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.
O Horizon. 1  A mixture of weathered rock and organic material that covers tâ¦. 2  A cross-section of soil showing different layers. 3  A layer of soil that differs in color and texture from the layâ¦. 4  Top organic layer of the soil made up of humus (dead plants anâ¦. 5  A mixture of weathered rock and organic material that covers tâ¦.