The LED display has the advantages of high brightness, flexible installation, low energy consumption, etc., which makes it widely applicable to places with flexible display area and long viewing distance. At present, there are nearly a thousand LED display manufacturers in China, but there are less than 100 production scales (Easy is one of them).
For LED displays, their lifetime can be divided into economic life, technical life, service life and average life. The economic life of a product (also known as the value of life) is determined by the maintenance and depreciation of the product, usually based on the minimum annual average cost of use, the life of the product; the economic life is used to determine the most The old age and the best update timing; the technical life is the period in which the product has a technical value, that is, the length of the technical life is determined from the beginning of use of the product to the replacement of the new technologically advanced equipment. In the invisible wear rate of the device, in fact, the current technical life of the LED display is generally only 3 years; the service life refers to the time from the use of the product to the complete failure.
As an integrated system integrating LED display technology, visual principle, computer technology, video technology and electronic technology, LED display can be divided into independent parts, and each part is replaceable, so in actual use The life of LED displays is quite long, and some can even be decades. Average life (also known as mean time between failures or MTBF) refers to the time elapsed between two failures. It is a statistical average, the determination of MTBF value, usually using theoretical statistics and empirical statistics, theoretical statistical methods. Accumulated averaged data based on actual conditions of devices, components, and constraints. Empirical statistics are cumulative average data based on destructive records from factories or laboratories. Regardless of the method used, the reliability of the product changes regularly. Taking the failure rate as an example, its curve over time is like a bathtub, which is what is commonly called the "bathtub curve", as shown in Figure 1. As can be seen from the curve of the bathtub, the life of the product can be divided into three stages: early life; life; loss life.
The picture above shows the famous "bathtub" curve. The diagonal line on the left is the early failure rate, and the failure rate is generally high and drops rapidly over time. The middle of the curve is the service life, and the failure rate is generally low and basically fixed. The rightmost part is the wear period, and the failure rate increases rapidly. Electronic product manufacturers generally eliminate early failures by testing, aging, screening, etc., and then provide them to customers. When the service life period is over, the product is about to enter the high-risk period of failure, and needs to be scrapped or updated.
The impact of environmental factors on product life
1, the impact of temperature on product life
The failure rate of any product during the service life and only under the right working conditions is very low, and the LED display is an integrated electronic product, which is mainly composed of a control board, a switching power supply, a light-emitting device, etc. with electronic components attached thereto. Composition, and the lifetime of all of these is closely related to the operating temperature. If the actual operating temperature exceeds the scope of use specified by the product, not only will the lifespan be shortened, but the product itself will also be severely damaged.
2, the impact of dust on product life
To maximize the average life of LED displays, the threat of dust cannot be ignored. Working in a dusty environment, the printed board absorbs dust, and the deposition of dust will affect the heat dissipation of the electronic components, which will cause the temperature of the component to rise, resulting in a decrease in thermal stability or even leakage, which may cause burns in severe cases. . In addition, dust can also absorb moisture, corrode electronic circuits, and cause short-circuit failure. 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, remember to disconnect the power supply and handle it carefully.
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