Graphene-based interferometric displays could reach 12K at 2500ppi

By eeNews Europe

A team of High tech Companies and research institutes (SCALE Nanotech (Estonia), the Kavli Institute of Nanoscience (the Netherlands) and Graphenea (Spain)) developed a graphene interferometric modulator, A graphene modulator display. 

Interferometric displays (IMODs) are a technology on the rise for displays that have low power consumption and high performance in bright environments, properties that are well-aligned with the demands of modern portable devices. IMODs made of other materials suffer from low frame rates and limited color gamut, which has hindered their use. Now, graphene IMODs are shown to operate at up to 400 Hz, cover the full visible spectrum with reduced flicker effect. The demonstrated GIMOD prototype has 2500 pixels per inch, equivalent to more than 12K resolution. The current highest ultra-high definition television (UHDTV) resolution in digital television and digital cinematography is 8K.

The GIMODs are produced from two layers of graphene. The double-layer graphene (DLG) is then transferred to a substrate that houses the array of holes that forms the basis of GIMOD. This results in an optical cavity with a movable absorbing membrane made out of DLG and a fixed mirror formed by the underlying silicon surface. The silicon substrate also plays the role of back electrode for electrostatic actuation – controlled deflection of the membrane. The spacing between the membrane and the back electrode gives the color that is reflected back to the observer. Since each pixel is contacted independently, GIMOD can produce a color matrix with resolution that is well above what the eye can discern. 

The technology was earlier demonstrated at the Graphene Flagship booth at the Mobile World Congress 2017. The link will bring you to the video report of this show and also the first demo of the GIMOD.

The link to the video

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