Touch display system and method for operating the same

A touch display system comprising:

• a cursor pen configured to provide a characteristic signal and for issuing a touch command by contacting a display panel at a specific location;
• the display panel including:
• a plurality of parallel data lines;
• a plurality of parallel gate lines disposed perpendicular to the plurality of data lines;
• and
• a plurality of pixels arranged in a matrix and disposed at intersections of the plurality of data lines and the plurality of gate lines, each pixel coupled to a corresponding data line among the plurality of data lines and a corresponding gate line among the plurality of gate lines;
• a gate driver configured to scan the plurality of the gate lines according to a clock signal for turning on pixel rows coupled to the plurality of gate lines;
• a source driver configured to output a plurality of first signals respectively to the plurality of data lines;
• and
• a positioning circuit including:
• a reading circuit configured to read a plurality of second signals respectively from the plurality of data lines after issuing the touch command;
• and
• a judging circuit configured to detect a disturbance signal associated with the characteristic signal in the plurality of second signals, and, when the disturbance signal is detected in a specific second signal read from a specific data line among the plurality of data lines, further configured determine a first coordinate of the specific location according to where the specific data line is disposed on the touch panel and determine a second coordinate of the specific location according to when the disturbance signal occurs in the specific second signal.

A position-detecting device for identifying a disturbance signal in a display device, comprising:

• a timing controller coupled to a plurality of gate lines in the display device and configured to sequentially scan pixels coupled to the plurality of the gate lines;
• a reading circuit coupled to a plurality of data lines in the display device for detecting the disturbance signal;
• and
• a judging circuit coupled to the reading circuit and the timing controller;
• wherein when the reading circuit detects the disturbance signal during a frame period of the display device, the judging circuit determines a first coordinate of the disturbance signal according to where a specific data line associated with the disturbance signal is disposed on the display device , identifies a specific gate line associated with when the disturbance signal occurs, and determines a second coordinate of the disturbance signal according to where the specific gate line is disposed on the display device.