Touch screen by percussion creates waves and receives waves to determine the typing position

 Touch screen by percussion creates waves and receives waves to determine the typing position.The screen is covered with a solid or liquid that is easy to wave when vibrating.Then 4 4-angle wave receivers measure the distance from the tap to 4 receivers . measured by the time multiplied by the speed of that wave like a radar. If you don't know the time to start the broadcast, then measure the difference between the 4 receivers to derive the typing coordinates.

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