KR20200075464A - Electronic apparatus for controlling touch sensing - Google Patents

Abstract

The present invention relates to an electronic device for controlling touch sensing to improve the sensing precision of a touch or hovering input to a touch screen panel and reduce a chip size. According to various embodiments, an electronic device comprises: a touch screen panel including at least one sensing electrode; a compensation circuit including a first current path connected to the touch screen panel through a sensing node and providing a first compensation current based on a reference current to the sensing node, and a second current path based on the reference current and providing a second compensation current having a phase different from that of the first compensation current to the sensing node; and at least one control circuit providing a driving signal to the at least one sensing electrode and controlling to output a sensing signal from the at least one sensing electrode, wherein the at least one control circuit may control to output the sensing signal compensated by the first or second compensation current while the first or second compensation current is being provided to the sensing node. In addition, other embodiments are possible.

Description

ELECTRONIC APPARATUS FOR CONTROLLING TOUCH SENSING}

Various embodiments relate to an electronic device that controls touch sensing.

A touch screen panel (TSP) is an input device that senses the contact or hovering position of an object such as a user's hand or a touch pen and transmits a user's command. The touch screen panel may be provided on the front surface of the display device or may be integrated with the display device.

Resistive, SAW (surface acoustic wave), infrared (IR), optical or capacitive methods are known as touch screen panel touch sensing methods. In particular, the capacitive method may convert a touch position into an electrical signal based on the capacitance formed by an object such as a user's hand or a touch pen and a conductive electrode of the touch screen panel.

In recent years, capacitive touch screen panels are mainly used in that the quality of the display is small and the thickness can be reduced. Since the touch screen panel is widely used in a mobile device, there is a need to develop a technology capable of more stably detecting a touch input in a noise environment. That is, in order to improve the sensitivity of the signal in the touch screen panel, effective noise removal is required.

According to various embodiments, it is possible to provide an electronic device for controlling touch sensing that can improve a sensing precision of a touch or hovering input to a touch screen panel and reduce chip size.

According to various embodiments of the present disclosure, in an electronic device, a touch screen panel including one or more sensing electrodes, a touch screen panel and a sensing node, and providing a first compensation current based on a reference current to the sensing node A compensation circuit including a first current path and a second current path based on the reference current and providing a second compensation current different in phase from the first compensation current to the sensing node and a driving signal to the one or more sensing electrodes And at least one control circuit for controlling to output a sensing signal from the one or more sensing electrodes, wherein the at least one control circuit is provided while the first or second compensation current is provided to the sensing node. , It is possible to control so that a sensing signal compensated by the first or second compensation current is output.

An electronic device that controls touch sensing according to various embodiments provides a compensation circuit based on current driving that can reduce the complexity of the circuit, power consumption, and the processing range of the base capacitance to compensate for the offset capacitance of the touch screen panel And, through the operation of controlling the sensing signal outputted from the sensing electrode of the touch screen panel and the compensation by the compensation circuit to be performed simultaneously, while minimizing chip size and effectively removing noise, touch or hovering on the touch screen panel It is possible to improve the sensing accuracy of the input.

1 is a block diagram of an electronic device in a network environment for controlling touch sensing, according to various embodiments.
2 is a block diagram of a display device for controlling touch sensing according to various embodiments.
3 is a block diagram schematically illustrating a touch screen panel and a touch control circuit according to various embodiments.
4 is a block diagram schematically illustrating a touch screen panel and a touch control circuit according to various embodiments.
5 is a block diagram illustrating a touch control circuit according to various embodiments.
6 is a diagram for describing a touch control circuit according to various embodiments.
7 is a circuit diagram schematically illustrating a compensation circuit according to various embodiments.
8 is a circuit diagram illustrating a compensation circuit according to various embodiments.
9 is a circuit diagram illustrating a first current path of a compensation circuit according to various embodiments.
10 is a circuit diagram illustrating a second current path of a compensation circuit according to various embodiments.
11 is a time flowchart for describing an operation of a touch control circuit according to various embodiments.

1 is a block diagram of an electronic device 101 in a network environment 100 according to various embodiments. Referring to FIG. 1, in the network environment 100, the electronic device 101 communicates with the electronic device 102 through the first network 198 (eg, a short-range wireless communication network), or the second network 199. It may communicate with the electronic device 104 or the server 108 through (for example, a remote wireless communication network). According to an embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108. According to one embodiment, the electronic device 101 includes a processor 120, a memory 130, an input device 150, an audio output device 155, a display device 160, an audio module 170, a sensor module ( 176), interface 177, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196, or antenna module 197 ). In some embodiments, at least one of the components (for example, the display device 160 or the camera module 180) may be omitted or one or more other components may be added to the electronic device 101. In some embodiments, some of these components may be implemented as one integrated circuit. For example, the sensor module 176 (eg, a fingerprint sensor, an iris sensor, or an illuminance sensor) may be implemented while being embedded in the display device 160 (eg, a display).

The processor 120 executes software (eg, the program 140) to execute at least one other component (eg, hardware or software component) of the electronic device 101 connected to the processor 120, for example. It can be controlled and can perform various data processing or operations. According to one embodiment, as at least part of data processing or computation, the processor 120 may receive instructions or data received from other components (eg, the sensor module 176 or the communication module 190) in the volatile memory 132. Loaded into, process instructions or data stored in volatile memory 132, and store result data in non-volatile memory 134. According to one embodiment, the processor 120 includes a main processor 121 (eg, a central processing unit or an application processor), and an auxiliary processor 123 (eg, a graphics processing unit, an image signal processor) that can be operated independently or together. , Sensor hub processor, or communication processor). Additionally or alternatively, the coprocessor 123 may be set to use less power than the main processor 121, or to be specialized for a designated function. The coprocessor 123 may be implemented separately from the main processor 121 or as part of it.

The coprocessor 123 may replace, for example, the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 may be active (eg, execute an application) ) With the main processor 121 while in the state, at least one component of the components of the electronic device 101 (eg, the display device 160, the sensor module 176, or the communication module 190) It can control at least some of the functions or states associated with. According to one embodiment, the coprocessor 123 (eg, image signal processor or communication processor) may be implemented as part of other functionally relevant components (eg, camera module 180 or communication module 190). have.

The memory 130 may store various data used by at least one component of the electronic device 101 (eg, the processor 120 or the sensor module 176). The data may include, for example, software (eg, the program 140) and input data or output data for commands related thereto. The memory 130 may include a volatile memory 132 or a non-volatile memory 134.

The program 140 may be stored as software in the memory 130, and may include, for example, an operating system 142, middleware 144, or an application 146.

