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Answer The reason why the color and brightness of outdoor LED full-color display are inconsistent
After the outdoor LED full color display screen is installed, the technical personnel often encounters inconsistent chroma and brightness in the debugging process. Based on years of experience in installation and debugging, Shandong LED electronic display manufacturers have concluded that the following three factors can lead to Outdoor LED full-color display (including indoor COB full-color display) color, brightness inconsistencies. 1, led light-emitting components outdoor LED full-color display light-emitting components that is attached to the surface of the finished product lamp, in the production process of the finished product is not spectrophotometric separation. Quality-oriented LED electronic display manufacturers take steps to divide the product after completion of production. The smaller the difference in brightness between adjacent two levels, the better the consistency, but the lower the rate of production and the higher inventory severe. Some led electronic display manufacturers in order to fight the price war, do not do sub-light separation sub-file processing, the finished product lights are mixed to sell, the consistency of the lamp is poor, the display is relatively cheap, the chroma, brightness inconsistent The phenomenon will occur frequently. 2, driver chip outdoor full-color LED display driver chip is usually a constant current driver chip, such as MBl5024/26. These chips include 16 constant-current drive outputs. Resistors can be used to set the current output value. The error of each output of the same chip is controlled within 3%, and the output error of different chips is controlled within 6%. It is normal for 25% brightness error to appear between each pixel of the LED full-color display. If the LED light tube used is not the same level and type of full-color LED display screen, the brightness error will rise to more than 40%. How to solve the problem of outdoor LED electronic display (indoor COB full-color display, etc.) with different colors and brightness? The method: before the manufacturer of circuit boards to change the circuit design, change the current flowing through the LED, the general LED tube allows continuous current of about 20 mA, in addition to the saturation of the red LED, the other LED brightness and the flow of the current The second method: using the visual inertia of the human eye, using a pulse width modulation method to achieve gray control, that is, periodically change the light pulse width (ie, duty cycle), as long as the cycle of this repeated light is short enough (Ie the refresh rate is high enough), the human eye cannot feel the jitter of the luminescent pixels. Because pulse width modulation is more suitable for digital control, today, microcomputers are generally used to provide LED display content. Almost all LED electronic display screens use pulse width modulation to control the gray level. Also worth noting: Outdoor full-color LED display color, brightness is inconsistent, is the fundamental reason for the formation of Huaping, can not be corrected with the late proofreading equipment, as long as the led display manufacturers manufacturing process to achieve. Therefore, if you purchase a screen with inconsistent brightness, please contact your service provider or manufacturer to resolve it as soon as possible (general contract agreement: users can return the display if quality problems occur before acceptance). Shandong led display manufacturer Shanda Tektronix is ​​an early screen-display manufacturer in the Shandong industry. It provides free technical consulting services to customers. The factory has complete electronic testing equipment and can log in/as required.