Samsung to unveil quantum dot curved monitor at IFA


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The South Korean tech giant is putting its curved display armed with quantum dots (QD) on its new gaming monitors to be unveiled at the upcoming IFA tradeshow.

They’re the first QD materials, or semiconductor nanocrystals, for Samsung to apply to monitors. The company has said previously that it wanted to expand QD use outside of TVs.

The CFG70 series has an 1800R curvature with a 1 m/s moving picture response time and a rapid refresh rate of up to 144Hz. It comes with the company’s own Gaming UX OSD interface, which provides an on-screen dashboard that allows users to configure settings.

Gameplay settings can be adjusted through hot keys at the front and the back of the monitor.

The larger CF791 has a curvature of 1500R, the most curved gaming monitor on the market. It has a refresh rate of 100Hz and has AMD FreeSync Technology that synchronizes the rate with AMD’s graphic cards. The monitor has a 21:9 ratio.

Samsung said the “boundless” design will allow gamers to focus on the screen, rather than the display.

“As the gaming market continues to enjoy rapid worldwide growth, gamers expect advanced display technologies that can bring out the latest video game features and optimize the gameplay experience,” said Seog-gi Kim, SVP of Samsung’s Visual Display Business, in a statement.

“By enhancing our pioneering curved gaming monitors with quantum dot technology, our CFG70 and CF791 displays further surround players and make them feel as if they are part of the game. We are excited to demonstrate this futuristic and immersive gaming environment at IFA 2016,” he added.

Samsung is reportedly working on applying curvable screens for future smartphones, and may use the technology to create a phone and tablet 2-in-1 device.

See Also: What Are Quantum Dots, and Why Do I Want Them in My TV?

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Printing Quantum Dot Displays: Electronics: A new printer uses electric fields to print quantum dots at high resolution for light-emitting diodes


Quantum Glow LED Print 1422381761226Researchers report a high-resolution method for printing quantum dots to make light-emitting diodes (Nano Lett. 2015, DOI: 10.1021/nl503779e). With further development, the technique could be used to print pixels for richly colored, low-power displays in cell phones and other electronic devices.

Quantum dots are appealing materials for displays because engineers can finely tune the light the semiconducting nanocrystals emit by controlling their dimensions.

Electronics makers already use quantum dots in some backlit displays on the market, in which red and green quantum dots convert blue light from a light-emitting diode (LED) into white light. Quantum dots also emit light in response to voltage changes, so researchers are looking into using them in red, green, and blue pixels in displays that wouldn’t need a backlight.

Quantum Glow LED Print 1422381761226

QUANTUM GLOW

With a new printing method, researchers created high-resolution patterns (left) and shapes (right) of red and green quantum dots, shown in these fluorescence images.
Credit: Nano Letters

Quantum dot LED displays should provide richer colors and use less power than the liquid-crystal displays (LCDs) used in many flat screens, which require filters and polarizers that reduce efficiency and limit color quality. But it’s not yet clear how quantum dot LED displays would be made commercially, says John A. Rogers, a materials scientist at the University of Illinois, Urbana-Champaign.

In 2011, researchers at Samsung made the first full-color quantum dot LED display by using a rubber stamp to pick up and transfer quantum dot inks (Nat. Photonics, DOI: 10.1038/nphoton.2011.12). As a manufacturing strategy, printing from ink nozzles would offer more flexibility to change designs on the fly, without the need for making new transfer stamps. Jet printing also would require less material, Rogers says.

Unfortunately, the resolution of conventional ink-jet printers, which use a heating element to force vapor droplets out of a nozzle, is limited. “It’s hard to get droplets smaller than about 25 µm,” Rogers says, because the smaller the nozzle diameter, the more pressure required to get the droplet out.

So for the past seven years, Rogers has been developing another method called electrohydrodynamic jet printing. This kind of printer works by pulling ink droplets out of the nozzle rather than pushing them, allowing for smaller droplets. An electric field at the nozzle opening causes ions to form on the meniscus of the ink droplet. The electric field pulls the ions forward, deforming the droplet into a conical shape. Then a tiny droplet shears off and lands on the printing surface. A computer program controls the printer by directing the movement of the substrate and varying the voltage at the nozzle to print a given pattern.

The Illinois researchers used this new method, including specialized quantum dot inks, to print lines on average about 500 nm wide. This allowed them to fabricate red and green quantum dot LEDs. They also showed they could carefully control the thickness of the printed film, which is difficult to do with stamp transfer and ink-jet printing methods.

The ultimate resolution possible with these kinds of printers is very high, says David J. Norris, a materials engineer at the Swiss Federal Institute of Technology (ETH), Zurich. Last year, Norris used a similar printing method to print spots containing as few as 10 quantum dots (Nano Lett. 2014, DOI: 10.1021/nl5026997). He says it’s even possible to place single quantum dots using electrohydrodynamic nozzles, albeit with less control and repeatability. Single-particle printing isn’t needed for making pixels for displays, but it is useful for studying other kinds of optical effects in quantum dots, he says.

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