In　recent　years,　OLED(Organic　Light　Emitting　Diode)　devices　have　been　widely　used　in　small-and　medium-sized　displays,　and　have　gradually　been　popularized　in　large　area　display　applications,　such　as　in　TVs　and　lighting.　With　the　continuous　development　of　organic　light-emitting　technology,　higher　requirements　drive　research　on　the　color　and　pattern　of　OLED　devices.　Compared　with　the　traditional　vacuum　evaporation　process,　inkjet　printing　technology　easily　colors　large-area　devices　and　patterns　composite　functional　materials.　It　is　also　simple　to　implement,　low　in　cost　and　has　a　more　flexible　process.　In　this　paper,　the　current　progress　of　inkjet-printed　OLED　devices　is　reviewed.　Furthermore,　this　paper　systematically　introduces　the　development　of　inkjet　printing　equipment,　by　optimizing　bank　structures　to　improve　the　resolution　of　their　display　screens,　by　optimizing　the　ink　formulation　and　composition　ratio　to　suppress　the　coffee　ring　effect　of　inkjet　droplets,　and　improves　the　uniformity　of　display　luminescence.　Finally,　this　paper　summarizes　and　provides　prospects　for　the　future　development　of　this　technology　at　home　and　abroad.　©　2020,　China　Science　Publishing　&　Media　LTD.　All　right　reserved.