Industry, sector and description for Universal Display. Universal Display researches, develops, and sells organic light emitting diode (OLED) technologies and materials for the flat-panel display industry.
The first requirement for all master horizons other than O horizons is that they are composed mostly of mineral material. It is very important to be able to differentiate organic from mineral material. Dark color of the A horizon is due to the mixing of humus with mineral.
1 500 â 5,000 years: The A horizon has stabilized and is fairly thick and dark for this soil. 2  High productivity and lots of biotic activity continually recycle the organic matter. 3  The original minerals in the soil begin to weather and form new clay minerals.