Starting from technical standards, true and false 4k start-XY Screens-img

Starting from technical standards, true and false 4k start

by:XY Screens     2021-09-25
Regarding true and false 4K, it has always been a topic that manufacturers and users are generally concerned about. 4K refers to the resolution of 3840x2160 or 4096x2160. A signal with a width less than 3840 cannot be called 4K, and a signal with a height less than 2160 cannot be called 4K. The same 4K signal also has different differences, such as whether the frame rate is 30Hz or 60Hz, and the color space is YUV or RGB, etc. These bring obvious picture quality differences for display devices with very good display effects. Frame rate: 30Hz or 60Hz The maximum frame rate of the HDMI 1.4 standard is 30Hz, which means 30 frames of images are transmitted per second, while the maximum parameter of HDMI 2.0 is 60Hz, which means that 60 frames of images are transmitted per second. The parameter of 60 frames is twice as high as 30 frames, and the picture quality and details are better. The higher the number of frames, the smoother the picture. The intuitive experience is best reflected. When the angle of view is moved quickly, the afterimage of 60 frames is much less than 30 frames, and the value is higher. High, the closer the picture is to the real world observed by the human eye. The difficulty of 4K 60Hz processing lies in the large amount of data and high bandwidth. The common dot frequency of 1920x1080 60Hz is 148MHz, while the dot frequency of 4K 60Hz is 594MHz, which requires high signal transmission and processing. Color space 4:4:4 or 4:2:2 Recently in contact with signal processing manufacturers, many manufacturers have begun to emphasize that their color space is 4:4:4. What is this? In fact, for 4K, color space is also a very important parameter. The most widely used formats are RGB and YUV, both of which are a color coding method YUV. The YUV and RGB modes can be converted to each other. Just like RGB represents red, green and blue, the three letters YUV represent the brightness signal and the U and V color difference signals. Here, let me talk about YUV first, 4:4:4, which represents the three signal sampling storage methods of YUV. In addition to 4:4:4, the common ones are 4:2:2, 4:2:0, 4:1: 1 Three sampling formats. To put it simply, the 4:4:4 signal is lossless, the information is richer, and the picture color is better, but the storage space and transmission bandwidth requirements are very high. The other three methods are to save bandwidth and storage space, and the colors are compressed. The 4K we talked about before is mostly 4:2:2. Compared with RGB, YUV's compression method has inherent advantages. It can separate the information of contour and color, and only compress the color without affecting the contour. As shown in the figure above, the Y signal is Luma, which represents the brightness information, and intuitively is the outline. Whether it is 4:2:2 or 4:2:0 or 4:1:1, the brightness Y corresponds to 4, which means that the contour information will not be compressed. The compression is all about the color information. The U and V signals represented by Chronma in the figure. The RGB compressed signals of the three primary colors are more likely to affect the definition of the outline. YUV compression color is really a cost-effective compression method, but with the continuous development of technology and the increase of audience demand, YUV 4:4:4 has begun to increase. Summary: Due to different parameter standards, there is also our current 4K dispute. Nowadays, 4K display up to 60Hz 4:4:4 is generally called true 4K. With the continuous development of the demand in the audio-visual field, there are more and more display equipment and signal processing equipment that can meet this standard. Nano 4K frame screen product features: 1.2 viewing angle 160 degrees (2α), close to 180 degrees (2α), gain 1.3 (peak 1.5), non-polarized, high imaging brightness, non-glaring, soft reflection. 2. 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