Chinese display maker BOE technology has achieved yet another milestone in LCD technology with the unveiling of a 55-inch 4K active-matrix Quantum Dot light-emitting diode (AMQLED) display. Officially, this is another major progress in the field of BOE electroluminescent quantum dots.

According to the official introduction (via), the 55-inch 4K AMQLED display product launched by BOE this time adopts electroluminescent quantum dot technology and has a resolution of 3840×2160 pixels, a colour gamut of up to 119% NTSC, and a contrast ratio of 1000000:1, which is broad in the field of large-size displays.

At present, the applications of Quantum Dot technology in display products mainly include photoluminescence Quantum Dot backlight technology and active electroluminescence quantum dot diode technology (AMQLED). Different from the photoluminescence quantum dot backlight technology, AMQLED displays do not need a backlight, and the quantum dots can emit light by injecting current. It has the advantages of self-luminescence, wide colour gamut, and long life, which has become the development direction of quantum dot displays.

In case you don’t know, quantum-dot televisions are a new type of LED-backlit LCD TV. The image is created just like it is on an LCD screen, but quantum-dot technology enhances the colour. The backlight system on an LCD TV is a bank of LEDs mounted at the edge of the screen or immediately behind it. That light is diffused, directed by a light-guide plate and beamed through a polarizing filter. The photons then hit a layer of liquid crystals that either blocks the light or allow it to pass through a second polarized filter.

The light passes through a layer of before it meets the second polarizer, light passes through a layer of red, blue, and green (and sometimes yellow) colour filters. These are the subpixels. Electrical charges applied to the subpixels moderate the blend of coloured light visible on the other side. This light cocktail creates the colour value of each pixel on the screen.

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