KR20210037931A - Method to compensate change of driving of pixel due to leakage current caused by lighting of sensor and electronic device applying the method - Google Patents

Abstract

Disclosed is an electronic device. The electronic device comprises: a housing including a first surface facing a first direction, a second surface facing a second direction opposite to the first direction, and a third surface connecting the first surface and the second surface and forming a space therein; a display viewed in the first direction through the first surface of the housing and configured to display a screen in the first direction using a plurality of pixels; a display driving circuit configured to provide a vertical synchronization signal and a light emission signal defining a first frame driven by the display to the display; a sensor disposed to overlap the screen in the second direction of the display and configured to emit light in the first direction; and a processor operatively connected to the display driving circuit and the sensor. The processor synchronizes the emission timing of the light so that the sensor emits the light when a gate voltage of a driving transistor of each of the plurality of pixels during the first frame is in a hold state, and the processor or the display driving circuit calculates a change amount of the gate voltage of the driving transistor during the first frame in accordance with the emission of the light. The display driving circuit compensates the gate voltage output from the display driving circuit by the change amount of the gate voltage to provide the same to the driving transistor. In addition to this, various embodiments identified through the specification are possible. Therefore, an occurrence of screen distortion in a part where the sensor is placed can be prevented.

Description

A method of compensating for a change in driving of a pixel due to a leakage current due to the emission of a sensor, and an electronic device to which the method is applied.

The embodiments disclosed in this document relate to a method of compensating for a driving change of a pixel according to a leakage current due to light emission from a sensor, and a technology for implementing an electronic device to which the method is applied.

The electronic device may display a screen through a display arranged to be viewed as a front side of a housing. A plurality of pixels for displaying a screen may be disposed on the display. The display may receive signals and voltages for displaying a screen from a display driver IC (DDI). Each of the plurality of pixels may receive a data voltage corresponding to a brightness and a color to be displayed in a current frame from the display driving circuit. A driving transistor of the pixel is driven with the data voltage supplied from the current frame, so that a light emitting device such as an organic light emitting diode (OLED) can emit light with a specified luminance. Specifically, the data voltage is supplied to the gate electrode of the driving transistor, and the brightness of the light emitting device driven by the driving transistor may be set based on a voltage difference between the source or drain electrode of the driving transistor and the gate electrode of the driving transistor.

Meanwhile, in the electronic device, a sensor for sensing an external state may be disposed on the front edge of the housing. For example, the electronic device may arrange a proximity sensor on the front edge of the housing to detect whether an external object approaches within a specified distance. The sensor can emit light to detect external conditions. For example, a proximity sensor emits light from an infrared light emitting diode (IR LED) to an external object, and calculates the distance between an electronic device and an external object using light reflected from an external object. can do.

Recently, as the size of the display increases, a bezel, which is a housing disposed to surround the edge of the display in the front of the electronic device, may be reduced or substantially removed. When the bezel is reduced or substantially removed, a sensor disposed at the front edge of the housing may be disposed inside the display. Accordingly, the sensor may be disposed on the rear surface of the display so as to overlap the pixels of the display in the thickness direction of the electronic device.

When the sensor overlaps the pixel of the display, light emitted from the sensor may change the gate voltage of the driving transistor of the pixel. Specifically, the diode-connected transistor connecting the gate terminal and the drain terminal of the driving transistor and the initialization transistor selectively connecting the gate terminal and the initialization voltage part of the driving transistor by the light emitted from the sensor are turned on. I can make it. When the diode-connected transistor and the initialization transistor are turned on, a leakage current may flow from the gate terminal of the driving transistor to the initialization voltage unit. When a leakage current flows, the gate voltage of the driving transistor may change. For example, when the driving transistor is a P-type (positive type) or N-type (negative type) TFT (Thin Film Transistor), the gate voltage of the driving transistor may change to a value similar to the voltage of the initialization voltage unit due to leakage current. . The voltage of the initialization voltage unit may be a value within a range of the size of the data voltage, which is the gate voltage of the driving transistor. Accordingly, when leakage occurs, the gate voltage of the driving transistor may rise or fall due to the leakage current.

When the gate voltage of the driving transistor changes, a voltage difference value between the source electrode of the driving transistor and the gate electrode of the driving transistor may change. When the voltage difference between the source electrode of the driving transistor and the gate electrode of the driving transistor changes, the driving of the driving transistor may change. For example, the brightness of the light emitting element driven by the driving transistor may be changed to a brightness different from the brightness set by the supplied data voltage. Accordingly, the pixels emit light with a brightness different from the brightness set by the data voltage, causing white spots or dark spots on the screen where the sensor is placed, or screen distortion such as flickering. Can occur.

Various embodiments disclosed in this document are provided with a method for preventing distortion from occurring in a portion of a display screen in which a sensor is disposed by compensating for a change in a gate voltage of a driving transistor of a pixel by light emitted from a sensor, and It is intended to provide an electronic device to which the method is applied.

An electronic device according to an embodiment disclosed in this document includes: a first surface facing a first direction, a second surface facing a second direction opposite to the first surface, and the first surface and the second surface A housing including a third surface that connects and forms a space therein, and is viewed in the first direction through the first surface of the housing, and displays a screen in the first direction using a plurality of pixels , A display driving circuit that provides a vertical synchronization signal and a light emission signal defining one frame driven by the display to the display, disposed to overlap the screen in the second direction of the display, and light in the first direction A sensor that emits light, and a processor operatively connected to the display driving circuit and the sensor, wherein the processor is in a hold state when gate voltages of the driving transistors of each of the plurality of pixels in the one frame Synchronize the emission timing of the light so that the sensor emits the light, and the processor or the display driving circuit calculates a change amount of the gate voltage of the driving transistor during the one frame according to the emission of the light, and the The display driving circuit may compensate the gate voltage output from the display driving circuit by the amount of change in the gate voltage and provide the compensation to the driving transistor.

In addition, a method of compensating for a driving change of a pixel according to a leakage current due to light emission from a sensor disposed to overlap a display of an electronic device according to an exemplary embodiment disclosed in this document is Operation of the processor synchronizing the emission timing of the light so that the sensor emits light when the gate voltages of the driving transistors of each of the plurality of pixels arranged on the display are in a hold state during one frame defined by a synchronization signal The processor or the display driving circuit calculates a change amount of the gate voltage of the driving transistor during the one frame according to the emission of the light, and the display driving circuit outputs the change amount of the gate voltage from the display driving circuit. Compensating for the gate voltage to be provided to the driving transistor may be included.

In addition, the electronic device according to an exemplary embodiment disclosed in the present document is provided with a recording medium storing a plurality of instructions for compensating for a driving change of a pixel according to a leakage current due to light emission from a sensor arranged to overlap a display. A plurality of instructions, the processor to emit the light from the sensor when the gate voltage of the driving transistor of each of the plurality of pixels arranged on the display in one frame defined by a vertical synchronization signal is in a hold state. Synchronize light emission timing, the processor or the display driving circuit calculates a change amount of the gate voltage of the driving transistor during the one frame according to the emission of the light, and the display driving circuit calculates the change amount of the gate voltage to the display It may be set to compensate for the gate voltage output from the driving circuit and provide it to the driving transistor.

