CN111031371B - Single-line screen projection system and method - Google Patents
Single-line screen projection system and method Download PDFInfo
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- CN111031371B CN111031371B CN201911361099.7A CN201911361099A CN111031371B CN 111031371 B CN111031371 B CN 111031371B CN 201911361099 A CN201911361099 A CN 201911361099A CN 111031371 B CN111031371 B CN 111031371B
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4126—The peripheral being portable, e.g. PDAs or mobile phones
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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
- H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
Abstract
The invention discloses a single-line screen projection system and a single-line screen projection method, and relates to the technical field of data display. The system comprises screen projection equipment and display equipment which are directly connected through a USB TYPE-C cable; the display equipment is externally integrated with a USB TYPE-C interface, a PD management unit is arranged in the display equipment, and the board-level circuit is provided with an AC-to-DC power supply which can provide VBUS for the interface; the screen projection equipment is externally integrated with a USB TYPE-C interface, a PD management unit is arranged in the screen projection equipment, and a battery circuit is arranged in a board-level circuit; video data in the screen projection equipment is transmitted to the display equipment for screen projection operation, and meanwhile, electricity is taken from the VBUS of the display equipment to charge a battery of the screen projection equipment. The display equipment in the invention can receive the audio and video data from the screen projection equipment and simultaneously provide power supply for the screen projection equipment, thereby simplifying the interface and improving the convenience of use of a user.
Description
Technical Field
The invention relates to the technical field of data display.
Background
The smart phone is developed day by day, and the demand for mapping the display content of the smart phone to a large-size display in real time under a specific scene is increasing, and many manufacturers have implemented several screen projection schemes. The current screen projection schemes of mobile phones on the market are divided into two categories:
the first category, wireless screen projection schemes using WIFI, is shown in fig. 1. The transmission distance and convenience of wireless screen projection are the greatest advantages, but the wireless screen projection depends on network facilities such as wireless routing and the like, the real-time performance and reliability of data transmission are inferior to those of wired transmission, and the picture can also have delay of about 0.1S.
In the second category, a wired screen projection scheme for outputting images by using a USB (Universal Serial Bus) interface of a mobile phone is shown in fig. 2. For a user of a mobile phone, a wired Interface of the mobile phone is usually a USB Interface, and a common Interface of the display is an HDMI (High Definition Multimedia Interface), so that a USB-to-HDMI transfer bridge is often required to be added to convert image data sent by the mobile phone from USB signal transmission to HDMI for transmission to the display. By way of example, when a projection device (such as a mobile phone) and a display device (such as a television, a display, etc.) are connected, the installation sequence typically includes: the screen projection cable is taken out of the packaging box and generally provided with three line heads (a USB-to-HDMI bridge is integrated in the cable), one line head is a USB Micro-B interface and is connected into a mobile phone to be responsible for video output and charging power input, the other line head is an HDMI interface and is connected into a display device to be responsible for video input, and the third line head is a USB Type-A interface and can be connected into a USB power adapter or a USB host.
On one hand, for the three-head line screen projection cable, a user needs to spend time identifying the type of each cable head to clear the connection method, the three-head line screen projection cable is not friendly to the user, and the cable is integrated with a USB-to-HDMI bridge, is easy to be damaged in the using or carrying process and has poor durability.
On the other hand, in the screen projection process, if the USB Type-A interface needs to be accessed into the USB power adapter or the USB host interface for power supply of the mobile phone, the charging condition and difficulty of the mobile phone are increased to a certain extent, and the user experience is reduced.
Disclosure of Invention
The invention aims to: the defects of the prior art are overcome, and a single-line screen projection system and a single-line screen projection method are provided. The invention provides a single-wire screen projection scheme based on a USB TYPE-C interface, display equipment and screen projection equipment are directly connected through the USB TYPE-C interface wire without using a conversion bridge, the display equipment can provide power supply for the screen projection equipment while receiving audio and video data from the screen projection equipment, the interface is simplified, and the convenience of use of a user is improved.
