Display device
AssigneeJapan Display Inc.
InventorKoji Yasukawa
Life of this patent
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Abstract
A display device including a pixel electrode, a counter electrode, and an organic layer arranged between the pixel electrode and the counter electrode, wherein the organic layer includes a hole injection layer in contact with the pixel electrode, a hole transport layer above the hole injection layer, a light emitting layer and an electron transport layer, the hole injection layer includes an inorganic material, and the inorganic material has a work function of 4.4 eV or less and includes one element or a plurality of elements selected from Na, Mg, K, Rb, Sr, Cs, Ba, Fr, Ca, Yb, Li, Al, Sm, Er and Ho, or a fluoride or an oxide of the elements.
Claims11
A display device comprising:
- a pixel electrode, a counter electrode, and an organic layer arranged between the pixel electrode and the counter electrode,
- wherein
- the organic layer includes a hole injection layer in contact with the pixel electrode, a hole transport layer above the hole injection layer, a light emitting layer and an electron transport layer;
- the hole injection layer includes an inorganic material;
- the inorganic material has a work function of 4.4 eV or less,
- a surface roughness of the pixel electrode is 20 nm or more, and a gap length between a projection and a depression of the surface of the pixel electrode is 40 nm or more, and
- a thickness of the hole injection layer is smaller than the surface roughness of the pixel electrode.
Dependencies are inferred from the claim text.