According to the embodiments disclosed in this document, by setting the number of times the sensor emits light during one frame period to a specified number, the amount of change in the gate voltage of the pixel may be set to a specified size. The display driving circuit may supply a data voltage capable of canceling a change in the gate voltage of the pixel during one frame period to the driving transistor of the pixel. Accordingly, the display driving circuit accurately compensates for the amount of change in the gate voltage of the pixel to drive the pixel, thereby preventing distortion of the screen from occurring in the portion where the sensor is disposed.

In addition, according to the exemplary embodiments disclosed in the present document, the display driving circuit may compensate for a change amount of the gate voltage of the pixel during one frame period in advance and supply it to the driving transistor of the pixel. The display driving circuit may compensate in advance for a change in the gate voltage of the pixel before the frame starts. Accordingly, the display driving circuit can prevent in advance a phenomenon in which the screen is distorted in the portion where the sensor is disposed.

In addition to this, various effects that are directly or indirectly identified through this document can be provided.

1 is a block diagram of an electronic device in a network environment according to various embodiments of the present disclosure.
2A is a block diagram of a display device according to various embodiments of the present disclosure.
2B is a block diagram of a display device according to various embodiments of the present disclosure.
3 is a diagram illustrating a housing, a display, and a sensor of an electronic device according to an exemplary embodiment.
4 is a circuit diagram illustrating a pixel of a display according to an exemplary embodiment.
5 is a timing graph showing a vertical synchronization signal of a driving transistor of a pixel, a gate voltage, a light from a sensor, an emission signal of a display driving circuit, and brightness of a pixel according to an exemplary embodiment.
6 is a timing graph showing a vertical synchronization signal for one frame, a gate voltage of a driving transistor of a pixel, a light from a sensor, a light emission signal of a display driving circuit, and brightness of a pixel according to an exemplary embodiment.
7 is a table showing the number of times light is emitted and a change amount of a gate voltage in one frame according to an exemplary embodiment.
8 is a table showing the number of times light is emitted in one frame and the degree of distortion of color coordinate values according to an exemplary embodiment.
9 is a flowchart illustrating a method of compensating for a driving change of a pixel according to a leakage current due to light emission from a sensor, according to an exemplary embodiment.
10 is a diagram illustrating a method of canceling a driving change of a pixel according to light emission from a sensor in a display of an electronic device according to an exemplary embodiment.
In connection with the description of the drawings, the same or similar reference numerals may be used for the same or similar components.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include various modifications, equivalents, and/or alternatives of the embodiments of the present invention.

1 is a block diagram of an electronic device 101 in a network environment 100 according to various embodiments. Referring to FIG. 1, in a network environment 100, the electronic device 101 communicates with the electronic device 102 through a first network 198 (for example, a short-range wireless communication network), or a second network 199 It is possible to communicate with the electronic device 104 or the server 108 through (eg, a long-distance wireless communication network). According to an embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108. According to an 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, and 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 ) Can be included. In some embodiments, at least one of these components (eg, 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, for example, executes software (eg, a program 140) to implement at least one other component (eg, a hardware or software component) of the electronic device 101 connected to the processor 120. It can be controlled and can perform various data processing or operations. According to an embodiment, as at least a part of data processing or operation, the processor 120 may transfer commands or data received from other components (eg, the sensor module 176 or the communication module 190) to the volatile memory 132. It is loaded into, processes commands or data stored in the volatile memory 132, and the result data may be stored in the nonvolatile memory 134. According to an embodiment, the processor 120 includes a main processor 121 (eg, a central processing unit or an application processor), and a secondary processor 123 (eg, a graphic processing unit, an image signal processor) that can be operated independently or together with the main processor 121 (eg, a central processing unit or an application processor). , A sensor hub processor, or a 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 secondary processor 123 may be implemented separately from the main processor 121 or as a part thereof.

The co-processor 123 is, for example, in place of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 is active (eg, executing an application). ) While in the state, together with the main processor 121, at least one of the components of the electronic device 101 (for example, the display device 160, the sensor module 176, or the communication module 190) It is possible to control at least some of the functions or states associated with it. According to an embodiment, the coprocessor 123 (eg, an image signal processor or a communication processor) may be implemented as a part of other functionally related components (eg, the camera module 180 or the 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 nonvolatile 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 a command or data to be used for a component of the electronic device 101 (eg, the processor 120) from outside (eg, a user) of the electronic device 101. The input device 150 may include, for example, a microphone, a mouse, a keyboard, or a digital pen (eg, a stylus pen).

The sound output device 155 may output an sound signal to the outside of the electronic device 101. The sound 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 incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part of the speaker.

The display device 160 may visually provide information to the outside of the electronic device 101 (eg, 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 set to sense a touch, or a sensor circuit (eg, a pressure sensor) set to measure the strength of a force generated by the touch. have.

The audio module 170 may convert sound into an electrical signal, or conversely, may convert an electrical signal into sound. According to an embodiment, the audio module 170 acquires sound through the input device 150, the sound output device 155, or an external electronic device (eg: Sound can be output through the electronic device 102) (for example, a speaker 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 an embodiment, the sensor module 176 is, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.

The interface 177 may support one or more specified protocols that may be used for the electronic device 101 to connect directly or wirelessly with 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 an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that a user can perceive through tactile or motor sensations. According to an 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 a still image and a video. According to an 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 an embodiment, the power management module 188 may be implemented as at least a part of, for example, a power management integrated circuit (PMIC).

The battery 189 may supply power to at least one component of the electronic device 101. According to an 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 includes 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 is possible to support establishment and communication through the established communication channel. The communication module 190 operates 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 an 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 : A local area network (LAN) communication module, or a power line communication module) may be included. Among these communication modules, a corresponding communication module is a first network 198 (for example, a short-range communication network such as Bluetooth, WiFi direct or IrDA (infrared data association)) or a second network 199 (for example, a cellular network, the Internet, or It can communicate with external electronic devices through a computer network (for example, a telecommunication network such as a 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 subscriber information stored in the subscriber identification module 196 (eg, International Mobile Subscriber Identifier (IMSI)) in a communication network such as the first network 198 or the second network 199. The electronic device 101 can be checked and authenticated.

The antenna module 197 may transmit a signal or power to the outside (eg, an external electronic device) or receive from the outside. According to an embodiment, the antenna module may include one antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed 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, for example, provided by the communication module 190 from the plurality of antennas. Can be chosen. The signal or power may be transmitted or received between the communication module 190 and an external electronic device through the at least one selected 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 (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI))) between peripheral devices and signals ( E.g. commands or data) can be exchanged with each other.

According to an embodiment, commands 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 a device of the same or different type as the electronic device 101. According to an embodiment, all or part of the operations executed by the electronic device 101 may be executed by one or more of the external electronic devices 102, 104, or 108. For example, when the electronic device 101 needs to perform a function or service automatically or in response to a request from a user or another device, the electronic device 101 In addition or in addition, it is possible to request one or more external electronic devices to perform the function or at least part of the service. 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 transmit a 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 a part of a response to the request. For this, for example, cloud computing, distributed computing, or client-server computing technology may be used.

