KR20220170610A - Electronic device for controlling different display areas based on different emission signals and method thereof - Google Patents

Abstract

According to an embodiment, an electronic device comprises: a housing; a display panel rollable into the housing; and a display driving circuit operatively connected to the display panel, and configured to provide a first emission signal according to a first period to drive each of first pixels in a first display area of the display panel exposed outside the housing, to provide a second emission signal according to a second period shorter than the first period to drive each of second pixels in a second display area of the display panel rolled into the housing, and to display a second image in the second display area based on the second emission signal to reduce the difference between the gate-source voltage of a first driving transistor for driving each of the first pixels and the gate-source voltage of a second driving transistor for driving each of the second pixels, while displaying a first image in the first display area based on the first emission signal. Therefore, the electronic device can reduce afterimages caused between portions of the display areas and the remaining portions of the display areas. In addition, various embodiments are possible.

Description

Electronic device and method for controlling different display areas based on different light emitting signals

The descriptions below relate to an electronic device and method for controlling different display areas based on different emission signals.

An electronic device including a rollable display includes a first state in which a portion of the rollable display is rolled into a housing of the electronic device and a second state in which a portion of the rollable display is extended out of the housing. 2 states can be provided. The electronic device may have a relatively compact structure by providing the first state and the second state.

In an electronic device including a rollable display, in a state in which a portion of the display area of the rollable display is exposed and the remaining portion of the display area is rolled into a housing of the electronic device, the display area is exposed. An image may be displayed within a portion of the display area among the portion of the area and the remaining portion of the display area. When the image is continuously displayed in the part of the display area, a gate-source voltage of a driving transistor for driving each of the pixels in the part of the display area and driving each of the pixels in the remaining part of the display area A difference between the gate-source voltage of the driving transistor for the driving transistor may be increased. In order to reduce the difference, the electronic device according to an embodiment may apply another voltage to at least some of the pixels in the remaining part of the display area while displaying an image in the part of the display area. ) image can be displayed.

The technical problem to be achieved in this document is not limited to the above-mentioned technical problem, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. .

According to an embodiment, an electronic device includes a housing, a display panel rollable into the housing, and a display panel operatively coupled with the display panel and exposed out of the housing. To drive each of the first pixels in the first display area of the display panel, a first emission signal is provided according to a first cycle, and a second emission signal is provided in the second display area of the display panel rolled into the housing. While providing a second light emitting signal according to a second period shorter than the first period to drive each of the pixels, and displaying a first image in the first display area based on the first light emitting signal, In order to reduce a difference between a gate-source voltage of a first driving transistor for driving each of the first pixels and a gate-source voltage of a second driving transistor for driving each of the second pixels, the second and a display driving circuit configured to display a second image in the second display area based on a light emitting signal.

According to an embodiment, a method for operating an electronic device including a housing and a display panel rollable into the housing includes driving each of first pixels in a first display area of the display panel exposed outside the housing. To do this, a first emission signal is provided according to a first cycle, and a second emission signal is provided to drive each of the second pixels in the second display area of the display panel rolled into the housing. providing an operation according to a second cycle shorter than the first cycle, and performing a first step for driving each of the first pixels while displaying a first image in the first display area based on the first emission signal. In order to reduce a difference between the gate-source voltage of the driving transistor and the gate-source voltage of the second driving transistor for driving each of the second pixels, based on the second light emitting signal, within the second display area An operation of displaying the second image may be included.

According to an embodiment, an electronic device including a display panel that can be rolled into a housing includes a portion of a display area of the display panel rolled into the housing and the display panel exposed outside the housing based on different light emitting signals. By controlling the remaining part of the display area, an afterimage caused between the part of the display area and the remaining part of the display area may be reduced.

Effects obtainable in the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the description below. will be.

1 is a block diagram of an electronic device in a network environment according to various embodiments.
2 is a block diagram of a display module, in accordance with various embodiments.
3A is a simplified block diagram of an electronic device, according to an embodiment.
3B illustrates an example of multiple states of a display of an electronic device, according to one embodiment.
4 illustrates an example of an afterimage caused at a boundary between an exposed display area and a display area rolled into a housing of an electronic device.
5 illustrates an example of a display driving circuit providing different light emitting signals to different display areas, according to one embodiment.
6 illustrates an example of a first light-emitting signal and a second light-emitting signal having different duty ratios, according to an exemplary embodiment.
7 illustrates an example of a first light-emitting signal and a second light-emitting signal having different cycles, according to an exemplary embodiment.
8 shows an example of a light emitting driver, according to one embodiment.
9 illustrates an example of a driving transistor driven based on a light emitting signal, according to an exemplary embodiment.
10 are graphs indicating a relationship between a gate-source voltage of a first driving transistor and a gate-source voltage of a second driving transistor.
11 illustrates an example of a display driving circuit providing different light emitting signals to subregions within the second display area, according to an exemplary embodiment.
12 are graphs indicating a relationship between a gate-source voltage of a first driving transistor and a gate-source voltage of a second driving transistor.
13 illustrates an example of processing a second image in a second display area, according to an exemplary embodiment.
14 is a graph indicating a relationship between a gate-source voltage of a first driving transistor and an overcompensated gate-source voltage of a second driving transistor.
15 is a flowchart illustrating a method of providing different emission signals to different display areas, according to an exemplary embodiment.
16 is a flowchart illustrating a method of providing different light emitting signals to a plurality of subregions within the second display area, according to an exemplary embodiment.
17 is a flowchart illustrating a method of identifying attributes of a second light emitting signal according to a first duty ratio of a first light emitting signal provided for a first display area, according to an exemplary embodiment.
18 is a signal flow diagram illustrating a method of processing display of a second image in a second display area based on illuminance, according to an exemplary embodiment.
19 is a signal flow diagram illustrating a method of overcompensating for voltage stress in a second drive transistor based on identification through a grip sensor, according to one embodiment.

1 is a block diagram of an electronic device 101 within a network environment 100, according to various embodiments.

Referring to FIG. 1 , in a network environment 100, an electronic device 101 communicates with an electronic device 102 through a first network 198 (eg, a short-range wireless communication network) or through a second network 199. It may communicate with at least one of 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 module 150, a sound output module 155, a display module 160, an audio module 170, a sensor module ( 176), interface 177, connection terminal 178, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196 , or the antenna module 197 may be included. In some embodiments, in the electronic device 101, at least one of these components (eg, the connection terminal 178) may be omitted or one or more other components may be added. In some embodiments, some of these components (eg, sensor module 176, camera module 180, or antenna module 197) are integrated into a single component (eg, display module 160). It can be.

The processor 120, for example, executes software (eg, the program 140) to cause at least one other component (eg, hardware or software component) of the electronic device 101 connected to the processor 120. It can control and perform various data processing or calculations. According to one embodiment, as at least part of data processing or operation, the processor 120 transfers instructions or data received from other components (e.g., sensor module 176 or communication module 190) to volatile memory 132. , processing commands or data stored in the volatile memory 132 , and storing resultant data in the non-volatile memory 134 . According to one embodiment, the processor 120 may include a main processor 121 (eg, a central processing unit or an application processor) or a secondary processor 123 (eg, a graphics processing unit, a neural network processing unit ( NPU: neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor). For example, when the electronic device 101 includes the main processor 121 and the auxiliary processor 123, the auxiliary processor 123 may use less power than the main processor 121 or be set to be specialized for a designated function. can The secondary processor 123 may be implemented separately from or as part of the main processor 121 .

The secondary processor 123 may, for example, take the 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, running an application). ) state, together with the main processor 121, at least one of the components of the electronic device 101 (eg, the display module 160, the sensor module 176, or the communication module 190) It is possible to control at least some of functions or states related to. According to one embodiment, the auxiliary processor 123 (eg, image signal processor or communication processor) may be implemented as part of other functionally related components (eg, camera module 180 or communication module 190). there is. According to an embodiment, the auxiliary processor 123 (eg, a neural network processing device) may include a hardware structure specialized for processing an artificial intelligence model. AI models can be created through machine learning. Such learning may be performed, for example, in the electronic device 101 itself where the artificial intelligence model is performed, or may be performed through a separate server (eg, the server 108). The learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning or reinforcement learning, but in the above example Not limited. The artificial intelligence model may include a plurality of artificial neural network layers. Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the foregoing, but is not limited to the foregoing examples. The artificial intelligence model may include, in addition or alternatively, a software structure in addition to a hardware structure.

The memory 130 may store various data used by at least one component (eg, the processor 120 or the sensor module 176) of the electronic device 101 . The data may include, for example, input data or output data for software (eg, program 140) and commands related thereto. The memory 130 may include volatile memory 132 or 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 module 150 may receive a command or data to be used for a component (eg, the processor 120) of the electronic device 101 from an outside of the electronic device 101 (eg, a user). The input module 150 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).

The sound output module 155 may output sound signals to the outside of the electronic device 101 . The sound output module 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. A receiver may be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.

The display module 160 can visually provide information to the outside of the electronic device 101 (eg, a user). The display module 160 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device. According to one embodiment, the display module 160 may include a touch sensor set to detect a touch or a pressure sensor set to measure the intensity of force generated by the touch.

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

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 may include, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a bio sensor, It may include a temperature sensor, humidity sensor, or light sensor.

The interface 177 may support one or more specified protocols that may be used to directly or wirelessly connect the electronic device 101 to an external electronic device (eg, the electronic device 102). According to one 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 may be physically connected to an external electronic device (eg, the electronic device 102). According to one 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 a user may perceive through tactile or kinesthetic senses. 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 moving images. 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 188 may be implemented as at least part of a power management integrated circuit (PMIC), for example.

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 is 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). Establishment and communication through the established communication channel may be supported. The communication module 190 may include one or more communication processors that operate independently of the processor 120 (eg, an application processor) and support 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, : A local area network (LAN) communication module or a power line communication module). Among these communication modules, the corresponding communication module is a first network 198 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 199 (eg, a legacy communication module). It may communicate with the external electronic device 104 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a telecommunications network such as a computer network (eg, a LAN or a WAN). These various types of communication modules may be integrated as one component (eg, a single chip) or implemented as a plurality of separate components (eg, multiple chips). The wireless communication module 192 uses 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 may be identified or authenticated.

The wireless communication module 192 may support a 5G network after a 4G network and a next-generation communication technology, for example, NR access technology (new radio access technology). NR access technologies include high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and access of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low latency (URLLC)). -latency communications)) can be supported. The wireless communication module 192 may support a high frequency band (eg, mmWave band) to achieve a high data rate, for example. The wireless communication module 192 uses various technologies for securing performance in a high frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), and full-dimensional multiplexing. Technologies such as input/output (full dimensional MIMO (FD-MIMO)), array antenna, analog beam-forming, or large scale antenna may be supported. The wireless communication module 192 may support various requirements defined for the electronic device 101, an external electronic device (eg, the electronic device 104), or a network system (eg, the second network 199). According to one embodiment, the wireless communication module 192 is a peak data rate for eMBB realization (eg, 20 Gbps or more), a loss coverage for mMTC realization (eg, 164 dB or less), or a U-plane latency for URLLC realization (eg, Example: downlink (DL) and uplink (UL) each of 0.5 ms or less, or round trip 1 ms or less) may be supported.

The antenna module 197 may transmit or receive signals or power to the outside (eg, an external electronic device). According to one embodiment, the antenna module 197 may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (eg, PCB). According to one embodiment, the antenna module 197 may include a plurality of antennas (eg, an array antenna). 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 selected from the plurality of antennas by the communication module 190, for example. can be chosen A 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, a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module 197 in addition to the radiator.

According to various embodiments, the antenna module 197 may form a mmWave antenna module. According to one embodiment, the mmWave antenna module includes a printed circuit board, an RFIC disposed on or adjacent to a first surface (eg, a lower surface) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, array antennas) disposed on or adjacent to a second surface (eg, a top surface or a side surface) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.

At least some of the components are connected to each other through a communication method between peripheral devices (eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and signal ( 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 external electronic devices 102 or 104 may be the same as or different from the electronic device 101 . According to an embodiment, all or part of operations executed in the electronic device 101 may be executed in one or more external electronic devices among 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 instead of executing the function or service by itself. Alternatively or additionally, one or more external electronic devices may be requested 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 deliver the execution result to the electronic device 101 . The electronic device 101 may provide the result as at least part of a response to the request as it is or additionally processed. To this end, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device 101 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device 104 may include an internet of things (IoT) device. Server 108 may be an intelligent server using machine learning and/or neural networks. According to one embodiment, the external electronic device 104 or server 108 may be included in the second network 199 . The electronic device 101 may be applied to intelligent services (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.

2 is a block diagram 200 of a display module 160, in accordance with various embodiments.

