Electronic paper device and operation method thereof

Abstract

Disclosed are an electronic paper device and an operation method thereof. The operation method of an electronic paper device may comprise the steps of: executing a bootloader on the basis of identifying that power is on; identifying a booting mode selected by the bootloader; loading an image in a storage only on the bootloader on the basis that the booting mode is a screen refresh mode; displaying the image on a screen; and turning off the electronic paper device.

Description

Electronic paper device and method of operation thereof

[0001] The present disclosure relates to an electronic paper device for refreshing a display screen and a method of operating the same.

[0002] E-paper displays are being utilized in various fields. Due to their nature, e-paper devices maintain an on-screen display even when the power is off; therefore, they remain powered off to reduce power consumption when there is no active activity. E-paper devices periodically refresh the screen to protect the display panel. However, power is consumed due to the computing resources used during device boot-up for this refresh process, and if the device uses a battery, the battery also drains rapidly. Furthermore, the numerous processes involved in booting take time, causing delays in screen refresh times, which can degrade the user experience. There is a need for a method to reduce power consumption and latency during the screen refresh process of e-paper devices, and to refresh the screen efficiently.

[0003] According to one aspect of the present disclosure, a method of operating an electronic paper device may be provided. The method may include the steps of executing a bootloader based on identifying power-on, identifying a boot mode selected in the bootloader, loading an image in storage using only the bootloader based on the boot mode being a screen refresh mode, displaying the image on a screen, and turning off the power of the electronic paper device.

[0004] According to one aspect of the present disclosure, an electronic paper device may be provided. The electronic paper device may include a system-on-chip comprising at least one processor, storage for storing instructions, a main memory in which said instructions are loaded, and a display for displaying content on a screen. By executing said instructions by the at least one processor in the system-on-chip, the electronic paper device may execute a bootloader based on identifying power-on, identify a boot mode selected in said bootloader, and based on said boot mode being a screen refresh mode, load an image in said storage into said main memory, display said image on said screen of said display, and turn off the power of said electronic paper device.

[0005] According to one aspect of the present disclosure, a computer-readable recording medium may be provided having a program recorded thereon for executing any one of the methods described above and below for operating an electronic paper device.

[0006] FIG. 1 is a drawing for exemplarily explaining the operation of an electronic paper device according to one embodiment of the present disclosure.

[0007] FIG. 2 is a flowchart for explaining the operation of an electronic paper device according to one embodiment of the present disclosure.

[0008] FIG. 3 is a diagram illustrating a screen refresh boot operation of an electronic paper device according to one embodiment of the present disclosure.

[0009] FIG. 4 is a diagram illustrating the operation of an electronic paper device according to one embodiment of the present disclosure displaying a plurality of images.

[0010] FIG. 5 is a diagram illustrating an operation that does not include a screen refresh boot mode of an electronic paper device according to one embodiment of the present disclosure.

[0011] FIG. 6 is a diagram illustrating the overall operation including a screen refresh boot mode of an electronic paper device according to one embodiment of the present disclosure.

[0012] FIG. 7 is a drawing for illustrating a storage that stores one or more images for screen refresh of an electronic paper device according to one embodiment of the present disclosure.

[0013] FIG. 8 is a diagram illustrating the operation of an electronic paper device according to one embodiment of the present disclosure that starts by acquiring user input.

[0014] FIG. 9 is a diagram illustrating the operation of an electronic paper device acquiring an image according to one embodiment of the present disclosure.

[0015] FIG. 10 is a block diagram illustrating the configuration of an electronic paper device according to one embodiment of the present disclosure.

[0016] The terms used in this specification will be briefly explained, and the present disclosure will be described in detail. In the present disclosure, the expression "at least one of a, b, or c" may refer to "a," "b," "c," "a and b," "a and c," "b and c," "all of a, b, and c," or variations thereof.

[0017] The terms used in this disclosure have been selected to be as widely used and general as possible, taking into account their functions within this disclosure; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been selected at the applicant's discretion, and in such cases, their meanings will be described in detail in the relevant explanatory sections. Therefore, terms used in this disclosure should be defined not merely by their names, but based on their meanings and the overall content of this disclosure.

[0018] Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as generally understood by those skilled in the art as described in this specification. Additionally, terms including ordinal numbers, such as "first" or "second," used in this specification may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another.

[0019] When a part of a specification is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "part" or "module" as used in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware or software, or as a combination of hardware and software.

[0020] Embodiments of the present disclosure are described below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, parts unrelated to the description have been omitted from the drawings to clearly explain the present disclosure. Additionally, for convenience of explanation, different reference numbers have been used throughout the specification even for identical components.

[0021] The present disclosure will be described below with reference to the attached drawings.

[0022] FIG. 1 is a drawing for exemplarily explaining the operation of an electronic paper device according to one embodiment of the present disclosure.

[0023] In one embodiment, the electronic paper device (1000) may include various types of devices including an electronic paper display. For example, the electronic paper device (1000) may include a large electronic paper display, digital signage, an e-book reader, a smart display, an electronic notepad, etc., but is not limited thereto.

[0024] In one embodiment, the electronic paper device (1000) may display content (100) using electronic ink technology. The display of the electronic paper device (1000) has characteristics different from those of a typical LCD or OLED display. In other words, while displays such as LCD or OLED displays are suitable for displaying high-resolution video or color-rich content, the electronic paper device (1000) has characteristics suitable for displaying text-based content or simple graphic content with limited colors. Accordingly, the content (100) displayed on the screen of the electronic paper device (1000) may be static content. For example, the content (100) may include, but is not limited to, advertisements, menus, price lists, signs, news articles, etc., containing at least one of text or images.

[0025] In one embodiment, static content (100) displayed on the screen of an electronic paper device (1000) can be displayed and maintained even when the power of the electronic paper device (1000) is turned off. The electronic paper device (1000) can set the positions of electronic ink particles by applying voltage to the pixels of the display to display the content (100). Once the positions of the electronic ink particles are set, the positions of the particles are maintained even when the voltage applied to the display is removed, so that the content (100) can continue to be displayed.

