One of the interesting papers that was presented at the SID (37.2 Plane Source Evaporation Techniques for Super Ultra High Resolution Flexible AMOLED) was given by Oledon. In the paper, the Korean company, working with Dankook University and Daejin University, has developed a shadow mask technology that can deposit OLED materials with enough accuracy to create AMOLEDs that can support 2250 ppi operation, with an eventual ppi resolution of 3,300 ppi.
The technique used is to use a ‘plane source’ technology rather than a point or linear source, as previously used. The idea is that a linear source is used to deposit material onto a plane source. The point and linear source techniques give a shadow or ‘halo’ around the dot of OLED material because of the angles at which the OLED material goes through the mask. By going through the mask more at right angles to the sheet, the halo effect is minimised and keeps the dots smaller.
Analyst Comment
Oledon is not the only company working on this. Sunic has a technology for doing this that we have previously reported on. (Samsung Pushed Resolution at MWC) Sunic also uses a plane source. Samsung showed an LCD with 2,250 ppi at the recent SID and this kind of display is widely seen as being needed to deliver compelling image quality for VR. (BR)
