What is the reason for the inconsistent chromaticity of the large led screen?

A good led large screen must be integrated into different temperatures and temperatures, everything can be used normally in various places, and it must have a good practical effect, especially in the case of large and medium-sized tour concerts, the animated lighting The effect needs to be displayed, but sometimes everyone will find that the LED chromaticity is different. What is the reason for the inconsistent chromaticity of the LED large screen? According to United's many years of work experience, the following three elements can be summarized to cause this situation. 1. Light-emitting components LED large-screen lighting components In the entire production process, inconsistent chromaticity of light-emitting diodes is inevitable. The precautionary measure for LED large screen manufacturers to listen to opinions is to classify after production.

The smaller the difference between two adjacent colors, the better the consistency, but the phenomenon of low output rate and high supply is less optimistic. Therefore, all manufacturers control the difference between two adjacent colors within 20%. 2. Driving components In general, the driver components of LED large screens are constant current power driver ICs, such as MBl5026 and so on.

This integrated IC contains 16 constant current power drive outputs, and the current output value can be set by resistors. The error of each output of the same integrated IC is controlled within 3%, and the output error of different integrated ICs is controlled within 6%. 3. The LED large screen is mixed with materials in the process of processing, and adopts a dot matrix of different batch numbers. How to solve the different colors of the led screen? One: Change the amount of current passing through the LED. Generally, the LED pipeline allows the current to be around 20mAh during continuous operation, except for the bright red saturation state.

Two: Utilize the plasticity of the visual effect of the human eye to complete the gray value operation through pulse width adjustment, that is, to change the light pulse width (ie, the pressure swing rate) regularly. If the cycle time of repeated lighting is short enough (that is, the screen refresh rate is high enough), the human eye will not feel the blinking of the shiny pixels. .