In order to achieve the above object, the present invention provides the following technical solutions:
a single-line screen projection system comprises screen projection equipment and display equipment;
the screen projection equipment and the display equipment are directly connected through a USBTYPE-C cable to support data transmission, power transmission and video transmission;
the display equipment is externally integrated with a USB TYPE-C interface, a PD management unit is arranged in the display equipment, and the board-level circuit is provided with an AC-to-DC power supply and can provide VBUS for the interface;
the screen projection equipment is externally integrated with a USB TYPE-C interface, a PD management unit is arranged in the screen projection equipment, and a battery circuit is arranged in a board-level circuit;
video data in the screen projection equipment is transmitted to the display equipment through a USB TYPE-C cable to carry out screen projection operation, and meanwhile, the CC line of the USB TYPE-C interface is negotiated with the display equipment, so that electricity is taken from the display equipment to charge a battery of the screen projection equipment.
Furthermore, the CC lines of the USB TYPE-C interfaces of the display equipment and the screen projection equipment are connected with the PD management unit through the CC logic unit, and the PD management unit can coordinate the maximum current and voltage parameters of the screen projection equipment during charging.
Furthermore, a graphic processor, an encoder and a USB controller are arranged in the screen projection equipment, and video data are acquired from the graphic processor, compressed and then sent to a USB bus through the USB controller.
Further, a USB controller and a decoder are arranged in the display device, the USB controller receives video data from a D +/D-of USB2.0 or SSTX/SSRX differential bus of USB3.1/3.2, then transmits the video data to the decoder for decoding, and transmits the video data to a rear-end driving panel for display after performing corresponding scaling processing on the video data.
Furthermore, the screen projection device is a smart phone or a tablet computer or smart glasses or a smart watch, and the display device is a display or a television.
Further, the screen projection system adopts a USB2.0 or USB3.1 or USB3.2 communication protocol.
The invention also provides a screen projection method, which comprises the following steps:
video data in the screen projection equipment is transmitted to the display equipment through a USB TYPE-C cable for screen projection operation, and after USB enumeration is completed, a power supply role exchange request is initiated to the display equipment through a CC line, and power supply direction and power are renegotiated to obtain power supply input for charging a battery;
judging whether the negotiation is passed;
and when the judgment is passed, the display equipment charges the battery of the screen projection equipment.
Further, the screen projection device is a smart phone, the smart phone defaults to work first as a USB Host mode, and the VBUS inputs power to the display device.
Further, the display device judges whether the screen projection device is connected or not by detecting the voltage value of the CC line through the CC logic unit of the CC line, and controls the VBUS to be closed when detecting that the screen projection device is not connected.
Further, video data in the screen projection equipment is acquired from the graphics processor, compressed and sent to the USB bus by the USB controller; the USB controller of the display device receives video data from a D +/D-of USB2.0 or SSTX/SSRX differential bus of USB3.1/3.2, transmits the video data to a decoder for decoding, performs corresponding scaling processing on the video data, and transmits the video data to a rear-end driving panel for display.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects as examples: the invention provides a single-wire screen projection scheme based on a USB TYPE-C interface, display equipment and screen projection equipment are directly connected through the USB TYPE-C interface wire without using a conversion bridge, and the display equipment (such as a display) provides power supply for the screen projection equipment (such as a mobile phone) while receiving audio and video data from the screen projection equipment, so that the interface is simplified, and the convenience of use of a user is improved.
Drawings
Fig. 1 is a schematic diagram of a wireless screen projection in the prior art.
Fig. 2 is a schematic diagram of a wired screen projection in the prior art.
FIG. 3 is a hardware wiring diagram of a USB Type-C based wired screen projection provided by an embodiment of the present invention.
Fig. 4 is a system internal block diagram of a display according to an embodiment of the present invention.
Fig. 5 is a system internal block diagram of a smart phone according to an embodiment of the present invention.
Fig. 6 is a task processing flow chart of the single-line screen projection system according to the embodiment of the present invention.
Detailed Description
The single line screen projection system and method disclosed by the invention are further described in detail in the following with reference to the accompanying drawings and specific embodiments. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments. Thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
It should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the invention, which is defined by the claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions, should be construed as falling within the scope of the invention unless the function and objectives of the invention are affected. The scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that described or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
Examples
Referring to fig. 3, a single line screen projection system is disclosed.
The system comprises a screen projection device and a display device.
The screen projection equipment is a device for providing display data in the system, and comprises but is not limited to portable intelligent devices such as mobile phones, tablet computers, intelligent glasses and intelligent watches. In this embodiment, a smartphone having an OTG (0n-The-Go) function is preferable.
The display data sent by the screen projection device is generally the content displayed on its own screen, and of course, may also be other content different from the content displayed on its own screen, and should not be taken as a limitation to the present invention.
