Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-9672767-B2
Application number	US-201414477479-A
Country	US
Kind code	B2
Filing date	Sep 4, 2014
Priority date	Mar 3, 2014
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

An organic light emitting display device includes: a display panel including a red sub-pixel, a green sub-pixel, a first blue sub-pixel, and a second blue sub-pixel connected to scan lines and data lines; a scan driver configured to drive the plurality of scan lines; a data driver configured to output a data output signal in response to a data signal; a de-multiplexer circuit configured to sequentially provide the data output signal to a first data line, a second data line, a third data line, and a fourth data line, respectively to the red sub-pixel, the green sub-pixel, the first blue sub-pixel, and the second blue sub-pixel, in response to selection signals; and a timing controller configured to provide the data signal to the data driver, control the scan driver, and output the selection signals in response to an image signal and a control signal.

First claim

What is claimed is:

1. An organic light emitting display device comprising:
a display panel comprising a red sub-pixel, a green sub-pixel, a first blue sub-pixel, and a second blue sub-pixel each connected to one of a plurality of scan lines and one of a plurality of data lines;
a scan driver configured to drive the plurality of scan lines;
a data driver configured to receive a data signal and output a data output signal to a output terminal in response to the data signal;
a de-multiplexer circuit configured to sequentially provide the data output signal to a first data line, a second data line, a third data line, and a fourth data line, respectively, to the red sub-pixel, the green sub-pixel, the first blue sub-pixel, and the second blue sub-pixel, in response to a red selection signal, a green selection signal, a blue selection signal, a first blue selection signal and a second blue selection signal; and
a timing controller configured to provide the data signal to the data driver, control the scan driver, and output the selection signals in response to an image signal and a control signal,
wherein the de-multiplexer circuit comprises:
a first transistor connected between the output terminal of the data driver and the first data line and having a gate electrode connected to the red selection signal;
a second transistor connected between the output terminal of the data driver and the second data line and having a gate electrode connected to the green selection signal;
a third transistor connected between the output terminal of the data driver and a blue line and having a gate electrode connected to the blue selection signal;
a fourth transistor connected between the blue line and the third data line and having a gate electrode connected to receive the first blue selection signal; and
a fifth transistor connected to the blue line and the fourth data line and having a gate electrode connected to the second blue selection signal,
wherein the timing controller simultaneously activates the blue selection signal and one of the first blue selection signal and the second blue selection signal.

2. The organic light emitting display device of claim 1 , wherein the timing controller is configured to output the first blue selection signal and the second blue selection signal in response to the image signal such that the data output signal is provided alternatively to the first blue sub-pixel and the second blue sub-pixel each frame.

3. The organic light emitting display device of claim 1 , wherein the timing controller is configured to output the first blue selection signal and the second blue selection signal in response to the image signal such that the data output signal is not provided to the first blue sub-pixel and the second blue sub-pixel during a predetermined frame.

4. The organic light emitting display device of claim 1 , wherein the timing controller is configured to output the first blue selection signal and the second blue selection signal in response to the image signal to operate in either a first blue mode, in which the data output signal is provided to the first blue sub-pixel, or a second blue mode, in which the data output signal is provided to the second blue sub-pixel.

5. The organic light emitting display device of claim 1 , wherein the de-multiplexer circuit further comprises:
a first buffer connected between the first transistor and the first data line;
a second buffer connected between the second transistor and the second data line; and
a third buffer connected between the third transistor and the blue line.

6. The organic light emitting display device of claim 1 , wherein the de-multiplexer circuit further comprises:
a fourth buffer connected between the fourth transistor and the third data line; and
a fifth buffer connected between the fifth transistor and the fourth data line.

7. The organic light emitting display device of claim 1 , wherein the de-multiplexer circuit further comprises:
a first buffer connected between the first transistor and the first data line;
a second buffer connected between the second transistor and the second data line;
a third buffer connected between the fourth transistor and the third data line; and
a fourth buffer connected between the fifth transistor and the fourth data line.

8. The organic light emitting display device of claim 1 , wherein the first blue sub-pixel and the second blue sub-pixel have different coordinate values in a color coordinator.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Il Nam

Classifications

• G09G3/2074 Primary

  using sub-pixels · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G3/3233

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

• G09G2300/0443

  with several sub-pixels for the same colour in a pixel, not specifically used to display gradations (G09G3/364 takes precedence) · CPC title