The input device 150 may receive commands or data to be used for components (eg, the processor 120) of the electronic device 101 from outside (eg, a user) of the electronic device 101. The input device 150 may include, for example, a microphone, mouse, keyboard, or digital pen (eg, a stylus pen).

The audio output device 155 may output an audio signal to the outside of the electronic device 101. The audio output device 155 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback, and the receiver can be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from, or as part of, a speaker.

The display device 160 may visually provide information to the outside of the electronic device 101 (for example, a user). The display device 160 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device. According to an embodiment, the display device 160 may include a touch circuitry configured to sense a touch, or a sensor circuit (eg, a pressure sensor) configured to measure the strength of the force generated by the touch. have.

The audio module 170 may convert sound into an electrical signal, or vice versa. According to an embodiment, the audio module 170 acquires sound through the input device 150, or an external electronic device connected directly or wirelessly to the sound output device 155 or the electronic device 101 (for example, Sound may be output through the electronic device 102) (eg, speakers or headphones).

The sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101 or an external environmental state (eg, a user state), and generates an electrical signal or data value corresponding to the detected state can do. According to one embodiment, the sensor module 176 includes, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biological sensor, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.

The interface 177 may support one or more designated protocols that can be used for the electronic device 101 to directly or wirelessly connect to an external electronic device (eg, the electronic device 102). According to an embodiment, the interface 177 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal 178 may include a connector through which the electronic device 101 can be physically connected to an external electronic device (eg, the electronic device 102 ). According to an embodiment, the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 179 may convert electrical signals into mechanical stimuli (eg, vibration or movement) or electrical stimuli that the user can perceive through tactile or motor sensations. According to one embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 180 may capture still images and videos. According to one embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 188 may manage power supplied to the electronic device 101. According to one embodiment, the power management module 388 may be implemented, for example, as at least part of a power management integrated circuit (PMIC).

The battery 189 may supply power to at least one component of the electronic device 101. According to one embodiment, the battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

The communication module 190 may be a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, the electronic device 102, the electronic device 104, or the server 108). It can support establishing and performing communication through the established communication channel. The communication module 190 is operated independently of the processor 120 (eg, an application processor) and may include one or more communication processors supporting direct (eg, wired) communication or wireless communication. According to one embodiment, the communication module 190 is a wireless communication module 192 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg : Local area network (LAN) communication module, or power line communication module. Corresponding communication module among these communication modules includes a first network 198 (eg, a short-range communication network such as Bluetooth, Wi-Fi direct, or infrared data association (IrDA)) or a second network 199 (eg, a cellular network, the Internet) Or, it may communicate with an external electronic device through a computer network (eg, a telecommunication network such as LAN or WAN). These various types of communication modules may be integrated into a single component (eg, a single chip), or may be implemented as a plurality of separate components (eg, multiple chips). The wireless communication module 192 uses a subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 within a communication network such as the first network 198 or the second network 199. The electronic device 101 can be verified and authenticated.

The antenna module 197 may transmit a signal or power to the outside (eg, an external electronic device) or receive it from the outside. According to one embodiment, the antenna module 197 may include a single antenna including a conductor formed on a substrate (eg, a PCB) or a radiator made of a conductive pattern. According to an embodiment, the antenna module 197 may include a plurality of antennas. In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network 198 or the second network 199, is transmitted from the plurality of antennas by, for example, the communication module 190. Can be selected. The signal or power may be transmitted or received between the communication module 190 and an external electronic device through the selected at least one antenna. According to some embodiments, other components (eg, RFIC) other than the radiator may be additionally formed as part of the antenna module 197.

At least some of the components are connected to each other through a communication method between peripheral devices (for example, a bus, a general purpose input and output (GPIO), a serial peripheral interface (SPI), or a mobile industry processor interface (MIPI)). Ex: command or data) can be exchanged with each other.

According to an embodiment, the command or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199. Each of the electronic devices 102 and 104 may be the same or a different type of device from the electronic device 101. According to an embodiment, all or some of the operations performed on the electronic device 101 may be performed on one or more external devices of the external electronic devices 102, 104, or 108. For example, when the electronic device 101 needs to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device 101 executes the function or service itself. In addition or in addition, one or more external electronic devices may be requested to perform at least a portion of the function or the service. The one or more external electronic devices receiving the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and deliver the result of the execution to the electronic device 101. The electronic device 101 may process the result, as it is or additionally, and provide it as at least part of a response to the request. To this end, for example, cloud computing, distributed computing, or client-server computing technology can be used.

2 is a block diagram 200 of a display device 160 according to various embodiments. Referring to FIG. 2, the display device 160 may include a display 210 and a display driver IC (DDI) 230 for controlling the display 210. The DDI 230 may include an interface module 231, a memory 233 (eg, a buffer memory), an image processing module 235, or a mapping module 237. The DDI 230 receives, for example, image data or image information including an image control signal corresponding to a command for controlling the image data from the other components of the electronic device 101 through the interface module 231. can do. For example, according to an embodiment, the image information may include a processor 120 (eg, the main processor 121 (eg, an application processor) or an auxiliary processor 123 operated independently of the functions of the main processor 121 ( Example: a graphic processing device) DDI 230 may communicate with the touch circuit 250 or the sensor module 176 through the interface module 231. In addition, the DDI 230 may At least a portion of the received image information may be stored in the memory 233, for example, in units of frames.The image processing module 235 may, for example, store at least a portion of the image data as a characteristic of the image data, or Pre-processing or post-processing (eg, resolution, brightness, or resizing) may be performed based on at least the characteristics of the display 210. The mapping module 237 is pre-processed or post-processed through the image processing module 135. A voltage value or a current value corresponding to the image data may be generated.According to an embodiment, the generation of a voltage value or a current value may include, for example, properties of pixels of the display 210 (eg, an array of pixels ( RGB stripe or pentile structure), or the size of each of the sub-pixels) At least some pixels of the display 210 are, for example, based at least in part on the voltage value or the current value. By being driven, visual information (eg, text, images, or icons) corresponding to the image data may be displayed through the display 210.

According to an embodiment, the display device 160 may further include a touch circuit 250. The touch circuit 250 may include a touch sensor 251 and a touch sensor IC 253 for controlling the touch sensor 251. The touch sensor IC 253 may control the touch sensor 251 to detect, for example, a touch input or a hovering input for a specific location of the display 210. For example, the touch sensor IC 253 may sense a touch input or a hovering input by measuring a change in a signal (eg, voltage, light amount, resistance, or charge amount) for a specific location of the display 210. The touch sensor IC 253 may provide information about the sensed touch input or hovering input (eg, location, area, pressure, or time) to the processor 120. According to an embodiment, at least a part of the touch circuit 250 (eg, the touch sensor IC 253) is disposed as part of the display driver IC 230, or the display 210, or outside the display device 160. It may be included as part of other components (eg, coprocessor 123).

According to an embodiment, the display device 160 may further include at least one sensor (eg, a fingerprint sensor, an iris sensor, a pressure sensor, or an illuminance sensor) of the sensor module 176, or a control circuit therefor. In this case, the at least one sensor or a control circuit therefor may be embedded in a part of the display device 160 (eg, the display 210 or DDI 230) or a part of the touch circuit 250. For example, when the sensor module 176 embedded in the display device 160 includes a biometric sensor (eg, a fingerprint sensor), the biometric sensor may be associated with biometric information through a partial area of the display 210. (Eg fingerprint image) can be acquired. For another example, when the sensor module 176 embedded in the display device 160 includes a pressure sensor, the pressure sensor may acquire pressure information associated with a touch input through a partial or entire area of the display 210. Can. According to an embodiment, the touch sensor 251 or the sensor module 176 may be disposed between pixels of a pixel layer of the display 210 or above or below the pixel layer.

3 is a block diagram 300 schematically illustrating a touch screen panel and a touch control circuit according to various embodiments.

Referring to FIG. 3, an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments includes a touch screen panel 310 (eg, the touch sensor 251 of FIG. 2) and a touch control circuit 320 ) (Eg, the touch sensor IC 253 of FIG. 2 ).

The touch screen panel 310 may generate a sensing signal corresponding to the touch input in response to the touch input, and provide the generated sensing signal to the touch control circuit 320. The touch screen panel 310 may include one or more sensing electrodes 311. According to various embodiments, the one or more sensing electrodes 311 may be arranged in the form of a dot matrix. The touch screen panel 310 in which the sensing electrode 311 is disposed in the form of a dot matrix may be used in a self capacitance sensing method of measuring a capacitance between the sensing electrode 311 and ground. In addition, the touch screen panel 310 in which the sensing electrode 311 is disposed in the form of a dot matrix can be implemented as a single indium tin oxide (ITO) layer, simplifying the manufacturing process of the touch screen panel and reducing the thickness of the display panel. have. In one embodiment, the touch screen panel 310 may be implemented with an on cell touch active matrix organic light-emitting diode (AMOLED), in which case the sensing electrode 311 may be deposited directly on the AMOLED display. have. In another embodiment, the touch screen panel 310 may be implemented as a Y-OCTA (youm-on cell touch active matrix organic light-emitting diode (AMOLED), in which case the sensing electrode 311 is on the flexible AMOLED display. It may be deposited directly In another example, the touch screen panel 310 may be deposited inside the display panel.

The touch control circuit 320 may detect whether a touch input is generated in the touch screen panel 310 and a location where the touch input is applied. According to various embodiments, the touch control circuit 320 may sense a touch input using a self-capacitance sensing method. For example, the touch control circuit 320 provides a driving signal to one or more sensing electrodes 311, and uses a self-capacitance sensing method based on a sensing signal output from the one or more sensing electrodes to provide a touch screen panel ( 310) may be detected.

4 is a block diagram 400 schematically illustrating a touch screen panel and a touch control circuit according to various embodiments.

Referring to FIG. 4, an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments includes a touch screen panel 410 (eg, the touch sensor 251 of FIG. 2) and a touch control circuit 420 ) (Eg, the touch sensor IC 253 of FIG. 2 ).

The touch screen panel 410 may include one or more sensing electrodes 411. For example, one or more sensing electrodes 411 may be connected to adjacent sensing electrodes in the first direction to form a first sensing line 412. For example, the first sensing lines 412 may be arranged in a horizontal direction to form a plurality of first channels R1, R2, R3, ... Rn. In addition, one or more sensing electrodes 411 may be connected to sensing electrodes adjacent to each other in a second direction to cross the first sensing line 412 to form a second sensing line 413. For example, the second sensing line 413 may form a plurality of second channels C1, C2, C3, ... Cm arranged in the vertical direction. According to various embodiments, the plurality of first channels R1, R2, R3, ... Rn and the plurality of second channels C1, C2, C3, ... Cm are arranged in a two-dimensional matrix form Can be. In one embodiment, the plurality of first channels R1, R2, R3, ... Rn and the plurality of second channels C1, C2, C3, ... Cm may be formed in different layers. have. In one embodiment, the plurality of first channels R1, R2, R3, ... Rn and the plurality of second channels C1, C2, C3, ... Cm may be formed on the same layer. . The touch screen panel 410 on which the sensing electrodes 411 are disposed in the form of a two-dimensional matrix is self-capacitance sensing that measures the capacitance between the first sensing line 412 or the second sensing line 413 and the ground independently of each other. Can be used in a manner. Alternatively, the touch screen panel 410 in which the sensing electrode 411 is disposed in a two-dimensional matrix form senses mutual capacitance to measure the capacitance between the first sensing line 412 and the second sensing line 413. Can be used in a manner. In one embodiment, the touch screen panel 410 may be implemented with an on cell touch active matrix organic light-emitting diode (AMOLED), in which case the sensing electrode 411 may be deposited directly on the AMOLED display. have. In another embodiment, the touch screen panel 410 may be implemented as a Y-OCTA (youm-on cell touch active matrix organic light-emitting diode (AMOLED), in which case the sensing electrode 411 is on the flexible AMOLED display. It may be deposited directly In another example, the touch screen panel 410 may be deposited inside the display panel.

The touch control circuit 420 may detect whether a touch input has occurred on the touch screen panel 410 and a location where the touch input is applied. According to various embodiments, the touch control circuit 420 may sense a touch input using a self-capacitance sensing method or a mutual capacitance sensing method. For example, the touch control circuit 420 provides driving signals independently of each other to the first sensing line 412 or the second sensing line 413 composed of one or more sensing electrodes 411, and the first sensing line 412 ) Or a touch or hovering input to the touch screen panel 410 may be detected using a self-capacitance sensing method based on sensing signals output independently from each other from the second sensing line 413. Alternatively, the touch control circuit 420 provides a driving signal to the first sensing line 412 and uses a mutual capacitive sensing method based on the sensing signal output from the second sensing line 413 to touch the touch screen panel. A touch or hovering input to 410 may be detected. In one embodiment, the touch control circuit 420 may detect a touch or hovering input by alternately applying a self-capacitance sensing method and a mutual capacitance sensing method.

5 is a block diagram 500 illustrating a touch control circuit according to various embodiments.

Referring to FIG. 5, the touch control circuit 520 according to various embodiments (eg, the touch sensor IC 253 of FIG. 2, the touch control circuit 310 of FIG. 3, or the touch control circuit 420 of FIG. 4) May include at least one of an H/W accelerator 521, a memory 523, an MCU 522, a bus 524, or an analog front end (AFE) 530. The analog front end 530 may include at least one of a driving circuit 531, a compensation circuit 532, or a sensing circuit 533.

The analog front end 530 may be output from, for example, a driving circuit 531 that provides an encoded driving signal to one or more sensing electrodes 311 included in the display panel 310, and one or more sensing electrodes 311. A compensation circuit 532 for removing the base capacitance from the sensing signal or a sensing circuit 533 for converting the sensing signal output from the one or more sensing electrodes 311 into a proportional sensing voltage and processing the converted signal into a digital signal. It is possible to combine at least one of them into a single stage block. The analog front end 530 may transmit the processed digital signal to the H/W accelerator 521 through a bus 524.

The H/W accelerator 521 is used instead of firmware to process digital signals at high speed, and may perform coordinate interpolation or basic correction.

The MCU 522 may control the entire operation of the touch control circuit 520 and may process a touch or hovering input to the touch screen panel 310. In one embodiment, processing of a touch or hovering input to the touch screen panel 310, for example, coordinate interpolation or basic correction, may be performed on at least one of the H/W accelerator 521 or the MCU 522.

The memory 523 may include, for example, at least one of data SRAM (data SRAM) or flash memory. The memory 523 may store at least one of codes or parameters for control. For example, the memory 523 may store at least one of a set register value of the analog front end 530, raw data of a sensing signal, or reference data. In FIG. 5, one or more sensing electrodes 311 of the touch screen panel 310 are illustrated in a dot matrix form, but these are merely exemplary, and one or more sensing electrodes, such as the touch screen panel 410 illustrated in FIG. 4 411 constitutes the first sensing line 412 and the second sensing line 413 and may be arranged in a two-dimensional matrix form.

6 is a diagram 600 for describing a touch control circuit according to various embodiments.

Referring to FIG. 6, a touch control circuit according to various embodiments (eg, a touch sensor IC 253 of FIG. 2, a touch control circuit 310 of FIG. 3, a touch control circuit 420 of FIG. 4) or The touch control circuit 520 of 5 may include a driving circuit 610, a compensation circuit 620, and a sensing circuit 630.

The driving circuit 610 generates a driving signal, an encoding drive 612 encoding the generated driving signal, and one or more sensing electrodes of the touch screen panel 310 using the driving signal encoded by the encoding drive 612 ( A first switch array 613 selectively connected to 611 and a second switch array 614 for outputting a sensing signal from the one or more sensing electrodes 611 may be included.

The encoding driver 612 may encode a driving signal to provide a first driving signal having a first code and a second driving signal having a second code different in phase from the first code. For example, the encoding drive 612 may impart a pseudo-random (PR) code having random characteristics and orthogonality to the driving signal.

The first switch array 613 may selectively connect a driving signal encoded by the encoding drive 612 to one or more sensing electrodes 611. When a driving signal is applied to the sensing electrode 611 connected by the first switch array 613, a self capacitance (C _SC ) is formed between the ground and the charging electrode 611 to be charged. Can. At this time, when a user's body, for example, a finger or an object is touched or hovered at a position corresponding to the sensing electrode 311, a human body capacitance (C _HB ) between the user's body and the touch screen panel 310 ) May be further formed.

The second switch array 614 selectively connects one or more sensing electrodes 611 charged with self capacitance (C _SC ) or human body capacitance (C _HB ) to the sensing node 640. Can. When the sensing electrode 611 is connected to the sensing node by the second switch array 614, a sensing signal corresponding to the self capacitance (C _SC ) charged in the sensing electrode 611 or the self-capacitance A sensing signal corresponding to the summation of (C _SC ) and human body capacitance (C _HB ) may be output. That is, since the magnitude of the capacitance of the sensing signal output from the sensing electrode 611 changes depending on whether the user touches or hovers, the sensing circuit 630 measures the change in the signal size of the received sensing signal to measure the touch screen panel. A user's touch or hovering input to 310 may be sensed.

The sensing circuit 630 converts a sensing signal output from the sensing electrode 611 to a sensing voltage through a sensing node 640 connected to one or more sensing electrodes 611 to output a charge amplifier (CA) 631 ), correlated double sampler (CDS) 632 that filters noise by sampling the sensing voltage output from the charge amplifier 631, and converts the signal filtered by the correlated double sampler 632 into a digital signal. It may include an analog-to-digital converter (ADC) 633, and a decoding driver 634 that decodes the digital signal and outputs it as digital data.

The charge amplifier 631 includes an amplifier 631a having a first input terminal connected to the sensing node 640 and a second input terminal to which a reference voltage is applied, and converts the sensing signal to a sensing voltage and outputs it. In addition, the charge amplifier 631 is a feedback capacitor 631b connected between a first input terminal of the amplifier 631a and an output terminal outputting a sensing voltage and an initialization switch (initializing the feedback capacitor 631b) 631c).

Meanwhile, in addition to the signals transmitted by the self-capacitance (C _SC ) and the body capacitance (C _HB ), the sensing signal output to the sensing circuit 630 may include various noises such as signals generated from the display. In addition, as the thickness of the display becomes thinner, the basic capacitance value of the self-capacitance may be increased. For example, when the touch screen panel 310 is implemented with a Y-OCTA (youm-on cell touch active matrix organic light-emitting diode (AMOLED)), a basic capacitance value of self-capacitance may have 500 µs or more. . As described above, the processing range of the self-capacitance is widened by the thinning of the display, and even in a situation in which a sensing signal containing noise is detected, the processing range of the self-capacitance can be reduced and the noise component is effectively It is necessary to design a touch control circuit to remove and improve the signal-to-noise ratio (SNR).

The compensation circuit 620 according to various embodiments is connected to a sensing signal output from one or more sensing electrodes 611 through a sensing node 640 between the driving circuit 610 and the sensing circuit 630. It can be configured to compensate for offset capacitance based on current driving.

7 is a circuit diagram 700 schematically illustrating a compensation circuit according to various embodiments.

Referring to FIG. 7, the compensation circuit 620 according to various embodiments may compensate for offset capacitance based on current driving. The compensation circuit 620 is connected through the touch screen panel 310 and the sensing node 640 and provides a first compensation current 712 based on the reference current to the sensing node 640, the first current path 710 And a second current path 720 based on the reference current and providing a second compensation current 722 that is out of phase with the first compensation current 712 to the sensing node 640. For example, the first compensation current 712 includes a sink current through which charge flows from the sensing node 640 to the compensation circuit 620, and the second compensation current 722 is the compensation The circuit 620 may include a source current through which charge flows to the sensing node 640.

According to various embodiments, the compensation circuit 620 provides a first or second compensation current to the sensing node 640 and switches to connect between the first current path 710 and the second current path 720 Circuit 730 may be included. The switching circuit 730 includes a first switch 711 connecting the first current path 710 to the sensing node 640 and a second switch 721 connecting the second current path 720 to the sensing node 640. ), while the third switch 730 connecting between the first current path 710 and the second current path 720 and the first current path 710 and the second current path 720 are connected, the A sampling capacitor 740 may be included to sample one compensation current, that is, a sink current, as a second compensation current, that is, a source current reference voltage.

The first switch 711 may connect the first current path 710 to the sensing node 640. When the first current path 710 is connected to the sensing node 640 by the first switch 711, the sensing node 640 receives the first compensation current 712 based on the reference current from the first current path 710. Can be provided on. For example, the first compensation current 712 may include a sink current through which charge flows from the sensing node 640 to the compensation circuit 620. The first switch 711 is connected to the first current path 710 and the sensing node 640 while the first driving signal having the first sign (+) is provided from the driving circuit 610, and the sensing node 640 ) To provide a sink current through which charge flows to the compensation circuit 620. As the sink current flows from the sensing node 640, the capacitance 750 of the first driving signal with the first sign (+) output from the sensing electrode 611 is compensated, and the capacitance 760 of the compensated sensing signal May be provided to the sensing circuit 630.

The second switch 721 may connect the second current path 720 to the sensing node 640. When the second current path 720 is connected to the sensing node 640 by the second switch 711, the second current path 710 receives the second compensation current 722 based on the reference current from the sensing node 640. ). For example, the second compensation current 722 may include a source current through which charge flows from the compensation circuit 620 to the sensing node 640. The second switch 721 senses the second current path 720 while the second driving signal having the second sign (-) different from the first sign (+) in the driving circuit 610 is provided. The node 640 may be connected to provide a source current through which charge flows from the compensation circuit 620 to the sensing node 640. As the source current flows toward the sensing node 640, the capacitance 750 of the second driving signal with the second sign (-) output from the sensing electrode 611 is compensated, and the capacitance 760 of the compensated sensing signal May be provided to the sensing circuit 630.

The third switch 730 may connect between the first current path 710 and the second current path 720. The first current path 710 may generate a reference current based on the current supplied from the current source. While the first current path 710 and the second current path 720 are connected to each other by the third switch 730, the reference current generated by the first current path 710 is the second current path 720. To share. The second current path 720 may provide the second compensation current 722 to the sensing node 640 based on the reference current shared from the first current path 710.

While the sampling capacitor 740 is located in the second current path 720 and is connected between the first current path 710 and the second current path 720 by the third switch 730, the first current path ( The reference current shared from 710) can be charged by sampling with a proportional voltage.

According to various embodiments, the compensation circuit 620 may correct the mismatch between sink and source currents by allowing the first current path 710 and the second current path 720 to share the same reference current.

8 is a circuit diagram 800 illustrating a compensation circuit in accordance with various embodiments.

Referring to FIG. 8, the compensation circuit 620 according to various embodiments may include a plurality of first current paths 710 to share a reference current between the first current path 710 and the second current path 720. FETs (812a, 812b, 812c, 812d, 812e, 812f, 812g, 813a, 813b, 813c, 813d, 813e, 813f) and the amplifier 811, the second current path 720 includes a plurality of FET (822a) , 822b, 822c, 822d, 822e, 823a, 823b, 823c, 823d) and can be implemented with a regulated cascode current mirror circuit with a wide swing including amplifier 821 have. The compensation circuit 620 is implemented with a regulated cascode current mirror circuit having a wide swing, so that V _x and V _y on the second current path 720 are equal, resulting in a process change in the transistor and a drain voltage mismatch in the current mirror. All can be compensated.

The compensation circuit 620 according to various embodiments includes a first transistor M _P1 connected to both ends of a third switch 731 that connects between the first current path 710 and the second current path 720, and The second transistor M _P2 may be included. After the first transistor M _P1 and the second transistor M _P2 are disconnected between the first current path 710 and the second current path 720, the first current path 710 and the second current are disconnected. The offset remaining between the paths 720 can be removed. The first transistor M _P1 and the second transistor M _P2 may include PMOS transistors having different width/length ratios. May be, for example, the first transistors (M _P1) the width / length ratio of the second transistor (M _P2) the width / length ratio of the half (half) of the.

9 is a circuit diagram 900 for describing a first current path of a compensation circuit according to various embodiments.

Referring to FIG. 9, a reference current I _REF is applied to a source terminal of the FET 812f of the first current path 710 of the compensation circuit 620 according to various embodiments, and a gate terminal of the FET 812f A bias voltage V _bias may be applied to the. The negative (-) terminal of the amplifier 811 is grounded, and the positive (+) terminal of the amplifier 811 may be applied with a reference current (I _REF ) via the FET 812f. The output terminal of the amplifier 811 may be connected to the gate terminal of the FET (812g). Also, a shared current (I _copied ) corresponding to a reference current may be applied from the second current path 720 to the source terminal of the FET 812g. When the first switch 711 of the first current path 710 is connected to the sensing node 640, a sink current corresponding to the shared current I _copied is provided to the sensing node 640 You can. The plurality of FETs 812f, 812g, 813e, and 813f of the first current path 710 and the amplifier 811 are connected in a feedback structure so that V _DS1 and V _DS2 can have the same voltage value. A mismatch between the first current path 710 and the second current path 720 may be corrected.

10 is a circuit diagram 1000 for describing a second current path of a compensation circuit according to various embodiments.

Referring to FIG. 10, a second current path 720 of the compensation circuit 620 according to various embodiments has a reference current from the first current path 710 connected to the sampling capacitor 740 and a third switch 731 is connected. In the meantime, it can be converted into a proportional voltage and sampled. The voltage sampled to the sampling capacitor 740 may be applied as the gate voltage V _{gs of} the FET 823d, which is a shared current (I _copied ) corresponding to the reference current through the drain terminal of the FET 823d. (822e). When the second switch 721 of the second current path 720 is connected to the sensing node 640, a source current corresponding to the shared current I _copied is provided to the sensing node 640 Can.

The second current path 720 according to various embodiments is connected to one end and the other end of the third switch 731 and remains after the connection between the first current path 710 and the second current path 720 is terminated. It may include a first transistor (M _P1 ) And a second transistor (M _P2 ) for removing the offset. The first transistor M _P1 and the second transistor M _P2 may include PMOS transistors having different width/length ratios. For example, the width/length ratio of the first transistor M _P1 is 5/0.35 μm, and the width/length ratio of the second transistor M _P2 is 10/0.35 μm, which is the width of the first transistor M _P1 . The length ratio may be half of the width/length ratio of the second transistor M _P2 . When the first transistor M _P1 and the second transistor M _{P2 are} connected between the first current path 710 and the second current path 720, when the connection of the third switch 731 is released, the first transistor M _P1 is disconnected. The channel charge of the two transistors M _P2 is trapped in the first transistor M _P1 to remove the residual offset.

11 is a time flow chart 1100 for describing the operation of the touch control circuit according to various embodiments.

Referring to FIG. 11, a touch control circuit according to various embodiments (eg, a touch sensor IC 253 of FIG. 2, a touch control circuit 310 of FIG. 3, a touch control circuit 420 of FIG. 4) or FIG. When the operation of the touch control circuit 520 of 5 is described on the basis of the length of time that the sensing signal is output from the charge amplifier 631 of the sensing circuit 630, the sensing signal of the first code is output. A period 1110 and a second period 1120 in which the sensing signal of the second code is output may be included. The operation of the touch control circuit during the first period 1110 and the second period 1120 provides a first compensation current 712 in the first current path 710 and a second in the second current path 720. Except for providing the compensation current 722, since it may be performed in a substantially similar operation, in the following, the compensation circuit 620 compensates for the source current through the second current path 720, the second period 1120 Based on the description, the touch sensing control operation will be described.

In the first time period 1121, the first switch array (S _CHG ) 613 may be controlled to provide the driving signal of the driving circuit 610 to the sensing electrode 611. The driving signal from the driving circuit 610 may be charged to the sensing electrode 611 by the first switch array 613.

In the second time period 1122, the driving signal charged in the sensing electrode 611 is a sensing signal, and the second switch array (S _DHG ) 614 is provided to the sensing circuit 630 from the sensing electrode 611. Can be controlled. The sensing signal may be discharged from the sensing electrode 611 by the first switch array 614.

In addition, in the first time period 1121, the initialization switch S _RST 631c is controlled to initialize the feedback capacitor 631b so that the charge amplifier 631 of the sensing circuit 630 can receive the sensing signal. Can. The feedback capacitor 631c of the charge amplifier 631 can be initialized by the initialization switch 631c.

According to various embodiments, a third time period 1123 may be included between the first time period 1121 and the second time period 1122.

In the first time period 1121, the third switch 731 of the compensation circuit 620 is controlled to connect between the first current path 710 and the second current path 720 of the compensation circuit 620. Can. A reference between the first current path 710 and the second current path 720 by connecting the first current path 710 and the second current path 720 by a third switch (S _CAL ) 731 The current can be shared. The operation of sharing the reference current may correct a mismatch between the sink current and the source current before compensating the sink current or source current by the compensation circuit 620.

In the third time period 1123, the second switch (S _SRC ) 721 of the compensation circuit 620 is controlled to connect the second current path 720 of the compensation circuit 620 to the sensing node 640. can do. The second current path 720 and the sensing node 640 may be connected by the second switch 721 to provide the source current to the sensing node 640 in the second current path 720.

According to various embodiments, the operation of sharing a reference current between the first current path 710 and the second current path 720 in the first time period 1121 is performed in the third time period 1123. The third switch 731 may be controlled for a time (Tcal) that may overlap at least partially with the operation of providing the source current to the sensing node 640. This makes it possible to prevent the deviation of the current from occurring by partially overlapping the compensation operation of the reference current and the operation of providing the source current.

According to various embodiments, the operation of providing the source current in the third time period to the sensing node 640 may include at least a portion of discharging the sensing signal from the sensing electrode 611 in the second time period. The second switch array 614 may be controlled to be redundant. This is because when the provision of the source current and the discharge of the sensing signal are simultaneously performed, it may be difficult to accurately measure the movement of the excessive capacitance from the sensing electrode. Therefore, the operation of providing the source current is performed by first sensing and discharging the sensing signal The sensing signal may be compensated by maintaining the signal during the discharge operation.

The electronic device according to various embodiments (eg, the electronic device 101 of FIG. 1) includes one or more sensing electrodes (eg, the sensing electrode 311 of FIG. 3, the sensing electrode 411 of FIG. 4, and the sensing of FIG. 5) A touch screen panel including an electrode 311 or the sensing electrode 611 of FIG. 6 (eg, the touch screen panel 310 of FIG. 3, the touch screen panel 410 of FIG. 4, or the touch screen panel of FIG. 5) 310), and the touch screen panel and a sensing node (for example, the sensing node 640 of FIG. 6 or the sensing node 640 of FIG. 7 ), the sensing node based on a first compensation current based on a reference current Based on the first current path (e.g., the first current path 710 of FIG. 7, the first current path 710 of FIG. 8 or the first current path 710 of FIG. 9) and the reference current A second current path (eg, second current path 720 of FIG. 7, second current path 720 of FIG. 8) or a second current path that provides a second compensation current that is out of phase with the first compensation current to the sensing node. Compensation circuit (compensation circuit 532 of FIG. 5), compensation circuit 620 of FIG. 6, compensation circuit 620 of FIG. 7 or compensation circuit 620 of FIG. 8 including the second current path 720 of 10 )) and at least one control circuit (eg, a touch sensor IC 253 of FIG. 2, 3 of FIG. 2) that provides a driving signal to the one or more sensing electrodes and controls to output a sensing signal from the one or more sensing electrodes. And a touch control circuit 310, a touch control circuit 420 of FIG. 4, or a touch control circuit 520 of FIG. 5, wherein the at least one control circuit has the first or second compensation current sensing. While being provided to the node, the sensing signal compensated by the first or second compensation current may be controlled to be output.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the first compensation current includes a sink current through which charge flows from the sensing node to the compensation circuit. The second compensation current may include a source current through which charge flows from the compensation circuit to the sensing node.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the at least one control circuit may be configured to perform the first operation signal while a first driving signal having a first code of the driving signal is provided. While providing a first compensation current to the sensing node and a second driving signal having a second sign that is out of phase with the first sign of the driving signal is provided, the second compensation current is controlled to be provided to the sensing node. Can.

