ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,538,636, issued on Jan. 27, was assigned to Sharp K.K. (Sakai, Japan).
"Light-emitting element and display device" was invented by Hiroshi Tsuchiya (Sakai, Japan) and Masanobu Mizusaki (Sakai, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A light-emitting element includes an anode electrode and a cathode electrode, and is provided with a first hole transport layer, a second hole transport layer, a light-emitting layer, a first electron transport layer, and a second electron transport layer. At a HOMO level, an energy level difference between the second hole transport layer and the light-emitting layer on the second hole transport layer side is fr...