Today, we will introduce to you the standards that LCD display screen color gamut coverage is based on. Traditionally, we refer to color gamut coverage as color gamut. In different fields, the requirements for the coordinates of the three primary colors R, G, and B are not the same, which involves different color gamut evaluation standards. The standards for color gamut generally include the following:
1. NTSC Standard: In 1953, the National Television Standards Committee (NTSC) of the United States developed the NTSC standard based on the CIE1931 chromaticity chart, which is currently a commonly used standard in China.
2. The ITU-R BT.709 standard is a standard developed by the International Radio Consultative Committee (CCIR) in 1988 for television production in high-definition television (HDTV) studios.
3. SRGB standard: In 1996, the International Electrotechnical Commission (IEC) established a color gamut standard for digital images. This standard is mainly used in digital image acquisition equipment and has not been fully popularized on displays.
4. Adobe RGB standard: proposed by Adobe in 1998, it has a wider color space than sRGB and is generally used in printing, publishing, image processing, and other fields.
5. ITU-R BT.1361 standard: A wide color gamut standard based on Pointer color gamut developed by the International Telecommunication Union's Group for Radio Communications (ITU-R) in 1988.
6. The xvYCC standard is the latest generation of light gamut standards recognized by the International Electrotechnical Commission (IEC) and published as an international standard in January 2006. Its color range not only greatly exceeds the NTSC color gamut range, but can also reach twice the sRGB color gamut. This specification can define all visible colors to the naked eye.
The coordinates of the white light position, color temperature, and RGB primary color for sRGB, NTSC, and Adobe RGB are shown in the figure:
By combining the concept of color gamut coverage, it can be inferred that the NTSC color gamut is the ratio of the triangle area composed of a certain RGB three primary color coordinate to the triangle area composed of the NTSC standard RGB three color coordinates (as shown in Figure 2). The higher the ratio, the better the color expression.
The development of backlight from CCFL to LED indicates that people have increasingly high requirements for the color range that systems can display, so high color gamut will inevitably become the trend of LCD display screen development in the future.
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