meaning:
The refresh rate is the number of times the screen is refreshed per second. You can understand that when we watch a movie, what we see is actually a pair of static pictures. It's like putting on a slideshow, why do we feel that the picture is moving? That's because the human eye has a visual pause effect. The impression of the previous photo in the brain does not disappear, and the latter photo also follows. The difference between the two photos is very small, and a lot of sub-pictures are used in one action. . For display, we feel that the picture is moving. This pair of replacement pictures is refreshing. Assuming that an action completes 20 pictures, we look a bit like a comic, and this action is increased to 30. If it looks, it will look more natural. . This is the refresh rate.
The refresh rate is divided into vertical refresh rate and horizontal refresh rate. The refresh rate usually mentioned refers to the vertical refresh rate. The vertical refresh rate represents the number of times the screen image is redrawn per second, that is, the number of screen refreshes per second, in Hz (hertz). The higher the refresh rate, the better the image, the more natural the image, and the smaller the impact on the eyes. The lower the refresh rate, the more the image flickers, and the faster the eyestrain. Generally speaking, if you can achieve a refresh rate above 80Hz, you can completely eliminate image flicker and jitter, and your eyes will not be too tired. Obviously, the higher the refresh rate, the better, but it is recommended that you do not let the monitor always work at the highest refresh rate, which will accelerate the aging of the CRT tube, usually one or two lower than the highest refresh rate is more appropriate, and 85Hz is recommended. The lighting principle of the liquid crystal display (LCD) is different from the traditional CRT. Since each point of the liquid crystal display maintains the color and brightness after receiving the signal, it continuously emits light instead of a cathode ray tube display (CRT). ) It is necessary to constantly refresh the highlights. Therefore, the LCD splicing screen has high image quality and never flickers, which reduces eye fatigue to a minimum. The refresh rate has a more prominent meaning for CRT. Sometimes, LCD refresh rate is very high, but it will affect its service life and keep it at 60-75.
Influencing factors:
From a hardware point of view, the most important factor affecting the refresh rate is the bandwidth of the display. Now the general 17-inch color display has a bandwidth of about 100, which can reach 85 Hz. The larger the screen, the larger the bandwidth, 19 inches is about 200.21 inches is about 300, the same color and the same size, the higher the bandwidth, the more expensive. Secondly, there is a graphics card that affects the refresh rate. Graphics cards also have available refresh rates and resolutions, but in terms of refresh rates, this is completely negligible now, because this is mainly for older generation graphics cards, and now even antique TNT2 graphics cards. It can also support 1024 * 1024 * 768 resolution, which is the standard resolution of 17-inch CRT monitors. Therefore, the most important factor affecting the refresh rate is the bandwidth of the display.
