And I wonder ... why ?? Samsung Display has started working on a mobile phone display that is over four times sharper than today's highest-resolution (quad-HD) displays. 

The new display would have a pixel density of 2,250 ppi (pixels per inch), compared to just over 500 ppi for today's quad-HD displays.

By another measurement, if quad-HD qualifies ad '2K', this new display would be '11K' resolution, with far more pixels than today's 4K UHD televisions. Samsung claims this sharpness would enable a 3D effect without glasses. The company hopes to have a prototype ready by early 2018. If used in VR applications - such as a phone paired with Samsung's Gear VR accessory - such a display would dramatically improve visible resolution. The lenses in VR goggles magnify the display such that pixels are clearly visible even with today's best quad-HD displays. Samsung displays are also used in Oculus Rift VR goggles.

This business is part of GiGA Korea’s business that is being led by Ministry of Science, ICT, and Future Planning (MSIP), and name of the project is EnDK. It is predicted that prototype can be shown to the public at 2018 Pyeongchang Winter Olympics at the earliest.

As a main company that is overseeing the project, Samsung Display is aiming for a goal that allows 2250 ppi-level 11K display for mobiles to implement 3D-effect. If display panel’s resolution increases extremely, there is an optical illusion where it is same as watching 3D screen. Because 11K is able to show screen colors in detail, it is able to show 3D-effect.
Currently 500 ppi-level 2K (2560x1440) display product is being released as one with the best specification in mobile display field. A prototype with 8K resolution came out in large-sized display for TVs field, and most of UHD 4K products are considered as the ones with best resolution.
“We are hoping that we are able to show such technologies at Pyeongchang Olympics if there is a progress in developing technologies. Although some might think that 11K as ‘over specification’ that consumers do not need, this can work as a basis for Korean display industry take another leap if related materials and parts improve through this.” Executive Director Chu stressed the importance of this technology for the future.