国产精品欧美日韩一区_99这里都是精品_午夜精品国产精品大乳美女_免费看片国产_市来美保在线观看88av_亚洲黄色毛片

Your current location::Home >> News >> Industry News

LED high-definition LCD display various color processing skills

2019-02-22 3928

新聞.jpg

      Although the LED high-definition display is monochromatic, the LEDs of each color still have a half-wave width of about 30 to 50 nm, so the color saturation is limited. The colorful nature is so beautiful, unfortunately the existing LED display can not fully reproduce this beautiful scenery.


  First, the allocation of white field color coordinates:

  White field color coordinate modulation is one of the most basic technologies for full color LED display. However, in the mid-1990s, due to the lack of industry standards and basic testing methods, the white-field color coordinates were usually determined by the human eye and by feeling, resulting in the arbitrariness of severe color cast and white-field color temperature. With the promulgation of industry standards and the complete testing methods, many manufacturers have begun to regulate the full color screen color matching process. However, some manufacturers still use the theoretical guidance of lack of color matching, often at the expense of the gray level of some primary colors to match the hundred field color coordinates, the overall performance is not improved.

  In summary, we mainly discuss three aspects:

  1.How to improve the chroma uniformity of led HD display;

  2.How to expand the color gamut and restore more natural colors;

  3.How to improve the color reproduction degree of the led display;


  There are a wide range of applications in various industries, and there are different requirements for the primary wavelength of LEDs in different applications. The choice of LED primary color wavelength is to achieve good visual effects, and some to meet people's habits, and some It is also the regulation of industry standards, national standards and even international standards.


  The above-mentioned various color processing techniques are all interrelated in the specific implementation, and some aspects are not even compatible with fish and bear's paw. The integrated LED display screen also needs to perform brightness uniformity correction, gray scale nonlinear transformation, noise reduction processing, image enhancement processing, dynamic pixel processing, etc., and the whole signal processing flow is very complicated. Therefore, we must comprehensively weigh the performance from the perspective of the system, grasp the order of each treatment, and increase the depth of signal processing, in order to make the LED full-color display show a colorful, colorful and wonderful world.


  For example, the choice of the wavelength of the green tube in the full-color LED display; in the early days, the yellow-green LED with a wavelength of 570 nm was generally used. Although the cost is low, the color gamut of the display is small, the color reproduction is poor, and the brightness is low. After selecting a pure green tube with a wavelength of 525nm, the color gamut of the display has nearly doubled, and the color reproduction degree has been greatly improved, which greatly improves the visual effect of the display.


  Second, 3+2 multi-primary color processing method:

  In recent years, in the field of flat panel display, I am keen to discuss 3+3 multi-primary color display (red, green, blue, yellow, blue, purple) to expand the color gamut and reproduce more abundant natural colors. So, can the LED display achieve 3+3 multi-primary display?

  We know that in the visible range, yellow and blue are monochromatic, and we have high-yellow yellow and cyan LEDs. The purple color is the complex color, and the single-chip purple LED does not exist. Although we can not achieve red, green, blue plus yellow, blue, purple 3 + 3 multi-color led display. However, it is feasible to study red, green, blue, yellow, and blue 3+2 multi-color LED display screens. Because of the large number of high-saturation yellows and cyan in nature, the study has some value.


  In the current various TV standards, the video source has only three primary colors of red, green and blue, and no yellow or blue. Then, how to display the terminal yellow and blue primary colors?


  In fact, when determining the driving strength of the primary colors of yellow and cyan; we follow the following three principles:

  1.The purpose of increasing the primary colors of yellow and cyan is to expand the color gamut and thereby increase the color saturation. The overall brightness value cannot be changed;

  2.Do not change the color tone while increasing the color saturation;

  3.Centered on D65; with the RYGCB gamut boundary as the endpoint, linear expansion at each point in the gamut.


  Under the guidance of the above three principles: According to the gravity center law, we can find 3+2 multi-primary chromaticity processing methods. However, in order to truly realize the 3+2 multi-primary full-color screen, we have to overcome the difficulties of insufficient brightness of yellow and cyan LEDs;


  Third, chroma uniformity processing:

  The problem of uniformity of chroma of full-color led display has always been a big problem for the industry. It is generally believed that the brightness of the LED is not uniform and can be corrected by single point to improve the brightness uniformity. The chromaticity unevenness cannot be corrected, and can only be improved by subdividing and filtering the LED color coordinates.


  Fourth, color reproduction processing:

  The birth of pure blue and pure green LEDs has made the full-color LED display popular in the industry for its wide color gamut and high brightness. However, due to the large deviation of the chromaticity coordinates of the red, green and blue LEDs from the chromaticity coordinates of the PAL TV red, green and blue (see Table 1), the color reproduction of the LED full color screen is poor. Especially when expressing the skin color of a person, there is a visually significant deviation. As a result, color reproduction processing technology came into being. Here I recommend two methods of color reproduction:


  1.Correction is only appropriate for the most sensitive skin color gamut of the human eye; color gamuts that are not sensitive enough to other human eyes reduce the original color saturation as much as possible. This is done to achieve a balance between color reproduction and color saturation.


  2.The color coordinate transformation of the red, green and blue primary color LEDs is performed, so that the three primary color coordinates between the LED and the PAL television are as close as possible, thereby greatly improving the color reproduction degree of the LED display. However, this method greatly reduces the color gamut range of the led display, and the color saturation of the picture is greatly reduced.


  Fifth, the choice of the primary color wavelength:

  Led display screens are getting higher and higher with people's requirements for LED display screens. Only subdividing and screening LED color coordinates can not satisfy people's critical eye, and comprehensive correction processing is performed on the display screen to make chromaticity uniformity. Improvements are achievable.


  We found that even the same brand of the international first brand LED has large wavelength deviation and color saturation deviation, and the deviation range greatly exceeds the human eye's threshold for the identification of green chromatic aberration. Therefore, it is important to perform chromaticity uniformity correction. meaningful.


  In the CIE1931 chromaticity diagram, by gravity center

主站蜘蛛池模板: 欧美日韩国产免费一区二区三区 | 国产最全免费视频在线 | 国产999精品久久久影片官网 | 中文在线中文a | 国产成人精品日本亚洲第一区 | 精品一区二区三区视频日产 | 国产在线观看不卡一区二区三区 | 麻豆国产成人AV在线播放欲色 | 就去色播 | 夜色阁亚洲一区二区三区 | 日韩在线看片免费人成视频播放 | 最近最新中文免费字幕一 | 播放灌醉水嫩大学生国内精品 | 国产精品无圣光一区二区 | 日本高清视频在线观看 | 色窝窝无码一区二区三区 | 人妻丝袜AV中文系列先锋影音 | 双腿被绑成M型调教PLAY照片 | 日韩精品99 | 欧美高清视频 | wwwxxx在线播放| 五月丁香六月综合AV | 精品国产免费一区二区三区四区 | 亚洲爆乳中文字幕无码专区网站 | 在线观看三级网站 | 国产69精品久久99不卡免费版 | 成人精品久久一区二区三区 | av亚洲在线| 国产中日韩久久久噜噜久久 | 亚洲欧洲一区二区三区在线 | 久久久www免费人成精品 | 最近日本MV字幕免费观看 | 国产一区二区在线91 | 国产精品96久久久久久又黄又硬 | 成人一区在线观看 | 午夜男女爽爽影院网站 | 日本伊人精品一区二区三区观看方式 | 国产一级一片免费播放 | 在线超碰人人 | 白丝老师在我胯下娇喘视频 | 午夜一二区 |