Electroluminescent display device

An electroluminescent display device, comprising: a substrate 111 which may include an active area AA and a non-active area NA, the active area AA having an emission area A; a planarization layer 115e,115f disposed on the substrate 111; a light emitting element 130 disposed on the planarization layer 115e,115f; a buffer layer 140 disposed on the light emitting element 130 and having a plurality of holes 145 in a surface thereof; and a hydrogen trap layer 150 disposed on the buffer layer 140. The electroluminescent display device may comprise an oxide thin film transistor 120. The hydrogen trap 140 layer may comprise aluminium and may have a series of grooves formed in the surface thereof corresponding to the holes 145.