All Rights Reserved. This article, or any part thereof, may not be copied, reproduced, mirrored, distributed or incorporated. There have been lots of articles and discussions about how beautiful and stunning the OLED display on the Nexus One looks, but no one has yet done anything more than superficial eye ball commentary. This is not altogether surprising since OLED displays are at the leading edge of display technology — they are still under development and still being perfected as a production display for use in consumer products. The Nexus One display is distinctive and unusual in several respects: it is an Organic LED display, which is an emissive display technology, whereas most mobile devices have an LCD display, which uses a static backlight behind the panel. The screen is 3. Another unusual aspect of the Nexus One display is that it uses a PenTile pixel arrangement, where there are only two sub-pixels per pixel instead of the usual three, Red, Green and Blue, that are used in most display technologies. Every PenTile pixel includes a Green sub-pixel, but the Red and Blue sub-pixels appear in alternating pixels. But In practice, it makes things a lot harder for the software and makes it very likely that artifacts will creep into the on-screen images. None-the-less with the measurements and analytical test patterns we will learn quite a bit about how they work. Figure 1. Gallery Application: Lots of false contouring and image noise. The same as it looks on a studio monitor. Gallery and Browser Apps: Coarse steps and tinting on white. Fairly smooth and artifact free.