Detection method of active stylus

A method in a system including an active stylus and a display controller that detects the active stylus and that drives a display device, the method comprising:

• driving, by the display controller, the display device to display a first plurality of pixel data during a first display period in a first time period, wherein the display controller starts the driving of the display device to display the first plurality of pixel data a first amount of time after a beginning of the first time period, and the display controller ends the driving of the display device to display the first plurality of pixel data a second amount of time after the beginning of the first time period;
• driving, by the display controller, the display device to display a second plurality of pixel data during a second display period in second time period, wherein the display controller starts the driving of the display device to display the second plurality of pixel data a third amount of time after a beginning of the second time period, and the display controller ends the driving of the display device to display the second plurality of pixel data a fourth amount of time after the beginning of the second time period,
• wherein the first display period in the first time period and the second display period in the second time period have a same time length, and
• wherein the first amount of time is different from the third amount of time, and the second amount of time is different from the fourth amount of time;
• driving, by the display controller, the display device to display a third plurality of pixel data during a third display period of a third time period, wherein the display controller starts the driving of the display device to display the third plurality of pixel data a fifth amount of time after a beginning of the third second time period, and the display controller ends the driving of the display device to display the third plurality of pixel data a sixth amount of time after the beginning of the third time period, and
• wherein the first display period in the first time period, the second display period in the second time period, and the third display period in the third time period have the same time length, and
• wherein the first amount of time is different from the third amount of time and the fifth amount of time, and the second amount of time is different from the fourth amount of time and the sixth amount of time.

A method in a system including an active stylus and a display controller that detects the active stylus and that controls a display device, the method comprising:

• setting, by the display controller, a given time interval between a plurality of packet transmission periods;
• transmitting, by the display controller, a signal including a command for controlling operation of the active stylus, wherein the command includes timing information indicative of the plurality of packet transmission periods with the given time interval therebetween;
• driving, by the display controller, the display device to display pixel data;
• and
• changing, by the display controller, a start timing or an end timing of a display driving period during which the driving is performed, while the given time interval between the plurality of packet transmission periods is maintained.