[0026] When content (100) is displayed for a long time on an electronic paper device (1000), the electronic ink particles may move slightly or become unstable as time passes. Alternatively, problems such as particles becoming fixed may occur as the electronic ink particles are maintained for a long time. The electronic paper device (1000) can ensure that the positions of the electronic ink particles are accurately readjusted through screen refresh. For example, the electronic paper device (1000) can initialize the positions of the electronic ink particles by controlling the voltage applied to the pixels of the display through a screen refresh operation.

[0027] The electronic paper device (1000) can periodically refresh the screen. Screen refreshing may include updating the content displayed on the display screen of the electronic paper device (1000), or initializing the screen and re-displaying the content to maintain the content displayed on the display screen.

[0028] In one embodiment, the screen refresh operation of the electronic paper device (1000) can be performed using only the bootloader (110). When the power of the electronic paper device (1000) is turned on, booting is initiated by the bootloader (110), the operating system (120) is executed, and system applications, application applications, etc. running on the operating system are executed. To improve the consumption of power and the time required due to computing resources used when the operating system (120) is executed, the electronic paper device (1000) can create and use a screen refresh boot mode that enables screen refreshing using only the bootloader (110) without executing the operating system (120). By using the screen refresh boot mode, the electronic paper device (1000) can periodically perform the screen refresh operation of the electronic paper device (1000) to protect the panel of the electronic paper display from burn-in, afterimage effects, etc. In addition, the electronic paper device (1000) can reduce the power consumed and the time required during screen refresh operation by using a screen refresh boot mode.

[0029] The specific operations of the electronic paper device (1000) setting a screen refresh boot mode and refreshing the screen using only the bootloader (110) will be described in more detail through the drawings and descriptions therefor.

[0030] FIG. 2 is a flowchart for explaining the operation of an electronic paper device according to one embodiment of the present disclosure.

[0031] In operation S210, the electronic paper device (1000) can execute a bootloader based on power-on being identified.

[0032] In one embodiment, the electronic paper device (1000) can identify power-on. Power-on may be achieved by user input to the electronic paper device (1000). For example, power-on may mean that power supply is started in response to a physical button of the electronic paper device (1000) being pressed, or in response to receiving an activation command from an external device connected to the electronic paper device (1000) while the electronic paper device (1000) is in standby mode in low power mode. Alternatively, power-on may include the electronic paper device (1000) itself identifying a pre-set time elapsed by a timer while the electronic paper device (1000) is in standby mode in low power mode and initializing the system for screen refresh.

[0033] When the power-on of the electronic paper device (1000) is identified and the system is initialized, the device may execute a bootloader to start booting processes. The bootloader of the electronic paper device (1000) may include a function to load an image without executing an operating system. Various types of bootloaders capable of providing an image loading function may be adopted. The bootloader may be, for example, U-Boot, but is not limited thereto.

[0034] In operation S220, the electronic paper device (1000) can identify the boot mode selected in the bootloader.

[0035] In one embodiment, the electronic paper device (1000) may have various types of boot modes configured. The boot modes may include, for example, a normal boot mode and a screen refresh boot mode, but are not limited thereto. A normal boot mode may refer to a mode in which the electronic paper device (1000) is started by using the bootloader of the electronic paper device (1000) to execute an operating system (OS) stored in storage and load applications so that the system can perform operations at the application level. A screen refresh boot mode may refer to a mode in which the electronic paper device (1000) is started to perform only screen refresh operations using only the bootloader without executing the operating system of the electronic paper device (1000).

[0036] In one embodiment, the selection of the boot mode may be determined by a pre-set condition. For example, when the electronic paper device (1000) is booted by user input, the boot mode may be selected as a normal boot mode. Specifically, when the user boots the electronic paper device (1000) through physical key input, a remote boot command, etc., the boot mode may be selected as a normal boot mode. Additionally, for example, the electronic paper device (1000) may be automatically booted at pre-set time intervals using a timer. In this case, since the boot is for screen refresh rather than booting by user input, the boot mode may be selected as a screen refresh boot mode.

[0037] In operation S230, the electronic paper device (1000) can load an image in storage using only a bootloader, based on the fact that the boot mode is a screen refresh mode.

[0038] In one embodiment, when the boot mode is a screen refresh mode, the electronic paper device (1000) may skip the process of starting an operating system. After the system initialization task required for booting (e.g., hardware initialization, etc.) is performed, the electronic paper device (1000) may load an image from storage using the image loading function of the bootloader.

[0039] The electronic paper device (1000) can select a specific partition (e.g., a screen refresh partition) within storage to load an image. One or more images may be stored in the partition. The electronic paper device (1000) can read image data from the partition and load the image data into main memory.

[0040] In operation S240, the electronic paper device (1000) can display an image on a screen. The electronic paper device (1000) can transmit image data loaded in the main memory to a display panel (e.g., using SPI communication, etc.) so that the image is displayed on the display screen. The display of the electronic paper device (1000) can render an image by transmitting electrical stimulation to electronic ink particles corresponding to each pixel for each pixel. The electronic paper device (1000) may be configured to include an electronic paper display panel of a type capable of displaying black and white or color content.

[0041] In operation S250, the electronic paper device (1000) can turn off the power of the electronic paper device (1000).

[0042] The electronic paper device (1000) can remove the voltage and maintain the display state once the image display is complete. Power off may include not only completely removing the power of the electronic paper device (1000), but also entering a low-power mode to maintain minimal operation of the electronic paper device (1000). For example, power off may be to turn off only the power of the main board, which includes the CPU, memory, display controller, etc. of the electronic paper device (1000). Even when the power of the electronic paper device (1000) is off, the electronic ink particles of the electronic paper device (1000) remain in a stable state, so the displayed image can continue to be maintained on the screen of the electronic paper device (1000).

[0043] In one embodiment, the electronic paper device (1000) may repeat power on / off for screen refresh at preset times. The preset times may be predefined in various ways. For example, if a single image is continuously maintained and displayed on the electronic paper device (1000), the preset time may be a relatively long time (e.g., 12 hours). Also, for example, if a new image is displayed while the screen is refreshed on the electronic paper device (1000), the preset time may be a relatively short time (e.g., 5 minutes, 10 minutes, etc.). If the electronic paper device (1000) displays multiple images through screen refresh, the screen refresh cycle and the order in which the multiple images are displayed may be predefined and may be adjusted by user input.

