WO2024001257A1

WO2024001257A1 - Display device and processing method for display device

Info

Publication number: WO2024001257A1
Application number: PCT/CN2023/078668
Authority: WO
Inventors: 汪静娴; 韩征; 片兆峰; 段雨
Original assignee: 海信视像科技股份有限公司
Priority date: 2022-06-28
Filing date: 2023-02-28
Publication date: 2024-01-04

Abstract

Provided in the present disclosure are a display device and a processing method for a display device. The method comprises: after receiving an instruction, which is input by a user and is used for instructing to display a screen-mirroring function page, a display device acquires a device identifier in response to the instruction; if no valid device identifier is acquired, a screen-mirroring function is not enabled, and the display device is enabled in a black screen state, and at this moment, the display device displays prompt information, which is used for prompting a user that there is a problem with the device identifier; and after acquiring a valid device identifier, the display device enables the screen-mirroring function, and displays the screen-mirroring function page after the screen-mirroring function is enabled. Therefore, when a display device is in a black screen state, prompt information can be displayed to prompt a user of the cause of the black screen, thereby preventing the user from waiting in vain for a page to load.

Description

A display device and a processing method for the display device

Cross-references to related applications

This application is required to be submitted to the China Patent Office on June 28, 2022, with the application number 202210746808.9. It is required to be submitted to the China Patent Office on July 7, 2022, with the application number 202210803145.X, and it is required to be submitted on August 15, 2022. Priority is granted to the Chinese Patent Office and Chinese patent application with application number 202210977484.X, the entire content of which is incorporated into this application by reference.

Technical field

The present disclosure relates to the technical field of intelligent display devices, and in particular, to a display device and a processing method for the display device.

Background technique

A display device refers to a terminal device that can output a specific display screen, which can be a smart TV, a mobile terminal, a smart advertising screen, a projector and other terminal devices. Take smart TVs as an example. Smart TVs are based on Internet application technology, have open operating systems and chips, have an open application platform, can realize two-way human-computer interaction functions, and integrate multiple functions such as audio-visual, entertainment, and data. Products are used to meet the diverse and personalized needs of users.

Wireless screen projection, also known as wireless screen sharing, flying screen, and screen sharing, refers to displaying the screen projection data provided by one terminal device on another terminal device in real time through the screen projection protocol. The screen projection data can be media data and real-time operations. Screen etc. When users use the wireless screen mirroring function on a terminal device, they can learn and set screen mirroring information related to the terminal device by viewing the screen mirroring function page of the terminal device. However, the terminal device will display a black screen before displaying the screen projection function page, causing the user to blindly wait for the screen projection function page to be displayed, reducing the user's user experience.

Contents of the invention

The present disclosure provides a display device, including: a display configured to display a screen projection function page that contains screen projection information of the display device; a controller configured to: respond to a user input Instructions for displaying the screen projection function page are obtained, and the device identification is used to verify the permission of the display device to use the screen projection function; if the device identification is not obtained, or according to the obtained device identification If the identification verifies that the display device does not have the permission to use the screen projection function, the screen projection function will not be started, and the display will be controlled to be in a black screen state, and a prompt message will be displayed; after the display device is verified according to the obtained device identification After having the permission to use the screen projection function, the screen projection function is started, and after the screen projection function is started, the display is controlled to display the screen projection function page.

The present disclosure provides a processing method for a display device. The method includes: in response to an instruction input by a user to display the screen projection function page, obtain a device identification, and the device identification is used to verify the display. The device has permission to use the screen projection function; if the device identification is not obtained, or it is verified based on the obtained device identification that the display device does not have the permission to use the screen projection function, the screen projection function will not be started and all controls will be controlled. The display is in a black screen state and displays a prompt message; after verifying that the display device has the permission to use the screen projection function based on the obtained device identification, the screen projection function is started, and the display is controlled after the screen projection function is started. The screen projection function page is displayed.

Description of drawings

Figure 1 is a usage scenario of a display device according to some embodiments;

Figure 2 is a configuration diagram of a display device according to some embodiments;

Figure 3 is a configuration block diagram of a control device according to some embodiments;

Figure 4 is an operating system configuration diagram of a display device according to some embodiments;

Figure 5 is a schematic diagram of a signal source menu according to some embodiments;

Figure 6 is a schematic diagram of a screen casting function page according to some embodiments;

Figure 7 is a schematic flowchart showing a black screen state during the process of displaying the screen projection function page according to some embodiments;

Figure 8 is a flowchart of a processing method for a display device according to some embodiments;

Figure 9 is a schematic flowchart of displaying prompt information when the screen is in a black screen state during the process of displaying the screen projection function page according to some embodiments;

Figure 10 is a schematic flowchart of displaying prompt information when the screen is in a black screen state during the process of displaying the screen projection function page according to some embodiments;

Figure 11 is a schematic flowchart of updating device identification according to some embodiments;

Figure 12 is a schematic diagram of a first query page according to some embodiments;

Figure 13 is a schematic diagram of a waiting page according to some embodiments;

Figure 14 is a schematic diagram of a re-download page according to some embodiments;

Figure 15 is a schematic diagram of an update failure page according to some embodiments;

Figure 16 is a schematic diagram of the underlying architecture for implementing the wireless screen projection function according to some embodiments;

Figure 17 is a schematic flowchart of activating the screen casting function and displaying the screen casting function page according to some embodiments;

Figure 18 is a communication diagram activating the screen casting function and displaying the screen casting function page according to some embodiments;

Figure 19 is a communication diagram for activating the screen casting function and displaying the screen casting function page according to some embodiments;

Figure 20 is a communication diagram activating the screen casting function and displaying the screen casting function page according to some embodiments;

Figure 21 is a communication diagram for activating the screen casting function and displaying the screen casting function page according to some embodiments;

Figure 22 is a communication diagram for activating the screen casting function and displaying the screen casting function page according to some embodiments;

Figure 23 is a schematic diagram of a display device displaying a signal source page according to some embodiments;

Figure 24 is a schematic diagram of a display device displaying a screen projection information page according to some embodiments;

Figure 25 is a schematic flowchart of a display device control method according to some embodiments;

Figure 26 is a schematic flowchart of a display device control method according to some embodiments;

Figure 27 is a schematic flowchart of a display device control method according to some embodiments;

Figure 28 is a schematic diagram of an interface jump of a display device according to some embodiments;

Figure 29 is a schematic diagram of an interface jump of a display device according to some embodiments;

Figure 30 is a schematic diagram of an interface jump of a display device according to some embodiments;

Figure 31 is an interactive flow chart of a business voucher writing method according to some embodiments;

Figure 32 is an interactive flow chart of a business voucher writing method according to some embodiments;

Figure 33 is an interactive flow chart of a business voucher writing method according to some embodiments;

Figure 34 is an interactive flow chart of a business voucher writing method according to some embodiments;

Figure 35 is an interactive flow chart of a business voucher writing method according to some embodiments;

Figure 36 is a step flow chart of a business voucher writing method according to some embodiments;

Figure 37 is a step flow chart of a business voucher writing method according to some embodiments.

Detailed ways

An embodiment will be described in detail below, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following examples do not represent all implementations consistent with the present disclosure. are merely examples of systems and methods consistent with some aspects of the disclosure as detailed in the claims.

It should be noted that the brief description of terms in this disclosure is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of the disclosure. Unless otherwise stated, these terms should be understood according to their ordinary and usual meaning.

The terms "first", "second", "third", etc. in the description and claims of this disclosure and the above-mentioned drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit specific Sequential or sequential order unless otherwise noted. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

The display device provided by the embodiment of the present disclosure can have a variety of implementation forms, for example, it can be a smart TV, a laser projection device, a monitor, an electronic bulletin board, an electronic table, etc., or it can be Mobile phones, tablets, smart watches and other devices with displays. Figures 1 and 2 illustrate a specific implementation of the display device of the present disclosure.

FIG. 1 is a schematic diagram of an operation scenario between a display device and a control device according to an embodiment. As shown in FIG. 1 , the user can operate the display device 200 through the mobile terminal 300 or the control device 100 .

FIG. 3 is a configuration block diagram of the control device 100. In some embodiments, the control device 100 may be a remote controller, and the communication between the remote controller and the display device includes at least one of infrared protocol communication or Bluetooth protocol communication, and other short-distance communication methods, and the display is controlled through wireless or wired methods. Equipment 200. The user can control the display device 200 by inputting user instructions through buttons on the remote control, voice input, control panel input, etc.

In some embodiments, a mobile terminal 300 (such as a mobile phone, tablet, computer, laptop, etc.) may also be used to control the display device 200 . For example, the display device 200 is controlled using an application program running on the mobile terminal 300 .

FIG. 3 shows a configuration block diagram of the display device 200 according to an exemplary embodiment.

The display device 200 includes at least one of a tuner and demodulator 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, and a user interface 280.

In some embodiments, the display device 200 can establish the transmission and reception of control signals and data signals with the control device 100 or the screen projection device through the communicator 220 . In some embodiments, the controller 250 and the tuner-demodulator 210 may be located in different separate devices, that is, the tuner-demodulator 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box. wait. In some embodiments, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in the memory. The controller 250 controls the overall operation of the display device 200. In some embodiments, the controller 250 includes a central processing unit (CPU), a video processor, an audio processor, a graphics processor (Graphics Processing Unit, GPU), RAM (Random Access Memory), ROM (Read -Only Memory), at least one of the first to nth interfaces for input/output, communication bus (Bus), etc. In some embodiments, the display 260 includes a display screen component for presenting images, and a driving component for driving image display, for receiving image signals output from the controller 250 and displaying video content, image content, and menu control interfaces. components and user control UI interface. In some embodiments, the display 260 can be a liquid crystal display, an OLED display, a projection display, or a projection device and a projection screen. In some embodiments, the user may input user commands in a graphical user interface (GUI) displayed on the display 260, and the user input interface receives user input commands through the graphical user interface (GUI). Alternatively, the user can input a user command by inputting a specific sound or gesture, and the user input interface recognizes the sound or gesture through the sensor to receive the user input command.

Referring to Figure 4, in some embodiments, the operating system of the display device 200 is divided into four layers. From top to bottom, they are the Applications layer (referred to as the "Application layer") and the Application Framework layer. (referred to as "framework layer"), Android runtime (Android runtime) and system library layer (referred to as "system runtime library layer"), and kernel layer. In some embodiments, at least one application program runs in the application layer. These applications can be the window program, system setting program or clock program that comes with the operating system; they can also be developed by third-party developers. s application. The application framework layer provides an application programming interface (API) and programming framework for applications in the application layer. The application framework layer includes some predefined functions. The application framework layer is equivalent to a processing center, which decides the actions for the applications in the application layer. Through the API interface, the application can access the resources in the system runtime layer and obtain system services during execution, and call the corresponding driver in the kernel layer to drive the corresponding module to use the corresponding resources to perform the corresponding services.

The display device 200 can establish a connection with a terminal device through a screen projection protocol, and display the screen projection data provided by the terminal device. The terminal device can be a mobile phone, a tablet computer, a computer, a laptop, etc. Taking the scene shown in Figure 1 as an example, the display device 200 and the mobile terminal 300 establish a connection through the screen projection protocol, and the mobile terminal 300 transmits the screen data to the display device 200, so that the display device 200 displays the screen displayed by the mobile terminal 300 in real time. . The screen casting function page of the display device 200 contains the screen casting information of the display device 200. The user can cast the screen by browsing On the function page, you can learn the screen projection information of the display device 200 and set the screen projection function of the display device 200 .

The entrance to the screen projection function page can be set in the function menu of the display device 200, such as the Setting (Setting) menu, the signal source (Input) menu, etc. The user can control the display device 200 to display the function menu by inputting an instruction to display the function menu where the entrance to the screen projection function page is by manipulating the control device 100 , and then the user selects the entrance to the screen projection function page by manipulating the control device 100 to control the display device. 200 displays the screen projection function page. Taking the control device 100 as a remote controller and the entrance to the screen projection function page being set in the signal source menu as an example, the process of displaying the screen projection function page will be described. The user sends an instruction to display the signal source menu to the display device 200 by controlling the remote control. For example, the remote control is provided with a signal source button. The user sends an instruction to the display device 200 by pressing the signal source button, and the display device 200 receives the instruction. Afterwards, by identifying the key value "signal source" to determine that the instruction is an instruction to display the signal source menu, the display device 200 displays the signal source menu in response to the instruction. Take the signal source menu shown in Figure 5 as an example. The signal source menu includes multiple signal source options, such as TV (TV), wireless playback (AirPlay), high-definition multimedia (High Definition Multimedia Interface, HDMI), etc. Among them, wireless playback is the entrance to the screen projection function page. The user moves the focus to the wireless playback option by controlling the remote control, and presses the "Confirm" button on the remote control to send an instruction to display the screen projection function page to the display device 200. In response to the instruction, the display device 200 displays Screencast function page. The screen casting function page includes screen casting information of the display device 200 and options for setting the screen casting function of the display device 200. Take the screen casting function page shown in Figure 6 as an example for explanation. The screen casting function page includes the current access of the display device 200. Wi-Fi network, display the terminal device to which the device 200 is connected, set the function options of wireless screen casting and smart home platform (AirPlay and HomeKit Settings), and screen casting options, such as wireless screen casting option 601 and airdrop 602. The screencasting function page also includes some related instructions to instruct the user to perform related operations. The display device 200 is currently connected to Wi-Fi1 and chooses to connect to device A in the living room. The user can reselect the Wi-Fi network to be accessed and the terminal device to be connected by setting the functions of wireless screen projection and smart home platform, and select the screen projection method between the display device 200 and the terminal device by selecting the screen projection option. .

