Touch display using gate and data line as sensing lines

A touch display, comprising:

• a color filter substrate and an array substrate opposite to the color filter via a plurality of spacers;
• and
• a voltage detection circuit,
• wherein the color filter substrate comprises an upper substrate and a common electrode formed on the upper substrate, and the array substrate comprises a lower substrate and an array of pixels formed on the lower substrate, each of the pixels comprising a gate line, a data line, a thin film transistor, and a pixel electrode, and
• wherein the plurality of spacers comprise at least a first spacer formed between the gate line and the common electrode and a second spacer formed between the data line and the common electrode, and are formed on the common electrode on the color filter substrate and respectively abut against the gate line and data line on the array substrate after the color filter substrate and the array substrate are assembled together,
• the spacers are columnar spacers and formed by a material of resin or rubber that is mixed with conductive particles, become conductive and capable of electrically connecting the common electrode with the gate line and the data line respectively under an external pressure more than a threshold value, but become insulative under an external pressure less than the threshold value;
• the voltage detection circuit is connected with the gate line and the data line and configured to detect whether a voltage on the gate line and a voltage on the data line become equal to the voltage of the common electrode;
• upon the touch display being touched and the gate line and the data line at a touch point being electrically connected with the common electrode, the voltage on the gate line and the voltage on the data line become equal to a common voltage, the TFTs of the pixels corresponding to the gate line are turned on so that a bright line is displayed corresponding to the gate line, and the common voltage is applied to the pixels corresponding to the data line so that a bright line is displayed corresponding to the data line as well.