[0044] The electronic paper device (1000) can prevent image afterimages or burn-in on the electronic paper display while minimizing power consumption by using a screen refresh boot mode that uses only a bootloader.

[0045] FIG. 3 is a diagram illustrating a screen refresh boot operation of an electronic paper device according to one embodiment of the present disclosure.

[0046] In one embodiment, the electronic paper device (1000) can repeat power on / off for screen refresh at preset time intervals. Power on / off for screen refresh can be performed using only a bootloader without executing an operating system.

[0047] In operation S310, the electronic paper device (1000) can perform a screen refresh. The screen refresh operation of the electronic paper device (1000) can be initiated by the electronic paper device (1000) entering a screen refresh boot mode, which is a boot mode configured to perform only a screen refresh. When the power-on of the electronic paper device (1000) is identified and booting begins, the electronic paper device (1000) can identify a boot mode selected by a bootloader.

[0048] When an image is displayed for a long time on an electronic paper device (1000), the electronic ink particles may move slightly or become unstable as time passes. Alternatively, problems such as the particles becoming fixed may occur as the electronic ink particles are maintained for a long time. The electronic paper device (1000) can ensure that the positions of the electronic ink particles are accurately readjusted through screen refresh. For example, the electronic paper device (1000) can initialize the positions of the electronic ink particles by controlling the voltage applied to the pixels of the display through a screen refresh operation.

[0049] In operation S320, the electronic paper device (1000) can display an image.

[0050] In one embodiment, the screen refresh operation of the electronic paper device (1000) begins when the electronic paper device (1000) boots into a screen refresh boot mode. The electronic paper device (1000) can load an image to be displayed on the screen by using the image loading function of the bootloader. In this case, the bootloader can identify a pre-configured partition (e.g., a screen refresh partition) within the storage. One or more images for screen refresh may be stored in the pre-configured partition. The electronic paper device (1000) can load an image from the pre-configured partition within the storage and display the image on the screen.

[0051] In one embodiment, the image displayed in operation S320 may be the same image as the previously displayed image. In one embodiment, the image displayed in operation S320 may be a different image from the previously displayed image. For example, one or more images may be stored in a partition within storage, and different images may be displayed on the screen each time a screen refresh is performed. In one embodiment, the image displayed on the electronic paper device (1000) may include a black and white image and a color image.

[0052] In one embodiment, the screen refresh operation (S310) of the electronic paper device (1000) may be included in the image display operation (S320). That is, when the electronic paper device (1000) starts booting in a screen refresh boot mode and displays an image, voltage is applied to the pixels of the display to display the image, so the operation of displaying the image itself may mean that the screen refresh operation is performed.

[0053] In operation S330, the electronic paper device (1000) may turn off its power. Since power is not required after an image is displayed on the screen of the electronic paper device (1000), the electronic paper device (1000) may turn off its power to save power. Turning off the power may include not only completely turning off the power of the electronic paper device (1000), but also turning off only the power of the main board of the electronic paper device (1000) to switch to a low-power mode. Even when the power is turned off, the state of the electronic ink particles is maintained, so the image output in operation S320 can be maintained on the screen of the electronic paper device (1000).

[0054] In operation S340, the electronic paper device (1000) may turn on the power after a preset time has elapsed. The preset time may be, for example, a time defined for protecting the display panel of the electronic paper device (1000). For example, the preset time for continuously displaying one image and performing a screen refresh while maintaining the image may be 12 hours, but is not limited thereto. When the power is turned on, a screen refresh boot mode is selected by the bootloader, and operations S310 through S330 may be repeated.

[0055] Meanwhile, operations S310 to S340 are performed by the electronic paper device (1000) using only a bootloader without executing an operating system. When the electronic paper device (1000) is turned off and then on to display an image on the screen, it can minimize the power consumption of the electronic paper device (1000) by using a boot mode configured to perform only a screen refresh.

[0056] FIG. 4 is a diagram illustrating the operation of an electronic paper device according to one embodiment of the present disclosure displaying a plurality of images.

[0057] In one embodiment, the electronic paper device (1000) can change the image displayed on the electronic paper device (1000) while refreshing the screen.

[0058] For example, the first screen refresh (410) operation may include power on, screen refresh, and power off. By the first screen refresh (410), image A (412) may be displayed on the screen of the electronic paper device (1000). The electronic paper device (1000) may turn on the power of the electronic paper device (1000) using the screen refresh boot mode, display image A (412), and then turn off the power. Image A (412) may be stored in a partition within storage accessible when the electronic paper device (1000) is booted using the screen refresh boot mode. When the power is turned off, image A (412) may remain on the screen of the electronic paper device (1000).

[0059] After the first screen refresh (410) operation is performed and a preset time has elapsed, the second screen refresh (420) operation may be performed. The second screen refresh (420) operation may include power on, screen refresh, and power off. By the second screen refresh (420), image B (422) may be displayed on the screen of the electronic paper device (1000). The second screen refresh (420) operation may be performed by checking the time elapsed after the first screen refresh (410) is performed using a timer, and when the preset time has elapsed. The preset time is a time set to change the displayed image, and may be, for example, 5 minutes, 10 minutes, etc., but is not limited thereto. When the preset time has elapsed after the first screen refresh (410) is performed, the electronic paper device (1000) may automatically turn on the power and perform the second refresh (420) operation. When the electronic paper device (1000) is automatically turned on, the boot mode may be selected as a screen refresh boot mode. The electronic paper device (1000) may turn on the power of the electronic paper device (1000) using the refresh boot mode, display image B (422), and then turn off the power. Image B (422) may be stored in a partition within the storage accessed by the bootloader during screen refresh boot. When the power is turned off, image B (422) may remain on the screen of the electronic paper device (1000).

[0060] The third screen refresh (430) operation may be performed after a preset time has elapsed following the second refresh (420) operation. The third screen refresh (430) operation may include power on, screen refresh, and power off. Image C (432) may be stored in a partition within storage accessed by the bootloader during screen refresh booting, and Image C (432) may be displayed on the screen of the electronic paper device (1000) by the third screen refresh (430).

