For LED display screens, most people think that the main materials of the screen, LED and IC, have a life span of 100,000 hours. According to 365 days/year, 24 hours/day operation, the service life is more than 11 years, so most customers only care about using well-known of LEDs and ICs. In fact, these two are only necessary conditions, not sufficient conditions, because the rational use of red, green and blue lamps is more important to the display screen. display will be more important. Reasonable adjustment of the IC also helps to overcome the unreasonable wiring problem of the PCB
The key factors here are:
Since LEDs and ICs are semiconductor devices, they are picky about the use conditions of the environment, preferably around 25°C at room temperature, and their working mechanism is the best. But in fact, an outdoor large screen will be used in different temperature environments, which may be above 60°C in summer and below -20°C in winter.
When the manufacturer produces products, they use 25°C as the test condition, and classify different products into grades. However, the actual operating conditions are 60°C or -20°C. At this time, the working efficiency and performance of LEDs and ICs are inconsistent, and they may originally belong to the first grade. It will become multi-level, the brightness will be inconsistent, and the LED screen will naturally become blurred.
This is because the brightness attenuation and drop of the red, green and blue lamps are different under different temperature conditions. At 25°C, the white balance is normal, but at 60°C, the three-color LED The brightness of the screen has decreased, and its attenuation value is inconsistent, so the phenomenon of the entire screen brightness drop and color cast will occur, and the quality of the entire screen will decrease. And what about IC? The operating temperature range of IC is -40℃-85℃.
The temperature inside the box increases due to the high outside temperature. If the temperature inside the box exceeds 85°C, the IC will work unstable due to the high temperature, or the current between channels or the difference between chips will be too large due to different temperature drifts. lead to Huaping.
At the same time, the power supply is also very important. Because the power supply has different working stability, output voltage value and load capacity under different temperature conditions, because it is responsible for logistical support, its support ability directly affects the screen quality.
The design of the box is also very important for the display screen. On the one hand, it has the function of circuit protection, on the other hand, it has the function of safety, and also has the function of dustproof and waterproof. But what is more important is whether the design of the thermal loop system for ventilation and heat dissipation is good. With the extension of the boot time and the increase of the external temperature, the thermal drift of the components will also increase, resulting in poor image quality.
These factors are all interrelated and will affect the quality and life of the display. Therefore, when the customer selects the screen, he must also observe and analyze comprehensively and make a correct judgment.
Post time: Jul-22-2022
