SENSING METHDO AND CALIBRATION METHOD FOR A CAPACITIVE TOUCH PANEL
First Claim
35. A sensing method for a capacitive touch panel having a plurality of first traces in a first direction and a plurality of second traces in a second direction, the sensing method comprising the steps of:
- defining a plurality of stimulus regions based on the first traces and the second traces;
providing a first signal for sensing the first traces and a second signal for stimulating the second traces;
obtaining and storing calibration parameters for the first traces;
deriving ADC values of the stimulus regions using the calibration parameters; and
storing the ADC values of the stimulus regions for multi-finger calculation to locate real points.
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Abstract
Stimulus regions are defined based on the traces of a capacitive touch panel. A first signal is applied to a first trace in a first direction under a second signal applied to a second trace in a second direction to stimulate the second trace, to sense a stimulus region for an ADC value thereof. Calibration parameters for the traces are determined according to the ADC values of the traces without being touched, and are stored for later sensing the traces for position calculation and multi-finger calculation.
24 Citations
95 Claims
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35. A sensing method for a capacitive touch panel having a plurality of first traces in a first direction and a plurality of second traces in a second direction, the sensing method comprising the steps of:
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defining a plurality of stimulus regions based on the first traces and the second traces; providing a first signal for sensing the first traces and a second signal for stimulating the second traces; obtaining and storing calibration parameters for the first traces; deriving ADC values of the stimulus regions using the calibration parameters; and storing the ADC values of the stimulus regions for multi-finger calculation to locate real points. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A sensing method for a capacitive touch panel having a plurality of first traces in a first direction and a plurality of second traces in a second direction, the sensing method comprising the steps of:
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defining a plurality of stimulus regions based on the first traces and the second traces; providing a first signal for sensing the first traces and a second signal for stimulating the second traces; obtaining and storing calibration parameters for the first traces; identifying an object touching any of the first traces; deriving ADC values of all stimulus regions on the traces touched by the object using the calibration parameters; and locating a real point for the object according to the ADC values. - View Dependent Claims (1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77)
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68-1. The sensing method of claim 67, wherein the third signal is a voltage signal or a current signal.
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78. A calibration method for a capacitive touch panel having a plurality of first traces in a first direction and a plurality of second traces in a second direction, the calibration method comprising the steps of:
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providing a first signal for sensing the first traces and a second signal for stimulating the second traces; sensing one of a plurality of stimulus regions defined on the first traces without being touched for an ADC value; determining calibration parameters for the first traces from the ADC value such that the calibrated ADC value will fall within a level range when the stimulus regions are not touched; and storing the calibration parameters for later sensing for ADC values of the first traces. - View Dependent Claims (2, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95)
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95-2. The calibration method of claim 88, wherein the third signal is a common voltage.
Specification