Referring to FIG. 2 , the display module 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, video data or video information including video control signals corresponding to commands for controlling the video data from other components of the electronic device 101 through the interface module 231. can do. For example, according to one embodiment, the image information is processed by the processor 120 (eg, the main processor 121 (eg, an application processor) or the auxiliary processor 123 (eg, an auxiliary processor 123 that operates independently of the function of the main processor 121). Example: The DDI 230 can communicate with the touch circuit 250 or the sensor module 176 through the interface module 231. In addition, the DDI 230 can communicate with the touch circuit 250 or the sensor module 176, etc. At least a portion of the received image information may be stored in the memory 233, for example, in units of frames, and the image processing module 235 may, for example, convert at least a portion of the image data to characteristics of the image data or Preprocessing or postprocessing (eg, resolution, brightness, or size adjustment) may be performed based on at least the characteristics of the display 210. The mapping module 237 performs preprocessing or postprocessing 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 the voltage value or the current value may be a property of pixels of the display 210 (eg, an array of pixels). RGB stripe or pentile structure), or the size of each sub-pixel) At least some pixels of the display 210 are based, for example, at least in part on the voltage value or current value By being driven, visual information (eg, text, image, or icon) corresponding to the image data may be displayed through the display 210 .

According to one embodiment, the display module 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 to 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, light amount, resistance, or charge amount) for a specific position 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 one embodiment, at least a part of the touch circuit 250 (eg, the touch sensor IC 253) is disposed as a part of the display driver IC 230, the display 210, or outside the display module 160. It may be included as part of other components (eg, the auxiliary processor 123).

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

3A is a simplified block diagram of an electronic device, according to an embodiment. This block diagram may indicate a functional configuration of the electronic device 101 shown in 1.

Referring to FIG. 3A , the electronic device 101 may include a processor 120, a display driving circuit 301, and a display panel 302.

In one embodiment, the processor 120 may include the processor 120 shown in FIG. 1 . In one embodiment, the processor 120 may be operatively or operably coupled with or connected with the display driving circuit 301 .

In one embodiment, the display driving circuit 301 may include at least a portion of the DDI 230 shown in FIG. 2 . In one embodiment, the display driving circuit 301 may control the display panel 302 to display an image. In one embodiment, the display driving circuit 301 may display an image within at least a portion of the display area of the display panel 302 under the control of the processor 120 . In another embodiment, the display driving circuit 301 may display an image within at least a portion of the display area of the display panel 302 independently of the control of the processor 120 .

In one embodiment, the display panel 302 may include at least a portion of the display 210 shown in FIG. 2 and/or at least a portion of the DDI 230 shown in FIG. 2 . In one embodiment, the display panel 302 may be operatively coupled to or connected to the display driving circuit 301 . In one embodiment, the display panel 302 may be a rollable display that may roll a portion of the display area of the display panel 302 into a housing of the electronic device 101 . In one embodiment, the display panel 302 may provide a plurality of states.

An example of the plurality of states provided by the display panel 302 may be illustrated through FIG. 3B. 3B illustrates an example of multiple states of a display of an electronic device, according to one embodiment.

Referring to FIG. 3B , the display panel 302 of the electronic device 101 is in one (a) state among the plurality of states, and a part of the display area of the display panel 302 is exposed and the display panel 302 ) may provide a state 310 in which the remaining part of the display area is rolled into the housing 300 . State 310 may be a state in which the display panel 302 provides a viewable area having a minimum size. State 310 may be a state in which the display panel 302 provides an exposed display area having a minimum size. State 310 may be a state in which there is no longer a display area of the display panel 302 to be rolled into the housing due to the limitation of the space formed by the housing 300 . In state 310 , a portion of the exposed display area may be referred to as a first display area 320 . In the state 310 , the remaining portion of the display area rolled into the housing 300 may be referred to as a second display area 330 . In state 310, the first display area 320 may be a visible display area. In state 310 , the first display area 320 may be a display area exposed outside the housing 300 . In state 310 , the second display area 330 may be a non-viewable display area by being rolled into the housing 300 . In the state 310 , the second display area 330 may be a display area covered with the housing 300 by being rolled into the housing 300 .

The display panel 302 may provide a state 350 in which all of the display area of the display panel 302 is exposed as another state among the plurality of states. State 350 may be a state in which the display panel 302 provides a viewable area having a maximum size. State 350 may be a state in which the display panel 302 provides an exposed display area having a maximum size. State 350 may be a state in which there is no longer a display area to be extended out of the housing 300 . In state 350, the first display area 320 and the second display area 330 may be visible display areas. In state 350 , the first display area 320 and the second display area 330 may be display areas exposed outside the housing 300 .

Although not shown in FIG. 3B , the display panel 302 may provide an intermediate state between states 310 and 350 . The intermediate state may refer to a state in which parts of the first display area 320 and the second display area 330 are exposed and the remaining part of the second display area 330 is rolled into the housing. In the intermediate state, the portions of the first display area 320 and the second display area 330 may be visible display areas. In the intermediate state, the portions of the first display area 320 and the second display area 330 may be display areas exposed outside the housing 300 . In the intermediate state, the remaining part of the second display area 330 may be an invisible display area by being rolled into the housing 300 . In the intermediate state, the remaining part of the second display area 330 may be a display area covered by the housing 300 by being rolled into the housing 300 . In the intermediate state, the portions of the first display area 320 and the second display area 330 may be referred to as a third display area. In the intermediate state, the remaining part of the second display area 330 may be referred to as a fourth display area.

Referring back to FIG. 3A , in one embodiment, the display driving circuit 301 displays an image within a portion of the display area of the display panel 302 exposed outside the housing of the electronic device 101, and displays the display. While displaying the image within a portion of the area, a black image distinct from the image may be provided within the remaining portion of the display area rolled into the housing. The black image may be an image in which colors of all areas are configured with black. In one embodiment, the black image may be provided by inactivating pixels within the remaining part of the display area. In one embodiment, the black image may be provided by rendering the black image using pixels within the remaining part of the display area. However, it is not limited thereto.

When a remaining part of the display area extends out of the housing after a certain time has elapsed since the image was displayed within the portion of the display area and the black image was provided within the remaining portion of the display area; An afterimage may occur at a boundary between a portion of the display area exposed outside the housing and a remaining portion of the display area exposed outside the housing.

An example of the afterimage may be illustrated through FIG. 4 . 4 illustrates an example of an afterimage caused at a boundary between an exposed display area and a display area rolled into a housing of an electronic device.

Referring to FIG. 4 , the display area of the display panel 302 may be defined based on the boundary 410 . For example, an area to the left of the boundary 410 is a visible display area exposed outside the housing, and an area to the right of the boundary 410 is an unvisible display area that is rolled into the housing. can be For example, in the state 310, the first display area 320, which is an area on the left with respect to the boundary 410, is a visible display area exposed outside the housing, and The second display area 330, which is the right area, may be a non-visible display area that is rolled into the housing. For another example, in the state 350, the first display area 320 and the second display area 330, which are left areas based on the boundary 410, are visible, visible display areas exposed outside the housing. can be In state 350, the fact that there is no right area based on the boundary 410 may mean that there is no longer a display area rolled into the housing.

In state 310, the display drive circuit 301 displays the image in a first display area 320, which is an area to the left of border 410, exposed out of the housing, and The black image may be provided in the right area, the second display area 330 rolled into the housing. After the state 310 continues for a certain period of time, the state 310 may transition to the state 350 . For example, when a user input 415 for sliding one end of the housing of the electronic device 101 to extend the display area of the display panel 302 is received after the state 310 continues for a predetermined time. , state 310 may transition to state 350. In the state 350 switched from the state 310, the display driving circuit 301 converts the image displayed in the first display area 320 in the state 310 to an enlarged size in the first display area. 320 and the second display area 330 can be displayed. The image displayed in the enlarged size in state 350 may include more information than the image displayed in state 310 . The image displayed in the enlarged size in the state 350 may include a visual object having a larger size than the size of the visual object of the image displayed in the state 310 . However, it is not limited thereto. In one embodiment, the application installed in the electronic device 101 providing the image displayed in the enlarged size in state 350 is the electronic device 101 providing the image displayed in state 310. It can be the same as the application installed inside. However, it is not limited thereto. The image, having the enlarged size, displayed in response to a transition from state 310 to state 350 is related to the luminance of the first display area 320 that displayed the image in state 310 and Due to the difference between the luminance of the second display area 330 that provided the black image in the state 310, the difference between the first display area 320 and the second display area 330 in the state 310 An afterimage may be included around the boundary 410 - 1 that was the boundary. The afterimage corresponds to the gate-source voltage of the driving transistor for the pixel in the first display area 320, which provided the image in state 310, adjacent to the boundary 410-1, and Due to the difference between the gate-source voltage of the driving transistor for the pixel in the second display area 330, which provided the black image in the state 310, adjacent to the boundary 410-1, may be caused. . Meanwhile, the afterimage may disappear after a certain period of time has elapsed.

Referring back to FIG. 3A , in one embodiment, the display driving circuit 301 is configured to prevent, minimize, or reduce the afterimage in the display area of the display panel 302 exposed outside the housing of the electronic device 101. Different light emitting signals may be provided for a part of the display panel 302 and a remaining part of the display area of the display panel 302 rolled into the housing. For example, the display driving circuit 301 provides a first light-emitting signal to a first display area 320 that is a part of the display area of the display panel 302 exposed outside the housing of the electronic device 101. and may provide a second light emitting signal to the second display area 330, which is the remaining part of the display area of the display panel 302 rolled into the housing of the electronic device 101.

An example of providing a first light emitting signal to the first display area 320 and providing a second light emitting signal to the second display area 330 may be illustrated through FIG. 5 . 5 illustrates an example of a display driving circuit providing different light emitting signals to different display areas, according to one embodiment.

Referring to FIG. 5 , in one embodiment, the display driving circuit 301 controls each of the first pixels in the first display area 320 of the display panel 302 exposed outside the housing of the electronic device 101. To drive, a first light-emitting signal 510 may be provided. The first emission signal 510 may be a signal for adjusting a voltage of a source of a first driving transistor for driving each of the first pixels. The first emission signal 510 may be a signal for providing current to each of the first pixels through the first driving transistor. For example, the display driving circuit 301 may apply a first voltage corresponding to a first image to be displayed in the first display area 320 to the gate of the first driving transistor. The display driving circuit 301 applies the first voltage to the gate of the first driving transistor and then provides a first emission signal 510 to the first pixels through the first driving transistor. The first image may be displayed within the first display area 320 by providing a current to each of them.

In one embodiment, the display driving circuit 301, to drive each of the second pixels in the second display area 330 of the display panel 302 rolled up in the housing of the electronic device 101, the second A light emitting signal 520 may be provided. The second emission signal 520 may be a signal for adjusting a voltage of a source of a second driving transistor for driving each of the second pixels. The second emission signal 520 may be a signal for providing current to each of the second pixels through the second driving transistor. For example, the display driving circuit 301 applies a second voltage, the same as the first voltage, corresponding to a second image to be displayed in the second display area 330 to the gate of the second driving transistor. can be authorized. The display driving circuit 301 applies the second voltage to the gate of the second driving transistor and then provides a second emission signal 520 to the second pixels through the second driving transistor. The second image may be displayed within the second display area 330 by providing a current to each of them. In order to prevent, minimize, or reduce afterimages that may occur around the boundary 410 or the boundary 410 between the first display area 320 and the second display area 330, It can be displayed in the second display area 330 rolled into the housing. For example, as in the state 310 of FIG. 4 , when the first image is displayed only within the first display area 320 of the first display area 320 and the second display area 330, the second Since the second emission signal 520 is not provided, the source voltage of the second driving transistor for driving each of the second pixels in the display area 330 may be floated. A difference between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor may occur due to the floating of the source voltage of the second driving transistor. Since the difference causes different voltage stresses in the first driving transistor and the second driving transistor, the second current applied to each of the second pixels through the second driving transistor is It may be different from a first current applied to each of the first pixels through a transistor, and a difference between the first current and the second current may cause the afterimage. The display driving circuit 301 according to an exemplary embodiment may prevent, minimize, or prevent the afterimage by reducing a time interval during which the source voltage of the second driving transistor is floated through providing the second light emitting signal 520 . , can be reduced.

Meanwhile, in one embodiment, the duty ratio of the second light-emitting signal 520 may be smaller than that of the first light-emitting signal 510 . Since the second display area 330 rolled into the housing is a non-visible display area covered by the housing, displaying an image in the second display area 330 consumes power of the electronic device 101. can be a loss in terms of In order to reduce power consumed by displaying an image in the second display area 330, the duty ratio or duty cycle of the second light emitting signal 520 is adjusted to that of the first light emitting signal 510. It may be configured or set smaller than the duty ratio.

An example of the duty ratio of the first light-emitting signal 510 and the duty ratio of the second light-emitting signal 520 may be illustrated through FIG. 6 . 6 illustrates an example of a first light-emitting signal and a second light-emitting signal having different duty ratios, according to an exemplary embodiment.

