ZJ080NA - 08 a county and the LED display

    Although LED hd display belong to monochromatic light, colorful LED still have around 30 ~ 50 nm half wave width, so the color saturation is limited. The colors of nature is so beautiful, it is a pity that the existing LED display cannot reproduce this beautiful scenery.

The deployment of a, white field color coordinate:
White field color coordinate mixing is one of the most basic technology of full color LED display screen. But in the mid - 90 - s of the 20th century, due to lack of industry standards and the basic means of testing, usually just by eye, by feeling sure white color coordinates, thus causing serious partial color and white color temperature of randomness. With the promulgation of the industry standard and testing means complete, many manufacturers began to standardize the full color matching process. But there are some manufacturers because of the lack of color theory instruction, often at the expense of some primary grey scale to allocate the color coordinates, comprehensive performance cannot be improved.
From what has been discussed above, we mainly discuss the problems of three aspects:
1, how to improve the led hd display chroma uniformity;
2, how to expand the color gamut, restore more natural colors;
3, how to improve the color of the led display reduction degree;
Line walks of life has a very wide range of applications, and applications in different places gezer wavelength has different requirements for the LED, LED gezer wavelength selection for some of them are in order to achieve good visual effects, some of them are in order to comply with the habits of people, and some is the industry standard, national standard, and even the rules of the international standard.
The foregoing chroma processing technology in the concrete implementation, are interrelated, some ways and even do not have your cake and eat it. Comprehensive led display must also brightness uniformity correction, gray nonlinear transform, noise reduction processing, image enhancement processing, dynamic pixel processing, etc., the whole process of signal processing is very complicated. Therefore, we must from the perspective of system to integrated balance of various performance, grasp the order of the various processing, and increase the depth of the signal processing, and to make the full color LED display screen to show a colorful, colorful world of good.
In full color LED display, for example, green tube gezer wavelength choice; Early generally choose the wavelength of 570 nm yellow-green LED, although the cost is low, but the display color gamut smaller, poor color reduction degree, low brightness. In choosing a wavelength of 525 nm, pure green tube display color gamut expanded nearly doubled, and the color reduction degree is greatly increased, greatly improve the visual effect of the display screen.
More than 2, 3 + 2 gezer chroma processing methods:
In recent years, in the field of flat display is keen to discuss 3 + 3 more gezer display (red, green, blue and yellow, green, purple), in order to expand the color gamut, reappear more abundant in nature. So, LED display can achieve 3 + 3 more gezer display?

We know that in the visible light range, yellow, green for the monochromatic light, we have high saturation of yellow and blue leds. And purple for complex color, single chip purple LED is not exist. Although we can't realize the red, green, blue and yellow, green, purple 3 + 3 color led display. However, the red, green, blue and yellow, and green 3 + 2 color led display is more feasible. Due to the nature exist a large number of high saturation of yellow and blue; Therefore, the study has a certain value.

In the present standard all kinds of TV, video source only red, green and blue three colors, without yellow, and green two color. Display terminal, then, yellow, and green two color how to drive?
In fact, when determining the yellow, and green two primary drive strength; We follow the following three principles:
1, increase the yellow and green two primary purpose is to enlarge the color gamut, thus improve the color saturation. But can't change the overall brightness value;
2, while improve the color saturation, can not change color;
3, D65 centered; To RYGCB color gamut boundary for the endpoint, at various points in the color gamut range for linear expansion.
Under the guidance of the above three principles: according to the laws of gravity center, we can find the color more than 3 + 2 primary processing method. However, to truly realize the 3 + 2 more gezer, full color, we have to overcome the lack of yellow, blue LED brightness; The rising cost of bigger difficulties, such as at present only in theory.
Three, chroma uniformity processing:
Full color led display chroma uniformity problem is always a difficulty of the personage inside course of study, it is generally believed the led brightness non-uniformity of single point calibration can be done, to improve the brightness uniformity. And chromaticity uneven cannot be calibrated, only by subdividing the LED color coordinates and selection to improve.

Four, color reduction treatment:
Pure blue, pure green LED to the birth of, make the full color LED display with its wide color gamut range, high brightness, sought after by industry. But, because of red, green and blue leds chromaticity coordinates and PAL TV chromaticity coordinates of red, green and blue have larger deviation (see table 1), LED full color color reduction degree was poor. Especially in the performance of color of skin, there was significant deviation on the vision. As a result, color reproduction processing technology arises at the historic moment. Here I recommend two kinds of color reproduction processing methods:
1, only to the human eye is most sensitive color gamut of appropriate correction. For other color gamut of the human eye is not sensitive to as little as possible to reduce the original color saturation. Such processing, can get a balance between color reduction degree and color saturation.
2, the three primary colors red, green and blue leds color space coordinate transformation between the LED and PAL TV sanki colored coordinates as near as possible, so as to greatly improve the color reproduction of LED display. However, this method greatly reduces the led display color gamut range, make the picture color saturation has fallen dramatically.
Five, the base color wavelength choice:
Led display in various as people more and more high to the requirement of led display, only to the led color coordinates are subdivided and filter have been unable to satisfy people captious eye, comprehensive correction of screen processing, the chroma uniformity is improved.
We found that even the first international brand with a LED also exist in the larger wavelength deviation and deviation, color saturation and the range of the deviation greatly exceeds the threshold value of the human eye to the green color identification, therefore, it is significant to chroma uniformity correction.

On the CIE1931 chromaticity diagram, according to the laws of gravity center, we found: in G gear (abcd) of any

 point within the scope of green mix proportion of red and blue, can adjust the color coordinates of the mixed color to the intersection of line cR and straight dB O.

While it is possible to make the chroma uniformity greatly improved. However, after correction, the color saturation decreases obviously. At the same time, use red and blue to green chroma uniformity correction within another premise is the same pixel three kinds of red, green and blue leds as far as possible USES the concentrated distribution of red, green and blue color mixture distance as nearly as possible, better effect can be achieved.
Now, the industry is usually adopted LED uniform distribution method will bring chaos chroma uniformity correction. In addition, tens of thousands of red, green and blue leds color coordinates measuring how underway is a very difficult problem. We give a hint.

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