Touch sensing circuit and control method thereof for high resolution fingerprint recognition
First Claim
1. A touch sensing circuit, comprising:
- a plurality of detecting units arranged in an array, wherein each detecting unit includes;
a sensing pad;
a first switch configured to selectively conduct the sensing pad and one of a plurality of signal lines; and
a second switch configured to selectively conduct the sensing pads of the detecting unit and the adjacent detecting unit;
wherein in a first operating stage, the first switches in a first row of the array are turned on, such that the sensing pads in the first row are configured to output a plurality of detecting signals to the signal lines according to a first driving signal, and the second switches in a second row of the array adjacent to the first row are turned on, such that the sensing pads in the second row are electrically coupled in series to receive the first driving signal;
wherein in a second operating stage, the first switches in the second row of the array are turned on, such that the sensing pads in the second row are configured to output a plurality of detecting signals to the signal lines according to a second driving signal, and the second switches in a third row of the array adjacent to the second row are turned on, such that the sensing pads in the third row are electrically coupled in series to receive the second driving signal.
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Abstract
A touch sensing circuit and its control method is disclosed herein. The touch sensing circuit includes a plurality of detecting units. The detecting units are arranged in an array, in which each detecting unit includes a sensing pad, a first switch and a second switch. The first switch is configured to selectively conduct the sensing pad and one of a plurality of signal lines. The second switch is configured to selectively conduct two adjacent sensing pads. When the first switches in a first row in the array are on, the sensing pads in the first row are configured to output detecting signals to the signal lines according to a driving signal, and the second switches in a second row adjacent to the first row are on to conduct the sensing pads in the second row to receive and transmit the driving signal together.
10 Citations
18 Claims
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1. A touch sensing circuit, comprising:
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a plurality of detecting units arranged in an array, wherein each detecting unit includes; a sensing pad; a first switch configured to selectively conduct the sensing pad and one of a plurality of signal lines; and a second switch configured to selectively conduct the sensing pads of the detecting unit and the adjacent detecting unit; wherein in a first operating stage, the first switches in a first row of the array are turned on, such that the sensing pads in the first row are configured to output a plurality of detecting signals to the signal lines according to a first driving signal, and the second switches in a second row of the array adjacent to the first row are turned on, such that the sensing pads in the second row are electrically coupled in series to receive the first driving signal; wherein in a second operating stage, the first switches in the second row of the array are turned on, such that the sensing pads in the second row are configured to output a plurality of detecting signals to the signal lines according to a second driving signal, and the second switches in a third row of the array adjacent to the second row are turned on, such that the sensing pads in the third row are electrically coupled in series to receive the second driving signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A touch sensing circuit, comprising:
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a plurality of first sensing pads; a plurality of second sensing pads; and a plurality of third sensing pads; wherein in a first operating stage, the first sensing pads are conducted to a plurality of signal lines correspondingly according to a first control signal, and the second sensing pads are electrically coupled in series to receive a first driving signal such that the first sensing pads are configured to output a plurality of detecting signals to corresponding signal lines according to the first driving signal, wherein within the first operating stage the first driving signal has a non-zero frequency while the first control signal remains at the same level; wherein in a second operating stage, the second sensing pads are conducted to the signal lines correspondingly, and the third sensing pads are electrically coupled in series to receive a second driving signal such that the second sensing pads are configured to output the detecting signals to corresponding signal lines according to the second driving signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A control method of a touch sensing circuit, wherein the touch sensing circuit comprises a plurality of signal lines, a plurality of first sensing pads, a plurality of second sensing pads and a plurality of third sensing pads, and the control method comprises:
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in a first operating stage, conducting the first sensing pads to the corresponding signal lines; in the first operating stage, electrically coupling the second sensing pads in series; in the first operating stage, providing a first driving signal to the second sensing pads; in the first operating stage, reading, from the signal lines, a plurality of detecting signals outputted by the first sensing pads according to the first driving signal in a second operating stage, conducting the second sensing pads to the corresponding signal lines; in the second operating stage, electrically coupling the third sensing pads in series; in the second operating stage, providing a second driving signal to the third sensing pads; and in the second operating stage, reading, from the signal lines, the detecting signals outputted by the second sensing pads according to the second driving signal. - View Dependent Claims (17, 18)
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Specification