The O stands for organic, which doesn’t mean much by itself. The main difference is that with OLED, it’s the tiny points that make up the picture all are like little lamps. So if the TV is displaying a picture, only the little lamps that are involved in showing something will be lit. The rest stays turned off and thereby properly black.
For (current) LED TVs the glowing points that you are seeing are like litte colourful windows and you need a bright light behind them to see them „glow“. The consequence is that on the one hand you can have very powerful lamps behind those coloured windows, which gives you a very bright picture, while on the other hand even the darkened windows will let through some light and they might look dark grey instead of completely black.
PS: this is how I would explain it to a five(!) year old. If you want buying advice and specs, I would try another sub…..not many 5 year olds to out buying OLED TVs.
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