The display device is used for receiving display data sent by the screen projection device, and the display device comprises but is not limited to a display and a television. The display may be, for example, a liquid crystal display.
The size of the display screen of the display equipment can be far larger than that of the screen projection equipment, the display data are displayed on the display equipment, and a better display effect can be obtained.
In this embodiment, throw screen equipment and display device and directly link through USB TYPE-C Cable conductor (Cable), support to throw and carry out data (Date) transmission, Power (Power) transmission and Video (Video) transmission between screen equipment and the display device.
The USB Type-C can also be called Type-C for short, and is a hardware interface specification of a Universal Serial Bus (USB). Compared with the traditional USB Type-A, the USB interface has the advantages of thinner design, higher transmission speed (20 Gbps at most) and stronger power transmission (100W at most), and supports double-sided insertion of the USB interface. Meanwhile, the USB Type-C supports bidirectional power supply, so that the equipment can be charged and external equipment can be supplied with power; on the other hand, the expansion capability is strong, not only the USB protocol can be transmitted, but also other protocols can be multiplexed, such as: display Port (DP), Thunderbolt, Mobile high-definition link (MHL), Peripheral Component Interconnect express (PCIe), and the like.
The display device is externally integrated with a USB TYPE-C interface, a PD management unit is arranged in the display device, and the board level circuit is provided with an AC (Alternating Current) to DC (Direct Current) power supply which can provide VBUS (bus power supply) for the interface.
The screen projection equipment is externally integrated with a USB TYPE-C interface, a PD (Power delivery) management unit is arranged inside the screen projection equipment, and a battery circuit is arranged in the board-level circuit.
Video data in the screen projection equipment is transmitted to the display equipment through a USB TYPE-C cable to carry out screen projection operation, and meanwhile, the video data is negotiated with the display equipment through a CC (configuration channel) line of a USB TYPE-C interface, and electricity is taken from the display equipment to charge a battery of the screen projection equipment.
Preferably, the CC lines of the USB TYPE-C interfaces of the display device and the screen projection device are both connected to the PD management unit through a CC logic unit, and the PD management unit can coordinate the maximum current and voltage parameters of the screen projection device during charging.
In this embodiment, the screen projection device is further internally provided with a graphics processor, an encoder, and a USB controller, and video data is acquired from the graphics processor, compressed, and then sent to a USB bus by the USB controller.
The display device is internally provided with a USB controller and a decoder, the USB controller receives video data from a D +/D-of USB2.0 or SSTX/SSRX differential bus of USB3.1/3.2, transmits the video data to the decoder for decoding, performs corresponding scaling processing on the video data, and transmits the video data to a rear end driving panel for display.
The USB system in this embodiment may adopt USB2.0 or USB3.1 or USB3.2 communication protocols. In USB2.0 applications, insertion direction detection is not required, and in USB3.1 or USB3.2 applications, insertion direction detection is required.
The present embodiment will be described in detail below with reference to fig. 4 and 5, in which a display is used as the display device and a smart phone is used as the screen projection device.
Referring to fig. 4, the USB Type-C interface is integrated outside the display, and a pd (Power delivery) management unit is provided inside the display, and the CC Line (CC Line) is used to negotiate the Power and direction of the USB Power.
The board level circuit inside the display provides AC to DC power and can provide up to 100W of power output to the interface. The USB controller receives Video (Video) data from a D +/D-of USB2.0 or SSTX/SSRX differential bus of USB3.1/3.2, and sends the Video (Video) data to a Decoder (Decoder) for decoding, and the Video (Video) data is subjected to corresponding scaling processing and then sent to a back-end driving panel (Panels) for display.
Referring to fig. 5, the smartphone is the same as the display system, and also integrates a USB Type-C interface externally. The intelligent mobile phone is internally provided with a PD management unit, and a Battery (Battery) circuit is arranged in a board-level circuit.
Video data to be displayed is acquired from a Graphic Processing Unit (GPU), compressed by an encoder (encoder) and then sent to a USB bus by a USB controller, and the display receives the video data and then completes the subsequent screen projection work.
According to the technical scheme, a conversion bridge outside the display and the mobile phone is not needed, the display and the mobile phone are directly connected through the USB TYPE-C interface line, the display receives audio and video data from the mobile phone, meanwhile, power supply is provided for the mobile phone, and the use convenience of a user is improved.
