Touch system

摘要

In a touch system, a transmitter (TX) driving unit generates at least one pair of orthogonal drive signals, each pair having a specific frequency. At least one pair of TX electrode lines is simultaneously driven by the at least one pair of orthogonal drive signals, respectively. A sense signal is induced on a receiver (RX) electrode line by capacitances disposed between the TX electrode lines and the RX electrode line. An RX detection unit detects the sense signal to simultaneously result in two sense components that respectively estimate the capacitances associated with the TX electrode lines of the pair.

主权项

1. A touch system, comprising:
a transmitter (TX) driving unit configured to generate at least one pair of orthogonal drive signals, each pair having a specific frequency; at least one pair of TX electrode lines simultaneously driven by the at least one pair of orthogonal drive signals, respectively; a receiver (RX) electrode line on which a sense signal is induced by capacitances disposed between the TX electrode lines and the RX electrode line; and an RX detection unit configured to detect the sense signal to simultaneously result in two sense components that respectively estimate the capacitances associated with the TX electrode lines of the pair; wherein the RX detection unit further comprises a window function unit configured to perform a window function on the sense signal, the window function comprising a partial window having a center part, a rising part and a falling part, wherein the center part has a constant value, a value of the rising part is increasing, and a value of the falling part is decreasing, the rising part and the falling part being complementary; wherein after the partial window is performed on the sense signal, a windowed rising part is resulted from the rising part, and a windowed falling part is resulted from the falling part, and subsequently the windowed falling part is moved overlapped and added to the windowed rising part, thereby resulting in a reconstructed sense signal.