WO2018143653A1 - Device and method for recognizing touch input and fingerprint input - Google Patents

Abstract

Disclosed are a device and a method for recognizing a touch input and a fingerprint input. The device for recognizing a touch input and a fingerprint input, according to one embodiment of the present invention, may comprise: a first sensor node which outputs a reference signal as a first current signal by using a first current conveyor; a second sensor node which, by using a second current conveyor, outputs a second current signal which is a combination of the reference signal and a sensor input signal; a subtraction unit which outputs the sensor input signal as a third current signal by subtracting the outputted first current signal from the outputted second current signal; and a signal transformation unit which transforms the outputted third current signal into a digital current signal and feeds back the transformed digital current signal, and transforms the outputted third current signal into a digital code on the basis of a ratio of the outputted third current signal and the fed back digital current signal.

Description

Apparatus and method for recognizing touch input and fingerprint input

The present invention relates to a technical concept of recognizing a touch input and a fingerprint input. More specifically, the present invention relates to a touch input on a touch screen panel and a fingerprint input on a fingerprint recognition panel in an integrated circuit (IC). An apparatus and a method for recognizing are provided.

According to the prior art, the electronic device may perform fingerprint recognition and touch recognition through different circuits or different processors.

1A is a block diagram of an electronic device including a touch screen panel and a fingerprint recognition panel according to the prior art.

Referring to FIG. 1A, a conventional electronic device 100 including a touch screen panel 110 and a fingerprint recognition panel 120 may recognize a first circuit 112 and a fingerprint input to recognize and process a touch input. A second circuit 122 for processing is included.

In addition, the conventional electronic device 100 may recognize the touch input through the first circuit 112 and recognize the fingerprint input through the second circuit 122. That is, the conventional electronic device 100 may recognize the touch input and the fingerprint input through separate circuits for recognizing the touch input and the fingerprint input, respectively.

1B illustrates circuit configurations of an electronic device according to the prior art.

Specifically, (a) of FIG. 1B illustrates a configuration of a first circuit for recognizing a touch input, and FIG. 1B (b) illustrates a configuration of a first circuit that receives a voltage corresponding to a fingerprint input. FIG. 1B (c) illustrates a configuration of a second circuit for recognizing a fingerprint input, and FIG. 1B (d) illustrates a configuration of a second circuit that receives a voltage corresponding to a touch input.

First, referring to FIG. 1B (a), the capacitor 130 has a capacitive capacity of 2 pico farads, and the capacitor 132 has a capacitive capacity of 10 pico farts.

A conventional electronic device may detect an input signal as a voltage signal based on Equation 1. Equation 1 is as follows.

[Equation 1]

According to Equation 1, V _M may represent a conversion voltage, V _TX may represent an input voltage, C _M may represent a capacitor value in which a current corresponding to a sensor input signal is charged in a capacitor, and C _F May represent the feedback capacitor value.

Referring to (b) of FIG. 1B, the capacitor 134 is charged with 10 femto farads and then discharged, and the capacitor 136 has a capacitive capacity of 10 pico farts. That is, when the fingerprint input is detected through the first circuit for detecting the touch input, the electronic device has a large value of the capacitor 136 in comparison with the value of the capacitor 134, and thus the converted voltage is expressed based on Equation 1. There is a problem that is too small to recognize.

Referring to FIG. 1B (c), in the second circuit, the capacitor 140 has a capacitive capacity of 10 femto parrots, and the capacitor 142 has a capacitive capacity of 50 femto parrots.

Next, referring to FIG. 1B (d), two pico-farads are charged in the capacitor 144 and then discharged, and the capacitor 146 has a capacitive capacity of 50 femto-farads. That is, when the touch input is sensed through the second circuit sensing the fingerprint input, the electronic device has a small value of the capacitor 146 relative to the value of the capacitor 144, so that the converted voltage based on Equation 1 There is a problem that the output voltage is saturated with the large, the input is not recognized.

Therefore, there is a need to study a technology capable of simultaneously recognizing touch input and fingerprint input in one type of circuit.

An object of the present invention is to provide an apparatus and method for recognizing a touch input and a fingerprint input.

The present invention seeks to provide an apparatus and method for calculating the differential current of adjacent channels using a current conveyor.

An object of the present invention is to provide an apparatus and method for separating only a differential current corresponding to an amount of change in capacitance when sensing an input on a sensor interface.

An object of the present invention is to provide an apparatus and method for converting a digital code based on a ratio of an input current and a feedback digital current using a loop filter.

The present invention obtains only the differential current corresponding to either the touch input or the fingerprint input, and then converts the differential current into a digital code based on the ratio of the differential current and the digital current signal fed back by the signal converter regardless of the feedback voltage. An apparatus and method for converting are provided.

An apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention includes a first sensor node that outputs a reference signal as a first current signal using a first current conveyor, and the reference signal using a second current conveyor. And a second sensor node for outputting a second current signal combined with a sensor input signal, and subtracting the output first current signal from the output second current signal to output the sensor input signal as a third current signal. And converting the output third current signal into a digital current signal to feed back the converted digital current signal, and based on a ratio of the output third current signal and the fed back digital current signal, the output third It may include a signal converter for converting the current signal into a digital code.

An apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention receives the sensor input signal and the reference signal including at least one of a touch input and a fingerprint input, and receives the received sensor input signal and the The second current signal may be output by combining the received reference signals.

The apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention may include a sensor channel positioned adjacent to the second sensor node in a sensor interface that recognizes one of the touch input and the fingerprint input.

An apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention performs current copying on at least one of the reference signal and the sensor input signal using the second current conveyor to perform the current copying. At least one of the sensor input signals may be output as multiple signals.

An apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention may receive the reference signal associated with at least one of a current, a charge, and a capacitor input converted from an input voltage.

An apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention may receive the sensor input signal associated with at least one of a current, a charge, and a capacitor input converted from an input voltage.

An apparatus for recognizing touch input and fingerprint input according to an embodiment of the present invention includes a delta-sigma analog-to-digital converter and a delta-sigma digital-to-analog. -analog) may include any one of the converter.

According to an embodiment of the present invention, a device for recognizing a touch input and a fingerprint input includes a bit density of the digital code through charge balancing of the output third current signal and the fed back digital current signal. ) Can be determined.

An apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention may calculate the bit density by dividing a bit corresponding to the output third current signal by a bit corresponding to the feedback digital current signal. Can be.

According to an embodiment of the present disclosure, a method of recognizing a touch input and a fingerprint input may include outputting a reference signal as a first current signal using a first current conveyor at a first sensor node, and at the second sensor node, Outputting a second current signal in which the reference signal and the sensor input signal are combined by using a current conveyor; subtracting the output first current signal from the output second current signal in the subtractor to input the sensor Outputting a signal as a third current signal and in a signal converter, converting the output third current signal into a digital current signal to feed back the converted digital current signal, and outputting the output third current signal and the feedback The method may include converting the output third current signal into a digital code based on the ratio of the digital current signal.

According to an embodiment of the present invention, a method of recognizing a touch input and a fingerprint input may include receiving, at the second sensor node, the sensor input signal and the reference signal including at least one of a touch input and a fingerprint input. And combining the received sensor input signal with the received reference signal to output the second current signal.

The method of recognizing a touch input and a fingerprint input according to an embodiment of the present invention may further include receiving the reference signal associated with at least one of a current, a charge, and a capacitor input converted from a first input voltage. .

