LED display technology from the monochrome display in the early 1980s, to the dual primary color display in the late 1980s, to the three primary color (full color) display in the mid-1990s, until today we are in the field of flat panel display Multi-primary (greater than three primary) processing techniques are discussed. The color processing technology of the LED display screen is selected from the most basic primary color wavelength selection, to the white field color temperature, to the color space conversion processing for improving the color reproduction degree, and the chromaticity uniformity processing for improving the image quality until Today we are dealing with multiple primary colors (greater than three primary colors) in order to expand the color gamut to reproduce more natural colors. Various color processing technologies have penetrated the development history of LED displays and become one of the core technologies in the comprehensive discipline of LED displays.
Various color processing techniques
1, the choice of the primary color wavelength
LED display has a wide range of applications in all walks of life, and different requirements for the primary color wavelength of LED in different applications, the choice of LED primary color wavelength is to achieve good visual effects, some to meet people's Habits, and some are more industry standards, national standards and even international standards. 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. For example, in the securities market display screen, people are usually accustomed to using red to indicate that the stock price has risen, green to indicate that the stock price has fallen, and to use yellow to indicate the flat. In the transportation industry, the blue-green band is strictly defined by the national standard, and the red band is prohibited. Therefore, the choice of the primary color wavelength is one of the important links of the LED display.
2, 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 random 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.
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