CN112073659B - HDMI (high-definition multimedia interface) control method and device and display equipment - Google Patents

HDMI (high-definition multimedia interface) control method and device and display equipment Download PDF

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Publication number
CN112073659B
CN112073659B CN202010934123.8A CN202010934123A CN112073659B CN 112073659 B CN112073659 B CN 112073659B CN 202010934123 A CN202010934123 A CN 202010934123A CN 112073659 B CN112073659 B CN 112073659B
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hdmi
signal source
equipment
type
tmds
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CN112073659A (en
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孙学斌
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
    • H04N21/43632—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wired protocol, e.g. IEEE 1394
    • H04N21/43635—HDMI
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The invention provides an HDMI interface control method, an HDMI interface control device and display equipment, wherein the method comprises the following steps: if the HDMI of the signal source device is detected to be accessed by the signal source device, whether the device type of the signal source device is a non-standard device type is judged, wherein the non-standard device type is that the HDMI of the signal source device is a non-standard Transition Minimized Differential Signaling (TMDS) interface type, and if the device type of the signal source device is judged to be the non-standard device type, the EDID information switching function of the extended display is closed. After the display equipment is connected with the signal source equipment of the non-standard equipment type, the display equipment is controlled to prohibit the EDID information from being switched, so that the display equipment and the signal source equipment transmit audio data and video data according to the specification defined by the conventional EDID information, and the normal display function of the display equipment is ensured.

Description

HDMI (high-definition multimedia interface) control method and device and display equipment
Technical Field
The invention relates to the technical field of computers, in particular to an HDMI (high-definition multimedia interface) control method and device and display equipment.
Background
Current Display devices such as a monitor and a television have HDMI (High Definition Multimedia Interface) interfaces, and each HDMI Interface generally stores EDID (Extended Display Identification Data) information. Among them, the EDID information may be stored in a program of the display device. Accordingly, a signal source device, such as a DVD player, accesses a display device through an HDMI interface, reads EDID information stored in the display device through a DDC (Direct Digital Control) channel of the HDMI interface, parses audio information according to formats such as an image resolution, a sound format, and a sound channel supported by the display device defined in the EDID information to output a TMDS (Transition-minimized Differential Signaling), and displays the TMDS signal after the display device identifies the TMDS signal through the TMDS channel of the HDMI interface.
Specifically, the HDMI 1.4 corresponds to the EDID1.0 version, and the display mode of the corresponding display device supports a common mode; the HDMI 2.0 corresponds to the E-EDID version, the display mode of the corresponding display device supports the enhanced mode, and a user can select the display mode of the display device through a user interface of the display device to switch the version of the EDID stored in the display device. And when the display equipment receives the display mode of the display equipment selected by the user, changing the EDID information version according to the selected display mode.
However, when the standard HDMI interface of the display device is connected to the non-standard HDMI signal source device, if the user selects to switch the display mode of the display device, the accuracy of the TMDS signal recognition by the display device will be affected, and the display device will be abnormally displayed.
Disclosure of Invention
The invention aims to provide an HDMI (high-definition multimedia interface) control method, an HDMI control device and display equipment, wherein when the display equipment is connected to a signal source device of a non-standard HDMI, the display mode switching function of the display equipment is turned off, so that the accuracy of TMDS signal identification of the display equipment is ensured.
In a first aspect, the present invention provides an HDMI interface control method, applied to a display device, including:
if the HDMI of the high-definition multimedia interface is detected to have signal source equipment access, judging whether the equipment type of the signal source equipment is a nonstandard equipment type, wherein the nonstandard equipment type is the TMDS type of the signal source equipment, and the HDMI of the signal source equipment is a nonstandard minimized transmission differential signal (TMDS) interface type;
and if the equipment type of the signal source equipment is judged to be a non-standard equipment type, closing the EDID information switching function of the extended display identification data.
In a possible implementation manner, the determining whether the device type of the signal source device is a non-standard device type includes:
generating a first control instruction, disconnecting a pull-up access switch of a TMDS signal channel of the HDMI according to the first control instruction, and setting a hot plug detection pin of the HDMI to a low level;
if the voltage of the HDMI TMDS signal channel is detected to be larger than a preset voltage threshold, judging that the equipment type of the signal source equipment is a non-standard equipment type;
and if the voltage of the HDMI TMDS signal channel is detected to be smaller than or equal to a preset voltage threshold, determining that the equipment type of the signal source equipment is a standard equipment type.
In a possible implementation manner, after the turning off the extended display identification data EDID information switching function, the method further includes:
generating a second control instruction, and controlling a pull-up access switch of a TMDS signal channel of the HDMI to be closed according to the second control instruction so as to recover the pull-up voltage of the HDMI TMDS signal channel;
and setting the hot plug detection pin of the HDMI to be at a high level according to the second control instruction.
In a possible implementation manner, the determining whether the device type of the signal source device is a non-standard device type includes:
acquiring an information frame in the interface transmission data of the signal source equipment, and acquiring equipment type information of the signal source equipment according to the information frame;
and if the equipment type information of the signal source equipment is found in a preset non-standard equipment type information table, determining that the equipment type of the signal source equipment is a non-standard equipment type, and otherwise, judging that the equipment type of the signal source equipment is a standard equipment type.
In a possible implementation manner, the preset non-standard device type table is a non-standard device type information table corresponding to a non-standard HDMI interface acquired and updated through a network.
In a possible implementation manner, the turning off the extended display identification data EDID information switching function includes:
and canceling the display of the control for selecting the EDID information switching command on the user interface.
In a second aspect, the present invention provides an HDMI interface control apparatus comprising:
the generating module is used for judging whether the equipment type of the signal source equipment is a nonstandard equipment type or not if the signal source equipment is detected to be accessed into the high-definition multimedia interface HDMI;
and the closing module is used for closing the EDID information switching function of the extended display if the equipment type of the signal source equipment is judged to be the non-standard equipment type.
In a possible implementation manner, the shutdown module is specifically configured to cancel displaying a control for selecting the EDID information switching command on the user interface.
In a third aspect, the present invention provides a display device comprising: at least one processor, a memory, the memory storing computer-executable instructions;
the at least one processor executes computer-executable instructions stored by the memory, causing the at least one processor to perform the HDMI interface control method of any one of the first aspect and the first aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the HDMI interface control method according to any one of the first aspect and the first aspect is implemented.
According to the HDMI control method, the HDMI control device and the display device provided by the embodiment of the invention, after the display device is connected with the signal source device of the non-standard TMDS interface, the display device is controlled to prohibit the EDID information from being switched, so that the display device and the signal source device transmit audio data and video data according to the specification defined by the conventional EDID information, and the normal display function of the display device is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic topology diagram of a standard TMDS interface;
fig. 2 is a first flowchart of an HDMI interface control method according to an embodiment of the present invention;
fig. 3 is a flowchart of a HDMI interface control method according to an embodiment of the present invention;
fig. 4 is a flow chart of a HDMI interface control method provided in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of an HDMI interface control apparatus according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a hardware structure of a display device according to an embodiment of the present invention.
Detailed Description
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
The signal source equipment is accessed to the display equipment through the HDMI interface. The most common HDMI connector has a total of 19 pins. Wherein, each definition in 19pin is shown in table 1:
TABLE 1
Pin Definition of Pin
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2–
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1–
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0–
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock–
13 CEC
14 Reserved(N.C.on device)
15 SCL
16 SDA
17 DDC/CEC Ground
18 +5V Power
19 Hot Plug Detect
1pin to 9pin: for providing TMDS data transmission channels. The 10pin to 12pin are clock control signal transmission channels for TMDS data transmission. I.e., the HDMI transmission consists of three sets of TMDS channels and one set of TMDS clock channels. The signal source equipment and the display equipment transmit audio, video and various auxiliary data through TMDS signal channels. The HDMI encodes video signals into five signals of R, G, B, H, and V using TMDS technology. TMDS transmits three primary colors of R, G and B, HV codes are transmitted in a B signal channel, and redundant positions of R and G are used for transmitting audio signals.
13pin: and the CEC control channel is used for realizing the extended functions.
15pin to 16pin: for providing a DDC data transmission channel. And 17pin is a grounding pin of the DDC data transmission channel. The signal source equipment acquires EDID information of the display equipment through the DDC data transmission channel in a one-way mode, and the DDC data transmission channel is mainly used for exchanging EDID data and HDCP keys between the HDMI signal source end equipment and the receiving end equipment. Through EDID communication, the signal source end equipment can know the audio and video receiving capacity of the receiving end equipment; through the communication of the HDCP Key, the content protection authentication of the data stream can be carried out in real time, thereby achieving the purpose of data content protection.
18pin: for providing an HDMI interface 5v AC pin.
19pin: HPD hot plug pin. A high HPD signal level indicates that the sink device is ready, allowing the source device to access the sink device. If the 18 th pin of the HDMI sink socket is at a low level, it indicates that the HDMI source device is not ready, and at this time, the sink device should set the HPD signal to a low level; if the 18 th pin of the HDMI sink socket is at a high level, indicating that the HDMI source device is ready, the sink device may selectively set the HPD signal at the high level according to the condition of the sink device itself, so as to notify the HDMI source device, indicating that the sink device is also ready for transmission of the HDMI interface.
FIG. 1 is a schematic diagram of a standard TMDS interface topology. As shown in fig. 1, a pull-up voltage AVcc is set in a signal receiving end of TMDS data transmission. An important characteristic of the TMDS interface form is that the signal receiving end supplies voltage, and if the data transmitting end does not establish connection with the signal receiving end, the level on the TMDS channel is 0, and the TMDS channel cannot transmit signals. On the basis of the pin function provided by the existing HDMI, when the signal source device establishes data communication with the display device through the standard HDMI, the process that the display device modifies the EDID information according to the display mode switching instruction of the user is as follows:
1. pulling down the HPD, informing the signal source equipment to perform the initialization process of the sending interface again, and removing the pull-up voltage on the TMDS channel of the display equipment, wherein the level on the TMDS channel is 0V at the moment;
2. after the switching is completed and the HDMI interface of the display device is prepared, the HPD is pulled up and the pull-up voltage on the TMDS channel is increased;
3. the signal source equipment outputs a TMDS signal after receiving the HPD signal, starts reading the EDID and outputs the TMDS signal according to the EDID and the signal of the signal source equipment;
4. and the display equipment acquires the TMDS signal and displays the TMDS signal after successful identification.
However, if the signal source device provides the non-standard TMDS interface, after the HDMI interface is established between the display device and the signal source device of the non-standard TMDS interface, when the display mode of the display device is switched, the TMDS signal acquired by the display device is abnormal. For example, when the signal source device provides a CML (differential-mode logic) interface, since a pull-up voltage is set in the CML interface of the signal source, in step 1, after the pull-up voltage on the TMDS channel of the display device is removed, the level on the TMDS channel is not 0v, and there is a bias level on the TMDS channel. The offset level of the TMDS channel may affect the accuracy of the TMDS signal acquired by the display device, causing the display device to display an abnormal signal.
In order to solve the above problems, the present invention improves the control process of the HDMI interface, and after the display device is connected to the signal source device of the non-standard TMDS interface, the display device is controlled to prohibit the display mode from being switched, so that the display device and the signal source device transmit audio data and video data according to the specification defined by the existing EDID information, thereby ensuring the normal display function of the display device.
Fig. 2 is a flowchart of a HDMI interface control method according to an embodiment of the present invention. The main execution body of the method of the present embodiment may be the display device in fig. 1, as shown in fig. 2, the HDMI interface control method includes the following steps:
s201: and if the HDMI of the high-definition multimedia interface is detected to have the signal source equipment access, judging whether the equipment type of the signal source equipment is a nonstandard equipment type, wherein the nonstandard equipment type is the TMDS type of the signal source equipment, and the HDMI of the signal source equipment is a nonstandard minimized transmission differential signaling (TMDS) interface type.
In the embodiment of the invention, if the 18 th pin of the HDMI is detected to be at a high level, it is determined that the HDMI has signal source equipment to access. After the HDMI interface of the display device is connected to the signal source device, if the device type of the signal source device is a non-standard device type, display abnormality of the display device may occur if the display mode of the display device is switched at this time. The HDMI of the signal source device is a non-standard TMDS interface. In order to ensure that the display of the display device is normal, it is necessary to determine whether the device type of the signal source device is a non-standard device type before the display device switches the display mode.
S202: and if the equipment type of the signal source equipment is judged to be the non-standard equipment type, closing the EDID information switching function of the extended display.
In the embodiment of the present invention, if it is determined that the device type of the signal source device is a non-standard device type, in this case, if the display device selects and switches the display mode of the display device according to the requirement of the user, since the pull-up voltage is set in the non-standard TMDS interface of the signal source device, after the pull-up voltage on the TMDS channel of the display device is removed, the level on the TMDS channel is not 0v, and there is a bias level on the TMDS channel, which may affect the accuracy of the TMDS signal acquired by the display device, resulting in abnormal display of the display device.
In order to avoid display abnormality of the display equipment, if the equipment type of the signal source equipment is judged to be a non-standard equipment type, the EDID information switching function of the extended display is closed. And when the HDMI interface of the display equipment is accessed to the signal source equipment of the non-standard equipment type, the display equipment is forbidden to switch the EDID information. Specifically, the EDID information switching function of the extended display is closed by canceling the display of the control for selecting the EDID information switching command on the user interface.
It can be known from the foregoing embodiment that, after the display device is set to establish connection with the signal source device of the non-standard device type, the display device is controlled to prohibit switching of the EDID information, so that the display device and the signal source device transmit audio data and video data according to the specification defined by the existing EDID information, and the normal display function of the display device is ensured.
Fig. 3 is a flowchart of a HDMI interface control method according to an embodiment of the present invention. As shown in fig. 3, on the basis of the embodiment of fig. 2, determining in S201 whether the interface type of the signal source device is the non-standard transition minimized differential signaling TMDS interface type specifically includes the following steps:
s301: and generating a first control instruction, disconnecting a pull-up access switch of a TMDS signal channel of the HDMI according to the first control instruction, and setting a hot plug detection pin of the HDMI to be at a low level.
In the embodiment of the present invention, when the display device switches the display mode of the display device, i.e., switches the EDID information, according to the selection of the user, a first control instruction is first generated for turning off the pull-up path switch of the TMDS signal channel of the HDMI interface of the display device. Illustratively, the two switches D1 and D2 of the TMDS signal channel at the receiving end in fig. 1 are controlled to be turned off by the first control instruction. And setting the hot plug detection pin of the HDMI as a low level according to the first control instruction, so as to control the current display device to stop the communication of the HDMI.
S302: if the voltage of the HDMI TMDS signal channel is detected to be larger than a preset voltage threshold, judging that the equipment type of the signal source equipment is a non-standard equipment type; and if the voltage of the HDMI TMDS signal channel is detected to be less than or equal to the preset voltage threshold, judging that the equipment type of the signal source equipment is the standard equipment type.
When the pull-up path switch of the TMDS signal channel of the receiving end is turned off, but there is a voltage at the interface of the signal source device, the voltage of the HDMI TMDS signal channel may be caused to be greater than the preset voltage threshold.
Therefore, when the voltage of the HDMI TMDS signal channel of the receiving end is detected to be larger than the preset voltage threshold, the interface type of the signal source equipment can be judged to be the non-standard TMDS interface type, and the equipment type of the signal source equipment is the non-standard equipment type. And if the voltage of the HDMI TMDS signal channel is detected to be less than or equal to the preset voltage threshold, judging that the equipment type of the signal source equipment is the standard equipment type.
S303: generating a second control instruction, and controlling a pull-up channel switch of a TMDS signal channel of the HDMI to be closed according to the second control instruction so as to recover the pull-up voltage of the HDMI TMDS signal channel; and setting the hot plug detection pin of the HDMI to be high level according to the second control instruction.
In the embodiment of the present invention, after a result of whether the device type of the signal source device is the standard device type is obtained by detecting whether the voltage of the HDMI TMDS signal channel is greater than a preset voltage threshold, the normal communication function of the HDMI interface needs to be recovered. And the pull-up channel switch of the TMDS signal channel of the HDMI is controlled to be closed according to the second control instruction by generating the second control instruction so as to recover the pull-up voltage of the HDMI TMDS signal channel. And setting the hot plug detection pin of the HDMI as a high level according to the second control instruction, and informing the HDMI source end device that the display device recovers the normal communication function of the HDMI.
As can be seen from the foregoing embodiments, when the pull-up path switch of the TMDS signal channel of the HDMI interface of the display device is turned off, if it is detected that the voltage of the HDMI TMDS signal channel of the receiving end is greater than the preset voltage threshold, the interface type of the signal source device is the non-standard TMDS interface type, and the device type of the signal source device is the non-standard device type. The device type of the signal source device is determined by detecting whether the voltage of the HDMI TMDS signal channel is larger than a preset voltage threshold value, so that the display device is controlled to control the EDIE information to be switched according to the interface type of the signal source device, and abnormal display of the display device is avoided.
Fig. 4 is a flowchart of a HDMI interface control method provided in the embodiment of the present invention. As shown in fig. 4, on the basis of the embodiment of fig. 2, determining in S201 whether the interface type of the signal source device is the non-standard transition minimized differential signaling TMDS interface type specifically includes the following steps:
s401: and acquiring an information frame in the transmission data of the signal source equipment interface, and acquiring equipment type information of the signal source equipment according to the information frame.
In the embodiment of the invention, after the HDMI interface of the display device is connected to the signal source device, the display device obtains the information frame sent by the signal source device through the TMDS channel. The information frame includes basic information of the signal source device, and specifically, the information frame includes a device name, identification information, and specific provider information of the signal source device. The display device parses the received information frame to obtain specific provider information of the HDMI interface of the signal source device, and extracts interface type information representing the type of the interface device from the specific provider information. Illustratively, the display device parses the information frame to obtain HDMI Vendor Specific information frame (Vendor Specific information frame) information of the HDMI interface of the signal source device, and extracts three fields of data PB1 to PB3 from the information frame, wherein the three fields of data B1 to PB3 represent interface type information of the HDMI interface of the signal source device.
S402: and if the equipment type information of the signal source equipment is found in the preset non-standard equipment type information table, determining that the equipment type of the signal source equipment is the non-standard equipment type, and otherwise, determining that the equipment type of the signal source equipment is the standard equipment type.
In the real-time embodiment of the invention, a standard interface type information table is preset in the display device. The display device is pre-stored with a non-standard device type information table corresponding to the non-standard HDMI interface. Specifically, the preset non-standard device type table is a non-standard device type information table corresponding to the non-standard HDMI interface acquired and updated through the network. And acquiring a nonstandard equipment type information table through a network, wherein the nonstandard equipment type information table stores the equipment types of all signal source equipment which are provided with the nonstandard HDMI interface types on the current market. After the display device obtains the device type information of the signal source device, if the device type information which is the same as the device type information of the signal source device is found in the non-standard device type information table, the device type of the signal source device is determined to be the non-standard device type, that is, the TMDS interface type of the signal source device is the non-standard HDMI interface type, otherwise, the device type of the signal source device is determined to be the standard device type.
As can be seen from the foregoing embodiment, the display device obtains the device type information of the signal source device through the identified TMDS information frame, compares the device type information with the non-standard device type information table, and determines that the device type of the signal source device is the non-standard device type if the device type information that is the same as the device type information of the signal source device is found in the non-standard device type information table. And determining the equipment type of the signal source equipment through the non-standard equipment type information table, so that the display equipment is controlled to control the EDIE information to be switched according to the equipment type of the signal source equipment, and display abnormity of the display equipment is avoided.
Fig. 5 is a schematic structural diagram of an HDMI interface control apparatus according to an embodiment of the present invention. As shown in fig. 5, the HDMI interface control device includes: a generation module 501 and a shutdown module 502; the generating module 501 is configured to determine whether the device type of the signal source device is a non-standard device type if it is detected that the HDMI interface of the high-definition multimedia interface has the signal source device connected thereto, where the non-standard device type is a TMDS interface type in which the HDMI interface of the signal source device is a non-standard Transition Minimized Differential Signaling (TMDS); a closing module 502, configured to close the EDID information switching function of the extended display if it is determined that the device type of the signal source device is the non-standard device type.
In an embodiment of the present invention, the generating module 501 is further specifically configured to: generating a first control instruction, disconnecting a pull-up access switch of a TMDS signal channel of the HDMI according to the first control instruction, and setting a hot plug detection pin of the HDMI to be a low level; if the voltage of the HDMI TMDS signal channel is detected to be larger than a preset voltage threshold, judging that the equipment type of the signal source equipment is a non-standard equipment type; and if the voltage of the HDMI TMDS signal channel is detected to be less than or equal to the preset voltage threshold, judging that the equipment type of the signal source equipment is the standard equipment type.
In an embodiment of the present invention, the generating module 501 is further specifically configured to: generating a second control instruction, and controlling a pull-up access switch of a TMDS signal channel of the HDMI to be closed according to the second control instruction so as to recover the pull-up voltage of the HDMI TMDS signal channel; and setting the hot plug detection pin of the HDMI to be high level according to the second control instruction.
In an embodiment of the present invention, the generating module 501 is further specifically configured to: acquiring an information frame in the transmission data of the signal source equipment interface, and acquiring equipment type information of the signal source equipment according to the information frame; and if the equipment type information of the signal source equipment is found in the preset non-standard equipment type information table, determining that the equipment type of the signal source equipment is the non-standard equipment type, and otherwise, determining that the equipment type of the signal source equipment is the standard equipment type.
The apparatus provided in this embodiment may be used to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
Fig. 6 is a schematic diagram of a hardware structure of a display device according to an embodiment of the present invention. As shown in fig. 6, the display device of the present embodiment includes: a processor 601, a memory 602, and a computer program stored in the memory 602 and operable on the processor 601, the processor 601 implementing the following steps when executing the computer program: if the HDMI of the high-definition multimedia interface is detected to have signal source equipment access, judging whether the equipment type of the signal source equipment is a nonstandard equipment type, wherein the nonstandard equipment type is the TMDS type of the signal source equipment, and the HDMI of the signal source equipment is a nonstandard minimized transmission differential signal (TMDS) interface type; and if the equipment type of the signal source equipment is judged to be the non-standard equipment type, closing the EDID information switching function of the extended display.
Reference may be made in particular to the description relating to the method embodiments described above.
In one possible design, memory 602 may be separate or integrated with processor 601.
When the memory 602 is provided separately, the display device further includes a bus 603 for connecting the memory 602 and the processor 601.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer execution instruction is stored in the computer-readable storage medium, and when a processor executes the computer execution instruction, the HDMI interface control method is implemented as described above.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods described in the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. An HDMI interface control method is applied to a display device, and comprises the following steps:
if the HDMI of the high-definition multimedia interface is detected to have signal source equipment access, judging whether the equipment type of the signal source equipment is a nonstandard equipment type, wherein the nonstandard equipment type is the TMDS type of the signal source equipment, and the HDMI of the signal source equipment is a nonstandard minimized transmission differential signal (TMDS) interface type;
if the equipment type of the signal source equipment is judged to be a non-standard equipment type, closing the EDID information switching function of the extended display;
the determining whether the device type of the signal source device is a non-standard device type includes:
generating a first control instruction, disconnecting a pull-up access switch of a TMDS signal channel of the HDMI according to the first control instruction, and setting a hot plug detection pin of the HDMI to a low level;
if the voltage of the HDMI TMDS signal channel is detected to be larger than a preset voltage threshold, judging that the equipment type of the signal source equipment is a non-standard equipment type;
and if the voltage of the HDMI TMDS signal channel is detected to be smaller than or equal to a preset voltage threshold, judging that the equipment type of the signal source equipment is a standard equipment type.
2. The method according to claim 1, further comprising, after said closing the extended display identification data EDID information switching function:
generating a second control instruction, and controlling a pull-up access switch of a TMDS signal channel of the HDMI to be closed according to the second control instruction so as to recover the pull-up voltage of the HDMI TMDS signal channel;
and setting the hot plug detection pin of the HDMI to be at a high level according to the second control instruction.
3. The method according to claim 1 or 2, wherein the turning off the extended display identification data EDID information switching function includes:
and canceling the display of the control for selecting the EDID information switching command on the user interface.
4. An HDMI interface control apparatus, comprising:
the generating module is used for judging whether the equipment type of the signal source equipment is a nonstandard equipment type or not if the signal source equipment is detected to be accessed into the high-definition multimedia interface HDMI;
the closing module is used for closing the EDID information switching function of the extended display if the equipment type of the signal source equipment is judged to be a non-standard equipment type;
the generation module is specifically configured to generate a first control instruction, disconnect a pull-up path switch of a TMDS signal channel of the HDMI interface according to the first control instruction, and set a hot plug detection pin of the HDMI interface to a low level;
if the voltage of the HDMI TMDS signal channel is detected to be larger than a preset voltage threshold, judging that the equipment type of the signal source equipment is a non-standard equipment type;
and if the voltage of the HDMI TMDS signal channel is detected to be smaller than or equal to a preset voltage threshold, determining that the equipment type of the signal source equipment is a standard equipment type.
5. The apparatus according to claim 4, wherein the shutdown module is specifically configured to cancel displaying the control for selecting the EDID information switching command on the user interface.
6. A display device, comprising: at least one processor, a memory, the memory storing computer-executable instructions;
execution of computer-executable instructions stored by the memory by the at least one processor causes the at least one processor to perform the HDMI interface control method of any of claims 1-3.
7. A computer-readable storage medium having stored therein computer-executable instructions that, when executed by a processor, implement the HDMI interface control method of any one of claims 1 to 3.
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