Sensing device, touch sensing system, and display device
First Claim
1. A sensing device for determining N touch signals, wherein N is a positive integer, and the sensing device comprising:
- a selector for selecting an ith touch signal and an (i+1)th touch signal from the touch signals according to at least one selection control signal, i is a positive integer from 1 to (N−
1);
a sensing module connecting to the selector in series and comprising;
a first differential amplifier for comparing the selected touch signals and producing a first differential signal according to a plurality of first control signals;
a first sensing line comprising a first switch and a first charge maintenance circuit for receiving the ith touch signal and transmitting the ith touch signal to a first end of the first differential amplifier, wherein the first charge maintenance circuit connects to the first switch in series and receives the ith touch signal when the first switch is closed according to the control of a first part of the first control signals; and
a second sensing line comprising a second switch and a second charge maintenance circuit for receiving the (i+1)th touch signal and transmitting the (i+1)th touch signal to a second end of the first differential amplifier, wherein the second charge maintenance circuit connects to the second switch in series and receives the (i+1)th touch signal when the second switch is closed according to the control of the first part of the first control signals; and
a detection module connecting to the sensing module in series for according to a plurality of second control signals, generating an averaged sensing value and a reference value from the first differential signal and comparing the averaged sensing value with the reference value to produce a second differential signal.
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Accused Products
Abstract
A sensing device placed in a touch sensing system of a display device includes a selector, a sensing module, and a detection module for determining touch signals generated by the touch sensing system. The selector selects two of the touch signals according to at least one selection control signal. The sensing module comprises a first differential amplifier for comparing the selected touch signals and producing a first differential signal according to first control signals. According to second control signals, the detection module receives the first differential signal, generates an averaged sensing value and a reference value, and compares the averaged sensing value with the reference value to produce a second differential signal. Thereby, the touch sensing system uses the second differential signal to generate the first control signals and the second control signals to control the operation of the touch sensing system.
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Citations
19 Claims
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1. A sensing device for determining N touch signals, wherein N is a positive integer, and the sensing device comprising:
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a selector for selecting an ith touch signal and an (i+1)th touch signal from the touch signals according to at least one selection control signal, i is a positive integer from 1 to (N−
1);a sensing module connecting to the selector in series and comprising; a first differential amplifier for comparing the selected touch signals and producing a first differential signal according to a plurality of first control signals; a first sensing line comprising a first switch and a first charge maintenance circuit for receiving the ith touch signal and transmitting the ith touch signal to a first end of the first differential amplifier, wherein the first charge maintenance circuit connects to the first switch in series and receives the ith touch signal when the first switch is closed according to the control of a first part of the first control signals; and a second sensing line comprising a second switch and a second charge maintenance circuit for receiving the (i+1)th touch signal and transmitting the (i+1)th touch signal to a second end of the first differential amplifier, wherein the second charge maintenance circuit connects to the second switch in series and receives the (i+1)th touch signal when the second switch is closed according to the control of the first part of the first control signals; and a detection module connecting to the sensing module in series for according to a plurality of second control signals, generating an averaged sensing value and a reference value from the first differential signal and comparing the averaged sensing value with the reference value to produce a second differential signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A touch sensing system, comprising:
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a touch input interface comprising N signal generation circuits for providing N touch signals to the selector, wherein N is a positive integer; a sensing device connecting to the touch input interface in series and comprising; a selector for selecting an ith touch signal and an (i+1)th touch signal from the touch signals according to at least one selection control signal, i is a positive integer from 1 to (N−
1);a sensing module connecting to the selector in series and comprising a first differential amplifier to compare the selected touch signals and produce a first differential signal according to a plurality of first control signals; and a detection module connecting to the sensing module in series for according to a plurality of second control signals, generating an averaged sensing value and a reference value from the first differential signal and comparing the averaged sensing value and the reference value to produce a second differential signal; and a control module connecting to the detection module in series for according to the second differential signal, generating the first control signals and the second control signals; wherein an ith signal generation circuit of the N signal generation circuits and an (i+1)th sense capacitance circuit of N sense capacitance circuits are selected by the selector and operate synchronously according to a first part and a second part of the first control signals, an ith sense capacitance circuit providing the ith touch signal is adjacent to the (i+1)th sense capacitance circuit providing the (i+1)th touch signal; wherein the ith sense capacitance circuit and the (i+1)th sense capacitance circuit respectively comprising; a capacitor; and a first switch connecting to the capacitor in parallel for controlling the operation of the capacitor; wherein the ith sense capacitance circuit connects to the (i+1)th sense capacitance circuit in parallel through two second switches which connect to each other in series, the second switches operate synchronously and are controlled by the first part of the first control signals, and the first switches are controlled by the second part of the first control signals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification