Patent ID: 7385593

Claim:
A method of operating a touch-screen display system that includes a first resistive screen extending between a first bus bar and a second bus bar, and a second resistive screen extending between a third bus bar and a fourth bus bar, wherein the first resistive screen overlaps the second resistive screen to define an active area of the touch-screen display, the method comprising: during a first period and during a second period, touching the first resistive screen to the second resistive screen in the active area of the touch-screen display, wherein the first period and the second period are two distinct periods; during the first period, applying a first voltage reference signal to the first bus bar; during the first period, creating a first ground reference at the second bus bar such that the first voltage signal and the first ground reference creates a first varying voltage potential across the first resistive screen during the first period; during the first period, sampling the first varying voltage potential via at least one of the third bus bar and the fourth bus bar; determining an Xraw value based upon sampling the first varying voltage potential; during the second period, applying a second voltage reference signal to the third bus bar; during the second period, creating a second ground reference at the fourth bus bar such that the second voltage signal and the second ground reference creates a second varying voltage potential across the second resistive screen daring the second period; during the second period, sampling the second varying voltage potential via at least one of the first bus bar and the second bus bar; and determining a Yraw value based upon sampling the second varying voltage potential.