2A is a block diagram 200 of a display device 160 according to various embodiments. Referring to FIG. 2A, the display device 160 may include a display 210 and a display driver integrated circuit (DDI) 230 for controlling the display 210. The display driving circuit 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 display driving circuit 230 transmits, for example, image data, or image information including an image control signal corresponding to a command for controlling the image data, to the other of the electronic device 101 through the interface module 231. It can be received from the component. For example, according to an embodiment, the image information is the processor 120 (for example, the main processor 121 (for example, an application processor)) or the co-processor 123 that operates independently of the function of the main processor 121 ( Example: It may be received from a graphic processing device) The display driving circuit 230 may communicate with the touch circuit 250 or the sensor module 176 through the interface module 231. In addition, the display driving circuit ( 230) may store at least a portion of the received image information in the memory 233, for example, in a frame unit. The image processing module 235 may, for example, store at least a part of the image data Pre-processing or post-processing (eg, resolution, brightness, or size adjustment) may be performed based at least on the characteristics of data or characteristics of the display 210. The mapping module 237 is pre-processed through the image processing module 135. Alternatively, a voltage value or a current value corresponding to the post-processed image data may be generated According to an embodiment, generation of a voltage value or a current value may include, for example, a property of pixels of the display 210 (eg: It may be performed based at least in part on the arrangement 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 on the voltage value or the current value. Visual information (eg, text, image, or icon) corresponding to the image data may be displayed through the display 210 by being driven based on at least a part.

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

According to an embodiment, the display device 160 may further include at least one sensor of the sensor module 176 (eg, a fingerprint sensor, an iris sensor, a pressure sensor, or an illuminance sensor), 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 (for example, the display 210 or the display driving circuit 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 provide biometric information related to a touch input through a partial area of the display 210. (Eg, fingerprint image) can be acquired. As another example, when the sensor module 176 embedded in the display device 160 includes a pressure sensor, the pressure sensor may acquire pressure information related to a touch input through a part or all of the display 210. I 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.

2B is a block diagram 270 of the display device 160 according to various embodiments.

In an embodiment, the sensor module 176 may not be included in the display device 160. The sensor module 176 may be mounted separately from the display device 160 in an electronic device (eg, the electronic device 101 of FIG. 1 ).

In an embodiment, the sensor module 176 may be connected to the sensor hub 271. The sensor hub 271 may be mounted separately from the sensor module 176 or may be mounted inside the sensor module 176. The sensor hub 271 may control the operation of the sensor module 176. The sensor module 176 may transmit the sensed data to the sensor hub 271. The sensor hub 271 may be a sensor driving circuit and/or a sensor processor.

In an embodiment, the sensor hub 271 and the display driving circuit 230 may be connected. The sensor hub 271 and the display driving circuit 230 may exchange synchronization signals with each other. The sensor hub 271 and the display driving circuit 230 may synchronize or match operation timings of each other using a synchronization signal.

3 is a diagram illustrating a housing 310, a display 320, and a sensor 330 of the electronic device 101 according to an exemplary embodiment.

In one embodiment, the housing 310 connects a first surface facing a first direction, a second surface facing a second direction opposite to the first surface, and the first surface and the second surface, It may include a third surface to form a space in the. The first direction may be a direction toward the front side of the electronic device 101. The first side may be a front plate. The second direction may be a direction toward the rear side of the electronic device 101. The second side may be a back plate. The third surface may be a side member. The side member may be combined with the back plate or may be formed integrally with the back plate. An electric material such as a speaker 311 may be disposed in the housing 310. The electric material may be a structure for connection with an external device and/or an opening visible to the outside such as a USB port or an earphone jack.

In an embodiment, the display 320 may be viewed in a first direction through the first surface of the housing 310. For example, the display 320 may be viewed as the front surface of the electronic device 101 through at least a portion of the front plate. However, the present invention is not limited thereto, and the display 320 may extend to at least a part of the third surface and at least a part of the second surface of the housing 310. For example, the display 320 may be viewed from the side of the electronic device 101 through at least a portion of the side member. As another example, the display 320 may be viewed as a rear surface of the electronic device 101 through at least a portion of the rear plate. A plurality of pixels may be disposed on the display 320. The display 320 may display a screen in a first direction using a plurality of pixels. Each of the plurality of pixels disposed on the display 320 may receive a data voltage according to a data signal and a gate voltage according to a scan signal from a display driving circuit (eg, the display driving circuit 230 of FIG. 2 ). Each of the plurality of pixels may emit light with a brightness corresponding to a difference value between the data voltage and the data voltage.

In an embodiment, the display 320 may include a first area 321 and a second area 322. The first area 321 may be an area that does not overlap with the sensor 330 in the first direction or the second direction. Icons representing applications installed in the electronic device 101 may be displayed in the first area 321. For example, the first area 321 may display a phone icon, a contact icon, a message icon, and/or an entire app display icon. As another example, the first area 321 may display a signal reception sensitivity for wireless communication of the electronic device 101, a battery remaining amount percentage display, and/or a battery remaining amount icon. The second area 322 may be an area overlapping the sensor 330 in the first direction or the second direction. Pixels disposed in the second area may be affected by light emission from the sensor 330.

In an embodiment, the sensor 330 may be disposed in the second direction of the display 320. The sensor 330 may be disposed to overlap the screen of the display 320. For example, the sensor 330 may be disposed on the rear surface of the display 320. The sensor 330 may be disposed on the upper front edge of the housing 310. For example, the sensor 330 may be disposed on the upper front edge of the display 320 to display the percentage of remaining battery power in the first area 321 and adjacent to the remaining battery power icon. However, the present invention is not limited thereto, and the sensor 330 may be disposed at the central portion of the display 320 or may be disposed at the bottom of the display 320. For example, when the sensor 330 is a fingerprint sensor, the sensor 330 may be disposed under the display 320.

In an embodiment, the sensor 330 may emit light in the first direction. The sensor 330 may detect an external state by emitting light to the front surface of the electronic device 101. For example, the sensor 330 may be a proximity sensor disposed at the front edge of the housing 310 to detect whether an external object is close within a specified distance. As another example, the sensor 330 may be an IR type fingerprint sensor that acquires biometric information such as a user's fingerprint using infrared (IR). When the sensor 330 is a proximity sensor, the sensor 330 may emit light from an infrared light emitting diode (IR LED) as an external object. The sensor 330 may calculate a distance between the electronic device 101 and the external object by using light reflected from an external object.

In an embodiment, the electronic device 101 may include a display driving circuit 230 and a processor operatively connected to the sensor 330 (eg, the processor 120 of FIG. 1 ). The processor 120 may provide image data to the display driving circuit 230. The processor 120 may provide various control signals for controlling the operation of the display driving circuit 230 to the display driving circuit 230. The display driving circuit 230 may generate a data signal and a scan signal for driving the display 320. The processor 120 may set a timing at which the sensor 330 emits light.

In an exemplary embodiment, a white spot or a dark spot may occur on a portion of the screen of the display 320 where the sensor 330 is disposed, or screen distortion such as flickering may occur. This is because a driving change of a pixel occurs according to a leakage current due to light emission of the sensor 330. This will be described in more detail with reference to FIG. 4.

4 is a circuit diagram 400 illustrating pixels of a display (eg, the display 320 of FIG. 3) according to an exemplary embodiment. The pixel may include a light emitting element EL, a first capacitor C1, a storage capacitor Cst, and first to seventh transistors T1, T2, T3, T4, T5, T6, and T7.

