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.
The O horizon is thin in some soils, thick in others, and not present at all in others. A - (topsoil) Mostly minerals from parent material with organic matter incorporated. A good material for plants and other organisms to live.