Developed by Samsung et al., A new OLED technology with over 10,000 PPI

 Developed by Samsung et al., A new OLED technology with over 10,000 PPI

When using a VR headset, some people may occasionally be concerned about the mesh and pixel feel between the pixels of the display. Samsung and Stanford University are jointly developing OLED technology capable of densification of 10,000 PPI or more.

Currently, products that use OLED are mainly divided into two types, one for smartphones and the other for large TVs. The OLED display for smartphones is a type that emits three OLEDs with red, green, and blue colors, and is characterized by high color reproducibility and easy miniaturization, but most of them are still 500 PPI or less.

On the other hand, the one for large TVs is a type that is used as a white OLED backlight and uses a color filter to add color. While high contrast can be achieved, the efficiency of light utilization through the filter is reduced. Also, if the same screen is displayed for a long time, the screen may be burnt.

A new OLED technology being developed by Samsung and Stanford University places a film with OLEDs between two reflective layers. The reflective layer forms a “metasurface” with a thin film of silver on one side and innumerable nano-sized irregularities on the other side, and changes the wavelength of the reflected light according to the arrangement interval of the protrusions called nanopillars to generate each RGB color. Play a role.

With this method, it is possible to realize a display that has both the pixel density of over 10,000 PPI, which is much higher than OLED for smartphones, and the brightness of OLED for large screens. Samsung researchers have stated that “theoretical scaling limit obtained from simulation results is estimated to be 20,000 PPI” in this method (however, when miniaturization reduces pixels to 1 μm or less, pixel-by-pixel brightness There is a problem that weakens).

And now, the most ideal device for this high pixel density display is the display for VR headsets. With a pixel density of 10,000 PPI, the mesh is probably invisible to the human eye. Of course, if you want to make an ultra-high resolution image that matches an ultra-high resolution VR display, you will need a fairly high-performance computer, so you will probably not be able to make pixel-perfect images for more than a few years, but this With the spread of new OLED technology, the image quality problem of VR headsets will be solved.

Companies other than Samsung are also developing displays with a pixel density of 10,000 PPI or higher. For example, JBD (Jade Bird Display) and Vue Real in Canada are said to be developing displays with 10,000 to 30,000 PPI using micro LED technology.

At least in the field of VR, in the not too distant future (as long as the graphic performance of the display device improves), it seems that we will be able to get rid of the noticeable pixel feeling.

Trelawney Ross