In TVs, despite the many invented parameters that have a value of 200 and up to 2000 units, there is one parameter that really stipulates the capabilities of the TV and this parameter is the frame rate on the TV screen (Refresh Rate).
Refresh Rate – This parameter shows how often the TV changes the frames on the screen.
But there is a nuance about which TV manufacturers are not very fond of saying, namely, that there is no content with a frequency of more than 60Hz. All video standards specify the maximum recording frequency, at 60Hz. A person will not see a special difference between video at a frame rate of 50Hz and 100Hz. Therefore, standards are not being developed with an increased frame rate.
HDMI port standards until 2017 supported the maximum video frequency at 60Hz.
But if there is a video with a frequency of 60Hz, then how will it show the TV with a frame rate of 50 per second. Everything is very simple, it will show quite normal, all TVs are designed to display video with a frequency of 60Hz.
On the European continent, at one time, the AC standard was adopted in the electrical network at 50Hz, and in the US 60Hz, the first analogue kinescope TVs used the network frequency to synchronize the image, because it is stable and maintained strictly within a limited range. The time has passed, modern TVs have not used the network frequency for image synchronization for a long time, but the notion of 50Hz for Europe and 60Hz for the US has so deeply penetrated the minds of users that manufacturers continue to use these parameters to denote the frame rate in the TV.
A modern TV will show an image at any frequency up to 60Hz, but the screen matrices have their own parameters, specifying the Refresh Rate parameter at 60 (50) Hz. the manufacturer guarantees the quality of the picture at the proper level.
But you say, if there is no video with a frame rate of more than 60, then why release TVs in which the support of 100 (120) Hz is claimed.
And this is a reserve for the future since 2017, a new standard of HDMI ports 2.1 has been adopted in which the support for video with a frequency of 120Hz has already been agreed. And this makes it possible to use the TV as a monitor.
Note: in some models of TVs there are modes of increasing the frame rate, which allow creating additional image frames, but as the practice of using TVs has shown, 98% of users do not include these modes because of their uselessness.
Conclusion: Buying a TV with frequency support at 100 (120) Hz. you will get a TV with a better matrix, which will positively affect the quality of the picture.