Electronic device having touch sensor and method of driving the same
An electronic device having a touch sensor and a method of driving the same are disclosed. The electronic device includes a display panel having a touch screen, a touch driver configured to drive the touch screen, a timing controller configured to control the display panel and the touch driver, and a stylus pen configured to provide a signal to the touch screen. The timing controller, in order to synchronize with the stylus pen, generates and outputs a control signal having an extended vertical blanking period in which a vertical blanking period is extended, and a display driving period and a touch sensor driving period which alternate in two or more times for one frame.
1. An electronic device having a touch sensor, the electronic device comprising:
a display panel having a touch screen;
a touch driver configured to drive the touch screen;
a timing controller configured to control the display panel and the touch driver; and
a stylus pen configured to provide a signal to the touch screen,
wherein the timing controller, in order to synchronize with the stylus pen, is further configured to output a control signal having an extended vertical blanking period corresponding to a first pen signal output period of the stylus pen, a plurality of display driving periods, and a plurality of touch sensor driving periods, for one frame period,
wherein one display driving period and one touch sensor driving period alternate in two or more times, and
wherein a falling edge of the extended vertical blanking period occurs before a rising edge of the first pen signal output period of the stylus pen.
2. The electronic device of claim 1 , wherein a signal in the first pen signal output period of the stylus pen includes a beacon signal including frequency information and a synchronization signal of the stylus pen, and a digital signal including frequency information and phase information of the stylus pen.
3. The electronic device of claim 1 , wherein a rising edge period of the extended vertical blanking period is synchronized with a falling edge period of the first pen signal output period of the stylus pen.
4. The electronic device of claim 1 , wherein a rising edge period of the extended vertical blanking period occurs later than a falling edge period of the first pen signal output period of the stylus pen.
5. The electronic device of claim 1 , wherein a rising edge period of the extended vertical blanking period occurs before a falling edge period of the first pen signal output period of the stylus pen.
6. The electronic device of claim 1 , wherein the stylus pen further includes a second pen signal output period, and
the first pen signal output period and the second pen signal output period are separated with a predetermined delay time.
7. A method of driving an electronic device having a touch sensor including a display panel having a touch screen, a touch driver configured to drive the touch screen, a timing controller configured to control the display panel and the touch driver, and a stylus pen configured to provide a signal to the touch screen, the method comprising:
when the stylus pen is positioned on the touch screen and frame video data is input from outside, storing the frame video data in a frame memory, and outputting a control signal for synchronization with the stylus pen,
wherein the control signal has an extended vertical blanking period corresponding to a first pen signal output period of the stylus pen, a plurality of display driving periods, and a plurality of touch sensor driving periods, for one frame period,
wherein one display driving period and one touch sensor driving period alternate in two or more times, and
wherein a falling edge of the extended vertical blanking period occurs before a rising edge of the first pen signal output period of the stylus pen.
8. The method of claim 7 , wherein a signal in the first pen signal output period of the stylus pen includes a beacon signal including frequency information and a synchronization signal of the stylus pen, and a digital signal including frequency information and phase information of the stylus pen.
9. The method of claim 7 , wherein a rising edge period of the extended vertical blanking period is synchronized with a falling edge period of the first pen signal output period of the stylus pen.
10. The method of claim 7 , wherein a rising edge period of the extended vertical blanking period occurs later than a falling edge period of the first pen signal output period of the stylus pen.
11. The method of claim 7 , wherein a rising edge period of the extended vertical blanking period occurs before a falling edge period of the first pen signal output period of the stylus pen.