The basis that the display device 200 can display the screen casting function page is that the display device 200 has the permission to use the screen casting function. That is to say, the display device 200 can only display the screen casting function page if it has the permission to use the screen casting function. If the display device 200 has the permission to use the screen casting function, If 200 does not have the permission to use the screen mirroring function, it cannot display the screen mirroring function page. At this time, the display device 200 will be in a black screen state. Taking the signal source menu shown in Figure 5 (the same as ① in Figure 7) as an example, the user controls the remote control to input instructions based on the wireless screen projection option. If the display device 200 does not have the permission to use the screen projection function, the screen will be in a black state. , as shown in ② in Figure 7. In the embodiment of the present disclosure, the black screen state means that no page is displayed. When the display device 200 does not have the permission to use the screen projection function and displays a black screen state, the user cannot know the reason for the black screen state and cannot determine a method to solve the black screen. The user can only choose to wait blindly for the display device 200 to display the screen projection function page. In fact, the display device 200 will not display the screen projection function page subsequently, causing the user to wait ineffectively. Even if the user chooses to exit the screen mirroring function page and re-enters the screen mirroring function page by re-selecting the wireless screen mirroring option, the display device 200 will still be in a black screen state because the display device 200 still does not have the permission to use the screen mirroring function.

In order to solve the problem that when the above display device 200 displays the screen projection function page, due to the lack of screen projection function, To solve the problem of black screen due to permission usage, the display device 200 can display the screen projection function page according to the process shown in Figure 8. The specific steps are as follows:

S801: The display device 200 acquires the device identifier in response to an instruction input by the user indicating that the screen projection function page is displayed.

In the embodiment of the present disclosure, the device identifier uniquely corresponds to the display device 200 and can be called the key of the display device 200. The device identifier is used to verify whether the display device 200 has the permission to use the screen projection function. The device identification may be the device identity (Identity, ID) of the display device 200, etc. Usually, the manufacturer of the display device 200 will burn and pre-program the method of obtaining the device identification (such as a storage address, etc.) into the display device 200. The display device 200 will At runtime, if the device identity needs to be used, the device identity is obtained through the Internet according to the prefabricated acquisition method.

The screen casting function belongs to the enhanced experience (Enhanced Experience) function of the display device 200. Before using the screen casting function, the display device 200 needs to verify whether the display device 200 has the permission to use the screen casting function. The permission can include the system of the display device 200. Whether the version supports the screen casting function, whether the device identity of the display device 200 is trustworthy to support the screen casting function, etc. Only when the display device 200 passes the verification, the screen projection function can be used to ensure the effectiveness, safety, etc. of using the screen projection function.

After receiving an instruction input by the user instructing to display the screen projection function page, the display device 200 responds to the instruction and obtains the device identification to verify whether it has permission to use the screen projection function.

S802. If the display device 200 does not obtain the device identification, or verifies that it does not have the permission to use the screen projection function based on the obtained device identification, the display device 200 does not start the screen projection function, displays a black screen state, and displays a prompt message.

When the display device 200 does not obtain the device identification, it can directly determine that it does not have the right to use the screen projection function.

After the display device 200 obtains the device identification, it needs to further verify whether the display device 200 has the permission to use the screen projection function based on the obtained device identification.

For example: the display device 200 calculates the verification value corresponding to the device identification according to a preset verification algorithm. If the verification value is consistent with the verification value preset for the use authority of the screen projection function, the verification is passed, that is, the display device 200 has the use authority of the screen projection function. If the verification value is different from the verification value preset for the use permission of the screen projection function, the verification fails, that is, the display device 200 does not have the use permission of the screen projection function.

Another example: the display device 200 determines the usage rights corresponding to the device identification according to the preset mapping relationship. If the usage permission corresponding to the device identification is allowed, the verification is passed, that is, it is shown that the device 200 has the usage permission for the screen projection function. If the usage permission corresponding to the device identification is prohibited, the verification fails, that is, the display device 200 does not have the usage permission for the screen projection function.

If the display device 200 does not have the permission to use the screen projection function, the screen projection function will not be started and the screen will be in a black state. Based on the above process, the display device 200 can determine that the reason for not having the permission to use the screen projection function is that there is a problem with the device identification (not obtained, or failed to pass verification), and the display device 200 displays a prompt message to prompt the user to have a black screen. The reason for the status is a problem with the device identification.

The prompt information may include information that prompts a problem with the device identity, such as text and icons, and may also include shortcut options for viewing information related to the device identity.

Taking the signal source menu shown in Figure 5 (same as ① in Figure 9) as an example, the user controls the remote control to project the screen wirelessly. After the option input command, if the display device 200 does not have the permission to use the screen projection function, the screen will be black and a prompt message will be displayed, as shown in ② in Figure 9 . The prompt information includes "Please check the device identification" and icon 901. By reading this prompt information, users can quickly understand that the reason for the black screen state is a problem with the device identification. The black screen problem can be solved by checking the device identification, thereby preventing the user from blindly waiting for the page to load.

Take the information related to the device identification on the homepage (Home) of the display device 200, and take the signal source menu shown in Figure 5 (the same as ① in Figure 10) as an example. The difference from ② in Figure 9 is that if the display device 200 does not have Regarding the permission to use the screen projection function, the displayed prompt information also includes shortcut option 1001. Shortcut option 1001 is the entrance to the signal source menu, as shown in ② in Figure 10. From this, the user can not only quickly understand that the cause of the black screen state is a problem with the device identification, but can also solve the black screen problem by checking the device identification, and can directly return to the signal source menu by selecting shortcut option 1001 to enter from the signal source menu. View relevant information about device identification on the home page, thereby improving user convenience.

The display device 200 displays prompt information, which can be implemented through a native application in the operating system, such as a notification (Notification) application. The display device 200 verifies the permission to use the screen mirroring function by monitoring the startup notification of the screen mirroring function, and when the verification fails, directly calls the notification application to display the notification, and the content of the notification is the prompt information. Therefore, there is no need to additionally configure a third-party application dedicated to displaying prompt information in the display device 200 .

After browsing the prompt information, the user can check the device identification based on the prompt information and obtain a new device identification so that the display device 200 has the permission to use the screen projection function, thereby solving the black screen problem.

In order to facilitate user operations and prevent users from being unable to solve the black screen situation when they do not know how to obtain a new device identification, the display device 200 is configured to proactively provide the user with a solution path when there is a problem with the device identification. The display device 200 also displays a first portal, which is used to enter a related page provided by the display device 200 to resolve invalid device identification.

In some embodiments, the first entrance may be an independent entrance. In some embodiments, the first entrance may be the information window where the prompt information is located, such as the information window 902 of ② in Figure 9, and the information window 1002 of ② in Figure 10.

The display device 200 can solve the problem of device identification according to the process shown in Figure 11. The specific steps are as follows:

S1101. The display device 200 displays the first query page in response to the entry instruction input by the user based on the first portal.

Taking the control device 100 as a remote controller, take the page ② in Figure 9 as an example. The user moves the focus to the information window 902 by manipulating the remote control, and inputs an entry command to the display device 200 by pressing the "confirm" button on the remote control. The display device 200 displays the first inquiry page in response to the entry instruction. The first inquiry page is used to ask the user whether to obtain the device identification again, that is, whether the display device 200 needs to solve the problem of the device identification. Reference may be made to the first inquiry page shown in Figure 12. The first inquiry page includes prompt text to prompt the user for an upcoming operation, such as "update device identification", that is, to prompt the user that the device identification is about to be updated. The first query page also includes operation options, such as update option 1201 and cancel option 1202 . Among them, the update option 1201 is used for the user to input an instruction instructing the display device 200 to perform the operation shown in the prompt text, such as updating the device identification. The cancel option 1202 is used for user input to instruct the display device 200 to terminate the task related to resolving the device identification problem.

S1102. The display device 200 responds to the instruction input by the user to re-obtain the device identification, obtains the device identification, and displays the waiting page.

Taking the first inquiry page shown in FIG. 12 as an example, the user moves the focus to the update option 1201 by controlling the remote control, and presses the "confirm" button of the remote control to input an instruction to the display device 200 to re-obtain the device identity. instruction. In response to the instruction, the display device 200 reacquires the device identification. For example: the display device 200 calls a reset (Reset) interface to re-obtain the device identity. The process of the display device 200 re-acquiring the device identification is similar to step S801 and will not be described again here.

When the display device 200 reacquires the device identification, it displays a waiting page. The waiting page includes waiting prompt information to prompt the user that the display device 200 is reacquiring the device identity. The waiting prompt information may include text information, icons, etc. Taking the waiting page shown in Figure 13 as an example, the waiting page includes text information "Updating device identification, please wait" and a countdown icon 1301. The countdown icon 1301 can visually display the remaining time required for the display device 200 to obtain the device identification, and/or the progress of the display device 200 in obtaining the device identification. The countdown icon 1301 includes a duration value, a progress icon, or both a duration value and a progress icon. Among them, the duration value is used to represent the remaining time for the display device 200 to obtain the device identification. The duration value adopts a countdown display method. The initial duration value of the duration value is the total time for the display device 200 to obtain the device identification. When the duration value is 0 , indicating that the display device 200 has completed the task of obtaining the device identity this time. The progress icon is used to represent the progress of the display device 200 in obtaining the device identification. The progress of the display device 200 in obtaining the device identification matches the total time for obtaining the device identification. That is, the longer the total time for obtaining the device identification, the longer the progress of obtaining the device identification. The slower it is; conversely, the shorter the total time to obtain the device identification is, the faster the progress of obtaining the device identification is. The progress icon includes two parts. One part corresponds to the complete progress icon, indicating the total progress of the display device 200 in obtaining the device identification. The total time to complete the total progress is equal to the total time in which the display device 200 obtains the device identification. The other part represents The display device 200 has completed the progress of obtaining the device identification, and the difference between the two parts is the progress of the display device 200 obtaining the device identification that has not yet been completed.

The total time for the display device 200 to obtain the device identification may be a preset fixed value, or it may be a dynamic value calculated in real time by the display device 200 based on the current network environment and the like. After the display device 200 determines the total time for obtaining the device identification, it can start timing through the timer (Time) function. The time value displayed in the countdown icon 1301 is the difference between the total time and the time measured by the timer. The progress icon in the countdown icon 1301 can display the completed progress according to N (N>0) time units of the timer. For example, the progress icon displays the completed progress according to 1 time unit of the timer. At this time, the timer Every time the device adds 1 duration unit, the progress icon increases to show the completed progress corresponding to 1 duration unit. For another example, the progress icon displays the completed progress according to the 3 time units of the timer. At this time, every time the timer increases by 3 time units, the progress icon increases and displays the completed progress corresponding to the 3 time units.

Assume that the total time to obtain the device identification is 12 seconds, the timing unit of the timer is 1 second, and the current time duration is 3 seconds, and the progress icon is a ring as an example. The display device 200 displays a countdown icon 1301, in which the duration value is 9s, that is, the remaining time for the display device 200 to obtain the device identification is 9s. The white part in the progress icon represents the completed progress, and the area of the white part is four quarters of the ring. one, indicating that the display device 200 has completed obtaining the device One quarter of the total progress identified.

After reacquiring the device identification, the display device 200 needs to verify again whether it has the permission to use the screen casting function. The process of re-verifying whether the display device 200 has the permission to use the screen casting function is similar to step S802 and will not be described again here.

In some embodiments, the display device 200 may be configured to only provide the user with a service of re-obtaining the device identity once. That is, if the display device 200 still does not pass the verification after re-acquiring the device identity, it still does not have the screen casting function. If the user has the right to use the device, the user will no longer be provided with the service of re-obtaining the device identity. Therefore, reducing the number of times of re-obtaining the device identification can effectively avoid the time-consuming process of repeatedly obtaining the device identification, thereby reducing the impact on the user experience.