According to an embodiment of the present disclosure, a method of recognizing a touch input and a fingerprint input may include receiving the reference signal associated with at least one of a current, a charge, and a capacitor input converted from a second input voltage and the second input voltage. The method may further include receiving the sensor input signal associated with at least one of a current, a charge, and a capacitor input that is converted from.

In the method for recognizing a touch input and a fingerprint input according to an embodiment of the present invention, the signal converter may include the digital code through charge balancing of the output third current signal and the fed back digital current signal. The method may further include determining a bit density of.

According to an embodiment of the present invention, a method of recognizing a touch input and a fingerprint input calculates the bit density by dividing a bit corresponding to the output third current signal by a bit corresponding to the fed back digital current signal. It may include the step.

According to an embodiment of the present invention, an apparatus for recognizing a touch input and a fingerprint input may simultaneously process the touch input and the fingerprint input through a single circuit.

In addition, according to an embodiment of the present invention, the device for recognizing the touch input and the fingerprint input may calculate the differential current of the adjacent channel using the current conveyor.

In addition, according to an embodiment of the present invention, the device for recognizing the touch input and the fingerprint input may separate only the differential current corresponding to the amount of change in capacitance when the input is detected on the sensor interface.

In addition, according to an embodiment of the present invention, the device for recognizing the touch input and the fingerprint input may be converted into a digital code based on the ratio of the input current and the feedback digital current using a loop filter.

According to an embodiment of the present invention, the device for recognizing the touch input and the fingerprint input acquires only the differential current corresponding to any one of the touch input and the fingerprint input, and then the differential current and the signal converting unit regardless of the feedback voltage. The differential current can be converted into a digital code based on the ratio of the digital current signal fed back.

In addition, according to an embodiment of the present invention, an apparatus for recognizing a touch input and a fingerprint input may reduce quantization noise through a loop filter.

In addition, according to an embodiment of the present invention, an apparatus for recognizing touch input and fingerprint input may add over-integrators to a loop filter to increase the integral order for signal calculation, thereby over-sampling to reduce quantization noise. Can reduce the degree of

In addition, according to an embodiment of the present invention, the device for recognizing the touch input and the fingerprint input may drive only the differential current corresponding to the amount of change in capacitance, so that the touch screen panel may be driven using a low power voltage supply.

In addition, according to an embodiment of the present invention, the device for recognizing the touch input and the fingerprint input may separate only the differential current corresponding to the amount of change in capacitance, so that the fingerprint recognition panel may be driven using the high power voltage supply unit.

Further, according to an embodiment of the present invention, the device for recognizing touch input and fingerprint input is converted from the output current of the current buffer according to the ratio of the current output through the current conveyor and the digital current signal converted by the signal converter. The bit density of the digital code can be determined.

Further, according to an embodiment of the present invention, the device for recognizing the touch input and the fingerprint input separates only the differential current corresponding to any one of the touch input and the fingerprint input through a current conveyor, and separates the differential current and the signal converter. By converting the differential current into a digital code based on the ratio of the digital feedback signal fed back, it is possible to recognize either the touch input or the fingerprint input without affecting the feedback current of the amplifier.

1A is a block diagram of an electronic device including a touch screen panel and a fingerprint recognition panel according to the prior art.

1B illustrates circuit configurations of an electronic device according to the prior art.

2 is a block diagram of a system for recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

3 is a block diagram of an apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

4 is a flowchart illustrating a method of recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

5 and 6 illustrate circuit components of an apparatus for recognizing touch input and fingerprint input according to an embodiment of the present invention.

7 illustrates a block diagram of a system for recognizing a touch input and a fingerprint input including a voltage supply unit according to an embodiment of the present invention.

8 shows a block diagram of an apparatus for converting an output of a current buffer into a digital code according to an embodiment of the present invention.

9A and 9B show block diagrams of current buffers in accordance with one embodiment of the present invention.

10 illustrates a flowchart relating to a method of converting the output of a current buffer into a digital code in accordance with one embodiment of the present invention.

11 and 12 illustrate block diagrams related to the operation of converting the output of a current buffer into a digital code in accordance with one embodiment of the present invention.

13 is a block diagram of a sensor input sensing device according to an embodiment of the present invention.

14A and 14B show a block diagram of a circuit configuration of a sensor input sensing device according to an embodiment of the present invention.

15 is a flowchart illustrating a sensor input sensing method using a current conveyor according to an embodiment of the present invention.

16A and 16B show block diagrams relating to the circuit configuration of a current conveyor according to one embodiment of the present invention.

17 is a block diagram related to a circuit configuration for sensing a sensor input by a sensor input sensing device according to an embodiment of the present invention.

Hereinafter, various embodiments of the present disclosure will be described with reference to the accompanying drawings.

The examples and terms used therein are not intended to limit the techniques described in this document to specific embodiments, but should be understood to include various modifications, equivalents, and / or alternatives to the examples.

In the following description of the various embodiments, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, terms to be described below are terms defined in consideration of functions in various embodiments, and may vary according to a user's or operator's intention or custom. Therefore, the definition should be made based on the contents throughout the specification.

In connection with the description of the drawings, similar reference numerals may be used for similar components.

Singular expressions may include plural expressions unless the context clearly indicates otherwise.

In this document, expressions such as "A or B" or "at least one of A and / or B" may include all possible combinations of items listed together.

Expressions such as "first," "second," "first," or "second," etc. may modify the components, regardless of order or importance, to distinguish one component from another. Used only and do not limit the components.

When any (eg first) component is said to be "connected (functionally or communicatively)" or "connected" to another (eg second) component, the other component is said other It may be directly connected to the component or may be connected through another component (for example, the third component).

In this specification, "configured to" is modified to have the ability to "suitable," "to," "to," depending on the context, for example, hardware or software. Can be used interchangeably with "made to", "doing", or "designed to".

In some situations, the expression “device configured to” may mean that the device “can” together with other devices or components.

For example, the phrase “processor configured (or configured to) perform A, B, and C” may be implemented by executing a dedicated processor (eg, an embedded processor) to perform its operation, or one or more software programs stored in a memory device. It may mean a general purpose processor (eg, a CPU or an application processor) capable of performing the corresponding operations.

In addition, the term 'or' means inclusive or 'inclusive or' rather than 'exclusive or'.

In other words, unless stated otherwise or unclear from the context, the expression 'x uses a or b' means any one of natural inclusive permutations.

Used below. Wealth, ' The term 'herein' refers to a unit for processing at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

2 is a block diagram of a system for recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

Referring to FIG. 2A, one of the two touch and fingerprint recognition devices 200 is connected to the touch screen panel 210, and the other is connected to the fingerprint recognition panel 220.

The touch and fingerprint recognition device 200 may recognize both a touch input and a fingerprint input. Here, the touch and fingerprint recognition device 200 connected to the touch screen panel 210 and the touch and fingerprint recognition device 200 connected to the fingerprint recognition panel 220 may include the same circuit components.

Referring to FIG. 2B, one touch and fingerprint recognition device 200 is connected to the touch screen panel 240 and the fingerprint recognition panel 250.

One touch and fingerprint recognition device 200 may recognize both a touch input and a fingerprint input. For example, the touch and fingerprint recognition device 200 may include a device that recognizes a touch input and a fingerprint input.

3 is a block diagram of an apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

Specifically, FIG. 3 illustrates components of an apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

Referring to FIG. 3, the apparatus 300 that recognizes a touch input and a fingerprint input includes a first sensor node 302, a second sensor node 304, a subtraction unit 306, and a signal converter 308. .

According to an embodiment of the present invention, the first sensor node 302 may output the reference signal as the first current signal using the first current conveyor.

For example, the first sensor node 302 may include a sensor channel positioned adjacent to the second sensor node at a sensor interface that recognizes one of a touch input and a fingerprint input.

According to an embodiment, the first sensor node 302 may receive an input voltage corresponding to the reference signal and receive a reference signal associated with at least one of a current, a charge, and a capacitor input converted from the input voltage.

According to an embodiment of the present invention, the second sensor node 304 may output the second current signal in which the reference signal and the sensor input signal are combined using the second current conveyor.

That is, the second sensor node 304 receives a sensor input signal and a reference signal including at least one of a touch input and a fingerprint input, and combines the received sensor input signal and the received reference signal to the second current signal. You can output

For example, the reference signal included in the second current signal may include a current signal emitted from a capacitor C _M included in the second sensor node 304. In addition, the sensor input signal may include a differential current corresponding to any one of a touch input and a fingerprint input.

In addition, the second sensor node 304 performs a current copy on at least one of the reference signal and the sensor input signal using the second current conveyor to output at least one of the reference signal and the sensor input signal as multiple signals. can do.

In one example, the second sensor node 304 may receive a sensor input signal associated with at least one of current, charge, and capacitor input converted from an input voltage.

According to an embodiment of the present invention, the subtraction unit 306 subtracts the first current signal from the second current signal and outputs the sensor input signal as a third current signal.

That is, the subtraction unit 306 subtracts the first current including the reference signal from the second current signal combined with the reference signal and the sensor input signal corresponding to any one of the touch input and the fingerprint input. Only the reference signal is removed, and the sensor input signal may be output as the third current signal.

According to an embodiment of the present invention, the signal converter 308 converts the output third current signal into a digital current signal to feed back the converted digital current signal, and outputs the outputted third current signal and the fed back digital signal. The output third current signal may be converted into a digital code based on a ratio of current signals.

In addition, the signal converter 308 may convert any one of a delta-sigma analog-to-digital converter and a delta-sigma digital-to-analog converter. It may include.

In addition, the signal converter 308 may determine the bit density of the digital code through charge balancing of the output third current signal and the fed back digital current signal.

In addition, the signal converter 308 may calculate the bit density by dividing the bit corresponding to the output third current signal by the bit corresponding to the fed back digital current signal.

4 is a flowchart illustrating a method of recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

In detail, FIG. 4 illustrates a procedure of converting a current signal corresponding to any one of the touch input and the fingerprint input into a digital code in the method of recognizing the touch input and the fingerprint input.

Referring to FIG. 4, in step 401, a method of recognizing a touch input and a fingerprint input outputs a first current signal. That is, the method of recognizing the touch input and the fingerprint input may receive a reference signal associated with at least one of a current, a charge, and a capacitor input converted from the first input voltage, and convert the reference signal into a first current using a first current conveyor. Can be output as a signal.

In operation 403, the method of recognizing the touch input and the fingerprint input outputs a second current signal. That is, the method of recognizing the touch input and the fingerprint input may receive a sensor input signal and a reference signal including at least one of the touch input and the fingerprint input, and output the second current signal by combining the sensor input signal and the reference signal. have.

In operation 405, the method of recognizing the touch input and the fingerprint input outputs a third current signal. That is, the method of recognizing the touch input and the fingerprint input may output the sensor input signal to the third current signal by subtracting the first current signal including the reference signal from the second current signal including the sensor input signal and the reference signal. have.

In step 407, the method of recognizing the touch input and the fingerprint input converts the third current signal into a digital code. That is, the method for recognizing the touch input and the fingerprint input may feed back the converted digital current signal by converting the output third current signal into a digital current signal.

In addition, the method of recognizing the touch input and the fingerprint input may convert the output third current signal into a digital code based on a ratio of the output third current signal and the fed back digital current signal.

5 illustrates circuit components of an apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

Referring to FIG. 5, the device 500 that recognizes a touch input and a fingerprint input includes a first sensor node 510 and a second sensor node 520, a subtraction unit 530, a chopper 540, and a sensor conversion unit ( 550).

According to an embodiment of the present invention, the first sensor node 510 may output the voltage of the capacitor C _M as a first current signal using a first current conveyor (not shown).

For example, the first sensor node 510 may output the reference signal as the first current signal I ₁ using the first current conveyor. Here, the reference signal may include a current signal I _M emitted from the capacitor C _M included in the first sensor node 302.

According to an embodiment of the present invention, the second sensor node 520 uses a second current conveyor (not shown) to apply a voltage corresponding to one of a touch input and a fingerprint input and a reference signal associated with the capacitor C _M. In combination, the second current signal I ₂ may be output. That is, the second current signal I ₂ may include a current signal corresponding to the reference signal and a differential current signal corresponding to any one of a touch input and a fingerprint input. Here, the reference signal may include a current signal I _M emitted from the capacitor C _M included in the second sensor node 302.

According to an embodiment of the present invention, the subtraction unit 530 may output the third current signal by subtracting the first current signal I ₁ from the second current signal. That is, the subtraction unit 530 may output the third current signal from which the reference signal jointly included in the second current signal and the first current signal is removed.

According to an embodiment of the present invention, the chopper 540 may integrate the third current signal through the integrator.

According to an embodiment of the present invention, the signal converter 550 converts the output third current signal into a digital current signal to feed back the converted digital current signal, and outputs the outputted third current signal and the fed back digital current signal. The third current signal output based on the ratio may be converted into a digital code.

6 illustrates circuit components of an apparatus for recognizing a touch input and a fingerprint input according to an embodiment of the present invention.

Specifically, FIG. 6 illustrates a circuit configuration of reducing oversampling time to reduce quantization noise by adding an integrator to a loop filter in an apparatus for recognizing touch input and fingerprint input according to an embodiment of the present invention. To illustrate.

Referring to FIG. 6, an apparatus 600 for recognizing touch input and fingerprint input may include a first sensor node 610, a second sensor node 620, a subtraction unit 630, a chopper 640, and a signal converter ( 660, a loop filter unit 660, and a digital integrator 670.

The loop filter unit 660 may include a plurality of integrators. As an example, the loop filter unit 660 may reduce an oversampling requirement for reducing quantization noise by adding an integrator.

7 illustrates a block diagram of a system for recognizing a touch input and a fingerprint input including a voltage supply unit according to an embodiment of the present invention.

Specifically, FIG. 7 illustrates the touch input and the fingerprint regardless of the magnitude of the voltage input to the touch screen panel 710 and the fingerprint recognition panel 720 in the system for recognizing the touch input and the fingerprint input according to an embodiment of the present invention. Illustrates components of a system that recognizes input.

Referring to FIG. 7A, a system for recognizing touch input and fingerprint input includes a touch and fingerprint recognition apparatus 700, a touch screen panel 710, a fingerprint recognition panel 720, and a first voltage supply unit 730. And a second voltage supply unit 740.

According to an embodiment of the present invention, in the system for recognizing touch input and fingerprint input, the touch and fingerprint recognition apparatus 700 generates only the differential current using the current conveyor, and generates the differential current without being affected by the current of the feedback capacitor. Since it is converted into a digital code, the touch screen panel 710 may recognize a touch input by receiving a low voltage from the first voltage supply unit 730.

In addition, the system that recognizes the touch input and the fingerprint input generates a differential current only by the touch and fingerprint recognition device 700 using a current conveyor, and converts the differential current into a digital code without being affected by the current of the feedback capacitor. The recognition panel 720 may receive a high voltage from the second voltage supply unit 740 to recognize a fingerprint input.