In an electronic device according to various embodiments (for example, the electronic device 101 of FIG. 1), the compensation circuit includes a regulated cascode current mirror circuit having a wide swing. can do.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the compensation circuit may include a first switch connecting the first current path to the sensing node (eg, the first of FIG. 7) Switch 711 or the first switch 711 in FIG. 8, a second switch connecting the second current path to the sensing node (eg, the second switch 721 in FIG. 7 or the second switch in FIG. 8) (721)), a third switch for connecting between the first and second current paths (eg, the third switch 730 of FIG. 7 or the third switch 730 of FIG. 8), and the first and first While the two current paths are connected, a sampling capacitor that samples the reference current (eg, the sampling capacitor 740 of FIG. 7, the sampling capacitor 740 of FIG. 8, or the sampling capacitor 740 of FIG. 10) ).

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, it is connected to one end and the other end of the third switch to remove residual offset between the first and second current paths. a first transistor a second transistor (Fig. 8, the first transistors (M _P1) or Fig. 10 the first transistors (M _P1) of a) and the second transistor (second transistor of FIG. 8 (M _P2) or 10 (M _P2 )).

In an electronic device according to various embodiments (eg, the electronic device 101 of FIG. 1 ), the first and second transistors may include PMOS transistors having different width/length ratios. .

In an electronic device according to various embodiments (eg, the electronic device 101 of FIG. 1 ), the width/length ratio of the first transistor may be half of the width/length ratio of the second transistor.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the first driving signal having the first code and the first code by generating the driving signal and encoding the generated driving signal A driving circuit (eg, the driving circuit 531 of FIG. 5 or the driving circuit 610 of FIG. 6) that provides a second driving signal having a second sign having a different phase from the second to the sensing electrode, and the at least one sensing A sensing circuit (eg, a sensing circuit 533 of FIG. 5) that converts the sensing signal output from an electrode to a sensing voltage and detects a touch or hovering input to the touch screen panel based on the converted sensing voltage. The sensing circuit 630 of 6 may be further included.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the sensing circuit includes an amplifier having a first input terminal connected to the sensing node and a second input terminal to which a reference voltage is applied ( Example: The amplifier 631a of FIG. 6 may be included, and a charge amplifier (CA) (eg, the charge amplifier 631 of FIG. 6) that converts and outputs the sensing signal to the sensing voltage may be included. .

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the charge amplifier includes a feedback capacitor connected between the first input terminal of the amplifier and an output terminal outputting the sensing voltage ( feedback capacitor) (eg, feedback capacitor 631b in FIG. 6), and an initialization switch (eg, initialization switch 631c in FIG. 6) for initializing the feedback capacitor.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, a first switch array (eg, FIG. 6) for providing the driving signal provided from the driving circuit to the one or more sensing electrodes The first switch array 613 of the first and the second switch array for outputting the sensing signal from the one or more sensing electrodes (eg, the second switch array 614 of FIG. 6) may be further included.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the at least one control circuit may include a first driving signal having a first sign of the driving signal or the second of the driving signal. While the second driving signal having the second code having a different phase from the first code is provided, in the first time period, the first switch array is controlled to charge the first or second driving signal to the one or more sensing electrodes. In the second time period, the first or second sensing signal corresponding to the first or second driving signal may be discharged from the one or more sensing electrodes by controlling the second switch array.

In the electronic device according to various embodiments (eg, the electronic device 101 of FIG. 1 ), the at least one control circuit controls the initialization switch of the charge amplifier in the first time period to charge the charge amplifier. Can reset the feedback capacitor.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, a third time interval between the first time interval and the second time interval, and the at least one control circuit , In the first time period, connecting between the first and second current paths of the compensation circuit to share the reference current between the first current path and the second current path, and in the third time period , By connecting the first or second current path and the sensing node, the first or second compensation current may be provided to the sensing node.

In the electronic device according to various embodiments (eg, the electronic device 101 of FIG. 1 ), the at least one control circuit may include the first current path and the second current path in the first time period. The operation of sharing the reference current may be controlled to overlap at least partially with the operation of providing the first or second compensation current to the sensing node in the third time period.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the at least one control circuit may transmit the first or second compensation current in the third time period to the sensing node. The provided operation may be controlled to overlap at least partially with the operation of discharging the sensing signal from the one or more sensing electrodes in the second time period.

In the electronic device according to various embodiments (eg, the electronic device 101 of FIG. 1 ), the driving circuit, the compensation circuit, the sensing circuit, or the at least one control circuit has one analog front end. ; AFE) circuits.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the one or more sensing electrodes included in the touch screen panel are disposed in a dot matrix form, and the at least one control circuit is Providing the driving signal to the one or more sensing electrodes, and using a self-capacitance sensing method based on a sensing signal output from the one or more sensing electrodes, inputs a touch or hover to the touch screen panel. Can be detected.

In an electronic device (eg, the electronic device 101 of FIG. 1) according to various embodiments, the one or more sensing electrodes included in the touch screen panel may include a first sensing line extending in a first direction (eg, FIG. 4) In the form of a two-dimensional matrix including a first sensing line (412) and a second sensing line (eg, the second sensing line 413 in FIG. 4) extending in a second direction to intersect with the first sensing line. Disposed, the at least one control circuit provides the driving signal independently of each other to the first sensing line or the second sensing line, and is output from the first sensing line and the second sensing line independently of each other. A touch or hovering input to the touch screen panel is detected by using a self capacitance sensing method based on a sensing signal, or the driving signal is provided to the first sensing line, and the second sensing line is used. A touch or hovering input to the touch screen panel may be detected using a mutual capacitance sensing method based on a sensing signal output from.

An electronic device according to various embodiments disclosed in this document may be a device of various types. The electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance device. The electronic device according to the embodiment of the present document is not limited to the above-described devices.

It should be understood that various embodiments of the document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, and include various modifications, equivalents, or substitutes of the embodiment. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A Each of the phrases such as "at least one of,, B, or C" may include any one of the items listed together in the corresponding phrase of the phrases, or all possible combinations thereof. Terms such as “first”, “second”, or “first” or “second” can be used to simply distinguish a component from other components, and to separate components from other aspects (eg, importance or Order). Any (eg, first) component is referred to as “coupled” or “connected” to another (eg, second) component, with or without the term “functionally” or “communically” When referred to, it means that any of the above components can be connected directly to the other components (eg by wire), wirelessly, or through a third component.

The term "module" used in this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic blocks, components, or circuits. The module may be an integrally configured component or a minimum unit of the component or a part thereof performing one or more functions. For example, according to an embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of the present disclosure may include one or more instructions stored in a storage medium (eg, internal memory 136 or external memory 138) readable by a machine (eg, electronic device 101). It may be implemented as software (e.g., program 140) that includes. For example, a processor (eg, processor 120) of a device (eg, electronic device 101) may call and execute at least one of one or more commands stored from a storage medium. This enables the device to be operated to perform at least one function according to the at least one command called. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The storage medium readable by the device may be provided in the form of a non-transitory storage medium. Here,'non-transitory' only means that the storage medium is a tangible device, and does not contain a signal (eg, electromagnetic waves), and this term is used when data is stored semi-permanently. It does not distinguish between temporary storage cases.

