Looking back at past articles
"The vertical process can eliminate the problem of substrate sagging, which is the biggest problem of equipment enlargement, and when a plane source is applied, there is no movement of the substrate unlike the deposition technology that applies a linear source, so uniform deposition is possible even on a large area. There are also advantages."
-- quote from thelec.kr
Currently, it is expected that more materials will be used because it is not uniformly flattened in small and medium-sized OLED panels, and material use is expected to decrease (small) as the proficiency of the vertical deposition process increases.
In addition, among the contents I saw in the news, it is said that panel companies (SDC, LGD, Etc..) are trying to use as little as possible because the material of UDC is expensive and the rate of waste is quite high.
However, panel companies have no other alternative.