The invention further provides a screen projection method implemented by the system. The screen projection method comprises the following steps:
step 100, transmitting video data in the screen projection device to the display device through a USB TYPE-C cable for screen projection operation, initiating a power role exchange request to the display device through a CC line after USB enumeration is completed, and performing renegotiation of power supply direction and power to obtain power supply input for battery charging.
Step 200, judging whether the negotiation is passed.
And 300, when the judgment is passed, the display device charges the battery of the screen projection device.
In this embodiment, throw screen equipment and display device and directly link through USB TYPE-C Cable conductor (Cable), support to throw and carry out data (Date) transmission, Power (Power) transmission and Video (Video) transmission between screen equipment and the display device.
The screen projection equipment is a device for providing display data in the system, and comprises but is not limited to portable intelligent devices such as mobile phones, tablet computers, intelligent glasses and intelligent watches. In this embodiment, a smartphone having an OTG (0n-The-Go) function is preferable.
The display data sent by the screen projection device is generally the content displayed on its own screen, and of course, may also be other content different from the content displayed on its own screen, and should not be taken as a limitation to the present invention.
The display device is used for receiving display data sent by the screen projection device, and the display device comprises but is not limited to a display and a television.
The size of the display screen of the display equipment can be far larger than that of the screen projection equipment, the display data are displayed on the display equipment, and a better display effect can be obtained.
The present embodiment will be described in detail below with a display as the display device and a smart phone as the screen projection device.
After the display and the smart phone are connected through the USB Type-C Cable line, when the smart phone defaults to work as a USB Hos t mode firstly, the VBUS line inputs power to the display, and the working process is shown as a marked line (I) in FIG. 6: after the equipment is connected through the USB interface, whether VBUS (bus power supply) is provided or not is judged; judging whether enumeration can be performed or not under the condition of judging that VBUS is provided; when enumeration is judged, the display device enters a receiving mode (Sink mode) and then enters a USB enumeration process; when it is determined that enumeration is impossible, it is negotiated whether power is sufficiently supplied, and in the case where power is sufficiently supplied, the display device enters a reception mode (Sinkmode), and then enters a USB enumeration process. In the screen projection process, after the USB enumeration is completed, the mobile phone initiates a Power Role Swap (Power Role Swap) request to the display device through the CC line to perform renegotiation of Power supply direction and Power to obtain Power supply input for charging the battery, the negotiation process is shown as a line marked in fig. 6, and after the negotiation is completed, the display device enters a Power output mode (Source mode) to supply a corresponding Power supply to the smart phone.
The USB enumeration process involves a USB power-on state (Power), a USB Default state (Default), a USB Address state (Address), and a USB configuration state (Configured).
In this embodiment, the display determines whether a screen projection device (such as a mobile phone) is connected by detecting a voltage value of the CC line through a CC logic unit of the CC line, and controls the VBUS to be turned off when detecting that the screen projection device is not connected. When a certain voltage is detected on the CC pin, the screen projection equipment is judged to be inserted, and VBUS is provided.
Video data in the screen projection equipment is compressed by the graphic processor and then sent to the USB bus by the USB controller; the USB controller of the display device receives video data from a D +/D-of USB2.0 or SSTX/SSRX differential bus of USB3.1/3.2, transmits the video data to a decoder for decoding, performs corresponding scaling processing on the video data, and transmits the video data to a rear-end driving panel for display.
The USB system in this embodiment may adopt USB2.0 or USB3.1 or USB3.2 communication protocols. In USB2.0 applications, insertion direction detection is not required, and in USB3.1 or USB3.2 applications, insertion direction detection is required.
Other technical features are described in the previous embodiment and are not described in detail herein.
It should be noted that, in the present invention, the device or apparatus may further include other components commonly found in a computing system, such as an operating system, a queue manager, a device driver, a database driver, or one or more network protocols, etc. stored in a memory and executed by a processor, which belong to the prior art and are not described herein again.
In the foregoing description, the disclosure of the present invention is not intended to limit itself to these aspects. Rather, the various components may be selectively and operatively combined in any number within the intended scope of the present disclosure. In addition, terms like "comprising," "including," and "having" should be interpreted as inclusive or open-ended, rather than exclusive or closed-ended, by default, unless explicitly defined to the contrary. All technical, scientific, or other terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. Common terms found in dictionaries should not be interpreted too ideally or too realistically in the context of related art documents unless the present disclosure expressly limits them to that. Any changes and modifications of the present invention based on the above disclosure will be within the scope of the appended claims.