According to one embodiment, a method according to various embodiments disclosed in this document may be provided as being included in a computer program product. Computer program products can be traded between sellers and buyers as products. The computer program product is distributed in the form of a device-readable storage medium (eg compact disc read only memory (CD-ROM)), or through an application store (eg Play Store ^TM ) or two user devices ( For example, it can be distributed directly (e.g., downloaded or uploaded) between smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored at least temporarily in a storage medium readable by a device such as a memory of a manufacturer's server, an application store's server, or a relay server, or may be temporarily generated.

According to various embodiments, each component (eg, module or program) of the above-described components may include a singular or a plurality of entities. According to various embodiments, one or more components or operations of the above-described corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg, modules or programs) may be integrated into one component. In this case, the integrated component may perform one or more functions of each component of the plurality of components the same or similar to that performed by the corresponding component among the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order, or omitted Or, one or more other actions can be added.

310: touch screen panel 311: sensing electrode
320: touch control circuit

Claims (20)

In the electronic device,
A touch screen panel including one or more sensing electrodes;
It is connected through the touch screen panel and a sensing node,
A first current path providing a first compensation current based on a reference current to the sensing node, and
A compensation circuit including a second current path based on the reference current and providing a second compensation current that is out of phase with the first compensation current to the sensing node; And
And providing a driving signal to the one or more sensing electrodes, and controlling at least one control circuit to output a sensing signal from the one or more sensing electrodes,
The at least one control circuit,
An electronic device controlling to output a sensing signal compensated by the first or second compensation current while the first or second compensation current is provided to the sensing node.
According to claim 1,
The first compensation current includes a sink current through which charge flows from the sensing node to the compensation circuit,
The second compensation current is an electronic device including a source current through which charge flows from the compensation circuit to the sensing node.
According to claim 1,
The at least one control circuit,
While the first driving signal having the first sign of the driving signal is provided, the first compensation current is provided to the sensing node,
An electronic device that controls to provide the second compensation current to the sensing node while a second driving signal having a second code different in phase from the first code of the driving signal is provided.
According to claim 1,
The compensation circuit is an electronic device including a regulated cascode current mirror circuit having a wide swing.
According to claim 4,
The compensation circuit,
A first switch connecting the first current path to the sensing node;
A second switch connecting the second current path to the sensing node;
A third switch connecting between the first and second current paths; And
And a sampling capacitor sampling the reference current while being connected between the first and second current paths.
The method of claim 5,
An electronic device including a first transistor and a second transistor connected to one end and the other end of the third switch to remove residual offset between the first and second current paths.
The method of claim 6,
The first and second transistors include electronic devices having PMOS transistors having different width/length ratios.
The method of claim 7,
An electronic device in which the width/length ratio of the first transistor is half of the width/length ratio of the second transistor.
According to claim 1,
Generating the driving signal, and encoding the generated driving signal to provide a first driving signal having a first code and a second driving signal having a second code different from the first code to the one or more sensing electrodes Driving circuit; And
And a sensing circuit that converts the sensing signal output from the one or more sensing electrodes to a sensing voltage and senses a touch or hovering input to the touch screen panel based on the converted sensing voltage.
The method of claim 9,
The sensing circuit,
And an amplifier having a first input terminal connected to the sensing node and a second input terminal to which a reference voltage is applied, and a charge amplifier (CA) that converts and outputs the sensing signal to the sensing voltage. Device.
The method of claim 10,
The charge amplifier includes a feedback capacitor connected between the first input terminal of the amplifier and an output terminal outputting the sensing voltage, and
And an initialization switch for initializing the feedback capacitor.
The method of claim 11,
A first switch array for providing the driving signal provided from the driving circuit to the one or more sensing electrodes; And
And a second switch array for outputting the sensing signal from the one or more sensing electrodes.
The method of claim 12,
The at least one control circuit,
While a first driving signal having a first code of the driving signal or a second driving signal having a second code different in phase from the first code of the driving signal is provided,
In a first time period, the first switch array is controlled to charge the first or second driving signal to the one or more sensing electrodes,
In the second time period, the electronic device that discharges the first or second sensing signal corresponding to the first or second driving signal from the one or more sensing electrodes by controlling the second switch array.
The method of claim 13,
The at least one control circuit,
In the first time period, an electronic device that initializes a feedback capacitor of the charge amplifier by controlling the initialization switch of the charge amplifier.
The method of claim 14,
And a third time period between the first time period and the second time period,
The at least one control circuit,
In the first time period, the reference current is shared between the first current path and the second current path by connecting between the first and second current paths of the compensation circuit,
In the third time period, an electronic device that connects the first or second current path and the sensing node to provide the first or second compensation current to the sensing node.
The method of claim 15,
The at least one control circuit,
Sharing the reference current between the first current path and the second current path in the first time period provides the first or second compensation current to the sensing node in the third time period. And at least some overlapping electronic devices.
The method of claim 15,
The at least one control circuit,
Control so that the operation of providing the first or second compensation current to the sensing node in the third time period overlaps at least partially with the operation of discharging the sensing signal from the one or more sensing electrodes in the second time period. Electronic device.
The method of claim 9,
The driving circuit, the compensation circuit, the sensing circuit or the at least one control circuit is an electronic device that is integrated in one analog front end (analog front end) circuit.
According to claim 1,
The one or more sensing electrodes included in the touch screen panel are arranged in a dot matrix form,
The at least one control circuit,
Providing the driving signal to the one or more sensing electrodes, and using a self-capacitance sensing method based on a sensing signal output from the one or more sensing electrodes, inputs a touch or hover to the touch screen panel. Electronic device to detect.
According to claim 1,
The one or more sensing electrodes included in the touch screen panel are in a two-dimensional matrix form including a first sensing line extending in a first direction and a second sensing line extending in a second direction to intersect the first sensing line. Being deployed,
The at least one control circuit,
Self-capacitance based on sensing signals output from the first sensing line and the second sensing line independently of the driving signal is provided to the first sensing line or the second sensing line independently of each other. ) Using the sensing method, the touch or hovering input to the touch screen panel is detected, or
Providing the driving signal to the first sensing line, and using a mutual capacitance sensing method based on the sensing signal output from the second sensing line, the touch or hover input to the touch screen panel Electronic device to detect.

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