SENSING METHOD USING SELF-CAPACITANCE AND MUTUAL-CAPACITANCE ALTERNATIVELY TO REDUCE TOUCH NOISES
First Claim
1. A sensing method using self-capacitance and mutual-capacitance alternatively to reduce touch noises in a capacitive multi-touch system including a capacitive touch panel, a first driving and sensing device, a second driving and sensing device, and a control device, wherein the first driving and sensing device and the second driving and sensing device respectively has a first work mode and a second work mode, and the first driving and sensing device and the second driving and sensing device perform a self-capacitance sensing at the first work mode and perform a mutual-capacitance sensing at the second work mode, the sensing method comprising the steps of:
- (A) initializing the first driving and sensing device and the second driving and sensing device by the control device;
(B) configuring the first driving and sensing device and the second driving and sensing device as the first work mode or the second work mode to perform the self-capacitance sensing or the mutual-capacitance sensing respectively on the capacitive touch panel for finding a first possible touch point range or a second possible touch point range;
(C) determining whether there is a range conjunction between the first possible touch point range and the second possible touch point range; and
(D) producing a possible touch point range conjunction when there is the range conjunction, and calculating coordinates of touch points based on the possible touch point range conjunction.
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Abstract
In a sensing method using self-capacitance and mutual-capacitance alternatively to reduce touch noises, a control device configures a first driving and sensing device and a second driving and sensing device to perform an initialization. The control device configures the first and second driving and sensing devices to perform at least one self-capacitance sensing for producing a first possible touch point range during a first work mode. Then, the control device configures the first and second driving and sensing devices to perform at least one mutual-capacitance sensing for producing a second possible touch point range during a second work mode. The control device determines if there is range conjunction between the first and second possible touch point ranges. The control device produces a possible touch point range conjunction and calculates coordinates of touch points based on the possible touch point range conjunction.
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Citations
12 Claims
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1. A sensing method using self-capacitance and mutual-capacitance alternatively to reduce touch noises in a capacitive multi-touch system including a capacitive touch panel, a first driving and sensing device, a second driving and sensing device, and a control device, wherein the first driving and sensing device and the second driving and sensing device respectively has a first work mode and a second work mode, and the first driving and sensing device and the second driving and sensing device perform a self-capacitance sensing at the first work mode and perform a mutual-capacitance sensing at the second work mode, the sensing method comprising the steps of:
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(A) initializing the first driving and sensing device and the second driving and sensing device by the control device; (B) configuring the first driving and sensing device and the second driving and sensing device as the first work mode or the second work mode to perform the self-capacitance sensing or the mutual-capacitance sensing respectively on the capacitive touch panel for finding a first possible touch point range or a second possible touch point range; (C) determining whether there is a range conjunction between the first possible touch point range and the second possible touch point range; and (D) producing a possible touch point range conjunction when there is the range conjunction, and calculating coordinates of touch points based on the possible touch point range conjunction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification