SIGNAL CONVERSION CONTROL CIRCUIT FOR TOUCH SCREEN AND METHOD THEREOF
First Claim
1. A signal conversion control circuit applied to a touch screen, comprising:
- an analog-to-digital converter having an input end for receiving an output signal of a touch screen;
a first sample-and-hold circuit configured to provide the analog-to-digital converter with a high-level reference voltage;
a second sample-and-hold circuit configured to provide the analog-to-digital converter with a low-level reference voltage;
a first switch connecting a supplied voltage to the touch screen;
a second switch connecting the touch screen to a ground potential;
a third switch connecting the supplied voltage to the first sample-and-hold circuit through the first switch; and
a fourth switch connecting the ground potential to the second sample-and-hold circuit through the second switch.
4 Assignments
0 Petitions
Accused Products
Abstract
A signal conversion control circuit comprises an analog-to-digital converter, a first sample-and-hold circuit, a second sample-and-hold circuit, a first switch, a second switch, a third switch, and a fourth switch. The analog-to-digital converter has an input end for receiving an output signal of a touch screen. The first sample-and-hold circuit is configured to provide the analog-to-digital converter with a high-level reference voltage. The second sample-and-hold circuit is configured to provide the analog-to-digital converter with a low-level reference voltage. The first switch connects a supplied voltage to the touch screen. The second switch connects the touch screen to a ground potential. The third switch connects the supplied voltage to the first sample-and-hold circuit through the first switch. The fourth switch connects the ground potential to the second sample-and-hold circuit through the second switch.
19 Citations
18 Claims
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1. A signal conversion control circuit applied to a touch screen, comprising:
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an analog-to-digital converter having an input end for receiving an output signal of a touch screen; a first sample-and-hold circuit configured to provide the analog-to-digital converter with a high-level reference voltage; a second sample-and-hold circuit configured to provide the analog-to-digital converter with a low-level reference voltage; a first switch connecting a supplied voltage to the touch screen; a second switch connecting the touch screen to a ground potential; a third switch connecting the supplied voltage to the first sample-and-hold circuit through the first switch; and a fourth switch connecting the ground potential to the second sample-and-hold circuit through the second switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A signal conversion control circuit applied to a touch screen, comprising:
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a first switch connecting a supplied voltage to the touch screen; a second switch connecting the touch screen to a ground potential; an analog-to-digital converter having a high-level reference voltage terminal connected to the supplied voltage, and a low-level reference voltage terminal connected to the ground potential; and a sample-and-hold circuit configured to provide the analog-to-digital converter with sampled signals of the supplied voltage, the ground potential and an output signal of the touch screen. - View Dependent Claims (11)
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12. A method for controlling signal conversion of a touch screen, the method comprising the steps of:
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sampling and holding a supplied voltage of the touch screen; sampling and holding a ground potential of the touch screen; and converting an analog output signal into a digital output signal according to the sampled-and-held supplied voltage and ground potential. - View Dependent Claims (13, 14, 15)
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16. A method for controlling signal conversion of a touch screen, the method comprising the steps of:
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converting a maximal value of analog output signals of the touch screen into a maximal digital signal; converting a minimal value of analog output signals of the touch screen into a minimal digital signal; converting the analog signals into digital signals; and adjusting the digital signals according to the maximal digital signal and the minimal digital signal. - View Dependent Claims (17, 18)
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Specification