Starting from the technical standard 4k big final!

Regarding true and false 4K, it has always been a topic of concern for both manufacturers and users. 4K refers to a resolution of 3840x2160 or 4096x2160, a signal with a width of less than 3840 cannot be called 4K, and a height of less than 2160 cannot be called 4K. The same 4K signal also has different differences, such as the frame frequency is 30Hz or 60Hz, the color space is YUV or RGB, etc. These display quality difference for the display device is very good contrast.

Frame frequency: 30Hz or 60Hz

The maximum frame rate of the HDMI 1.4 standard is 30 Hz, which means that 30 frames per second are transmitted. This parameter of HDMI 2.0 is a maximum of 60 Hz, that is, 60 frames per second. The parameters of 60 frames are twice as high as those of 30 frames, and the quality and detail are better. The higher the number of frames, the smoother the picture, and the most intuitive experience. In the case of fast moving angles of view, the 60 frames are much smaller than 30 frames. The numerical value is more High, the closer the picture is to the real world observed by the human eye.

The difficulty of 4K 60Hz processing lies in large data volume and high bandwidth. The common spot frequency of 1920x1080 60Hz is 148MHz, while the 4K 60Hz point frequency is 594MHz, which requires high signal transmission and processing.

Color Space 4:4:4 or 4:2:2

In recent contacts with signal processing vendors, many manufacturers have begun to emphasize that the color space is 4:4:4. What is this in the end?

In fact, color space is also a very important parameter for 4K. The most widely used are the RGB and YUV formats, which are all color-coded YUV. YUV and RGB mode can be converted to each other, and RGB represents red, green and blue, YUV three letters represent the brightness signal and U, V color difference signals.

Here, the first to say YUV, 4:4:4, represents the YUV signal storage of these three signals, in addition to 4:4:4, common 4:2:2, 4:2:0, 4:1: 1 Three sampling formats. In simple terms, the 4:4:4 signal is lossless, with richer information and better picture color, but it requires very high storage space and transmission bandwidth. The other three ways are to save bandwidth and storage space and to compress colors. The 4K that we said before was mostly 4:2:2.
Compared to RGB, YUV's compression method has an inherent advantage. It separates contour and color information, compresses only the color, and does not affect the contour. As shown in the above figure, the Y signal is Luma, which represents the brightness information. Intuitively, it is the outline. Whether it is 4:2:2 or 4:2:0 or 4:1:1, the luminance Y corresponds to 4, which means that the contour information will not be compressed. Compression is the compression of the color information. Diagram of the U and V signals represented by Chronma. The RGB compression of the three primary colors is more likely to affect the sharpness of the contour. YUV compression color is really a cost-effective compression method, but as the technology continues to develop and the audience's needs increase, YUV4:4:4 also began to increase.

Summary: Because of the different parameters and standards, there is now a dispute between our true and false 4K. Nowadays, a 4K display with a 4:4:4 ratio of 60 Hz is generally referred to as a true 4K. With the continuous development of demand in the audiovisual field, display equipment and signal processing equipment capable of achieving this standard are becoming more and more abundant.

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