CN117812320A - Display device and CEC device connection method applied to display device - Google Patents

Abstract

The application provides a display device and a CEC device connection method applied to the display device, when detecting that an HDMI port has CEC device access, HDMI module information of the CEC device is received from the CEC device. If the device information of the CEC device is found based on the configuration file according to the HDMI module information, a connection is established with the CEC device according to the device information and the logical address of the CEC device. If the device information of the CEC device is not found, a device information request is sent to the CEC device, the returned device information is received from the CEC device, and then a connection is established with the CEC device according to the device information and the logical address. In this way, the device information of the CEC device can be obtained from the configuration file without sending a device information request to the CEC device, and the efficiency of establishing connection between the display device and the CEC device is improved from the viewpoint of reducing CEC instructions.

Description

Display device and CEC device connection method applied to display device

Technical Field

The present invention relates to the technical field of display devices, and in particular, to a display device and a CEC device connection method applied to the display device.

Background

The high definition multimedia interface (High Definition Multimedia Interface, HDMI) is a dedicated digital interface suitable for video transmission, capable of transmitting audio signals and image signals simultaneously. HDMI has now been standardized and consumer electronics control (Consumer Electronics Control, CEC) is a complete set of single bus protocols resulting from HDMI standardization. The display device may control an external device connected to the HDMI port using a CEC signal, wherein the controlled external device is referred to as a CEC device.

After the CEC device accesses the display device through the HDMI port, the display device needs to acquire device information of the CEC device using the CEC command, and then the display device establishes a connection with the CEC device using the device information of the CEC device and the logical address of the CEC device.

However, in practical applications, the HDMI CEC standard is defined as an asynchronous command for a CEC command, so that after the display device sends the CEC command to the CEC device, the time for the CEC device to feed back the reply message to the display device is not controllable, and the display device may need to wait for a long time to acquire the device information of the CEC device, resulting in low efficiency of establishing a connection between the display device and the CEC device.

Disclosure of Invention

The application provides a display device and a CEC device connection method applied to the display device, which can improve the efficiency of establishing connection between the display device and the CEC device.

In a first aspect, some embodiments of the present application provide a display device, including:

a display;

a controller configured to:

when detecting that the HDMI port has CEC equipment access, sending an HDMI module information request to the CEC equipment;

receiving HDMI module information of the CEC equipment from the CEC equipment, wherein the HDMI module information is returned information of the CEC equipment according to the HDMI module information request;

If the equipment information of the CEC equipment is found based on the configuration file according to the HDMI module information, establishing connection with the CEC equipment according to the equipment information and a logic address, wherein the configuration file at least comprises a corresponding relation between the HDMI module information and the equipment information of external equipment, and the logic address is an address allocated to the CEC equipment by a CEC line where the display equipment is located;

if the device information of the CEC device is not found based on the configuration file according to the HDMI module information, a device information request is sent to the CEC device, the device information returned according to the device information request is received from the CEC device, and a connection is established with the CEC device according to the device information and the logic address.

In a second aspect, some embodiments of the present application provide a display device including at least a first HDMI module and a first CEC module, the first HDMI module configured to:

when detecting that the HDMI port has CEC equipment access, sending an HDMI module information request to a second HDMI module of the CEC equipment;

receiving HDMI module information returned according to the HDMI module information request from the second HDMI module;

If the device information of the CEC device is found based on the configuration file according to the HDMI module information, the device information is sent to the first CEC module, wherein the configuration file at least comprises a corresponding relation between the HDMI module information and the device information of the external device;

the first CEC module is configured to:

generating a connection request according to the device information and a logical address, and sending the connection request to the second CEC module, wherein the logical address is an address allocated to the CEC device by a CEC line where the display device is located;

and receiving a connection success message fed back by the second CEC module according to the connection request, and determining to establish connection with the CEC equipment according to the connection success message.

In a third aspect, some embodiments of the present application provide a CEC device connection method applied to a display device, including:

when detecting that the HDMI port has CEC equipment access, sending an HDMI module information request to the CEC equipment;

receiving HDMI module information of the CEC equipment from the CEC equipment, wherein the HDMI module information is returned information of the CEC equipment according to the HDMI module information request;

If the equipment information of the CEC equipment is found based on the configuration file according to the HDMI module information, establishing connection with the CEC equipment according to the equipment information and a logic address, wherein the configuration file at least comprises a corresponding relation between the HDMI module information and the equipment information of external equipment, and the logic address is an address allocated to the CEC equipment by a CEC line where the display equipment is located;

if the device information of the CEC device is not found based on the configuration file according to the HDMI module information, a device information request is sent to the CEC device, the device information returned according to the device information request is received from the CEC device, and a connection is established with the CEC device according to the device information and the logic address.

As can be seen from the above technical solutions, in the display device and the CEC device connection method applied to the display device provided in the above embodiments, when detecting that the HDMI port has CEC device access, an HDMI module information request is sent to the CEC device, and HDMI module information of the CEC device is received from the CEC device. If the device information of the CEC device is found based on the configuration file according to the HDMI module information, a connection is established with the CEC device according to the device information and the logical address of the CEC device. The configuration file at least comprises a corresponding relation between HDMI module information and device information of external devices, and the logical address is an address allocated to the CEC device by the CEC line where the display device is located. If the device information of the CEC device is not found based on the configuration file according to the HDMI module information, a device information request is sent to the CEC device, the device information returned according to the device information request is received from the CEC device, and then a connection is established with the CEC device according to the device information and the logic address. In this way, if the configuration file stores the correspondence between the HDMI module information and the device information, the device information of the CEC device can be directly obtained from the configuration file, without sending a device information request to the CEC device, so that the efficiency of establishing connection between the display device and the CEC device is improved from the viewpoint of reducing CEC instructions.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an operation scenario between a display device and a control device provided in some embodiments of the present application;

FIG. 2 is a block diagram of a hardware configuration of a display device provided in some embodiments of the present application;

FIG. 3 is a block diagram of a hardware configuration of a control device provided in some embodiments of the present application;

fig. 4 is a schematic diagram of software configuration in a display device according to some embodiments of the present application;

fig. 5 is a signaling diagram illustrating interaction between a display device 200 and a CEC device according to some embodiments of the present application;

FIG. 6 is a flowchart of logical address allocation for a CEC device provided in some embodiments of the present application;

FIG. 7 is a block diagram of the hardware connections of some functional modules of the display device 200 provided in some embodiments of the present application;

fig. 8 is a flowchart illustrating a CEC device connection method performed by the display device 200 according to some embodiments of the present application;

Fig. 9 is a schematic diagram illustrating interactions between modules in a display device 200 and modules in a CEC device according to some embodiments of the present application;

fig. 10 is a signaling diagram illustrating interactions between modules in a display device 200 and modules in a CEC device according to some embodiments of the present application;

fig. 11 is a schematic diagram of correspondence between GPIO pins and detection signals provided in some embodiments of the present application;

FIG. 12 is a schematic diagram illustrating interactions between modules in a display device 200 and modules in a CEC device according to some embodiments of the present application;

FIG. 13 is a signaling diagram illustrating interaction between modules in a display device 200 and modules in a CEC device according to some embodiments of the present application;

fig. 14 is a schematic diagram of interaction between a first HDMI module and a second HDMI module provided in some embodiments of the present application;

FIG. 15 is a signaling diagram illustrating interaction between modules in a display device 200 and modules in a CEC device according to some embodiments of the present application;

FIG. 16 is a schematic diagram of a configuration file structure provided in some embodiments of the present application;

FIG. 17 is a schematic diagram of another configuration file structure provided in some embodiments of the present application;

fig. 18 is a flowchart of a CEC device control method according to some embodiments of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of some embodiments of the present application more clear, the technical solutions of some embodiments of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application.

It should be noted that the brief description of the terms in some embodiments of the present application is only for convenience in understanding the embodiments described below, and is not intended to limit the implementation of some embodiments of the present application. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.

The terms first, second, third and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware or/and software code that is capable of performing the function associated with that element.

Fig. 1 is a schematic diagram of an operation scenario between a display device and a control device according to some embodiments of the present application. As shown in fig. 1, a user may operate the display device 200 through the mobile terminal 300 and the control device 100.

In some embodiments, the mobile terminal 300 may install a software application with the display device 200, implement connection communication through a network communication protocol, and achieve the purpose of one-to-one control operation and data communication. The audio/video content displayed on the mobile terminal 300 can also be transmitted to the display device 200, so as to realize the synchronous display function.

As also shown in fig. 1, the display device 200 is also in data communication with the server 400 via a variety of communication means. The display device 200 may be permitted to make communication connections via a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks.

The display apparatus 200 may additionally provide a smart network television function of a computer support function, including, but not limited to, a network television, a smart television, an Internet Protocol Television (IPTV), etc., in addition to the broadcast receiving television function.

Fig. 2 is a block diagram of a hardware configuration of the display device 200 of fig. 1 provided in some embodiments of the present application.

In some embodiments, display apparatus 200 includes at least one of a modem 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, memory, a power supply, a user interface.

In some embodiments, the detector 230 is used to collect signals of the external environment or interaction with the outside. For example, detector 230 includes a light receiver, a sensor for capturing the intensity of ambient light; alternatively, the detector 230 includes an image collector such as a camera, which may be used to collect external environmental scenes, user attributes, or user interaction gestures, or alternatively, the detector 230 includes a sound collector such as a microphone, or the like, which is used to receive external sounds.

In some embodiments, the display 260 includes a display screen component for presenting a picture, and a driving component for driving an image display, for receiving an image signal from the controller output, for displaying video content, image content, and components of a menu manipulation interface, and a user manipulation UI interface, etc.

In some embodiments, communicator 220 is a component for communicating with external devices or servers 400 according to various communication protocol types.

In some embodiments, the controller 250 includes a processor, a video processor, an audio processor, a graphic processor, a RAM, a ROM, first to nth interfaces for input/output, and the controller 250 controls the operation of the display device and responds to the user's operation through various software control programs stored on the memory. The controller 250 controls the overall operation of the display apparatus 200.

In some embodiments, the controller 250 and the modem 210 may be located in separate devices, i.e., the modem 210 may also be located in an external device to the main device in which the controller 250 is located, such as an external set-top box or the like.

In some embodiments, a user may input a user command through a Graphical User Interface (GUI) displayed on the display 260, and the user input interface receives the user input command through the Graphical User Interface (GUI).

In some embodiments, user interface 280 is an interface that may be used to receive control inputs.

Fig. 3 is a block diagram of a hardware configuration of the control device in fig. 1 according to some embodiments of the present application. As shown in fig. 3, the control device 100 includes a controller 110, a communication interface 130, a user input/output interface, a memory, and a power supply.

The control device 100 is configured to control the display device 200, and can receive an input operation instruction of a user, and convert the operation instruction into an instruction recognizable and responsive to the display device 200, functioning as an interaction between the user and the display device 200.

In some embodiments, the control device 100 may be a smart device. Such as: the control apparatus 100 may install various applications for controlling the display apparatus 200 according to user's needs.

In some embodiments, as shown in fig. 1, a mobile terminal 300 or other intelligent electronic device may function similarly to the control device 100 after installing an application that manipulates the display device 200.

The controller 110 includes a processor 112 and RAM 113 and ROM 114, a communication interface 130, and a communication bus. The controller 110 is used to control the operation and operation of the control device 100, as well as the communication collaboration among the internal components and the external and internal data processing functions.

The communication interface 130 enables communication of control signals and data signals with the display device 200 under the control of the controller 110. The communication interface 130 may include at least one of a WiFi chip 131, a bluetooth module 132, an NFC module 133, and other near field communication modules.

A user input/output interface 140, wherein the input interface includes at least one of a microphone 141, a touchpad 142, a sensor 143, keys 144, and other input interfaces.

In some embodiments, the control device 100 includes at least one of a communication interface 130 and an input-output interface 140. The control device 100 is provided with a communication interface 130 such as: the WiFi, bluetooth, NFC, etc. modules may send the user input instruction to the display device 200 through a WiFi protocol, or a bluetooth protocol, or an NFC protocol code.

A memory 190 for storing various operation programs, data and applications for driving and controlling the control device 100 under the control of the controller. The memory 190 may store various control signal instructions input by a user.

A power supply 180 for providing operating power support for the various elements of the control device 100 under the control of the controller.

Fig. 4 is a schematic software configuration diagram of the display device in fig. 1 provided in some embodiments of the present application, and in some embodiments, the system of the display device 200 may be divided into three layers, namely, an application layer, a middleware layer, and a hardware layer from top to bottom.

The application layer mainly comprises common applications on the television, and an application framework (Application Framework), wherein the common applications are mainly applications developed based on Browser, such as: HTML5 APPs; native applications (Native APPs);

the application framework (Application Framework) is a complete program model with all the basic functions required by standard application software, such as: file access, data exchange, and the interface for the use of these functions (toolbar, status column, menu, dialog box).

Native applications (Native APPs) may support online or offline, message pushing, or local resource access.

The middleware layer includes middleware such as various television protocols, multimedia protocols, and system components. The middleware can use basic services (functions) provided by the system software to connect various parts of the application system or different applications on the network, so that the purposes of resource sharing and function sharing can be achieved.

The hardware layer mainly comprises a HAL interface, hardware and a driver, wherein the HAL interface is a unified interface for all the television chips to be docked, and specific logic is realized by each chip. The driving mainly comprises: audio drive, display drive, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (e.g., fingerprint sensor, temperature sensor, pressure sensor, etc.), and power supply drive, etc.

For clarity of explanation of the technical solutions of the present application, firstly, explanation will be made on the terms designed in the present application:

CEC (Consumer Electronics Control), consumer electronics control, which allows an end user to control a plurality of CEC-capable HD devices using one remote control, thereby eliminating the need to use multiple remote controls to control the electronic device, such as: television (TV), set-top box and portable HD device.

EDID (Extended Display Identification Data), i.e. the extended display identification data, is a data specification designed by the video standards organization VESA for the optimized display format set by the PC display. EDID contains basic parameters of the display device, such as manufacturer, product name, maximum line frequency, supportable resolution, etc., and is data after realizing plug-and-play function. The storage mode of the EDID comprises an internal mode and an external mode. The EDID built-in mode is to write EDID data into a program, write the EDID data into an electrically erasable programmable read-Only Memory (EEPROM) chip when the intelligent television is powered on by direct current, and obtain the EDID data of the intelligent television from the EEPROM chip when the intelligent television is used. The external EDID mode is to directly write the EDID data in an external EEPROM chip, and directly read by external equipment through a display data channel without being controlled by a main program of the intelligent television.

HDMI (High Definition Multimedia Interface, HDMI), a high definition multimedia interface, is a digital video/audio interface technology, is a special digital interface suitable for video transmission, can simultaneously transmit audio and video signals, has a maximum data transmission speed of 48Gbps (version 2.1), and does not need to perform digital/analog or analog/digital conversion before signal transmission. The HDMI interface has a hot plug function.

SOC (System on Chip), a System on Chip, also known as a System on Chip, is a System or product formed by combining multiple integrated circuits with specific functions on a Chip, including a complete hardware System and embedded software carried thereby. In the embodiment of the application, the SOC detects whether the device is accessed, reads EDID information, and the like.

ARC (Audio Return Channel), i.e. sound feedback, the use of a single HDMI connection line enables the television to send audio signals upstream to a connected sound bar, single box home theater or AV receiver creating a channel of bi-directional information by forming a "handshake" between the television and audio equipment, eliminating the need for fiber optic audio cables and thus reducing the confusion of the home center line.

In some embodiments, the display device 200 may control an external device connected on the HDMI port using the CEC signal, and the controlled external device is referred to as a CEC device. After the CEC device accesses the display device 200 through the HDMI port, the display device 200 needs to acquire device information of the CEC device using the CEC instruction, and then the display device 200 establishes a connection with the CEC device using the device information of the CEC device and the logical address of the CEC device.

For example, as shown in the interactive signaling diagram of the display device 200 and the CEC device in fig. 5, since the HDMI port has a hot plug function, when the CEC device is connected to the display device 200 through the HDMI port, the display device 200 detects the connection action of the CEC device using the hot plug function. The system hardware of the display device 200 will trigger the HPD (Hot Plug Detection) signal, through which the display device 200 knows that there is CEC device access. After receiving the HPD signal, the display device 200 broadcasts its own physical address to the outside, and all CEC devices of the CEC line where the display device 200 is located can acquire the physical address broadcast by the display device 200.

After receiving the physical address broadcast by the display device 200, the CEC device calculates its own logical address (usually, the CEC line allocates an address to the CEC device) according to the HDMI standard protocol, and broadcasts the allocated logical address. Among them, CEC is a protocol based on a bus system, and physical addresses are allocated through Physical Address Discovery Process (physical address discovery mechanism). When a CEC-enabled device gets a new physical address, the following steps are performed: it is decided to apply for allocation of a logical address corresponding to the device type of the CEC device; the binding of its physical address and logical address is reported by broadcast (Report Physical Address). The type of logical address may be as shown in table 1:

Table 1 logical address type

The logical addresses of the CEC devices are also dynamically allocated, and as shown in fig. 6, the logical address allocation manner of the CEC devices may be as follows:

the root node (typically display device 200) is directly assigned logical address 0. When a CEC Device is inserted into the display Device 200, a first preset logical address is allocated to the CEC Device according to the Device type of the inserted CEC Device, for example, if the CEC Device is a DVD, the Device type is a Playback Device1, the CEC Device is allocated with the first preset logical address 4 as needed in table 1, and the first preset logical address is broadcast to other CEC devices by broadcasting. If the first preset logical address 4 is not occupied, the currently accessed CEC device does not receive the acknowledgement message.

If the first preset logical address 4 is already occupied, the CEC device occupying the first preset logical address 4 will feed back a reply acknowledge message to the currently accessed CEC device, where the reply acknowledge message is used to inform the currently accessed CEC device that the first preset logical address 4 is already occupied. After receiving the acknowledgement message, the currently accessed CEC device continues to allocate the logical address according to table 1 until no acknowledgement message fed back by other CEC devices is received after the logical address is allocated.

For example, a second preset logical address 8 is allocated to the currently accessed CEC device, after broadcasting the logical address, no acknowledgement message fed back by other CEC devices is received, and the second preset logical address 8 is not occupied, so that the currently accessed CEC device may occupy the second preset logical address 8. After the currently accessed CEC device occupies the second preset logical address 8, a broadcast "Report Physical Address (report logical address)", which includes the physical address and the logical address of the currently accessed CEC device, is transmitted for declaring the occupation of the second preset logical address 8 to other CEC devices. If the logical addresses are all occupied after one round of interrogation according to table 1, the logical address 15 in table 1 is allocated to the CEC device currently accessed.

After the display device 200 receives the logical address of the CEC device, the logical address of the CEC device is added to the list of devices in the system of the display device 200. And transmitting a first CEC instruction to the CEC device, the first CEC instruction requesting manufacturer information of the CEC device. After receiving the first CEC instruction, the CEC device feeds back the manufacturer information of the CEC device to the display device 200. The display device 200 then continues to transmit a second CEC instruction to the CEC device, the second CEC instruction requesting the device name of the CEC device. After receiving the second CEC instruction, the CEC device feeds back the device name of the CEC device to the display device 200. After acquiring the manufacturer information and the device name of the CEC device, the display device 200 may send a connection request to the CEC device, and the CEC device may establish a connection with the CEC device when feeding back a connection success message according to the connection request.

The HDMI CEC standard is defined as an asynchronous instruction for CEC instructions. When the synchronous instruction call is completed, the instruction execution is also completed. While execution of an asynchronous instruction is not necessarily complete when an asynchronous instruction call is completed, because execution of an asynchronous instruction may span multiple calls. Execution of asynchronous instructions may loop throughout the connection. Therefore, after the display device 200 transmits a CEC instruction to the CEC device, the time at which the CEC device feeds back a reply message to the display device 200 is not controllable. The display device 200 may need to wait a long time to acquire the device information fed back from the CEC device. The device information fed back by the CEC device cannot be obtained, and the display device 200 cannot establish a connection with the CEC device, which may result in low efficiency of establishing a connection between the display device and the CEC device.

In view of the above, some embodiments of the present application provide a display apparatus 200. In order to facilitate understanding of the technical solutions in some embodiments of the present application, the following details of each step are described with reference to some specific embodiments and the accompanying drawings. Fig. 7 is a block diagram of hardware connection of some functional modules of the display device 200 according to some embodiments of the present application. Fig. 8 is a flowchart illustrating a CEC device connection method performed by the display device 200 according to some embodiments of the present application.

As shown in fig. 7, the functional modules of the display device 200 according to the embodiment of the present application mainly include: a controller 250, a power supply, a display 260, an HDMI module, and a CEC module. The above-mentioned functional modules are merely modules described for illustration, and are not intended to implement all of the functional modules of the present application.

The controller 250 is a control and signal processing core of the whole display device 200, and is responsible for controlling the system operation of the whole display device 200, including receiving external image signals, decoding the image signals, processing the image quality, outputting the image signals, controlling the backlight assembly to operate, and ensuring the normal operation of peripheral devices or devices such as Wi-Fi and bluetooth.

The power supply is a power output module of the entire display apparatus 200, and provides power guarantee to all modules of the display apparatus 200. The display 260 is used to display video pictures. In this embodiment, the HDMI module of the display device 200 is referred to as a first HDMI module, and the CEC module of the display device 200 is referred to as a first CEC module. The CEC device connected to the display device 200 also includes an HDMI module and a CEC module, the HDMI module of the CEC device being denoted as a second HDMI module, the CEC module of the CEC device being denoted as a second CEC module.

Typically the HDMI module and the CEC module on the device are separate modules, i.e. there is typically no interaction between the first HDMI module and the first CEC module on the display device 200, but rather interaction with the corresponding modules on the CEC device, respectively. That is, the first HDMI module interacts with the second HDMI module, and the first CEC module interacts with the second CEC module. As shown in the module interaction schematic diagram of fig. 9 and the module interaction signaling diagram of fig. 10, if there is no interaction between the first HDMI module and the first CEC module, the process of establishing connection between the display device 200 and the CEC device may be:

when the CEC device accesses the display device 200, the system hardware triggers the HPD signal and transmits the HPD signal to the first HDMI module and the first CEC module. After receiving the HPD signal, the first CEC module broadcasts its physical address to the outside. After receiving the physical address of the display device 200, the second CEC module allocates the logical address according to the above-mentioned process of allocating the logical address, and then broadcasts the allocated logical address to the display device 200 and other CEC devices. The first CEC module, after receiving the logical address of the CEC device, transmits a first CEC instruction for requesting manufacturer information of the device to the second CEC module. The second CEC module returns manufacturer information of the device to the first CEC module. The first CEC module then sends a second CEC instruction to the second CEC module requesting the device name of the device. The second CEC module returns the device name of the device to the first CEC module. After the first CEC module receives various information of the device, it transmits a connection request to the second CEC module. And the second CEC module returns a connection success message to the first CEC module according to the connection request, namely, the connection process of the display device 200 and the CEC device is completed.

It should be noted that, the connection between the display device 200 and the CEC device may be a normal CEC connection or an ARC connection, and if an ARC connection needs to be established between the display device 200 and the CEC device, the CEC device needs to access an HDMI port supporting ARC, that is, an HDMI ARC channel is established, and the SOC may output sound through the HDMI ARC channel. The audio and video data are input into the SOC through the HDMI original channel, video images and audio are separated through SOC decoding, wherein the video images can be output through the display screen, and the audio is output to the power amplifier through the HDMI ARC channel. The difference between the HDMI port with the ARC function and the HDMI port without the ARC function is: the HDMI port with ARC function has one ARC sound transmission connected to the main chip.

Based on the functional modules shown in fig. 7, as shown in fig. 8, the CEC device connection method performed by the display device 200 provided in the embodiment of the present application includes the following steps:

step S100: and when detecting that the HDMI port has CEC equipment access, sending an HDMI module information request to the CEC equipment.

Step S200: and receiving HDMI module information of the CEC equipment from the CEC equipment, wherein the HDMI module information is returned information of the CEC equipment according to the HDMI module information request.

The manner of detecting whether the HDMI port has CEC device access may be to detect whether the HDMI cable has an insertion and whether the HDP level changes, and specifically, the HDMI circuit may use an EEPROM to store EDID, and use two GPIOs (General-purpose i/O ports, programmable input/output interfaces) to perform HDMI cable detection and Hot Plug Detection (HPD), respectively, to control the HDMI system.

When a transmitting end (CEC device) of the HDMI system accesses a receiving end (display device 200), the display device 200 responds to a hot plug detection signal to the CEC device, and the CEC device starts a DDC (Display Data Channel ) channel to read EDID information of the display device 200, and then performs HDCP (High-bandwidth Digital Content Protection, high bandwidth digital content protection technology) interaction.

In addition, the external EEPROM can be replaced by the EDID built in the SOC. When EDID is built in, the display device 200 may complete HDMI control using two GPIO pins (GPIO 1 and GPIO2 as shown in fig. 11). The GPIO1 is used for detecting whether the HDMI cable is inserted or not, and the GPIO2 is used for controlling the hot plug detection output level. When the CEC device is accessed through the HDMI cable, the display device 200 detects that the GPIO1 has a high level signal input, and then the display device 200 outputs a low level hot plug detection signal of at least 100 ms duration to the CEC device through GPIO2 control. The display device 200 then controls the GPIO2 to go high. When the level change of the hot plug signal is detected, the CEC device access of the HDMI port is detected.

Because of the problem of long recovery time of the CEC command, the CEC device is connected by using the way that the first CEC module and the second CEC module interact CEC commands, which easily results in low connection efficiency of the CEC device. Therefore, the present application can utilize the first HDMI module to interact with the first CEC module, and reduce CEC commands by acquiring device information of the CEC device in the display device 200, thereby improving CEC device connection efficiency.

The further module interaction schematic diagram shown in fig. 12 and the further module interaction signaling diagram shown in fig. 13, when detecting that the HDMI port has CEC device access, the first HDMI module sends an HDMI module information request to the second HDMI module. And after receiving the HDMI module information request, the second HDMI module of the CEC device returns the HDMI module information of the CEC device to the first HDMI module according to the HDMI module information request.

As shown in fig. 14, the schematic diagram of interaction between the first HDMI module and the second HDMI module, where the solid line is a data signal line, the dotted line is a control signal line, and the first HDMI module may include an HDMI receiving and decoding chip and an EDID memory. The second HDMI module may include an HDMI output chip and an EDID memory. The HDMI output chip outputs digital audio and video signals, and the digital audio and video signals are transmitted to the HDMI decoding chip of the first HDMI module through the HDMI port by the HDMI line. The EDID memory of the second HDMI module stores EDID information of the CEC device.

The digital audio and video signals input through the HDMI port can enter the HDMI receiving and decoding chip in the form of 4 pairs of minimized transmission differential signals TMDS, and the EDID information is read through the EDID memory. The EDID information of the display device 200 may contain parameters related to the display and its capabilities, including vendor information, maximum image size, color settings, vendor presets, limitations of frequency ranges, and strings of display names and serial numbers. The video signal contacted with the HDMI decoding chip is sent to a video processor for output and display; the audio signal is restored into a stereo audio signal through the audio processor and sent to the loudspeaker for sound playing.

In this embodiment, the first HDMI module obtains the EDID information of the CEC device from the EDID memory of the second HDMI module, that is, the HDMI module information returned by the CEC device to the display device 200 is the EDID information. It should be noted that the HDMI module information is EDID information, which is only an example of marking the second HDMI module, and other manners may be used to mark the second HDMI module, for example, mark the second HDMI module with HDCP information.

Step S300: if the device information of the CEC device is found based on the configuration file according to the HDMI module information, connection is established with the CEC device according to the device information and a logic address, wherein the configuration file at least comprises a corresponding relation between the HDMI module information and the device information of the external device, and the logic address is an address dynamically allocated to the CEC device by a CEC line where the display device is located.

Step S400: if the device information of the CEC device is not found from the configuration file according to the HDMI module information, a device information request is sent to the CEC device, the device information returned according to the device information request is received from the CEC device, and a connection is established with the CEC device according to the device information and the logic address.

In this embodiment of the present application, the configuration file may be stored in the first HDMI module, or may be stored in another memory of the display device 200, or may be stored in a plug-in device, for example, in a server accessible to the display device 200. The configuration file may include a correspondence between HDMI module information and device information, or may include specific device information; the configuration file may include only the correspondence between the HDMI module information and the device information, and not include specific device information. The specific device information may be stored in other memories, and after the corresponding relationship between the HDMI module information and the device information is found from the configuration file, the corresponding specific device information is obtained from other memories or servers according to the found corresponding relationship.

In some embodiments, a plurality of configuration files may be stored in the first HDMI module, and if a correspondence associated with HDMI module information is not found in one configuration file, the correspondence associated with HDMI module information may be continuously found in the other configuration files. Here, the correspondence relation associated with the HDMI module information may be marked with the HDMI module information.

In addition, the priority ranking can be performed on the configuration files, that is, when the corresponding relation associated with the HDMI module information is searched, the configuration files with the highest priority are searched first, if the corresponding relation associated with the HDMI module information is not searched in the configuration files with the highest priority, the configuration files with the second highest priority are continuously searched, and the like until the corresponding relation associated with the HDMI module information is searched. In this case, the priority of the profile may be determined according to the frequency of use corresponding to the CEC device, wherein the profile corresponding to the CEC device having a higher frequency of use is generally set to a higher priority.

For example, the first HDMI module includes a configuration file 1, a configuration file 2, and a configuration file 3, …, where the configuration file 1 stores a correspondence between HDMI module information and device information of five devices with highest frequency of use, the frequency of use of the related device stored in the configuration file 2 is lower than the frequency of use of the related device stored in the configuration file 1, and the frequency of use of the related device stored in the configuration file 3 is lower than the frequency of use … of the related device stored in the configuration file 2. Thus, the search priority order of the profiles is profile 1, profile 2, profile 3 …, profile N.

After the CEC device is connected to the display device 200, the corresponding relationship between the HDMI module information and the device information is first searched from the configuration file 1, and since the CEC device corresponding to the information stored in the configuration file 1 has the highest use frequency, for the CEC device that is more commonly used by the user, the device information can be quickly searched from the configuration file 1, thereby further improving the connection efficiency. And different corresponding relations are divided into different configuration files, so that the efficiency of searching the equipment information can be improved in the process of searching the corresponding relations. For example, the frequency of the sound box and the DVD is highest, the corresponding relation between the sound box and the DVD is stored in the configuration file 1, the priority level of the configuration file 1 is highest, and the sound box and the DVD can be more quickly searched from the configuration file 1 during searching, so that the connection efficiency is improved.

The correspondence may be integrated on the first HDMI module in the form of a plug-in, so that if a new correspondence needs to be added to the configuration file, the first HDMI module may be directly written in the form of a plug-in. And after the configuration file is modified, the modified configuration file is rewritten into the first HDMI module in the form of a plug-in.

As shown in the interaction diagram of fig. 13, the configuration file is stored in the first HDMI module, and if the device information corresponding to the HDMI module information is found in the configuration file, the first HDMI module may send the found device information to the first CEC module.

The device information to be found needs to include device manufacturer information and device names corresponding to CEC devices. If the found device information includes only the device manufacturer information or only the device name, the device information indicating the CEC device for establishing connection stored in the first HDMI block is incomplete. If the found device information is incomplete, the display device 200 still cannot transmit a connection request to the CEC device. In this case, the first CEC module still needs to transmit a CEC instruction for acquiring the device information of the CEC device to the second CEC module. The connection procedure between the first CEC module and the second CEC module is then enabled.

If the device information found in the first HDMI block includes device manufacturer information and a device name, the device information indicating the CEC device for establishing connection stored in the first HDMI block is complete. After receiving the found device information, the first CEC module may directly send a connection request to the second CEC module, and after receiving the connection request, the second CEC module feeds back a connection success message to the first CEC module, thereby completing connection between the display device 200 and the CEC device. In addition, the connection procedure still requires the first CEC module to broadcast its physical address to the outside after receiving the HPD signal. After receiving the physical address of the display device 200, the second CEC module allocates the logical address according to the above-mentioned process of allocating the logical address, and then broadcasts the allocated logical address to the display device 200 and other CEC devices. The first CEC module needs to send a connection request to the second CEC module according to the device information and the logical address.

As shown in the interaction diagram of fig. 15, the configuration file is stored in the first HDMI module, and if device information corresponding to the HDMI module information is not found in the configuration file, the first HDMI module may send a device information unobtainment message to the first CEC module. The first CEC module, after receiving the device information non-acquisition message, transmits a first CEC instruction for requesting manufacturer information of the device to the second CEC module. The second CEC module returns manufacturer information of the device to the first CEC module. The first CEC module then sends a second CEC instruction to the second CEC module requesting the device name of the device. The second CEC module returns the device name of the device to the first CEC module. After the first CEC module receives various information of the device, it transmits a connection request to the second CEC module. And the second CEC module returns a connection success message to the first CEC module according to the connection request, namely, the connection process of the display device 200 and the CEC device is completed.

In addition, the connection procedure still requires the first CEC module to broadcast its physical address to the outside after receiving the HPD signal. After receiving the physical address of the display device 200, the second CEC module allocates the logical address according to the above-mentioned process of allocating the logical address, and then broadcasts the allocated logical address to the display device 200 and other CEC devices. The first CEC module needs to send a connection request to the second CEC module according to the device information and the logical address.

As can be seen from the above technical solutions, in the CEC device connection method provided in the present application, when detecting that the HDMI port of the display device 200 has CEC device access, an HDMI module information request is sent to the CEC device, and HDMI module information of the CEC device is received from the CEC device. If the device information of the CEC device is found based on the configuration file according to the HDMI module information, connection is established with the CEC device according to the device information and the logic address of the CEC device. The configuration file at least comprises a corresponding relation between HDMI module information and device information of external devices. If the device information of the CEC device is not found based on the configuration file according to the HDMI module information, a device information request is sent to the CEC device, the device information returned according to the device information request is received from the CEC device, and then a connection is established with the CEC device according to the device information and the logic address.

Typically, the HDMI connection and the CEC connection on the display device 200 are separate modules, i.e., the first HDMI module and the first CEC module do not interact, so that when device information is acquired, the CEC module of the display device 200 interacts with the CEC module on the CEC device to establish a connection with the CEC device of the display device 200 after the device information of the CEC device is acquired. However, CEC command interactions between different devices have a reply latency, which results in a lower efficiency of establishing a connection between the display device 200 and the CEC device. The present application utilizes module interaction inside the display device 200, that is, device information of CEC devices is stored in a first HDMI module, and the first HDMI module interacts with the first CEC module to obtain the device information of CEC devices. Thus, the device information of the CEC device can be obtained without depending on CEC instructions, and the efficiency of establishing connection between the display device 200 and the CEC device can be improved from the viewpoint of reducing CEC instructions.

In some embodiments, if the device information of the CEC device is not found based on the configuration file according to the HDMI module information, the first CEC module may send a CEC instruction to the second CEC module to acquire the device information of the CEC device. After receiving the returned device information according to the device information request from the CEC device, the returned device information and the HDMI module information may be bound and a new correspondence may be established, and the created new correspondence may be stored in the configuration file stored in the first HDMI module. Thus, the corresponding relation between the HDMI module information and the equipment information exists in the first HDMI module. If the current CEC device is pulled out from the display device 200 and then the display device 200 is connected again, the device information of the current CEC device can be found from the configuration file, thereby improving the connection efficiency of different CEC devices.

For example, as shown in fig. 16, the correspondence relationship A, CEC of the HDMI module information B and { device information B } of the device B, the HDMI module information C and { device information C } of the CEC device C, which include the HDMI module information a and { device information a } of the CEC device a (the device information may be a set of some information including at least the device manufacturer information and the device name) in the first HDMI module. If the accessed CEC device is CEC device a, the first HDMI module may acquire HDMI module information a from the second HDMI module, and then find a correspondence a from the configuration file according to the HDMI module information a, and find { device information a } according to the correspondence a.

If the accessed CEC device is CEC device D, after the first HDMI module obtains HDMI module information D from the second HDMI module, the corresponding relation cannot be found from the configuration file according to the HDMI module information D, and therefore device information of the CEC device D cannot be found. At this time, the first HDMI module may transmit a device information non-acquisition message to the first CEC module, which acquires { device information D } from the second CEC module using a CEC instruction. After the first CEC module acquires { device information D }, the { device information D } may be transmitted to the first HDMI module.

The first HDMI block, after receiving { device information D }, establishes a correspondence relationship D between { device information D } and HDMI block information D. Then, the correspondence relationship D is stored in the configuration file shown in fig. 16, and the configuration file shown in fig. 17 can be obtained. Based on the configuration file shown in fig. 17, if the CEC device D is pulled out from the display device 200 and then is connected to the display device 200 again, the corresponding relationship D may be found from the configuration file according to the HDMI module information D, and { device information D } may be found according to the corresponding relationship D, without obtaining { device information D } based on the CEC command between the first CEC module and the second CEC module.

In some embodiments, if the device information of the CEC device is not found based on the configuration file according to the HDMI module information, then the condition of transmitting the device information request to the CEC device further includes: there is no associated HDMI module information having an association with the HDMI module information. If associated HDMI module information having an association relationship with the HDMI module information exists, and associated device information can be found based on the configuration file according to the associated HDMI module information, the associated device information is also associated with the device information of the CEC device. The display device 200 can establish a connection with the CEC device according to the associated device information and the logical address.

For example, the display device 200 accesses the CEC device E, and then based on the configuration file shown in fig. 17, cannot find the correspondence E of the HDMI module information E from the configuration file, that is, cannot find { device information E } of the CEC device. At this time, the HDMI module information having an association relationship with the HDMI module information E may be found in the first HDMI module. For example, HDMI module information a has an association relationship with HDMI module information E. The association relationship may be that the format of the HDMI module information is the same or that some fields are the same.

The HDMI module information of CEC device E is "XXXABCDXXXEF", the HDMI module information of CEC device a is "yyyyabcdyyyef", the "ABCD" field in the HDMI module information of CEC device E is identical to the "ABCD" field in the HDMI module information of CEC device a, and the "EF" field in the HDMI module information of CEC device E is identical to the "EF" field in the HDMI module information of CEC device a. The "ABCD" field may indicate a device manufacturer, the "EF" field may indicate a device type, when the "ABCD" field is the same, indicates that two CEC devices are the same manufacturer, and may share device manufacturer information, and when the "EF" field is the same, indicates that two CEC devices are the same device type, and the corresponding device names are the same. Therefore, the HDMI module information of the CEC device a has an association relationship with the HDMI module information of the CEC device E, and if the device information of the CEC device E cannot be obtained, the device information of the CEC device a may be obtained according to the association relationship between the HDMI module information and used as the device information of the CEC device E.

In some embodiments, the HDMI module information may also have the effect of marking the operations supported by the CEC device. After receiving the control instruction input by the user, the display device 200 may determine whether the CEC device user corresponding to the control instruction supports the operation corresponding to the control instruction according to the HDMI module information.

As shown in the flowchart of fig. 18, the above control process includes the steps of: step S201, after the display device 200 establishes a connection with the CEC device, the display device 200 receives a control instruction input by a user, where the control instruction is used to instruct the CEC device to perform a corresponding operation; step S202, if the operation corresponding to the control instruction is the operation supported by the HDMI module information, the display device 200 may send the control instruction to the CEC device in response to the control instruction, and after receiving the control instruction, the CEC device executes the corresponding operation according to the control instruction; in step S203, if the operation corresponding to the control instruction is not an operation supported by the HDMI module information, the display device 200 does not respond to the control instruction.

For example, the operation corresponding to the control instruction input by the user is "volume up", and if the currently accessed CEC device does not have a sound box function, the corresponding HDMI module information does not include information related to the volume operation. Thus, it may be determined that "increasing the volume" is an operation that is not supported by the current HDMI module information, at which time the display device 200 may not respond to the control instruction, and a prompt message "the current device does not support an operation of increasing the volume" may be presented on the display 260. If the currently accessed CEC device has a sound box function, the corresponding HDMI module information comprises information related to volume operation. Thus, it is possible to determine that "volume up" is an operation supported by the current HDMI module information, at which time the display device 200 may respond to the control instruction and transmit the control instruction to the CEC device. After receiving the control instruction, the CEC device performs the operation of "increasing the volume".

In the same CEC line, CECs of all CEC devices are equivalent to being suspended on the same line. Accordingly, after issuing a CEC instruction, all CEC devices in the line are able to receive the CEC instruction by the CEC of the display device 200. It is necessary to distinguish which CEC device the CEC instruction is addressed to, based on the logical address. The logical address is present in the header data of the CEC instruction. If the header data of the CEC instruction includes a logical address that matches the logical address, the corresponding CEC device performs a corresponding execution action on the operation code in the CEC instruction. If the header data of the CEC instruction includes a logical address that does not match its logical address, the corresponding CEC device ignores the CEC instruction.

For example, the CEC instruction is a Standby instruction whose content is "start signal +00ff+0x36", in which: 00 denotes a logical address of the display device 200, FF denotes a broadcast address (i.e., a logical address set of all CEC devices), and 0x36 denotes a standby operation. This instruction is a CEC instruction that the display device 200 transmits to all CEC devices, and indicates that the display device 200 notifies all CEC devices to enter a standby state. The CEC devices on the same CEC line as the display device 200 enter a standby state upon receiving the instruction.

In some embodiments, the condition that the display device 200 transmits the HDMI module information request to the CEC device further includes: and if the HDMI port accessed by the CEC device is not the preset HDMI port, the HDMI module information request is not sent to the CEC device. In this way, certain HDMI ports can be limited to be connected with CEC equipment by adopting the method, and other ports can be connected by adopting other methods, so that the applicability of the equipment is improved.

The same and similar parts of the embodiments in this specification are referred to each other, and are not described herein.

It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied essentially or in parts contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the embodiments or parts of the embodiments of the present invention.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. A display device, characterized by comprising:

a display;

a controller configured to:

When detecting that the HDMI port has CEC equipment access, sending an HDMI module information request to the CEC equipment;

receiving HDMI module information of the CEC equipment from the CEC equipment, wherein the HDMI module information is returned information of the CEC equipment according to the HDMI module information request;

if the equipment information of the CEC equipment is found based on the configuration file according to the HDMI module information, establishing connection with the CEC equipment according to the equipment information and a logic address, wherein the configuration file at least comprises a corresponding relation between the HDMI module information and the equipment information of external equipment, and the logic address is an address allocated to the CEC equipment by a CEC line where the display equipment is located;

if the device information of the CEC device is not found based on the configuration file according to the HDMI module information, a device information request is sent to the CEC device, the device information returned according to the device information request is received from the CEC device, and a connection is established with the CEC device according to the device information and the logic address.

2. The display device of claim 1, wherein after receiving the device information returned according to the device information request from the CEC device, the controller is further configured to:

Binding the returned equipment information and the HDMI module information, establishing a new corresponding relation, and storing the created new corresponding relation in the configuration file, so that when the CEC equipment needs to be connected again, the equipment information is searched according to the HDMI module information based on the configuration file.

3. The display device according to claim 1, wherein the condition of transmitting the device information request to the CEC device further includes: associated HDMI module information which does not exist in the HDMI module information and has an association relationship;

if the associated HDMI module information exists, and associated device information is found based on a configuration file according to the associated HDMI module information, the controller is further configured to:

and establishing connection with the CEC device according to the associated device information and the logical address.

4. The display device of claim 1, wherein after establishing a connection with the CEC device, the controller is further configured to:

receiving a control instruction input by a user, wherein the control instruction instructs the CEC device to execute a corresponding operation;

and if the operation corresponding to the control instruction is the operation supported by the HDMI module information, responding to the control instruction, and sending the control instruction to the CEC equipment so that the CEC equipment executes the corresponding operation according to the control instruction.

5. The display device of claim 4, wherein the controller is further configured to:

and if the operation corresponding to the control instruction is not the operation supported by the HDMI module information, not responding to the control instruction.

6. The display device according to claim 1, wherein the condition of transmitting the HDMI module information request to the CEC device further includes: the HDMI port accessed by the CEC device is a preset HDMI port.

7. The display device of claim 1, wherein the controller performs the assignment of the logical address configured to: when the HDMI port is detected to be accessed by the CEC device, a first preset logic address is allocated to the CEC device, and the first preset logic address is broadcasted to other CEC devices in the CEC line;

if receiving a response confirmation message fed back by other CEC equipment aiming at the first preset logic address, re-distributing a second preset logic address to the CEC equipment, wherein the response confirmation message indicates that the preset logic address is occupied;

broadcasting the second preset logic address to other CEC devices in the CEC line, and if no response confirmation message fed back by the other CEC devices for the second preset logic address is received, confirming the second preset logic address as the logic address used by the CEC device.

8. A display device, the display device comprising at least a first HDMI module and a first CEC module, the first HDMI module configured to:

when detecting that the HDMI port has CEC equipment access, sending an HDMI module information request to a second HDMI module of the CEC equipment;

receiving HDMI module information returned according to the HDMI module information request from the second HDMI module;

if the device information of the CEC device is found based on the configuration file according to the HDMI module information, the device information is sent to the first CEC module, wherein the configuration file at least comprises a corresponding relation between the HDMI module information and the device information of the external device;

the first CEC module is configured to:

generating a connection request according to the device information and a logical address, and sending the connection request to the second CEC module, wherein the logical address is an address allocated to the CEC device by a CEC line where the display device is located;

and receiving a connection success message fed back by the second CEC module according to the connection request, and determining to establish connection with the CEC equipment according to the connection success message.

9. The display device of claim 8, wherein the first HDMI module is further configured to:

if the equipment information of the CEC equipment is not found based on the configuration file according to the HDMI module information, sending an equipment information request to the first CEC module;

the first CEC module is configured to:

receiving the device information request and transmitting the device information request to the second CEC module;

receiving the equipment information fed back by the second CEC module according to the equipment information request;

generating a connection request according to the equipment information and the logical address, and sending the connection request to the second CEC module;

and receiving a connection success message fed back by the second CEC module according to the connection request, and determining to establish connection with the CEC equipment according to the connection success message.

10. A CEC device connection method applied to a display device, comprising:

when detecting that the HDMI port has CEC equipment access, sending an HDMI module information request to the CEC equipment;

receiving HDMI module information of the CEC equipment from the CEC equipment, wherein the HDMI module information is returned information of the CEC equipment according to the HDMI module information request;

If the equipment information of the CEC equipment is found based on the configuration file according to the HDMI module information, establishing connection with the CEC equipment according to the equipment information and a logic address, wherein the configuration file at least comprises a corresponding relation between the HDMI module information and the equipment information of external equipment, and the logic address is an address allocated to the CEC equipment by a CEC line where the display equipment is located;

if the device information of the CEC device is not found based on the configuration file according to the HDMI module information, a device information request is sent to the CEC device, the device information returned according to the device information request is received from the CEC device, and a connection is established with the CEC device according to the device information and the logic address.