[0061] By the method described above, the electronic paper device (1000) can change images by repeatedly performing refresh operations. For example, if there are N images to be displayed, the electronic paper device (1000) can perform screen refresh operations including power on / off at a preset time interval. When the Nth screen refresh operation is performed to display the Nth image, Image N, a first screen refresh operation (410) can be performed again to display the first image, Image A.

[0062] In one embodiment, the electronic paper device (1000) may receive user input specifying at least one of a display cycle (e.g., 5 minutes, 10 minutes, etc.) and a display order for displaying a plurality of images through screen refresh.

[0063] Meanwhile, the screen refresh operations described in FIG. 4 are performed by the electronic paper device (1000) using only a bootloader without executing an operating system. When the electronic paper device (1000) is turned off and then on to display an image on the screen, it uses a boot mode configured to perform only screen refresh, thereby minimizing the power consumption of the electronic paper device (1000) and improving processing speed by omitting unnecessary boot processes when changing and displaying an image.

[0064] FIG. 5 is a diagram illustrating an operation that does not include a screen refresh boot mode of an electronic paper device according to one embodiment of the present disclosure.

[0065] In one embodiment, the MCU (510) of the electronic paper device (1000) can identify power-on and activate the CPU. When the CPU is activated, the bootloader (520) can be started. If the electronic paper device (1000) does not use a screen refresh boot mode, the electronic paper device (1000) is booted into a normal boot mode, the operating system (530) is executed, and a series of processes included in booting, such as kernel startup, driver startup, and application startup, can be performed. Since each process can correspond to a known boot process of a known general device, a detailed description is omitted.

[0066] The operating system (530) can start an application and load one or more images. One or more images may be loaded into main memory from an external storage medium recognized by the system and physically connected to the electronic paper device (1000), or received and loaded from a server connected to the electronic paper device (1000). Alternatively, images stored in the internal storage of the electronic paper device (1000) may be loaded.

[0067] The operating system (530) can enable a loaded image to be displayed on the screen of the electronic paper device (1000). One or more images may be displayed on the screen of the electronic paper device (1000). For example, a single image may be displayed on a single screen of the electronic paper device (1000), or multiple images may be displayed on a single screen of the electronic paper device (1000). The image displayed on the electronic paper device (1000) may be changed.

[0068] The electronic paper device (1000) can turn off the power after displaying an image, activate the CPU after checking the screen refresh time by the MCU (510), and perform screen refresh (image display) processes again by the bootloader (520) and the operating system (530). The electronic paper device (1000) can repeat the operation of turning on the power to refresh the screen and turning off the power at preset times.

[0069] Meanwhile, the embodiment of FIG. 5 does not utilize a dedicated boot mode solely for screen refresh. That is, the operating system (530) is executed at every boot to perform boot processes such as kernel startup, driver startup, and application startup, and to display an image. When the purpose of booting the electronic paper device (1000) is to boot for screen refresh, it is necessary to reduce power consumption and processing speed by omitting unnecessary processes included during booting and performing minimal operations solely for screen refresh. Therefore, to optimize power consumption and processing speed, the electronic paper device (1000) may set a screen refresh boot mode, which is a dedicated mode for screen refresh, while the operating system (530) is running. In the screen refresh boot mode, booting is performed only by the bootloader (520), and the execution of the operating system (530) may be omitted. An embodiment in which the electronic paper device (1000) sets and uses the screen refresh boot mode is further described with reference to FIG. 6.

[0070] FIG. 6 is a diagram illustrating the overall operation including a screen refresh boot mode of an electronic paper device according to one embodiment of the present disclosure.

[0071] In describing FIG. 6, to explain how the electronic paper device (1000) sets the screen refresh boot mode, the situation in which the electronic paper device (1000) is first booted and started by user input is described.

[0072] In one embodiment, the electronic paper device (1000) may be booted by user input. The user input for booting the electronic paper device (1000) may be pressing a physical power button or receiving it remotely via a remote control or an application on an external device (e.g., a smartphone).

[0073] In one embodiment, the MCU (610) of the electronic paper device (1000) can identify power-on. When the MCU (610) identifies that power is being supplied normally, it can activate the CPU.

[0074] When the CPU is activated, the CPU can start the bootloader (620). The bootloader (620) can be executed using only a single core of the CPU. When the bootloader (620) starts the booting processes, the bootloader (620) can select a boot mode. When the power of the e-paper device (1000) is turned on by user input, the bootloader (620) can enter a normal boot mode. When the boot mode is selected as a normal boot mode, the bootloader (620) can load the kernel of the operating system (630). Additionally, when the e-paper device (1000) turns on itself for screen refresh without user input, the bootloader (620) can enter a screen refresh boot mode. Below, the entry into the normal boot mode is described first. The e-paper device (1000) can set the screen refresh boot mode while operating by booting into the normal boot mode.

[0075] The operating system (630) can take over the boot process of the electronic paper device (1000). The operating system (630) can start the loaded kernel to initialize memory, processor-related settings, basic processes, schedulers, etc. The operating system (630) can be executed using the multi-cores of the CPU. The operating system (630) can start a driver for the kernel to interact with the hardware elements of the electronic paper device (1000). Once the driver loading and the initialization of the electronic paper device (1000) are completed, the operating system (630) can start an application. The application may be a program for displaying one or more images on the electronic paper device (1000). However, not only an application for displaying images on the electronic paper device (1000) is executed, but various system applications and application applications for implementing general functions of the electronic paper device (1000) may be executed.

[0076] The operating system (630) can start an application and load one or more images. One or more images may be loaded from an external storage medium recognized by the system and physically connected to the e-paper device (1000), or received and loaded from a server connected to the e-paper device (1000) via a wired connection (e.g., Ethernet), a wireless connection (e.g., Wi-Fi), or a communication protocol (e.g., HTTPS). Alternatively, images stored in the internal storage of the e-paper device (1000) may be loaded.

[0077] The operating system (630) can enable a loaded image to be displayed on the screen of the electronic paper device (1000). One or more images may be displayed on the screen of the electronic paper device (1000). For example, a single image may be displayed on a single screen of the electronic paper device (1000), or multiple images may be displayed on a single screen of the electronic paper device (1000). The image displayed on the electronic paper device (1000) may be changed.