(%) 또는

이고, 제1 발광 신호(510)의 제1 오프 듀티(off duty)는,

(%) 또는

이다. 제2 발광 신호(520)가 제1 발광 신호(510)와 동일한 주기를 가진다고 가정할 시, 제2 발광 신호(520)는, 시간 길이 a의 주기를 가지고 상기 주기 내에서 시간 길이 c 동안 상기 제2 구동 트랜지스터를 통해 상기 제2 픽셀들 각각에게 전류를 제공하기 위한 온 상태(on state) 내에 있기 때문에, 제2 발광 신호(520)의 제2 듀티 비는

(%) 또는

이고, 제2 발광 신호(520)의 제2 오프 듀티는,

(%) 또는

이다. 디스플레이 구동 회로(301)는, 시인되지 않는 표시 영역(예: 제2 표시 영역(330)) 내에서의 이미지(예: 상기 제2 이미지)의 표시로 인하여 소비되는 전력을 감소시키기 위해, 제1 발광 신호(510)의 제1 듀티 비보다 작은 제2 듀티 비를 가지는 제2 발광 신호(520)를 제공함으로써, 상기 하우징 안으로 말려진 제2 표시 영역(330) 내에서 상기 제2 이미지를 표시할 수 있다. 한편, 상기 제1 듀티 비보다 작은 상기 제2 듀티 비로 인하여, 제2 발광 신호(520)에 기반하여 상기 제2 이미지를 표시하는 동안 제2 표시 영역(330) 내에서 화면 깜박임(screen flickering)이 야기되더라도, 제2 표시 영역(330)은 상기 하우징 안으로 말려진 표시 영역이기 때문에, 상기 화면 깜박임은 사용자에게 시인되지 않을 수 있다. Referring to FIG. 6 , the first emission signal 510 has a period of time length a, and provides current to each of the first pixels through the first driving transistor for a time length b within the period. Since it is in the on state, the first duty ratio of the first emission signal 510 is

(%) or

And the first off duty of the first emission signal 510 is,

(%) or

to be. Assuming that the second light-emitting signal 520 has the same period as the first light-emitting signal 510, the second light-emitting signal 520 has a period of time length a and the first light-emitting signal 520 has a period of time length c within the period. Since it is in an on state for providing current to each of the second pixels through 2 driving transistors, the second duty ratio of the second light emitting signal 520 is

(%) or

, and the second off duty of the second emission signal 520 is,

(%) or

to be. The display driving circuit 301, in order to reduce power consumed due to display of an image (eg, the second image) in a non-visible display area (eg, the second display area 330), first By providing a second light emitting signal 520 having a second duty ratio smaller than the first duty ratio of the light emitting signal 510, the second image can be displayed in the second display area 330 rolled into the housing. can On the other hand, due to the second duty ratio smaller than the first duty ratio, screen flickering occurs within the second display area 330 while displaying the second image based on the second light emitting signal 520. Even if caused, since the second display area 330 is a display area rolled into the housing, the screen flickering may not be recognized by the user.

On the other hand, the fact that the time during which the second light-emitting signal 520 is in the on-state is shorter than the time during which the second light-emitting signal 520 is in the off-state opposite to the on-state is 2 This may mean that the time period during which the source voltage of the driving transistor is floated becomes longer. In one embodiment, in order to prevent a time period in which the source voltage of the second driving transistor is floated from being prolonged, the second period, which is the period of the second light-emitting signal 520, is the first light-emitting signal 510 ) It may be configured or set shorter than the first period, which is a period of. In other words, the number of cycles of the second light emission signal 520 may be greater than the number of cycles of the first light emission signal 510 within one frame period.

The period of the first light-emitting signal 510 and the period of the second light-emitting signal 520 may be illustrated through FIG. 7 . 7 illustrates an example of a first light-emitting signal and a second light-emitting signal having different cycles, according to an exemplary embodiment.

Referring to FIG. 7 , within one frame period having a time length a, the first period of the first light-emitting signal 510 is composed of a time length b, and the second light-emitting signal 520 of the second light-emitting signal 520 The period may consist of a time length c that is shorter than a time length b. Since the display driving circuit 301 provides the second light emitting signal 520 according to the second period shorter than the first period, the display driving circuit 301 provides the second light emitting signal 520 within the second display area 330. While displaying 2 images, a time interval during which the source voltage of the second driving transistor is floated may be reduced. In other words, the display driving circuit 301 prevents, minimizes, or prevents the afterimage from occurring within the display panel 302 by extending the second display area 330 rolled into the housing outside the housing. , can be reduced.

Meanwhile, in one embodiment, a second trigger signal for triggering the second light emitting signal 520 (eg, to provide the second light emitting signal 520 while providing the first light emitting signal 510). : A frame line mark (FLM) signal) may be provided independently of a first trigger signal for triggering the first light-emitting signal 510 .

An example of a light emitting driver for independently providing the first trigger signal and the second trigger signal may be illustrated through FIG. 8 . 8 shows an example of a light emitting driver, according to one embodiment.

Referring to FIGS. 5 and 8 , when the scan direction is the direction 560 shown in FIG. 5 , the display driving circuit 301 includes a second scan line composed of K (K is a natural number greater than 1) scan lines. The first light driver stage 801-1 to the Kth light driver stage in the light driver 800 for providing the second light signal 520 for driving each of the second pixels in the display area 330 By providing the second trigger signal 802 to the first light emitting driver stage 801-1 of 801-K, the second light emitting signal 520-1 to 520-K are sequentially generated. can be provided with For example, each of the second light-emitting signals 520-1 to 520-K may be provided sequentially by being provided at a designated time interval (or with a delay). The display driving circuit 301 generates a first light-emitting signal 510 for driving each of the first pixels in the first display area 320 composed of N-K scan lines (where N is a natural number greater than K). The K+1th light emitting driver stage 801-(K of the K+1th light emitting driver stage 801-(K+1) to the Nth light emitting driver stage 801-N in the light emitting driver 800 for providing By providing the first trigger signal 801 to +1)), each of the first light-emitting signals 510-1 to 510-(N-K) may be sequentially provided. For example, the first light-emitting signal 510-1 to the first light-emitting signal 510-(N-K) may be sequentially provided by being provided at a designated time interval (or with a delay). In one embodiment, the display driving circuit 301 provides a second trigger signal 802 independently of providing the first trigger signal 801, thereby providing the second pixel in the second display area 330. may be independently driven from the first pixels in the first display area 320 .

Although not shown in FIG. 8, when the display panel 302 provides the intermediate state between the state 310 of FIG. 3B and the state 350 of FIG. 3B, the light driver 800 receives a first trigger signal ( 801) and at least one component for changing the number of light driver stages driven based on the second trigger signal 802. For example, a boundary 410 between a portion of the display area of the display panel 302 exposed outside the housing and a remaining portion of the display area of the display panel 302 rolled into the housing to provide the intermediate state. is located between the K-3th light emitting driver stage 801-(K-3) and the K-2th light emitting driver stage 801-(K-2), the display driving circuit 301 Based on controlling one component, a second trigger signal 802 is provided to the first light driver stage 801-1, and the second trigger signal 802 is provided to the K-2th light driver stage 801-(K-2). 1 trigger signal 801 can be provided. However, it is not limited thereto.

Although not shown in FIG. 8 , the display driving circuit 301 may further provide at least one trigger signal as well as the first trigger signal 801 and the second trigger signal 802 . For example, as described later with reference to FIG. 11 , when the second display area 330 is divided into a plurality of subregions and different emission signals are provided to the divided plurality of subregions, the display is driven. The circuit 301 may provide two or more trigger signals to two or more light driver stages among the first light driver stage 801-1 to the kth light driver stage 801-k. For example, the display driving circuit 301 provides the second trigger signal 802 to the first light driver stage 801-1, and the p-th light driver stage 801-p (where p is 1). The third trigger signal may be provided to a natural number greater than or less than k). When the second trigger signal 802 and the third trigger signal are provided, the display driving circuit 301, based on the second trigger signal 802, the first light driver stages 801-1 to (p) -1) The second light-emitting signal 520-1 to the second light-emitting signal 520-(p-1) are provided through the light-emitting driver stage 801-(p-1), and the third trigger signal Based on this, third light emitting signals may be provided through the pth light emitting driver stage 801-p to the kth light emitting driver stage 801-k. However, it is not limited thereto.

On the other hand, the first emission signal 510 can switch the state of the transistor (or switch) connected to the source of the first driving transistor and the state of the transistor (or switch) connected to the drain of the first driving transistor. can A current may be provided to each of the first pixels by switching a state of the transistor connected to the source of the first driving transistor and a state of the transistor connected to the drain of the first driving transistor. The second emission signal 520 may change the state of the transistor (or switch) connected to the source of the second driving transistor and the state of the transistor (or switch) connected to the drain of the second driving transistor. A current may be provided to each of the second pixels by switching a state of the transistor connected to the source of the second driving transistor and a state of the transistor connected to the drain of the second driving transistor.

An example of a driving transistor driven based on a light emitting signal may be illustrated through FIG. 9 . 9 illustrates an example of a driving transistor driven based on a light emitting signal, according to an exemplary embodiment.

9, the state of the transistor 910 connected to the source 902 of the driving transistor 900, which is the first driving transistor including the gate 901 to which the first voltage is applied, and the first driving transistor 910 A state of the transistor 920 connected to the drain 903 of the driving transistor 900, which is a driving transistor, may be switched from an off state to an on state by the first emission signal 510. . Due to the conversion, current 950 may be provided to each of the first pixels through the driving transistor 900 as the first driving transistor. For another example, referring to FIG. 9 , a transistor 910 connected to a source 902 of the driving transistor 900 that is the second driving transistor including a gate 901 to which the second voltage is applied The state of the transistor 920 connected to the drain 903 of the driving transistor 900 as the second driving transistor may be switched from an off state to an on state by the second emission signal 520 . Due to the conversion, current 950 may be provided to each of the second pixels through the driving transistor 900 as the second driving transistor. In one embodiment, the display driving circuit 301 provides the first light emitting signal 510 to the transistors connected to the first driving transistor, respectively, to display the first image outside the housing. A second display area 330 that rolls the second image into the housing based on providing a second light emitting signal 520 to transistors connected to the second driving transistor while displaying in the area 320 can be displayed within

In one embodiment, since the second period of the second light-emitting signal 520 is shorter than the first period of the first light-emitting signal 510, the display driving circuit 301 is the gate-source of the first driving transistor. A difference between voltage and a gate-source voltage of the second driving transistor may be reduced. In one embodiment, since the second duty ratio of the second light-emitting signal 520 is smaller than the first duty ratio of the first light-emitting signal 510, the display driving circuit 301 is rolled into the housing. Power consumed by displaying the second image in the second display area 330 may be reduced. For example, when the second period is shorter than the first period and the second duty ratio is smaller than the first duty ratio, the display driving circuit 301 performs the first driving in the state 310 of FIG. 4 . into the housing while reducing the difference between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor than the difference between the gate-source voltage of the transistor and the gate-source voltage of the second driving transistor. An increase in power consumption due to display of the second image in the rolled up second display area 330 may be reduced.

A relationship between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor may be illustrated through FIG. 10 . 10 are graphs indicating a relationship between a gate-source voltage of a first driving transistor and a gate-source voltage of a second driving transistor.

Referring to FIG. 10 , a graph 1000 shows a first display area 320 and a second display area 320 based on the first emission signal 510 having the first duty ratio of 100% within a time interval a. Only within the first display area 320 of the area 330, the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor, which are changed over time while displaying the first image Indicates the relationship between voltages. The horizontal axis of the graph 1000 indicates time, and the vertical axis of the graph 1000 indicates the gate-source voltage of the driving transistor. A gate-source voltage of the first driving transistor for driving each of the first pixels in the first display area 320 displaying the first image, indicated by line 1010 in graph 1000, and Alternatively, the gate-source voltage of the second driving transistor for driving each of the second pixels in the second display area 330 that provides a black image (or does not display any image) is Due to the plotting of the source voltage of the transistor, it is indicated, such as line 1020 of graph 1000. In other words, within the time interval a, a cumulative stress difference value corresponding to the area 1030 corresponding to the difference between the line 1020 and the line 1010 may occur between the first driving transistor and the second driving transistor. there is.

