Patent ID: 8952928
Filing Date: 2015-02-10
Classification: G06F

Abstract:
1. A method for operating a touch screen, wherein said touch screen comprising a plurality of first conductive strips arranged parallel in a first direction and a plurality of second conductive strips arranged parallel in a second direction, and at least one external grounded conductive object on said touch screen is detected based on a reference value, said method comprising: (a) performing a one-dimensional (1D) mutual capacitive detection to obtain a first 1D sensing information within a predetermined period of time, wherein said 1D mutual capacitive detection including: (b) performing a two-dimensional (2D) mutual capacitive detection to obtain a 2D sensing information, said 2D mutual capacitive detection including: (c) determining a location of the said at least one external grounded conductive object based on said 2D sensing information when said first 1D sensing information indicates that there is the at least one external grounded touching or approaching said touch screen; (d) updating said reference values based on said 2D sensing information when said first 1D sensing information indicates that there is no at least one external grounded conductive object touching or approaching said touch screen.