[0078] In one embodiment, when the electronic paper device (1000) is booted into a normal boot mode by user input, the electronic paper device (1000) can set a boot mode for screen refresh while the operating system (630) is running. For example, the electronic paper device (1000) can save a boot mode to be selected later as a screen refresh boot mode. If a screen refresh boot mode does not exist in the boot modes, the electronic paper device (1000) can create a screen refresh boot mode and save the setting values.

[0079] In one embodiment, the electronic paper device (1000) may store one or more images in a screen refresh partition. For example, the electronic paper device (1000) may store one or more images loaded from an external storage medium or a server in the screen refresh partition. If the screen refresh partition does not exist during the initial setup phase of the electronic paper device (1000), the electronic paper device (1000) may create a new partition within storage and designate it as the screen refresh partition. The screen refresh partition may be configured to be accessible by a bootloader in screen refresh boot mode.

[0080] In one embodiment, the electronic paper device (1000) may receive user input specifying at least one of a display cycle (e.g., 5 minutes, 10 minutes, etc.) and a display order for displaying multiple images through screen refresh. When the electronic paper device (1000) stores one or more images in a screen refresh partition, it may store information regarding the display cycle and display order for displaying multiple images together. Alternatively, the electronic paper device (1000) may store one or more images based on a pre-set rule. For example, the order in which the electronic paper device (1000) reads images from an external storage medium or server may be the order in which images are displayed during a screen refresh operation. Also, for example, the screen refresh cycle may be determined based on a pre-defined refresh time. For example, when performing screen refresh with multiple different images, the refresh time may be defined as a relatively short time, such as 5 minutes or 10 minutes. In addition, for example, when performing a screen refresh with only one image, it can be defined as a relatively long time, such as 12 hours or 24 hours. In other words, the refresh time can be optimized according to the image display method.

[0081] The operating system (630) can turn off the power of the electronic paper device (1000) after saving the boot mode of the electronic paper device (1000) to a screen refresh boot mode and saving one or more images to a screen refresh partition. For example, the operating system (630) can send a signal to the MCU (610) to turn off the power of the main board of the electronic paper device (1000) and maintain the displayed image in a low-power standby state.

[0082] In one embodiment, the MCU (610) can check the screen refresh time using a built-in timer. The MCU (610) can identify when a preset time has elapsed after the power of the electronic paper device (1000) is turned off. When the preset time has elapsed, the MCU (610) can activate the CPU to boot the electronic paper device (1000).

[0083] The booting of the electronic paper device (1000) by the timer of the MCU (610) is a booting performed by the electronic paper device (1000) itself without intervention by separate user input. In this case, since the boot mode of the electronic paper device (1000) is stored as a screen refresh boot mode while the operating system (630) is running during the operation of the previous electronic paper device (1000), the electronic paper device (1000) can enter a screen refresh boot mode for screen refresh using only the bootloader (620).

[0084] The bootloader (620) can boot the e-paper device (1000) into a screen refresh boot mode and load and display an image from a refresh partition within the storage. The bootloader may be a type of bootloader that provides image loading and display functions. When the image display operation is completed, the bootloader (620) can turn off the power of the e-paper device (1000). For example, the bootloader (620) can send a signal to the MCU (610) to turn off the power of the main board of the e-paper device (1000) and maintain the displayed image in a low-power standby state.

[0085] The electronic paper device (1000) can repeat power on / off for screen refresh at preset intervals using only the bootloader (620). While the electronic paper device (1000) is repeating power on / off for screen refresh, if the electronic paper device (1000) is powered on by user input, the bootloader (620) can select a boot mode as a normal boot mode. In this case, the electronic paper device (1000) can boot back into normal boot mode and perform normal operations.

[0086] FIG. 7 is a drawing for illustrating a storage that stores one or more images for screen refresh of an electronic paper device according to one embodiment of the present disclosure.

[0087] In one embodiment, the electronic paper device (1000) may include storage. The storage may store elements necessary for booting and operating the electronic paper device (1000). For example, the storage may store a bootloader, kernel, DTB (Device Tree Blob), application, boot mode information, etc., but is not limited thereto.

[0088] The bootloader can initialize hardware components, select a boot mode, and load the kernel. Various types of bootloaders capable of providing image loading capabilities without executing an operating system may be adopted. The bootloader may be, for example, U-Boot, but is not limited thereto.

[0089] The kernel can be responsible for functions such as hardware management, system process management, and memory management. The DTB transmits hardware information, such as CPU and memory, to the kernel so that the kernel can initialize the hardware of the electronic paper device (1000). The kernel and the DTB are core elements of the operating system and may vary depending on the type of operating system. The operating system may be, for example, Tizen, but is not limited thereto.

[0090] The boot mode may include information regarding the boot options of the electronic paper device (1000). For example, Power Key On indicates a boot mode when the power is turned on by pressing a physical button of the electronic paper device (1000) (e.g., normal boot mode), and Network Wake Up indicates a boot mode when an activation command is received from an external device connected to the electronic paper device (1000) (e.g., normal boot mode). Additionally, Refresh Wake Up indicates a boot mode when the electronic paper device (1000) itself identifies the elapsed time set by a timer and initializes the system for screen refresh (e.g., screen refresh boot mode).

[0091] One or more images (e.g., Image A, Image B, Image C, etc.) to be displayed when the electronic paper device (1000) is booted into screen refresh boot mode by the bootloader may be stored in the screen refresh partition (700). When booting into screen refresh boot mode, the bootloader may access the screen refresh partition (700) and load one or more images stored in the screen refresh partition (700) into main memory.

[0092] In one embodiment, the electronic paper device (1000) may receive user input specifying at least one of a display cycle (e.g., 5 minutes, 10 minutes, etc.) and a display order for displaying a plurality of images through screen refresh. When the electronic paper device (1000) stores one or more images in a screen refresh partition, it may store information regarding the display cycle and display order for displaying the plurality of images together.