In some embodiments, the display device 200 may be configured to provide the user with a service of re-obtaining the device identity multiple times. That is, after the display device 200 re-obtains the device identity, if the verification still fails, the display device 200 will continue to provide the user with the service of re-acquiring the device identity. Obtain the service of device identification, and after receiving the instruction input by the user to obtain the device identification again, obtain the device identification again until the upper limit of the number of times of re-obtaining the device identification is reached, and the display device 200 no longer provides the user with the method of re-obtaining the device identification. Serve. Therefore, the success rate of obtaining a valid device identity can be improved by re-obtaining the device identity multiple times, thereby improving the user experience. For example, if the display device 200 still fails to pass the verification, a re-download page is displayed. Refer to the re-download page shown in FIG. Identity", which prompts the user that the device identification is about to be updated. The re-download page also includes operation options, such as a Retry option 1401 and a Cancel option 1402 . Among them, the try again option 1401 is used for user input to instruct the display device 200 to obtain the device identification again. The cancel option 1402 is used for user input to instruct the display device 200 to terminate the task related to resolving the device identification problem. Taking the control device 100 as a remote controller as an example for illustration, the user controls the remote controller to move the focus to the try again option 1401, and presses the "confirm" button of the remote controller to input an instruction to the display device 200 to obtain the device identification again. . The process in which the display device 200 obtains the device identification again in response to the instruction is similar to step S1102 and will not be described again here. Assume that the upper limit of the number of times the display device 200 can re-obtain the device identity is 5 times. When the number of times the display device 200 obtains the device identity is equal to 5 times, and after obtaining the device identity for the fifth time, the verification is still not passed, and the display device 200 is no longer Users are provided with the service of re-obtaining device identification.

If the display device 200 still fails to obtain the device identification after reacquiring the device identification at least once, or if it is verified that it does not have the permission to use the screen projection function based on the obtained device identification, the update failure page will be displayed.

The update failure page includes an update failure prompt to remind the user that the device identification update failed, and the service of obtaining the device identification is no longer provided this time.

In some embodiments, in order to facilitate the user to still solve the black screen problem caused by a problem with the device identification when the display device 200 no longer provides the service of obtaining the device identification, the update failure prompt includes a specified number and an operation prompt. Among them, the designated number uniquely corresponds to the device identification, and the operation prompt is used to prompt the user to feed back the designated number to the third-party terminal or server to update the device identification through the third-party terminal or server. The designated number can all be the same type of characters, such as all numbers, or all letters, etc. The designated number can also be a combination of multiple characters, such as a combination of numbers and letters, a combination of numbers and symbols, etc. A third-party terminal or server can configure the display The manufacturer, operation and maintenance, etc. of the device 200 have the authority to obtain the corresponding relationship between the specified number and the device identification, and have the authority to view the device identification update record, so that the device identification update failure record can be analyzed based on the device representation update record of the device 200. reason.

In some embodiments, the user can contact the third-party terminal or server by himself and inform the third-party terminal or server of the specified number in the update failure prompt. In some embodiments, in order to avoid additional operations by the user, the display device 200 is configured to also display a confirmation (OK) option on the update failure page. The confirmation option is an entry point for the user to enter an instruction instructing the display device 200 to contact a third-party terminal or server to update the device identification. In response to the instruction, the display device 200 sends the specified number to the third-party terminal or server in a preset communication method. Among them, the pre-stored communication methods can be set by the manufacturer or the user. The pre-stored communication methods can include email, cloud account, text message, etc.

You can refer to the update failure page shown in Figure 15. The update failure page includes the update failure prompt "Update failed. Please inform the after-sales service or manufacturer of the designated number No. 1××××0.", and confirmation option 1501. The description takes the control device 100 as a remote controller and the pre-stored communication method as email as an example. The user moves the focus to the confirmation option 1501 by controlling the remote control, and inputs instructions to the display device 200 by pressing the "confirm" button of the remote control. In response to the instruction, the display device 200 sends the specified number by email to the mailbox of the pre-stored third-party terminal or server.

The display device 200 responds to the instruction input by the user based on the confirmation option, closes the update failure page, and displays a menu including the entrance to the screen projection function page, such as displaying the signal source menu shown in FIG. 5 , or displaying other user interfaces, such as the display device 200 main page, etc.

S803: After verifying the usage rights of the screen casting function according to the obtained device identification, the display device 200 starts the screen casting function, and displays the screen casting function page after the screen casting function is started.

If the display device 200 passes the verification based on the obtained device identification when responding to the instruction input by the user to display the screen projection function page, that is, the display device 200 has the permission to use the screen projection function, or the display device 200 performs the function on one or more occasions. After re-obtaining the device identification for the first time, if the device identification passed the verification last time, that is, the display device 200 has the permission to use the screen casting function, the screen casting function is started, and after the screen casting function is started, the screen casting function page is displayed.

Combined with the operating system shown in Figure 4, the realization of the screencasting function depends on the entrance of the screencasting function page located at the application layer, the screencasting service and screencasting application package located at the system framework layer, and the projection function located at the system runtime layer. Cooperation between screen processes. Take the screen projection function as the wireless screen projection shown in Figure 5 as an example. As shown in Figure 16, the entrance to the screen projection function page is the wireless screen projection in the signal source menu in Figure 5. The user can use this entrance to interact with the display. The device 200 interacts to use the screen casting function. The screen mirroring application package is a wireless screen mirroring application (AirPlay Apk), which is used to connect the properties of the whole machine and obtain the machine parameters related to the wireless screen mirroring function, such as volume, etc. The screen mirroring process is the wireless screen mirroring process (AirPlay Daemon), which is a resident local (Native) daemon that can communicate with the kernel layer to drive hardware devices, such as driving the monitor to display the screen mirroring function page. The screen casting service is the wireless screen casting service (AirPlay Lunch Service). The wireless screen casting service can provide an interface for the screen casting application, query the relevant permission information of the wireless screen casting application, manage the life cycle of the wireless screen casting application, and communicate with the wireless Screencasting process To communicate etc.

The user inputs an instruction to the display device 200 based on the entrance of the screen projection function page. This process is similar to the above process of the user inputting instructions based on the entrance of the screen projection function page, and will not be described again here. After receiving the instruction, the portal transmits the instruction to the screen mirroring service in the form of a message. The screen mirroring service queries the permission information related to the screen mirroring application, that is, it queries whether it has permission to use the screen mirroring function. The screen mirroring service queries the permissions. The information process is similar to steps S801-S802 and will not be described again here. When the screen mirroring service queries that it has the permission to use the screen mirroring function, it controls the startup of the screen mirroring application, which starts the life cycle of the screen mirroring application. After the screen mirroring application is started, a startup completion notification is sent to the screen mirroring service, so that the screen mirroring service controls the loading of the package file of the screen mirroring application, obtains the page data of the screen mirroring function page, and communicates with the screen mirroring process. , to send a startup message and the page data of the projection function page to the projection process, so that the projection process drives the display to display the projection function page based on the page data of the projection function page.

In the above process, it starts from the time when the screen casting service inquires about the permission to use the screen casting function, and ends when the monitor displays the screen casting function page. The monitor is in a black screen state at this stage. It can be seen that if the communication duration in this stage is longer, the black screen duration in the black screen state will also be longer. If the communication duration in this stage is shorter, the black screen duration in the black screen state will also be shorter. A black screen for a long time will reduce the user experience. In order to solve the problem of the black screen being too long at this stage, the communication time at this stage needs to be shortened.

The screen mirroring service can only perform subsequent steps after receiving the startup completion message sent by the screen mirroring application, that is, it can display the screen mirroring function page on the monitor. In the display device 200, the screen casting application is configured to send a startup completion notification to the screen casting service in the form of background broadcast by default. Among them, except for applications with specified requirements, all other applications in the operating system use background broadcast to send notifications to the corresponding services. Each background broadcast is concentrated in a stack (Stack), and the system framework layer of the operating system will follow this The order in which background broadcasts are received in the stack is passed to the corresponding service in turn. For example: the startup completion notification sent by the screen mirroring application is the 7th background broadcast in the stack, then the system framework layer needs to process the screen mirroring application after processing the 1-6 background broadcasts in the stack. The notification of completion of startup is sent to the screen mirroring service.

After the display device 200 is turned on, the display device 200 first starts the operating system. During the startup process of the operating system, each designated application program that is automatically started after starting up begins to load. These designated application programs are all loaded, that is, the operating system starts. complete. After these specified applications are started, they all send startup completion notifications to the system framework layer through background broadcast. If applications other than these specified applications complete startup in response to the user's startup instructions, the background broadcasts sent by them will be ranked after the background broadcasts sent by these specified applications. That is, the system framework layer will only send these specified applications. After the background broadcast is processed, the background broadcast sent by other applications will be processed. If the display device 200 receives an instruction to display the screen mirroring function page during the startup process of the operating system, and after the screen mirroring application is started, the background broadcast sent to the screen mirroring service will be at least ranked in the background sent by these designated applications. After the broadcast, the communication duration for the screen projection service to receive the background broadcast sent by the screen projection application will be longer, so the black screen duration of the display device 200 in a black screen state will also be longer.

In order to solve the problem that the display device 200 has a long black screen before the screen projection function page is displayed during the startup process of the operating system, the display device 200 can start the screen projection function according to the process shown in Figure 17 and display the screen projection function page. Specific steps are as follows:

S1701. The display device 200 obtains the startup status of the operating system through the screen casting service according to the instructions passed at the entrance of the screen casting function page, and sends a startup notification to the screen casting application to start the screen casting application. Among them, the startup notification is generated based on the startup status of the operating system.

The screen mirroring service can detect whether the operating system has been started by detecting the loading status of each specified application that automatically starts after booting, and whether there is a background broadcast sent by the specified application that automatically starts after booting in the stack. If there are loading and/or unloaded applications that are specified to be automatically started after booting, and there are background broadcasts sent by the specified applications that are automatically started after booting in the stack, etc., the startup status of the operating system is starting. Otherwise, The startup status of the operating system is startup completed. The screen mirroring service sends the obtained startup status of the operating system to the screen mirroring application in the form of a startup notification to start the screen mirroring application.

S1702: The display device 200 sends a startup completion notification to the screen casting process in the target communication mode corresponding to the startup state of the operating system according to the startup notification through the screen casting application, so that the screen casting process drives the display to display the screen casting function page.

The screen mirroring application starts loading according to the received startup notification, and generates a startup completion notification after the loading is completed. In order to shorten the communication time for the screen mirroring application to send the startup completion notification to the screen mirroring process, the screen mirroring application needs to use the target communication method corresponding to the startup status of the operating system to send the startup completion notification to the screen mirroring process, so that the screen mirroring process can The process drives the display to display the screen projection function page.

In one implementation, the startup state of the operating system is starting, and the target communication method is that the screen casting application transmits a startup completion notification to the screen casting process through the screen casting service, where the screen casting application broadcasts to the screen from the foreground. The screen mirroring service sends a notification that it has been started.

As can be seen from the above, if the operating system is starting, the background broadcast sent by the screen mirroring application needs to be processed after the background broadcast sent by the specified application is processed before it can be delivered to the screen mirroring service. Therefore, it will take a long time to wait. . When the operating system starts, the screen mirroring application can send a startup completion notification to the screen mirroring service by broadcasting in the foreground. For example, a screencasting application adds a flag, such as Receiver Foreground, to the broadcast it sends to indicate that the broadcast is a foreground broadcast. Because foreground broadcasts and background broadcasts belong to different stacks, the number of foreground broadcasts is usually small. At the same time, the response time of the foreground broadcast is shorter than the response time of the background broadcast. Usually, the response time of the foreground broadcast is 10s, and the response time of the background broadcast is 60s. That is, the broadcast needs to be processed within the corresponding response time of each broadcast. , thus, the time for processing the foreground broadcast is relatively short. As a result, the startup completion notification sent by the screen casting application can be processed faster, and after waiting for less foreground broadcast processing, it can be delivered to the screen casting service, so that the screen casting service can be used faster is passed to the screen casting process to shorten the communication time between the screen casting application and the screen casting process, thereby shortening the black screen time and effectively improving the user experience. The screen mirroring service can communicate with the screen mirroring process through socket communication via Transmission Control Protocol (TCP).

