US 11,864,402 B2
Combined auxiliary electrode and partially scattering bank for three-dimensional QLED pixel
Hywel Hopkin, Oxford (GB)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Apr. 30, 2021, as Appl. No. 17/245,366.
Prior Publication US 2022/0352480 A1, Nov. 3, 2022
Int. Cl. H10K 50/11 (2023.01); H10K 50/115 (2023.01); H10K 50/854 (2023.01); H10K 59/122 (2023.01)
CPC H10K 50/115 (2023.02) [H10K 50/854 (2023.02); H10K 59/122 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A top emitting quantum dot light emitting diode (QLED) apparatus for an emissive display apparatus including a sub-pixel, with at least one bank defining an emissive region of the sub-pixel, the top emitting QLED apparatus comprising:
an emissive layer deposited in the emissive region between a first electrode and a second electrode, wherein:
the first electrode comprises a reflective metal;
the second electrode comprises a transparent conductive electrode and an auxiliary electrode;
the at least one bank comprises a sloped portion adjacent the emissive region;
the auxiliary electrode comprises a reflective conductive metal and is configured to cover the sloped portion;
the sloped portion is configured at an angle, such that the auxiliary electrode reflects internally reflected light out of the sub-pixel in a viewing direction;
the auxiliary electrode is further configured with a partially light scattering surface to broaden a reflective angle range of the auxiliary electrode; and
the transparent conductive electrode comprises nanoparticles measuring between 20 nm and 100 nm thereby imparting an optically rough surface to the auxiliary electrode for scattering light.