[0093] In one embodiment, the electronic paper device (1000) is powered on for refresh booting and enters a refresh boot mode, but the screen refresh partition (700) does not exist or valid data (e.g., images) is not stored in the screen refresh partition (700). In this case, the electronic paper device (1000) may enter a normal boot mode in which an operating system is executed, create a screen refresh partition (700), and perform a refresh boot mode setting operation to store one or more images in the screen refresh partition (700). Since this has been described above in the description of FIG. 6, a repeated description is omitted.

[0094] FIG. 8 is a diagram illustrating the operation of an electronic paper device according to one embodiment of the present disclosure that starts by acquiring user input.

[0095] The electronic paper device (1000) can be powered on based on user input.

[0096] In one embodiment, the electronic paper device (1000) may be powered on based on direct user input to the electronic paper device (1000). For example, the electronic paper device (1000) may be powered on based on user input of pressing a physical button (810). The electronic paper device (1000) may enable the MCU to be activated based on a signal from the physical button (810). Alternatively, the electronic paper device (1000) may be powered on based on user input of touching the screen. The electronic paper device (1000) may enable the MCU to be activated based on a touch signal from a touch sensor. Alternatively, the electronic paper device (1000) may be executed based on a voice command. The electronic paper device (1000) may enable the MCU to be activated in response to a user's voice command based on a voice recognition system including a microphone and a voice recognition engine.

[0097] In one embodiment, the electronic paper device (1000) may be powered on based on indirect user input to the electronic paper device (1000). For example, the electronic paper device (1000) may receive user input from an external device (820) capable of communicating with the electronic paper device (1000). For example, the electronic paper device (1000) may enable the MCU to be activated based on a remote control input signal. Alternatively, the electronic paper device (1000) may receive a power-on command via a smartphone (e.g., a smartphone application, a voice command, etc.) or a power-on command via a server (e.g., a server receiving a power-on command from a user device and responding, etc.). The electronic paper device (1000) may enable the MCU to be activated based on a signal corresponding to the power-on command from the external device.

[0098] In one embodiment, when the electronic paper device (1000) is powered on by user input, the electronic paper device (1000) boots into a normal boot mode and runs an operating system.

[0099] While the operating system is running with the boot mode selected as normal boot mode, the electronic paper device (1000) can set the boot mode of the electronic paper device (1000) to screen refresh mode. Setting the boot mode to screen refresh mode may include processes such as starting an application to load and display an image, saving the boot mode to screen refresh boot mode, and creating a screen refresh partition to save the image. Since this has been explained in detail in the description of FIG. 6, a repetitive explanation is omitted for brevity.

[0100] When the screen refresh mode setting of the electronic paper device (1000) is completed, the power of the electronic paper device (1000) can be turned off. After the power of the electronic paper device (1000) is turned off, the MCU can identify the elapsed time of a preset time using a timer and repeat the power on / off for screen refresh. The power on / off for screen refresh can be performed only by the bootloader in the screen refresh boot mode without the execution of an operating system. The screen refresh boot mode may include a process of loading and displaying an image from the refresh partition using the function of the bootloader and turning off the power of the electronic paper device (1000). Since this has been explained in detail in the description of FIG. 6, a repeated explanation is omitted for brevity.

[0101] FIG. 9 is a diagram illustrating the operation of an electronic paper device acquiring an image according to one embodiment of the present disclosure.

[0102] In one embodiment, the electronic paper device (1000) can acquire one or more images (900) from an external device. The external device may include, but is not limited to, a server (910), an external storage medium (920), and a smartphone (930), and may include any type of device capable of providing images to the electronic paper device (1000).

[0103] For example, the electronic paper device (1000) can receive one or more images (900) from a server (910). For example, the electronic paper device (1000) can recognize an external storage medium (920) (e.g., a USB device) and identify one or more images (900) stored in the external storage medium (920). Or, for example, the electronic paper device (1000) can receive one or more images (900) from a smartphone (930).

[0104] When an electronic paper device (1000) is booted into a normal boot mode and an application for displaying images is executed through an operating system, the application can process one or more images (900). The application can cause one or more images (900) to be displayed on the screen of the electronic paper display (1000). After one or more images (900) are displayed on the electronic paper device (1000), a screen refresh mode setting process may be performed. The screen refresh mode setting process may include processes for saving the boot mode as a screen refresh boot mode and creating a screen refresh partition to store images to be displayed in the screen refresh mode. Since this has been explained in detail in the description of FIG. 6, a repetitive explanation is omitted for brevity.

[0105] In one embodiment, the electronic paper device (1000) may receive user input specifying at least one of a display cycle (e.g., 5 minutes, 10 minutes, etc.) and a display order for displaying one or more images (900) through a screen refresh. The electronic paper device (1000) may store information regarding the display cycle and display order for displaying images together with one or more images (900) in a screen refresh partition.

[0106] FIG. 10 is a block diagram illustrating the configuration of an electronic paper device according to one embodiment of the present disclosure.

[0107] In one embodiment, the electronic paper device (1000) may include a system-on-chip (1100), a main memory (1200), a storage (1300), and a display (1400).

[0108] The system-on-chip (1100) can control the overall operations of the electronic paper device (1000). The system-on-chip (1100) may include processing circuits. The processing circuits included in the system-on-chip (1100) may be, for example, an MCU (1110) and a CPU (1120), but are not limited thereto. For example, the system-on-chip (1100) may be composed of at least one of a Graphic Processing Unit (GPU), Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), and an Application Processor (AP), but are not limited thereto.

[0109] The main memory (1200) can store data currently being processed in the electronic paper device (1000). The main memory (1200) can store programs and data currently being executed by the MCU (1110) or CPU (1120) of the system-on-chip (1100) and allow for fast access. The main memory (1200) may include volatile memory such as RAM (Random Access Memory) or SRAM (Static Random Access Memory), but is not limited thereto.

[0110] Storage (1300) can permanently store large amounts of data (e.g., programs, system files, etc.). Storage (1300) may include non-volatile memory including at least one of, for example, a hard disk drive (HDD), a solid-state drive (SSD), an optical drive (e.g., a CD), a flash drive, a ROM (Read-Only Memory), an EEPROM (Electrically Erasable Programmable Read-Only Memory), and a PROM (Programmable Read-Only Memory), but is not limited thereto.

