Abstract: The three-dimensional touch system by acoustic waves comprises of a plurality of sensors and their controllers. The three-dimensional touch system implements the any or a combination of three different sensing methods. The first is an active wave triangulation location method that involves a plurality of receivers and an active wave transceiver. The second is a passive wave triangulation location method that involves a plurality of transceivers and a passive wave receiver. The last method, multi-triangulation location, uses different transceivers (or receivers) to input a multitude of different acoustic waves. Also, it is important that a calibration system be used to ensure that the transceivers and receivers are accurate in their readings.

Abstract: The present invention provides a single-layer capacitive touch panel for multi-point sensing. The capacitive touch panel includes a single patterned touch-sensing layer. When a touch occurs at a certain point on the capacitive touch panel, the generated coupling signal passes through the patterned touch-sensing layer along a determined path so that the coupling signal and thus the location of the certain touch point can be precisely detected. At least two touch points on the capacitive touch panel can be simultaneously detected by enforcing asynchronous scanning at four detecting points at four corners of the capacitive touch panel. Additionally, the single-layer capacitive touch panel can be partitioned into N blocks so as to accomplish the simultaneous sensing of 2×N touch points on the touch panel.