In an embodiment, an anode and a cathode of the light emitting device EL may be connected to the first electrode and the second electrode of the first capacitor C1, respectively. The light-emitting element EL may emit light with a luminance set according to a voltage applied to both ends of the first capacitor C1. The light emitting device EL may be an organic light emitting diode (OLED).

In an embodiment, the voltage of the gate electrode G may be kept constant in the first transistor T1 by the storage capacitor Cst. The first transistor T1 may receive the data voltage DATA through the source electrode S under the control of the second transistor T1. The first transistor T1 may output a driving current for driving the light emitting element EL to the drain electrode D according to the data voltage DATA and the voltage of the gate electrode G. The first transistor T1 may be a driving transistor of a pixel. The first transistor T1 may be a P-type (positive type) or an N-type (negative type) TFT (Thin Film Transistor).

In an embodiment, the third transistor T3 may maintain the gate voltage of the first transistor T1 during the current frame under the control of the first scan signal G1. The fourth transistor T4 may initialize the gate voltage of the first transistor T1 to the initialization voltage Vint in the next frame under the control of the second scan signal G2. The fifth transistor T5 may supply the high potential reference voltage ELVDD to the source electrode S of the first transistor T1 under the control of the emission signal EM. The sixth transistor T6 may supply a driving current to the light emitting element EL according to the control of the light emitting signal EM. The seventh transistor T7 may initialize the voltage of the first capacitor C1 according to the control of the third scan signal G3.

In an embodiment, each of the plurality of pixels may receive a data voltage DATA corresponding to a brightness and a color to be displayed in a current frame from the display driving circuit 230. The first transistor T1, which is a driving transistor of the pixel, is driven with the data voltage DATA supplied from the current frame, so that the light emitting element EL, such as an organic light emitting diode, can emit light with a specified luminance. Specifically, the data voltage DATA is supplied to the source electrode S of the first transistor T1, and the source electrode S of the first transistor T1 and the gate electrode G of the first transistor T1 The luminance of the light emitting element EL driven by the first transistor T1 may be set by the voltage difference value of.

In one embodiment, when a sensor (for example, the sensor 330 of FIG. 3) overlaps a pixel of the display 320, the light emitted from the sensor 330 is disposed so that at least a portion of the sensor 330 overlaps. The gate voltage, which is the voltage of the gate electrode G of the first transistor T1 of the pixel, may be changed. Specifically, the third transistor T3, which is a diode-connected transistor connecting the gate terminal G and the drain terminal D of the first transistor T1, is turned on by the light emitted from the sensor 330. -on) can be made. In addition, the fourth transistor T4, which is an initialization transistor that selectively connects the gate terminal G1 of the first transistor T1 and an initialization voltage part supplying the initialization voltage Vint, may be turned on. When the third and fourth transistors T3 and T4 are turned on, a leakage current LC may flow from the drain terminal D of the first transistor T1 to the initialization voltage unit. When the leakage current LC flows, the gate voltage of the first transistor T1 may change. For example, when the first transistor T1 is a P-type (positive type) or an N-type (negative type) thin film transistor (TFT), the gate voltage of the first transistor T1 is the voltage of the initialization voltage part due to leakage current. It can be changed to a value similar to. The voltage of the initialization voltage unit may be a value within a range of the size of the data voltage, which is the gate voltage of the driving transistor. Accordingly, when leakage occurs, the gate voltage of the driving transistor may rise or fall due to the leakage current.

In one embodiment, when the gate voltage of the first transistor T1 changes, the voltage difference value between the source electrode S of the first transistor T1 and the gate electrode G of the first transistor T1 changes. can do. When the voltage difference between the source electrode S of the first transistor T1 and the gate electrode G of the first transistor T1 changes, driving of the first transistor T1 may change. For example, the brightness of the light emitting element EL driven by the first transistor T1 may be changed to a brightness different from the brightness set by the supplied data voltage DATA. Accordingly, the pixel may emit light with a brightness different from that set by the data voltage DATA.

5 illustrates a vertical synchronization signal (V_Sync), a gate voltage (VG), and a sensor (eg, the sensor 330 of FIG. 3) of a pixel driving transistor (eg, the first transistor T1 of FIG. 4) according to an exemplary embodiment. ) Of light IR_LED, a light emission signal EM of a display driving circuit (for example, the display driving circuit 230 of FIG. 2 ), and a pixel brightness (PB).

In an embodiment, the vertical synchronization signal V_Sync may define one frame period. The vertical synchronization signal V-Sync may change from a low state to a high state every specified period. One frame period may start when the point-based synchronization signal (V-Sync) changes from a low state to a high state.

In an embodiment, the gate voltage VG may maintain the first voltage V1, which is the initializing voltage (eg, the initializing voltage Vint of FIG. 4) at the start of one frame displaying the screen. For example, the initialization voltage Vint may be about -3.5V. The gate voltage VG may change from the first voltage V1 to the second voltage V2 during one frame. The gate voltage VG may change to the second voltage V2 when the display driving circuit 230 addresses the data voltage VDATA.

In an embodiment, after the data voltage VDATA is addressed, the second voltage V2, which is the gate voltage, may be a voltage that differs by the data voltage VDATA and the threshold voltage of the driving transistor T1. have. The size of the data voltage VDATA may be set according to the brightness to be displayed by the light emitting element EL. In FIG. 5, a case in which the magnitude of the second voltage V2 is smaller than the magnitude of the first voltage V1 is illustrated, but the present invention is not limited thereto. For example, when the light emitting element EL is set to emit light with maximum brightness, the data voltage VDATA may be set to about -8V. As another example, when the light emitting element EL is set to display a black state, the data voltage VDATA may be set to about +7V. The gate voltage may maintain the second voltage V2 until the next frame. While the gate voltage is maintained at the second voltage V2, the third and fourth transistors (eg, the third and fourth transistors T3 and T4 of FIG. 4) may maintain a turn-off state. have.

In an embodiment, the display driving circuit 230 may provide the emission signal EM to the display. During one frame in which the display 210 displays the screen, the light emission signal EM may change from a high state to a low state at least one or more times. For example, as shown in the third graph 530 of FIG. 5, the emission signal EM is in a low state when the gate voltage changes to the second voltage V2 and then a specified period has elapsed within one frame. Can be changed to. When the emission signal EM changes to a low state, the drain electrode of the driving transistor T1 (eg, the drain electrode D of FIG. 4) as a light emitting device (eg, the light emitting device EL of FIG. 4) The drive current output from may flow.

In an embodiment, when the light emitting signal EM changes to a low state and a driving current flows, the light emitting element EL emits light and the pixel brightness (PB) may have a specified brightness value. As shown in the fourth graph 540 of FIG. 5, the pixel brightness (PB) may change in response to the change timing of the emission signal EM. For example, when the light emitting signal EM is in a high state and the light emitting element EL is turned off, a brightness value may be the first brightness value L1. As another example, when the light emitting element EL is turned on because the light emitting signal EM is in a high state, the brightness value may have a second brightness value L2 greater than the first brightness value L1. .

In one embodiment, the sensor 330 may emit light IR_LED at any timing. For example, the sensor 330 may change to a high state while emitting light IR_LED in a period in which the light emission signal EM maintains a low state. As shown in the second graph 520 of FIG. 5, the light IR_LED may be kept in a low state and then changed to a high state instantaneously when the light IR_LED is emitted.

