You must be aware of TFTs, OLEDs, FHDs, QHDs. These are the normal displays you find on any phone. However, quantum displays are much better to view because of a couple of reasons. US Patent and Trademark Office published another patent application on Quantum Dot Spacing for High-Efficiency Quantum Dot Displays.
Quantum dots are semiconductor materials which are sized only a couple of nanometers in size. Their tiny size enables their optical and electronic properties to differ from each other.
Quantum dot displays offer much better power efficiency as compared to OLED. When electricity is applied on these dots, they emit light of a particular frequency. When the size of the dots is changed, the frequency can also be altered. Smaller quantum dots emit higher energy i.e. bluish lights and larger quantum dots emit lower energy i.e. redder lights.
The first picture below is the pictorial image of Apple’s Patent cross-sectional view of Quantum Dots. It has a core (blue colour), the shell (yellow colour) and a coating of organic or inorganic ligands bound to the shell.
The second picture is a mixture of quantum dots combined with metal oxide coating and quantum dots with ligands. You can see it in Fig. 6 below.
Apple’s invention is clearly related to Quantum dots layer and Quantum Dots display structures.
If you look at the image above, you can see that a layer of 300 Quantum Dots in placed inside a layer of 500 Quantum Dots. This mixture might create carrier trap sites which trap the charge emitted by electrons. This enhances the Quantum Dots excitation of the device.
The metal oxide coating on the Quantum Dots creates a charge transporting matrix. This increases the recombination zone, which in turn increases the device efficiency as well as longitivity of the device.
As interesting and useful as this sounds, this is just a patent that has been filed by Apple. Any clue when it may hit the markets?
Featured Image Source, News Source: Patently Apple