noun
exhibition of original artwork
Refers to an exhibition displaying original drawings, paintings, or production materials, often for anime, manga, or illustrations.
来月、有名漫画家の原画展が開催される。
An exhibition of original artwork by a famous manga artist will be held next month.
展示会 is a general exhibition or trade show, while 原画展 specifically features original artwork.
Compound of 原画 (original picture) and 展 (exhibition).