In one embodiment, when the sensor 330 emits light (IR_LED), the third and fourth transistors T3 and T4 are turned on so that a leakage current (eg, leakage current LC in FIG. 4) flows. As a result, the gate voltage VG may be affected. For example, when the sensor 330 emits light IR_LED and changes to a high state, the gate voltage VG may change from the second voltage V2 to the third voltage V3. The third voltage V3 may be less than the first voltage V1 and may have a value greater than the second voltage V2. For example, when the driving transistor T1 is a P-type TFT, the gate voltage VG may increase when the light IR_LED is emitted.

In an embodiment, when the gate voltage VG changes, pixel brightness (PB) may be affected. For example, when the gate voltage VG changes from the second voltage V2 to the third voltage V3, the pixel brightness (PB) is changed from the second brightness value L2 to the third brightness value ( L3) can be changed. The third brightness value L3 may be a value greater than the first brightness value L1 and smaller than the second brightness value L2. For example, when the driving transistor T1 is a P-type TFT, when the gate voltage VG increases, the pixel brightness (PB) may decrease.

6 illustrates a vertical synchronization signal (V_Sync) for one frame, a gate voltage (VG) of a driving transistor (eg, the first transistor T1 of FIG. 4), and a sensor (eg. : Shows the light IR_LED of the sensor 330 of FIG. 4, the emission signal EM of the display driving circuit (eg, the display driving circuit 230 of FIG. 2 ), and the pixel brightness (PB) It is a timing graph 600.

In an embodiment, the display driving circuit 230 may provide a vertical synchronization signal V_Sync defining one frame driven by the display (eg, the display 320 of FIG. 3) to the display 320. A time point at which the vertical synchronization signal V_Sync changes to a high state may be a time point at which one frame starts. The vertical synchronization signal V_Sync may maintain a low state during one frame. The vertical synchronization signal V_Sync may change to a high state at the start of the next frame. For example, the vertical synchronization signal graph 601 may change to a high state at the start of one frame and maintain a low state in the rest of the period.

In one embodiment, the processor (for example, the processor 120 of FIG. 1) is configured to emit light (IR_LED) from the sensor 330 when the driving transistor T1 is in a hold state during one frame. The emission timing of can be synchronized. The hold state may be a state in which the gate terminal of the driving transistor maintains a specified voltage. For example, the hold state may be a state before the driving transistor T1 receives the data voltage and emits it.

In one embodiment, the light IR_LED is in the gate voltage VG when a driving current flows through the light emitting device of the pixel (eg, the light emitting device EL of FIG. 4) because the light emitting signal EM is in a high state. Can have an effect. The light IR_LED may affect pixel brightness (PB) when a driving current flows through the light emitting element EL of the pixel because the light emission signal EM is in a high state.

In an embodiment, the processor 120 may adjust the timing so that the light IR_LED is emitted only when the light emission signal EM has an impulse period. In the case of FIG. 6, the processor 120 may set the timing so that the light IR_LED is emitted only when the emission signal EM is in a high state. For example, the processor 120 indicates the point at which the second graph 620 indicating the emission timing of the light IR_LED changes to a high state, and the third graph 630 indicates the inflow timing of the emission signal EM. ) Can be set to be included in a section in a high state.

In an embodiment, like the first graph 610, the processor 120 may control the amount of change in the gate voltage VG due to the emission of light IR_LED during one frame. The processor 120 may predict how much the gate voltage VG will change during one frame by the light IR_LED before one frame starts. For example, when the light IR_LED is emitted once during one frame, the processor 120 may predict that the gate voltage VG rises from the fourth voltage V4 to the second voltage V2. As another example, as shown in FIG. 6, when light (IR_LED) is emitted twice during one frame, the processor 120 has a gate voltage VG equal to twice the difference between the fourth voltage V4 and the second voltage V2. It can be predicted to change as much.

In one embodiment, the processor 120 or the display driving circuit 230 calculates the amount of change in the gate voltage VG of the driving transistor T1 of each of the plurality of pixels during one frame according to the emission of light IR_LED. can do. For example, as shown in FIG. 6, when light (IR_LED) is emitted twice during one frame, the processor 120 has a value corresponding to twice the difference between the fourth voltage V4 and the second voltage V2. May be calculated as the amount of change in the gate voltage VG.

In an embodiment, the processor 120 or the display driving circuit 230 compensates the gate voltage VG output from the display driving circuit 230 by the amount of change in the gate voltage VG and provides the compensation to the driving transistor T1. I can. For example, as shown in FIG. 6, when the gate voltage VG changes by a value corresponding to twice the difference between the fourth voltage V4 and the second voltage V2 during one frame, the processor 120 The gate voltage VG provided at the start of one frame may be set to a fourth voltage V4 lower than the second voltage V2 by a difference value between the second voltage V2 and the third voltage V3. The processor 120 may control the display driving circuit 230 so that the display driving circuit 230 outputs the fourth voltage V4 when one frame starts.

In an embodiment, pixel brightness (PB) may change according to a change in the gate voltage VG. For example, when the gate voltage VG is the fourth voltage V4, the pixel brightness PB may have a fourth brightness value L4. As another example, when the gate voltage VG changes to the second voltage V2, the pixel brightness PB may change to the second brightness value L2. As another example, when the gate voltage VG changes to the third voltage V3, the pixel brightness PB may change to the third brightness value L3.

In an exemplary embodiment, the user may recognize that the pixels emit uniformly with an average value of pixel brightness (PB) for one frame. For example, as shown in the fourth graph 640 of FIG. 6, the pixel brightness (PB) within one frame is a fourth brightness value (L4), a second brightness value (L2), and a third brightness value. In the case of having (L3), the user may recognize that the pixel brightness (PB) constantly emit light at the second brightness value L2, which is an average value for one frame. When the user recognizes that the pixel emits light at the second brightness (L2), which is the brightness originally intended to be displayed in the pixel, the phenomenon that the pixel brightness (PB) is distorted according to the change of the gate voltage (VG) is to the user. It can prevent the problem of being recognized.

In an embodiment, the display driving circuit 230 compensates for a change amount of the gate voltage VG of the driving transistor T1 of each of the plurality of pixels during one frame before the start of one frame, so that the driving transistor T1 Can be provided as. For example, when the gate voltage VG of the driving transistor T1 increases by a first value in a first pixel and a second value in a second pixel from the start of one frame to the end of the frame, the processor ( 120) is provided by reducing the gate voltage VG of the driving transistor T1 of the first pixel by a first value, and decreasing the gate voltage VG of the driving transistor T1 of the second pixel by a second value. Can provide.

