ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,040, issued on Nov. 25, was assigned to Beijing BOE Technology Development Co. Ltd. (Beijing).
"Display substrate and display apparatus" was invented by Lei Chen (Beijing).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided are a display substrate and a display apparatus. The display substrate includes a drive circuit layer and a light emitting structure layer stacked on a substrate. The light emitting structure layer includes an anode, a cathode, and an emitting layer, a hole block layer, and an electron transport layer disposed between the anode and the cathode; the hole block layer and the electron transport layer satisfy: EETL/EHBLless than1;...