Scan driver and organic light emitting display device having the same

Patent metadata

Field	Value
Publication number	US-10096286-B2
Application number	US-201615369321-A
Country	US
Kind code	B2
Filing date	Dec 5, 2016
Priority date	Jan 19, 2016
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A scan driver includes a plurality of stages for respectively outputting a plurality of scan signals, an N-th stage of the stages including a shift register for outputting an N-th carry signal based on a frame start signal or based on a carry signal from a previous stage, and an output control block for outputting the N-th carry signal as an N-th scan signal in a display mode, and for repeatedly outputting active periods of the N-th scan signal during an active period of the N-th carry signal in a sensing mode, wherein N is a positive integer.

First claim

What is claimed is:

1. A scan driver comprising a plurality of stages for respectively outputting a plurality of scan signals, an N-th stage of the stages comprising:
a shift register for outputting an N-th carry signal based on a frame start signal or based on a carry signal from a previous stage; and
an output control block for outputting the N-th carry signal as an N-th scan signal in a display mode, and for repeatedly outputting active periods of the N-th scan signal during an active period of the N-th carry signal in a sensing mode,
wherein N is a positive integer.

2. The scan driver of claim 1 , wherein the output control block is for receiving a sensing clock signal and for determining a number of active periods of the N-th scan signal in the sensing mode based on an active period of the sensing clock signal and based on the active period of the N-th carry signal.

3. The scan driver of claim 2 , wherein a duration of the active period of the N-th scan signal is substantially the same as a duration of the active period of the sensing clock signal.

4. The scan driver of claim 3 , wherein the output control block is for generating the active period of the N-th scan signal that is synchronized with the active period of the sensing clock signal during the sensing mode.

5. The scan driver of claim 2 , wherein the output control block comprises:
a first switch for transmitting the sensing clock signal based on the N-th carry signal and comprising a gate electrode connected to a first node to receive the N-th carry signal;
a second switch connected between the first switch and an output terminal, and comprising a gate electrode for receiving a first sensing control signal; and
a third switch connected between the first node and the output terminal, and comprising a gate electrode for receiving a second sensing control signal.

6. The scan driver of claim 5 , wherein the first sensing control signal has an inactive level during the display mode, and
wherein the second sensing control signal has an active level during the display mode.

7. The scan driver of claim 5 , wherein the first sensing control signal has an active level during the sensing mode, and
wherein the second sensing control signal has an inactive level during the sensing mode.

8. The scan driver of claim 2 , wherein the output control block comprises:
a first switch for transmitting the sensing clock signal based on the N-th carry signal, and comprising a gate electrode for receiving the N-th carry signal;
a second switch connected between the first switch and an output terminal, and comprising a gate electrode for receiving a first sensing control signal;
a third switch connected between the output terminal and a first node where the N-th carry signal is output, and comprising a gate electrode for receiving a second sensing control signal; and
a fourth switch connected between the first node and the gate electrode of the first switch, and comprising a gate electrode for receiving the first sensing control signal.

9. The scan driver of claim 8 , wherein the first sensing control signal has an inactive level during the display mode, and
wherein the second sensing control signal has an active level during the display mode.

10. The scan driver of claim 8 , wherein the first sensing control signal has an active level during the sensing mode, and
wherein the second sensing control signal has an inactive level during the sensing mode.

11. An organic light emitting display device comprising:
a display panel comprising a plurality of pixels to be driven by a display mode and by a sensing mode;
a data driver for providing a data voltage corresponding to a display image to the display panel in the display mode, and for providing a sensing voltage to the display panel based on a data control signal in the sensing mode;
a scan driver for repeatedly generating and applying an active period of a scan signal to a scan line in the sensing mode;
a sensing driver for repeatedly generating and applying an active period of a sensing signal to a sensing line corresponding to the scan line in the sensing mode; and
a controller for performing a compensation with respect to the pixels based on sensing currents that are repeatedly generated at the pixels corresponding to the scan line in the sensing mode.

12. The device of claim 11 , wherein the controller is for calculating a compensation value of image data based on at least one of an average of the sensing currents, a maximum value of the sensing currents, and a minimum value of the sensing currents in the sensing mode.

13. The device of claim 11 , wherein the scan driver comprises a plurality of stages for respectively outputting a plurality of scan signals, an N-th stage of the stages comprising:
a shift register for outputting an N-th carry signal based on a frame start signal or based on a carry signal from a previous stage; and
an output control block for outputting the N-th carry signal as an N-th scan signal in the display mode, and for repeatedly outputting active periods of the N-th scan signal during an active period of the N-th carry signal in the sensing mode,
wherein N is a positive integer.

14. The device of claim 13 , wherein the output control block is for receiving a sensing clock signal during the sensing mode, and for determining a number of active periods of the N-th scan signal in the sensing mode based on an active period of the sensing clock signal and based the active period of the N-th carry signal.

15. The device of claim 14 , wherein a duration of the active period of the N-th scan signal is substantially the same as a duration of the active period of the sensing clock signal.

16. The device of claim 14 , wherein the output control block comprises:
a first switch for transmitting the sensing clock signal based on the N-th carry signal, and comprising a gate electrode connected to a first node for receiving the N-th carry signal;
a second switch connected between the first switch and an output terminal, and comprising a gate electrode for receiving a first sensing control signal; and
a third switch connected between the first node and the output terminal, and comprising a gate electrode for receiving a second sensing control signal.

17. The device of claim 11 , wherein the sensing driver comprises a plurality of stages for respectively outputting a plurality of sensing signals, an N-th stage of the stages comprising:
a shift register for outputting an N-th carry signal based on a frame start signal or based on a carry signal from a previous stage; and
an output control block for outputting the N-th carry signal as an N-th sensing signal in the display mode, and for repeatedly outputting active periods of the N-th sensing signal during an active period of the N-th carry signal in the sensing mode,
wherein N is a positive integer.

18. A scan driver comprising a plurality of stages for respectively outputting a plurality of scan signals, an N-th stage of the stages comprising:
a shift register for outputting an N-th carry signal based on a frame start signal or based on a carry signal from a previous stage;
an output control block for outputting the N-th carry signal as an N-th scan signal in a display mode, and for repeatedly outputting active periods of the N-th scan signal during an active period of the N-th carry signal in a sensing mode; and
a buffer block for controlling a rising time and a falling time of the N-th scan signal output from the output control block,
wherein N is a positive integer

Assignees

• Samsung Display Co Ltd

Inventors

• Cho Geun-Ho
• Park Yong-Sung

Classifications

• G09G2300/0842

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

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2310/067

  Special waveforms for scanning, where no circuit details of the gate driver are given · CPC title

• G09G3/3233

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

• G09G2320/0295

  by monitoring each display pixel · CPC title