How to prevent LED light fade

The phenomenon of light decay of large-scale LED digital display and dot matrix display has always been a maintenance problem in the process of use. In addition to air-cooling and cooling, LEDs must also adopt constant current measures. A pixel (or a pixel tube, a module) composed of one or more LEDs is alternately lit under the control of a computer system, and its load is dynamic, and the IC integrated circuit constant current source cannot be matched with it. It is solved by MZD thermistor without changing the original circuit structure. It is convenient and economical to string a WMZD thermistor before or after each pixel (pixel tube, module) to compensate for the resistance bulb. Solved the LED light fade phenomenon. According to the current and string of the LED of the pixel, the number is connected in parallel to select WMZD. If the pixel tube is composed of 4~6 LEDs/18~20mA, a WMZD-A20 thermistor can be used in the loop. When the ambient temperature changes from -40 ° C to 120 ° C, the LED pixel tube current is always maintained at 18 ~ 20 mA. This effectively prevents the LED from fading, and the A20 thermistor consumes less than 60 mW.

If the LED pixel module is 100mA, a WMZD-B100 can be used in series. If the module is 200mA, two B100s can be connected in parallel and connected to the loop. The B100 consumes less than 65 milliwatts.

In short, the application of WMZD thermistor in the large-screen LED display is an innovation of LED drive technology. It does not require complicated detection methods. It is first to make a pixel tube, using a thermometer, an ammeter, an oven or a heater. You can practice to prove its effect.

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