Take the wireless screen projection function as an example, as shown in Figure 18, including the following steps:

Step 1801: The wireless projection function page receives instructions;

Step 1802: The wireless screen projection function page sends the instruction to the wireless screen projection service;

During implementation, the customer issues instructions in advance through the wireless screen projection function page, and the wireless screen projection function page sends the instructions to the wireless screen projection service by executing the above steps 1801 and 1802;

Step 1803: The wireless screen projection service obtains that the startup status of the operating system is starting, and generates a startup notification; the startup notification writes the business credentials into the preset storage location of the display device;

Step 1804: The wireless screen mirroring service sends the startup notification to the wireless screen mirroring application;

Step 1805: The wireless screen projection application is started and a notification of startup completion is generated;

Step 1806: The wireless screen projection application sends a startup completion notification to the wireless screen projection service in the form of foreground broadcast;

Step 1807: The wireless screen projection service delivers the startup completion notification to the wireless screen projection process;

Step 1808: The wireless projection process drives the display;

Step 1809: The monitor displays the wireless projection function page.

In the above steps, the entrance of the wireless screen projection function page passes the instruction to the wireless screen projection service. The wireless screen projection service obtains that the startup status of the operating system is starting. The wireless screen projection service generates a startup based on the startup status of the operating system. Notification, the startup notification includes instruction information that instructs the screen mirroring application to use the foreground broadcast, such as Foreground, and sends the startup notification to the wireless screen mirroring application. After the wireless screen mirroring application is started, it sends a startup completion notification to the wireless screen mirroring service in the form of a foreground broadcast. The wireless screen projection service transmits the activation completion notification to the wireless screen projection process, so that the wireless screen projection process drives the display to display the wireless screen projection function page.

In one implementation, the startup status of the operating system is starting, and the target communication method is that the screen casting application directly sends a startup completion notification to the screen casting process.

In order to prevent the screen mirroring application from sending the startup completion notification to the screen mirroring service in the form of background broadcast, the screen mirroring application directly establishes communication with the screen mirroring process. Therefore, the screen mirroring application can directly send the startup completion notification to The screen mirroring process does not need to go through the screen mirroring application, which can effectively shorten the communication time between the screen mirroring application and the screen mirroring process, thereby shortening the black screen time and improving the user experience. For example, you can configure a listening interface in the screen mirroring application. After listening to the screen mirroring application being started, you can directly communicate with the screen mirroring process through Socket through TCP.

Take the wireless screen projection function as an example, as shown in Figure 19, including the following steps:

Step 1901: The wireless projection function page receives instructions;

Step 1902: The wireless screen projection function page sends the instruction to the wireless screen projection service;

During implementation, the customer issues instructions in advance through the wireless screen projection function page, and the wireless screen projection function page sends the instructions to the wireless screen projection service by executing the above steps 1901 and 1902;

Step 1903: The wireless screen projection service obtains the startup status of the operating system as starting, and generates a startup completion notification;

Step 1904: The wireless screen projection service sends the startup notification to the wireless screen projection application;

Step 1905: The wireless screen projection application is started and a notification of startup completion is generated;

Step 1906: The wireless screen projection application establishes communication with the wireless screen projection process and sends a startup completion notification to it;

Step 1907: The wireless projection process drives the display;

Step 1908: The monitor displays the wireless screen projection function page.

In the above steps, the entrance of the wireless screen projection function page passes the instruction to the wireless screen projection service. The wireless screen projection service obtains that the startup status of the operating system is starting, and sends a startup notification containing the startup notification to the wireless screen projection application. . After the wireless screen mirroring application is started, it establishes communication with the wireless screen mirroring process, and directly transmits the startup completion notification to the wireless screen mirroring process, so that the wireless screen mirroring process drives the display to display the wireless screen mirroring function page.

In one implementation, the startup state of the operating system is startup completed, and the target communication method is that the screen casting application transmits a startup completion notification to the screen casting process through the screen casting service, wherein the screen casting application uses a background broadcast to The screen mirroring service sends a notification that it has been started.

If the operating system is started, all the background broadcasts sent by the designated applications that are automatically started at startup have been processed. At this time, the number of background broadcasts in the stack corresponding to the background broadcasts will be reduced, that is, the number of background broadcasts sent by the screen mirroring application will be reduced. The number of background broadcasts processed before broadcasting will be reduced. If the screen mirroring application sends a startup completion notification to the screen mirroring service in the form of background broadcast, the time the screen mirroring service waits for the startup completion notification will be shortened. As a result, the screen mirroring service will The communication time between the application and the screen casting process will also be relatively reduced. Correspondingly, the black screen time will also be shortened, which will not cause strong resentment among users. There is no need to change the broadcast method of the screen casting application, that is, it will still use the default Send notification of startup completion through background broadcast. Moreover, the priority of foreground broadcast is higher than that of background broadcast, that is, the operating system will process the foreground broadcast first and then the background broadcast. Therefore, the newly generated foreground broadcast will affect the processing process of the existing background broadcast, thus affecting these The background broadcast corresponds to the normal operation of the application. Therefore, in order to ensure the normal operation of the display device 200, when the black screen duration is relatively short, try to avoid using the foreground broadcast method to communicate between the screen casting application and the screen casting service.

Take the wireless screen projection function as an example, as shown in Figure 20, including the following steps:

Step 2001: The wireless projection function page receives instructions;

Step 2002: The wireless screen projection function page sends the instruction to the wireless screen projection service;

During implementation, the customer issues instructions in advance through the wireless screen projection function page, and the wireless screen projection function page sends the instructions to the wireless screen projection service by executing the above steps 2001 and 2002;

Step 2003: The wireless screen mirroring service obtains that the startup status of the operating system is startup completed, and generates a startup notification; the startup notification includes instruction information instructing the screen mirroring application to use background broadcast, such as Background;

Step 2004: The wireless screen mirroring service sends the startup notification to the wireless screen mirroring application;

Step 2005: Start the wireless screen projection application and generate a startup completion notification;

Step 2006: The wireless screen projection application sends a startup completion notification to the wireless screen projection service in the form of background broadcast;

Step 2007: The wireless screen projection service transmits the startup completion notification to the wireless screen projection process;

Step 2008: The wireless projection process drives the display;

Step 2009: The monitor displays the wireless projection function page.

In the above steps, the entrance of the wireless screen projection function page passes the instruction to the wireless screen projection service, and the wireless screen projection service The service obtains that the startup status of the operating system is startup completed. The wireless screen mirroring service generates a startup notification based on the startup status of the operating system. The startup notification includes instruction information instructing the screen mirroring application to use background broadcast, such as Background, and will This startup notification is sent to the wireless screen mirroring application. After the wireless screen mirroring application is started, it sends a startup completion notification to the wireless screen mirroring service in the form of background broadcast. The wireless screen projection service transmits the activation completion notification to the wireless screen projection process, so that the wireless screen projection process drives the display to display the wireless screen projection function page.

In some embodiments, after the operating system is started, there are still many background broadcasts. At this time, if the screen casting application still sends a startup completion notification to the screen casting service in the form of background broadcast, there will still be many background broadcasts. A long waiting time results in a longer communication time between the screen mirroring application and the screen mirroring service, resulting in a longer black screen time. In order to solve the above problem, the screen projection service obtains the number of background broadcasts in the stack after obtaining the startup status of the operating system as Startup Complete according to the instructions passed at the entrance of the screen projection function page. Among them, if the number of background broadcasts in the stack is greater than or equal to the quantity threshold, it means that the number of background broadcasts is still large, and the screen casting application needs to use foreground broadcast to send a startup completion notification to the screen casting service. If the number of background broadcasts in the stack is less than the quantity threshold, it means that the number of background broadcasts is small, and the screen mirroring application can use background broadcasts to send a startup completion notification to the screen mirroring service.

Take the wireless screen projection function as an example, as shown in Figure 21, including the following steps:

Step 2101: The wireless projection function page receives instructions;

Step 2102: The wireless screen projection function page sends the instruction to the wireless screen projection service;

During implementation, the customer issues instructions in advance through the wireless screen projection function page, and the wireless screen projection function page sends the instructions to the wireless screen projection service by executing the above steps 2101 and 2102;

Step 2103: The wireless screen projection service obtains that the startup status of the operating system is startup completed;

Step 2104: The wireless screen projection service determines whether the number of background broadcasts in the stack is greater than the quantity threshold;

Step 2105: If not, generate a startup notification and send it to the wireless screen projection application; the startup notification includes instruction information instructing the screen projection application to use foreground broadcast, such as Foreground;

Step 2106: If so, generate a startup notification and send the startup notification to the wireless screen projection application; the startup notification includes instruction information instructing the screen projection application to use background broadcast, such as Background;

Step 2107: Start the wireless screen projection application and generate a startup completion notification;

Step 2108: The wireless screen projection application broadcasts the startup completion notification to the wireless screen projection service;

Step 2109: The wireless screen projection service transmits the startup completion notification to the wireless screen projection process;

Step 2110: Wirelessly project the screen to drive the display;

Step 2111: The monitor displays the wireless projection function page.

In the above steps, the entrance of the wireless screen projection function page passes the instruction to the wireless screen projection service. The wireless screen projection service obtains that the startup status of the operating system is startup completed. The wireless screen projection service obtains the stack according to the startup status of the operating system. The number of background broadcasts within. Among them, if the number of background broadcasts is greater than or equal to the quantity threshold, a startup notification is generated. The startup notification includes instruction information instructing the screen casting application to use foreground broadcasting, such as Foreground, and the startup notification is sent to the wireless screen casting application. After launching the wireless screen mirroring application, After completion, a notification of completion of startup is sent to the wireless screen projection service through front-end broadcast. If the number of background broadcasts is less than the quantity threshold, a startup notification is generated. The startup notification includes instruction information instructing the screen mirroring application to use background broadcasting, such as Background, and the startup notification is sent to the wireless screen mirroring application. After the wireless screen mirroring application is started, it sends a startup completion notification to the wireless screen mirroring service in the form of background broadcast. The wireless screen projection service transmits the activation completion notification to the wireless screen projection process, so that the wireless screen projection process drives the display to display the wireless screen projection function page.

In some embodiments, the startup status of the operating system is startup completed, and the number of background broadcasts in the stack is greater than or equal to the quantity threshold. The screen casting application can also directly establish communication with the screen casting process to directly notify the startup completion Send to the screen casting process.

In one implementation, the startup status of the operating system is startup completed, and the target communication method is that the screen projection application directly sends a startup completion notification to the screen projection process.

Take the wireless screen projection function as an example, as shown in Figure 22, including the following steps:

Step 2201: The wireless screen projection function page (wireless screen projection shown in Figure 22) receives instructions;

Step 2202: The wireless screen projection function page sends the instruction to the wireless screen projection service;

During implementation, the customer issues instructions in advance through the wireless screen projection function page, and the wireless screen projection function page sends the instructions to the wireless screen projection service by executing the above steps 2201 and 2202;

Step 2203: The wireless screen projection service obtains that the startup status of the operating system is startup completed, and generates a startup notification;

Step 2204: The wireless screen mirroring service sends a startup notification including startup to the wireless screen mirroring application;

Step 2205: Start the wireless screen projection application and generate a startup completion notification;

Step 2206: The wireless screen mirroring application establishes communication with the wireless screen mirroring process and sends a startup completion notification to it;

Step 2207: The wireless projection process drives the display screen;

Step 2208: The monitor displays the wireless screen projection function page.

The entrance to the wireless screen mirroring function page in the above steps passes the instruction to the wireless screen mirroring service. The wireless screen mirroring service obtains that the startup status of the operating system is startup completed, and sends a startup notification including startup to the wireless screen mirroring application. . After the wireless screen mirroring application is started, you can refer to the startup status of the operating system as starting and the process of direct communication between the screen mirroring application and the screen mirroring process as mentioned above, which will not be described again here. Therefore, through direct communication between the screen casting application and the screen casting process, the communication time between the screen casting application and the screen casting process can be further shortened, thereby effectively shortening the black screen time.

In addition, when implementing screencasting based on the airplay function, the user can activate the screencasting function in the display device through the signal source port provided in the display device and display the corresponding screencasting information, and then wait for the user to operate the smart device Establish a connection with the display device for screencasting. However, there is currently a phenomenon that the display device does not respond to the return command received on the screencasting information page, which seriously affects the user experience, as shown in Figure 23 and Figure 24 below.

The user interface 21 shown in FIG. 23 exemplarily shows the signal source page, where the user interface 21 includes: an area 201 for displaying the signal source page. The area 201 can be all or part of the display area of the entire display, Furthermore, this disclosure does not limit parameters such as the display position, display size, color, text display style, etc. of the area 201. As shown in Figure 23, the signal source page can be suspended and displayed above the page originally displayed by the display device and close to the left edge. The brightness, color, transparency and other display parameters of the page originally displayed by the display device can be adjusted to Highlight the source page.

The area 201 may include an area 201a and multiple areas 201b. Area 201 is used to display the name of the signal source page. The name can be in any language. For example, in Figure 23, the Chinese "signal source" is used. Area 201b is used to display signal sources. Each area 201b corresponds to a signal source. For example, Figure 23 contains 6 signal sources, namely "Home Page", "Live Broadcast", "Air Play", "HDMI1", "HDMI2" and "HDMI3", the signal source selected by the user can be reflected in different display styles. For example, the text size in the area 201b corresponding to the signal source selected by the user is enlarged and bold, and the area 201b is filled with an obviously different color. .

Based on the user interface 21 shown in Figure 23, the user can select one of the multiple signal sources displayed on the signal source page as the current signal input source of the display device, and receive the data input by the signal source for analysis and display. For example, if the user selects real-time live broadcast as the current signal source, the display device 200 receives real-time broadcast and television data as signal input to display the radio and television content; for another example, if the user selects air play as the current signal source, the display device 200 can initiate screencasting. The smart device receives and analyzes the screen projection data and displays it.

The device may support multiple different airplay protocols for screencasting, for example, Miracast protocol or airplay protocol may be used. Among them, different air play protocols have different specifications. For example, when airplay is implemented through the airplay protocol, when the user selects airplay as the current signal source on the signal source page, based on the specifications of the airplay protocol, the display device 200 will be required to jump to the screen casting information page, where the screen casting information page The information page can display the name of the display device, the name of the WiFi currently connected to the display device, etc., and the screen casting information page can also provide other function entrances. After the display device 200 jumps to the screen casting information page, it can wait Users operate smart devices to mirror the screen, directly operate the application to mirror the screen, etc. The screen casting information page displays information about the display device and WiFi to be connected to the user, which ensures that the user can select the correct display device and connect to the correct WiFi when operating on the smart device to avoid the problem of screen casting failure. .

For example, based on the user interface 21 shown in Figure 23, if the user selects air play as the signal source, the display device 200 can jump to the user interface 31 shown in Figure 24 to display the screen projection information page. Referring to FIG. 24 , the user interface 31 includes: area 301 , area 302 , area 303 , entrance 304 and area 305 .

Among them, area 301 is used to display some introductory instructions for Air Play, for example, "Air Play, share content on your mobile phone, PAD or MAC through a wireless network", and can display related Air Play icons. Area 302 is used to display the name of the WiFi to which the display device is connected. Area 303 is used to display the name of the display device.

The entrance 304 is used to enter the air play setting page. The air play setting page can modify the name of the display device, change the WiFi currently connected to the display device, and so on.

Area 305 is used to display prompt information related to air play, for example, the text prompt content "Please ensure that your mobile phone, PAD or MAC is connected to the WiFi network connected to this device. If you want to get more information, please visit xxxxxx website".

After entering the screen mirroring information page, the display device will wait for the user to operate the smart device to mirror the screen. In some cases, the user may not want to proceed with the next step of screencasting, and usually the user will operate the control device to return. However, when the current display device implements screen casting based on the AirPlay protocol, after entering the screen casting information page through the signal source page, the user sends a return instruction to the display device 200 by operating the return button on the mobile terminal 300 or the control device 100. The display device 200 does not respond to the return command on the screen casting information page. This may make the user think that the display device is stuck or there is an error in the screen casting function. This is not in line with the user's usage habits and may also cause the user to use the air play function. The experience is poor.

In order to solve this problem, the present disclosure adds corresponding business logic to the display device 200, so that the display device 200 responds to the return instruction of the screen projection information page and jumps to the pre-specified page, which is not only in line with the user's usage habits, but also more convenient. Improve user experience. Among them, the processing logic can be set flexibly. For example, the return instructions of the screen projection information page can be specified to be uniformly returned to a specified page. The processing logic is simple; or, the active data in the display device before entering the screen projection information page can also be analyzed. Data source objects set different processing logic for different data source objects. This method is also more in line with users' usage habits.

In this disclosure, the instructions or requests sent by the mobile terminal 300, the control device 200 and the smart device are first transmitted to the kernel layer, and the airplay SDK in the kernel layer parses the received return instructions. In some cases, the airplay SDK in the kernel layer parses the received return instructions. The playback SDK can process the received instructions or requests internally. In other cases, the air playback SDK needs to call the relevant components of the upper system library layer to pass the received instructions or requests to the upper system library layer, and then through The relevant components in the system library layer pass the instructions or requests to the target application in the application layer for processing in response to the instructions or requests.

Next, the calling process between components involved when the display device responds to the return command and the processing flow of each component will be introduced in detail through the embodiments shown in FIGS. 25 to 27 .

Figure 25 is a schematic flowchart of a display device control method according to one or more embodiments of the present disclosure. Please refer to Figure 25. This embodiment includes:

S2501. Receive a return instruction generated by the user by operating the return button of the control device.

S2502. Respond to the return command and determine whether the screen projection information page is currently displayed. The screen projection information page meets the requirements of the specified air play protocol.

Among them, the specified airplay protocol is the airplay protocol.

S2503. When it is determined that the display is currently displaying the screen projection information page, control the display to return to display the pre-specified page.

Based on the above, there are at least the following two implementation methods: (1) Based on different pre-casting channels, entering the screen casting information page can uniformly return to the desktop of the Android system; (2) Based on the startup state before entering the screen casting information page The data source object returns to the specified page corresponding to the data source object. Among them, Figure 26 and Figure 27 respectively show schematic diagrams of the component calling processes corresponding to the above two implementation methods.

Referring to Figures 26 and 27, combined with the software configuration embodiment shown in Figure 4, the AirPlay SDK receives the return command and analyzes it to determine whether the screen projection information page is currently displayed. If so, step S603 is executed; If not, the AirPlay SDK will respond to the return command. In other words, the return command will be passed upward only when it is determined that the display is currently displaying the screen projection information page, otherwise it will be processed within the air play function.

Among them, the return command is passed upward mainly to design the AirPlay SDK, the startup service in the system library layer, and the AirPlay application in the application layer. The difference between Figure 26 and Figure 27 is that the processing method after the return command is transmitted to the AirPlay application is different, but the interaction process between the front-end AirPlay SDK, startup service and AirPlay application is the same. . Therefore, here we first introduce the front-end processing flow of return instructions.

Specifically, the return instruction is sent to the AirPlay application in a broadcast manner by calling the AirPlay SDK, so that the AirPlay application responds to the return instruction and controls the display to return to display the pre-specified page.

In the Android system, the AirPlay SDK in the kernel layer cannot communicate directly with the application layer and needs to rely on components in the middle layer. Therefore, the AirPlay SDK needs to forward the received return instructions to the system library layer first. The startup service is then called to broadcast the return instruction to send the return instruction to the AirPlay application in the application layer, so that the AirPlay application responds to the return instruction and returns to the pre-specified page.

In some embodiments, the startup service can monitor socket connections, and the AirPlay SDK can forward the return command to the startup service in the form of a socket. A socket is an abstraction of an endpoint for two-way communication between different application processes in the network. A socket can be understood as one end of process communication. During communication, the AirPlay SDK writes the return command into the socket corresponding to the underlying driver, and then sends the return command to the socket corresponding to the startup service through the transmission medium between the AirPlay SDK and the startup service. The startup service starts from itself. Read the return instruction from the corresponding socket. Among them, the communication efficiency between data components transmitted through socket is relatively high, which can improve the processing speed of the display device.

It can be understood that the AirPlay SDK can also send return instructions to the startup service through other methods. For example, the return instructions can also be transmitted through broadcast or Binder. Among them, the broadcast method is simple and easy to implement; the Binder method has better performance and stronger real-time performance. The way the AirPlay SDK transmits return instructions to the startup service can be flexibly set according to needs.

Next, the processing method of the air play application program's response to the return command in the embodiments shown in FIG. 26 and FIG. 27 will be introduced respectively.

For the above implementation method (1), as shown in Figure 26, it needs to be implemented through the intent component and the Android desktop launcher component (Launcher).

For the above implementation method (2), as shown in Figure 27, it is necessary to use the activity manager, the target application (the data source object in the startup state before entering the screencast information page), the intent component, and the Android desktop startup component.

In the embodiment shown in Figure 26, for the above implementation method (1), whether it is on the desktop of the Android operating system, HDMI or other signal source channels, enter the signal source page through the signal source entrance and then enter air playback, or The relevant page of the application installed in the display device enters the signal source page through the signal source entrance and then enters Air Play. When receiving the return command, it returns to the desktop of the Android operating system. Returning to the desktop of the operating system requires restarting the desktop. Start the component.

Specifically, the AirPlay application responds to the return instruction to execute the operation of ending the AirPlay application. The activity manager pops the task corresponding to the AirPlay application from the top of the stack and controls the closing of the window corresponding to the AirPlay application. Thereby closing the screen projection information page; further, the corresponding description data is generated for the return instruction through the intent component. The Android system determines that the component to be called is the Android desktop startup component through the description data, and then calls the Android desktop startup component to restart. Start the operating system desktop and display it. This business logic can not only meet the user's usage habits, but also solve the problem of the display device not responding to return instructions on the screen projection information page, and the implementation complexity is relatively simple.

In the embodiment shown in Figure 27, for the above implementation method (2), different pages are returned for different pre-screening channels, which is more targeted and more consistent with the business logic of "going back and forth from where to go" and the user's needs. Usage habits can give users a better experience. Specifically, after the AirPlay application receives the return command, it can obtain the value of the custom parameter, and determine whether to return to the desktop of the Android system or the main page of the application based on the value of the custom parameter.

Custom parameters can indicate whether the data source object in the startup state before entering the screen projection information page belongs to a signal source supported by the display device or an application installed in the display device. Assume that the custom parameter is launch source. The launch source value corresponding to any signal source is the same. The launch source value corresponding to different applications can be the same or different. This disclosure does not limit this. For example, if the launch source value corresponding to any signal source is the same, the airplay application is relatively certain that the launch source value is equal to the default value, which means that the display device enters airplay under the signal source. It is relatively certain that the launch source value is not equal to the default value. The value indicates that the display device enters airplay under the application; if the launch source is equal to the default value, it is determined that you need to return to the desktop of the Android system; if the launch source is not equal to the default value, you are determined to return to the main page of the application .

The present disclosure does not limit the size of the preset value. For example, the preset value can be 1, 0, or other numerical values. In addition, the launch source can be updated by the activity manager based on the tasks of each application in the launched state. After receiving the return command, the AirPlay application always needs to obtain the latest launch source value from the activity manager.

In the embodiment shown in Figure 27, the specific processing flow after it is determined to return to the desktop of the Android system is consistent with the processing flow of the embodiment shown in Figure 26. Reference can be made to the description of the embodiment shown in Figure 26. For the sake of simplicity, this No further details will be given.

If it is determined that it is necessary to return to the main page of the application, in response to the return command, the operation of ending the AirPlay application is executed. The activity manager pops the task corresponding to the AirPlay application from the top of the stack and controls the closing of the AirPlay application. corresponding window to close the screencasting information page; after that, you can use the activity manager to push the task corresponding to the target application that is to be restored to the startup state to the top of the stack and gain focus, and then restart the corresponding task of the target application. task, and display the window corresponding to the target application, and display the main page provided by the target application in the window.

Next, the embodiments shown in FIGS. 28 to 30 are used to illustrate the changes in the user interface in the display device when the aforementioned two different implementation methods are adopted.

Referring to Figure 28, according to the interface sequence shown by the arrow, the display device responds to the user's operation of the message on the remote control. The command generated by the signal source button displays the signal source page on the desktop of the Android system. Then, the user selects Air Play as the signal source from multiple signal sources, starts the Air Play function, and the display device jumps to the center shown The screen projection information page, and then receives the return command generated by the user operating the return button on the remote control, and the display device returns to the Android system desktop from the screen projection information page.

Please refer to Figure 29. According to the interface sequence shown by the arrow, the display device responds to the instructions generated by the user operating the signal source button on the remote control and displays the signal source page on the top of the desktop of the Android system; then, the user selects the signal source page from multiple signal sources. Select AirPlay as the signal source, start the AirPlay function, the display device will jump to the screen casting information page, and enter the AirPlay setting page through the AirPlay setting entrance in the screen casting information page; after that, the user can Establish a connection with the display device through screen mirroring or directly operate the cast button on the multimedia content playback page provided by the mobile phone application and display the cast content display page on the display device; in the process of displaying the cast content , the display device receives the return command generated by the user's operation of the return button on the remote control, and the display device first returns from the projection content display page to the projection information page; after that, the display device again receives the return command generated by the user's operation of the return button on the remote control. Return command, the display device will jump from the screen projection information page to the desktop of the Android system.

Please refer to Figure 30. According to the interface sequence shown by the arrow, the display device is displaying the main page of application 1 installed in the display device; after that, the display device responds to the instructions generated by the user operating the signal source button on the remote control. The signal source page is displayed on the main interface of Application 1; then, the user selects air play as the signal source from multiple signal sources, starts the air play function, and the display device jumps to the screen casting information page; after that, the user can directly By operating the screen casting button or screen mirroring in the multimedia content playback page provided by the mobile phone application, establish a connection with the display device and display the screen casting content on the display device; during the process of displaying the screen casting content, the display device receives The user operates the return button on the remote control to generate a return instruction, and the display device first returns from the projection content display page to the projection information page; after that, the display device again receives the return instruction generated by the user operating the return button on the remote control, and displays The device will jump from the screencasting information page to the main page of Application 1.

As shown in Figure 29 and Figure 30, the first return command received by the display device is processed internally by the AirPlay SDK, and the second return command is uploaded by the AirPlay SDK to the AirPlay application by starting the service. deal with.

With reference to the embodiments shown in Figures 28 to 30, by using the display device control method provided by the present disclosure, the display device can respond to the return instruction for the screen projection information page with a unified strategy or a more flexible and targeted strategy. , control page jumps to meet the user's usage habits, and can improve the user's experience using the air playback function of the display device.

In addition, the normal use of the air playback function mentioned above requires the business certificate MFI key (Made for iPhone/iPod/iPad, used mainly for legality verification of Apple devices) and FairPlay Key (used to decrypt files protected by FairPlay digital copyright protected encrypted multimedia content).

In order to ensure the security of business credentials, the currently commonly used method of writing business credentials is to write the business credentials to the display device in the production environment. However, on the one hand, writing business credentials to relevant equipment in the production environment causes the production progress to depend on the certification progress of the business credentials. If the display device does not pass the certification of the business party, there will be no It is impossible to obtain business credentials, thereby affecting the production progress of the display device; on the other hand, writing business credentials to related devices in the production environment will also result in that once the business credentials are written into the display device and delivered to the user, the business credentials cannot be changed. When the business credentials are abnormal or need to be updated, the business credentials in the display device cannot be rewritten. Therefore, how to safely write business credentials to the display device after the display device is delivered is an urgent problem that needs to be solved.

In some embodiments, the present disclosure writes the first encryption key to the display device 200 and uploads the business certificate corresponding to the display device 200 and the first decryption key corresponding to the first encryption key to the server 400 . When the display device 200 needs to write a business certificate, the display device 200 reads the written first encryption key through the controller 250, generates a first device signature based on the first encryption key, and then sends the first device signature to the server 400 through the controller 220. Send a credential acquisition request carrying the signature of the first device. The server 400 authenticates the display device 200 based on the first decryption key and the first device signature. If the display device 200 passes the authentication, the server 400 sends the business voucher corresponding to the display device 200 to the display device 200 . After receiving the business voucher sent by the server 400, the display device 200 saves the business voucher to a preset storage location to complete writing the business voucher. Since the server 400 will only send the service credentials to the display device 200 when it is sure that the display device 200 has passed the authentication, the above embodiment can prevent illegal devices from stealing the service credentials of the display device 200 from the server 400, thereby ensuring the business credentials. security.

In some embodiments, the implementation of the display device 200 generating the first device signature according to the first encryption key written in the display device 200 may include: the controller 250 of the display device 200 passing the first encryption key pair The first file is encrypted to obtain the first encrypted file; and summary information of the first file is obtained based on a preset algorithm, and the first device signature is generated based on the first encrypted file and the summary information. Correspondingly, the implementation of the server 400 to authenticate the display device 200 based on the first device signature may include: the server 400 parses the first device signature to obtain the first encrypted file and the summary information of the first file, based on The first decryption key corresponding to the first encryption key decrypts the first encrypted file to obtain the decrypted data corresponding to the first encrypted file, and then obtains the decrypted data corresponding to the first encrypted file based on the preset algorithm. summary information, and finally compare whether the summary information of the decrypted data corresponding to the first encrypted file is the same as the summary information carried in the certificate acquisition request; if they are the same, it is determined that the display device 200 has passed the authentication; if they are different, it is determined that the display device 200 has been authenticated. The right does not pass.

In some embodiments, in order to ensure the validity of the first encryption key written into the display device 200, after writing the first encryption key into the display device 200, the controller 250 of the display device 200 also A second device signature will be generated based on the first encryption key; the communicator 200 of the display device 200 will also send an authentication request carrying the second device signature to the server 400, and receive the authentication request sent by the server 400. Authentication response; the controller 250 of the display device 200 will also determine that the first encryption key is valid when the authentication response indicates that the display device has passed the authentication. If the display device fails to pass the authentication, it is determined that the first encryption key is invalid. Correspondingly, after receiving the authentication request sent by the display device 200, the server 400 authenticates the display device 200 based on the second device signature carried in the authentication request, and returns the authentication result to the display device 200. In the above embodiment, the first encryption key is written into the display After the device 200 is installed, the validity of the first encryption key will also be verified. Therefore, the disclosed implementation can also avoid the display device 200 being unable to obtain the business certificate from the server 400 due to the invalid first encryption key written to the display device 200. This improves the reliability of writing business credentials to the display device.

In some embodiments, the second encryption key server 400 is also uploaded to the server, and the display device 200 is also written with a second decryption key corresponding to the second encryption key. The implementation of the server 400 sending the business voucher to the display device 200 may include: the server 400 sends to the display device 200 a second encrypted file that encrypts the business voucher using a second encryption key. After receiving the second encrypted file, the display device 200 obtains the second decryption key written to the display device, and decrypts the second encrypted file using the second decryption key to obtain the business voucher. . Among them, one way for the server 400 to obtain the second encrypted file is to upload both the second encryption key and the business voucher to the server 400, and the server 400 encrypts the business voucher according to the second encryption key to obtain the second encrypted file. File; Another implementation method for the server 400 to obtain the second encrypted file may be to directly upload the second encrypted file obtained by encrypting the business voucher with the second encryption key to the server 400 .

In some embodiments, in order to ensure the validity of the second decryption key written into the display device 200, the communicator 220 of the display device 200 will also write the second decryption key into the display device 200. , obtain the third encrypted file obtained by encrypting the preset file based on the second encryption key from the server 400, and the controller 250 of the display device 200 will also use the second decryption key to encrypt the third encrypted file. Perform decryption to obtain decrypted data, and compare whether the decrypted data obtained by decrypting the third encrypted file is consistent with the preset file, and if the decrypted data is consistent with the preset file, determine the second decryption The secret key is valid. If the decryption data is inconsistent with the preset file, it is determined that the second decryption key is invalid. In the above embodiment, after writing the second decryption key to the display device 200, the validity of the second decryption key will be further verified. Therefore, the disclosed implementation can avoid writing the second decryption key to the display device 200. The display device 200 cannot decrypt the encrypted business voucher due to the invalid decryption key, thereby improving the reliability of writing the business voucher to the display device.

In some embodiments, in order to avoid the second decryption key being stolen during the writing process, the implementation of writing the second decryption key to the display device 200 may include: the memory of the display device 200 receives the written third decryption key based on The encryption key encrypts the fourth encrypted file obtained by encrypting the second decryption key. The display device 200 controls the fourth encrypted file according to the third decryption key preset in the software system of the display device. Decrypt to obtain the second decryption key. Wherein, the third decryption key is the decryption key corresponding to the third encryption key. Since the second decryption key has been encrypted during the writing process, the writing-related personnel or equipment can only obtain the fourth encrypted file obtained by encrypting the second decryption key based on the third encryption key, but cannot obtain the decryption Therefore, the above embodiment can prevent the second decryption key from being stolen during the writing process.

In some embodiments, in order to avoid the first encryption key being stolen during the writing process, the display device 200 writes the first encryption key in an implementation manner that may include: the memory of the display device 200 receives the written third encryption-based The display device 200 controls the fifth encrypted file obtained by encrypting the first encryption key with the secret key according to the third decryption key preset in the software system of the display device. decrypt to obtain Get the second decryption key. Wherein, the third decryption key is the decryption key corresponding to the third encryption key. Since the first encryption key has been encrypted during the writing process, the writing-related personnel or equipment can only obtain the fifth encrypted file obtained by encrypting the first encryption key based on the third encryption key, but cannot obtain the decryption Therefore, the above embodiment can prevent the first encryption key from being stolen during the writing process.

Figure 31 shows a schematic interactive flow diagram of a business credential writing method according to some embodiments in an embodiment of the present disclosure. As shown in Figure 31, the business credential writing method according to some embodiments includes the following steps:

S3101. The display device generates a first device signature according to the first encryption key written in the display device.

In some embodiments, the first encryption key may be written to the display device in a production environment. That is, the first encryption key is written to the display device in the production environment. When the display device needs to obtain the business voucher, it reads the first encryption key written in the production environment and generates the first encryption key based on the first encryption key. A device signature.

Since the first encryption key is used to authenticate the display device in the embodiment of the present disclosure, the first encryption key corresponds to the display device one-to-one, and each display device has a unique first encryption key.

S3102. The display device sends a certificate acquisition request carrying the signature of the first device to the server.

Correspondingly, the server receives the certificate acquisition request sent by the display device and carries the signature of the first device.

Wherein, the credential acquisition request is used to request the server to return the business credential corresponding to the display device when it is determined that the display device is authenticated based on the first device signature.

In some embodiments, the credential acquisition request may be a registration request sent to the server when the display device is used online for the first time. After the server completes the authentication of the display device, it will send the business credentials corresponding to the display device to the display device.

The business certificate in the embodiment of the disclosure may be an MFI key, FairPlay Key, etc., which is not limited in the embodiment of the disclosure.

S3103. The server authenticates the display device according to the first device signature and the first decryption key corresponding to the first encryption key.

In this disclosed embodiment, the first encryption key and the first decryption key have a one-to-one relationship, and each display device has a unique first encryption key.

In some implementations, the first encryption key and the first decryption key may be keys in a symmetric encryption algorithm. That is, the first encryption key and the first decryption key are the same.

In some implementations, the first encryption key and the first decryption key may be a key pair in an asymmetric encryption algorithm, the first encryption key is a public key in an asymmetric encryption algorithm, and the first decryption key The secret key is the private key in the asymmetric encryption algorithm.

In the above step S3103, if the server determines that the display device fails to pass authentication based on the first device signature and the first decryption key corresponding to the first encryption key, the server may determine that the display device does not have Obtain the authority for the business voucher, and therefore refuse to send the business voucher to the display device, and if the server determines the display based on the first device signature and the first decryption key corresponding to the first encryption key If the device authentication passes, the server can determine that the display device has the authority to obtain the business voucher, and therefore executes the following step S3104.

S3104. The server sends the service voucher to the display device.

Correspondingly, the display device receives the service voucher sent by the server.

S3105. The display device writes the business voucher into a preset storage location of the display device.

In some embodiments, the preset storage location may be a storage location in a trusted execution environment (Trusted execution environment, TEE) of the display device.

Storing business credentials in a storage location in a trusted execution environment can prevent the business credentials from being stolen from the display device when they are written to the display device, thereby further improving the security of the business credentials.

According to the display device and business voucher writing method of some embodiments, first generate a first device signature based on the first encryption key written to the display device, and then send a voucher acquisition request carrying the first device signature to the server. , and receive the business voucher sent by the server, and write the business voucher into a preset storage location of the display device. On the one hand, since the embodiment of the present disclosure writes the business voucher to the display device by obtaining the business voucher from the server and writing the business voucher obtained from the server to the preset storage location, the embodiment of the present disclosure can be used in any Write business credentials to the display device at this stage, instead of being limited to writing business credentials to the display device in the production environment. On the other hand, since the credential acquisition request carries the display device to generate a first device signature based on the first encryption key written to the display device, and the server can only determine that the display device has passed the authentication based on the first device signature. The business voucher corresponding to the display device will be sent to the display device only under the condition. Therefore, the embodiment of the present disclosure can prevent illegal devices from stealing the business voucher of the display device from the server, thereby ensuring the security of the business voucher. To sum up, the embodiments of the present disclosure can safely write business credentials to the display device after the display device is delivered, solving the problem of writing business credentials to the display device in the production environment that affects the production progress and cannot be rewritten. The problem.

As an expansion and refinement of the embodiment shown in Figure 31 above, the embodiment of the present disclosure provides another method of writing business credentials. Referring to Figure 32, the interactive flow chart of the method of writing business credentials includes the following steps:

S3201. The display device encrypts the first file according to the first encryption key written in the display device, and obtains the first encrypted file.

The first file in the embodiment of the present disclosure can be any file.

In some embodiments, the display device may randomly generate a text file containing a plurality of characters as the first file.

S3202. The display device obtains summary information of the first file based on a preset algorithm.

In some embodiments, the above step S3202 (obtaining summary information of the first file based on a preset algorithm) may include:

Hash calculation is performed on the first file based on a hash algorithm, and a hash value obtained by hash calculation on the first file is used as the digest information of the first file.

For example, the first file can be hashed based on the SHA256 algorithm (a hash algorithm with a hash value length of 256 bits), and the obtained hash value can be used as the digest information of the first file.

S3203. The display device generates the first device signature according to the first encrypted file and the summary information.

In some embodiments, the first encrypted file and the summary information may be directly encapsulated into the same data. data packet, and the encapsulated data packet is used as the signature of the first device.

S3204. The display device sends a certificate acquisition request carrying the signature of the first device to the server.

S3205: The server parses the first device signature to obtain the first encrypted file and the summary information.

S3206. The server decrypts the first encrypted file using the first decryption key, and obtains the decrypted data corresponding to the first encrypted file.

S3207. The server obtains the summary information of the decrypted data corresponding to the first encrypted file through the preset algorithm.

It should be noted that the algorithm used by the server to obtain the summary information of the decrypted data corresponding to the first encrypted file is consistent with the algorithm used by the display device to obtain the summary information of the first file.

S3208: The server compares whether the summary information of the decrypted data corresponding to the first encrypted file is the same as the summary information of the first file.

When the display device is a legal display device, since the encryption key (first encryption key) for generating the first encrypted file and the decryption key (first decryption key) for decrypting the first encrypted file are a key pair, Therefore, the decrypted data obtained by the server is the first file, and because the algorithm used by the display device and the server to obtain summary information is the same, the summary information obtained should also be the same; and when the display device is an illegal device, because the first encrypted data is generated The encryption key of the file (first encryption key) and the decryption key (first decryption key) for decrypting the first encrypted file are not a key pair. Therefore, the decrypted data obtained by the server will not be the same as the first file, and thus This will cause the obtained summary information of the decrypted data to be different from the summary information of the first file. Therefore, in the embodiment of the present disclosure, it is possible to determine whether the summary information of the decrypted data corresponding to the first encrypted file is the same as the summary information of the first file. To determine whether the display device has passed the authentication.

That is, in the above-mentioned step S3208, if the summary information of the decrypted data corresponding to the first encrypted file is different from the summary information of the first file, it can be determined that the display device fails to authenticate, and the message is never sent to the display device. Business voucher; if the summary information of the decrypted data corresponding to the first encrypted file is the same as the summary information of the first file, it can be determined that the display device has passed the authentication and the following subsequent steps are performed.

S3209: The server sends the service voucher to the display device.

S3210. The display device writes the business voucher into a preset storage location of the display device.

The first encryption key written to the display device may be invalid because it is not the encryption key corresponding to the first decryption key, resulting in the display device being unable to obtain services from the server. certificate. In order to ensure the validity of the first encryption key written into the display device, after the first encryption key is written into the display device, the business voucher writing method according to some embodiments also performs the writing on the display device. The validity of the first encryption key in the device is verified. Referring to Figure 33, the process of verifying the validity of the first encryption key written in the display device includes the following steps:

S3301. The display device generates a second device signature based on the first encryption key.

In some embodiments, the implementation manner in which the display device generates the second device signature based on the first encryption key may be the same as the implementation manner in which the display device generates the second device signature based on the first encryption key.

In some embodiments, the display device may generate a second device signature based on the first encryption key by encrypting a specified file using the first encryption key to obtain the second device signature.

S3302. The display device sends an authentication request carrying the signature of the second device to the server.

Correspondingly, the server receives the authentication request sent by the display device and carries the signature of the second device.

Wherein, the authentication request is used to request the server to authenticate the display device according to the second device signature.

S3303. The server authenticates the display device according to the second device signature and the first decryption key.

In some embodiments, the display device generates the second device signature based on the first encryption key in the same manner as the display device generates the second device signature based on the first encryption key. At this time, the server The implementation of authenticating the display device based on the first decryption key corresponding to the second device signature and the first encryption key is the same as the implementation of authenticating the display device based on the first device signature and the first encryption key. The implementation of the first decryption key for authenticating the display device is the same.

In some embodiments, the implementation of the display device generating a second device signature based on the first encryption key may include: encrypting a specified file using the first encryption key to obtain the second device signature, At this time, the server authenticates the display device according to the first decryption key corresponding to the second device signature and the first encryption key. The implementation method may be: through the first decryption key pair. Decrypt the second encrypted file, obtain the decrypted data corresponding to the second encrypted file, and determine whether the authentication of the display device is based on whether the decrypted data corresponding to the second encrypted file is the same as the specified file. pass.

S3304. The server sends an authentication response to the display device.

Correspondingly, the display device receives the authentication response sent by the server.

Wherein, the authentication response is used to indicate that the display device has passed the authentication, or the display device has failed to pass the authentication.

If the authentication response indicates that the display device has passed the authentication, the following step S3305 is executed. If the authentication response indicates that the display device fails the authentication, the following step S3306 is executed.

S3305. Determine that the first encryption key is valid.

S3306. Determine that the first encryption key is invalid.

In the above embodiment, after writing the first encryption key to the display device, the validity of the first encryption key will be further verified. Therefore, the disclosed implementation can avoid writing the first encryption key to the display device. The display device cannot obtain business credentials from the server due to an invalid key.

In some embodiments, triggering the verification of the validity of the first encryption key may be: in response to a user operation, starting to execute the process for verifying the validity of the first encryption key shown in Figure 33 .

For example: the user enters the hidden entrance of the display device, such as: Settings – Sound – Advanced Advance Settings, and press the remote control button "2022" to open the Outgoing Quality Control (OQC) application, select the target virtual button in the application interface and confirm, then start executing as shown in Figure 33 A process for verifying the validity of the first encryption key.

During the process of the server sending the business credentials to the display device, the business credentials may be intercepted, resulting in the business credentials being stolen. In order to ensure the security of the process of the server sending the business voucher to the display device, with reference to Figure 34, on the basis of the embodiment shown in Figure 31, the implementation of the above step S3104 (the server sends the business voucher to the display device) Methods may include:

S3104a. The server sends the second encrypted file to the display device.

Correspondingly, the display device receives the second encrypted file sent by the server.

Wherein, the second encrypted file is an encrypted file obtained by encrypting the business voucher based on a second encryption key.

In some embodiments, the implementation of the server obtaining the second encrypted file may include: the server receives the uploaded business voucher and the second encryption key, and encrypts the business voucher based on the second encryption key, to obtain the second encrypted file.

That is, the business voucher and the second encryption key are written to the server, and then the server encrypts the business voucher based on the second encryption key to generate the second encrypted file.

In some embodiments, the implementation of the server obtaining the second encrypted file may include: the server receiving the uploaded second encrypted file.

That is, the second encrypted file is directly written to the server.

In Figure 34, the implementation of obtaining the second encrypted file by the server includes: the server receives the uploaded business voucher and the second encryption key, and encrypts the business voucher based on the second encryption key to obtain the The second encrypted file is shown as an example, but in the embodiment of the present disclosure, the second encrypted file can also be directly uploaded to the server.

Compared with writing the business voucher and the second encryption key to the server, writing the second encrypted file to the server can prevent the business voucher from being stolen from the server, thereby further improving the security of the business voucher.

S3104b. The display device obtains the second decryption key written in the display device.

Wherein, the second decryption key is the decryption key corresponding to the second encryption key.

In some embodiments, the second decryption key may be written to the display device in a production environment.

In some implementations, the second encryption key and the second decryption key may be keys in a symmetric encryption algorithm. That is, the first encryption key and the first decryption key are the same.

In some implementations, the second encryption key and the second decryption key may be a key pair in an asymmetric encryption algorithm, the second encryption key is a public key in an asymmetric encryption algorithm, and the second decryption key The secret key is the private key in the asymmetric encryption algorithm.

S3104c. The display device decrypts the second encrypted file using the second decryption key to obtain the business voucher.

Since the server sends encrypted business credentials to the display device, the above embodiment can avoid business The credentials are stolen during the process of being sent from the server to the display device, further improving the security of the business credentials.

The second decryption key written to the display device may be invalid because it is not the decryption key corresponding to the second encryption key, causing the display device to obtain the encrypted data from the server. After decrypting the business voucher (second encrypted file), the business voucher cannot be decrypted. In order to ensure the validity of the second decryption key written into the display device, after the second decryption key is written into the display device, the business voucher writing method according to some embodiments also performs the writing on the display device. The validity of the second decryption key in the device is verified. Referring to Figure 35, the process of verifying the validity of the second decryption key written in the display device includes the following steps:

S3501. The server sends the third encrypted file to the display device.

Correspondingly, the display device receives the third encrypted file sent by the server.

Wherein, the third encrypted file is an encrypted file obtained by encrypting a preset file based on the second encryption key.

S3502. The display device decrypts the third encrypted file using the second decryption key, and obtains the decrypted data corresponding to the third encrypted file.

S3503. The display device compares whether the decrypted data corresponding to the third encrypted file is the same as the preset file.

In the above step S3503, if the decrypted data corresponding to the third encrypted file is the same as the default file, the following step S3504 is executed, and if the decrypted data corresponding to the third encrypted file is different from the default file , then execute the following step S3505.

S3504. Determine that the second decryption key is valid.

S3505. Determine that the second decryption key is invalid.

In the above embodiment, after the second decryption key is written into the display device, the validity of the second decryption key is further verified. Therefore, the disclosed implementation can avoid writing the second decryption key into the display device. The display device cannot decrypt the encrypted business credentials due to an invalid key.

The process of writing the second decryption key to the display device generally involves first issuing the second decryption key to the production system of the display device, and then writing the second decryption key into the display device by the production system of the display device. However, after the second decryption key is issued to the production system of the display device, the second decryption key may be stolen from the production system. In order to prevent the second decryption key from being stolen during the writing process of the display device, referring to Figure 36, the implementation of writing the second decryption key to the display device in the business voucher writing method according to some embodiments may include Follow these steps:

S3601. The display device receives the written fourth encrypted file.

Wherein, the fourth encrypted file is an encrypted file obtained by encrypting the second decryption key based on the third encryption key.

S3602. The display device decrypts the fourth encrypted file according to the third decryption key preset in the software system of the display device to obtain the second decryption key.

Wherein, the third decryption key is the decryption key corresponding to the third encryption key.

That is, the third decryption key is configured in the software system of the display device in advance, and the second decryption key issued to the production system of the display device is obtained by encrypting the second decryption key with the third encryption key. four plus The production system of the display device directly writes the fourth encrypted file to the display device, and the display decrypts the fourth encrypted file using the third decryption key to obtain the second decryption key.

In some implementations, the third encryption key and the third decryption key may be keys in a symmetric encryption algorithm. That is, the third encryption key is the same as the third decryption key.

In some implementations, the third encryption key and the third decryption key may be a key pair in an asymmetric encryption algorithm, the third encryption key is a public key in an asymmetric encryption algorithm, and the third decryption key The secret key is the private key in the asymmetric encryption algorithm.

Since the second decryption key of the production system issued to the display device is a fourth encrypted file obtained by encrypting the second decryption key with the third encryption key, even if the second decryption key is stolen, only the second decryption key can be stolen. The ciphertext of the second decryption key cannot be obtained, but the plaintext of the second decryption key cannot be obtained. Therefore, the above embodiment can prevent the second decryption key from being stolen during the process of writing to the display device, thereby improving the efficiency of the second decryption key. safety.

In some embodiments, the display device may decrypt the fourth encrypted file using a third decryption key after being written to the fourth encrypted file, and store the obtained second decryption key so that it is needed later. Read directly when using.

In some embodiments, the display device can decrypt the fourth encrypted file using the third decryption key only when the second decryption key needs to be used, obtain the second decryption key, and delete it after use. Since the display device stores the ciphertext that is also the second decryption key, the embodiment of the present disclosure can also prevent the second decryption key from being stolen in the display device, thereby further improving the security of the second decryption key.

The process of writing the first encryption key to the display device generally involves first issuing the first encryption key to the production system of the display device, and then writing the first encryption key to the display device by the production system of the display device. However, after the first encryption key is issued to the production system of the display device, the first encryption key may also be stolen from the production system. In order to prevent the first encryption key from being stolen during the writing process of the display device, referring to Figure 37, the implementation of writing the first encryption key to the display device in the business voucher writing method according to some embodiments may include Follow these steps:

S3701. The display device receives the fifth encrypted file written.

