Sensing method and calibration method for a capacitive touch panel
First Claim
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1. 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, wherein each first trace corresponds to at least two of the stimulus regions;
sensing the first plurality of stimulus regions by providing a first signal for sensing the first traces and a second signal for stimulating the second traces, and by providing the first signal for sensing the second traces and the second signal for stimulating the first traces;
obtaining and storing first calibration parameters for the first traces and second calibration parameters for the second traces;
respectively deriving first ADC values and second ADC values of the stimulus regions according to a result of sensing the plurality of stimulus regions, the first calibration parameters and the second calibration parameters; and
storing the first ADC values and the second ADC values of the stimulus regions for position calculation or multi-finger calculation to locate a real point;
wherein the second signal is not simultaneously provided to all the first traces or all the second traces.
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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.
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Citations
74 Claims
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1. 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, wherein each first trace corresponds to at least two of the stimulus regions; sensing the first plurality of stimulus regions by providing a first signal for sensing the first traces and a second signal for stimulating the second traces, and by providing the first signal for sensing the second traces and the second signal for stimulating the first traces; obtaining and storing first calibration parameters for the first traces and second calibration parameters for the second traces; respectively deriving first ADC values and second ADC values of the stimulus regions according to a result of sensing the plurality of stimulus regions, the first calibration parameters and the second calibration parameters; and storing the first ADC values and the second ADC values of the stimulus regions for position calculation or multi-finger calculation to locate a real point; wherein the second signal is not simultaneously provided to all the first traces or all the second traces. - View Dependent Claims (2, 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)
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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, 55)
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56. 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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obtaining respective ADC values of the first traces, each of which is performed by sensing one of a plurality of stimulus regions on one first trace, the sensing of one stimulus region comprising the steps of providing a first signal for sensing the first trace and stimulating a part of the second traces; determining a calibration parameter for each first trace according to the respective ADC values of the first traces; and storing the calibration parameters for later sensing for ADC values of stimulus regions on the first traces. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74)
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Specification