Touch panel
First Claim
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1. A touch panel comprising:
- a pixel comprising a transistor, and a light-emitting element;
a touch sensor comprising a first electrode configured to supply a pulse signal, and a second electrode configured to sense a signal in accordance with the pulse signal; and
an integrator circuit comprising an operational amplifier,wherein;
the light-emitting element comprises a pixel electrode, a common electrode, and a light-emitting layer therebetween,the operational amplifier comprises a first input terminal electrically connected to the second electrode, and a second input terminal electrically connected to the common electrode,the second input terminal is configured to receive a first signal including a noise waveform generated in the common electrode,the first input terminal is configured to receive a second signal including the noise waveform, and a signal waveform based on the pulse signal, andthe operational amplifier is configured to cancel the noise waveform by a difference between the first and second signals.
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Abstract
A touch panel or the like having a novel structure in which an influence of noise of an electrode included in an organic EL element on an electrode for touch sensing can be suppressed is provided.
A voltage of the electrode for touch sensing and a voltage for reference are input to input terminals of an operational amplifier, and in an integrator circuit in which a change in capacitance due to touch sensing is sensed, the input terminal to which the voltage for reference is supplied is connected to a common electrode included in the organic EL element. Such a structure does not amplify but can cancel noise of the electrode for touch sensing, on which noise of the common electrode is superimposed.
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Citations
12 Claims
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1. A touch panel comprising:
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a pixel comprising a transistor, and a light-emitting element; a touch sensor comprising a first electrode configured to supply a pulse signal, and a second electrode configured to sense a signal in accordance with the pulse signal; and an integrator circuit comprising an operational amplifier, wherein; the light-emitting element comprises a pixel electrode, a common electrode, and a light-emitting layer therebetween, the operational amplifier comprises a first input terminal electrically connected to the second electrode, and a second input terminal electrically connected to the common electrode, the second input terminal is configured to receive a first signal including a noise waveform generated in the common electrode, the first input terminal is configured to receive a second signal including the noise waveform, and a signal waveform based on the pulse signal, and the operational amplifier is configured to cancel the noise waveform by a difference between the first and second signals. - View Dependent Claims (3, 5, 7, 9, 11)
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2. A touch panel comprising:
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a pixel comprising a transistor, and a light-emitting element electrically connected to a current supply line through the transistor; a touch sensor comprising a first electrode configured to supply a pulse signal, and a second electrode configured to sense a signal in accordance with the pulse signal; and an integrator circuit comprising an operational amplifier, wherein; the light-emitting element comprises a pixel electrode, a common electrode, and a light-emitting layer therebetween, the operational amplifier comprises a first input terminal electrically connected to the second electrode, and a second input terminal electrically connected to the current supply line, the second input terminal is configured to receive a first signal including a noise waveform generated in the current supply line, the first input terminal is configured to receive a second signal including the noise waveform, and a signal waveform based on the pulse signal, and the operational amplifier is configured to cancel the noise waveform by a difference between the first and second signals. - View Dependent Claims (4, 6, 8, 10, 12)
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Specification