GHOST RESOLUTION FOR A CAPACITIVE TOUCH PANEL
First Claim
1. A ghost resolution sensing method for a capacitive touch panel suffering a ghost phenomenon involving two points on the capacitive touch panel corresponding to a same coordinate in a first direction, the ghost resolution method comprising:
- (A) concurrently charging a trace in the first direction and a trace in a second direction at the first point;
(B) sensing a first capacitance value from the charged trace in the first direction or the charged trace in the second direction at the first point;
(C) concurrently charging a trace in the first direction and a trace in the second direction at the second point;
(D) sensing a second capacitance value from the charged trace in the first direction or the charged trace in the second direction at the second point; and
(E) recognizing a real point from the two points according to the first and second capacitance values.
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Accused Products
Abstract
Ghost resolution sensing methods are provided for capacitive touch panels. When ghost is detected involving two points on a capacitive touch panel, for each of the two points, the intersected traces at that one are concurrently charged to sense the capacitance value from either one of the intersected traces, and according thereto, a real point and a ghost point can be distinguished from each other. Alternatively, the intersected traces are crisscross driven by two synchronous and in phase signals or synchronous but out of phase signals, to sense the capacitance values at the two points. Preferably, intersectional calibration is performed in conjunction therewith, to recognize the real points.
88 Citations
23 Claims
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1. A ghost resolution sensing method for a capacitive touch panel suffering a ghost phenomenon involving two points on the capacitive touch panel corresponding to a same coordinate in a first direction, the ghost resolution method comprising:
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(A) concurrently charging a trace in the first direction and a trace in a second direction at the first point; (B) sensing a first capacitance value from the charged trace in the first direction or the charged trace in the second direction at the first point; (C) concurrently charging a trace in the first direction and a trace in the second direction at the second point; (D) sensing a second capacitance value from the charged trace in the first direction or the charged trace in the second direction at the second point; and (E) recognizing a real point from the two points according to the first and second capacitance values. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A ghost resolution sensing method for a capacitive touch panel suffering a ghost phenomenon involving two points on the capacitive touch panel corresponding to a same coordinate in a first direction, the ghost resolution method comprising:
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(A) concurrently charging a trace in the first direction and a trace in a second direction at the first point; (B) sensing a first capacitance value from the charged trace in the first direction and a second capacitance value from the charged trace in the second direction at the first point; (C) summing up the first and second capacitance values to obtain a first summed-up capacitance value; (D) concurrently charging a trace in the first direction and a trace in the second direction at the second point; (E) sensing a third capacitance value from the charged trace in the first direction and a fourth capacitance value from the charged trace in the second direction at the second point; (F) summing up the third and fourth capacitance values to obtain a second summed-up capacitance value; and (G) recognizing a real point from the two points according to the first and second summed-up capacitance values. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A ghost resolution sensing method for a capacitive touch panel suffering a ghost phenomenon involving two points on the capacitive touch panel corresponding to a same coordinate in a first direction, the ghost resolution method comprising:
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(A) concurrently charging a trace in the first direction and a trace in a second direction at the first point for the trace in the first direction at the first point to be sensed a first capacitance value therefrom; (B) charging the trace in the first direction at the first point while grounding the trace in the second direction at the first point for the trace in the first direction at the first point to be sensed a second capacitance value therefrom; (C) extracting a first differential capacitance value between the first and second capacitance values; (D) concurrently charging a trace in the first direction and a trace in a second direction at the second point for the trace in the first direction at the second point to be sensed a third capacitance value therefrom; (E) charging the trace in the first direction at the second point while grounding the trace in the second direction at the second point for the trace in the first direction at the second point to be sensed a fourth capacitance value therefrom; (F) extracting a second differential capacitance value between the third and fourth capacitance values; and (G) recognizing a real point from the two points according to the first and second differential capacitance values. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A ghost resolution sensing method for a capacitive touch panel suffering a ghost phenomenon involving two points on the capacitive touch panel corresponding to a same coordinate in a first direction, the ghost resolution method comprising:
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(A) concurrently driving a trace in the first direction at the first point with a first signal and a trace in a second direction at the first point with a second signal synchronous to the first signal; (B) sensing a first capacitance value from the driven trace in the first direction or the driven trace in the second direction at the first point; (C) concurrently driving a trace in the first direction at the second point with the first signal, and a trace in the second direction at the second point with the second signal; (D) sensing a second capacitance value from the driven trace in the first direction or the driven trace in the second direction at the second point; and (E) recognizing a real point from the two points according to the first and second capacitance values. - View Dependent Claims (20, 21, 22, 23)
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Specification