How to choice the Right Refresh Rate?
what is the Refresh Rate?
The refresh rate refers to the number of times the screen is repeatedly displayed every second, and the unit is Hz. Refresh rate is an important indicator of the stability of LED screen.
Another concept that is easily confused with the refresh rate is the frame change frequency. Frame frequency refers to the attribute of video pieces, which means the number of times the picture information is updated per second, unit:
Hz (Hertz). In other words, change the frame frequency table, how many frames are there in the video per second . Due to the visual persistence effect of the (eye), when the frame change rate reaches the discrete.
The switched frame drawing looks continuous. Frame change frequency is an important indicator of video continuity.
Both refresh rate and frame changing frequency will affect the image quality. The refresh rate is the parameter index of the LED display device, and the frame change frequency is the attribute of the video file.
The higher the refresh rate, the lower the flicker of the picture and the sharper the image; The lower the refresh rate, the more likely the picture will flicker.
The better the continuity; If the frequency of changing frames is low, flickering may occur when is drawn. When the refresh frequency value reaches “picture flicker”, the frame change frequency will affect the flicker Ring.
what is the different on 1920hz,3840hz and 6240hz?
However, people eye’s perception of “flicker” is limited and presents individual characteristics. When the flickering frequency is 24Hz, our eyes cannot feel the flicker.
When the refresh rate and frame change frequency reach the limit critical value, the value will not help improve the LED display quality, and the performance price will decline. So refresh rate and frame change rate.
In our LED display Screen field, with the development of LED display technology, we have upgraded the original 480hz to 1920hz, 3840hz, or even 6240hz However, for 1920hz, 3840hz and 6240hz, how to distinguish them? Under normal circumstances, we humans can not identify them with the naked eye, because human eyes can not perceive when the frequency is greater than 24Hz.
All our indoor and outdoor screens can reach 3840hz. How did we get the so-called 3840hz refresh rate? The refresh rate is 3840hz, which is widely used in LED screen rental. It is a high refresh rate LED display. 3840hz, that is, 3840 times of display and screen refresh in 1 second. The current frame changing frequency of film is generally 24Hz, that is, only 24 frames are drawn in 1 second. Put a movie with a frame rate of 24Hz on an LED display with a refresh rate of 3840Hz, 3840/24=160 times, that is, each frame of the movie is refreshed 160 times by the display. At such a refresh speed, the eye does not feel the flickering of the painting, because the fluency and clarity of the display are often good.
So, by analogy, 3840hz is 160times by LED display screens, and 1920hz is 80times by display screen, and 6240hz is 260times by LED screen, it is high refresh rate.
LED Video Wall requirements on Refresh Rate?
The installation environment of LED display screen is different, and the refresh rate selected is also different, for example; BAITRONICS LED display screens are mainly divided into rental display screens, cob display screens, outdoor advertising display screens, etc. when our LL indoor display screens are used for stage performances, concerts and concerts, the audience likes to use their mobile phones or cameras to capture the scene of the stage. In order to ensure that the audience’s mobile phones or cameras can capture high-definition video images, our LED screen must be refreshed at 3840hz.
COB LED screen series is a UHD ultra-high definition LED display product, which is mainly used in some very important places such as live conference hall, studio hall, live broadcast and traffic command center. In order to provide ultra-high definition pictures and videos, all COB LED screens must achieve the effect of 6240hz or 3840hz.
1920hz is generally used for outdoor media advertising display screens(DOOH), such as outdoor advertising LED screen, outdoor video wall, etc. since the display screen is used outdoors and can provide high brightness, and the viewing distance of the audience is relatively far, generally 10m-200m, it is sufficient to refresh 1920hz for outdoor high brightness display screens for photography and video.
What’s the related to Refresh rate?
Generally speaking, when the refresh rate of LED display screen is higher than 1000Hz, human eyes can hardly distinguish it. When the refresh frequency is above 3000hz, it is a high-efficiency LED display screen. The higher the refresh rate, the more stable the picture display and the smoother the video playback will be. In addition, when shooting or photographing, the picture display will be clearer, and there will be no flickering or water wave stripes.
The low “refresh rate” of LED display screen will not only cause water wave stripes during camera shooting and photographing, but also cause images similar to tens of thousands of bulbs flashing at the same time. When people watch, they may feel uncomfortable and even cause damage to their eyes.
The refresh frequency depends on the choice of the driver chip. When a common driver chip is used, the refresh rate of full-color is 960hz, and that of single and dual color is 480HZ. When the dual latch driver chip is used, the refresh rate is above 1920hz. When high-definition high-order PWM driver chip is used, the refresh rate is above 3840hz.