%의 제2 듀티 비를 가지고

의 시간 길이를 가지는 상기 제2 주기에 따라 제공되는 제2 발광 신호(520)에 기반하여 제2 표시 영역(330) 내에서 상기 제2 이미지를 표시하는 상태 내에서, 시간에 따라 변경되는, 상기 제1 구동 트랜지스터의 게이트-소스 전압과 상기 제2 구동 트랜지스터의 게이트-소스 전압 사이의 관계를 지시한다. 그래프(1050)의 가로축은, 시간을 지시하고, 그래프(1050)의 세로축은, 구동 트랜지스터의 게이트-소스 전압을 지시한다. 그래프(1050) 내의 선(1060)에 의해 지시되는, 상기 제1 구동 트랜지스터의 게이트-소스 전압과 달리, 선(1070)에 의해 지시되는, 상기 제2 구동 트랜지스터의 게이트-소스 전압은, 상기 제2 구동 트랜지스터의 소스 전압의 플로팅을 지시하는 시간 구간(1075)을 포함한다. 비록, 그래프(1050)의 시간 구간 a는, 제1 발광 신호(510)의 상기 제1 듀티 비보다 작은 제2 발광 신호(520)의 상기 제2 듀티 비로 인하여 상기 제2 구동 트랜지스터의 소스 전압이 플로팅되는 시간 구간(1075)을 포함하지만, 상기 상태는, 그래프(1000)의 면적(1030)보다 작은, 선(1060)과 선(1070) 사이의 차이에 대응하는 면적(1080)만큼의 상기 제1 구동 트랜지스터와 상기 제2 구동 트랜지스터 사이의 누적 스트레스 차이 값을 야기할 수 있다. 다시 말해, 전자 장치(101)는, 디스플레이 구동 회로(301)를 이용하여, 상기 제1 듀티 비를 가지고 상기 제1 주기에 따라 제공되는 제1 발광 신호(510) 및 상기 제2 듀티 비를 가지고 상기 제1 주기보다 짧은 상기 제2 주기에 따라 제공되는 제2 발광 신호(520)에 기반하여 상기 제1 이미지 및 상기 제2 이미지를 표시함으로써, 상기 잔상을 방지하거나 최소화하거나 감소시킬 수 있다. Meanwhile, the graph 1050 displays the first image within the first display area 320 based on the first emission signal 510 having the first duty ratio of 100% within the time interval a, ,

with a second duty ratio of %

In a state of displaying the second image in the second display area 330 based on the second light emitting signal 520 provided according to the second period having a time length of, the Indicates a relationship between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor. The horizontal axis of the graph 1050 indicates time, and the vertical axis of the graph 1050 indicates the gate-source voltage of the driving transistor. Unlike the gate-source voltage of the first driving transistor, indicated by line 1060 in graph 1050, the gate-source voltage of the second driving transistor, indicated by line 1070, is 2 includes a time interval 1075 indicating the floating of the source voltage of the driving transistor. However, in the time interval a of the graph 1050, the source voltage of the second driving transistor is reduced due to the second duty ratio of the second light emitting signal 520 that is smaller than the first duty ratio of the first light emitting signal 510. Although it includes a plotted time interval 1075, the state is such that the area 1080 corresponding to the difference between the line 1060 and the line 1070 is smaller than the area 1030 of the graph 1000. A cumulative stress difference between one driving transistor and the second driving transistor may be caused. In other words, the electronic device 101, using the display driving circuit 301, has the first light-emitting signal 510 provided according to the first cycle with the first duty ratio and the second duty ratio By displaying the first image and the second image based on the second light emitting signal 520 provided according to the second cycle shorter than the first cycle, the afterimage may be prevented, minimized, or reduced.

Referring back to FIG. 3A , the display driving circuit 301 moves the second display area 330 rolled into the housing at the boundary 410 between the first display area 320 and the second display area 330. Depending on the distance of , it may be composed of a plurality of subregions, and different light emitting signals may be provided to the plurality of subregions.

An example of providing different light emitting signals to a plurality of subregions within the second display area 330 may be illustrated through FIG. 11 . 11 illustrates an example of a display driving circuit providing different light emitting signals to subregions within the second display area, according to an exemplary embodiment.

Referring to FIG. 11 , the second display area 330 rolled into the housing includes a first partial area 1110 right next to the boundary 410 and a second partial area 1120 next to the first partial area 1110 . ) may be included. The display driving circuit 301 displays the first image within the first display area 320 based on the first emission signal 510 having the first duty ratio and provided according to the first cycle. , Different light emitting signals (eg, the second light emitting signal 520 and the third light emitting signal 1130) may be provided to the first partial area 1110 and the second partial area 1120 . For example, while displaying the first image in the first display area 320, the display driving circuit 301 has the second duty ratio smaller than the first duty ratio and shorter than the first period. A portion of the second image may be displayed in the first partial area 1110 of the second display area 330 based on the second light emission signal 520 provided according to the second cycle. The display driving circuit 301 has a third duty ratio smaller than the second duty ratio and is provided according to a third cycle shorter than the second cycle while displaying the first image and a part of the second image. Based on the third emission signal 1130 , the remaining part of the second image may be displayed in the second partial area 1120 of the second display area 330 . Since the second light emitting signal 520 is a signal provided to the first partial region 1110 adjacent to the boundary 410, the second light emitting signal 520 corresponds to the gate-source voltage of the first driving transistor and the first light emitting signal 520. It may be provided to reduce a difference between a gate-source voltage of a driving transistor for driving each of the pixels in the partial region 1110 . Since the third light-emitting signal 1130 is a signal provided to the second partial region 1120 spaced apart from the boundary 410, the third light-emitting signal 1130 is consumed by displaying the second image. may be provided to reduce power. The display driving circuit 301 according to an exemplary embodiment configures the second display area 330 rolled into the housing as the plurality of subregions, and provides different light emitting signals to the plurality of subregions. By doing so, it is possible to reduce power consumption according to the display of the second image while reducing the afterimage.

Referring back to FIG. 3A , the display driving circuit 301 generates a second light emitting signal 520 based on a light emitting pattern of the first pixels in the first display area 320 for displaying the first image. At least one of the second cycle or the second duty ratio of the second emission signal 520 may be identified. In order to prevent the second light emitting signal 520 from overcompensating the voltage stress in the second driving transistor, the display driving circuit 301 generates the second light emitting light based on the light emitting pattern of the first pixels. The properties of signal 520 can be identified. For example, the display driving circuit 301 may set at least one of the second cycle or the second duty ratio of the second light emitting signal 520 based on the first duty ratio of the first light emitting signal 510. can be identified. For example, the display driving circuit 301 identifies at least one of the second period of the second light emitting signal 520 or the second duty ratio based on the first period of the first light emitting signal 510. can do. For example, the display driving circuit 301, as shown in Table 1 below, based on the first duty ratio of the first light-emitting signal 510, the second period and the second period of the second light-emitting signal 520 A second duty ratio may be identified.

First light-emitting signal 510
(1st cycle (B)) Second light-emitting signal 520 First duty ratio (A) Second duty ratio (C) Second cycle (D) A > R1 C<A D<B R2 < A ≤ R1 C<A D=B A ≤ R2 C=A D=B

In Table 1, A, C, R1, and R2 related to the duty ratio are real numbers greater than 0 and less than or equal to 100 when the duty ratio is expressed using a percentage unit, and B and D related to the period are real numbers greater than 0.

For example, as shown in Table 1, when the first duty ratio A of the first light-emitting signal 510 exceeds the first reference value R1, the display driving circuit 301 outputs the second light-emitting signal 520 to the second light-emitting signal 520. The duty ratio C may be set to be smaller than the first duty ratio A, and the second period D of the second emission signal 520 may be set to be shorter than the first period B. For example, as shown in Table 1, when the first duty ratio A of the first light-emitting signal 510 is equal to or less than the first reference value R1 and greater than the second reference value R2, the display driving circuit 301 emits the second light. The second duty ratio C of the signal 520 may be set to be smaller than the first duty ratio A, and the second cycle D of the second emission signal 520 may be set equal to the first cycle B. For example, as shown in Table 1, when the first duty ratio of the first light-emitting signal 510 is equal to or less than the second reference value R2, the display driving circuit 301 determines the second duty ratio C of the second light-emitting signal 520. may be set equal to the first duty ratio A, and the second cycle D of the second emission signal 520 may be set equal to the first cycle B. As shown in Table 1, the display driving circuit 301 identifies the property of the second light emitting signal 520 based on the light emitting pattern of the first pixels in the first display area 320, thereby controlling the power of the first driving transistor. A difference between the gate-source voltage and the gate-source voltage of the second driving transistor may be reduced or the second emission signal 520 may be prevented from overcompensating voltage stress in the second driving transistor. .

An example of preventing the second emission signal 520 from overcompensating for voltage stress in the second driving transistor may be illustrated through FIG. 12 . 12 are graphs indicating a relationship between a gate-source voltage of a first driving transistor and a gate-source voltage of a second driving transistor.

%의 상기 제1 듀티 비를 가지고,

의 시간 길이를 가지는 상기 제1 주기에 따라 제공되는 제1 발광 신호(510)에 기반하여 제1 표시 영역(320) 내에서 상기 제1 이미지를 표시하고, 0%에 가까운 상기 제2 듀티 비를 가지고,

의 시간 길이를 가지는 상기 제2 주기에 따라 제공되는 제2 발광 신호(520)에 기반하여 제2 표시 영역(330) 내에서 상기 제2 이미지를 표시하는 동안, 시간에 따라 변경되는, 상기 제1 구동 트랜지스터의 게이트-소스 전압과 상기 제2 구동 트랜지스터의 게이트-소스 전압 사이의 관계를 지시한다. 그래프(1200)의 가로축은, 시간을 지시하고, 그래프(1200)의 세로축은, 구동 트랜지스터의 게이트-소스 전압을 지시한다. 디스플레이 구동 회로(301)는, 상기 제1 구동 트랜지스터의 게이트-소스 전압을 지시하는 그래프(1200) 내의 선(1210)과 상기 제2 구동 트랜지스터의 게이트-소스 전압을 지시하는 그래프(1200) 내의 선(1220)과 같이, 상기 제1 듀티 비가 상기 제1 기준 값(예: 표 1의 R1)을 초과하는 경우, 상기 제2 듀티 비를 상기 제1 듀티 비보다 작게 설정하고, 상기 제2 주기를 상기 제1 주기보다 짧게 설정함으로써, 상기 제1 구동 트랜지스터의 게이트-소스 전압과 상기 제2 구동 트랜지스터의 게이트-소스 전압 사이의 차이를 감소시킬 수 있다. For example, referring to FIG. 12, the graph 1200, within time interval a,

With the first duty ratio of %,

The first image is displayed in the first display area 320 based on the first light-emitting signal 510 provided according to the first period having a time length of , and the second duty ratio is close to 0%. with,

While displaying the second image in the second display area 330 based on the second light emitting signal 520 provided according to the second period having a time length of Indicates a relationship between the gate-source voltage of the driving transistor and the gate-source voltage of the second driving transistor. The horizontal axis of the graph 1200 indicates time, and the vertical axis of the graph 1200 indicates the gate-source voltage of the driving transistor. The display driving circuit 301 includes a line 1210 in the graph 1200 indicating the gate-source voltage of the first driving transistor and a line in the graph 1200 indicating the gate-source voltage of the second driving transistor. As in step 1220, when the first duty ratio exceeds the first reference value (eg, R1 in Table 1), the second duty ratio is set to be smaller than the first duty ratio, and the second period By setting the period shorter than the first period, a difference between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor may be reduced.

%의 상기 제1 듀티 비를 가지고

의 시간 길이를 가지는 상기 제1 주기에 따라 제공되는 제1 발광 신호(510)에 기반하여 제1 표시 영역(320) 내에서 상기 제1 이미지를 표시하고, 상기 제1 듀티 비와 동일한 상기 제2 듀티 비를 가지고 상기 제1 주기와 동일한 상기 제2 주기에 따라 제공되는 제2 발광 신호(520)에 기반하여 제2 표시 영역(330) 내에서 상기 제2 이미지를 표시하는 동안, 시간에 따라 변경되는, 상기 제1 구동 트랜지스터의 게이트-소스 전압과 상기 제2 구동 트랜지스터의 게이트-소스 전압 사이의 관계를 지시한다. 그래프(1250)의 가로축은, 시간을 지시하고, 그래프(1250)의 세로축은, 구동 트랜지스터의 게이트-소스 전압을 지시한다. 디스플레이 구동 회로(301)는, 상기 제1 구동 트랜지스터의 게이트-소스 전압을 지시하는 그래프(1250) 내의 선(1260)과 실질적으로 중첩된, 상기 제2 구동 트랜지스터의 게이트-소스 전압을 지시하는 그래프(1250) 내의 선(1270)과 같이, 상기 제1 듀티 비가 상기 제2 기준 값(예: 표 1의 R2) 이하인 경우, 상기 제2 듀티 비를 상기 제1 듀티 비와 동일하게 설정하고, 상기 제2 주기를 상기 제1 주기와 동일하게 설정함으로써, 제2 발광 신호(520)가 상기 제2 구동 트랜지스터 내의 전압 스트레스를 과보상하는(overcompensate) 것을 방지할 수 있다. For another example, referring to FIG. 12, the graph 1250, within time interval a,

With the first duty ratio of %

The first image is displayed in the first display area 320 based on the first emission signal 510 provided according to the first period having a time length of , and the second duty ratio equal to the first duty ratio is While the second image is displayed in the second display area 330 based on the second light emitting signal 520 having a duty ratio and provided according to the second cycle equal to the first cycle, the second image is changed according to time. indicates a relationship between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor. The horizontal axis of the graph 1250 indicates time, and the vertical axis of the graph 1250 indicates the gate-source voltage of the driving transistor. The display driving circuit 301 is a graph indicating the gate-source voltage of the second driving transistor, which substantially overlaps a line 1260 in the graph 1250 indicating the gate-source voltage of the first driving transistor. As shown in line 1270 in 1250, when the first duty ratio is less than or equal to the second reference value (eg, R2 in Table 1), the second duty ratio is set equal to the first duty ratio, By setting the second period equal to the first period, it is possible to prevent the second light emitting signal 520 from overcompensating the voltage stress in the second driving transistor.

