Organic light emitting display including demultiplexer and driving method thereof

Patent metadata

Field	Value
Publication number	US-9805647-B2
Application number	US-201314066649-A
Country	US
Kind code	B2
Filing date	Oct 29, 2013
Priority date	Jun 26, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

An organic light emitting display includes first sub-pixels, second sub-pixels and third sub-pixels at an area defined by scan lines and data lines; a data driver configured to supply an initialization voltage and data signals to output lines; demultiplexers coupled to respective ones of the output lines, each demultiplexer being configured to supply a plurality of the data signals to a plurality of the data lines; and a demultiplexer controller configured to control the demultiplexer so that data signals are concurrently supplied to at least one of the first sub-pixels, the second sub-pixels or the third sub-pixels.

First claim

What is claimed is:

1. An organic light emitting display comprising:
a plurality of pixels comprising first sub-pixels, second sub-pixels and third sub-pixels at an area defined by scan lines and data lines;
a data driver configured to supply an initialization voltage and data signals to output lines;
demultiplexers coupled to respective ones of the output lines, each demultiplexer being configured to supply a plurality of the data signals to a plurality of the data lines; and
a demultiplexer controller configured to control the demultiplexers so that the data signals are concurrently supplied to at least one of the first sub-pixels, the second sub-pixels or the third sub-pixels of the plurality of pixels,
wherein each of the demultiplexers comprises a first switch and a second switch,
wherein each of the first and second switches is a single transistor,
wherein the first switch coupled to an i-th (i is only 1, 4, 7, . . . ) output line is turned on when a first control signal is supplied from the demultiplexer controller, and the second switch coupled to the i-th output line is turned on when a second control signal is supplied from the demultiplexer controller, and
wherein the first switch coupled to (i+1)-th and (i+2)-th output lines is turned on when the second control signal is supplied from the demultiplexer controller such that the data signals supplied to the (i+1)-th and (i+2)-th output lines are supplied to data lines corresponding to the first switches while the first switches are turned on, and the second switch coupled to the (i+1)-th and (i+2)-th output lines is turned on when the first control signal is supplied from the demultiplexer controller such that the data signals applied to the (i+1)-th and (i+2)-th output lines are supplied to data lines corresponding to the second switches while the second switches are turned on.

2. The organic light emitting display of claim 1 , wherein the demultiplexer controller is configured to control the demultiplexer so that the initialization voltage is supplied to the data lines during a first period in a horizontal period, one of the data signals is supplied to the first sub-pixels during a second period in the horizontal period, and another one of the data signals is supplied to the second sub-pixels during a third period in the horizontal period.

3. The organic light emitting display of claim 2 , wherein the first sub-pixels are green sub-pixels configured to generate green light.

4. The organic light emitting display of claim 2 , wherein the second sub-pixels are red sub-pixels configured to generate red light.

5. The organic light emitting display of claim 2 , wherein one of the data signals supplied to the third sub-pixels is supplied during the second and third periods.

6. The organic light emitting display of claim 2 , further comprising a timing controller configured to rearrange external data, corresponding to an order of the data signals supplied to the first sub-pixels, the second sub-pixels and the third sub-pixels, and configured to supply the rearranged data to the data driver.

7. The organic light emitting display of claim 2 , wherein the demultiplexer controller is configured to supply the first and second control signals during the first period, supply the second control signal during the second period, and supply the first control signal during the third period.

8. The organic light emitting display of claim 2 , wherein the first switch is coupled to one of the data lines at one side of the demultiplexer, and
wherein the second switch is coupled to one of the data lines at an other side of the demultiplexer.

9. The organic light emitting display of claim 1 , wherein the initialization voltage is a voltage lower than a voltage of the data signals.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Yang-Wan

Classifications

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · 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

• G09G3/3233 Primary

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

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · 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