016155387-A1
Application number	US-201514680518-A
Country	US
Kind code	A1
Filing date	Apr 7, 2015
Priority date	Dec 2, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

An organic light emitting display includes a plurality of pixel row groups, a scan driver, a data driver, and a data distributor. Each pixel group includes the same number of pixel rows, and the pixel row groups are sequentially driven. The data distributor demultiplexes data signals for input into the pixels. The data signals are input to the pixels after threshold voltage compensation is performed at substantially a same time for pixels in each of the pixel row groups. Data signals are to be input to pixels in one pixel row group while threshold voltage compensation is performed for pixels in another pixel row group adjacent to the one pixel row group.

First claim

What is claimed is:

1 . An organic light emitting display, comprising:
a plurality of pixels, each pixel including: an organic light emitting diode; a first transistor having a gate electrode connected to a scan line, a first electrode connected to a data line, and a second electrode connected to a first node; a second transistor to drive the organic light emitting diode based on a data signal provided through the first transistor; a first capacitor connected between the first node and a second node connected to a gate electrode of the second transistor; a second capacitor connected between the first node and a first power supply voltage; a third transistor connecting the first power supply voltage with a third node connected to the other electrode of the second transistor; a fourth transistor connecting one electrode of the second transistor with a fourth node connected to an anode electrode of the organic light emitting diode; a fifth transistor having one electrode connected to the first node and the other electrode connected to the third node; a sixth transistor having one electrode connected to a fifth node to which an initialization voltage is applied and the other electrode connected to the fourth node; and a seventh transistor connecting the second node with the fifth node.

2 . The display as claimed in claim 1 , wherein a gate electrode of the fifth transistor, a gate electrode of the sixth transistor, and a gate electrode of the seventh transistor are connected to a same control signal line.

3 . The display as claimed in claim 1 , wherein:
the pixels are arranged in pixel row groups, and each pixel group includes a same number of pixel rows.

4 . The display as claimed in claim 3 , wherein the pixel row groups are to be sequentially driven.

5 . The display as claimed in claim 3 , wherein:
while data signals are input to pixels in one pixel row group, a threshold voltage is to be compensated in pixels in another pixel row group adjacent to the one pixel row group.

6 . The display as claimed in claim 3 , wherein threshold voltage compensation is to be performed at substantially a same time in each of the pixel row groups.

7 . The display as claimed in claim 1 , wherein the first capacitor is to be charged based on a voltage corresponding to a threshold voltage of the second transistor.

8 . The display as claimed in claim 1 , wherein a threshold voltage of the second transistor is to be compensated based on the initialization voltage provided through the seventh transistor.

9 . An organic light emitting display, comprising:
a plurality of pixels arranged in a plurality of pixel row groups, each pixel group including a same number of pixel rows; a scan driver to provide scan signals to the pixels; a data driver to generate data signals for the pixels; and a data distributor to demultiplex the data signals for input into the pixels, wherein the plurality of pixel row groups are sequentially driven, wherein data signals are to be input to the pixels after threshold voltage compensation is performed at substantially a same time for pixels in each of the pixel row groups, and wherein the data signals are to be input to pixels in one pixel row group while threshold voltage compensation is performed for pixels in another pixel row group adjacent to the one pixel row group.

10 . The display as claimed in claim 9 , wherein threshold voltage compensation is to be performed at substantially a same time for pixels in each of the pixel row groups.

11 . The display as claimed in claim 9 , wherein each of the pixels includes:
an organic light emitting diode, a first transistor to be turned on based on the scan signal to transmit the data signal provided through one electrode to another electrode, a second transistor to drive the organic light emitting diode based on a data signal provided through the first transistor, and a first capacitor connected between the other electrode of the first transistor and a gate electrode of the second transistor.

12 . The display as claimed in claim 11 , wherein the first capacitor is to be charged with a voltage corresponding to a threshold voltage of the second transistor during threshold voltage compensation.

13 . The display as claimed in claim 11 , wherein:
an initialization voltage is to be provided to the gate electrode of the second transistor before threshold voltage compensation, and a threshold voltage of the second transistor is to be compensated based on the initialization voltage.

14 . A method for driving an organic light emitting display, the method comprising:
applying an initialization voltage to pixels in one pixel row group; compensating a threshold voltage of a drive transistor of each of the pixels in one pixel row group; inputting a reference voltage to the pixels in one pixel row group; demultiplexing data signals and inputting the demultiplexed data signals to the pixels in one pixel row group; and controlling the pixels in one pixel row group to emit light, wherein the data signals are input to the pixels in one pixel row group while a threshold voltage is compensated in pixels in another pixel row group adjacent to the one pixel row group.

15 . The method as claimed in claim 14 , wherein the compensating includes:
compensating the threshold voltage of the pixels in each of the pixel row groups at substantially a same time.

16 . The method as claimed in claim 14 , further comprising:
applying a scan signal to turn on a first transistor to transmit the data signal provided through one electrode to another electrode of the first transistor, wherein a first capacitor is connected between the other electrode of the first transistor and a gate electrode of the drive transistor.

17 . The method as claimed in claim 16 , wherein the compensating includes:
charging the first capacitor based on a voltage corresponding to the threshold voltage of the drive transistor.

18 . The method as claimed in claim 16 , wherein each of the pixels includes a control transistor to connect the first transistor with the drive transistor.

19 . The method as claimed in claim 14 , wherein the data signal is demultiplexed by a demultiplexing signal output during a gate-on period of a scan signal.

20 . The method as claimed in claim 14 , wherein:
applying the initialization voltage includes charging a gate electrode of the drive transistor based on the initialization voltage, and the compensating includes compensating the threshold voltage of the drive transistor based on the initialization voltage.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Cheol Min
• Kang Hyung Ryul
• Chae Se Byung

Classifications

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2310/0297

  Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns · CPC title

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2310/0262

  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 title