In one embodiment, the display driving circuit 230 is in a state in which the average value of the gate voltage VG of each of the plurality of pixels during one frame is in a state in which the sensor (eg, the sensor 330 of FIG. 3) is inactive. In the case of, the change amount of the gate voltage VG of the driving transistor T1 of each of the plurality of pixels is compensated to be substantially the same as the gate voltage VG of each of the plurality of pixels and provided to the driving transistor T1. have. For example, the display driving circuit 230 changes the gate voltage VG twice during one frame, increases the gate voltage VG by about 0.5V each time, and emits light (IR_LED). When the timing is at the time of 1/3 and 2/3 of the frame and the emission interval of the light (IR_LED) is constant within one frame, one frame is held so that the average value of the gate voltage (VG) for one frame is kept constant. It can be provided by reducing the starting gate voltage by about 0.5V. As another example, when the light emission timing of the light IR_LED is at a point in time of 1/4 and a point in time of 1/2 of one frame, the display driving circuit 230 is The gate voltage at the start of one frame may be reduced by about 0.625V so that the average value of the gate voltage VG during the frame is kept constant.

In an embodiment, the driving transistor T1 may be a P-type or N-type TFT. For example, the driving transistor T1 may be a P-type TFT. When the driving transistor T1 is a P-type TFT, the gate voltage VG of the driving transistor T1 may increase by a first change amount, which is a designated change amount for each emission timing of the light IR_LED. For example, each time the light IR_LED is emitted, the gate voltage VG increases by a first change amount, and the third voltage V3 is higher than the second voltage V2, which is a designated voltage for one frame. ) Can be changed.

In an embodiment, the display driving circuit 230 may provide a fourth voltage V4 lower than the second voltage V2, which is a designated voltage for one frame, by a first variation amount to the gate of the driving transistor T1. . For example, as shown in FIG. 6, when the light IR_LED is emitted twice during one frame, the display driving circuit 230 provides a second voltage V2, which is a designated voltage for one frame, to the gate of the driving transistor T1. A fourth voltage V4 that is lower by the first variation is provided so that the gate of the driving transistor T1 has the fourth voltage V4, the second voltage V2, and the third voltage V3 during one frame. I can.

In an embodiment, the light emission signal EM may have an impulse period N times (N is a natural number) during one frame. For example, the light emission signal EM may maintain a low state and then change to a high state in an impulse period. N may be set according to the type of the display driving circuit 230 and the type and/or size of the display 210. For example, the light emission signal EM may change to a high state four times during one frame. The emission timing of the light IR_LED may be selected from a period in which the emission signal EM maintains a high state. The number of times the light (IR_LED) is emitted during one frame may be set to 1 or more and N or less. The number of times the light IR_LED is emitted may be set according to the sensing mode and/or sensing sensitivity of the sensor 330.

In one embodiment, the processor 120 includes a first period in which the display driving circuit 230 turns on the emission signal EM (for example, the third graph 630 of FIG. 6 is high ( The first timing to start the period in the high) state) may be received from the display driving circuit 230. The processor 120 may be set to output light IR_LED through the sensor 330 during a first period starting after the first timing. The processor 120 may inactivate the sensor 330 to prevent the sensor 330 from outputting the light IR_LED in a period other than the first period.

FIG. 7 is a table 700 showing the number of times light (eg, light (IR_LED) in FIG. 6) is emitted in one frame according to an exemplary embodiment and a change amount of a gate voltage (eg, gate voltage (VG) in FIG. 6) to be. FIG. 7 may illustrate a case of a 4-duty driving method in which the light-emitting element (eg, the light-emitting element EL of FIG. 4) is driven four times in one frame as shown in FIG. 6. However, the present invention is not limited thereto, and values related to the amount of change in the gate voltage VG may be 4 or more or less than 4 depending on the number of duties included in one frame.

In one embodiment, the display driving circuit (for example, the display driving circuit 230 of FIG. 2) is a memory for storing a change amount of the gate voltage VG according to the number of times the light IR_LED is emitted (for example, the memory of FIG. 2 ). (233)) may be further included. The memory 233 may store a change amount of the gate voltage VG for each number of times the light IR_LED is emitted during one frame. For example, when the light IR_LED is emitted once during one frame, the memory 233 may store a change amount of the gate voltage VG as the first change amount. As another example, when the light IR_LED is emitted twice during one frame, the memory 233 may store the change amount of the gate voltage VG as the second change amount. When a voltage change of substantially the same amount occurs every time the light IR_LED is emitted, the second change amount may be about twice the first change amount. In this case, it is possible to store only the first amount of change without having to separately store the second amount of change. However, the present invention is not limited thereto, and the second change amount is twice the first change amount depending on the characteristics of the circuit of the driving transistor (eg, the first transistor T1 in FIG. 4) and/or the pixel constituting the display 210. It may have a larger value or a value smaller than twice the first change amount. As another example, when the light IR_LED is emitted three times during one frame, the memory 233 may store a change amount of the gate voltage VG as a third change amount. As another example, when the light IR_LED is emitted four times during one frame, the memory 233 may store a change amount of the gate voltage VG as a fourth change amount.

In one embodiment, when the number of times the light (IR_LED) is emitted during one frame is the same, the memory 233 additionally reflects the timing at which the light (IR_LED) is emitted within one frame to emit light (IR_LED) within one frame. The amount of change according to the timing can be saved. The average amount of change of the gate voltage VG during one frame may vary according to the timing at which the light IR_LED is emitted within one frame. For example, if light (IR_LED) is emitted at an early point within one frame, the gate voltage (VG) can be changed at an earlier point to have more influence on the average amount of change in the gate voltage (VG) during one frame. have. The memory 233 may store a case in which the timing at which the light IR_LED is emitted is early within one frame as a case in which the gate voltage VG has a larger amount of change.

In an embodiment, the processor 120 may calculate the number of times the light IR_LED is emitted in one frame and transmit it to the display driving circuit 230. For example, the processor 120 may transmit count information obtained by counting the number of times the light IR_LED enters a high state in one frame to the display driving circuit 230.

In one embodiment, the display driving circuit 230 compensates for the gate voltage VG by the amount of change in the gate voltage VG according to the number of times the light IR_LED is emitted in one frame, 1 transistor (T1)). For example, when the light IR_LED is emitted once during one frame, the display driving circuit 230 may compensate the gate voltage VG by a first change amount from the original value and supply it to the driving transistor T1. As another example, when the light IR_LED is emitted twice during one frame, the display driving circuit 230 may compensate the gate voltage VG by a second change amount from the original value and supply it to the driving transistor T1.

FIG. 8 is a table 800 showing the number of times light (eg, light (IR_LED) of FIG. 6) is emitted in one frame according to an exemplary embodiment and the degree of distortion of color coordinate values. FIG. 8 may illustrate a case of a 4-duty driving method in which the light-emitting element (eg, the light-emitting element EL of FIG. 4) is driven four times in one frame as shown in FIG. 6. However, the present invention is not limited thereto, and the number of values related to the degree of distortion of the color coordinate values may be 4 or more or less than 4 depending on the number of duties included in one frame.

In an embodiment, the plurality of pixels may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. For example, each of the plurality of pixels may have an RGB array structure including one red sub-pixel, one green sub-pixel, and one blue sub-pixel. As another example, each of the plurality of pixels is a pentile in which one red sub-pixel and one green sub-pixel are disposed in one column, and one blue sub-pixel and another green sub-pixel are disposed in different columns. It can have a structure.

