Display device
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United States of America Patent
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Nov 19, 2019
Grant Date -
Feb 14, 2019
app pub date -
Jul 27, 2018
filing date -
Aug 14, 2017
priority date (Note) -
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status (Latency Note)
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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.
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