Emission driver and organic light emitting display device having the same

Patent metadata

Field	Value
Publication number	US-2016379558-A1
Application number	US-201615007053-A
Country	US
Kind code	A1
Filing date	Jan 26, 2016
Priority date	Jun 29, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

An organic light emitting display device includes a display panel including a plurality of scan lines, a plurality of data lines, a plurality of emission lines, and a plurality of pixels, a scan driver configured to provide a scan signal to the pixels via the scan lines, a data driver configured to provide a data signal to the pixels via the data lines, an emission driver including a plurality of emission stages for providing an emission signal to the pixels via the emission lines, and a controller configured to control the scan driver, the data driver, and the emission driver, wherein each of the emission stages includes a plurality of sub-stages dependently connected to each other, and wherein one of the sub-stages is configured to output the emission signal to one of the emission lines.

First claim

What is claimed is:

1 . An organic light emitting display device comprising:
a display panel comprising a plurality of scan lines, a plurality of data lines, a plurality of emission lines, and a plurality of pixels; a scan driver configured to provide a scan signal to the pixels via the scan lines; a data driver configured to provide a data signal to the pixels via the data lines; an emission driver comprising a plurality of emission stages for providing an emission signal to the pixels via the emission lines; and a controller configured to control the scan driver, the data driver, and the emission driver, wherein each of the emission stages comprises a plurality of sub-stages dependently connected to each other, and wherein one of the sub-stages is configured to output the emission signal to one of the emission lines.

2 . The organic light emitting display device of claim 1 , wherein the controller is configured to provide a plurality of scan clock signals for controlling the scan driver to the scan driver, and to provide a plurality of emission clock signals for controlling the emission driver to the emission driver, and
wherein a period of the scan clock signals is longer than a period of the emission clock signals.

3 . The organic light emitting display device of claim 2 , wherein the sub-stages comprise:
first and second sub-stages each configured to provide an output signal, which is generated by shifting a corresponding input signal to be synchronized with a first emission clock signal or a second emission clock signal, to a next sub-stage, and wherein one of the first and second sub-stages is configured to output the output signal as the emission signal to one of the emission lines.

4 . The organic light emitting display device of claim 3 , wherein the second emission clock signal is substantially the same as the first emission clock signal shifted by a half period of the first emission clock signal.

5 . The organic light emitting display device of claim 3 , wherein each of the emission stages further comprises:
an output signal selector configured to select one of the output signal of the first sub-stage and the output signal of the second sub-stage as the emission signal.

6 . The organic light emitting display device of claim 3 , wherein the first sub-stage is located opposite to the second sub-stage with respect to an emission clock line via which the emission clock signal is configured to be provided.

7 . The organic light emitting display device of claim 2 , wherein the sub-stages comprise:
first to fourth sub-stages configured to provide an output signal, which is generated by shifting an input signal to be synchronized with a first emission clock signal or a second emission clock signal, to a corresponding next sub-stage, and wherein one of the first to fourth sub-stages is configured to output the output signal as the emission signal to one of the emission lines.

8 . The organic light emitting display device of claim 2 , wherein a period of the emission clock signal is determined by dividing a period of the scan clock signals by a number of the sub-stages in one of the emission stages.

9 . The organic light emitting display device of claim 1 , wherein the controller is configured to provide an emission start signal for driving the emission driver to the emission driver.

10 . The organic light emitting display device of claim 9 , wherein the controller is configured to control a length of an on-period of the emission start signal based on a dimming control value for controlling a dimming level.

11 . The organic light emitting display device of claim 10 , wherein the length of the on-period of the emission start signal is a multiple of a period of an emission clock signal for controlling the emission driver.

12 . The organic light emitting display device of claim 11 , wherein a length of the on-period of the emission start signal corresponds to a product of a length of one horizontal period and a number of the scan lines.

13 . The organic light emitting display device of claim 10 , wherein the dimming control value is configured to be changed based on an external light intensity.

14 . The organic light emitting display device of claim 10 , wherein the controller is configured to provide a hybrid dimming signal to the data driver based on the dimming control value, and
wherein the data driver is configured to select one among a plurality of gamma reference voltage sets based on the hybrid dimming signal to convert image data into the data signal.

15 . The organic light emitting display device of claim 1 , wherein the emission signal comprises at least one of an on-period and an off-period during one frame period.

16 . An emission driver comprising:
a plurality of emission stages configured to output an emission signal to a plurality of emission lines, wherein each of the emission stages comprises a plurality of sub-stages dependently connected to each other, and wherein one of the sub-stages is configured to output the emission signal to a corresponding one of the emission lines.

17 . The emission driver of claim 16 , wherein each of the sub-stages is configured to provide an output signal, which is generated by shifting an input signal to be synchronized with a first emission clock signal or a second emission clock signal, to a next sub-stage, and
wherein one of the sub-stages is configured to output the output signal as the emission signal to one of the emission lines.

18 . The emission driver of claim 17 , wherein the input signal is an emission start signal or an output signal of a previous sub-stage, and
wherein a length of an on-period of the emission start signal is configured to be adjusted based on a dimming control value for controlling a dimming level.

19 . The emission driver of claim 18 , wherein the length of the on-period of the emission start signal is a multiple of a period of the first emission clock signal.

20 . The emission driver of claim 17 , wherein a length of a period of the first emission clock signal and a length of a period of the second emission clock signal are substantially the same as a length of one horizontal period.

Assignees

• Samsung Display Co Ltd

Inventors

• Jeon Jin

Classifications

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G11C19/28

  using semiconductor elements (G11C19/14, G11C19/36 take precedence) · CPC title

• G11C19/184

  with field-effect transistors, e.g. MOS-FET · CPC title