Referring to FIG. 7B, a system for recognizing touch input and fingerprint input includes a touch and fingerprint recognition device 750, a touch screen panel 760, a fingerprint recognition panel 770, and a first voltage supply unit 780. And a second voltage supply unit 790.

According to an embodiment of the present invention, a system for recognizing touch input and fingerprint input includes a voltage input through the first voltage supply unit 780 and the second voltage supply unit 790 through one touch and fingerprint recognition device 750. Based on the touch input through the touch screen panel 760 and the fingerprint input through the fingerprint recognition panel 770 can be recognized.

8 shows a block diagram of an apparatus for converting an output of a current buffer into a digital code according to an embodiment of the present invention.

Specifically, Figure 8 illustrates the components of an apparatus for converting the output of a current buffer into a digital code in accordance with one embodiment of the present invention. Referring to FIG. 8, according to an embodiment of the present invention, an apparatus for converting the output of the current buffer into a digital code includes a current buffer unit 810 and a signal converter 840.

According to an embodiment of the present invention, the current buffer unit 810 may include a current buffer.

According to an embodiment of the present invention, the current buffer unit 810 receives an input signal 812 corresponding to a touch input on a user interface including a capacitive touch sensor. For example, the current buffer unit 810 may receive an input signal 812 corresponding to a touch input sensed by the capacitive touch sensor in the user interface. For example, the input signal 812 may include a voltage signal, a charge signal, and a cap signal.

In addition, the current buffer unit 810 may convert the input signal 812 corresponding to the touch input into a current signal, and output the converted current signal. For example, the current buffer unit 810 may amplify and convert the input signal into a current signal.

In addition, the current buffer unit 810 may receive an input signal 812 through an input terminal, and output a current signal converted from the input signal 812 through an output terminal.

In addition, the current buffer unit 810 detects a common signal among the input signals 812 and feeds the detected common signal as a common mode feedback (CMFB) signal to a differential signal from which the detected common signal is removed. A corresponding current signal can be output.

According to an embodiment of the present invention, the signal converter 840 may receive the current signal output from the current buffer and convert the received current signal into the digital current signal 842.

In addition, the signal converter 840 may feed back the converted digital current signal 842 to a stage before the loop filter unit 820. For example, the previous stage may include a configuration disposed in a previous position of the configuration in the circuit configuration.

In addition, the signal converter 840 may convert the output current signal into a digital code based on a ratio of the current signal output from the current buffer and the fed back digital current signal.

In addition, the signal converter 840 may convert any one of a delta-sigma analog-to-digital converter and a delta-sigma digital-to-analog converter. It may include.

For example, the signal converter 840 may increase the quantization noise corresponding to the output current 814 of the current buffer to convert the output current 814 of the current buffer into a digital code with reduced noise.

In addition, the signal converter 840 may perform oversampling, noise shaping, digital filtering, and decimation of the output current 814 of the current buffer.

In addition, the signal converter 840 may convert the current signal and the current signal output from the current buffer and determine the bit density of the digital code through the charge balance of the fed back digital current signal 842. For example, the bit density may include the magnitude of the information of the current signal output from the current buffer.

For example, the signal converter 840 may convert the current signal output from the current buffer into a digital code, and calculate the bit density of the converted digital code based on Equation 2 below.

 [Equation 2]

According to Equation 2, μ may represent the bit density of the digital code, I _out may represent the output current 814 of the current buffer, and I _DAC may represent the digital current signal 842 output from the signal converter. Can be represented.

According to an embodiment of the present invention, the signal converter 840 predicts a signal value for the output current 814 of the current buffer, calculates an error, and corrects the error by using the accumulated error, thereby providing a current buffer. The output current 814 can be converted into a digital code.

According to another embodiment of the present invention, the apparatus for converting the output of the current buffer into a digital code may further include a loop filter unit 820 and a digital integrator 830.

The loop filter unit 820 may include a structure of a low pass filter (LPF). The loop filter unit 820 may accumulate and discharge charges controlled by a charge pump in a capacitor arranged in parallel.

Here, the charge pump includes a circuit configuration for adjusting the charge corresponding to the output current of the current buffer. The charge pump can adjust the amount of charge by the difference of the differential signal. The charge pump also sets the reference voltage, Since the voltage is increased or decreased in accordance with the difference between the two signals, the branch operation can be performed.

That is, the loop filter unit 820 may adjust the amount of charge for the output current of the current buffer and transfer it to the next stage.

The digital integrator 830 may convert the increment representing the increase or decrease of the signal into a digital signal.

That is, the digital integrator 830 may convert the charge amount to the output current of the current buffer by the loop filter unit 820 and then convert the digital integrator into a digital signal based on the increase of the adjusted charge.

9A and 9B show block diagrams of current buffers in accordance with one embodiment of the present invention.

Specifically, FIG. 9A illustrates components of a current buffer that senses a common signal at an output terminal of the current buffer and then feeds back the sensed common signal to output a differential signal from which the common signal has been removed based on the fed back common signal. do. Next, FIG. 9B illustrates components of a current buffer that senses a common signal at an input of the current buffer and outputs a differential signal from which the common signal has been removed.

Referring to FIG. 9A, the current buffer 900 may include a circuit configuration connected to the common signal feedback unit 910 to exchange feedback signals. In addition, the current buffer unit (not shown) may include a current buffer 900 and the common signal feedback unit 910. For example, the feedback signal may comprise a common signal and the common signal may comprise a common current signal.

According to another embodiment, the current buffer 900 may include a common signal feedback unit 910. That is, the current buffer 900 may include a common signal feedback unit 910 therein. For example, the common signal feedback unit 910 may transmit a feedback signal to control the common signal in the signal output from the current buffer 900.

The current buffer 900 receives a first input signal 920 including a first current signal 926 and a common current signal 924 through an input terminal, and the second current signal 928 and the common current signal 924. The second input signal 922 including) may be received through the input terminal.

Next, the current buffer 900 converts the first input signal 920 into a current signal and outputs it, and converts the second input signal 922 into another current signal and outputs it. Here, the current signal converted from the first input signal 920 and the second input signal 922 may include a common current signal 924.

Next, the common signal feedback unit 910 connected to the current buffer 900 may detect the common current signal 924 at the output terminal of the current buffer 900.

According to an embodiment of the present invention, the joint signal feedback unit 910 may include a joint signal detector (not shown).

The common signal detector may detect the common current signal 924 at the output terminal of the current buffer 900.

Next, the common signal feedback unit 910 may feed back a common mode feedback signal with respect to the common current signal 924. For example, the cavity mode feedback signal may include a cavity current signal 924.

The current buffer 900 outputs the first current signal 926 excluding the common current signal 924 from the first input signal 920 based on the fed back common mode feedback signal, and the second input signal 922. The second current signal 928 from which the common current signal 924 is excluded may be output from the second current signal 928.

Referring to FIG. 9B, the current buffer 930 may include a circuit configuration connected to the common signal feedback unit 940 to exchange a feedback signal. In addition, the current buffer unit (not shown) may include a current buffer 930 and the common signal feedback unit 940. For example, the feedback signal may comprise a common signal and the common signal may comprise a common current signal.

According to another embodiment, the current buffer 930 may include a common signal feedback unit 940. That is, the current buffer 930 may include a common signal feedback unit 940 therein.

The current buffer 930 receives a first input signal 950 including a first current signal 956 and a common current signal 954 through an input terminal, and the second current signal 958 and the common current signal 954. The second input signal 952 including) may be received through the input terminal.

