Patent ID: 8890821

Claim:
A dual-differential sensing method for a touch sensitive display, comprising: providing said touch sensitive display, including: a first sensor providing a first value, including a first signal value and a first noise value, wherein said first noise value corresponds to a first distance between said first sensor and said touch sensitive display; a second sensor providing a second value, including a second signal value and a second noise value, wherein said second noise value corresponds to a second distance between said second sensor and said touch sensitive display; and a third sensor providing a third value, including a third signal value and a third noise value, wherein said third noise value corresponds to a third distance between said third sensor and said touch sensitive display, wherein said first value, said second value, and said third value are detected in one scan of said first sensor, said second sensor, and said third sensor; calculating a first difference value between said first value and said second value; calculating a second difference value between said second value and said third value; removing noise interference by calculating a dual difference value between said first difference value and said second difference value; and obtaining a sensing result based on a dual differential sensing information, and determining each location on said touch sensitive display touched or approached by at least one external object according to said sensing result, wherein said dual differential sensing information comprises said dual difference value.