A TDR touch screen and a touch scanning locating method

The invention provides a TDR touch screen comprising a touch area and a plurality of parallel U-shaped wires which are arranged in the touch area and are independent of one another. An insulation layer is arranged over the U-shaped wires. The TDR touch screen also comprises a signal transmitter, a reflection signal detector and a scanning drive circuit; the input ends of the U-shaped wires are connected with the signal transmitter and the reflection signal detector; the signal transmitter is connected with the scanning drive circuit. The invention also provides a touch scanning locating method suitable for the TDR touch screen. The method is characterized in that the scanning drive circuit drives the signal transmitter to transmit step signals to the input ends of the U-shaped wires successively and the reflection signal detector receives reflection signals of the input ends successively and correspondingly; touch positions are located based on the time delay from the input of the step signals to the reception of the reflection signals. According to the invention, multi-point touch control is realized, the touch control algorithm difficulty is reduced, and the touch control locating precision is improved.