Next, the current buffer 930 converts and outputs the first input signal 950 to the first current signal 956, and converts and outputs the second input signal 952 to the second current signal 958. Can be. Here, the current signal converted from the first input signal 950 and the second input signal 952 may include a common current signal 954.

Next, the common signal feedback unit 940 connected to the current buffer 930 may detect the common current signal 954 at an input terminal of the current buffer 930.

According to an embodiment of the present invention, the joint signal feedback unit 940 may include a joint signal detector (not shown).

The common signal detector may detect the common current signal 954 at an input of the current buffer 930.

Next, the common signal feedback unit 940 may feed back the common mode feedback signal with respect to the common current signal 954. For example, the cavity mode feedback signal may include a cavity current signal 954.

The current buffer 930 outputs a first current signal 956 excluding the common current signal 954 from the first input signal 950 based on the fed back common mode feedback signal, and the second input signal 952. The second current signal 958 excluding the common current signal 954 may be output from.

That is, the current buffer 930 receives the common mode feedback signal through the common signal feedback unit 940 before converting the first input signal 950 into the first current signal 956 and outputs the common mode feedback signal. Based on the signal, a signal in which the common signal 954 is excluded from the first input signal 950 may be output as the first current signal 956.

In addition, the current buffer 930 receives the common mode feedback signal through the common signal feedback unit 940 before converting the second input signal 952 into the second current signal 958 and outputs the common mode feedback signal. Based on the signal, a signal in which the common signal 954 is excluded from the second input signal 952 may be output as the second current signal 958.

10 illustrates a flowchart relating to a method of converting the output of a current buffer into a digital code in accordance with one embodiment of the present invention.

Specifically, FIG. 10 is a view illustrating an operation of converting an output of a current buffer into a digital code according to an embodiment of the present invention and converting the current signal output from the current buffer into a digital code through a signal converter. Illustrate the flow chart for this.

Referring to FIG. 10, in step 1001, a method of converting an output of a current buffer into a digital code converts an input signal into a current signal and outputs the converted current signal. The method of converting the output of the current buffer into a digital code receives an input signal corresponding to a touch input sensed by the capacitive touch sensor in the user interface through an input terminal of the current buffer, and converts the received input signal into a current signal. Can be. Here, the current signal may exclude a common signal and may include a differential signal including a first signal and a second signal. For example, the method of converting the output of the current buffer into a digital code may amplify and modulate the input signal and convert it into a current signal. For example, the input signal may include a current conveyor signal transmitted by mirroring the touch input signal sensed by the capacitive touch sensor through the current conveyor. For example, the current signal output from the current buffer may be a differential signal from which the common signal is removed.

In step 1003, the method of converting the output of the current buffer into a digital code converts the current signal into a digital current signal and feeds it back. That is, the method of converting the output of the current buffer into a digital code transmits the output current of the current buffer to the signal converter, converts the current signal into a digital current signal, and then converts the converted digital current signal into a current buffer. After being positioned between the loop filter units and transferred to the signal synthesizing unit, the signal synthesizing unit may synthesize the current signal and the digital current signal. Here, the synthesized current signal and the digital current signal may be synthesized at a predetermined ratio.

In operation 1005, the method of converting the output of the current buffer into a digital code may convert the current signal into a digital code based on a ratio of the current signal and the digital current signal. That is, the method of converting the output of the current buffer into a digital code divides the bit corresponding to the current signal by the bit corresponding to the fed back digital current signal to determine the bit density of the digital code, and outputs the digital code corresponding to the determined bit density. can do.

Figure 11 shows a block diagram associated with the operation of converting the output of the current buffer into a digital code in accordance with one embodiment of the present invention.

In detail, FIG. 11 is a device for converting an output of a current buffer into a digital code according to an embodiment of the present invention to determine a charge balance, and through the SRAM 1150 to sense a digital code changed through the determined charge balance through a sense amplifier ( 140) illustrates a circuit configuration to be output afterwards.

Referring to FIG. 11, a first loop filter unit 1110, a first integrator 1120, a signal converter 1130, and a first sink among components of an apparatus for converting an output of a current buffer into a digital code may be described. sinc) Filter 1140, SRAM 1150, second loop filter 1112, second integrator 1122, signal converter 1132, and second sync filter 1142, static random access memory ) 1152.

Receives a current signal through the first loop filter unit 1110 and the second loop filter unit 1112 and integrates the signal input through the first loop filter unit 1110 and the second loop filter unit 1112. The operation may be performed and the generated signal may be generated through the first integrator 1120 and the second integrator 1122.

The first bit signal generated through the first integrator 1120 is converted into a first digital current signal through the first signal converter 1130 and then a signal synthesis part of the front end of the first loop filter 1110. The second bit signal fed back and generated through the second integrator 1122 is converted into the second digital current signal through the second signal converter 1132, and then the signal at the front end of the second loop filter 1112. It can be fed back to the composite part. For example, the front end may include a previously located portion of the configuration on the circuit.

Next, the first loop filter 1110 synthesizes the current signal and the first digital current signal, and the first integrator 1120 calculates the charge balance between the synthesized current signal and the first digital current signal, and calculates The first digital code converted into the first digital code based on the charge balance may be pulse-shaped and transferred to the SRAM 1150.

In addition, the second loop filter 1112 synthesizes the current signal and the second digital current signal, and the second integrator 1122 calculates a charge balance between the synthesized current signal and the second digital current signal, and calculates the calculated charge. Based on the balance, the second digital code converted into the second digital code may be pulse-shaped and transferred to the SRAM 1152.

The converted first digital code and the second digital code may be output after being processed by the sensing amplifier 140.

12 is a block diagram associated with the operation of converting the output of the current buffer into a digital code in accordance with one embodiment of the present invention.

Specifically, FIG. 12 is a configuration in which an apparatus for converting an output of a current buffer into a digital code according to an embodiment of the present invention feeds back a common mode feedback signal through a common signal feedback unit to output a differential signal from which a common signal is removed; The related circuit configuration is illustrated.

The apparatus for converting the output of the current buffer into a digital code may include a signal amplifier 1210, a signal converter 1220, a common signal feedback unit 1230, and a dual current conveyor 1240.

The apparatus for converting the output of the current buffer into a digital code may transmit the common signal included in the current signal in the common signal feedback unit 1230 in the process of transferring the current signal from the dual current conveyor 1240 to the signal amplifier 1210. It can be detected.

Next, the apparatus for converting the output of the current buffer into a digital code transmits a common mode feedback signal corresponding to the sensed common signal to the dual current conveyor 1240, and transmits the differential signal from which the common signal is removed, the signal amplifying unit 1210. ) Can be delivered.

Next, in the apparatus for converting the output of the current buffer into a digital code, the differential signal transmitted to the signal amplifier 1210 may be converted into a digital current signal by the signal converter 1220.

In addition, the apparatus for converting the output of the current buffer into a digital code may transmit the converted digital current signal to the transmission unit (f _DRV ), the current signal and the digital current signal to the signal amplifier 1210.

Next, the device for converting the output of the current buffer into a digital code may be output by modulating and amplifying the current signal and the digital current signal into a voltage signal in the signal amplifier 1210. For example, the signal amplifier 1210 may include a chopper that alternately contacts the capacitor.

13 is a block diagram of a sensor input sensing device according to an embodiment of the present invention.

Specifically, FIG. 13 illustrates components of a sensor input sensing device according to an embodiment of the present invention.

Referring to FIG. 13, the sensor input sensing device 1300 includes a first sensor node 1310, a second sensor node 1320, and a subtraction unit 1330.

