low-resolution
adjective /ˌləʊ rezəˈluːʃn/
  /ˌləʊ rezəˈluːʃn/
(also informal lo-res, low-res)
- (of a photograph or an image on a computer or television screen) not showing a lot of clear detail- a low-resolution scan
 Oxford Collocations DictionaryLow-resolution is used with these nouns:- display