Quantum Dot Display Technology
OLED TVs may have stolen the show at CES 2012, but just when you think it’s safe to be an early adopter and pick one up, you might want to hold off. There’s a new display technology on the horizon that backers claim will not only outperform OLED, but also be cheaper to manufacture. And it has a much cooler name – it’s called Quantum Dot display or QLED. And if that doesn’t sound like you’re living in the future, we don’t know what does.
Typically the chemical composition of a material determines the color of light it will produce, whether you’re talking about CRT, LCD, LED or Plasma. But scientist have found that size matters as well. When you’re dealing with very, very small semiconductors, less than 10 nanometers, their size can actually determine what color they produce. The tiny semiconductors are called Quantum Dots and by varying the size of the dot, you can actually produce different wavelengths of light.
Quantum dot light emitting diode (or QLED) technology is being pioneered by Massachusetts company QD Vision, a spin-off from the Massachusetts Institute of Technology. Together with technology partners such as LG, QD Vision is trying to pioneer the new technology they claim will surpass OLED in price, performance, quality and power consumption. They claim their QLEDs will be “a reliable, energy efficient, tunable color solution for displays and lighting that is less costly to manufacture [than inorganic LEDs] and that can employ ultra-thin, transparent or flexible substrates.”
How it Works
A quantum dot made from Cadmium selenide will produce light in the red region of spectrum from a 5 nm diameter dot and the violet region from a 1.5 nm dot, and anywhere in between. The energy that determines the color of the fluorescent light produced is inversely proportional to the square of the size of dot. In other words, the emitted light changes as the dot size changes. By producing dots of varying sizes on a single substrate, a manufacturer can create any wavelength of light they want. QLEDs can be tuned over the entire visible spectrum, from 460 nm (blue) to 650 nm (red).
Pros and Cons
Wikipedia has a great collection of Pros and Cons for the emerging technology:
Other advantages include better saturated green, manufacture ability on polymers, thin display, same material used to generate difference colors, and higher resolution.
Commercialization of quantum dot display is yet to come. Compared to LCD and OLED, the manufacturing cost of QD-LED is relatively high and development of novel and more cost-efficient fabrication process is desired in future.
Posted by The HT Guys, May 17, 2012 9:47 PM
About The HT GuysThe HT Guys, Ara Derderian and Braden Russell, are Engineers who formerly worked for the Advanced Digital Systems Group (ADSG) of Sony Pictures Entertainment. ADSG was the R&D unit of the sound department producing products for movie theaters and movie studios.
Two of the products they worked on include the DCP-1000 and DADR-5000. The DCP is a digital cinema processor used in movie theaters around the world. The DADR-5000 is a disk-based audio dubber used on Hollywood sound stages.
ADSG was awarded a Technical Academy Award by the Academy of Motion Picture Arts and Sciences in 2000 for the development of the DADR-5000. Ara holds three patents for his development work in Digital Cinema and Digital Audio Recording.
Every week they put together a podcast about High Definition TV and Home Theater. Each episode brings news from the A/V world, helpful product reviews and insights and help in demystifying and simplifying HDTV and home theater.