Patent ID: 9024911
Filing Date: 2015-05-05
Classification: G06F

Abstract:
1. A detecting device for a capacitive touch screen, comprising: a storage circuit for storing a plurality of frequency settings based on power consumption of the capacitive touch screen, each frequency setting corresponding to one of a plurality of driving modes, and each frequency setting including a frequency and a set of parameters, wherein each driving mode corresponds to a driving potential with a working frequency; a driving circuit for providing a driving signal to at least one driving electrode of the capacitive touch screen according to the working frequency, wherein the capacitive touch screen includes a plurality of driving electrodes and a plurality of detecting electrodes crossing each other at a plurality of intersections; and a detecting circuit including: initializing settings of the detecting circuit based on the set of parameters of one of the frequency settings; detecting signals from the detecting electrodes based on a set of parameters of the detecting circuit and generating a 1D sensing information based on the signals from the detecting electrodes; determining if one, the sum, or the average of all the values of the 1D sensing information during noise detection exceeds a tolerable threshold; and if the tolerable threshold is exceeded, including: sequentially changing the working frequency and the settings of the detecting circuit based on the frequency and the set of parameters of one of the frequency settings and thereafter generating a 1D sensing information and determining if the tolerable threshold is still exceeded until the tolerable threshold is not exceeded; or sequentially changing the working frequency and the settings of the detecting circuit based on the frequency and the set of parameters of each of the frequency settings and thereafter generating a 1D sensing information and determining if the tolerable threshold is still exceeded, and changing the working frequency and the settings of the detecting circuit to the frequency and the set of parameters of the frequency setting that has the lowest noise interference.