Proximity detection device and proximity detection method
First Claim
1. A proximity detection device for detecting an approach and/or a position of an object, the proximity detection device comprising:
- plural transmitting electrodes corresponding to one of two dimensions in a detection area on a supporting unit and receiving electrodes corresponding to the other of the two dimensions of the detection area;
a multiline driving unit that simultaneously applies periodic alternating voltages to at least two electrodes of the transmitting electrodes to drive the at least two transmitting electrodes;
a current measurement unit that measures current values or amounts of accumulated charge from the receiving electrodes in synchronization with driving of the at least two transmitting electrodes;
a computing unit that calculates the approach and/or the position of the object toward the detection area by converting the current values or the amounts of accumulated charge measured by the current measurement unit into values in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes; and
a control unit that manages statuses and sequences of the multiline driving unit, the current measurement unit, and the computing unit,wherein the computing unit includes;
a linear computing unit that performs linear computation to convert the current values or the amounts of accumulated charge measured by the current measurement unit into values in response to the electrostatic capacitances of the respective intersections between the transmitting electrodes and the receiving electrodes, anda proximity computing unit that computes the approach and/or the position of the object toward the detection area from an output of the linear computing unit, andwherein the linear computing unit includes a memory unit that stores an interim result of the linear computation performed by the linear computing unit so as to allow the interim result to be read out at plural times.
10 Assignments
0 Petitions
Accused Products
Abstract
A proximity detection device has transmitting and receiving electrodes and a multiline driving unit that simultaneously applies periodic alternating voltages to at least two of the transmitting electrodes. A measurement unit measures currents or amounts of accumulated charge from the receiving electrodes in synchronization with the simultaneous application of periodic alternating voltages to the at least two transmitting electrodes by the multiline driving unit. A linear computing unit performs linear computation of measurement results from a measurement unit in response to electrostatic capacitances of respective intersections between the transmitting and receiving electrodes. The linear computing unit has a memory unit that stores an output of the linear computation for readout at plural times. A proximity computing unit performs a computation to determine an approach and/or a position of an object relative to a detection area based on the output from the linear computing unit stored in the memory unit.
-
Citations
20 Claims
-
1. A proximity detection device for detecting an approach and/or a position of an object, the proximity detection device comprising:
-
plural transmitting electrodes corresponding to one of two dimensions in a detection area on a supporting unit and receiving electrodes corresponding to the other of the two dimensions of the detection area; a multiline driving unit that simultaneously applies periodic alternating voltages to at least two electrodes of the transmitting electrodes to drive the at least two transmitting electrodes; a current measurement unit that measures current values or amounts of accumulated charge from the receiving electrodes in synchronization with driving of the at least two transmitting electrodes; a computing unit that calculates the approach and/or the position of the object toward the detection area by converting the current values or the amounts of accumulated charge measured by the current measurement unit into values in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes; and a control unit that manages statuses and sequences of the multiline driving unit, the current measurement unit, and the computing unit, wherein the computing unit includes; a linear computing unit that performs linear computation to convert the current values or the amounts of accumulated charge measured by the current measurement unit into values in response to the electrostatic capacitances of the respective intersections between the transmitting electrodes and the receiving electrodes, and a proximity computing unit that computes the approach and/or the position of the object toward the detection area from an output of the linear computing unit, and wherein the linear computing unit includes a memory unit that stores an interim result of the linear computation performed by the linear computing unit so as to allow the interim result to be read out at plural times. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A proximity detection method for detecting an approach and/or a position of an object, comprising:
-
simultaneously applying periodic alternating voltages to plural transmitting electrodes corresponding to one dimension of two dimensions in a detection area for detection of the approach of the object; measuring currents or amounts of accumulated charge from receiving electrodes corresponding to the other of the two dimensions in the detection area in synchronization with driving of the transmitting electrodes; and performing linear computation by a fast Hadamard transform;
performing conversion into values in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes, and performing computation to detect the approach and/or the position of the object toward the detection area. - View Dependent Claims (13, 14, 15, 16)
-
-
17. A proximity detection device for detecting an approach and/or a position of an object relative to a detection area, the proximity detection device comprising:
-
a plurality of transmitting electrodes and receiving electrodes associated with the detection area; a multiline driving unit that simultaneously applies periodic alternating voltages to at least two of the transmitting electrodes; a measurement unit that measures magnitudes of currents or amounts of accumulated charge from the plurality of receiving electrodes in synchronization with the simultaneous application of periodic alternating voltages to the at least two transmitting electrodes by the multiline driving unit; a linear computing unit that performs linear computation of measurement results from the measurement unit in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes, the linear computing unit having a memory unit that stores an output of the linear computation for readout at plural times; and a proximity computing unit that performs a computation to determine an approach and/or a position of an object relative to the detection area based on the output from the linear computing unit stored in the memory unit. - View Dependent Claims (18, 19, 20)
-
Specification