Patent ID: 9304633
Filing Date: 2016-04-05
CPC Classification: G06F

Claim Text:
1. A method for detecting a touch screen comprising: providing the touch screen including a plurality of first conductive strips, a plurality of second conductive strips, and a plurality of guarding conductive strips, wherein the first conductive strips, the second conductive strips and the guarding conductive strips are exposed and separated from each other; simultaneously providing a driving signal to all guarding conductive strips while all first conductive strips are simultaneously provided with the driving signal so as to perform a full screen driven detection including: when all of the first conductive strips and all of the guarding conductive strips are provided with the driving signal, detecting mutual capacitive signals of all of the second conductive strips to generate a one-dimensional (1D) sensing information based on the signals of all of the second conductive strips; and determining whether at least one external conductive object coupled to ground is touching or approaching the touch screen based on the 1D sensing information; and when determining the touch screen is not touched or approached by any external conductive object over a predetermined period of time based on the 1D sensing information, all guarding conductive strips are simultaneously provided with a DC potential while one or more different first conductive strips are sequentially provided with a driving signal so as to perform a 2D mutual capacitive detection to obtain a 2D sensing information, and updating reference values based on the 2D sensing information, wherein the 2D mutual capacitive detection includes: each time one or more different conductive strips in the first conductive strips being provided with the driving signal, detecting the signals of all of the second conductive strips to obtain a 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal generated based on the mutual capacitive signals of all of the second conductive strips; and combining each 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal to generate a 2D sensing information.