Wherein, the fifth encrypted file is an encrypted file obtained by encrypting the first encryption key based on a third encryption key.

S3702. The display device decrypts the fifth encrypted file according to the third decryption key preset in the software system of the display device to obtain the first encryption key.

That is, the third decryption key is configured in the software system of the display device in advance, and the first encryption key of the production system issued to the display device is the first encryption key obtained by encrypting the first encryption key with the third encryption key. Fifth encrypted file, the production system of the display device directly writes the fifth encrypted file to the display device, and the display decrypts the fifth encrypted file through the third decryption key to obtain the first encryption key.

Since the first encryption key of the production system issued to the display device is a fifth encrypted file obtained by encrypting the first encryption key with the third encryption key, even if the first encryption key is stolen, only the first encryption key can be stolen. to obtain the ciphertext of the first encryption key, but cannot obtain the plaintext of the first encryption key. Therefore, the above embodiment can avoid the third An encryption key is stolen during the process of writing to the display device, thereby improving the security of the first encryption key.

In some embodiments, the display device may decrypt the fifth encrypted file using a third decryption key after being written to the fifth encrypted file, and store the obtained first encryption key so that it is needed later. Read directly when using.

In some embodiments, the display device can decrypt the fifth encrypted file using the third decryption key only when the first encryption key needs to be used, obtain the first encryption key, and delete it after use. Since the display device stores the ciphertext that is also the first encryption key, embodiments of the present disclosure can also prevent the first encryption key from being stolen in the display device, thereby further improving the security of the first encryption key.

For convenience of explanation, the above description has been made in connection with the implementation in a certain embodiment of the present disclosure. However, the above discussion of some embodiments is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Various modifications and variations are possible in light of the above teachings. The above embodiments are selected and described to better explain the contents of the present disclosure, thereby enabling those skilled in the art to better use the embodiments.

Claims

A display device including:

A display configured to display a screen projection function page, where the screen projection function page contains screen projection information of the display device;

Controller, configured as:

In response to an instruction input by the user to display the screen projection function page, obtain a device identification, and the device identification is used to verify the permission of the display device to use the screen projection function;

If the device identification is not obtained, or it is verified based on the obtained device identification that the display device does not have the permission to use the screen projection function, the screen projection function will not be started, and the display will be controlled to be in a black screen state and display Prompt information;

After verifying that the display device has the permission to use the screen projection function based on the obtained device identification, the screen projection function is started, and after the screen projection function is started, the display is controlled to display the screen projection function page.
The display device according to claim 1, the controller further controls the display to display the first entrance, and the controller is further configured to:

In response to an entry instruction input by the user based on the first portal, controlling the display to display a first inquiry page, the first inquiry page being used to inquire the user whether to obtain the device identification again;

In response to an instruction input by the user to re-obtain the device identification, the device identification is obtained, and the display is controlled to display a waiting page.
The display device according to claim 2, the waiting page includes a countdown icon, the countdown icon includes a duration value and/or a progress icon, wherein the duration value is used to indicate that the controller obtains the device The remaining duration of the identification, the initial value of the duration value is the total duration expected by the controller to obtain the device identification, the progress icon is used to represent the progress of the controller in obtaining the device identification, the The total duration corresponding to the total progress obtained by the controller and identified by the device is equal to the initial value of the duration value.
The display device according to claim 2, the controller is further configured to:

Instructions to obtain the device identity again in response to instructions input by the user;

After obtaining the device identification, the controller is also configured to:

If the device identification is not obtained after re-obtaining the device identification at least once, or it is verified based on the obtained device identification that the display device does not have the permission to use the screen projection function, control the display to display an update failure page , the update failure page includes a designated number and an operation prompt, the designated number uniquely corresponds to the device identification, and the operation prompt is used to prompt the user to feed back the designated number to a third-party terminal or server to pass the third-party terminal Or the server updates the device identity.
The display device according to claim 4, the update failure page further includes a confirmation option, and the controller is further configured to:

In response to an instruction input by the user based on the confirmation option, the designated number is sent to the third-party terminal or server in a preset communication method.
The display device according to claim 1, the controller is further configured to:

Start the screen projection function, and control the display to display the screen projection function page after the screen projection function is started, including:

Through the screen casting service, the startup status of the operating system is obtained according to the instructions passed at the entrance of the screen casting function page, and a startup notification is sent to the screen casting application to start the screen casting application, wherein the startup notification is based on Generating a startup state of the operating system;

The screen projection application sends a startup completion notification to the screen projection process in the target communication mode corresponding to the startup state of the operating system according to the startup notification, so that the screen projection process drives the display to display the required information. Describe the screencasting function page.
The display device according to claim 6, the startup state of the operating system is starting, and the target communication mode is that the screen casting application transmits a startup completion notification to the screen casting process through the screen casting service. , the controller is also configured as:

Send the notification of completion of startup to the screen casting service in a foreground broadcast manner through the screen casting application;

The start-up completion notification is sent to the screen casting process through the screen casting service, so that the screen casting process drives the display to display the screen casting function page.
The display device according to claim 6, the target communication mode is that the screen projection application directly sends a startup completion notification to the screen projection process, and the controller is further configured to:

Establish a communication connection between the screen casting application and the screen casting process;

The start-up completion notification is sent to the screen casting process through the screen casting application, so that the screen casting process drives the display to display the screen casting function page.
The display device according to claim 1, further comprising:

The communicator is configured to: receive a return instruction generated by the user by operating a return button of the control device;

The controller is further configured to: respond to the return instruction, determine whether the display currently displays the screen projection information page, and the screen projection information page meets the requirements of the specified air play protocol; and determine whether the display currently displays the screen projection information page. When projecting an information page, the display is controlled to return to display a pre-specified page.
The display device according to claim 9, when the controller determines that the display is currently displaying the screen projection information page, controls the display to return to display a pre-specified page, and is configured as:

According to the data source object in the activated state before the display device enters the screen projection information page, the display is controlled to return to display the designated page corresponding to the data source object; different data source objects correspond to different designated pages.
The display device according to claim 10, the controller executes according to the data source object in the activated state before the display device enters the screen projection information page, and controls the display to return to display the specified data source object corresponding to the display device. Page, configured as:

If the data source object is a signal source supported by the display device, control the display to return to the desktop displaying the operating system of the display device;

If the data source object is an application installed in the application layer of the operating system of the display device, the display is controlled to return to display the main page corresponding to the application.
The display device according to claim 11, the controller is further configured to:

Get custom parameters;

Determine whether the value of the custom parameter is equal to the preset value;

If equal, it is determined that the data source object in the activated state before entering the screen projection information page is a signal source supported by the display device;

If not, it is determined that the data source object in the startup state before entering the screen projection information page is an application installed in the application layer of the operating system of the display device.
The display device according to claim 9, the controller is further configured to: when determining that the display is currently displaying the screen projection information page, calling the airplay software tool development kit SDK in the display device to The return instruction input by the communicator is sent to the airplay application program in a broadcast manner, so that the airplay application program responds to the return instruction and controls the display to return to display a pre-specified page.
The display device according to claim 13, the controller executes calling the AirPlay software tool development kit SDK in the display device to send the return instruction input by the communicator to AirPlay in a broadcast manner. Application, configured as:

The airplay SDK is called to forward the return instruction to the startup service, and the return instruction is broadcast by calling the startup service to send the return instruction to the airplay application.
The display device according to claim 14, the controller executes calling the airplay SDK to forward the return instruction to the startup service, and is configured to: call the airplay SDK to forward the return instruction to the start service in a socket manner. The return instruction is sent to the startup service.
The display device according to claim 9, when the controller determines that the display is currently displaying the screen projection information page, controls the display to return to display a pre-specified page, and is configured to: control the display to return to display The desktop of the operating system of the display device.
The display device according to any one of claims 9-16, further comprising:

A memory configured to write business credentials into a preset storage location of the display device;

The controller is further configured to generate a first device signature based on the first encryption key written to the display device;

The communicator is further configured to send a credential acquisition request carrying the first device signature to the server; the credential acquisition request is used to request the server to determine the display device authentication based on the first device signature. If the right is passed, the business voucher corresponding to the display device is returned;

Receive the service voucher sent by the server.
The display device according to claim 17, the controller performs generating a first device signature according to a first encryption key written in the display device, and is configured to:

Encrypt the first file using the first encryption key to obtain the first encrypted file;

Obtain summary information of the first file based on a preset algorithm;

The first device signature is generated based on the first encrypted file and the summary information.
The display device of claim 17, the controller, further configured to generate a second device signature based on the first encryption key after writing the first encryption key to the display device;

The communicator is also configured to send an authentication request carrying the signature of the second device to the server, and receive an authentication response sent by the server; the authentication request is used to request the server according to The second device signature authenticates the display device;

The controller is further configured to determine that the first encryption key is valid when the authentication response indicates that the display device is authenticated. If it fails, it is determined that the first encryption key is invalid.
The display device according to claim 17, the communicator performs receiving the service voucher sent by the server, and is configured to:

Receive a second encrypted file sent by the server, where the second encrypted file is an encrypted file obtained by encrypting the business voucher based on a second encryption key;

Obtain a second decryption key written to the display device, where the second decryption key is the decryption key corresponding to the second encryption key;

Decrypt the second encrypted file using the second decryption key to obtain the business voucher.
The display device according to claim 20, the communicator is further configured to receive a third encrypted file sent by the server after writing the second decryption key to the display device; the third The third encrypted file is an encrypted file obtained by encrypting the preset file based on the second encryption key;

The controller is further configured to decrypt the third encrypted file using the second decryption key to obtain decrypted data, and when the decrypted data is consistent with the preset file, determine that the The second decryption key is valid. If the decryption data is inconsistent with the preset file, it is determined that the second decryption key is invalid.
The display device according to claim 20, the memory is further configured to receive a written fourth encrypted file, the fourth encrypted file encrypts the second decryption key based on a third encryption key. The obtained encrypted file;

The controller is further configured to decrypt the fourth encrypted file according to a third decryption key preset in the software system of the display device to obtain the second decryption key; The third decryption key is the decryption key corresponding to the third encryption key.
The display device according to claim 17, the memory is further configured to receive a written fifth encrypted file, the fifth encrypted file encrypts the first encryption key based on a third encryption key. The obtained encrypted file;

The controller is further configured to decrypt the fifth encrypted file according to a third decryption key preset in the software system of the display device to obtain the first encryption key, and the third The third decryption key is the decryption key corresponding to the third encryption key.
A processing method for a display device, the method includes:

In response to an instruction input by the user to display the screen projection function page, obtain a device identification, and the device identification is used to verify the permission of the display device to use the screen projection function;

If the device identification is not obtained, or it is verified based on the obtained device identification that the display device does not have the permission to use the screen projection function, the screen projection function will not be started, and the display will be controlled to be in a black screen state and display Prompt information;

After verifying that the display device has the permission to use the screen projection function based on the obtained device identification, the screen projection function is started, and after the screen projection function is started, the display is controlled to display the screen projection function page.
The method according to claim 24, activating the screen projection function and displaying the screen projection function page after the screen projection function is started includes:

Through the screen casting service, the startup status of the operating system is obtained according to the instructions passed at the entrance of the screen casting function page, and a startup notification is sent to the screen casting application to start the screen casting application, wherein the startup notification is based on Generating a startup state of the operating system;

The screen projection application sends a startup completion notification to the screen projection process in the target communication mode corresponding to the startup state of the operating system according to the startup notification, so that the screen projection process drives the display to display the required information. Describe the screencasting function page.
The method of claim 24, further comprising:

Receive the return instruction generated by the user by operating the return button of the control device;

In response to the return instruction, determine whether the screen projection information page is currently displayed, and the screen projection information page meets the requirements of the specified air playback protocol;

When it is determined that the screen projection information page is currently displayed, the control returns to displaying the pre-specified page.
According to the method of claim 26, when it is determined that the projection information page is currently displayed, controlling the return to display a pre-specified page includes:

When it is determined that the display is currently displaying the screen projection information page, the data source object in the activated state before the display device enters the screen projection information page is determined;

Control the display to return to display the designated page corresponding to the data source object; wherein different data source objects correspond to different designated pages.
The method of claim 24, further comprising:

Generate a first device signature based on the first encryption key written to the display device;

Send a credential acquisition request carrying the first device signature to the server, where the credential acquisition request is used to request the server to return the display if it is determined that the display device is authenticated based on the first device signature. Business credentials corresponding to the device;

Receive the business voucher sent by the server;

Write the business voucher into a preset storage location of the display device.