The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 2021
Filed:
Nov. 20, 2019
Lg Display Co., Ltd., Seoul, KR;
LG DISPLAY CO., LTD., Seoul, KR;
Abstract
A quantum dot light emitting diode comprises first and second electrodes facing each other; a hole injection layer disposed between the first electrode and the second electrode and having a first HOMO level; a first hole transporting layer disposed between the hole injection layer and the second electrode and having a second HOMO level that is lower than the first HOMO level; a second hole transporting layer disposed between the first hole transporting layer and the second electrode and having a third HOMO level that is lower than the second HOMO level; and a quantum dot light emitting layer disposed between the second hole transporting layer and the second electrode and having a fourth HOMO level that is lower than the third HOMO level, wherein a difference between the first HOMO level and the second HOMO level is greater than a difference between the second HOMO level and the third HOMO level and less than a difference between the third HOMO level and the fourth HOMO level.