Hz

Hertz is a unit of frequency equal to the frequency of a cyclic event vibrating once per second. German physicist Heinrich Rudolf Hertz discovered this concept during his work on radio waves. On screens such as televisions and monitors, it means the number of frames per second, that is, the refresh rate. If we give a good example of this, a 50 Hz screen can project 50 frames per second to the screen.

Sometimes a low Hertz television will show the same broadcast much better than another high Hertz television. Normal tube televisions broadcast at 50 Hz. On LCD screens, it is over 50. Today, 600Hz has come up with 3D TVs. An image frame projected onto the screen on 50 Hz televisions is actually created by overlapping 2 half images.

The image on the screen is projected by scanning line by line. The odd-numbered lines (1, 3, 5, 7, 9 ) of the lines that make up the image are scanned in the first frame, and then the even-numbered lines are scanned in the second frame. Because these two half-scan screens change fast enough and because of the phosphorescent feature of the screen, it seems as if a single frame is projected to us, this is called an interlaced image.

No matter how high quality the transition of two half-frames is on 50 Hz televisions, when the screen sizes start to grow, it is perceived as vibration or fluctuation by the viewer. While the screen size is small on 50 Hz TVs, the flicker on the screen is not very disturbing, but it becomes apparent on sizes above 70 screens and starts to be disturbing on 80 screens.

Since the image on the screen is created by scanning at once in 100 Hz TVs, the screen does not flicker. In cases where the screen size is over 80 screens, 100 Hz of the television means a clearer image for the audience.

To learn more about ratios;

https://cinema8.com/blog/choosing-the-ideal-aspect-ratio-for-your-video