ALEXANDRIA, Va., June 2 -- United States Patent no. 12,648,348, issued on June 2, was assigned to Samsung Display Co. Ltd. (Yongin-si, South Korea).

"Light-emitting device and display apparatus including the same" was invented by Heungsu Park (Anyang-si, South Korea), Songeun Lee (Hwaseong-si, South Korea), Namsu Kang (Seoul, South Korea), Jongwon Lee (Yongin-si, South Korea) and Hyunshik Lee (Seoul, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "A light-emitting device including a first electrode, a hole transport region disposed on the first electrode, a first light-emitting layer disposed on the hole transport region and emitting light of a first wavelength, a second light-emitting layer dispo...