Tips to make LED display screen better in color

If full-color display screens and LED electronic large screens are to have a good visual effect, chromaticity plays an important role. So how can we make the chromaticity of LED display screens more uniform and reasonable? The chromaticity uniformity of LED display screens has always been a major problem that has troubled industry insiders. It is generally believed that the uneven brightness of LEDs can be corrected at a single point to improve the brightness uniformity. However, chromaticity unevenness cannot be corrected and can only be improved by subdividing and screening the LED color coordinates.

As people's requirements for LED displays become higher and higher, simply segmenting and screening LED color coordinates can no longer satisfy people's discerning eyes. It is feasible to perform comprehensive correction processing on the display to improve the color uniformity.

We found that even the same grade of LED from the world's top brand has large wavelength deviation and color saturation deviation, and the deviation range far exceeds the threshold of the human eye to distinguish green color difference. Therefore, it is of great significance to perform color uniformity correction.

In the CIE1931 chromaticity diagram, according to the law of center of gravity, we find that: by mixing a certain proportion of red and blue with green at any point within the G range, the color coordinates of the mixed color can be adjusted to the intersection O of the straight line cR and the straight line dB.

Although it can greatly improve the color uniformity. However, the color saturation after correction is significantly reduced. At the same time, another prerequisite for using red and blue to correct the green color uniformity is that the three LEDs of red, green and blue in the same pixel should be distributed as concentratedly as possible so that the mixing distance of red, green and blue can be as close as possible to achieve better results. At present, the industry usually adopts the LED uniform distribution method, which will bring confusion to the color uniformity correction. In addition, how to carry out the measurement of the color coordinates of tens of thousands of red, green and blue LEDs is also an extremely difficult problem. We have given some tips for this.