Patent ID: 9740339
Date: 2017-08-22
CPC Classifications: G06F,G09G

Claim:
1. A method of detecting an object using an ultrasonic sensor that includes an array of ultrasonic wave emitters and an array of ultrasonic wave detectors, the method comprising: causing the array of ultrasonic wave emitters to generate ultrasonic waves that are directed through a display TFT pixel array to the object, wherein the object is in contact with a protective platen and the display TFT pixel array resides between the protective platen and the array of ultrasonic wave emitters; detecting, with the array of ultrasonic wave detectors, ultrasonic waves that are reflected off of the object and back through the display TFT pixel array; producing, based on the detected ultrasonic waves, output signals corresponding to the detected ultrasonic waves; comparing, with a control system in communication with the ultrasonic sensor, the output signals from the ultrasonic sensor; and determining differences between output signals produced at different times based on the compared output signals.