Regarding how the full-color LED display will be displayed, chromaticity technology processing is very important. It is necessary to ensure that the colors displayed on the LED display are in line with people’s visual. Today, Doitvision will discuss this information about what are the chromaticity processing technologies of LED displays. We hope it can help you.
Table of Contents
The chromaticity processing technologies of LED displays
Color restoration processing
Perform color coordinate space transformation on the three primary colors of red, green and blue LEDs to make the color coordinates of the three primary colors between LED and PAL TV as close as possible, thereby greatly improving the color reproduction of the LED display. However, this method greatly reduces the color gamut of the LED display and greatly reduces the color saturation of the picture.
Only make appropriate corrections color gamut that the human eye is most sensitive to, and reduce the original color saturation as little as possible for other color gamuts that the human eye is not sensitive enough to. This process can achieve a balance between color reproduction and color saturation.
3+2 multi-primary color chroma processing method
Within the visible light range, yellow and cyan are monochromatic lights, and people can produce high-saturation yellow and cyan LEDs. Purple is a complex color light, and single-chip purple LED does not exist. Although we cannot achieve a 3+3 multi-primary color LED display of red, green, blue plus yellow, cyan and purple. However, it is available to study red, green, blue plus yellow and cyan 3+2 multi-primary color LED displays.
Since there are a large number of highly saturated yellow and cyan colors in nature; therefore, this research is of certain value. In various current TV standards, video sources only have three primary colors of red, green and blue, but not yellow and cyan.
Chroma Uniformity Processing
The problem of chromaticity uniformity of LED displays has always been a major problem in the industry. It is generally believed that the uneven brightness of LEDs can be corrected at a single point to improve the brightness uniformity. Uneven chromaticity cannot be corrected and can only be improved by subdividing the LED color coordinates.
Selection of primary color wavelength
As people’s requirements for LED displays are getting higher and higher, only subdividing LED color coordinates can no longer satisfy people’s needs. The LED display needs to be comprehensively corrected to ensure chromaticity uniformity. Although the color uniformity can be greatly improved. However, the corrected color saturation dropped significantly.
At the same time, another prerequisite for using red and blue to correct the uniformity of green chromaticity is that the three LEDs of red, green and blue in the same pixel should be distributed as concentrated as possible to make the mixing distance of red, green and blue as close as possible, to achieve better results.
At present, the LED uniform distribution method usually used in the industry will bring confusion to the chromaticity uniformity correction. In addition, how to measure the color coordinates of tens of thousands of red, green and blue LEDs is also an extremely difficult problem.
Allocation of white field color coordinates
White field color coordinate allocation is one of the most basic technologies for full-color LED displays. However, in the mid-1990s, due to the lack of industry standards and basic testing methods, white field color coordinates were usually determined by human eyes and feelings, resulting in severe color casts and arbitrary white field color temperature.
With the improvement of testing methods, many LED display manufacturers have begun to standardize the color-matching process of full-color LED screens. However, there are still some LED display manufacturers who lack theoretical guidance on color matching and often sacrifice the grayscale levels of certain primary colors to adjust white field color coordinates, resulting in poor overall performance.
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Summary:
The above-related technologies simple introduction. However, LED displays require uniform brightness correction, nonlinear grayscale transformation, noise reduction processing, image enhancement processing, etc. so that can produce a colorful and brilliant display.
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