Why do LED displays need to be calibrated point by point?

11 views admin 2025-06-05

In today's widespread use of LED displays, point-by-point correction has become a key technology to improve display quality. This technology ensures the overall uniformity and color accuracy of the screen by individually adjusting the brightness and chromaticity of each LED lamp bead. So why must LED displays be calibrated point by point?

LED chip production process determines the brightness and color of each lamp bead there are natural differences. Even for the same batch of products, the brightness deviation may reach 10%-20%, and the chromaticity coordinate difference even exceeds 0.01. This discrete nature will lead to color blocking, bright and dark spots and other problems on the screen, which will seriously affect the visual effect. For example, the brightness of red LEDs is usually low, while the brightness of green and blue LEDs is high, which can lead to color imbalance if not corrected. Industry standards require brightness uniformity ≥ 97%, chromaticity uniformity ± 0.003 Cx,Cy, point-by-point correction is the core means to solve this problem!

In the production process, module assembly precision, mask flatness, uneven heat dissipation and other factors will further amplify the differences in LED. For example, machining errors may lead to inconsistent spacing of light panels, forming bright or dark lines. And in long-term use, the LED light decay rate varies, the brightness may decay 3%-5% per year, and the chromaticity will gradually shift. If not corrected, the use of 1-2 years after the screen will be obvious “flower”, the commercial value of a significant decline.

With the popularity of LED display in the field of advertising, stage, monitoring, etc., the user of the display quality requirements are getting higher and higher. For example, large-scale concerts or sports events live need screen in different viewing angles to maintain color consistency, while the monitoring center is required to gray scale performance is delicate, to avoid misjudgment of information. The point-by-point correction technology can enhance the brightness uniformity to more than 98%, chromaticity unevenness control within Δu'v'=0.0014, to meet the needs of these high-end scenes. For example, the LED screen provided by Lianchengfa for the CCTV Tokyo Olympic Games broadcasting room realized seamless splicing and ultra-high definition display through the point-by-point correction, which ensured that the global audience received a consistent visual experience.

Early point-by-point correction relies on manual operation, low efficiency and high cost. Today, automated calibration systems based on CCD or CMOS sensors have become mainstream. For example, Dongguan Altai's patented technology through the optimization of algorithms to achieve real-time calibration in dynamic scenes, calibration efficiency by 20%. Meanwhile, the development of dynamic correction technology further solves the aging problem - by real-time monitoring of module lighting time, predicting the degree of light decay and automatically compensating for it, the screen life is extended by more than 30%. These technological breakthroughs enable point-by-point correction to move from high-end customization to large-scale application.

Point-by-point correction not only improves display quality, but also significantly reduces maintenance costs. Take a display worth millions of dollars as an example, regular correction can extend the “pleasant eye life” from 15,000 hours to 30,000 hours, reducing the frequency of replacement. In addition, the calibration of the screen in the secondary market, the residual value of higher, in line with the concept of green. Xiamen Quality Supervision and Inspection Institute developed an intelligent calibration instrument, through adaptive algorithms to achieve accurate compensation for different temperatures and viewing angles, the uniformity of white brightness after calibration of 98.5%, significantly improving the market competitiveness of the product.

Point-by-point calibration is the key to make LED display screen from “usable” to “usable”. It meets the demanding needs of high-end applications by solving the problems of discrete LEDs, manufacturing errors and aging, and at the same time brings significant economic benefits. With the continuous progress of technology, point-by-point correction will become the standard of LED display, promoting the display industry to higher quality development. Whether it is the colorful commercial advertisements or the accurate and reliable industrial monitoring, the point-by-point correction silently guarantees the perfect presentation of each pixel behind the scenes.