US 11,839,093 B2
Image rendering in organic light emitting diode (OLED) displays, apparatuses, systems, and methods
Boryeu Tsaur, Foster City, CA (US); and Hong K Choi, Sharon, MA (US)
Assigned to KOPIN CORPORATION, Westborough, MA (US)
Filed by KOPIN CORPORATION, Westborough, MA (US)
Filed on May 13, 2020, as Appl. No. 15/931,462.
Claims priority of provisional application 62/911,905, filed on Oct. 7, 2019.
Claims priority of provisional application 62/847,856, filed on May 14, 2019.
Prior Publication US 2020/0388658 A1, Dec. 10, 2020
Int. Cl. H10K 59/122 (2023.01); H10K 50/858 (2023.01); H10K 59/32 (2023.01); H10K 71/00 (2023.01); H10K 50/818 (2023.01); H10K 59/38 (2023.01)
CPC H10K 59/122 (2023.02) [H10K 50/858 (2023.02); H10K 59/32 (2023.02); H10K 71/00 (2023.02); H10K 50/818 (2023.02); H10K 59/38 (2023.02)] 44 Claims
OG exemplary drawing
 
1. An organic light emitting diode (OLED) display apparatus, comprising:
an OLED device, the OLED device is formed with a first light emitting OLED stack, a charge generating layer (CGL), a second OLED stack, and a color filter, the OLED device further comprising:
three sub-pixels, each sub-pixel has a separate anode, the three sub-pixels share a common cathode, the common cathode further comprising:
a first layer, the first layer is a thin layer made of metal; and
a second layer, the second layer is a thicker layer made from a transparent oxide, the common cathode has a lower surface that is closer to the separate anode and an upper surface that is further from the separate anode, the separate anode has a perimeter; and
a dielectric barrier, the dielectric barrier is disposed between the separate anodes and around a perimeter of each separate anode of the three sub-pixels, the dielectric barrier extends above the separate anodes of the three sub-pixels into both of the first OLED stack and the second OLED stack, the dielectric barrier has a maximum height above the separate anode that is less than a minimum height of the upper surface of the common cathode located over the separate anode, thereby causing the CGL to have an undulating shape, such that in operation, when current flows to a desired sub-pixel of the three sub-pixels, lateral current flow through the CGL to adjacent sub-pixels is impeded, resulting in light generation by the desired sub-pixel and reduction in unwanted light generation at sub-pixels adjacent to the desired sub-pixel.