Reasons and solutions for inconsistent chromaticity of LED displays

A good LED display must be integrated in different temperatures and different temperatures, it can be used normally in various places, and it is bright and has a good practical effect at close range, especially in large and medium-sized concert tours, animation effect lighting effects need It is very good, but sometimes you will find that the LED color is different, what is the reason for the inconsistent chromaticity of the LED display? I have summarized the following three factors that can lead to inconsistent chromaticity of the LED display. 1. Luminous components The luminous components of LED display screens are LEDs. In the entire production process, inconsistent chromaticity of light-emitting diodes is inevitable. The precautionary measure for LED display manufacturers to listen to opinions is to sort after production.

The smaller the difference between two adjacent colors, the better the consistency, but the phenomenon of low yield and high supply is less optimistic. Therefore, all manufacturers control the difference between two adjacent colors within 20%. 2. Driving components LED display driving components are generally constant current driver ic, such as MBl5026 and so on.

The ic contains 16 constant current power driver outputs. 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 ic is controlled within 6%. It is normal for the LED display to show 25% chromaticity error between each definition. If used, LED light-emitting diodes are not at the same level. The type of brilliant LED display will increase the chromaticity error to more than 40%.

In addition, pay special attention to the fact that the inconsistent brightness of the brilliant LED display is the root cause of the screen flickering. The mechanical equipment in the middle and late audit cannot be corrected. If you rely on the LED display manufacturer to complete the entire manufacturing process.

Therefore, if you purchase a screen with inconsistent chromaticity, please contact your service provider or manufacturer to deal with it. 3. The display screen mixes materials in the process of processing, and adopts dot matrix with different batch numbers. How to solve the different color tone of the LED display? The first method: change the amount of current passing through: the LED current, the current that the general LED pipeline allows for continuous operation is about 20mAh, except for the bright red LED except the saturated state, most of the chromaticity of the LED is proportional to the passing current; the second method: use human The plasticity of the visual effect of the eye, the operation of the gray value is completed by adjusting the pulse width, that is, the light pulse width (ie, the pressure swing rate) is changed periodically.

If the cycle time of repeated lighting is short enough (i.e., the screen refresh rate is high enough), the human eye will not perceive the bright pixels vibrating. Because pulse width modulation is more suitable for computer control, microcomputers are widely used in display and LED display content today, basically all LED displays use pulse width modulation to control the gray level. .