The life of LED electronic screen can be divided into economic life, technical life, service life and average life. how can we better ensure the normal use of LED electronic screens for indoor and outdoor rental fixed video walls? such as p2.5 p3.91 p4.81? What factors affect the life of LED electronic screen? Here is a brief introduction.
1. Influence of temperature on product life
The failure rate of any product is very low in the service life and only under the appropriate working conditions. As an integrated electronic product, LED electronic screen is mainly composed of control board with electronic components, switching power supply, light-emitting devices, etc., all of which are closely related to the working temperature. If the actual working temperature exceeds the specified service range of the product, not only the service life will be shortened, but also the product itself will be seriously damaged.
2. Influence of dust on product life
In order to maximize the average life of LED electronic screen, the threat of dust can not be ignored. When working in a dusty environment, due to the adsorption of dust on the PCB, the deposition of dust will affect the heat emission of electronic components, which will lead to the rise of component temperature, and then the decline of thermal stability or even the generation of leakage, which will lead to burnout in serious cases. In addition, dust will also absorb moisture, corrosion of electronic circuits, resulting in short circuit fault. Although the volume of dust is small, the harm to the product cannot be underestimated. Therefore, it is necessary to clean up regularly to reduce the probability of failure. When cleaning the dust inside the display screen, remember to disconnect the power supply and operate carefully.
3. Effect of humidity on product life
Almost all LED electronic screen panel can work normally in the environment of 95% humidity, but humidity is still an important factor affecting the product life. The wet gas will enter the IC device through the joint surface of packaging materials and components, causing oxidation corrosion and open circuit of internal circuit, and the high temperature in the process of assembly welding will make the wet gas inside the IC expand and generate pressure, which will make the plastic separate (delamination), wire bundle damage, chip damage, internal crack and extend to the surface of components The cracks, even the components bulge and burst, also known as “popcorn”, which will lead to the repair or even scrap of the assembly. What’s more important is that the invisible and potential defects will be incorporated into the product, which will cause the reliability of the product problems. The improvement methods of reliability in humid environment include the use of moisture-proof materials, dehumidifier, protective coating cover, etc.
4. Effect of corrosive gas on product life
Humidity and salty air environment can cause degradation of system performance, because they can aggravate the corrosion effect of metal parts, especially when different metals contact. Another harmful effect of wet steam and salty air is the formation of a film on the surface of non-metallic parts, which leads to the degradation of the insulation and dielectric properties of these materials, thus forming a leakage path. The moisture absorption of insulating materials can also increase the volume conductivity and dissipation coefficient of materials. Reliability improvements in humid and salty air environments include the use of airtight seals, moisture-proof materials, dehumidifiers, protective coatings / covers, and reduced use of different types of metals.
5. Influence of electromagnetic radiation on product life
The interference of RF radiation to electronic system generally comes from two ways. One way is that the electric noise interference of radiation field directly enters the system. The experiment shows that when the power reaches 5V / m on the spot, the system will definitely make mistakes. The electromagnetic interference is enough to change the value of the CPU program counter PC, so that the microcomputer “jumps out” of the executing program, especially for the small signal circuit. When the field strength is 15V/m, the memory can not work normally. Another way of radio-frequency interference is introduced by power supply. The transmission line of the outer frame is equivalent to the receiving antenna, which introduces the radiated interference into the system. When the interference is serious, the power supply of the system itself can be destroyed.
6. Effect of vibration on product life
Electronic equipment is often impacted and vibrated by environment in normal use and test. When the mechanical stress caused by the deflection exceeds the allowable working stress of the components, this kind of environment can cause physical damage to the components and structural parts.
7. Influence of load on product life
Whether integrated chip, LED tube or switching power supply works under rated load or not, load is also an important factor affecting life. Because every component has a fatigue damage period, take the power supply as an example, the brand power supply can output 105% ~ 135% of the power, but if the power supply works under such a high load for a long time, it will inevitably accelerate the aging of the switching power supply. Of course, the switching power supply may not fail immediately, but it will rapidly reduce its life.
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