Organic light emitting display and driving method of the same

Patent metadata

Field	Value
Publication number	US-2016155379-A1
Application number	US-201514685470-A
Country	US
Kind code	A1
Filing date	Apr 13, 2015
Priority date	Dec 2, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

An organic light-emitting display device includes: a plurality of pixels arranged in a matrix, wherein each of the pixels includes: an organic light emitting element; a first transistor including a gate electrode coupled to a scan line, a first electrode coupled to a data line, and a second electrode coupled to a first node, a second transistor configured to drive the organic light emitting element according to a data voltage provided through the first transistor; a third transistor including a first electrode coupled to the first node and a second electrode coupled to a second node; a first capacitor between the first node and a third node configured to have an initialization voltage applied; and a second capacitor between a fourth node coupled to a gate electrode of the second transistor and the second node.

First claim

What is claimed is:

1 . An organic light emitting display comprising:
a plurality of pixels arranged in a matrix, wherein each of the pixels comprises:
an organic light emitting element;
a first transistor comprising a gate electrode coupled to a scan line, a first electrode coupled to a data line, and a second electrode coupled to a first node,
a second transistor configured to drive the organic light emitting element according to a data voltage provided through the first transistor;
a third transistor comprising a first electrode coupled to the first node and a second electrode coupled to a second node;
a first capacitor between the first node and a third node configured to have an initialization voltage applied;
a second capacitor between a fourth node coupled to a gate electrode of the second transistor and the second node;
a fourth transistor comprising a first electrode coupled to the second node and a second electrode coupled to a fifth node coupled to the second electrode of the second transistor;
a fifth transistor comprising a first electrode coupled to the fourth node and a second electrode coupled to a sixth node coupled to an electrode of the second transistor;
a sixth transistor comprising a first electrode coupled to the third node and a second electrode coupled to an anode electrode of the organic light emitting element; and
a seventh transistor comprising a first electrode coupled to the sixth node and a second electrode coupled to the anode electrode of the organic light emitting element.

2 . The organic light emitting display of claim 1 , wherein gate electrodes of the fourth transistor, the fifth transistor, and the sixth transistor are coupled to a same control signal line.

3 . The organic light emitting display of claim 1 , wherein gate electrodes of the fourth transistor, the fifth transistor, and the sixth transistor are coupled to different control signal lines.

4 . The organic light emitting display of claim 1 , wherein gate electrodes of the fourth transistor, the fifth transistor, and the sixth transistor are coupled to a first control signal line, and
a gate electrode of the third transistor is coupled to a second control signal line different from the first control signal line.

5 . The organic light emitting display of claim 1 , wherein the plurality of pixels are arranged in a plurality of pixel row groups comprising pixel rows of a same number, and
the third transistor of the pixels of a first pixel row group of the pixel row groups is coupled with a scan line coupled with a second pixel row group of the pixel row groups adjacent the first pixel row group.

6 . The organic light emitting display of claim 5 , wherein each of the pixel row groups comprises 8 pixel rows, and
the gate electrode of the third transistor of pixels included in a pixel row group of the pixel row groups including k to k+7-th scan lines is coupled with a k+12-th scan line, wherein k is a natural number greater than 1.

7 . The organic light emitting display of claim 5 , wherein the organic light emitting display is configured to simultaneously compensate for a threshold voltage in the pixels included in the plurality of pixel row groups.

8 . The organic light emitting display of claim 5 , wherein the organic light emitting display is configured to sequentially apply a scan signal to the plurality of pixel row groups.

9 . An organic light emitting display comprising:
a plurality of pixels arranged in matrix comprising a plurality of pixel row groups including pixel rows of a same number; a scan driver configured to sequentially apply a scan signal to the plurality of pixels; a data driver configured to generate a data signal provided to the plurality of pixels; and a data distributing unit configured to demultiplex the data signal and to transfer the demuliplexed data signal to the plurality of pixels, wherein the organic light emitting display is configured to simultaneously compensate for a threshold voltage of the pixels included in each pixel row group, which are configured to charge the data signal applied before the compensation of the threshold voltage in a first capacitor, and the organic light emitting display is configured to transfer the data signal charged in the first capacitor to a gate terminal of a driving transistor after the compensation of the threshold voltage.

10 . The organic light emitting display of claim 9 , wherein the pixels in the each pixel row group further comprise control transistors that control coupling of the first capacitor and the gate terminal of the driving transistor.

11 . The organic light emitting display of claim 10 , further comprising:
a second capacitor coupled between the control transistor and the gate terminal of the driving transistor.

12 . The organic light emitting display of claim 10 , wherein a gate electrode of each control transistor of the pixels of a first pixel row group is coupled with a scan line coupled with a second pixel row group adjacent the first pixel row group.

13 . The organic light emitting display of claim 12 , wherein the each pixel row group comprises 8 pixel rows, and a gate electrode of each control transistor of pixels of a pixel row group including k to k+7-th scan lines is coupled with a k+12-th scan line, wherein k is a natural number greater than 1.

14 . A driving method of an organic light emitting display, the organic light emitting display comprising a plurality of pixels arranged in matrix comprising a plurality of pixel row groups including pixel rows of a same number to be driven for each pixel row group and each pixel comprises an organic light emitting element and a driving transistor driving the organic light emitting element, the method comprising:
demulplexing and inputting a data signal in pixels of a first pixel row group; providing an initialization voltage to the pixels of the first pixel row group; compensating a threshold voltage of driving transistors of the pixels of the first pixel row group; transferring the data signal to gate terminals of the driving transistors; and emitting an organic light emitting element in response to the data signal.

15 . The method of claim 14 , wherein a second pixel row group adjacent the first pixel row group sequentially receives the data signal from the first pixel row group.

16 . The method of claim 14 , further comprising simultaneously compensating the threshold voltage of the driving transistors of the pixels included in the first pixel row group.

17 . The method of claim 14 , wherein the each pixel further comprises a first capacitor configured to be charged with the data signal and a control transistor controlling connection of the first capacitor and the gate terminal of the driving transistor.

18 . The method of claim 17 , wherein the organic light emitting display further comprises a second capacitor coupled between the control transistor and the gate terminal of the driving transistor.

19 . The method of claim 17 , wherein a gate electrode of each of the control transistors of pixels of the first pixel row group is coupled to a scan line coupled to a second pixel row group adjacent the first pixel row group.

20 . The method of claim 17 , wherein the each pixel row group comprises 8 pixel rows, and a gate electrode of control transistors of pixels included in a pixel row group including k to k+7-th scan lines is coupled to a k+12-th scan line, wherein k is a natural number greater than 1.

Assignees

• Samsung Display Co Ltd

Inventors

• Na Ji Su

Classifications

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G2310/0218

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

• G09G2300/0819

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