In terms of display technology, an LCD is a display screen composed of liquid crystals, and an LED is a display screen composed of light-emitting diodes. Each pixel unit in the LED digital display is a light-emitting diode. If it is a single color, it is usually a red light-emitting diode. Let's take a look at the eight technologies and daily maintenance methods of LED warranty.
LED quality assurance eight major technologies
To produce a good quality LED display , technical control is required in the following aspects:
1. Anti-static LED display electronic display assembly factory should have good anti-static measures. Special anti-static grounding, anti-static floor, anti-static soldering iron, anti-static mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cutting machine) are basic requirements, and should be regularly tested by static electricity meter. .
2. Drive circuit design The layout of the driver circuit board driver IC on the LED display module will also affect the brightness of the LED. Since the driving IC output current is too far away on the PCB, the voltage drop of the transmission path is too large, which affects the normal operating voltage of the LED and causes its brightness to decrease. We often find that the brightness of the LEDs around the LED display module is lower than the middle, which is why. Therefore, to ensure the consistency of the display brightness, it is necessary to design the drive circuit distribution map.
3, design current value LED nominal current is 20mA, it is generally recommended that its maximum operating current is not more than 80% of the nominal value, especially for display screens with small dot spacing, due to poor heat dissipation conditions, should also reduce the current value . According to experience, due to the inconsistency of the red, green and blue LED attenuation speeds, the current values ​​of the blue and green LEDs are specifically reduced to maintain the consistency of the white balance after the display is used for a long time.
4. The LEDs of the same color and different brightness files need to be mixed with the lights, or the light patterns according to the discrete rule design are inserted to ensure the consistency of the brightness of each color of the whole screen. If there is a problem in this process, the local brightness of the display will be inconsistent, which will directly affect the display effect of the LED display.
5, control the verticality of the lamp For the in-line LED, there must be enough process technology to ensure that the LED is perpendicular to the PCB. Any deviation will affect the brightness consistency of the already set LEDs, and the color blocks with inconsistent brightness will appear.
6. The temperature and time of wave soldering must be strictly controlled. The recommended temperature is 100 °C ± 5 °C, the maximum temperature is not more than 120 °C, and the preheating temperature rises smoothly. The soldering temperature is required. For 245 °C ± 5 °C, the welding time is recommended not to exceed 3 seconds. After the furnace is over, avoid vibrating or impacting the LED until it returns to normal temperature. The temperature parameters of the wave soldering machine should be regularly checked. This is determined by the characteristics of the LED. Overheating or fluctuating temperature will directly damage the LED or cause LED quality hazard, especially for small and oval LEDs with small dimensions such as 3mm.
7. The virtual welding control LED display often has more than 50% probability of various types of virtual welding when the LED is not bright, such as LED pin soldering, IC pin soldering, pin header soldering Wait. Improvements in these problems require rigorous improvements in the process and enhanced quality inspections. The vibration test before leaving the factory is also a good test method.
8. Heat dissipation design LED will generate heat when working. If the temperature is too high, it will affect the attenuation speed and stability of the LED. Therefore, the heat dissipation design of the PCB board and the ventilation and heat dissipation design of the cabinet will affect the performance of the LED.
What is 5G CPE?
Definition of 5G CPE
CPE stands for Customer Premise Equipment. The so-called front end refers to the equipment in front of the customer's terminal equipment. When we use Wi-Fi, if the distance is far, or there are more rooms, it is easy to appear signal blind spots, resulting in mobile phones or ipads or computers can not receive Wi-Fi signals. The CPE can relay the Wi-Fi signal twice to extend the coverage of Wi-Fi.
What are the benefits of CPE?
Through the following comparison table, it is not difficult to understand the technical advantages of CPE products:
* Currently, the global 5G FWA service is mainly in the Sub-6GHz band, with only the United States and Italy supporting the millimeter wave band.
* 5G CPE integrates the low cost of Wi-Fi and the large bandwidth of 5G, combining the advantages of the two to form a strong complement to traditional fiber broadband.
The relationship between 5G, FWA and CPE
It can be said that FWA (Fixed Wireless Access) will be the most down-to-earth application of 5G technology. FWA business plays a key role in enabling "connecting the unconnected." FWA is a low-cost, easy-to-deploy flexible broadband solution. Compared with wired access technology, FWA has been an ideal choice for deploying broadband in many countries and regions because it does not need to obtain rights of way, dig trenches and bury cables, and drill holes through walls. The development of 5G technology is further promoting the development of FWA.
FWA services (including 4G and 5G) have reached 100 million users. FWA is no longer a niche service; The FWA industry as a whole has been supported by numerous suppliers. Why is that? In the 5G era, 5G CPE receives 5G signals from operator base stations and then converts them into Wi-Fi signals or wired signals to allow more local devices to get online. For operators, the initial user penetration rate of 5G is low, and the investment is difficult to realize quickly; The CPE business can use the idle network to increase revenue for operators, so major operators vigorously promote the development of 5G CPE.
FWA services can be used for both home (To C) and business (To B), and customers have different requirements for CPE devices when using FWA services in different application environments, resulting in consumer grade 5G CPE and industrial grade 5G CPE (similar to home routers and industrial routers).
In 2020, the global market size of 5G CPE will reach 3 million units, and it is expected that in the next five years, the market size of 5G CPE will maintain a compound growth rate of more than 100%, reaching 120 million units in 2025, with a market value of 60 billion yuan. As an important market for 5G CPE, China's 5G CPE market size will reach 1.5 million units in 2020 and is expected to reach 80 million units in 2025, with a market value of 27 billion yuan.
The difference between 5G CPE and other devices
CPE can support a large number of mobile terminals that access the Internet at the same time, and the device can be directly inserted with a SIM card to receive mobile signals. CPE can be widely used in rural areas, cities, hospitals, units, factories, communities and other wireless network access, can save the cost of laying wired networks.
A Router is a hardware device that connects two or more networks, acts as a gateway between networks, and is the main node device of the Internet. Routers use routes to determine the forwarding of data. If it is a home router, it does not support a SIM card slot, and can only receive signals by connecting to optical fiber or cable and then convert it into WI-FI to provide a certain number (several) of terminal devices to surf the Internet.
Industrial 5G CPE is equivalent to 5G industrial routers, and the technology of the two is not very different. On the one hand, the industrial 5G CPE converts 5G network signals into WiFi signals for transmission, and on the other hand, the data received by the WiFi network is converted into 5G network signals for uploading. In addition, industrial 5G CPE generally supports routing functions.
5G CPE trends
According to a research report, after evaluating the products of some mainstream 5G CPE suppliers, many institutions believe that the development of 5G CPE products will continue in two aspects: one is to support mmWave and Sub-6 GHz at the same time; Second, the design will pay attention to humanized operation and installation. The industry development trend will accelerate the demand for 5G in the medical, education and manufacturing industries due to the epidemic, and 5G FWA will promote global 5G CPE shipments.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.mcrouters.com