Shedding Light on LEDs (Part 4): LED RGB

We explained what light-emitting diodes are (see here) and described Edge LED (see here) and Local Dimming (see here). In both cases, these are white LEDs. Another way to use LEDs in a flat screen TV is to use coloured LEDs. Red, green and blue are in the spotlight.

Instead of having only white LEDs, RGB full matrix technology consists of combining diodes together: red, green and blue. The combination of the three creates the required white light for backlight. The display plate is full of diodes grouped into hundreds of trios.

As with Local Dimming, it is possible to directly adjust the level of each LED, which leads to great contrasts. The ability to independently adjust the red, blue or green gives a more accurate colorimetry. The only problem with this technology? The price.

When it comes to adjusting the colour temperature, it can be done by way of this variable white light emanating from the red, green and blue diodes. All this allows for tones that are more realistic and better defined.

RGB LED has the same advantages as LED white with Local Dimming, but with a wider colour spectrum.

Toshiba offers this type of technology in the SV series models and two Sharp models in the XS series are equipped with LED RGB backlight (52 and 65-inch versions).

Next article: In conclusion, the future of LCD LED.

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