SENSOR AND SENSOR-EQUIPPED DISPLAY DEVICE
First Claim
Patent Images
1. A sensor-equipped display device comprising:
- a scanning line;
a signal line;
a pixel switch connected to the scanning line and the signal line;
a pixel electrode connected to the pixel switch;
a first common electrode;
a detection electrode;
a current mirror circuit including a first transistors and a second transistor, the first transistor including a first gate electrode, a first electrode connected to a first power supply and a second electrode connected to the detection electrode and the first gate electrode, the second transistor including a second gate electrode connected to the first gate electrode, a third electrode connected to the first power supply, and a fourth electrode; and
an integrator including an operational amplifier and a capacitor, the operational amplifier including an inverting input terminal connected to the fourth electrode and a noninverting input terminal connected to a second power supply, the capacitor being connected between an output terminal and the inverting input terminal of the operational amplifier.
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Abstract
According to one embodiment, a sensor-equipped display device includes a scanning line, a signal line, a pixel switch, a pixel electrode, a first common electrode, a detection electrode, a current mirror circuit, and an integrator. The integrator includes an operational amplifier including an inverting input terminal and a noninverting input terminal.
17 Citations
14 Claims
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1. A sensor-equipped display device comprising:
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a scanning line; a signal line; a pixel switch connected to the scanning line and the signal line; a pixel electrode connected to the pixel switch; a first common electrode; a detection electrode; a current mirror circuit including a first transistors and a second transistor, the first transistor including a first gate electrode, a first electrode connected to a first power supply and a second electrode connected to the detection electrode and the first gate electrode, the second transistor including a second gate electrode connected to the first gate electrode, a third electrode connected to the first power supply, and a fourth electrode; and an integrator including an operational amplifier and a capacitor, the operational amplifier including an inverting input terminal connected to the fourth electrode and a noninverting input terminal connected to a second power supply, the capacitor being connected between an output terminal and the inverting input terminal of the operational amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A sensor-equipped display device comprising:
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a scanning line; a signal line; a pixel switch connected to the scanning line and the signal line; a pixel electrode connected to the pixel switch; a control line; a detection line; a detection switch connected to the control line and the detection line; a detection electrode connected to the detection switch; an integrator including an operation amplifier and a capacitor, the operational amplifier including an inverting input terminal and a non-inverting input terminal connected to a second power supply, the capacitor connected between an output terminal and the inverting input terminal of the operational amplifier; and a drive switch a state of which is switched to one of a write state in which the drive switch electrically connects the first power supply and the detection line and a read state in which the drive switch electrically connects the inverting input terminal and the detection line, wherein the state of the drive switch is repeatedly switched from the read state to the write state and from the write state to the read state, to thereby accumulate in the capacitor, charge an amount of which corresponds to that of charging performed a number of times, the state of the drive state being switched to the write state to charge the detection electrode, and being switched to the read state to discharge the detection electrode and charge the capacitor.
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13. A sensor comprising:
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a control line; a detection line; a detection switch connected to the control line and the detection line; a common electrode provided above the control line, the detection line and the detection switch and opposite to the control line, the detection line and the detection switch, the common electrode including an opening; a detection electrode provided above the common electrode and opposite to the opening, and connected to the detection switch through the opening; a first circuit connected to the control line, and supplies the control line with a drive signal for causing a state of the detection switch to be switched to one of a first connection state and a second connection state, the first connection state being a state in which the detection switch electrically connects the detection line and the detection electrode, the second connection state being a state in which the detection switch electrically disconnects the detection line and the detection electrode from each other; a current mirror circuit including a first transistor and a second transistor, the first transistor including a first gate electrode, a first electrode connected to a first power supply and a second electrode connected to the detection electrode and the first gate electrode, the second transistor including a second gate electrode connected to the first gate electrode, a third electrode connected to the first power supply, and a fourth electrode; and an integrator including an operational amplifier and a capacitor, the operational amplifier including an inverting input terminal connected to the fourth electrode and a non-inverting input terminal connected to a second power supply, the capacitor connected between an output terminal and the inverting input terminal of the operational amplifier. - View Dependent Claims (14)
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Specification