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Huizhou Dronghootin Electronic Technology Co., LTD.

發布人:管理員 發布時間:2023-02-15


The same screen/projector is mainly a functional product that is used in home video, office conference, education and teaching, and large e-sports events to transfer video and video files of PC, notebook, mobile phone and other users in a targeted way, and display the same or different target content on a single or multiple other displays. Different from the traditional transmission mode of video and audio sources, the directional display of video and audio resources has been transformed from the original lack of flexibility, difficulty in popularization, difficulty in operation and high requirements to the application products that are easy to popularize, high flexibility, easy to operate, low difficulty in operation and low requirements in line with the modern fast-paced mode.


1、 Type of the same screen:
1. Wired same-screen device: Wired same-screen device is relatively common in daily life, and its appearance is mainly the style of connecting wire of PCBA plate of the same-screen device with HDMI. The realization of the same-screen function is to receive the current device screen or the target audio and video files in the device through the wire, and then transmit them to the corresponding video or external screen after processing by the function module of the same-screen device.


Features: In the current market, the cable projector has the advantages of stable transmission and imaging functions, low power consumption, low delay and low price; However, due to its wire, it is often not convenient to keep and place, and it is relatively inconvenient for screen projection.

2. Wireless same-screen device: compared with wired same-screen device, the wireless same-screen device removes the long and troublesome connecting wires, and wirelessly connects the device with the corresponding imager or external screen through the way of built-in signal module in the PCBA function module of the same-screen device, so as to realize the operation requirements of the same-screen function by wireless data transmission.


Features: The wireless same-screen device is convenient to use and can be used for long-distance transmission, but the price is generally high due to technical problems; Based on the different chip technologies, the wireless same-screen products can achieve different relevant definition, frame rate and stability. Compared with wired same-screen device, due to the influence of chip technology, transmission channel and network signal, wireless same-screen device generally has a certain degree of delay (100-360ms).

1、 Scenarios of application scope of the same screen:


1. Home theater, student online class, game expansion screen;



2. Business meetings;



3. E-sports competition site;



4. Use of large exhibition halls



5. Application of student education and teaching.


2、 Reasons for price difference of the same screen:
1. Different application operating systems: in general application scenarios, people will connect to the same screen device through mobile phones to perform the same screen operation of mobile phones and video terminals; Among mobile phone operating systems, there are Android and iOS systems. As we all know, the iOS system launched by Apple is not an open source system. All products of Apple companies will have a series of product certification technologies (MFI) based on the iOS system. Based on the MFI certification, all other electronic products that are allowed to access Apple products need to pay for this certification. So in terms of production cost, the price of same-screen device applied to iOS system will be higher than that applied to Android system.


2. Different operation modes: the principle of wired screen player is to transmit the signal at the operating end to the core plate of the screen player through the wire, convert the source signal into the video signal acceptable at the imaging end that meets the application requirements through the control of the chip, and then display the target content through the display. Under normal circumstances, the wired same-screen device can already be used in most environments; However, due to the need to simplify the usage in the application scenario, the wired same-screen device is doomed to be connected at the operating end without the line end, which will cause some problems; And because of the problem of wire, the transmission distance is limited, so the operator can't do other operations, and can only be fixed in one location as a class server. In this case, wireless same-screen device came into being; Under the same principle as the wired one, the wireless signal module is installed in the wireless one, which also solves the awkward problem of having to be connected, so that users can operate other contents at the same time without limiting the position and distance of the operator while using the same screen operation, which increases the flexibility of use.


3. Differences in functions and application scenarios: ordinary same-screen devices, whether wired or wireless, are mostly used between mobile phones and monitors. The relative product functions are relatively simple and cannot be applied to more operating terminals, such as PCs, notebooks, tablets, and so on. They can only be used for operations such as video playback, projection display, and electronic games. In order to adapt to the changing application environment and market needs, the solution companies and product factories are gradually introducing new same-screen products that adapt to more application environments to cope with large-scale business publicity, large-scale business conferences, exhibition halls, and even educational and teaching environments, effectively promoting the compatibility and practicality of relevant same-screen products; It makes the same screen product compatible with various operating terminals, and adds functions such as reverse control, one-to-many multi-screen projection, multi-screen segmentation, annotation and graffiti. At the same time, in order to avoid problems in various use scenarios, the optimization of chip technology and system software has been improved, and the related definition, frame rate, delay rate and stability have been greatly improved and improved. Therefore, due to the different use needs and scenarios, different same-screen products are also naturally divided into the difference between home-level and application-level same-screen devices, and the development investment, hardware and software investment naturally lead to the difference in product prices.
4、 The difference between single-band wireless same-screen device and dual-band wireless same-screen device:
Single-band wireless same-screen device refers to the wireless same-screen device with built-in single-band 2.4G wireless transmission module. In terms of functions, the 2.4G band is relatively common, has high popularity, supports many devices, has good signal through-wall performance, and has relatively long transmission distance, but is vulnerable to interference, low transmission bandwidth, and low stability. Therefore, the video definition, image hue and detail supported by the relative single-band wireless same-screen device will not be so good, and the same-screen device will face a certain degree of delay. The dual-band wireless same-screen device has a wireless transmission module of 2.4G and 5G signals. 5G belongs to the high-frequency channel frequency band, with large bandwidth and good stability, but its wall penetration is poor; However, the dual-channel wireless same-screen device just makes up for the shortcomings of the two frequency bands, enabling the same-screen device to convert channels or integrate channel functions according to the needs of the use scenario, so that the image projection of the same-screen device can achieve higher clarity and detail, and at the same time, it will have better improvement in delay.
6: Common problems with the same screen


1. Does the wireless same-screen device need a network?


The wireless same-screen device has its own signal module, which can be used to receive the network and transmit the signal. Therefore, the operator can use two different connection methods for the wireless same-screen device. The need to connect to the network in the use environment depends on the use needs. The network can be applied or not.


2. Can I perform other operations after the phone/computer is on the same screen?


After connecting the same screen device at the operating end for the same screen, you can select the video to be put on the display at the operating end for the screen projection operation, and then exit the video interface to process work on the operating end, WeChat chat, swipe short video, and play games without disturbing the video screen projection. However, for other non-video playback operations, the display interface will follow the operation terminal.


3. Can I use the same screen device for the old TV?


The basic requirement for using the same screen is that the display with VGA interface or HDMI interface can realize video signal transfer. The display principle is to receive electronic signals of video and audio for display and playback. Therefore, for the display requirements, as long as the display with VGA or HDMI interface can be connected to the same screen for normal use. However, the picture level and definition of old TV sets are naturally far from that of the endless displays launched at present; Although 4K co-screen is used, it is impossible to make it reach the image level of the theoretical value of the co-screen.
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