Why does the led flash when shooting with a mobile phone?

The flashing stage of the screen. What we see on the screen is a flash of wisdom, but people's eyes can't tell qing dao from a knife. However, if you take photos with your mobile phone, the two screens will flash at the same time, which will enhance the flashing effect. If the frequency is different, it won't flash.

This is the most basic photographic phenomenon.

The reason is that the screen refresh frequency is 60hz, that is, the screen is changed every 1/60 seconds. Because of the physiological function of visual maintenance, it is impossible for the naked eye to distinguish, and the exposure time of mobile phones and general low-function cameras is1125 seconds, so the picture change process that is invisible to the naked eye is often captured.

Professional photographers usually increase the exposure time of the camera to solve this problem, but for beginners, this often requires mandatory stabilization measures.

Improving the refresh rate of display screen can also help solve this problem, but the refresh rate of LED LCD screen is not much higher, generally 60-70 Hz.

Extended data:

In short, it is the ability to display a panel that "refreshes" a new image. The refresh rate is in hertz and is indicated by the number before it (for example, 60hz). The 60 panels here can display 60 new images per second, and so on. With the increase of this number, the number of images displayed per second will also increase, thus making the images smoother. Modern smartphones use higher refresh rates, such as 90Hz and 120Hz, to provide a smoother experience.

A smooth screen will produce a faster device effect because the response speed of the display is faster. The video looks smoother, scrolls and slides, but it also means a higher battery, and not all food can look good at a higher refresh rate. For example, movies and TV programs usually have 24 frames per second. If you have a 90 hz, 120 hz panel, it is ugly and looks like a soap opera, so this problem is called "soap opera" effect.

In order to solve this problem, the refresh rate of smart phone is variable, which means it can change the refresh rate according to the content and power consumption. Another advantage of high refresh rate is dynamic blur. A higher refresh rate makes the motion in the image look clearer rather than blurred.