In an embodiment, display in a red sub-pixel, a green sub-pixel, and a blue sub-pixel according to a gate voltage (for example, the gate voltage VG of FIG. 6) of a driving transistor (eg, the driving transistor T1 of FIG. 4) A memory (eg, the memory 233 of FIG. 2) for storing color coordinate values measured for each location on the display (eg, the display 320 of FIG. 3) may be further included. For example, in consideration of the arrangement structure of the sub-pixels and the physical characteristics of the display 320, the memory 233 determines which color is displayed when a gate voltage specified for each sub-pixel is applied. table, LUT) format. As another example, when the display 320 and the display driving circuit 230 are manufactured, a display 320 that displays full-white and a display that displays full-color for each pixel of a single color Gate voltages of the sub-pixels in 320 may be measured, and the measured gate voltage may be stored in the memory 233.

In an embodiment, the display driving circuit 230 may calculate a degree of distortion of a color coordinate value for one frame according to emission of light IR_LED. For example, the memory 233 of the display driving circuit 230 may store the degree of distortion of the color coordinate value as the color coordinate value is distorted by the first degree of distortion when light (IR_LED) is emitted once in one frame. have. As another example, when the light IR_LED is emitted twice in one frame, the memory 233 may store the degree of distortion of the color coordinate value as the color coordinate value is distorted by the second degree of distortion. As another example, the memory 233 may store the degree of distortion of the color coordinate value as the color coordinate value is distorted by the third degree of distortion when the light IR_LED is emitted three times in one frame. As another example, the memory 233 may store the degree of distortion of the color coordinate value as the color coordinate value is distorted by the fourth degree of distortion when the light IR_LED is emitted four times in one frame.

In an embodiment, the processor 120 may adjust the gate voltage VG output from the display driving circuit 230 to compensate for the degree of distortion of the color coordinate value and provide it to the driving transistor T1. For example, when the light (IR_LED) is emitted once in one frame, the processor 120 considers that the color coordinate value is distorted by the first degree of distortion, so that the gate voltage VG changes to the opposite of the first degree of distortion. Can be adjusted. The display driving circuit 230 may output the adjusted gate voltage VG.

9 is a flowchart 900 illustrating a method of compensating for a driving change of a pixel according to a leakage current due to light emission from a sensor (eg, the sensor 330 of FIG. 3) according to an exemplary embodiment.

In operation 910, a processor (eg, the processor 120 of FIG. 1) of an electronic device (eg, the electronic device 101 of FIG. 1) according to an embodiment 230)) to a display (eg, the display 210 of FIG. 2), a plurality of frames disposed on the display 210 among one frame defined by a vertical synchronization signal (eg, a vertical synchronization signal (V_Sync) of FIG. 6). Light (IR_LED) to emit light (eg, light (IR_LED) of FIG. 6) from the sensor 330 when the driving transistor of the pixels of FIG. 4 is in a hold state. The emission timing of can be synchronized. The hold state may be a state in which the gate terminal of the driving transistor maintains a specified voltage. For example, the hold state may be a state before the driving transistor T1 receives the data voltage and emits it. The processor 120 may set the timing so that the light IR_LED is emitted only when the driving transistor T1 is in a hold state. The processor 120 may control the amount of change in the gate voltage VG due to the emission of light IR_LED during one frame.

In operation 920, the processor 120 or the display driving circuit 230 of the electronic device 101 according to an exemplary embodiment may have a gate voltage of the driving transistor T1 during one frame according to the emission of light IR_LED (eg: The amount of change in the gate voltage VG of FIG. 6 may be calculated.

In operation 930, the display driving circuit 230 of the electronic device 101 according to an exemplary embodiment compensates the gate voltage VG output from the display driving circuit 230 by the amount of change in the gate voltage VG, thereby compensating the driving transistor ( T1) can be provided. The display driving circuit 230 compensates for a change amount of the gate voltage VG of the driving transistor T1 of each of the plurality of pixels during one frame before the start of one frame and provides the compensation to the driving transistor T1. . The display driving circuit 230 has an average value of the gate voltage VG of each of the plurality of pixels during one frame is substantially equal to the gate voltage VG of each of the plurality of pixels when the sensor 330 is inactive. To be the same, a change amount of the gate voltage VG of the driving transistor T1 of each of the plurality of pixels may be compensated and provided to the driving transistor T1.

10 illustrates a change in driving a pixel according to light emission from a sensor 330 in a display (eg, the display 320 of FIG. 3) of an electronic device (eg, the electronic device 101 of FIG. 1) according to an exemplary embodiment. It is a diagram 1000 showing how to do.

In an embodiment, pixel brightness (PB) may change within one frame according to a change in a gate voltage. The processor (eg, the processor 120 of FIG. 1) may calculate the average pixel brightness AVB within one frame.

In an embodiment, the display driving circuit 230 may display a specific object 1010 on the display 320 so as to overlap with the sensor 330. The display driving circuit 230 may position the object 1010 to cover an area where the sensor 330 emits light. The display driving circuit 230 may set the brightness of the object 101 to be substantially the same as the average pixel brightness AVB by the sensor 330. For example, the display driving circuit 230 sets a user experience (UX) display icon such as a speaker that is always displayed as the object 1010, and positions the object 1010 so as to overlap with the sensor 330 to enter the user's position. A seamless state in which a change in driving of a pixel according to light emission of the sensor 330 by the sensor may not be recognized may be implemented.

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 smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. The electronic device according to the exemplary embodiment of the present document is not limited to the above-described devices.

Various embodiments of the present document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutes of the corresponding embodiments. 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 above items unless clearly indicated otherwise in a related context. 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 one of the phrases, or all possible combinations thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish the component from other Order) is not limited. Some (eg, first) component is referred to as “coupled” or “connected” to another (eg, second) component, with or without the terms “functionally” or “communicatively”. When mentioned, it means that any of the above components may be connected to the other components directly (eg by wire), wirelessly, or via 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, parts, or circuits. The module may be an integrally configured component or a minimum unit of the component or a part thereof that performs 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 document include one or more commands stored in a storage medium (eg, internal memory 136 or external memory 138) that can be read by a machine (eg, electronic device 101). It may be implemented as software (for example, the program 140) including them. For example, the processor (eg, the processor 120) of the device (eg, the electronic device 101) may call and execute at least one command among 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 invoked. The one or more instructions may include code generated by a compiler or code executable by an interpreter. A storage medium that can be read by a 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 (e.g., electromagnetic wave). It does not distinguish between temporary storage cases.

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

According to various embodiments, each component (eg, module or program) of the above-described components may include a singular number or a plurality of entities. According to various embodiments, one or more components or operations among 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, a module or program) 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 in 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 sequentially, parallel, repeatedly, or heuristically executed, or one or more of the operations may be executed in a different order or omitted. , Or one or more other actions may be added.

