Large quantum-dot films in backlights must allow some of the LEDs’ blue light to pass through the film so it can be combined with the red and green light from the quantum dots. However, in a CFR scenario, the quantum-dot subpixels must absorb virtually all the blue light so their color is very pure with no blue component.
The image at the top of this article is a photomicrograph of an inkjet-printed CFR array with complete pixels measuring about 300×300 microns, which is roughly equivalent to the pixel density of a 50″ UHD TV. The blue subpixels are essentially clear, allowing the blue light from the LED backlight to pass through. They do have some scattering materials so the blue light scatters in much the same way as the red and green light from the QDs.
Color-filter replacement (CFR), also known as color conversion, offers many benefits. Among them is greater power efficiency, which translates to as much as 300% higher brightness. Other benefits include a wider color gamut and 180-degree viewing angle.
Inkjet-printed quantum dots will also hasten the development of electro-emissive QD displays, in which quantum-dot subpixels emit light directly under electrical stimulation—no backlight needed.
Nanosys and DIC Announce Inkjet-Printed Quantum-Dot Process - AVSForum.com
