The recent PR was very good if you understand the technical aspects they had to overcome to achieve it.

Quantum dots on-chip
This is where quantum dots would replace phosphor technology. Existing LEDs have a phosphor mixed in with silicon on top of the blue LED, converting it to the white light. Replacing the phosphor material with QDs would mean directly converting that blue light to pure reds and greens instead.

Quantum dots on LED chips is an even greater technical challenge than quantum dot color filters because of the high temperature, high light flux, and oxygen that the quantum dots would be exposed to, causing their rapid degradation. Because of this, quantum dots need to be specifically engineered to survive in this environment.

Although the technology has been commercialized for mid-power LED lighting, there are currently no quantum dot materials that can survive high-power LED packages. Researchers are still working on overcoming the on-chip challenge for displays.

It's possible that the use of quantum dots on LED chips won't be achieved because using quantum dots in color filters will become commercialized faster. If color filters are successful, some benefits would be lost if the technology returned to the back of the screen.

Both technologies have benefits and are being actively researched so we will see demos of both in the coming years at display conferences. However, it's still unclear whether either technology will mature enough to be implemented in consumer displays

https://pid.samsungdisplay.com/en/learning-ce...technology

http://palomakiconsulting.com/quantum-dots-on...ct-launch/