The bigger, the better" is the usual thought when it comes to TV screen size.  As a general rule, the right LED TV should be large enough to fill your field of view for an immersive viewing experience, but not too close that you end up straining your eyes.

An easy way to identify the ideal size is to choose a TV with a screen size that's at least a third the viewing distance (in inches). For instance, 40-inch TVs work well in rooms where the viewing distance is between 5.5 and 10 feet, and 50-inch LED TVs have an optimal viewing range of 6 to 10.5 feet. Larger 55-inch TVs are a suitable pick if the viewing distance is between 7 and 12.5 feet, while LED TVs measuring 60 inches and above work best with a viewing distance of 8 to 15 feet.