310: housing 320: display
330: sensor

Claims (20)

In the electronic device,
A first surface facing a first direction, a second surface facing a second direction opposite to the first surface, and a third surface connecting the first surface and the second surface to form a space therein. A housing;
A display that is viewed in the first direction through the first surface of the housing and displays a screen in the first direction using a plurality of pixels;
A display driving circuit that provides a vertical synchronization signal and a light emission signal defining one frame driven by the display to the display;
A sensor disposed in the second direction of the display so as to overlap the screen and emitting light in the first direction; And
A processor operatively connected to the display driving circuit and the sensor,
The processor synchronizes the emission timing of the light so that the sensor emits the light when the gate voltages of the driving transistors of each of the plurality of pixels in the one frame are in a hold state,
The processor or the display driving circuit calculates a change amount of the gate voltage of the driving transistor during the one frame according to the emission of the light,
The display driving circuit compensates the gate voltage output from the display driving circuit by the amount of change in the gate voltage and provides the compensation to the driving transistor. The method according to claim 1, wherein the display driving circuit,
Storing the gate voltage immediately before the light is emitted, the emission intensity, time, the emission timing within the one frame, or the amount of change, the number of changes, or the change timing of the gate voltage according to the number of emission within the one frame. Contains more memory,
The processor,
The intensity and time at which the light is to be emitted among the one frame, the emission timing within the one frame, or the number of times of the emission within the one frame are calculated and transmitted to the display driving circuit,
The display driving circuit is a compensation value in consideration of the amount of change, the number of changes, or the change timing of the gate voltage according to the intensity, time, emission timing within the 1 frame, or emission number within the 1 frame during the 1 frame. An electronic device that compensates for the gate voltage by the amount and provides it to the driving transistor. The method according to claim 1,
The display driving circuit compensates for a gate voltage of the driving transistor of each of the plurality of pixels during the first frame before the first frame starts, and provides the compensation to the driving transistor. The method according to claim 1,
The display driving circuit is configured such that an average value of brightness of each of the plurality of pixels during the one frame is substantially equal to an average value of brightness of each of the plurality of pixels when the sensor is inactive. An electronic device that compensates for a gate voltage of a driving transistor of each of the plurality of pixels and provides it to the driving transistor. The method according to claim 1,
The light emission signal has an impulse period N times (N is a natural number) during the 1 frame,
The emission timing of the light is selected among the impulse periods,
An electronic device in which the number of times of light emission during the one frame is set to 1 or more and N or less. The method of claim 5,
The driving transistor is a P-type or N-type TFT,
The gate voltage of the driving transistor changes by a first change amount, which is a designated change amount, for each emission timing of the light,
The display driving circuit comprises the second voltage based on a first voltage that is a high voltage during the first frame, a second voltage that is a low voltage, and a third voltage due to emission of the light at the gate of the driving transistor. An electronic device that provides a fourth voltage that is a voltage value compensated based on the first change amount and the number of times the light is emitted. The method of claim 1, wherein the processor,
The display driving circuit receives from the display driving circuit a first timing for starting a first period in which the light emission signal is turned on, and the sensor during the first period starting after the first timing An electronic device configured to output the light through. The method according to claim 1,
The plurality of pixels includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel,
Further comprising a memory for storing color coordinate values obtained by measuring colors displayed by the red sub-pixel, green sub-pixel, and blue sub-pixel according to the gate voltage of the driving transistor for each position on the display,
The display driving circuit calculates a degree of distortion of the color coordinate value during the one frame according to the emission of the light,
An electronic device that adjusts a data voltage output from the display driving circuit to offset a degree of distortion of the color coordinate value and provides it to the gate electrode of the driving transistor. In a method for compensating for a driving change of a pixel according to a leakage current due to light emission from a sensor disposed to overlap a display of an electronic device,
To emit light from the sensor when the gate voltage of the driving transistor of each of the plurality of pixels arranged on the display among one frame defined by the vertical synchronization signal supplied to the display by the display driving circuit is in a hold state. Synchronizing, by a processor, timing of emission of the light;
Calculating, by the processor or display driving circuit, an amount of change, a number of changes, and a change timing of the gate voltage of the driving transistor during the one frame according to the emission of the light; And
And compensating, by the display driving circuit, the gate voltage output from the display driving circuit by a compensation value of the gate voltage, and providing it to the driving transistor. The method of claim 9,
The processor calculates the intensity and time at which the light is to be emitted among the one frame, the emission timing within the one frame, or the number of times of the emission within the one frame, and transmits the calculation to the display driving circuit
The display driving circuit compensates the gate voltage by a change amount of the gate voltage according to the number of times the light is emitted during the one frame and provides the compensation to the driving transistor. The method of claim 9, wherein the display driving circuit compensates for a gate voltage of the driving transistors of each of the plurality of pixels during the first frame before starting the first frame and provides the compensation to the driving transistor. The display driving circuit of claim 9, wherein the average value of the brightness of each of the plurality of pixels during the one frame is substantially equal to the average value of the brightness of each of the plurality of pixels when the sensor is deactivated. A method of providing the driving transistor by compensating the gate voltage of the driving transistor of each of the plurality of pixels to be the same. The method of claim 9, wherein the gate voltage of the driving transistor is maintained at a specified level during the hold state,
The emission timing of the light is selected from a period in which the hold state is maintained,
The number of times the light is emitted during the one frame is set to 1 or more and N or less. The method of claim 13,
The driving transistor is a P-type or N-type TFT,
The gate voltage of the driving transistor changes by a first change amount, which is a designated change amount, for each emission timing of the light,
The display driving circuit comprises the second voltage based on a first voltage that is a high voltage during the first frame, a second voltage that is a low voltage, and a third voltage due to emission of the light at the gate of the driving transistor. A method of providing a fourth voltage that is a voltage value compensated based on the first change amount and the number of emission of the light. The method of claim 9,
The processor,
The display driving circuit receives a first timing from the display driving circuit starting a first period in which the light emission signal is turned on, and transmits the light through the sensor during the first period starting after the first timing. The method set to print. The method of claim 9,
The plurality of pixels includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel,
Further comprising a memory for storing color coordinate values obtained by measuring colors displayed by the red sub-pixel, green sub-pixel, and blue sub-pixel according to the gate voltage of the driving transistor for each position on the display,
The display driving circuit calculates a degree of distortion of the color coordinate value during the one frame according to the emission of the light,
A method of adjusting a data voltage output from the display driving circuit to offset a degree of distortion of the color coordinate value and providing it to the gate electrode of the driving transistor. A recording medium storing a plurality of instructions for compensating for a driving change of a pixel according to a leakage current due to light emission from a sensor disposed so that an electronic device overlaps a display, wherein the plurality of instructions include:
The processor synchronizes the emission timing of the light so that the sensor emits the light when the gate voltage of the driving transistor of each of the plurality of pixels arranged on the display is in a hold state in one frame defined by a vertical synchronization signal. Let,
The processor or a display driving circuit driving the display calculates a change amount of the gate voltage of the driving transistor during the one frame according to the emission of the light,
A recording medium configured to compensate for the gate voltage output from the display driving circuit by the display driving circuit by the amount of change in the gate voltage and provide it to the driving transistor. The method of claim 17, wherein the processor calculates the number of times the light is to be emitted among the one frame and transmits the calculated number of times to the display driving circuit,
The display driving circuit compensates the gate voltage by a change amount of the gate voltage according to the number of times the light is emitted during the one frame and provides the compensation to the driving transistor. The method of claim 17,
The display driving circuit compensates the gate voltage of the driving transistor of each of the plurality of pixels during the one frame before the start of the first frame and provides the compensation to the driving transistor. The method of claim 17,
The display driving circuit comprises the plurality of pixels so that the average value of the gate voltage of each of the plurality of pixels during the one frame is substantially the same as the gate voltage of each of the plurality of pixels when the sensor is inactive. A recording medium for compensating the gate voltage of each of the driving transistors and providing them to the driving transistors.

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