Referring back to FIGS. 3A and 3B , the housing of the electronic device 101 includes a first part for providing a path through which the display area of the display panel 302 rolled into the housing can move out of the housing and the housing. A second part fixed independently of the movement of the display area may be included. For example, when the first image is displayed in the first display area 320 and the second image is displayed in the second display area 330, the fixed, independent of the movement of the display area, Light emitted from pixels disposed along the periphery of the first display area 320 adjacent to the second portion of the housing is transmitted through an opaque member (or display panel 302) in the second portion of the housing. It may be blocked by an opaque member inside). On the other hand, when the first image is displayed in the first display area 320 and the second image is displayed in the second display area 330, the first display area adjacent to the first part of the housing Light emitted from the pixels of the second display area 330 disposed along the boundary between the pixel 320 and the second display area 330 may be exposed to the outside through the path. The light exposed to the outside may be viewed when the brightness around the electronic device 101 is less than the reference brightness. In one embodiment, the display driving circuit 301 displays in the second display area 330 when the brightness around the electronic device 101 is less than the reference brightness in order to prevent the external light from being viewed. processing related to the second image may be executed.

An example of processing the second image may be exemplified through FIG. 13 . 13 illustrates an example of processing a second image in a second display area, according to an exemplary embodiment.

Referring to FIG. 13 , the housing 300 of the electronic device 101 is a first part for providing a path through which the second display area 330 rolled into the housing 300 can move out of the housing 300. 1305 and a second part 1310 fixed independently of the movement of the second display area 330 . While the processor 120 of the electronic device 101 displays the first image in the first display area 320 and displays the second image in the second display area 330, the first display area 320 The electronic device ( Data on the brightness around the electronic device 101 may be acquired using the illuminance sensor of 101). When the brightness indicated by the data is equal to or greater than the reference brightness, the processor 120 displays the first image within the first display area 320 and displays the second image within the second display area 330. can keep displaying. When the brightness is less than the reference brightness, the processor 120 may provide a designated signal to the display driving circuit 301 to prevent the light 1315 from being viewed. The display driving circuit 301, in response to receiving the designated signal, may execute processing related to the second image.

In one embodiment, the display driving circuit 301, in response to receiving the designated signal, stops providing the second light-emitting signal 520 to display the second image within the second display area 330. You can stop showing.

In another embodiment, the display driving circuit 301 may display the second image within the second display area 330 at a peak luminance lower than the designated luminance in response to receiving the designated signal. there is.

In another embodiment, the display driving circuit 301, in response to receiving the designated signal, controls the first subregion 1320 and the second subregion of the second display area 330 adjacent to the boundary 410. A part of the second image may be displayed in the second partial area 1330 of the second display area 330 of 1330 . A portion of the second image in the second partial area 1330 has the second duty ratio smaller than the first duty ratio and is provided according to the second period shorter than the first period. ) can be displayed based on. While a part of the second image is displayed in the second partial area 1330, the first partial area 1320 may provide the black image.

In still other embodiments, the display driving circuit 301 may, in response to receiving the specified signal, a pixel in the second subregion 1330 of the first subregion 1320 and the second subregion 1330. A second light emitting signal 520 is provided according to a third period longer than the second period, and based on the second light emitting signal 520 provided according to the third period, the first partial region 1320 ) and a part of the second image in the second partial area 1330 of the second partial area 1330 . While a part of the second image is displayed in the second partial area 1330, the first partial area 1320 may provide the black image.

In another embodiment, the display driving circuit 301, in response to receiving the specified signal, selects pixels in the second partial region 1330 among the first partial region 1320 and the second partial region 1330. A third light-emitting signal having a third duty ratio smaller than the second duty ratio is provided according to the second cycle, and the third light-emitting signal having the third duty ratio and provided according to the second cycle Based on , a part of the second image may be displayed in the second partial area 1330 of the first partial area 1320 and the second partial area 1330 . While a part of the second image is displayed in the second partial area 1330, the first partial area 1320 may provide the black image.

Referring back to FIG. 3A , the afterimage may be caused under the condition that the second display area 330 rolled into the housing of the electronic device 101 extends out of the housing. The display driving circuit 301, in order to reduce power consumed due to the display of the second image in the second display area 330 rolled into the housing, the first display area 320 and the second display area 320 The first image may be displayed only within the first display area 320 of the area 330 . Meanwhile, the processor 120 of the electronic device 101 displays the first image only in the first display area 320 of the first display area 320 and the second display area 330, 2 When the display area 330 is exposed outside the housing, an operation for preventing, minimizing, or reducing the occurrence of the afterimage may be performed. In one embodiment, while the processor 120 of the electronic device 101 displays the first image only within the first display area 320 of the first display area 320 and the second display area 330 , Through the grip sensor of the electronic device 101, whether or not the electronic device 101 is gripped is identified, and the first display disposed along the boundary between the first display area 320 and the second display area 330 History data about gate-source voltages of driving transistors for driving each of the pixels of the region 320 may be obtained. In response to identifying through the grip sensor that the electronic device 101 is gripped, the processor 120 may, from the history data, set a specified time prior to the timing at which it was identified through the grip sensor that the electronic device 101 was gripped. obtaining gate-source voltage values of the driving transistor in a time interval up to, and setting the gate-source voltage value of the second driving transistor (or the gate voltage value of the second driving transistor) higher than the obtained voltage values A third image for forming may be acquired. The processor 120 may provide data on the third image to the display driving circuit 301 in response to acquiring the third image. The display driving circuit 301 is configured to prevent, minimize, or reduce the afterimage from being caused at or around the boundary by extending the second display area 330 rolled into the housing out of the housing. , In response to receiving the data, the third image may be displayed within the second display area 330 . For example, in the third image, before the second display area 330 rolled into the housing is exposed outside the housing, the second display area 330 is formed to overcompensate for voltage stress in the second driving transistor. can be displayed in The display driving circuit 301, in response to identifying that the voltage stress in the second driving transistor corresponds to the voltage stress in the driving transistor by displaying the third image in the second display area 330, Displaying the third image within the second display area 330 may be stopped. The display driving circuit 301 displays the third image in both the first display area 320 and the second display area 330 in response to stopping displaying the third image in the second display area 330 . A fourth image corresponding to the first image and an enlarged image of the first image may be displayed. For example, the fourth image may be an image provided from the same application as the application providing the first image. For example, the fourth image may include more information than the first image. For example, the fourth image may include a visual object having a larger size than the size of the visual object included in the first image. However, it is not limited thereto.

An example of stopping displaying the third image after displaying the third image may be exemplified through FIG. 14 . 14 is a graph indicating a relationship between a gate-source voltage of a first driving transistor and an overcompensated gate-source voltage of a second driving transistor.

Referring to FIG. 14, a graph 1400 shows the gate-of the driving transistor during the time period from the timing at which the electronic device 101 is gripped until the second display area 330 is exposed outside the housing. The relationship between the source voltage and the gate-source voltage of the second driving transistor is shown. The horizontal axis of the graph 1400 indicates time, and the vertical axis of the graph 1400 indicates the gate-source voltage of the driving transistor. For example, the processor 120 displays the first image in a first display area 320 among a first display area 320 exposed outside the housing and a second display area 330 rolled into the housing. During display, the above for driving each of the pixels of the first display area 320 disposed along the boundary between the first display area 320 and the second display area 330, indicated by the line 1410. History data about the gate-source voltage of the driving transistor may be obtained, and whether the electronic device 101 is gripped may be identified through the grip sensor. The processor 120 may identify that the electronic device 101 is gripped through the grip sensor at timing 1415 . Processor 120, in response to the identification, identifies, from the history data, gate-to-source voltage values of the drive transistors in the time interval from timing 1415 to before a designated time T, thereby plotting graph 1400. A value representative of the voltage stress within the drive transistor as dictated by the area (or size) of region 1420 can be obtained. Processor 120 identifies a gate-to-source voltage value of the second driving transistor indicated by voltage value 1430 of graph 1400 based on the value representing the voltage stress in the driving transistor, and The third image for applying the gate-source voltage value of the second driving transistor may be obtained. The processor 120 may transmit data on the third image to the display driving circuit 301 in response to acquiring the third image. The display driving circuit 301 may overcompensate for voltage stress in the second driving transistor by displaying the third image in the second display area 330 in response to receiving the data. Meanwhile, the display driving circuit 301 may display the first image in the first display area 320 while displaying the third image in the second display area 330 . In response to initiating display of the third image, processor 120 or display driving circuit 301 displays line 1435 of graph 1400 indicating the gate-to-source voltage of the second driving transistor. The voltage stress within the second drive transistor indicated by the area (or size) of area 1440 of graph 1400 formed by the voltage stress within the drive transistor indicated by area 1450 of graph 1400 formed by A timing 1455 corresponding to is identified, and in response to the identification, display of the third image within the second display area 330 may be stopped. The display driving circuit 301 displays the third image in both the first display area 320 and the second display area 330 in response to stopping displaying the third image in the second display area 330 . A fourth image may be displayed. While displaying the fourth image, the second display area 330 may be exposed outside the housing at timing 1460 . In other words, in response to identifying that the electronic device 101 is gripped through interworking with the processor 120, the display driving circuit 301 applies voltage stress in the second driving transistor to the gate of the second driving transistor. When the second display area 330 is exposed outside the housing, the afterimage is generated at or around the boundary between the first display area 320 and the second display area 330 by applying a voltage for overcompensating for This can be prevented, minimized or reduced.

As described above, the electronic device 101 provides different light emitting signals to the first display area 320 exposed outside the housing and the second display area 330 rolled into the housing, so that the first display area 320 The afterimage may be prevented, minimized, or reduced from occurring at or around the boundary between the region 320 and the second display region 330 . In an embodiment, the electronic device 101 generates a second light emitting signal 520 having a property identified based on the property of the first light emitting signal 510 (or the light emitting pattern of the first display area 320). By obtaining the voltage stress in the second driving transistor, it is possible to prevent overcompensation. In an embodiment, the electronic device 101 divides the second display area 330 into a plurality of subregions and provides different light emitting signals to the divided plurality of subregions, thereby generating the image of the second image. It is possible to reduce power consumed by the display and to prevent, minimize, or reduce the afterimage from occurring at or around the boundary. In an embodiment, when the electronic device 101 displays the first image only in the first display area 320 of the first display area 320 and the second display area 330, the electronic device 101 The occurrence of the afterimage at or around the boundary may be prevented, minimized, or reduced by overcompensating for the voltage stress of the second driving transistor in response to identifying gripped.

15 is a flowchart illustrating a method of providing different emission signals to different display areas, according to an exemplary embodiment. In this method, the electronic device 101 shown in FIG. 1, the processor 120 shown in FIG. 1 or 3A, the DDI 230 shown in FIG. 2, or the display driving circuit 301 shown in FIG. 3A can be executed by

15 , in operation 1502, the display driving circuit 301 drives each of the first pixels in the first display area 320 of the display panel 302 exposed outside the housing of the electronic device 101. To do this, a first emission signal may be provided according to a first cycle.

In operation 1504, the display driving circuit 301 transmits a second light-emitting signal to the first period to drive each of the second pixels in the second display area 330 of the display panel 302 rolled into the housing. It may be provided according to a shorter second cycle. In one embodiment, since the second display area 330 is an area that is not viewed by being rolled into the housing, the second light emitting signal has a second duty ratio smaller than the first duty ratio of the first light emitting signal. can have In one embodiment, since the second light-emitting signal is a signal provided for the second display area 330 that is not viewed, the second duty ratio of the second light-emitting signal is based on the second light-emitting signal It may be set very small enough to cause screen flicking within the displayed second display area 330 . However, it is not limited thereto. In one embodiment, the second duty ratio may be set to reduce power consumed to display an image in the second display area 330 rolled into the housing. In an embodiment, the second duty ratio may be set based on a light emitting pattern of the first display area 320 that emits light based on the first light emitting signal. In one embodiment, the length of the second period may be set based on the length of the first period. In one embodiment, the second period may be set shorter than the first period in order to compensate for the second duty ratio smaller than the first duty ratio. However, it is not limited thereto.

