What is the current standard of 4K? How to achieve 4K 60Hz?

Generally, the picture quality of 4K Ultra HD is mainly reflected in five aspects: resolution, color depth, color gamut, contrast and frame number.

Resolution: 4K, that is, 3840×2 160 pixels, which is four times that of traditional HD 1920× 1080. The more pixels a display can display, the finer the picture will be, and the more information can be displayed in the same screen area, so resolution is one of the very important performance indicators.

Color depth: The color depth specified in the Ultra HD Blu-ray standard is 10bit, which means that it can display 107 billion colors (each color in RGB has the power of 10, that is, 1024, while RGB tricolor * * has 107. The effect of 10bit is smooth in color transition and rich in color, while the ordinary Blu-ray standard supports 8-bit color depth, with only16.77 million colors, which is quite different.

Color gamut: BT.2020 color gamut standard. BT.2020 color space has been organized by ITU International Telecommunication Union as the color gamut standard for image signals in the 4K/8K era, and it is also one of the standards for ultra-high definition blue light. The common blue light standard uses BT.709 color space, which only covers 35.9% of BT.2020 color space, and it is the largest color space in display devices at present, covering 75.8% of CIE 193 1 color space.

Contrast: HDR high dynamic range image. HDR is not the first concept put forward by Ultra HD Blu-ray, but it is very important to improve the image quality, and it is also the most striking place in the Ultra HD Blu-ray standard. HDR has a high dynamic contrast, which can take into account the dark and highlight details on the screen, making the dynamic range closer to human vision. The contrast performance of ordinary TV, projector and other display devices is always limited due to the brightness limitation, that is, SDR (standard dynamic range) level. Generally, the contrast ratio of the LCD screen of our mobile phone is only 1000: 1. With the introduction of HDR, a wider contrast ratio 100000: 1 can be achieved.