At the beginning of 2022, there is a lot of good news, SSD will reduce the price We have long said that the graphics card chip to meet the supply is only a prediction, do not mention, let's talk about the oversupply of displays today, the next of course is the same as the SSD - price reduction. This time it is estimated that most of the small partners choose 4K, 2K resolution, players will also choose high refresh rate products. In addition to the basic parameters of these products, there is also a problem that cannot be ignored, that is, interface bandwidth.
Yes, for the small partners who still use the display a few years ago, the interface requirements of these high-resolution, high-refresh rate products are completely different, which is why the HDMI and DP interfaces are constantly upgraded to increase bandwidth, have you kept up with their pace? As for the bandwidth of the two interfaces, I have said a lot before, here is not long,just look at the map.
We also have to know how much bandwidth the display needs to determine whether its interface is matched, whether the declared parameters are gimmicks or really playable, and whether their computers and graphics cards can keep up with the needs of the display. The most basic calculation method is to look at the resolution, color depth (number of colors) and refresh rate.
There are two key points in terms of resolution, one is to ensure the quality of the picture, it is necessary to send more data in addition to the nominal resolution, such as 4K (3840×2160) signals, and the pixel data in the width and height under the common standards are actually 4400 and 2250, respectively. The second is that each pixel actually has three primary color subpixels (there are also some special arrangements, which are not considered here), and by reconciling to display different colors, the transmitted data is actually the information of these three subpixels, so the real number of "pixels" has to be ×3.
As for the color depth, that is, the color of each subpixel is expressed with several bits of data, of course, the more data, the more color number of subpixels, the better the picture effect, such as the common 16.7M color number is 8bit color depth. The refresh rate is very simple, how many frames in a second, directly multiplied. So for a 4K@144Hz, the bandwidth requirements of 8bit color depth gaming monitors are at least 4400×2250×3×8×144 = 34.2144Gbps.
In addition to these basic data, there are now some other data, such as hdR mentioned in the previous push, some control data, etc., which also occupy a certain bandwidth, some interfaces can be carried with additional data channels, and some may occupy the nominal bandwidth. Although these data are much less than the screen data, if the interface bandwidth is only higher than the screen requirements, it may not be enough, and a higher level of interface standards must be used.
Then come compare the data to the individual bandwidths. Obviously, the aforementioned 4K@144Hz, an 8-bit deep-color display, requires at least an HDMI 2.1 interface, similar to 2K@200+Hz. As for the stronger DP 2.0, it seems to be ready for 8K displays.