Seven environmental factors that affect the life of full-color LED displays
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A full-color LED display is used as an electronic display device. Like general electronic devices, product performance is affected by changes in external environmental factors. These complex and ever-changing environmental factors, although not fatal to the full-color LED display, but the damage to reduce some of the components, affecting the normal life.
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1, the impact of temperature on product life
The failure rate of any product during its service life and only under suitable working conditions is very low. As the integrated electronic product, the led display screen is mainly composed of a control board, switching power supply, light-emitting device, etc. equipped with electronic components. Composition, and all of these life spans are closely related to working temperature. If the actual operating temperature exceeds the product's specified range of use, not only the life will be shortened, but also the product itself will be seriously damaged.
2. Effect of dust on product life
In order to maximize the average life of the led display, the threat from dust can not be ignored. In the environment where the dust is relatively large, because the printed board absorbs dust, the deposition of dust will affect the heat dissipation of the electronic components. This will cause the temperature of the components to rise, resulting in decreased thermal stability or even leakage of electricity. In severe cases, it will cause burnout. . In addition, dust absorbs moisture, corrodes electronic circuits, and causes short-circuit faults. Dust is small, but the harm to the product can not be underestimated. Therefore, it is necessary to regularly clean up to reduce the probability of failure. When cleaning the dust inside the display, remember to disconnect the power and be careful of safe operation.
3, the impact of moisture on product life
Although almost all displays can work in a 95% humidity environment, humidity is still another important factor affecting product life. Moist gas enters the inside of the IC device through the bonding surface of the encapsulating material and components, causing the internal circuit to oxidatively corrode and the high temperature during the group welding process causes the humid gas entering the IC to expand due to heat to generate pressure, so that the plastic from Internal separation (delamination) on the chip or lead frame, wire tie damage, chip damage, internal cracks and cracks that extend to the surface of the component, and even component bulging and bursting, also known as "popcorn", which will lead to assembly The repairs were even scrapped. What's more important is that those invisible and potential defects will be incorporated into the product, causing problems with the reliability of the product. Methods for improving the reliability of wet environments include the use of moisture-proof materials, dehumidifiers, and protective coating covers.
4. The effect of corrosive gases on product life
Humidity and salty air conditions can cause degradation of system performance because they can increase the corrosive effects of metal components and also facilitate the production of primary cells, especially when different types of metals are in contact. Another deleterious effect of moisture vapor and salt-containing air is the formation of a film on the surface of non-metallic parts that causes the insulation of these materials and degradation of the dielectric properties, thereby forming a leakage path. Absorption of moisture by the insulating material can also lead to an increase in the volume conductivity and dissipation coefficient of the material. Methods for improving the reliability of moist and salty air environments include the use of hermetic seals, moisture resistant materials, dehumidifiers, protective coatings/caps, and the use of different types of metals.
5, electromagnetic radiation on product life
The interference of RF radiation on electronic systems generally comes from two sources. One way is that electrical noise from the radiated field interferes directly into the system. Experiments have shown that when the field strength reaches 5V/m, the system will certainly make mistakes, and the electromagnetic interference will be enough to change the value of the CPU program counter PC, causing the microcomputer to "escape" the executing program, especially for small signal circuits. The memory does not work properly when the field strength is 15V/m. Another way of radio frequency interference is through the power supply. The transmission line of the external frame is equivalent to the receiving antenna and introduces radiation interference into the system. When this interference is serious, the power of the system itself can be burned.
6, the impact of vibration on product life
Electronic devices are often subjected to environmental shocks and vibrations during normal use and testing. When the resulting mechanical stress caused by the skew exceeds the allowable working stress of the component parts, this environment can cause physical damage to the parts and structural parts.
7, the impact of load on product life
Whether it is an integrated chip, an LED tube or a switching power supply, whether or not it operates at a rated load, the load is also an important factor that affects the lifespan. Because any component has a fatigue damage period, taking the power source as an example, the brand power supply can output 105%~135% of the power. However, if the power supply is operated under such a high load for a long time, the aging of the switching power supply must be accelerated. Of course, the switching power supply does not necessarily fail immediately, but it will quickly reduce its life.
Full-color LED display screens should not only be selected when choosing a reputable display screen manufacturer to ensure product quality, but also carefully and carefully when installing and using. It is necessary to reasonably control the temperature, humidity, and dust in the use environment, and also to interfere with the electromagnetic radiation around the full-color LED display screen to avoid damage to the power supply; it is also necessary to prevent the physical structure of the internal parts from tilting. damage. These seven environmental factors will directly and indirectly affect the display life, so led display manufacturers remind everyone to do the necessary prevention and treatment measures.