Touch sensing device and method thereof
First Claim
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1. A touch sensing device, comprising:
- a plurality of sensing circuit units to measure capacitance variations from a plurality of sensing electrodes;
at least one time-to-digital converter (TDC) circuit to sequentially receive the capacitance variations from the plurality of sensing circuit units to generate digital signals by measuring a time required for a voltage signal corresponding to a capacitance variation of the capacitance variations to be varied to have a predetermined reference voltage;
a calculating unit to judge a touch from the digital signals;
a delay circuit to control, using a plurality of predetermined delay time periods, individual circuit units of the plurality of sensing circuit units to detect the capacitance variations during different respective time periods,wherein a first of the plurality of predetermined delay time periods partialy overlaps a second of the plurality of predetermined delay time periods, andwherein a time period length of each of the the plurality of predetermined delay time periods is based on a time required for the at least one TDC circuit to generate the digital signals and a time difference between a minimum time and a maximum time required for the voltage signal to be varied to have the predetermined reference voltage; and
a switching circuit to control connections between the plurality of sensing circuit units and the at least one TDC circuit in synchronization with the plurality of predetermined delay time periods.
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Abstract
There are provided a touch sensing device and a method thereof. The touch sensing device, including: a plurality of sensing circuit units measuring capacitance variations from a plurality of sensing electrodes; at least one TDC circuit connected with the plurality of sensing circuit units to convert the capacitance variations into digital signals; a calculating unit judging a touch from the digital signals; and a delay circuit sequentially receiving the capacitance variations from the plurality of sensing circuit units.
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Citations
8 Claims
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1. A touch sensing device, comprising:
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a plurality of sensing circuit units to measure capacitance variations from a plurality of sensing electrodes; at least one time-to-digital converter (TDC) circuit to sequentially receive the capacitance variations from the plurality of sensing circuit units to generate digital signals by measuring a time required for a voltage signal corresponding to a capacitance variation of the capacitance variations to be varied to have a predetermined reference voltage; a calculating unit to judge a touch from the digital signals; a delay circuit to control, using a plurality of predetermined delay time periods, individual circuit units of the plurality of sensing circuit units to detect the capacitance variations during different respective time periods, wherein a first of the plurality of predetermined delay time periods partialy overlaps a second of the plurality of predetermined delay time periods, and wherein a time period length of each of the the plurality of predetermined delay time periods is based on a time required for the at least one TDC circuit to generate the digital signals and a time difference between a minimum time and a maximum time required for the voltage signal to be varied to have the predetermined reference voltage; and a switching circuit to control connections between the plurality of sensing circuit units and the at least one TDC circuit in synchronization with the plurality of predetermined delay time periods. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch sensing method, comprising:
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measuring, using a plurality of sensing circuit units, a plurality of capacitance variations at different respective times from a plurality of sensing electrodes; generating digital signals by sequentially receiving, using a time-to-digital converter (TDC), the plurality of capacitance variations; and judging a touch based on the generated digital signals, controlling, using a plurality of predetermined delay time periods, individual circuit units of the plurality of sensing circuit units to detect the capacitance variations during different respective time periods, wherein a first of the plurality of predetermined delay time periods partialy overlaps a second of the plurality of predetermined delay time periods, and wherein a time period length of each of the the plurality of predetermined delay time periods is based on a time required for the at least one TDC circuit to generate the digital signals and a time difference between a minimum time and a maximum time required for the voltage signal to be varied to have the predetermined reference voltage; and controlling, using a switching circuit, connections between the plurality of sensing circuit units and the at least one TDC circuit in synchronization with the plurality of predetermined delay time periods. - View Dependent Claims (8)
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Specification