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US 12,769,419 B2Granted
Input sensing device and display device including input sensing device
AssigneeLG Display Co., Ltd.
InventorTaehyung Kim
Life of this patent
Estimating the term…
Abstract
In one or more examples, an input sensing device includes: a plurality of analog front end circuits configured to process touch sensing signals output from a plurality of touch electrodes to generate a sampling signal; and an analog-digital converter configured to convert the sampling signal to generate sensing data. A display device may include the input sensing device.
Claims19
An input sensing device, comprising:
- at least one analog front end circuit configured to process touch sensing signals output from a plurality of touch electrodes and to generate a sampling signal;
- an analog-digital converter configured to convert the sampling signal and to generate sensing data;
- and
- a common voltage driving circuit configured to apply a common voltage signal to the plurality of touch electrodes,
- wherein the common voltage driving circuit comprises:
- a signal delay circuit configured to output a delay signal by delaying an input common voltage signal by a predetermined delay time;
- a comparator configured to output a comparison signal by comparing the delay signal with the input common voltage signal;
- a buffer configured to output a high common voltage or a low common voltage in response to the comparison signal;
- and
- an output circuit configured to amplify a signal output from the buffer by a predetermined ratio and to output the amplified signal as the common voltage signal to an output terminal, and
- wherein the comparator comprises:
- a first comparator configured to output a first comparison signal at a first level when a voltage level of the delay signal is greater than a voltage level of the input common voltage signal and to output the first comparison signal at a second level when the voltage level of the delay signal is equal to or smaller than the voltage level of the input common voltage signal;
- and
- a second comparator configured to output a second comparison signal at the second level when the voltage level of the delay signal is smaller than the voltage level of the input common voltage signal and to output the second comparison signal at the first level when the voltage level of the delay signal is equal to or greater than the voltage level of the input common voltage signal.
11 more elements
A display device, comprising:
- a touch panel on which a plurality of touch electrodes are disposed;
- and
- a touch driving circuit configured to process touch sensing signals output from the plurality of touch electrodes to generate a sampling signal,
- wherein the touch driving circuit comprises:
- a plurality of analog front end circuits configured to process the touch sensing signals and to generate the sampling signal;
- an analog-digital converter configured to convert the sampling signal and to generate sensing data;
- and
- a common voltage driving circuit configured to apply a common voltage signal to the plurality of touch electrodes,
- wherein the common voltage driving circuit comprises:
- a signal delay circuit configured to output a delay signal to an output terminal by delaying an input common voltage signal by a predetermined delay time;
- a comparator configured to output a comparison signal by comparing the delay signal with the input common voltage signal;
- a buffer configured to output a high common voltage or a low common voltage in response to the comparison signal;
- and
- an output circuit configured to amplify a signal output from the buffer by a predetermined ratio and to output the amplified signal as the common voltage signal, and
- wherein the comparator comprises:
- a first comparator configured to output a first comparison signal at a first level when a voltage level of the delay signal is greater than a voltage level of the input common voltage signal and to output the first comparison signal at a second level when the voltage level of the delay signal is equal to or smaller than the voltage level of the input common voltage signal;
- and
- a second comparator configured to output a second comparison signal at the second level when the voltage level of the delay signal is smaller than the voltage level of the input common voltage signal and to output the second comparison signal at the first level when the voltage level of the delay signal is equal to or greater than the voltage level of the input common voltage signal.
15 more elements
Dependencies are inferred from the claim text.