Claims (8)
1. A single-line screen projection system comprises screen projection equipment and display equipment, and is characterized in that:
the screen projection equipment and the display equipment are directly connected through a USB TYPE-C cable to support data transmission, power transmission and video transmission;
the display equipment is externally integrated with a USB TYPE-C interface, a PD management unit is arranged in the display equipment, and the board-level circuit is provided with an AC-to-DC power supply and can provide VBUS for the interface; the display equipment is internally provided with a USB controller and a decoder, the USB controller receives video data and then transmits the video data to the decoder for decoding, and then the video data is subjected to corresponding scaling processing and then transmitted to a rear-end driving panel for display;
the screen projection equipment is externally integrated with a USB TYPE-C interface, a PD management unit is arranged in the screen projection equipment, and a battery circuit is arranged in a board-level circuit; the screen projection equipment is internally provided with a graphic processor, an encoder and a USB controller, video data are acquired from the graphic processor and are sent to a USB bus by the USB controller after being compressed by the encoder;
video data in the screen projection equipment is transmitted to the display equipment through a USB TYPE-C cable for screen projection operation, and meanwhile, the display equipment negotiates through a CC (communication control) line of a USB TYPE-C interface, and power is taken from the display equipment to charge a battery of the screen projection equipment; the display device and the screen projection device are connected with a PD management unit through a CC logic unit, wherein CC lines of USB TYPE-C interfaces of the display device and the screen projection device are connected with the PD management unit through the CC logic unit, and the PD management unit can coordinate maximum current and voltage parameters of the screen projection device during charging.
2. The system of claim 1, wherein: the USB controller inside the display device receives video data from either the D +/D-of USB2.0 or the SSTX/SSRX differential bus of USB 3.1/3.2.
3. The system of claim 1, wherein: the screen projection equipment is a smart phone or a tablet personal computer or smart glasses or a smart watch, and the display equipment is a display or a television.
4. The system of claim 1, wherein: the screen projection system adopts USB2.0 or USB3.1 or USB3.2 communication protocol.
5. A screen projection method according to the system of claim 1, comprising the steps of:
video data in the screen projection equipment is transmitted to the display equipment through a USB TYPE-C cable for screen projection operation, and after USB enumeration is completed, a power supply role exchange request is initiated to the display equipment through a CC line, and power supply direction and power are renegotiated to obtain power supply input for charging a battery; the video data in the screen projection equipment is acquired from the graphics processor, compressed by the encoder and then sent to the USB bus by the USB controller; the USB controller of the display device receives the video data, transmits the video data to the decoder for decoding, and transmits the video data to the rear-end driving panel for display after performing corresponding scaling processing on the video data;
judging whether the negotiation is passed;
and when the judgment is passed, the display equipment charges the battery of the screen projection equipment.
6. The method of claim 5, wherein: the screen projection equipment is a smart phone, the smart phone defaults to work firstly as a USB Host mode, and the VBUS inputs power to the display equipment.
7. The method of claim 5, wherein: the display equipment judges whether the screen projection equipment is connected or not by detecting the voltage value of the CC line through the CC logic unit of the CC line, and controls the VBUS to be closed when detecting that the screen projection equipment is not connected.
8. The method of claim 5, wherein: the USB controller of the display device receives video data from either the D +/D-of USB2.0 or the SSTX/SSRX differential bus of USB 3.1/3.2.
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| CN201911361099.7A CN111031371B (en) | 2019-12-25 | 2019-12-25 | Single-line screen projection system and method |
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| CN201911361099.7A CN111031371B (en) | 2019-12-25 | 2019-12-25 | Single-line screen projection system and method |
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| CN111031371B true CN111031371B (en) | 2022-03-04 |
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| CN111782170A (en) * | 2020-06-29 | 2020-10-16 | 深圳增强现实技术有限公司 | Display device |
| CN111757155A (en) * | 2020-06-30 | 2020-10-09 | 上海摩勤智能技术有限公司 | Display device and screen projection system |
| CN113031895A (en) * | 2021-03-30 | 2021-06-25 | 联想(北京)有限公司 | Screen projection control method and device and electronic equipment |
| CN115499691B (en) * | 2022-09-19 | 2023-05-12 | 重庆长安汽车股份有限公司 | Screen projection method and device of vehicle-mounted system, electronic equipment and storage medium |
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