Hereinafter, in the present specification, the 'sensor' may be, for example, a 'touch sensor', and the touch sensor will be described as an example. Accordingly, the 'sensor input' may be referred to as a 'touch input', and the 'sensor event' may also be referred to as a 'touch event'.

In addition, the 'sensor' may be, for example, a 'fingerprint detection sensor'. Therefore, the sensor input sensing device according to an embodiment of the present invention may be applied as a circuit for recognizing the coordinates of the touch panel or as a circuit for fingerprint detection.

For example, when a panel includes a touch panel and a large area fingerprint sensing panel, the touch voltage and the fingerprint sensing may be simultaneously performed by a single integrated circuit by controlling the driving voltage of the sensor input sensing device.

According to an embodiment of the present invention, the first sensor node 1310 may include a first current conveyor and receive a reference signal related to a sensor input. For example, the reference signal may include an adjacent channel signal and a baseline signal.

In addition, according to an embodiment of the present invention, the first sensor node 1310 may include an adjacent channel node.

In addition, according to an embodiment of the present invention, the first sensor node 1310 may current-copy the received reference signal using the first current conveyor.

In addition, according to an embodiment of the present invention, the first sensor node 1310 blocks the generation of the first parasitic capacitor for the reference signal transmitted from the first sensor node to the subtraction unit 1330 through the first current conveyor. The first parasitic capacitor and the amplifier may be separated.

In addition, according to an embodiment of the present invention, the first sensor node 1310 may receive a reference signal associated with at least one of current, charge, and capacitor input.

In addition, according to an embodiment of the present invention, the first sensor node 1310 may include a sensor channel positioned adjacent to the second sensor node 1320 at the sensor interface.

In addition, according to an embodiment of the present invention, the first sensor node 1310 may receive a reference signal related to a sensor input and output a reference signal as a first signal using a first current conveyor.

In addition, when amplifying the reference signal using the first current conveyor, the first sensor node 1310 may perform current copying and signal amplification on the reference signal to include different current gains between the multiple signals.

According to another exemplary embodiment, when the first sensor node 1310 detects a sensor input at a position corresponding to the first sensor node 1310 in the touch sensor interface, a reference signal related to the sensor input using the first current conveyor is detected. And sensor input signals can be combined.

According to an embodiment of the present invention, the second sensor node 1320 may include a second current conveyor.

In addition, when a touch event occurs in the touch sensor interface, the second sensor node 1320 may receive a reference signal and a sensor input signal related to the sensor input. Here, the reference signal may include a reference signal received by the first sensor node 1310 and the second sensor node 1320. That is, the first sensor node 1310 and the second sensor node 1320 may receive a reference signal for detecting a sensor input.

In addition, the second sensor node 1320 may current-copy the reference signal and the sensor input signal using the second current conveyor.

In addition, the second sensor node 1320 blocks the generation of the second parasitic capacitor for the reference signal and the sensor input signal transmitted from the second sensor node 1320 to the subtraction unit through the second current conveyor and the second parasitic capacitor and the second parasitic capacitor. The amplifier can be separated.

In addition, the second sensor node 1320 blocks the generation of the second parasitic capacitor for the reference signal and the sensor input signal transmitted from the second sensor node 1320 to the subtraction unit through the second current conveyor and the second parasitic capacitor and the second parasitic capacitor. The amplifier can be separated.

In addition, the second sensor node 1320 may receive a reference signal associated with at least one of a current, a charge, and a capacitor input.

In addition, the second sensor node 1320 may include a sensor node on which a sensor input event is generated on the touch sensor interface.

In addition, when the second sensor node 1320 outputs multiple signals by amplifying at least one of the reference signal and the sensor input signal using the second current conveyor, the second sensor node 1320 includes different reference current gains between the multiple signals. And at least one of the sensor input signal and the current copy and signal amplification.

Also, the second sensor node 1320 receives a sensor input signal and a reference signal related to the sensor input, and outputs a second signal in which the sensor input signal and the reference signal related to the sensor input are combined using the second current conveyor. Can be.

In addition, the second sensor node 1320 performs current copy on at least one of the reference signal and the sensor input signal using the second current conveyor to output at least one of the reference signal and the sensor input signal as multiple signals. can do.

That is, the second sensor node 1320 may current-copy at least one of the input signals into a plurality of signals using the second current conveyor. Here, the second sensor node 1320 may amplify and output a plurality of signals at a specific ratio.

According to an embodiment of the present invention, the subtraction unit 1330 may receive the first signal copied from the first current conveyor from the first sensor node 1310. Here, the first signal may include a reference signal.

According to an embodiment of the present invention, the subtraction unit 1330 may receive a second signal copied from the second current conveyor from the second sensor node 1320. Here, the second signal may include a reference signal and a sensor input signal. Also, the second signal may include a signal in which the reference signal and the sensor input signal are combined.

According to an embodiment of the present invention, the subtractor 1330 may receive a reference received from the first sensor node 1310 from a second signal in which the reference signal received from the second sensor node 1320 and the received sensor input signal are combined. The first signal including the signal may be subtracted to output only the sensor input signal. Here, the sensor input signal may include a current, a charge, a capacitor input, and the like corresponding to the sensor input signal.

According to another embodiment of the present invention, the sensor input sensing device 1300 may include an amplifier 1340.

The amplifier 1340 may receive a current related to a sensor input signal output through the subtractor 1330, amplify the received current, and output the voltage.

In addition, the amplifier 1340 may be disconnected from the parasitic capacitor through the first current conveyor and the second current conveyor.

14A is a block diagram of a circuit configuration of a sensor input sensing device according to an embodiment of the present invention.

Specifically, FIG. 14A illustrates circuit components for processing a current signal by a sensor input sensing device according to an embodiment of the present invention.

Referring to FIG. 14A, circuit components include a first sensor node 1410, a second sensor node 1412, a subtraction unit 1420, and an amplifier 1430.

The first sensor node 1410 may include a first current signal receiver (not shown), a first capacitor (not shown), a first current bias unit (not shown), and a first current conveyor (not shown).

The first current signal receiver may receive a current signal corresponding to the reference signal.

In addition, the first capacitor may store and emit the current signal received from the first current signal receiver.

In addition, the first current bias unit may supply a first bias signal for supporting the operation of the transistor included in the first current conveyor.

In addition, the first current conveyor may receive current through the first current signal receiver and radiate a current corresponding to a reference signal that may be emitted from the first capacitor.

The second sensor node 1412 may include a second current signal receiver (not shown), a second capacitor (not shown), a second current bias unit (not shown), and a second current conveyor (not shown).

The second current signal receiver may receive a current signal corresponding to the reference signal and a current signal corresponding to the sensor input signal. For example, the second current signal receiver may receive a current signal corresponding to a sensor input signal corresponding to a sensor input event at the touch sensor interface of the sensor input sensing device.

In addition, the second capacitor may store and emit the current signal received from the second current signal receiver. The current signal received from the second current signal receiver may include a current signal corresponding to the reference signal and a current signal corresponding to the sensor input signal.

In addition, the second current bias unit may supply a second bias signal for supporting the operation of the transistor included in the second current conveyor.

In addition, the second current conveyor may be received through the second current signal receiver and radiate a current corresponding to a reference signal that may be emitted from the second capacitor and a current corresponding to the sensor input signal.

The subtraction unit 1420 may combine the current signals received from the first sensor node 1410 and the second sensor node 1412. That is, the subtraction unit 1420 outputs only a current corresponding to the sensor input signal by excluding the first current signal received from the first sensor node 1410 from the second current signal received from the second sensor node 1412. can do.