In operation 1506, the display driving circuit 301 performs a first drive for driving each of the first pixels while displaying a first image in the first display area 320 based on the first emission signal. In order to reduce the difference between the gate-source voltage of the transistor and the gate-source voltage of the second driving transistor for driving each of the second pixels, the second display area 330 is displayed based on the second emission signal. The second image can be displayed in . In one embodiment, the first image displayed in the first display area 320 that is a viewable area may be an image obtained by the processor 120 . In another embodiment, the first image displayed in the first display area 320 that is a viewable area may be an image obtained by the display driving circuit 301 . For example, the first image may be an image obtained by the display driving circuit 301 while the processor 120 is in a low power state. In one embodiment, the second image, unlike the first image obtained by the processor 120, may be obtained by the display driving circuit 301. In another embodiment, the second image may be acquired by the processor 120 . However, it is not limited thereto. In one embodiment, the voltage applied to the gate of the second driving transistor to display the second image may be the same as the voltage applied to the gate of the first driving transistor to display the first image. . The voltage applied to the gate of the second driving transistor is applied to the gate of the first driving transistor to reduce a difference between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor. It can be set equal to the voltage applied to . However, it is not limited thereto. In one embodiment, the second image may be an image corresponding to the first image. In one embodiment, the second image may be an image converted from the first image.

Although not shown in FIG. 15 , the display driving circuit 301 displays the first image in the first display area 320 and displays the second image in the second display area 330 . By extending the second display area 330 rolled inside the housing to the outside of the housing, it can be identified that the second display area 330 is exposed outside the housing. For example, the display driving circuit 301 is operatively coupled with a component of the electronic device 101 for identifying the exposed state of the display panel 302, and the second display area 330 is operatively via the component. ) can be identified as being exposed. For another example, while displaying the first image and the second image, the processor 120 of the electronic device 101 may operate on the component of the electronic device 101 operatively coupled to the processor 120. Through this, it can be identified that the second display area 330 is exposed. The processor 120 may provide a designated signal to the display driving circuit 301 in response to the identification. The display driving circuit 301 may identify that the second display area 330 is exposed based on obtaining the designated signal. However, it is not limited thereto. The display driving circuit 301, in response to the identification, provides the first light-emitting signal according to the first cycle, drives each of the first pixels, and drives each of the second pixels. , A third image may be displayed in the first display area 320 and the second display area 330 by providing the first emission signal according to the first cycle. In one embodiment, the third image may be an enlarged image of the first image. In one embodiment, the third image may be an image created by an application installed in the electronic device 101 that generates the first image. In one embodiment, the third image may include more information than the first image. In one embodiment, the third image may include a visual object that corresponds to the visual object included in the first image and has a larger size than the visual object included in the first image. However, it is not limited thereto.

As described above, the electronic device 101 prevents afterimages from occurring at or around the boundary between the display regions by providing different light emitting signals to display regions having different exposure states, or , can be minimized or reduced.

16 is a flowchart illustrating a method of providing different light emitting signals to a plurality of subregions within a second display area, according to an exemplary embodiment. In this method, the electronic device 101 shown in FIG. 1, the processor 120 shown in FIG. 1 or 3A, the DDI 230 shown in FIG. 2, or the display driving circuit 301 shown in FIG. 3A can be executed by

Operations 1602 to 1606 of FIG. 16 may be related to operations 1504 and 1506 of FIG. 15 .

Referring to FIG. 16 , in operation 1602, the display driving circuit 301 performs a first portion within the second display area 330 right next to the boundary between the first display area 320 and the second display area 330. A second emission signal may be provided to drive each of the pixels in the region. In one embodiment, the second period of the second light-emitting signal may be set shorter than the first period of the first light-emitting signal defined through the description of FIG. 15 . In one embodiment, the second duty ratio of the second light-emitting signal may be set smaller than the first duty ratio of the first light-emitting signal defined through the description of FIG. 15 .

In operation 1604, the display driving circuit 301 performs a third duty ratio smaller than the second duty ratio to drive each of the pixels in the second subregion in the second display area 330 next to the first subregion. A third light emitting signal having a ratio may be provided according to the second period. In an exemplary embodiment, the display driving circuit 301 may include a gate-source voltage of a driving transistor for driving each of the pixels in the first subregion and a voltage of a driving transistor for driving each of the pixels in the second subregion. The third light emitting signal having the third duty ratio is applied in the second period in order to reduce the power consumed in relation to displaying an image in the second display area 330 while reducing the difference between the gate-source voltage. can be provided accordingly. In one embodiment, the display driving circuit 301 may set the period of the third light emitting signal to a third period longer than the second period. For example, the display driving circuit 301 may include the second partial area spaced apart from the first display area 320 in order to reduce power consumed in relation to displaying an image in the second display area 330 . The period of the third light emitting signal provided for the light emitting signal may be set to be longer than the second period. However, it is not limited thereto.

In operation 1606, the display driving circuit 301 displays the second image based on the second light-emitting signal while displaying the first image in the first display area 320 based on the first light-emitting signal. A part of the image may be displayed in the first partial area, and the remaining part of the second image may be displayed in the second partial area based on the third light emitting signal.

As described above, the electronic device 101 includes the second display area 330 rolled into the housing of the electronic device 101 at the boundary between the first display area 320 and the second display area 330. At least one area between the plurality of subregions within the boundary and the second display area 330 is divided into a plurality of subregions according to a distance of It is possible to prevent, minimize, or reduce the occurrence of afterimages at the boundary, the boundary, and around the at least one boundary. The electronic device 101 may reduce power consumed to display an image in the second display area 330 including the plurality of partial areas by using the different emission signals.

17 is a flowchart illustrating a method of identifying attributes of a second light emitting signal according to a first duty ratio of a first light emitting signal provided for a first display area, according to an exemplary embodiment. In this method, the electronic device 101 shown in FIG. 1, the processor 120 shown in FIG. 1 or 3A, the DDI 230 shown in FIG. 2, or the display driving circuit 301 shown in FIG. 3A can be executed by

Operations 1702 to 1710 of FIG. 17 may be related to operation 1504 of FIG. 15 .

Referring to FIG. 17 , in operation 1702, the display driving circuit 301 determines that the first duty ratio of the first light emitting signal provided to the first display area 320 is a reference duty ratio (eg, R1 of Table 1). You can identify whether it is greater than . In one embodiment, the reference duty ratio may be a parameter set to prevent voltage stress in the second driving transistor for driving each of the second pixels by the second emission signal from being overcompensated. there is. In one embodiment, the reference duty ratio may be a parameter set to prevent voltage stress in the second driving transistor from being increased than voltage stress in the first driving transistor due to the second emission signal. However, it is not limited thereto. The display driving circuit 301 may execute operation 1704 based on identifying that the first duty ratio is greater than the reference duty ratio and may otherwise execute operation 1706 .

In operation 1704, the display driving circuit 301 has a second duty ratio smaller than the first duty ratio based on identifying that the first duty ratio is greater than the reference duty ratio (eg, R1 in Table 1). The second light emitting signal may be provided according to a second period shorter than the first period of the first light emitting signal. Since the first duty ratio is greater than the reference duty ratio, it may mean that the probability of voltage stress in the second driving transistor being overcompensated is low, so the display driving circuit 301 may In order to reduce a difference between the gate-source voltage and the gate-source voltage of the second driving transistor, the second period may be shorter than the first period. However, it is not limited thereto.

In operation 1706, the display driving circuit 301, based on identifying that the first duty ratio is less than or equal to the reference duty ratio, determines another reference duty ratio that is less than the reference duty ratio. (e.g., R2 in Table 1). In one embodiment, the other reference duty ratio may be a parameter set to prevent voltage stress in the second driving transistor from being overcompensated by the second emission signal. In one embodiment, the other reference duty ratio may be a parameter set to prevent voltage stress in the second driving transistor from being increased than voltage stress in the first driving transistor due to the second emission signal. . However, it is not limited thereto. The display driving circuit 301 may execute operation 1708 based on identifying that the first duty ratio is greater than the other reference duty ratio, and may otherwise execute operation 1710.

In operation 1708, the display driving circuit 301 transmits a second light emitting signal having a second duty ratio smaller than the first duty ratio based on identifying that the first duty ratio is greater than the other reference duty ratio. 1 It may be provided according to the first cycle of the light emitting signal. When the first duty ratio is less than or equal to the reference duty ratio and greater than the other reference duty ratio, the probability that voltage stress in the second driving transistor is overcompensated when the second emission signal is provided according to the second period Since it means that is high, the display driving circuit 301 can provide the second light-emitting signal according to the first period, which is longer than the second period. However, it is not limited thereto.

In operation 1710, the display driving circuit 301, based on identifying that the first duty ratio is less than or equal to the other reference duty ratio, the first duty ratio having the first duty ratio that is the duty ratio of the first light emitting signal. 2 light-emitting signals may be provided according to the first period, which is the period of the first light-emitting signal. The fact that the first duty ratio is less than or equal to the other reference duty ratio means that voltage stress in the second driving transistor is overcompensated when the second light emitting signal having the second duty ratio is provided according to the first period. Since the probability is high, the display driving circuit 301 may provide the second light emitting signal having the first duty ratio according to the first cycle. However, it is not limited thereto.

17 illustrates an example in which operation 1706 is executed after operation 1702 is executed, but this is for convenience of description. In one embodiment, the display driving circuit 301 compares the first duty ratio with both the reference duty ratio and the other reference duty ratio, and depending on the result of the comparison, operation 1704, operation 1708, or operation 1710 can also be run.

As described above, the electronic device 101 determines the properties of the second light-emitting signal based on the first light-emitting signal provided to the first display area 320 or the light-emitting pattern of the first display area 320. By adaptively changing the voltage stress in the second driving transistor is prevented from being overcompensated, and the afterimage is caused at or around the boundary between the first display area 320 and the second display area 330. can be prevented, minimized, or reduced.

18 is a signal flow diagram illustrating a method of processing a display of a second image in a second display area based on illuminance, according to an exemplary embodiment. This method includes the electronic device 101 shown in FIG. 1, the processor 120 shown in FIG. 1 or 3A, the DDI 230 shown in FIG. 2, and/or the display driving circuit shown in FIG. 3A ( 301).

Operations 1802 to 1808 of FIG. 18 may be related to operation 1506 of FIG. 15 .

Referring to FIG. 18 , in operation 1802, the display driving circuit 301 displays the first image in a first display area 320 and displays the second image in a second display area 330. can do.

In operation 1804, the processor 120 may identify that the brightness around the electronic device 101 is less than the reference brightness through the illuminance sensor of the electronic device 101 while displaying the first image and the second image. there is. Since the housing of the electronic device 101 provides a path through which the second display area 330 can be rolled into or exposed out of the housing, light according to the display of the second image is exposed through the path. It can be. Since the light can be recognized when the surroundings of the electronic device 101 are relatively dark, the processor 120 controls the brightness of the surroundings of the electronic device 101 through the illuminance sensor to prevent or reduce the exposure of the light. , and it is possible to identify that the brightness is less than the reference brightness.

In operation 1806, the processor 120 may transmit a designated signal to the display driving circuit 301 to notify that the brightness is less than the reference brightness based on identifying that the brightness is less than the reference brightness. The display driving circuit 301 may receive the designated signal from the processor 120 .

In operation 1808, the display driving circuit 301 may execute processing related to the second image based on receiving the specified signal. For example, the display driving circuit 301 may stop displaying the second image in the second display area 330 to prevent exposure of the light. For another example, the display driving circuit 301 drives the display panel 302 so that the maximum luminance of the second image is less than a specified luminance in order to prevent exposure of the light or reduce information exposed by the light. You can control it. As another example, the display driving circuit 301 may perform the above operation in a first partial area in the second display area 330 right next to a boundary between the first display area 320 and the second display area 330. Displaying a part of the second image is stopped, and the remaining part of the second image is displayed in the second partial area in the second display area 330 immediately adjacent to the first partial area based on the second light emitting signal. can be displayed Since the first partial area in which display of a portion of the second image is stopped acts as an opaque member for blocking light with respect to the second partial area, the display driving circuit 301 controls the first partial area. It is possible to stop displaying a part of the second image within the area. For another example, the display driving circuit 301 determines that the brightness of the second partial area is greater than or equal to the reference brightness while the display of the part of the second image in the first partial area is stopped. The second light-emitting signal is provided according to a period longer than the period of the second light-emitting signal, which is provided during identification, and the remaining part of the second image within the second partial area based on the second light-emitting signal. can be displayed. For another example, the display driving circuit 301 determines that the brightness of the second partial area is greater than or equal to the reference brightness while the display of the part of the second image in the first partial area is stopped. A third light emitting signal having a duty ratio smaller than that of the second light emitting signal, which is provided during identification, is provided according to the second period, which is the period of the second light emitting signal, and based on the third light emitting signal A remaining part of the second image may be displayed within the second partial area.

