Display panel having a node controller for discharging nodes in a scan driver and driving method thereof

A method of operating a display device, the method comprising:

• generating, at a timing controller, a control signal for a node controller configured to selectively couple and decouple a reference voltage node to a first gate electrode of a pull-up transistor of a scan driver stage, a second gate electrode of a pull-down transistor of the scan driver stage, and an output node of the scan driver stage, the generating comprising:
• during a first time period, configuring the control signal to decouple the reference voltage node from the first gate electrode, the second gate electrode, and the output node, and
• during a second time period after the first time period, configuring the control signal to couple the reference voltage node to the first gate electrode, the second gate electrode, and the output node,
• wherein the first time period comprises a scan period in which a scan pulse is supplied to each of the scan lines,
• wherein the second time period comprises:
• a blank time in which the scan pulse is not supplied between respective frame periods displaying the image on the display panel, and
• a power-off sequence of the display device, and
• wherein the blank time is varied according to an amount of motion in an input image data of the display device.

A display device, comprising:

• a shift register including a plurality of stages configured to shift and to output a scan pulse for a plurality of scan lines, each of the plurality of stages comprising:
• a pull-up transistor and a pull-down transistor coupled in series and defining an output node therebetween;
• a driver comprising:
• a first node coupled to a gate electrode of the pull-up transistor;
• and
• a second node coupled to a gate electrode of the pull-down transistor;
• and
• a node controller coupled to the first node, the second node, and the output node,
• wherein the pull-up transistor is configured to supply a high voltage at the output node in response to the driver supplying a turn-on voltage at the first node,
• wherein the pull-down transistor is configured to supply a low voltage at the output node in response to the driver supplying a turn-on voltage at the second node,
• wherein the node controller is configured to:
• decouple a reference voltage node to the first gate electrode, the second gate electrode, and the output node according to a control signal during the first time period, and
• couple the reference voltage node to the first gate electrode, the second gate electrode, and the output node according to the control signal during a second time period,
• wherein the first time period comprises a scan period in which the scan pulse is supplied to each of the scan lines,
• wherein the second time period comprises:
• a blank time in which the scan pulse is not supplied between respective frame periods displaying the image on the display panel, and
• a power-off sequence of the display device, and
• wherein the blank time is varied according to an amount of motion in an input image data of the display device.