ORGANIC LIGHT EMITTING DISPLAY DEVICE

• US 20150248855A1
• Filed: 09/04/2014
• Published: 09/03/2015
• Est. Priority Date: 03/03/2014
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: KIM, Il Nam
• Granted Patent: US 9,672,767 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0297 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 Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

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.

Claims

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 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.

2. The organic light emitting display device of claim 1, wherein the selection signals comprise a first blue selection signal and a second blue selection signal, and

wherein the de-multiplexer circuit is configured to selectively provide the data output signal to the first blue sub-pixel and the second blue sub-pixel in response to the first blue selection signal and the second blue selection signal.

3. The organic light emitting display device of claim 2, 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.

4. The organic light emitting display device of claim 2, 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.

5. The organic light emitting display device of claim 2, 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.

6. The organic light emitting display device of claim 2, wherein the selection signals further comprise a red selection signal, a green selection signal, and a blue selection signal, and

wherein the de-multiplexer circuit comprises:

a first selection circuit configured to output the data output signal to one of a first data line connected to the red sub-pixel, a second data line connected to the green sub-pixel, and a blue line, in response to the red selection signal, the green selection signal, and the blue selection signal; and

a second selection circuit configured to output the data output signal from the blue line to one of a third data line connected to the first blue sub-pixel, and a fourth data line connected to the second blue sub-pixel, in response to the first blue selection signal and the second blue selection signal.

7. The organic light emitting display device of claim 6, wherein the first selection circuit comprises:

a first transistor connected between the data output signal and the first data line and having a gate electrode connected to the red selection signal;

a second transistor connected between the data output signal and the second data line and having a gate electrode connected to the green selection signal; and

a third transistor connected between the data output signal and the blue line and having a gate electrode connected to the blue selection signal.

8. The organic light emitting display device of claim 7, wherein the first selection 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.

9. The organic light emitting display device of claim 6, wherein the second selection circuit comprises:

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.

10. The organic light emitting display device of claim 9, wherein the second selection 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.

11. The organic light emitting display device of claim 9, 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.

12. 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.