As described above, the electronic device 101 is configured to reduce afterimages caused by a difference between the gate-source voltage of the first driving transistor and the gate-source voltage of the second driving transistor. 2 In order to prevent the visibility of the first display area 320 from being reduced due to the image within the display area 330, the brightness around the electronic device 101 is less than the reference brightness by using the illuminance sensor of the electronic device 101. acknowledgment can be identified. The electronic device 101 may provide enhanced visibility through such identification.

19 is a signal flow diagram illustrating a method of overcompensating for voltage stress in a second driving transistor based on identification through a grip sensor, according to one embodiment. This method includes the electronic device 101 shown in FIG. 1, the processor 120 shown in FIG. 1 or 3A, the DDI 230 shown in FIG. 2, and/or the display driving circuit shown in FIG. 3A ( 301).

Referring to FIG. 19 , in operation 1902, the display driving circuit 301 causes the second display area 330 to be rolled into the housing of the electronic device 101 and the first display area 320 to be exposed outside the housing. In this state, the first image may be displayed in the first display area 320 of the first display area 320 and the second display area 330 . While the first image is displayed in the first display area 320 of the first display area 320 and the second display area 330, the gate-source voltage of the first driving transistor and the second driving transistor A difference between the gate-source voltage of may increase due to non-display of the second image in the second display area 330 .

In operation 1904, the processor 120, through the grip sensor of the electronic device 101, controls the first image within the first display area 320 among the first display area 320 and the second display area 330. While displaying , it may be identified that the electronic device 101 is gripped. For example, the processor 120 may identify timing for overcompensating for the voltage stress in the second driving transistor as timing for identifying that the electronic device 101 is gripped through the grip sensor.

In operation 1906, the processor 120, in response to the identification, stores a history including gate-source voltage values of the first driving transistor stored while displaying the first image in the first display area 320. data can be identified. For example, the processor 120 may identify the history data including gate-source voltage values of the first driving transistor prior to a designated time from the identification timing.

In operation 1908, the processor 120 identifies, based on the identified history data, a gate voltage of the second driving transistor required to overcompensate for voltage stress within the second driving transistor, and the second identification Based on the applied gate voltage, a third image may be acquired.

In operation 1910, the processor 120 may provide data on the third image to the display driving circuit 301. The display driving circuit 301 may acquire the data from the processor 120 . In one embodiment, the processor 120 may provide another data for indicating a timing to stop displaying the third image. However, it is not limited thereto.

In operation 1912, the display driving circuit 301 may display the third image within the second display area 330 based on the data. In one embodiment, the display driving circuit 301 is such that voltage stress in the second driving transistor caused by display of the third image is voltage stress in the first driving transistor caused by display of the first image. When corresponding to , the display of the third image may be stopped. It may be identified by the processor 120 that the voltage stress in the second driving transistor caused by the display of the third image corresponds to the voltage stress in the first driving transistor caused by the display of the first image. and may be identified by the display driving circuit 301. In another embodiment, when obtaining the other data from the processor 120, the display driving circuit 301 may stop displaying the third image at the timing indicated by the other data.

Although not shown in FIG. 19 , in one embodiment, the display driving circuit 301 includes a first display area 320 and a second display area 330 in response to stopping the display of the third image. A fourth image obtained based on the first image within the entire display area of the display panel 302 and having a larger size than the first image may be displayed. According to embodiments, the display of the fourth image is based on identifying, through the grip sensor, that the grip of the electronic device 101 is released before the second display area 330 is exposed outside the housing, may be discontinued. In response to stopping the display of the fourth image, the display driving circuit 301 displays the first image in the first display area 320 of the first display area 320 and the second display area 330. You can resume displaying from

As described above, even if the electronic device 101 does not display an image in the non-exposed second display area 330 by being rolled up by the housing, the second display area 330 is exposed before the second display area 330 is exposed. By overcompensating for the voltage stress in the driving transistor, the occurrence of afterimages at or around the boundary between the first display area 320 and the second display area 330 may be prevented, minimized, or reduced.

As described above, an electronic device (eg, the electronic device 101) according to an embodiment includes a housing (eg, the housing 300), and a display panel (eg, a display panel) that can be rolled into the housing. panel 302), and a display driving circuit (eg, display driving circuit 301) operatively coupled to the display panel, wherein the display driving circuit comprises the display panel exposed outside the housing. To drive each of the first pixels in the first display area, a first emission signal is provided according to a first cycle, and each of the second pixels in the second display area of the display panel rolled into the housing In order to drive, a second light emitting signal is provided according to a second period shorter than the first period, and while a first image is displayed in the first display area based on the first light emitting signal, the first light emitting signal is displayed. In order to reduce a difference between the gate-source voltage of the first driving transistor for driving each of the pixels and the gate-source voltage of the second driving transistor for driving each of the second pixels, the second emission signal may be configured to display a second image within the second display area based on the

In one embodiment, the first light-emitting signal may have a first duty ratio, and the second light-emitting signal may have a second duty ratio smaller than the first duty ratio.

In one embodiment, the second duty ratio may be set smaller than the first duty ratio to reduce power consumed for displaying the second image in the second display area rolled into the housing. there is.

In an embodiment, the size of the second duty ratio may be identified based on the size of the first duty ratio.

In an embodiment, the second display area may include a first subarea right next to a boundary between the first display area and the second display area and a second subarea next to the first subarea. The display driving circuit may include a second light emitting signal having a second duty ratio smaller than the first duty ratio of the first light emitting signal to drive each of the pixels in the first partial area. providing a third light emitting signal according to the second cycle and having a third duty ratio smaller than the second duty ratio to drive each of the pixels in the second partial region according to the second cycle; , while displaying the first image in the first display area based on the first light emitting signal, displaying a part of the second image in the first partial area based on the second light emitting signal, It may be further configured to display a remaining part of the second image within the second partial region based on the third light emitting signal, wherein the second light emitting signal is a gate-source voltage of the first driving transistor and It may be provided to reduce a difference between a gate-source voltage of a driving transistor for driving each of the pixels in the first partial region, and the third light-emitting signal may include power consumed by displaying the second image. can be provided to reduce

In an embodiment, the second display area may include a first subarea right next to a boundary between the first display area and the second display area and a second subarea next to the first subarea. wherein the display driving circuit provides the second light-emitting signal according to the second cycle to drive each of the pixels in the first partial area, and each of the pixels in the second partial area In order to drive, a third light emitting signal is provided according to a third period longer than the second period, and while the first image is displayed in the first display area based on the first light emitting signal, the first light emitting signal is displayed. 2 further configured to display a part of the second image in the first partial area based on light emitting signals and display a remaining part of the second image in the second partial area based on the third light emitting signal. and the second emission signal is provided to reduce a difference between a gate-source voltage of the first driving transistor and a gate-source voltage of a driving transistor for driving each of the pixels in the first partial region. and the third light-emitting signal may be provided to reduce power consumed by displaying the second image.

In one embodiment, the length of the second period may be identified based on the length of the first period.

In one embodiment, the display driving circuit may perform the display based on the first light-emitting signal provided according to the first cycle based on identification that the first duty ratio of the first light-emitting signal is greater than or equal to the reference duty ratio. A first image is displayed within the first display area, and the second image is displayed based on the second light-emitting signal provided according to the second cycle and having a second duty ratio smaller than the first duty ratio. display in the second display area, and based on identification that the first duty ratio is smaller than the reference duty ratio, based on the first light emitting signal provided according to the first period, the first image is displayed as the first further configured to display in one display area and display the second image in the second display area based on the second light emitting signal provided according to the first cycle and having the second duty ratio; It can be.

In an embodiment, the display driving circuit may include the first light-emitting signal provided according to the first cycle based on identification that the first duty ratio is smaller than another reference duty ratio that is smaller than the reference duty ratio. The first image is displayed in the first display area based on, and the second image is displayed based on the second light emitting signal provided according to the first cycle and having the first duty ratio. 2 display within the display area, and based on identification that the first duty ratio is smaller than the reference duty ratio and greater than the other reference duty ratio, based on the first light-emitting signal provided according to the first cycle, the first duty ratio An image is displayed in the first display area, and the second light emitting signal having a second duty ratio smaller than the first duty ratio is provided according to the first cycle, and the second image is displayed in the second light cycle. It may be further configured to display within the display area.

In one embodiment, the electronic device may further include an illuminance sensor (eg, an illuminance sensor in the sensor module 176) and a processor (eg, the processor 120), the processor configured to: In response to identifying that the brightness around the electronic device is less than the reference brightness through the illuminance sensor while displaying the first image within the display area and displaying the second image within the second display area, a specified signal is sent. and transmit to the display driving circuit, and the display driving circuit may be further configured to, in response to receiving the specified signal from the processor, stop providing the second light emitting signal.

In one embodiment, while the processor displays the first image in the first display area and displays the second image in the second display area, the brightness around the electronic device is adjusted through the illuminance sensor. In response to identifying that the brightness is less than a reference brightness, send a designated signal to the display driving circuit, wherein the display driving circuit, in response to receiving the designated signal from the processor, displays a maximum luminance lower than the designated luminance. It may be further configured to display the second image within the second display area.

In an embodiment, the second display area may include a first subarea right next to a boundary between the first display area and the second display area and a second subarea next to the first subarea. The second driving transistor may be used for the second partial region among the first partial region and the second partial region, and the processor may display the first image as the first display region. In response to identifying that the brightness around the electronic device is less than the reference brightness through the illuminance sensor while displaying within the display area and displaying the second image within the second display area, a designated signal is sent to the display driving circuit. transmit, wherein the display driving circuit, in response to receiving the designated signal from the processor, drives pixels in the second subregion of the first subregion and the second subregion to: A second light-emitting signal is provided according to the second cycle, and while the first image is displayed in the first display area based on the first light-emitting signal, the first light-emitting signal is applied to the first part based on the second light-emitting signal. It may be further configured to display a part of the second image within the second partial area among the area and the second partial area.

In one embodiment, while the processor displays the first image in the first display area and displays the second image in the second display area, the brightness around the electronic device is adjusted through the illuminance sensor. In response to identifying that the brightness is less than a reference brightness, the display driving circuit may be configured to transmit a designated signal to the display driving circuit, in response to receiving the designated signal from the processor, the first partial region and the display driving circuit. The second light-emitting signal is provided according to a third period longer than the second period in order to drive pixels in the second partial area among the second partial areas, and the first display area is based on the first light-emitting signal. While the first image is displayed in the second partial area of the first partial area and the second partial area based on the second light emitting signal provided according to the third period, the second image It may be further configured to display a part of.

In one embodiment, while the processor displays the first image in the first display area and displays the second image in the second display area, the brightness around the electronic device is adjusted through the illuminance sensor. In response to identifying that the brightness is less than a reference brightness, the display driving circuit may be configured to transmit a designated signal to the display driving circuit, in response to receiving the designated signal from the processor, the first partial region and the display driving circuit. A third light emitting signal having a duty ratio smaller than that of the second light emitting signal is provided according to the second period to drive pixels in the second partial area of the second partial area, and the first light emitting signal is provided. While the first image is displayed in the first display area based on the signal, the first light emission signal of the first partial area and the second partial area is provided according to the second period. It may be further configured to display a portion of the second image within a two-part area.

In an embodiment, the electronic device may further include a grip sensor (eg, a grip sensor in the sensor module 176), and the display driving circuit may be configured such that the electronic device includes the first display area in the housing. and displaying the first image in the first display area of the first display area and the second display area while being in a state where it is exposed out and the second display area is rolled into the housing. The processor may identify that the electronic device is gripped through the grip sensor while displaying the first image in the first display area among the first display area and the second display area, and the identification In response, history data on gate-source voltages of driving transistors for driving each of the pixels of the first display area disposed along the boundary between the first display area and the second display area (the history data Including gate-source voltage values of the driving transistor in a time interval from the identified timing to a specified time before), and based on the history data, the gate-source voltage of the second driving transistor acquire a third image for forming a value higher than gate-source voltage values of the driving transistor, and transmit data for the third image to the display driving circuit, wherein the display driving circuit comprises: It may be further configured to display the third image within the second display area in response to receiving the data from the processor.

In one embodiment, the third image may be displayed within the second display area based on providing the second light emitting signal according to the second cycle.

In one embodiment, the processor may be configured to transmit other data for indicating a time interval for displaying the third image to the display driving circuit, wherein the display driving circuit transmits the data and the other data. In response to receiving, it may be further configured to display the third image within the second display area during the time interval.

In one embodiment, the second image may be an image converted from the first image.

