Some newer Sony TVs have a built-in feature called "Motionflow" by Sony. This is Sony's implementation of Motion Smoothing and may cause the image of your TV to become smoother.
What is Motionflow anyway? Increase the frame rate of the content you see. The refresh rate on your display (typically 60 Hz or 1
20 Hz) is often much higher than the frame rate of movies or TVs (usually 24 frames per second or 30 frames per second). So if you increase the frame rate, the high refresh rate of your TV will be used optimally.
This is done by guessing the missing images and inserting them between the real images. However, this often looks blurry because it is difficult to get the intermediate images right. High frame rates will not look good for most of the content you see on your TV, resulting in a strange "soap opera effect" that makes your movies look hyperrealistic.
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Your TV may vary, but most Sony TVs hide the setting in the "Picture" settings menu. Here you can set different levels for Motionflow.
You should select "Off" if you want to disable them completely. For some TVs, it can be hidden under an additional Advanced Settings tab. For Sony Android TVs, you can disable Motionflow only by activating the game mode of the TV (Motionflow adds a lot of input delay and should be disabled for games.)
Sony seems to change their menus every year, and they vary depending on if you are in the future have a problem finding the option, consult the manual of your TV that you can find online.