In addition, the amplifier 1430 may receive a current related to a sensor input signal output through the subtractor 1420, amplify the received current, and output the voltage.

14B is a block diagram of a circuit configuration of a sensor input sensing device according to an embodiment of the present invention.

Specifically, FIG. 14B illustrates circuit components for the sensor input sensing device to process the capacitor input signal according to an embodiment of the present invention.

Referring to FIG. 14B, the circuit components may include the capacitor input unit 1440, the first sensor node 1450, the second sensor node 1452, the subtraction unit 1460, the chopper driver 1470, and the amplifier 1480. Include.

The capacitor input unit 1440 may input a capacitor input related to the sensor input to the sensor input sensing device. In addition, the capacitor input unit 1440 may input a constant voltage related to the capacitor input related to the sensor input to the sensor input sensing device. In addition, the capacitor input unit 1440 may input a pulse signal corresponding to the reference signal and a pulse signal corresponding to the sensor input signal.

The first sensor node 1450 may include a first capacitor input receiver (not shown), a first capacitor (not shown), a first current bias unit (not shown), and a first current conveyor (not shown).

The first capacitor input receiver may receive a capacitor input signal corresponding to the reference signal and output a current signal corresponding to the received capacitor input signal.

Also, the first capacitor may store and emit a current signal received from the first capacitor input receiver.

In addition, the first current bias unit may supply a first bias signal for supporting the operation of the transistor included in the first current conveyor.

In addition, the first current conveyor may receive a current through the first capacitor input receiver and radiate a current corresponding to a reference signal that may be emitted from the first capacitor.

The second sensor node 1452 may include a second current signal receiver (not shown), a second capacitor (not shown), a second current bias unit (not shown), and a second current conveyor (not shown).

The second capacitor input receiver may receive a capacitor input signal corresponding to the reference signal and a capacitor input signal corresponding to the sensor input signal, and output a current signal corresponding to the received capacitor input signal.

In addition, the second capacitor may store and emit a current signal received from the second capacitor input receiver.

In addition, the second current bias unit may supply a second bias signal for supporting the operation of the transistor included in the second current conveyor.

In addition, the second current conveyor may be received through the second capacitor input receiver and radiate a current corresponding to at least one of the reference signal and the sensor input signal that may be emitted from the first capacitor.

The subtraction unit 1460 may combine the current signals received from the first sensor node 1450 and the second sensor node 1452. That is, the subtraction unit 1460 outputs only a current corresponding to the sensor input signal by excluding the first current signal received from the first sensor node 1450 from the second current signal received from the second sensor node 1452. can do.

The chopper driver 1470 may remove signal noise and offset voltages of the first current conveyor and the second current conveyor. In addition, the chopper driver 1470 may drive a chopper to convert a DC signal corresponding to the current output from the subtraction unit 1460 into an AC signal.

The amplifier 1480 may receive a current related to a sensor input signal output through the chopper driver 1470, amplify the received current, and output the voltage.

15 is a flowchart illustrating a sensor input sensing method using a current conveyor according to an embodiment of the present invention.

In detail, FIG. 15 illustrates a method for detecting a sensor input according to an embodiment of the present invention, in which a touch event is generated in a capacitive touch sensor interface using a current conveyor, at least among current, charge, and capacitor inputs corresponding to the touch event. It illustrates an operation for detecting any one or more.

Referring to FIG. 15, in step 1501, the sensor input sensing method may receive a reference signal at a first sensor node and output a first signal through a first current conveyor.

That is, the sensor input sensing method may receive a reference signal related to the sensor input by using the first current conveyor, and output the received reference signal as a first signal.

In addition, the sensor input sensing method may receive a reference signal continuously transmitted on the touch sensor interface using the first current conveyor, and output the received reference signal as a first signal.

In addition, the sensor input sensing method may receive a reference signal associated with at least one of a current, a charge, and a capacitor input at the first sensor node.

For example, the first sensor node may include a sensor channel located adjacent to the second sensor node at the sensor interface.

In addition, the sensor input sensing method may output the first signal as multiple signals by performing a current copy of the reference signal using the first current conveyor.

Next, in step 1502, a reference signal and a sensor input signal may be received at the second sensor node, and a second signal combined with the reference signal and the sensor input signal may be output.

That is, the sensor input detection method receives a reference signal and a sensor input signal related to the sensor input by using a second current conveyor when a touch event occurs in the sensor interface, and combines the reference signal and the sensor input signal related to the sensor input. 2 signals can be output.

In addition, the sensor input sensing method may receive a sensor input signal associated with at least one of a current, a charge, and a capacitor input at the second sensor node.

In operation 1503, the sensor input sensing method outputs only the sensor input signal by subtracting the first signal from the second signal.

That is, in the sensor input sensing method, the subtraction unit subtracts a first signal including a reference signal received by the first sensor node from a reference signal received at the second sensor node and a second signal combined with the sensor input signal. Only sensor input signal can be output.

Figure 16a shows a block diagram associated with the circuit configuration of the current conveyor according to an embodiment of the present invention.

Specifically, FIG. 16A illustrates circuit components in which a current conveyor according to an embodiment of the present invention outputs multiple currents by copying one input current.

Referring to FIG. 16A, the current conveyor 1600 may receive an input 1610, copy a current received from the input 1610, amplify the copied current at a specific magnification, and output the multiple currents.

That is, the current conveyor 1600 copies the input 1610 using a current mirror, and then amplifies N times the copied input 1610 to output the first output 1620, the second output 1622, and the third. An output 1624 and a fourth output 1626. Here, the current amount of the first output 1620 and the current amount of the second output 1622 may be different from each other. That is, the first output 1620 and the second output 1622 having different amounts of current may be output through the current conveyor 1600.

In addition, the current conveyor 1600 may perform current copy on the input 1610 and output the multiple signals. Here, the output multiple signals may perform current copy and signal amplification on the reference signal to include different current gains.

In addition, the configuration of outputting the multiple currents shown in FIG. 16A may be applied to each sensor node.

For example, when the configuration of FIG. 16A is applied to the first sensor node 1410 of FIG. 14A, the first sensor node 1410 uses two mirrored reference signals I _B1-1 and I _B1 using current mirroring. Can print _-2

Similarly, the second sensor node 1412 can output two mirrored signals, I _B2-1 + I _S and I _B2-2 + I _S. Here, I _S corresponds to the sensor input signal.

In this case, I _B1-1 , I _B1-2 , I _B2-1, and I _B2-2 are reference signals having only the same value, except that only the sensor nodes that are output are different.

Although not shown in FIG. 14A, a second sensor node 1412 may be next provided with a third sensor node, and the third sensor node also uses two current signals, I _B3-1 and I _B3 , using current mirroring. Can print _-2

In this case, the adjacent channel signal of I _B2-1 + I _S is I _B1-2 , which is the second reference signal output from the first sensor node, and the adjacent channel signal of I _B2-2 + I _S is output from the third sensor node. The first reference signal is I _B3-1 .

In other words, it included in the I _B2-1 + I _S I _{B2- 1} may be removed by I _B1-2 the reference signal outputted from the adjacent channel.

Similarly, the I _{B2-2 B2-2} containing the I + I _S can be removed by the I _B3-1 the reference signal outputted from the adjacent channel.

As such, when two multiple outputs are configured in one sensor node, output signals between adjacent channels can be completed in one cycle, thereby improving the response speed of the entire panel.

Figure 16b shows a block diagram associated with the circuit configuration of the current conveyor according to an embodiment of the present invention.