In one embodiment, a gate voltage of the second driving transistor may be the same as a gate voltage of the first driving transistor immediately before providing the first light emitting signal and the second light emitting signal.

In one embodiment, the display drive circuitry is configured to display the second display rolled into the housing while displaying the first image in the first display area and displaying the second image in the second display area. To identify that the second display area is exposed outside the housing by extending the area outside the housing and, in response to the identification, to drive each of the first pixels, the first light-emitting signal is transmitted according to the first period. and displaying a third image in the first display area and the second display area by providing the first light-emitting signal according to the first period to drive each of the second pixels. can be configured.

As described above, according to an embodiment, a method for operating an electronic device including a housing and a display panel rollable into the housing includes a first pixel in a first display area of the display panel exposed outside the housing. An operation of providing a first emission signal according to a first cycle in order to drive each of the pixels, and a second pixel in the second display area of the display panel rolled into the housing. 2 An operation of providing a light emitting signal according to a second period shorter than the first period, and displaying a first image in the first display area based on the first light emitting signal, while each of the first pixels In order to reduce a difference between a gate-source voltage of a first driving transistor for driving and a gate-source voltage of a second driving transistor for driving each of the second pixels, based on the second emission signal, the first driving transistor 2 may include an operation of displaying the second image within the display area.

Electronic devices according to various embodiments disclosed in this document may be devices 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. An electronic device according to an embodiment of the present document is not limited to the aforementioned devices.

Various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, like reference numbers may be used for like or related elements. The singular form of a noun corresponding to an item may include one item or a plurality of items, unless the relevant context clearly dictates 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 that phrase, or all possible combinations thereof. Terms such as "first", "second", or "first" or "secondary" may simply be used to distinguish that component from other corresponding components, and may refer to that component in other respects (eg, importance or order) is not limited. A (eg, first) component is said to be "coupled" or "connected" to another (eg, second) component, with or without the terms "functionally" or "communicatively." When mentioned, it means that the certain component may be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term "module" used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logical blocks, parts, or circuits. can be used as A module may be an integrally constructed component or a minimal unit of components or a portion thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of this document provide 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 (eg, the program 140) including them. For example, a processor (eg, the processor 120 ) of a device (eg, the electronic device 101 ) may call at least one command among one or more instructions stored from a storage medium and execute it. 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. The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' only means that the storage medium is a tangible device and does not contain a signal (e.g. electromagnetic wave), and this term refers to the case where data is stored semi-permanently in the storage medium. It does not discriminate when it is temporarily stored.

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

According to various embodiments, each component (eg, module or program) of the above-described components may include a single object or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. there is. According to various embodiments, one or more components or operations among the aforementioned 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 a single component. In this case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by a corresponding component of the plurality of components prior to the integration. . According to various embodiments, the actions performed by a module, program, or other component are executed sequentially, in parallel, iteratively, or heuristically, or one or more of the actions are executed in a different order, or omitted. or one or more other actions may be added.

Claims (20)

In an electronic device,
housing;
a display panel rollable into the housing; and
a display drive circuit operatively coupled with the display panel, the display drive circuit comprising:
Providing a first emission signal according to a first cycle to drive each of the first pixels in the first display area of the display panel exposed outside the housing;
providing a second light-emitting signal according to a second period shorter than the first period to drive each of second pixels in a second display area of the display panel rolled into the housing;
While displaying a first image in the first display area based on the first emission signal, the gate-source voltage of the first driving transistor for driving each of the first pixels and each of the second pixels configured to display a second image in the second display area based on the second light emitting signal to reduce a difference between a gate-source voltage of a second driving transistor for driving,
electronic device.
The method according to claim 1, wherein the first light-emitting signal,
With a first duty ratio,
The second light-emitting signal,
Having a second duty ratio smaller than the first duty ratio,
electronic device.
The method according to claim 2, wherein the second duty ratio,
set to be smaller than the first duty ratio to reduce power consumed for displaying the second image in the second display area rolled into the housing;
electronic device.
The method according to claim 2, wherein the size of the second duty ratio,
Based on the magnitude of the first duty ratio, identified,
electronic device.
The method according to claim 1, wherein the second display area,
a first subregion right next to a boundary between the first display area and the second display area and a second subregion next to the first subregion;
The display driving circuit,
providing the second light-emitting signal having a second duty ratio smaller than the first duty ratio of the first light-emitting signal according to the second period to drive each of the pixels in the first partial region;
providing a third light emitting signal having a third duty ratio smaller than the second duty ratio according to the second period to drive each of the pixels in the second partial region;
While the first image is displayed in the first display area based on the first light-emitting signal, a part of the second image is displayed in the first partial area based on the second light-emitting signal, Further configured to display a remaining part of the second image in the second partial area based on a third light emitting signal,
The second light-emitting signal,
Provided to reduce a difference between a gate-source voltage of the first driving transistor and a gate-source voltage of a driving transistor for driving each of the pixels in the first partial region;
The third light emitting signal,
Provided to reduce power consumed by the display of the second image,
electronic device.
The method according to claim 1, wherein the second display area,
a first subregion right next to a boundary between the first display area and the second display area and a second subregion next to the first subregion;
The display driving circuit,
providing the second emission signal according to the second cycle to drive each of the pixels in the first partial region;
To drive each of the pixels in the second partial region, a third emission signal is provided according to a third cycle longer than the second cycle,
While the first image is displayed in the first display area based on the first light-emitting signal, a part of the second image is displayed in the first partial area based on the second light-emitting signal, and the first light-emitting signal is displayed. 3 further configured to display the remaining part of the second image in the second partial area based on the light emitting signal;
The second light emitting signal,
Provided for reducing a difference between a gate-source voltage of the first driving transistor and a gate-source voltage of a driving transistor for driving each of the pixels in the first partial region;
The third light emitting signal,
Provided to reduce power consumed by the display of the second image,
electronic device.
The method according to claim 1, wherein the length of the second cycle,
Based on the length of the first period, identified,
electronic device.
The method according to claim 1, wherein the display driving circuit,
Based on identification that the first duty ratio of the first light-emitting signal is greater than or equal to the reference duty ratio, the first image is displayed in the first display area based on the first light-emitting signal provided according to the first period. display the second image within the second display area based on the second light emitting signal provided according to the second cycle and having a second duty ratio smaller than the first duty ratio;
Based on identification that the first duty ratio is smaller than the reference duty ratio, the first image is displayed in the first display area based on the first light emitting signal provided according to the first cycle, and the first Further configured to display the second image in the second display area based on the second light-emitting signal provided according to one cycle and having the second duty ratio,
electronic device.
The method according to claim 8, wherein the display driving circuit,
Based on identification that the first duty ratio is smaller than another reference duty ratio that is smaller than the reference duty ratio, the first image is generated based on the first light emitting signal provided according to the first period. display within a display area, and display the second image within the second display area based on the second light-emitting signal provided according to the first cycle and having the first duty ratio;
Based on the identification that the first duty ratio is less than the reference duty ratio and greater than the other reference duty ratio, the first image is displayed in the first display area based on the first emission signal provided according to the first period. To display the second image in the second display area based on providing the second light emitting signal having a second duty ratio smaller than the first duty ratio according to the first cycle, further made up,
electronic device.
The method of claim 1,
light sensor; and
further comprising a processor;
the processor,
In response to identifying that the brightness around the electronic device is less than the reference brightness through the illuminance sensor while displaying the first image in the first display area and displaying the second image in the second display area, , configured to transmit a designated signal to the display driving circuit,
The display driving circuit,
In response to receiving the designated signal from the processor, further configured to stop providing the second light-emitting signal.
electronic device.
The method of claim 1,
light sensor; and
further comprising a processor;
the processor,
In response to identifying that the brightness around the electronic device is less than the reference brightness through the illuminance sensor while displaying the first image in the first display area and displaying the second image in the second display area, , configured to transmit a designated signal to the display driving circuit,
The display driving circuit,
In response to receiving the designated signal from the processor, further configured to display the second image in the second display area at a maximum luminance lower than the designated luminance.
electronic device.
The method of claim 1,
light sensor; and
further comprising a processor;
The second display area,
a first subregion right next to a boundary between the first display area and the second display area and a second subregion next to the first subregion;
The second driving transistor,
used for the second partial area of the first partial area and the second partial area;
the processor,
In response to identifying that the brightness around the electronic device is less than the reference brightness through the illuminance sensor while displaying the first image in the first display area and displaying the second image in the second display area, , configured to transmit a designated signal to the display driving circuit,
The display driving circuit,
In response to receiving the designated signal from the processor, the second light-emitting signal is provided according to the second cycle to drive pixels in the second subregion of the first subregion and the second subregion; ,
While the first image is displayed in the first display area based on the first light-emitting signal, the second partial area of the first partial area and the second partial area based on the second light-emitting signal Further configured to display a part of the second image in
electronic device.
The method of claim 1,
light sensor; and
further comprising a processor;
The second display area,
a first subregion right next to a boundary between the first display area and the second display area and a second subregion next to the first subregion;
the processor,
In response to identifying that the brightness around the electronic device is less than the reference brightness through the illuminance sensor while displaying the first image in the first display area and displaying the second image in the second display area, , configured to transmit a designated signal to the display driving circuit,
The display driving circuit,
In response to receiving the designated signal from the processor, the second light-emitting signal is transmitted at a third period longer than the second period to drive pixels in the second subarea of the first subarea and the second subarea. provided according to the cycle;
While displaying the first image in the first display area based on the first light-emitting signal, the first partial area and the second part based on the second light-emitting signal provided according to the third period Further configured to display a portion of the second image within the second partial area of the area,
electronic device.
The method of claim 1,
light sensor; and
further comprising a processor;
The second display area,
a first subregion right next to a boundary between the first display area and the second display area and a second subregion next to the first subregion;
the processor,
In response to identifying that the brightness around the electronic device is less than the reference brightness through the illuminance sensor while displaying the first image in the first display area and displaying the second image in the second display area, , configured to transmit a designated signal to the display driving circuit,
The display driving circuit,
In response to receiving the designated signal from the processor, a duty ratio smaller than that of the second light emitting signal is set to drive pixels in the second subregion among the first subregion and the second subregion. Provides a third light emitting signal having a third light emitting signal according to the second cycle;
While the first image is displayed in the first display area based on the first light-emitting signal, the first partial area and the second part are provided based on the third light-emitting signal provided according to the second period. Further configured to display a portion of the second image within the second partial area of the area,
electronic device.
The method of claim 1,
grip sensor; and
further comprising a processor;
The display driving circuit,
While the electronic device is in a state in which the first display area is exposed outside the housing and the second display area is rolled into the housing, the first display area of the first display area and the second display area is further configured to display the first image within an area;
the processor,
Identifying that the electronic device is gripped through the grip sensor while displaying the first image in the first display area among the first display area and the second display area;
In response to the identification, identify history data about gate-source voltages of driving transistors for driving each of the pixels of the first display area disposed along the boundary between the first display area and the second display area. and the history data includes gate-source voltage values of the driving transistor in a time interval from the identified timing to a designated time before;
obtaining a third image for forming a gate-source voltage value of the second driving transistor higher than gate-source voltage values of the driving transistor, based on the history data; and
configured to transmit data for the third image to the display driving circuit;
The display driving circuit,
Further configured to display the third image in the second display area in response to receiving the data from the processor.
electronic device.
The method according to claim 15, wherein the third image,
Displayed in the second display area based on providing the second light-emitting signal according to the second cycle,
electronic device.
The method according to claim 15, wherein the processor,
configured to transmit other data for indicating a time interval for displaying the third image to the display driving circuit;
The display driving circuit,
In response to receiving the data and the other data, further configured to display the third image in the second display area during the time interval.
electronic device.
The method according to claim 1, wherein the gate voltage of the second driving transistor,
The same as the gate voltage of the first driving transistor before providing the first light-emitting signal and the second light-emitting signal,
electronic device.
The method according to claim 1, wherein the display driving circuit,
By extending the second display area rolled into the housing out of the housing while displaying the first image in the first display area and displaying the second image in the second display area, the image is displayed out of the housing. Identifying that the second display area is exposed;
In response to the identification, the first light-emitting signal is provided according to the first cycle to drive each of the first pixels, and the first light-emitting signal is provided to drive each of the second pixels. Further configured to display a third image in the first display area and the second display area by providing according to a first cycle,
electronic device.
A method for operating an electronic device comprising a housing and a display panel rollable into the housing, comprising:
providing a first emission signal according to a first cycle to drive each of the first pixels in the first display area of the display panel exposed outside the housing;
providing a second light-emitting signal according to a second period shorter than the first period to drive each of second pixels in a second display area of the display panel rolled into the housing;
While displaying a first image in the first display area based on the first emission signal, the gate-source voltage of the first driving transistor for driving each of the first pixels and each of the second pixels and displaying a second image in the second display area based on the second emission signal to reduce a difference between a gate-source voltage of a second driving transistor for driving.

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