TOUCH SCREEN DEVICE, CAPACITANCE MEASURING CIRCUIT THEREOF, AND METHOD OF MEASURING CAPACITANCE
First Claim
1. A touch screen device comprising:
- a touch panel including a plurality of operation signal lines, a plurality of detection signal lines insulated from the plurality of operation signal lines, and a plurality of node capacitors respectively formed by the corresponding operation signal lines and the corresponding detection signal lines;
a capacitance measuring circuit including a switched capacitor circuit having a plurality of switches, integration capacitors, and operational amplifiers, wherein the integration capacitor is charged to a unit charging voltage during every charging and discharging operation of the node capacitor such that the integration capacitor is charged to a first voltage that is integrated according to a charging and discharging number of the node capacitor and the integration capacitor charged into the first voltage is initialized; and
a touch discriminator configured to analyze the voltage charged to the integration capacitor measured by the capacitance measuring circuit to detect a touch point input by a user.
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Accused Products
Abstract
According to the present invention, a charging and discharging circuit is electrically connected to an operation signal line and a detection signal line, and repeats a charging and discharging operation of a node capacitor. The present invention also includes an integration capacitor electrically connected to the detection signal line and an integration circuit charging the integration capacitor to a unit charging voltage every charging and discharging operation of the node capacitor such that the integration capacitor is charged to a first voltage that is integrated according to a charging and discharging number. The integration circuit may include a reset switch electrically connected to the integration capacitor and discharging the first voltage integrated and charged to the integration capacitor for initializing.
37 Citations
18 Claims
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1. A touch screen device comprising:
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a touch panel including a plurality of operation signal lines, a plurality of detection signal lines insulated from the plurality of operation signal lines, and a plurality of node capacitors respectively formed by the corresponding operation signal lines and the corresponding detection signal lines; a capacitance measuring circuit including a switched capacitor circuit having a plurality of switches, integration capacitors, and operational amplifiers, wherein the integration capacitor is charged to a unit charging voltage during every charging and discharging operation of the node capacitor such that the integration capacitor is charged to a first voltage that is integrated according to a charging and discharging number of the node capacitor and the integration capacitor charged into the first voltage is initialized; and a touch discriminator configured to analyze the voltage charged to the integration capacitor measured by the capacitance measuring circuit to detect a touch point input by a user. - View Dependent Claims (2, 3, 4)
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5. A capacitance measuring circuit electrically connected to a plurality of operation signal lines and a plurality of detection signal lines insulated from the plurality of operation signal lines, and measuring capacitance of a plurality of node capacitors respectively formed by the corresponding operation signal line and the corresponding detection signal line, comprising:
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a charging and discharging circuit electrically connected to the operation signal line and the detection signal line and repeating a charging and discharging operation of the node capacitor several times; and an integration circuit including an operational amplifier having a first input terminal electrically connected to the detection signal line and a second input terminal electrically connected to the first voltage and an integration capacitor electrically connected between the input terminal and the output terminal of the operational amplifier, and charging the integration capacitor to a unit charging voltage every charging and discharging operation of the charging and discharging circuit such that the integration capacitor is charged to a second voltage that is integrated according to a charging and discharging number of the node capacitor, and the charged integration capacitor is initialized. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for measuring capacitance of a capacitor electrically connected to a plurality of operation signal lines and a plurality of detection signal lines insulated from the plurality of operation signal lines, and measuring capacitance of a plurality of node capacitors respectively formed by the corresponding operation signal line and the corresponding detection signal line, comprising:
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executing a charging and discharging operation to the node capacitor; charging an integration capacitor electrically connected to the detection signal line to a unit charging voltage in response to the charging or discharging operation of the node capacitor; repeating the charging and discharging operation of the node capacitor several times; charging the integration capacitor to the unit charging voltage every charging and discharging operation of the node capacitor to charge the integration capacitor to a first voltage that is integrated according to a charging and discharging number of the node capacitor; and discharging the first voltage integrated and charged to the integration capacitor for initialization. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification