CN113490040A - HDMI (high-definition multimedia interface) -based transmission method and related device - Google Patents
HDMI (high-definition multimedia interface) -based transmission method and related device Download PDFInfo
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- CN113490040A CN113490040A CN202110837549.6A CN202110837549A CN113490040A CN 113490040 A CN113490040 A CN 113490040A CN 202110837549 A CN202110837549 A CN 202110837549A CN 113490040 A CN113490040 A CN 113490040A
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- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/12—Use of DVI or HDMI protocol in interfaces along the display data pipeline
Abstract
The embodiment of the application provides a transmission method based on an HDMI and a related device, and belongs to the technical field of display screen control. The HDMI-based transmission method includes: acquiring the type of a high-definition multimedia interface (HDMI); the HDMI is used for signal transmission between the upper computer and the display module; determining a first pin and a second pin of the HDMI according to the type of the HDMI; the first pin is adopted for video signal transmission, and the second pin is adopted for control signal transmission; the control signal is used for controlling the display module to display the image corresponding to the video signal. According to the method and the device provided by the embodiment of the application, the control signal and the video signal can be transmitted simultaneously through the HDMI data line, the circuit is greatly simplified, the structural complexity of the PCB is reduced, and the resources are saved.
Description
Technical Field
The present application relates to the field of display screen control technologies, and in particular, to a transmission method based on a High Definition Multimedia Interface (HDMI) and a related device.
Background
With the rapid development of modern industrial technology, LED display screens are gradually becoming widely used in people's life and industrial production processes. The LED display screen is simple to manufacture, can keep normal work in different environments, and has the characteristics of high resolution, wide visual range, long visual distance, large area and the like. The LED display screen is generally applied to the fields of outdoor advertising, commercial display, stage rental, data visualization and the like. In an LED display screen control system, an LED display screen is a flat panel display formed by splicing small LED modules or LED boxes and is used for displaying various information such as characters, images, videos and the like. And each LED box body comprises a receiving card and a plurality of LED lamp panels electrically connected to the receiving card, and the receiving card is used for driving the LED lamp panels to display. Some LED display screen's LED box still can dispose the switching card (Hub card) to be connected a plurality of LED lamp plates to the receiving card, the switching card here plays interface extension, signal switching's effect. Because the LED display screen can be widely applied to various scenes such as traffic signal lamps, literature shows, news releases and the like, the display requirements of people on the LED display screen are higher and higher. In the above application scenario of the LED display screen, it is necessary to rely on efficient data transmission to achieve a high-quality display effect of the LED display screen.
At present, transmission interfaces of an LED display screen are mainly classified into two categories, one is a transmission interface of a control command category, and is used for transmitting a control signal to control LED display; one is a transmission interface of video pictures, which is used to transmit video picture signals to be displayed, wherein the HDMI interface is a relatively common transmission interface of video pictures. In the above application scenario of the LED display screen, the LED display screen needs to access the video picture signal and the control signal at the same time to complete the corresponding display task.
However, the signal transmission method of the LED display screen needs to access a large number of data lines to complete transmission of different types of data, resulting in excessive line connection, complex structure of a Printed Circuit Board (PCB), and large resource consumption.
Disclosure of Invention
The embodiment of the application discloses a transmission method and a related device based on HDMI, a control signal and a video signal can be transmitted simultaneously through one HDMI data line, the circuit is greatly simplified, the structural complexity of a PCB is reduced, and resources are saved.
In a first aspect, an embodiment of the present application discloses a transmission method based on HDMI, including:
acquiring the type of a high-definition multimedia interface (HDMI); the HDMI is used for signal transmission between the upper computer and the display module;
determining a first pin and a second pin of the HDMI according to the type of the HDMI;
the first pin is adopted for video signal transmission, and the second pin is adopted for control signal transmission; the control signal is used for controlling the display module to display the image corresponding to the video signal.
In the embodiment of the application, at first, obtain the model of the high definition multimedia interface HDMI who carries out signal transmission between host computer and the display module assembly, according to the model of HDMI, find its corresponding interface definition, confirm the first pin and the second pin of HDMI according to the interface definition again, adopt first pin to carry out video signal transmission at last, adopt the second pin to carry out control signal transmission, thereby realize the different pins through an HDMI data line, control signal and video signal are transmitted simultaneously, control display module assembly shows the image that video signal corresponds, the circuit has been simplified greatly, PCB plate structure complexity has been reduced, and resources are saved.
In a possible implementation manner of the first aspect, the determining the first pin and the second pin of the HDMI according to the type of the HDMI specifically includes:
according to the type of the HDMI, identifying interface pin definitions corresponding to the type of the HDMI;
and determining the first pin and the second pin of the HDMI according to the interface pin definition.
In an embodiment of the present application, a possible specific implementation manner of determining the first pin and the second pin of the HDMI is provided, and specifically, according to a type of the HDMI, an interface pin definition corresponding to the type of the HDMI is recognized, and then the first pin and the second pin of the HDMI are determined according to the interface pin definition, so that a display module is controlled to display an image corresponding to a video signal through different pins of one HDMI data line while transmitting a control signal and the video signal.
In a possible implementation manner of the first aspect, the second pin includes a reserved pin of the HDMI, or an unused extended function pin of the HDMI.
In the embodiment of the application, the second pin for determining the HDMI can comprise a reserved pin of the HDMI or an unused extended function pin of the HDMI, and both the reserved pin and the unused extended function pin of the HDMI can transmit the control signal, so that a data line specially used for transmitting the control signal is saved, a circuit is simplified, and the structural complexity of a PCB is reduced.
In a possible implementation manner of the first aspect, the transmitting a control signal using the second pin includes:
under the condition that the HDMI is provided with at least two second pins, the second pins are adopted to carry out double-full-power transmission of the control signals; alternatively, the first and second electrodes may be,
in the case where the HDMI includes one second pin, the second pin is used to perform half-duplex transmission of the control signal.
In the embodiment of the present application, a possible specific implementation manner of using the second pin for control signal transmission is provided, and specifically, when the HDMI has at least two second pins, the second pin is used for performing duplex transmission of the control signal, and when the HDMI has one second pin, the second pin is used for performing half-duplex transmission of the control signal.
In a possible implementation manner of the first aspect, the control signal includes one or more of the following: adjusting parameters of video image quality and control instructions of video playing.
In this embodiment, the control signal transmitted by the second pin may include an adjustment parameter of video quality or a control instruction of video playing, and the control signal is applicable to all signals of serial communication.
In a second aspect, an embodiment of the present application discloses an HDMI-based transmission apparatus, including:
the acquisition unit is used for acquiring the type of a high-definition multimedia interface (HDMI); the HDMI is used for signal transmission between the upper computer and the display module;
the determining unit is used for determining a first pin and a second pin of the HDMI according to the type of the HDMI;
the transmission unit is used for transmitting video signals by adopting the first pin and transmitting control signals by adopting the second pin; the control signal is used for controlling the display module to display the image corresponding to the video signal.
In the embodiment of the application, at first, obtain the model of the high definition multimedia interface HDMI who carries out signal transmission between host computer and the display module assembly, according to the model of HDMI, find its corresponding interface definition, confirm the first pin and the second pin of HDMI according to the interface definition again, adopt first pin to carry out video signal transmission at last, adopt the second pin to carry out control signal transmission, thereby realize the different pins through an HDMI data line, control signal and video signal are transmitted simultaneously, control display module assembly shows the image that video signal corresponds, the circuit has been simplified greatly, PCB plate structure complexity has been reduced, and resources are saved.
In a possible implementation manner of the second aspect, the determining unit is specifically configured to identify, according to the type of the HDMI, an interface pin definition corresponding to the type of the HDMI;
the determining unit is specifically configured to determine the first pin and the second pin of the HDMI according to the interface pin definition.
In an embodiment of the present application, a possible specific implementation manner of determining the first pin and the second pin of the HDMI is provided, and specifically, according to a type of the HDMI, an interface pin definition corresponding to the type of the HDMI is recognized, and then the first pin and the second pin of the HDMI are determined according to the interface pin definition, so that a display module is controlled to display an image corresponding to a video signal through different pins of one HDMI data line while transmitting a control signal and the video signal.
In a possible implementation manner of the second aspect, the second pin includes a reserved pin of the HDMI, or an unused extended function pin of the HDMI.
In the embodiment of the application, the second pin for determining the HDMI can comprise a reserved pin of the HDMI or an unused extended function pin of the HDMI, and both the reserved pin and the unused extended function pin of the HDMI can transmit the control signal, so that a data line specially used for transmitting the control signal is saved, a circuit is simplified, and the structural complexity of a PCB is reduced.
In a possible implementation manner of the second aspect, the transmission unit is specifically configured to perform, when the HDMI has at least two second pins, a double-full-duplex transmission of the control signal by using the second pins; alternatively, the first and second electrodes may be,
the transmission unit is specifically configured to perform half-duplex transmission of the control signal using the second pin when the HDMI has the second pin.
In the embodiment of the present application, a possible specific implementation manner of using the second pin for control signal transmission is provided, and specifically, when the HDMI has at least two second pins, the second pin is used for performing duplex transmission of the control signal, and when the HDMI has one second pin, the second pin is used for performing half-duplex transmission of the control signal.
In a possible implementation manner of the second aspect, the control signal includes one or more of the following: adjusting parameters of video image quality and control instructions of video playing.
In this embodiment, the control signal transmitted by the second pin may include an adjustment parameter of video quality or a control instruction of video playing, and the control signal is applicable to all signals of serial communication.
In a third aspect, an embodiment of the present application discloses an electronic device for HDMI-based transmission, where the electronic device includes a memory and a processor, where the memory stores program instructions; the program instructions, when executed by a processor, cause the processor to perform a method as in the first aspect or any one of the possible implementations of the first aspect. Optionally, the electronic device further includes a transceiver, and the transceiver is configured to receive a signal or transmit a signal.
In a fourth aspect, an embodiment of the present application discloses a computer-readable storage medium, in which a computer program or instructions are stored; the method as in the first aspect or any one of the possible implementations of the first aspect is performed when the computer program or instructions are run on one or more processors.
In a fifth aspect, the present application discloses a computer program product comprising program instructions that, when executed by a processor, cause the processor to perform the method as in the first aspect or any one of the possible implementations of the first aspect.
In a sixth aspect, an embodiment of the present application provides a chip, where the chip includes a processor, and the processor is configured to execute instructions, and when the processor executes the instructions, the chip is caused to perform the method as described in the first aspect and any possible implementation manner. Optionally, the chip further includes a communication interface, and the communication interface is used for receiving signals or sending signals.
In a seventh aspect, an embodiment of the present application provides a system, where the system includes at least one transmission device as described in the second aspect, or an electronic device as described in the third aspect, or a chip as described in the sixth aspect.
Furthermore, in the process of executing the method described in the first aspect and any possible embodiment, the processor may be a processor dedicated to executing the method, or may be a processor that executes computer instructions in a memory to execute the method, such as a general-purpose processor. The Memory may be a non-transitory (non-transitory) Memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor or may be separately disposed on different chips.
In a possible embodiment, the at least one memory is located outside the device.
In yet another possible embodiment, the at least one memory is located within the device.
In yet another possible implementation, a portion of the at least one memory is located within the apparatus, and another portion of the memory is located outside the apparatus.
In this application, it is also possible that the processor and the memory are integrated in one device, i.e. that the processor and the memory are integrated together.
According to the embodiment of the application, the control signal and the video signal can be transmitted simultaneously through the HDMI data line, the circuit is greatly simplified, the structural complexity of the PCB is reduced, and resources are saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a display control architecture of an LED display screen according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an architecture of display control of another LED display screen according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating an architecture of an LED display module according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of a transmission method based on HDMI according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of control signal transmission according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an HDMI-based transmission apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described with reference to the accompanying drawings.
The terms "first" and "second," and the like in the description, claims, and drawings of the present application are used solely to distinguish between different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. Such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In this application, "at least one" means one or more, "a plurality" means two or more, "at least two" means two or three and three or more, "and/or" for describing an association relationship of associated objects, which means that there may be three relationships, for example, "a and/or B" may mean: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one item(s) below" or similar expressions refer to any combination of these items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b," a and c, "" b and c, "or" a and b and c.
An embodiment of the present application provides a transmission method based on an HDMI, which is applied to the technical field of light-emitting diode (LED) display screen control, and in order to describe a scheme of the present application more clearly, some knowledge related to an LED display screen is introduced first below.
LED display screen box: the LED display screen box is simply a screen body composed of a plurality of display units (unit display panels or unit display boxes) which can be combined and spliced. In order to meet different environments, a set of appropriate controllers (a main control board or a control system) is added, so that display boards (or unit boxes) with various specifications can be matched with controllers with different control technologies to form a plurality of LED display screens, and different display requirements are met.
LED display screen module: the LED display screen module (lamp panel) is one of the main components forming the finished LED display screen, and mainly comprises an LED lamp, a Printed Circuit Board (PCB), a driving chip, a resistor, a capacitor and a plastic external member.
High Definition Multimedia Interface (HDMI): is a full digital video and sound transmission interface, and can transmit uncompressed audio and video signals. The HDMI can be used for set-top boxes, DVD players, personal computers, televisions, game hosts, comprehensive amplifiers, digital stereos, televisions and other equipment. HDMI can send audio frequency and video signal simultaneously, because audio frequency and video signal adopt same wire rod, simplifies the installation degree of difficulty of system's circuit greatly.
In the display application scenario of the LED display screen, it is necessary to rely on efficient data transmission to achieve high-quality display effect of the LED display screen. At present, transmission interfaces of an LED display screen are mainly classified into two categories, one is a transmission interface of a control command category, and is used for transmitting a control signal to control LED display; one is a transmission interface of video pictures, which is used to transmit video picture signals to be displayed, wherein the HDMI interface is a relatively common transmission interface of video pictures. In the display application scene of the LED display screen, the LED display screen needs to be simultaneously accessed with a video picture signal and a control signal to complete the corresponding display task.
However, the signal transmission method of the LED display screen needs to access a large number of data lines to complete transmission of different types of data, resulting in excessive line connection, complex PCB structure and large resource consumption.
Aiming at the problems in the signal transmission method of the LED display screen, the application provides the transmission method based on the HDMI, which can realize serial control signal communication by utilizing the HDMI transmission line, does not influence normal picture transmission of the HDMI, can simplify a circuit, reduces the structural complexity of a PCB and saves resources.
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a display control architecture of an LED display screen according to an embodiment of the present disclosure. As shown in FIG. 1, the architecture diagram comprises an LED display screen, a control card, an LED screen control computer, a power supply and a switch. The power supply is used for supplying power to the control card and the LED display screen, and a user can control the on and off of the power supply through the switch, so that the control card and the LED display screen are controlled to be started. The LED screen control computer outputs video signals to the LED display screen, and the video signals are used for presenting corresponding image information through an LED display module or a lamp panel in the LED display screen. The LED screen control computer is connected with the control card through a network, and data transmission can be carried out between the LED screen control computer and the control card through a High Definition Multimedia Interface (HDMI) or a Digital Visual Interface (DVI). The internal structure of the control card mainly includes a Micro Controller Unit (MCU) and a Field Programmable Gate Array (FPGA). The MCU is used for processing test parameters and monitoring the working condition of the whole LED display screen box body, and the FPGA is used for receiving video signals sent by the LED screen control computer and driving a lamp panel of the LED display screen to display images corresponding to the video signals. The control card can forward the video signal of the LED screen control computer to the receiving card of the LED display screen after obtaining the power supply of the power supply to start, and the video signal forwarded by the control card is a parallel video signal. The LED display screen can start a driving module in the LED display screen after power supply of a power supply is obtained, and then an LED display module or a lamp panel in the LED display screen is started, the driving module in the LED display screen receives parallel video signals sent by a control card and converts the parallel video signals into serial video signals which can be identified by the LED display screen, the serial video signals are transmitted to the LED display screen, and after the LED display screen receives the serial video signals, the LED lamp beads are lightened and image information corresponding to the serial video signals is displayed.
Optionally, the architecture diagram may further include a power management module and a switch corresponding thereto, wherein the control card and the LED display screen each include a power supply for supplying power to the control card and the LED display screen. The user can control the control signal transmission of the power management module through the switch, and the control signal can be used for controlling the on and off of the power supply for the control card and the LED display screen, so that the effect of indirectly controlling the start of the control card and the LED display screen is achieved. Specifically, the control signal sent by the power management module may also be used to control the start timing of the power supplies for the control card and the LED display screen, that is, the control card and the LED display screen may be controlled to start in different timings.
Referring to fig. 2, fig. 2 is a schematic diagram of another structure of display control of an LED display screen according to an embodiment of the present disclosure. As shown in fig. 2, the structural diagram is a substantial component of an LED display screen, the LED display screen is formed by splicing one display unit, and M × N display units are spliced into an LED display screen, and the splicing manner includes, but is not limited to, the splicing manner in fig. 2. Each display unit represents an LED display module, and each LED display module comprises a plurality of LED lamp pearls. In the framework shown in fig. 2, the upper computer sends a display instruction, and after receiving the display instruction, the display module 1 in communication connection with the upper computer lights up the LED lamp bead to display image information corresponding to the display instruction; meanwhile, the display module 1 is also used as a switching interface to respectively switch the received display instruction to other display modules, and after the other display modules receive the display instruction, the LED lamp beads are correspondingly lightened to display the image information corresponding to the display instruction. The LED lamp beads are lighted together to display different characters, images and video information, and the LED lamp beads can be widely applied to various scenes such as traffic signal lamps, literature performances, news release and the like.
Specifically, the LED display module comprises the LED lamp beads and is internally composed of various component devices. Referring to fig. 3, fig. 3 is a schematic diagram of an architecture of an LED display module according to an embodiment of the present disclosure. The LED display module may be any one of the display modules 1 to (M + N) in the LED display screen shown in fig. 2, and includes a power supply, a power management module, a driving display system, a storage system, and a control system. The power supply is used for converting alternating current into direct current to be used by other functional modules (such as a power supply management module, a driving display system, a control system and a storage system). The power management module is used for managing a power supply and realizing a time-sharing power-on function, namely controlling the power-on time sequence of different functional modules (such as a driving display system, a storage system and a control system). The control system receives a control signal and a video signal sent by the upper computer, and the control signal is used for controlling the driving display system to display the image information corresponding to the video signal. The control system analyzes the control signal and the video signal, acquires image information corresponding to the video signal from the storage system, and transmits the acquired image information to a driving display system through a data channel, wherein the driving display system can be an FPGA driving display system and is used for displaying the image information corresponding to the video signal.
Based on the structure of the display control of the LED display screen provided in fig. 1 and fig. 2 and the structure of the LED display module provided in fig. 3, the present application further provides a transmission method based on HDMI, which can implement serial control signal communication by using an HDMI transmission line, and at the same time, does not affect normal picture transmission of HDMI, and can also simplify circuits, reduce the structural complexity of a PCB panel, and save resources.
Referring to fig. 4, fig. 4 is a schematic flow chart of a transmission method based on HDMI according to an embodiment of the present application, where the method includes, but is not limited to, the following steps:
step 401: and acquiring the type of the high-definition multimedia interface HDMI.
The electronic equipment obtains the type of a high-definition multimedia interface (HDMI), and the HDMI is used for signal transmission between the upper computer and the display module.
The electronic device in the embodiment of the present application is a device equipped with a processor capable of executing instructions executed by a computer, and the electronic device may be a control device capable of executing signal transmission, specifically, the LED screen control computer in fig. 1, or the upper computer in fig. 2, and is configured to control transmission of a control signal and a video signal in an LED display process, so as to simplify a circuit, reduce the complexity of a PCB structure, and save resources.
The LED display screen is composed of the plurality of display modules, and each LED display module is composed of various component devices, such as a control system, an FPGA driving display system, an FLASH storage system and the like. The upper computer sends a control signal and a video signal, and after an LED display screen in communication connection with the upper computer receives the control signal and the video signal, the LED lamp beads are lightened, and image information corresponding to the video signal is displayed. Specifically, one display module in the LED display screen receives the control signal and the video signal, and meanwhile, the display module is also used as a switching interface to forward the control signal and the video signal to other display modules in the LED display screen. The control signal is used for controlling the display module to display the image information corresponding to the video signal, and the video signal is used for representing the image information corresponding to the video signal. The LED lamp beads of the display modules are lighted together to display different characters, images and video information, and the LED lamp beads can be widely applied to various scenes such as traffic signal lamps, artistic performances, news release and the like.
Step 402: and determining a first pin and a second pin of the HDMI according to the type of the HDMI.
After the electronic equipment obtains the type of the HDMI, finding the interface pin definition corresponding to the HDMI according to the type of the HDMI, and determining the first pin and the second pin of the HDMI according to the interface pin definition.
The first pin is used for transmitting video signals between the upper computer and the display module, and the second pin is used for transmitting control signals between the upper computer and the display module.
In one possible implementation, the second pin of the HDMI may be determined to include a reserved pin of the HDMI or an extended function pin unused by the HDMI. The reserved pins and the unused extended function pins of the HDMI can both transmit control signals, data lines specially used for transmitting the control signals are saved, circuits are simplified, and the structural complexity of the PCB is reduced.
Specifically, based on the existing interface pin definition of HDMI, the HDMI interface can be mainly classified into A, B, C, D four categories. All four types of HDMI have Reserved (N.C) pin, which is Reserved pin of HDMI. According to different types of HDMI lines, the pin number of the Reserved (N.C) pin corresponding to the HDMI line is found, if the HDMI line is an A-type HDMI line, the Reserved (N.C) pin corresponding to the HDMI line is 14 pins, and if the HDMI line is a B-type HDMI line, the Reserved (N.C) pin corresponding to the HDMI line is 17 pins. In addition, the pin number of the unused extended function pin (CEC) corresponding to the HDMI line can be found according to different types of HDMI lines, if the HDMI line is a type a HDMI line, the unused extended function pin corresponding to the HDMI line is 13 pins, if the HDMI line is a type B HDMI line, the unused extended function pin corresponding to the HDMI line is 22 pins, if the HDMI line is a type C HDMI line, the unused extended function pin corresponding to the HDMI line is 14 pins, and if the HDMI line is a type D line, the unused extended function pin corresponding to the HDMI line is 15 pins.
Step 403: and the first pin is adopted for video signal transmission, and the second pin is adopted for control signal transmission.
The electronic equipment adopts the first pin to transmit the video signal, adopts the second pin to transmit the control signal, and the control signal is used for controlling the display module to display the image information corresponding to the video signal, thereby realizing the purpose of transmitting the control signal and the video signal simultaneously through different pins of one HDMI data line, controlling the display module to display the image corresponding to the video signal, greatly simplifying the circuit, reducing the structural complexity of the PCB and saving the resources.
In a possible embodiment, when the HDMI includes at least two second pins, the second pin is used for performing duplex transmission of the control signal, and when the HDMI includes one second pin, the second pin is used for performing half-duplex transmission of the control signal. In addition, the protocol standard for transmitting the control signal by using the second pin can be a serial communication mode such as RS-485, RS-232, RS-422 and the like. Through the embodiment of the application, the serial control signal communication can be realized by utilizing the HDMI transmission line, and the normal picture transmission of the HDMI is not influenced.
In a possible embodiment, the control signal transmitted by using the second pin may include an adjustment parameter of video quality or a control instruction of video playing, and the control signal is applicable to all signals of serial communication.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a control signal transmission according to an embodiment of the present disclosure.
As shown in fig. 5, three different communication channel transmission modes are provided, in which (a) in fig. 5 represents simplex transmission, (b) in fig. 5 represents half-duplex transmission, and (c) in fig. 5 represents full-duplex transmission. These communication channel transmissions may provide a means for information to be conveyed. The communication channels may be physical transmission media or logical connections through a multiplexed medium. Physical transmission media refers to materials capable of propagating energy waves, such as wires in data communications. A logical connection is typically referred to as a circuit switched connection or a packet mode virtual circuit connection, e.g. a wireless telecommunication channel. The information can be transmitted without obstruction due to the help of the communication channel.
As shown in fig. 5 (a), simplex data transmission only supports data transmission in one direction, and only one side can receive or transmit information at the same time, and bidirectional communication cannot be implemented, for example: television, broadcast communications, etc.
As shown in fig. 5 (b), half-duplex data transmission allows data to be transmitted in both directions, but at a certain time, data is allowed to be transmitted in only one direction, which is actually a simplex communication in which directions are switched, and only one direction can receive or transmit information at the same time, and bidirectional communication can be realized. For example: intercom communications, and the like.
As shown in fig. 5 (c), full-duplex data communication allows data to be transmitted in two directions simultaneously, and therefore, full-duplex communication is a combination of two simplex communication methods, which requires independent receiving and transmitting capabilities of both the transmitting device and the receiving device, and can simultaneously receive and transmit information at the same time, so as to realize bidirectional communication, for example: telephone communications, etc.
Specifically, in step 403 in fig. 4, the second pin is used for transmitting the control signal, and when the HDMI includes at least two second pins, the second pin is used for performing the duplex transmission of the control signal, which corresponds to the communication channel transmission method shown in fig. 5 (c); when the HDMI includes one second pin, the second pin is used for half-duplex transmission of the control signal, which corresponds to the communication channel transmission scheme shown in fig. 5 (b). In addition, the protocol standard for transmitting the control signal by using the second pin can be in serial communication modes such as RS-485, RS-232, RS-422 and the like. Through the embodiment of the application, the serial control signal communication can be realized by utilizing the HDMI transmission line, and the normal picture transmission of the HDMI is not influenced.
The method of the embodiments of the present application is explained in detail above, and the apparatus of the embodiments of the present application is provided below.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an HDMI-based transmission apparatus according to an embodiment of the present disclosure. The HDMI-based transmission apparatus 60 may include an acquisition unit 601, a determination unit 602, and a transmission unit 603, where the respective units are described as follows:
an obtaining unit 601, configured to obtain a model of a high-definition multimedia interface HDMI; the HDMI is used for signal transmission between the upper computer and the display module;
a determining unit 602, configured to determine a first pin and a second pin of the HDMI according to the type of the HDMI;
a transmission unit 603, configured to transmit a video signal using the first pin and transmit a control signal using the second pin; the control signal is used for controlling the display module to display the image corresponding to the video signal.
In the embodiment of the application, at first, obtain the model of the high definition multimedia interface HDMI who carries out signal transmission between host computer and the display module assembly, according to the model of HDMI, find its corresponding interface definition, confirm the first pin and the second pin of HDMI according to the interface definition again, adopt first pin to carry out video signal transmission at last, adopt the second pin to carry out control signal transmission, thereby realize the different pins through an HDMI data line, control signal and video signal are transmitted simultaneously, control display module assembly shows the image that video signal corresponds, the circuit has been simplified greatly, PCB plate structure complexity has been reduced, and resources are saved.
In a possible implementation manner, the determining unit 602 is specifically configured to identify, according to the type of the HDMI, an interface pin definition corresponding to the type of the HDMI;
the determining unit 602 is further configured to determine the first pin and the second pin of the HDMI according to the interface pin definition.
In an embodiment of the present application, a possible specific implementation manner of determining the first pin and the second pin of the HDMI is provided, and specifically, according to a type of the HDMI, an interface pin definition corresponding to the type of the HDMI is recognized, and then the first pin and the second pin of the HDMI are determined according to the interface pin definition, so that a display module is controlled to display an image corresponding to a video signal through different pins of one HDMI data line while transmitting a control signal and the video signal.
In a possible implementation manner, the second pin includes a reserved pin of the HDMI, or an unused extended function pin of the HDMI.
In the embodiment of the application, the second pin for determining the HDMI can comprise a reserved pin of the HDMI or an unused extended function pin of the HDMI, and both the reserved pin and the unused extended function pin of the HDMI can transmit the control signal, so that a data line specially used for transmitting the control signal is saved, a circuit is simplified, and the structural complexity of a PCB is reduced.
In a possible embodiment, the transmission unit 603 is specifically configured to, when the HDMI has at least two second pins, perform duplex transmission of the control signal using the second pins; alternatively, the first and second electrodes may be,
the transmission unit 603 is further configured to perform half-duplex transmission of the control signal using the second pin when the HDMI has the second pin.
In the embodiment of the present application, a possible specific implementation manner of using the second pin for control signal transmission is provided, and specifically, when the HDMI has at least two second pins, the second pin is used for performing duplex transmission of the control signal, and when the HDMI has one second pin, the second pin is used for performing half-duplex transmission of the control signal.
In a possible embodiment, the control signal comprises one or more of the following: adjusting parameters of video image quality and control instructions of video playing.
In this embodiment, the control signal transmitted by the second pin may include an adjustment parameter of video quality or a control instruction of video playing, and the control signal is applicable to all signals of serial communication.
According to the embodiment of the present application, the units in the apparatus shown in fig. 6 may be respectively or entirely combined into one or several other units, or some unit(s) therein may be further split into multiple functionally smaller units to form the unit(s), which may achieve the same operation without affecting the achievement of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the terminal-based terminal may also include other units, and in practical applications, these functions may also be implemented by being assisted by other units, and may be implemented by cooperation of multiple units.
It should be noted that the implementation of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 4.
In the HDMI-based transmission apparatus described in fig. 6, a control signal and a video signal can be transmitted simultaneously through one HDMI data line, which greatly simplifies the circuit, reduces the structural complexity of the PCB, and saves resources.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device 70 according to an embodiment of the present disclosure, where the electronic device 70 may include a memory 701 and a processor 702. Further optionally, a bus 703 may be included, wherein the memory 701 and the processor 702 are connected via the bus 703.
The memory 701 is used to provide a storage space, and data such as an operating system and a computer program may be stored in the storage space. The memory 701 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM).
The processor 702 is a module for performing arithmetic operations and logical operations, and may be one or a combination of plural kinds of processing modules such as a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a microprocessor unit (MPU), or the like.
The memory 701 stores a computer program, and the processor 702 calls the computer program stored in the memory 701 to perform the following operations:
acquiring the type of a high-definition multimedia interface (HDMI); the HDMI is used for signal transmission between the upper computer and the display module;
determining a first pin and a second pin of the HDMI according to the type of the HDMI;
the first pin is adopted for video signal transmission, and the second pin is adopted for control signal transmission; the control signal is used for controlling the display module to display the image corresponding to the video signal.
In the embodiment of the application, at first, obtain the model of the high definition multimedia interface HDMI who carries out signal transmission between host computer and the display module assembly, according to the model of HDMI, find its corresponding interface definition, confirm the first pin and the second pin of HDMI according to the interface definition again, adopt first pin to carry out video signal transmission at last, adopt the second pin to carry out control signal transmission, thereby realize the different pins through an HDMI data line, control signal and video signal are transmitted simultaneously, control display module assembly shows the image that video signal corresponds, the circuit has been simplified greatly, PCB plate structure complexity has been reduced, and resources are saved.
In a possible implementation manner, in the aspect of determining the first pin and the second pin of the HDMI according to the type of the HDMI, the processor 702 is further configured to:
according to the type of the HDMI, identifying interface pin definitions corresponding to the type of the HDMI;
and determining the first pin and the second pin of the HDMI according to the interface pin definition.
In an embodiment of the present application, a possible specific implementation manner of determining the first pin and the second pin of the HDMI is provided, and specifically, according to a type of the HDMI, an interface pin definition corresponding to the type of the HDMI is recognized, and then the first pin and the second pin of the HDMI are determined according to the interface pin definition, so that a display module is controlled to display an image corresponding to a video signal through different pins of one HDMI data line while transmitting a control signal and the video signal.
In a possible implementation manner, the second pin includes a reserved pin of the HDMI, or an unused extended function pin of the HDMI.
In the embodiment of the application, the second pin for determining the HDMI can comprise a reserved pin of the HDMI or an unused extended function pin of the HDMI, and both the reserved pin and the unused extended function pin of the HDMI can transmit the control signal, so that a data line specially used for transmitting the control signal is saved, a circuit is simplified, and the structural complexity of a PCB is reduced.
In a possible implementation manner, in terms of the control signal transmission using the second pin, the processor 702 is further configured to:
under the condition that the HDMI is provided with at least two second pins, the second pins are adopted to carry out double-full-power transmission of the control signals; alternatively, the first and second electrodes may be,
in the case where the HDMI includes one second pin, the second pin is used to perform half-duplex transmission of the control signal.
