The beauty of this approach is when a picture contains extremes of light and dark, the presence of a single light source (as in a conventional LCD) limits the extent to which you can recreate extremes of bright and shade, in other words contrast. Not so with LED TV.
It's possible to have LEDs switched off and others going at full tilt right next to each other on the same panel - a process called local dimming. This results in much deeper blacks and much brighter whites coexisting within a single frame. LED TV reviews continually refer to this significantly improved contrast ratio. As well as improved contrast, LED TVs also deliver better blacks, as you can simply turn off the LEDs when a scene from a film requires complete darkness. Magic.
Another approach to LED television sees the LEDs placed around the edge of the screen, with their light shining across the back of the screen until it's bounced out toward the viewer by an array of appropriately angled mirrors. This approach is favoured by the likes of Samsung LED TVs. This allows manufacturers to build incredibly slim housings making LED televisions outrageously thin. There are even claimed performance benefits.
And just to be clear, LED TVs are vastly different from the self-illuminating OLED TVs, which use pixel by pixel lighting.
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