The present invention relates to a
display device comprisinga plurality of
OLED pixels comprising at least two
OLED pixels, the
OLED pixels comprising an
anode, a
cathode, and a stack of organic
layers, wherein the stack of organic layersis arranged between and in contact with the
cathode and the
anode, andcomprises a first
electron transport layer, a first
hole transport layer, and a
first light emitting layer provided between the first
hole transport layer and the first
electron transport layer, anda
driving circuit configured to separately driving the pixels of the plurality of OLED pixels,wherein, for the plurality of OLED pixels, the first
hole transport layer is provided in the stack of organic
layers as a common hole
transport layer shared by the plurality of OLED pixels, and the first hole transport layer comprises(i) at least one first hole transport matrix compound consisting of covalently bound atoms and(ii) at least one electrical p-
dopant selected from
metal salts and from electrically neutral
metal complexes comprising a
metal cation and at least one anion and / or at least one anionic ligand consisting of at least 4 covalently bound atoms,wherein the metal cation of the electrical p-
dopant is selected from alkali metals; alkaline earth metals, Pb, Mn, Fe, Co, Ni, Zn, Cd;
rare earth metals in
oxidation state (II) or (III); Al, Ga, In; and from Sn, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W in
oxidation state (IV) or less, a method for preparing the
display device and a
chemical compound for use therein.