In the embodiment of the present application, a possible specific implementation manner of using the second pin for control signal transmission is provided, and specifically, when the HDMI has at least two second pins, the second pin is used for performing duplex transmission of the control signal, and when the HDMI has one second pin, the second pin is used for performing half-duplex transmission of the control signal.
In a possible embodiment, the control signal comprises one or more of the following: adjusting parameters of video image quality and control instructions of video playing.
In this embodiment, the control signal transmitted by the second pin may include an adjustment parameter of video quality or a control instruction of video playing, and the control signal is applicable to all signals of serial communication.
It should be noted that the specific implementation of the electronic device 70 may also correspond to the corresponding description of the method embodiment shown in fig. 4.
In the electronic device 70 depicted in fig. 7, the control signal and the video signal can be transmitted simultaneously through one HDMI data line, which greatly simplifies the circuit, reduces the complexity of the PCB structure, and saves resources.
The embodiment of the application also provides a computer readable storage medium, wherein a computer program or an instruction is stored in the computer readable storage medium; the HDMI-based transmission method shown in fig. 4 may be implemented when a computer program or instructions are run on one or more processors.
Embodiments of the present application further provide a computer program product, which when running on a processor, can implement the HDMI-based transmission method shown in fig. 4.
An embodiment of the present application further provides a chip, where the chip includes a processor, and the processor is configured to execute instructions, and when the processor executes the instructions, the method shown in fig. 4 may be implemented. Optionally, the chip further comprises a communication interface for inputting signals or outputting signals.
The embodiment of the present application further provides a system, which includes at least one HDMI-based transmission apparatus 60 or electronic device 70 or chip as described above.
In conclusion, through implementing the embodiment of the application, the control signal and the video signal can be transmitted simultaneously through one HDMI data line, so that the circuit is greatly simplified, the structural complexity of the PCB is reduced, and the resources are saved.
One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments can be implemented by hardware associated with a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the above method embodiments. And the aforementioned storage medium includes: various media that can store computer program code, such as a read-only memory ROM or a random access memory RAM, a magnetic disk, or an optical disk.
Claims (10)
1. An HDMI-based transmission method, comprising:
acquiring the type of a high-definition multimedia interface (HDMI); the HDMI is used for signal transmission between the upper computer and the display module;
determining a first pin and a second pin of the HDMI according to the type of the HDMI; the first pin is adopted for video signal transmission, and the second pin is adopted for control signal transmission; the control signal is used for controlling the display module to display the image corresponding to the video signal.
2. The method according to claim 1, wherein the determining the first pin and the second pin of the HDMI according to the type of the HDMI specifically comprises:
according to the type of the HDMI, identifying an interface pin definition corresponding to the type of the HDMI;
and determining the first pin and the second pin of the HDMI according to the interface pin definition.
3. The method according to claim 1 or 2, wherein the second pin comprises a reserved pin of the HDMI, or an extended function pin not used by the HDMI.
4. The method of claim 1, wherein the using the second pin for control signal transmission comprises:
under the condition that the HDMI is provided with at least two second pins, performing double-full-power transmission on the control signal by adopting the second pins; alternatively, the first and second electrodes may be,
and under the condition that the HDMI is provided with one second pin, performing half-duplex transmission of the control signal by adopting the second pin.
5. The method of any one of claims 1 to 4, wherein the control signal comprises one or more of: adjusting parameters of video image quality and control instructions of video playing.
6. An HDMI-based transmission apparatus, comprising:
the acquisition unit is used for acquiring the type of a high-definition multimedia interface (HDMI); the HDMI is used for signal transmission between the upper computer and the display module;
the determining unit is used for determining a first pin and a second pin of the HDMI according to the type of the HDMI;
the transmission unit is used for transmitting video signals by adopting the first pin and transmitting control signals by adopting the second pin; the control signal is used for controlling the display module to display the image corresponding to the video signal.
7. The apparatus according to claim 6, wherein the determining unit is specifically configured to identify, according to the type of the HDMI, an interface pin definition corresponding to the type of the HDMI;
the determining unit is specifically further configured to determine the first pin and the second pin of the HDMI according to the interface pin definition.
8. The apparatus according to claim 6, wherein the transmission unit is specifically configured to perform, in a case where the HDMI has at least two second pins, a duplex transmission of the control signal using the second pins; alternatively, the first and second electrodes may be,
the transmission unit is specifically further configured to perform half-duplex transmission of the control signal by using the second pin when the HDMI has the second pin.
9. An electronic device, comprising: a processor and a memory, wherein the memory stores program instructions; the program instructions, when executed by the processor, cause the processor to perform the method of any of claims 1 to 5.
10. A computer-readable storage medium having a computer program or instructions stored therein; the method according to any of claims 1 to 5, when the computer program or the instructions are run on one or more processors.
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