That might not sound like it would make a radical difference in terms of picture quality, but in reality it ends up affecting almost every aspect of performance. First and foremost, the mini-LEDs allow the Samsung TV to achieve much higher brightness, which we can express in terms of nits (a common shorthand for candelas per square meter). During HDR playback, the Samsung TV can reach roughly 2,000 nits of brightness, while the TCL TV is limited to just under 700 nits. (For reference, the most recent iPhone models can achieve 1,200 nits in HDR.) This means the Samsung TV is better able to portray the brightest highlights in 4K Ultra HD video as they are supposed to look, while the TCL TV has to tone down those highlights to fit them within its brightness capabilities.
