After installing an outdoor full-color LED display, technical staff often face issues like inconsistent color and brightness during the adjustment phase. Based on years of experience in installation and debugging, Shandong-based LED display manufacturers have identified three main causes that lead to color and brightness discrepancies in both outdoor and indoor COB full-color displays.
First, the LED light-emitting components themselves can be a source of inconsistency. These are mounted directly onto the finished product, but if they aren't spectrally separated during production, variations in brightness and color can occur. Reputable manufacturers take extra steps after production to ensure that the brightness differences between adjacent LEDs are minimized, which improves consistency. However, this process reduces yield and increases inventory costs. Some manufacturers, in order to compete on price, skip this step entirely, mixing different levels of LEDs together, resulting in poor consistency and frequent color and brightness issues.
Second, driver chips play a significant role in brightness uniformity. Most outdoor full-color LED displays use constant-current driver chips, such as the MBL5024/26, which provide 16 constant-current outputs. The current can be adjusted using resistors, with each output having an error margin of up to 3%. Between different chips, the error can reach 6%. A 25% brightness difference between pixels is considered normal, but if LEDs used are not of the same quality or type, this difference can exceed 40%.
To address these inconsistencies, manufacturers can adjust the current flowing through the LEDs before finalizing the circuit design. Typically, LEDs can handle around 20 mA of continuous current, except for red LEDs, which may saturate at lower currents. Another method involves using pulse width modulation (PWM), taking advantage of the human eye's visual inertia. By adjusting the duty cycle of the light pulses, the display can achieve smooth gray scale transitions without visible flicker, especially when the refresh rate is high enough.
Almost all modern LED displays use PWM for gray control due to its compatibility with digital systems. It's important to note that color and brightness inconsistencies in outdoor full-color LED displays are often caused by manufacturing flaws and cannot be corrected by post-installation calibration tools. Therefore, it’s crucial to work with a reliable manufacturer that ensures consistent quality throughout the production process.
If you encounter brightness or color issues with your LED display, contact your service provider or manufacturer immediately. Most contracts include provisions for returns or replacements if quality problems arise before acceptance.
Shandong LED Display Manufacturer Shanda Tektronix has been a leader in the industry for many years. They offer free technical support and have advanced testing equipment to ensure the quality of their products. Whether you're looking for custom solutions or standard displays, they provide reliable and professional services tailored to your needs.
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