First, 3+2 multi-primary color processing method:
In recent years, in the field of flat panel displays, I've been particularly interested in discussing 3+3 multi-primary color display ( red, green, blue, yellow, cyan, magenta ) as a way to expand the color gamut and reproduce more natural and vibrant colors. The question is, can LED displays support 3+3 multi-primary color technology?
Actually, when determining the driving strength for yellow and cyan primary colors, we follow three main principles:
1. While increasing color saturation, the color tone must remain unchanged.
2. The goal of adding yellow and cyan primary colors is to increase the color gamut and thus improve color saturation, but the overall brightness should not be affected.
3. Centered around D65; the endpoints of the RYGCB gamut are linearly extended within the range of the expanded color gamut points.
Guided by these three principles, we can determine the 3+2 multi-primary chromaticity processing method. However, to truly achieve a 3+2 multi-primary full-color screen, we need to overcome challenges such as insufficient brightness from yellow and cyan LEDs.
Second, color reproduction processing:
The development of pure blue and pure green LEDs has made full-color LED display screens popular due to their wide color gamut and high brightness. However, due to the significant deviation between the chromaticity coordinates of red, green, and blue LEDs and those of PAL TV red, green, and blue (see Table 1), the color reproduction of LED full-color screens is poor. Especially when displaying human skin tones, there is a noticeable visual discrepancy. This led to the emergence of color reproduction processing technology. Here, I recommend two methods for color reproduction:
1. Perform color coordinate transformation on the red, green, and blue primary color LEDs to make their coordinates as close as possible to those of PAL television , thereby greatly improving the color reproduction accuracy of the LED display . However, this method significantly reduces the color gamut and lowers the color saturation of the image.
2. Correct only the skin color gamut that is most sensitive to the human eye and reduce the original color saturation as much as possible for other less-sensitive color gamuts . This approach helps strike a balance between accurate color reproduction and maintaining good color saturation.
Third, chroma uniformity processing:
The issue of chromaticity uniformity in LED displays has always been a major challenge in the industry. It's commonly believed that uneven brightness can be corrected through individual point adjustments to improve brightness uniformity. However, chromaticity non-uniformity is considered difficult to correct and can only be improved by subdividing and filtering LED color coordinates.
As technology advances, new techniques are emerging to address these challenges, making it possible to achieve better color consistency and quality in LED displays.
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