[0111] The display (1400) can display content such as images and text on the screen. The display may include displays implementing various types of electronic paper (e-Paper) technology, such as an electrophoretic display (EPD) and a color electronic paper display (Color EPD), but is not limited thereto.

[0112] In one embodiment, the electronic paper device (1000) may include an input interface. The input interface may be an interface that supports an external storage medium, such as a USB, MicroSD / SD card, for example, but is not limited thereto.

[0113] In one embodiment, the electronic paper device (1000) may include a battery. The battery may include various types of rechargeable batteries capable of supplying power to the electronic paper device. For example, the battery may include a lithium-ion battery (Li-Ion), a lithium-polymer battery (Li-Po), etc., but is not limited thereto.

[0114] Meanwhile, although FIG. 10 exemplarily describes a system-on-chip (1100) including an MCU (1110) and a CPU (1120), the configuration of the system-on-chip (1100) of the electronic paper device (1000) is not limited thereto. For example, the MCU (1110) and the CPU (1120) may each be implemented as different chips.

[0115] In one embodiment, the electronic paper device (1000) may boot into a screen refresh boot mode to perform only screen refresh. In one embodiment, the MCU (1110) may check the screen refresh time using a built-in timer. The MCU (1110) may identify that a preset time has elapsed after the power of the electronic paper device (1000) is turned off. When the preset time has elapsed, the MCU (1110) may activate the CPU (1120) to boot the electronic paper device (1000). In this case, the bootloader of the electronic paper device (1000) may boot into a screen refresh boot mode. In the screen refresh boot mode, a screen refresh operation may be performed using only the bootloader without the execution of an operating system, and only a single core of the CPU (1120) may be utilized.

[0116] In one embodiment, the electronic paper device (1000) can boot into a normal boot mode. The normal boot mode can be started by power-on via user input, and the electronic paper device (1000) can use a bootloader to start a kernel and run an operating system. In the normal boot mode where the operating system runs, a screen refresh boot mode for screen refresh booting of the electronic paper device (1000) can be set.

[0117] In one embodiment, the processor of the electronic paper device (1000) may be one or more. For example, the electronic paper device (1000) may include additional processors in addition to the system-on-chip (1100) described above, and one or more processors may also be included within the system-on-chip (1100) described above. If there is one or more processors, the operations of the present disclosure may be performed by one or more processors by executing instructions and / or programs stored in memory individually or collectively. If the method according to one embodiment of the present disclosure includes a plurality of operations, the plurality of operations may be performed by a single processor or by a plurality of processors.

[0118] For example, when the first, second, and third operations are performed by a method according to one embodiment, the first, second, and third operations may all be performed by the first processor, and some of the first to third operations may be performed by the first processor (e.g., CPU (1120)) and the remaining operations may be performed by the second processor (e.g., MCU (1110)). Here, the overall operations of the electronic paper device (1000) may be performed by the CPU (1120), which is an example of the first processor, and the time check for screen refresh and power on / off may be managed by the MCU (1110), which is an example of the second processor. However, the embodiments of the present disclosure are not limited thereto.

[0119] One or more processors according to the present disclosure may be implemented as a single-core processor or as a multi-core processor. If a method according to one embodiment of the present disclosure includes a plurality of operations, the plurality of operations may be performed by a single core. For example, operations in a screen refresh boot mode using only a bootloader may be performed by a single core, and operations in a normal boot mode running an operating system may be performed by a plurality of cores included in one or more processors.

[0120] When a program is loaded from storage (1300) to main memory (1200) in response to a program load request in which one or more instructions of the program are executed, the processor of the system-on-chip (1100) can process the program by executing instructions and performing operations.

[0121] In one embodiment, the electronic paper device (1000) may include various types of devices including an electronic paper display. For example, the electronic paper device (1000) may include a large electronic paper display, digital signage, an e-book reader, a smart display, an electronic notepad, etc., but is not limited thereto.

[0122] The present disclosure provides a method for setting and using a boot mode that performs only screen refresh to refresh the screen of an electronic paper device, and an electronic paper device. The technical problems to be solved by the present disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description in this specification.

[0123] According to one aspect of the present disclosure, a method of operating an electronic paper device may be provided.

[0124] The above method may include the step of executing a bootloader based on the identification of power-on.

[0125] The above method may include a step of identifying a boot mode selected in the bootloader.

[0126] The above method may include the step of loading an image in storage using only the bootloader, based on the fact that the boot mode is a screen refresh mode.

[0127] The above method may include the step of displaying the image on a screen.

[0128] The above method may include the step of turning off the power of the electronic paper device.

[0129] The image displayed on the screen can be maintained when the power of the electronic paper device is turned off.

[0130] The above method may include repeating power on / off for screen refresh at preset time intervals.

[0131] The above method may involve changing the image displayed on the screen whenever the screen of the electronic paper device is refreshed.

[0132] The above method may include the step of selecting the boot mode as a normal boot mode and executing the operating system based on the identification of power-on by user input.

[0133] The above method may include the step of running an application to load one or more images.

[0134] The above method may include the step of displaying one or more images on the screen.

[0135] The step of loading one or more of the above images may be to load one or more of the above images from at least one of an external storage medium or a server.

[0136] The above method may include the step of setting the boot mode to a screen refresh mode while the operating system is running when the boot mode is selected as the normal boot mode.

[0137] The above method may include the step of creating a partition in the storage based on setting the boot mode to a screen refresh mode.

[0138] The above method may include the step of storing one or more images in the partition.

[0139] The above method may include the step of turning off the power of the electronic paper device.

[0140] The above method may include the step of turning on the power of the electronic paper device for screen refresh after a preset time has elapsed following the power of the electronic paper device being turned off.

[0141] The step of loading an image within the storage may involve booting the electronic paper device into the screen refresh mode and loading the image from the partition of the storage.

[0142] The above method may use a single core of the CPU in the screen refresh mode where only the bootloader is executed, and use multiple cores of the CPU in the general boot mode where the operating system is executed.

[0143] According to one aspect of the present disclosure, an electronic paper device may be provided.

[0144] The electronic paper device may include a system-on-chip comprising at least one processor, storage for storing instructions, a main memory on which the instructions are loaded, and a display for displaying content on a screen.

