Touch display device and touch sensing method
A touch display device and touch sensing technology, applied in the direction of instruments, electrical digital data processing, data processing input/output process, etc., can solve the problem of high production cost and surface acoustic wave touch screen can only sense soft Touch objects, APR touch screen can not achieve multi-touch and other problems, to achieve the effect of high light transmittance
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[0023] The touch sensing method of the present invention will be described below in conjunction with the first embodiment of the present invention.
[0024] First, a pulse signal is sent to the ultrasonic transducers 20 , and based on the pulse signal, each ultrasonic transducer 20 sequentially transmits and receives ultrasonic pulses in a certain order. Specifically, start an ultrasonic transducer 20 to send ultrasonic pulses in the first time period, receive ultrasonic pulses in the subsequent second time period, stop the ultrasonic transducer 20, and start the next ultrasonic transducer 20 in the second time period. The ultrasonic pulses are sent out in three time periods, and the ultrasonic pulses are received in the subsequent fourth time period, and all the ultrasonic transducers 20 are activated in sequence, so as to scan the touch-sensitive surface of the display panel 10 .
[0025] see figure 2 , during the emission period of each ultrasonic transducer 20 , the ultr...
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