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.
And it actually is thicker near the cir-cumference of the moon; I do not mean in an absolute sense, but relatively to the rays of our vision, which cut itobliquely there. Thus it may obstruct our vision, especially when it is lighted, and cloak the lunar periphery that isexposed to the sun.