Starting from technical standards, true and false 4k start
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, 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 30 Hz, which means 30 frames of images are transmitted per second, while the maximum parameter of HDMI 2.0 is 60 Hz, 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. Normal 1920x1080 60Hz dot frequency is 148MHz, while 4K 60Hz dot 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 manufacturers, many manufacturers have begun to emphasize that their color space is 4:4:4. What exactly 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 contour and color information, only compress the color, and does not affect 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, that is The U and V signals represented by Chronma in the figure. The RGB compression of the three primary color signals is 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.
Xiongyun Nano 4K Frame Screen
1.2 The viewing angle is 160 degrees (2α), close to 180 degrees (2α), gain 1.3 (peak 1.5), non-polarized light, high imaging brightness, non-glaring, and soft reflection.
2. The screen resolution is 125 line pairs/mm, which is much higher than the standard of GB/T13982-2011 movie screen resolution ≥ 80 line pairs/mm, realizing high definition.
3. The reflectivity in the visible light band from 360 to 650nm is as high as 94%, the original color is reproduced, the image is transparent, and the picture is delicate.
4. Anti-static, anti-UV, no radiation, anti-aging, long service life. It adopts environmentally friendly materials and is laminated on the screen base after being processed by nanotechnology.
5. Suitable for the needs of different fields, such as: home theater, small theater, entertainment venues, etc.
Nano-structured rare metal structure crystalline derivative, the particle size is about 485 nanometers, the surface area is increased, and the number of atoms on the surface of each crystal grain increases, making the absorbance super strong.
Composed of multiple layers of optical materials, the three primary color wavelength bands are scattered on this layer, which can expand the viewing angle and obtain good field characteristics. In addition, the wavelength band of the three primary colors is vertical, and there is almost no color shift. Improve the color to get a brighter image.
Resolution comparison: Service life comparison:
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