Specifically, FIG. 16B illustrates circuit components for current conveyor according to one embodiment of the present invention to output multiple currents by copying one input and to drive different processes using multiple currents.

Referring to FIG. 16B, the current conveyor 1600 receives an input 1630, copies the received input 1630 with current, amplifies the copied current at a specific magnification and outputs a plurality of currents to process a plurality of processes. Can handle them.

That is, the current conveyor 1600 copies the input 1630 using a current mirror, and then amplifies N times the copied input 1630 to output currents having different amounts of current, and thus, the first process 1640. , Second process 1644, third process 1644, and fourth process 1646.

For example, the current conveyor 1600 copies a first process 1640 consuming a current corresponding to 10 mA and a second process 1642 consuming a current corresponding to 20 mA using a current mirror, and then copies. N times the input 1630 can be amplified and driven with different currents.

17 is a block diagram related to a circuit configuration for sensing a sensor input by a sensor input sensing device according to an embodiment of the present invention.

Specifically, FIG. 17 is a view illustrating an operation of sensing a sensor input signal corresponding to a sensor input event when a sensor input event occurs in a touch sensor interface using multiple current conveyors, according to an embodiment of the present invention; The related circuit configuration is illustrated.

Referring to FIG. 17, the sensor input sensing device includes a signal receiver 1710, a current conveyor unit 1720, a common signal feedback unit 1730, a chopper driver 1740, and an amplifier 1750.

According to an embodiment of the present invention, the signal receiver 1710 may receive current signals.

The current conveyor unit 1720 of the present invention may detect the current signals received through the signal receiver 1710.

For example, the current conveyor unit 1720 receives a current by a current mirror for sensing a current signal of the first transistor M ₁ having a specific size and a current magnitude of the first transistor M ₁ . It may include an auxiliary feedback amplifier that mirrors the transistor M ₂ .

In addition, the current conveyor unit 1720 may change the gate and drain voltages of the second transistor M ₂ in the same manner.

In addition, the current conveyor unit 1720 may remove the reference signal based on the reference signal fed back through the common signal feedback unit 1730.

In addition, the current conveyor unit 1720 may include a first conveyor unit and a second conveyor unit, and the current received through the first conveyor unit may be subtracted from the current received through the second conveyor unit.

According to an embodiment of the present invention, the common signal feedback unit 1730 may detect a reference signal at an output terminal of the current conveyor unit 1720. Here, the reference signal may be a signal that is jointly included among the currents output from the first current conveyor unit and the second current conveyor unit included in the current conveyor unit 1720.

According to an embodiment of the present invention, the chopper driver 1740 may remove noise and offset voltage from the output of the current conveyor unit 1720. In addition, the chopper driver 1740 may limit the resolution of the integrator with respect to the current.

According to an embodiment of the present invention, the amplifier 1750 may divide the current using a chopper to mitigate noise and offset voltage.

In addition, the amplifier 1750 may modulate and amplify the current signal and the digital current signal into a voltage signal and output the same. For example, the amplifier 1750 may include a chopper that alternately contacts the capacitor.

The amplifier included in the amplifying unit 1480 or the amplifying unit 1750 may be operated as an integrator by the chopper driver 1470 illustrated in FIG. 14B and the chopper included in the amplifying unit 1750 of FIG. 17. For example, the signal input to the amplifier by the chopper is accumulated, thereby reducing noise and increasing the sensitivity of the sensed signal.

In the above-described specific embodiments, the components included in the invention are expressed in the singular or plural according to the specific embodiments presented.

However, the singular or plural expressions are selected to suit the circumstances presented for convenience of description, and the above-described embodiments are not limited to the singular or plural elements, and the singular or plural elements may be formed of the singular or However, even a component expressed in the singular may be configured in plural.

Meanwhile, in the description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the technical idea included in the various embodiments.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

Claims (15)

A first sensor node outputting a reference signal as a first current signal using the first current conveyor; A second sensor node configured to output a second current signal in which the reference signal and the sensor input signal are combined by using a second current conveyor; A subtraction unit configured to subtract the output first current signal from the output second current signal and output the sensor input signal as a third current signal; And Converting the output third current signal into a digital current signal to feed back the converted digital current signal, and based on a ratio of the output third current signal and the fed back digital current signal, the output third current signal Signal conversion unit for converting the digital code Device that recognizes touch input and fingerprint input. The method of claim 1, The second sensor node, Receiving the sensor input signal and the reference signal including at least one of a touch input and a fingerprint input, and outputting the second current signal by combining the received sensor input signal and the received reference signal Device that recognizes touch input and fingerprint input. The method of claim 1, The first sensor node, And a sensor channel positioned adjacent to the second sensor node at a sensor interface that recognizes either a touch input or a fingerprint input. Device that recognizes touch input and fingerprint input. The method of claim 1, The second sensor node, A current copy is performed on at least one of the reference signal and the sensor input signal using the second current conveyor to output at least one of the reference signal and the sensor input signal as multiple signals. Device that recognizes touch input and fingerprint input. The method of claim 1, The first sensor node and the second sensor node, Receiving the reference signal associated with at least one of current, charge, and capacitor input converted from an input voltage Device that recognizes touch input and fingerprint input. The method of claim 1, The second sensor node, Receiving the sensor input signal associated with at least one of a current, a charge, and a capacitor input converted from an input voltage Device that recognizes touch input and fingerprint input. The method of claim 1, The signal converter, A delta-sigma analog-to-digital converter and a delta-sigma digital-to-analog converter Device that recognizes touch input and fingerprint input. The method of claim 1, The signal converter, Determining a bit density of the digital code through charge balancing of the output third current signal and the fed back digital current signal Device that recognizes touch input and fingerprint input. The method of claim 8, The signal converter, The bit density is calculated by dividing a bit corresponding to the output third current signal by a bit corresponding to the fed back digital current signal. Device that recognizes touch input and fingerprint input. At the first sensor node, outputting a reference signal as a first current signal using the first current conveyor; Outputting, at a second sensor node, a second current signal in which the reference signal and the sensor input signal are combined using a second current conveyor; In the subtraction unit, subtracting the output first current signal from the output second current signal and outputting the sensor input signal as a third current signal; And The signal converting unit converts the output third current signal into a digital current signal to feed back the converted digital current signal, and outputs the output based on a ratio of the output third current signal and the fed back digital current signal. Converting the third current signal into a digital code How to recognize touch input and fingerprint input. The method of claim 10, The outputting of the second current signal may include: The second sensor node receives the sensor input signal and the reference signal including at least one of a touch input and a fingerprint input, and combines the received sensor input signal and the received reference signal to provide the second current. Outputting a signal How to recognize touch input and fingerprint input. The method of claim 10, The outputting of the first current signal may include: Receiving the reference signal associated with at least one of current, charge, and capacitor input converted from a first input voltage; How to recognize touch input and fingerprint input. The method of claim 10, The outputting of the second current signal may include: Receiving the reference signal associated with at least one of current, charge, and capacitor input converted from a second input voltage; And Receiving the sensor input signal associated with at least one of current, charge, and capacitor input converted from the second input voltage; How to recognize touch input and fingerprint input. The method of claim 10, Converting to the digital code, Determining, by the signal converter, a bit density of the digital code through charge balancing of the output third current signal and the fed back digital current signal; How to recognize touch input and fingerprint input. The method of claim 14, Determining a bit density of the digital code, Calculating the bit density by dividing a bit corresponding to the output third current signal by a bit corresponding to the fed back digital current signal; How to recognize touch input and fingerprint input.

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