Indoor LED electronic screen, currently in the market using SMD display is a mainstream mature product, which is widely used in conference rooms, courts, public security bureaus, procuratorates, command centers, television stations, etc. at the same time, channel sales have been widely spread in shopping malls, dining halls, schools, public construction and other places.
For the general indoor LED electronic screen, when the product is delivered, it is in the state of zero failure, but after a period of use, there will be the phenomenon of broken lights and lights, and the situation of light falling due to human inadvertent collision; in the installation site environment, sometimes there will be unforeseen or unsatisfactory scene, for example, the air conditioner tuyere blowing directly from a short distance Due to the influence of temperature difference, a large area of bad points are caused, or the site environment is too humid, which causes the bad point rate of the screen to rise day by day.
How to solve the display screen problems caused by water vapor, dust, bumping, broken lamp rate and other factors, as well as improve the product quality and reduce the burden and cost of after-sales service, are the problems that led manufacturers want to solve.
Therefore, in order to effectively solve the problems mentioned, so as to produce the so-called surface coating solution.
This solution is based on the current indoor surface mounted LED electronic screen, and the equipment can be directly combined with the existing SMT surface mounted production line
The process is to make the lamp board by SMT surface mounting technology. After 72 hours of aging process, the surface of the lamp board is coated to form the so-called protective layer, which can wrap the conductive pins to isolate the influence of moisture and moisture, as shown in Figure 3.
For LED display products with general protection grade of IP40 (ipxx, front x dust-proof, rear x waterproof), it has the advantages of effectively improving the protection grade of LED lamp surface, providing anti-collision effect, avoiding lamp dropping and reducing the whole screen defect rate (PPM). At present, such solutions have met the market demand and are mature in production, and will not increase the overall cost burden excessively.
In addition, the protection process on the back of printed circuit board (PCB) keeps the three proofing paint protection process used in the past. Generally, the protection level on the back of PCB can be improved by spraying process. The integrated circuit surface (IC) is coated to form a protective layer to avoid the failure of the integrated circuit components of the drive circuit.
For the indoor LED display module, this solution can effectively prevent the failure points caused by moisture and dust by wrapping the exposed electrical conduction pins, and at the same time can provide the effect of collision protection. At present, the surface coating solutions on the market include gob display, AOB display, etc. Table 1 is the same as the general SMD display The comparison between the two.