[0145] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can execute a bootloader based on power-on identification.

[0146] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can identify a boot mode selected in the bootloader.

[0147] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can load an image in the storage into the main memory using only the bootloader, based on the fact that the boot mode is a screen refresh mode.

[0148] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can display the image on the screen of the display.

[0149] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can turn off the power of the electronic paper device.

[0150] The image displayed on the screen can be maintained when the power of the electronic paper device is turned off.

[0151] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can repeat power on / off for screen refresh at preset intervals.

[0152] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can change the image displayed on the screen whenever the screen of the electronic paper device is refreshed.

[0153] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can select the boot mode as a normal boot mode and execute an operating system based on the identification of power-on by user input.

[0154] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can execute an application to load one or more images.

[0155] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can display the one or more images on the screen.

[0156] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can load the one or more images from at least one of an external storage medium or a server.

[0157] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can set the boot mode to a screen refresh mode while the operating system is running with the boot mode selected as the normal boot mode.

[0158] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can create a partition in the storage based on setting the boot mode to a screen refresh mode.

[0159] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can store the one or more images in the partition.

[0160] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can turn off the power of the electronic paper device.

[0161] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can turn on the power of the electronic paper device for screen refresh after a preset time has elapsed since the power of the electronic paper device was turned off.

[0162] By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device can boot the electronic paper device into the screen refresh mode and load the image from the partition of the storage.

[0163] By executing the above instructions by the at least one processor within the system-on-chip, the electronic paper device can use a single core of the CPU in the screen refresh mode where only the bootloader is executed, and use multiple cores of the CPU in the general boot mode where the operating system is executed.

[0164] Meanwhile, embodiments of the present disclosure may also be implemented in the form of a recording medium comprising computer-executable instructions, such as program modules executed by a computer. A computer-readable medium may be any available medium accessible by a computer and includes both volatile and non-volatile media, and both removable and non-removable media. Additionally, a computer-readable medium may include a computer storage medium. A computer storage medium includes both volatile and non-volatile, removable and non-removable media implemented by any method or technique for storing information, such as computer-readable instructions, data structures, program modules, or other data.

[0165] Additionally, computer-readable storage media may be provided in the form of non-transitory storage media. Here, 'non-transitory storage media' simply means that it is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily. For example, 'non-transitory storage media' may include a buffer where data is stored temporarily.

[0166] According to one embodiment, the method according to the various embodiments disclosed herein may be provided by being included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable app) may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0167] The foregoing description of the present disclosure is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present disclosure. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0168] The scope of the present disclosure is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present disclosure.

Claims

1. In a method of operating an electronic paper device, A step of executing the bootloader based on power-on identification; A step of identifying a boot mode selected in the above bootloader; Based on the fact that the above boot mode is a screen refresh mode, a step of loading an image in storage using only the bootloader; Step of displaying the above image on the screen; and A method comprising the step of turning off the power of the electronic paper device.

2. In Paragraph 1, The image displayed on the screen is maintained when the power of the electronic paper device is turned off, and The above method comprises repeating power on / off for screen refresh at preset intervals.

3. In Paragraph 2, The above method is a method of changing an image displayed on the screen whenever the screen of the electronic paper device is refreshed.

4. In Paragraph 1, The above method is, A step of selecting the boot mode as a normal boot mode and executing an operating system based on the identification of power-on by user input; A step of running an application to load one or more images; and A method comprising the step of displaying one or more of the above images on the screen.

5. In Paragraph 4, The above method further comprises the step of setting the boot mode to a screen refresh mode while the operating system is running when the boot mode is selected as the normal boot mode.

6. In Paragraph 5, The above method is, A step of creating a partition in the storage based on setting the above boot mode to a screen refresh mode; A step of storing one or more images in the above partition; and A method further comprising the step of turning off the power of the electronic paper device.

7. In Paragraph 6, The above method further comprises the step of turning on the power of the electronic paper device for screen refresh after a preset time has elapsed since the power of the electronic paper device was turned off.

8. In an electronic paper device, A system-on-chip comprising at least one processor; Storage for storing instructions and main memory on which the instructions are loaded; and Includes a display that displays content on the screen, By executing the above instructions by the at least one processor within the system-on-chip, the electronic paper device, Execute the bootloader based on power-on identification, and Identify the boot mode selected in the above bootloader, and Based on the fact that the above boot mode is a screen refresh mode, the image in the storage is loaded into the main memory using only the bootloader, and Display the above image on the screen of the above display, and An electronic paper device that turns off the power of the above electronic paper device.

9. In Paragraph 8, The image displayed on the screen is maintained when the power of the electronic paper device is turned off, and By executing the above instructions by the at least one processor in the system-on-chip, the electronic paper device is an electronic paper device in which power on / off for screen refresh is repeated at preset times.

10. In Paragraph 9, The electronic paper device, wherein the above instructions are executed by the at least one processor in the system-on-chip, changes the image displayed on the screen whenever the screen of the electronic paper device is refreshed.

11. In Paragraph 8, By executing the above instructions by the at least one processor within the system-on-chip, the electronic paper device, Based on the identification of power-on by user input, the boot mode is selected as a normal boot mode and the operating system is executed, and Run the application to load one or more images, and An electronic paper device that displays one or more of the above images on the screen.

12. In Paragraph 11, The electronic paper device, wherein the above instructions are executed by the at least one processor within the system-on-chip, such that the boot mode is selected as the normal boot mode and the boot mode is set to a screen refresh mode while the operating system is running.

13. In Paragraph 12, By executing the above instructions by the at least one processor within the system-on-chip, the electronic paper device, Based on the above boot mode being set to screen refresh mode, a partition is created in the above storage, and One or more of the images are stored in the above partition, and An electronic paper device that turns off the power of the above electronic paper device.

14. In Paragraph 13, An electronic paper device in which the above instructions are executed by at least one processor in the system-on-chip, such that the electronic paper device turns on the power of the electronic paper device for screen refresh after a preset time has elapsed after the power of the electronic paper device is turned off.

15. A computer-readable recording medium having a program for executing the method of any one of paragraphs 1 through 7 on a computer.

Images