I think its because the LEDs are much bigger than LCD pixels. Basically the backlight would affect a whole group of pixels, which generally is what you would want. I havent looked at one of these in person, but i would imagine around the edge of a high contrast change you would see a more normal LCD black instead of true black like the rest of the image.
This individual colour LEDs seems to take it even further - allowing a RED to be more RED by simply not having any blue or green in the backlight, but again, it can only do this over a small area instead of per pixel.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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I think its because the LEDs are much bigger than LCD pixels. Basically the backlight would affect a whole group of pixels, which generally is what you would want. I havent looked at one of these in person, but i would imagine around the edge of a high contrast change you would see a more normal LCD black instead of true black like the rest of the image.
This individual colour LEDs seems to take it even further - allowing a RED to be more RED by simply not having any blue or green in the backlight, but again, it can only do this over a small area instead of per pixel.