US 12,272,682 B2
Systems and methods for multi-color LED pixel unit
Qiming Li, Albuquerque, NM (US); Qunchao Xu, Shanghai (CN); and Huiwen Xu, Shanghai (CN)
Assigned to JADE BIRD DISPLAY (SHANGHAI) LIMITED, Shanghai (CN)
Appl. No. 17/620,661
Filed by Jade Bird Display (Shanghai) Limited, Shanghai (CN); and Qiming Li, Albuquerque, NM (US)
PCT Filed Jun. 19, 2020, PCT No. PCT/US2020/038785
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2020/257680, PCT Pub. Date Dec. 24, 2020.
Claims priority of provisional application 63/034,391, filed on Jun. 3, 2020.
Claims priority of provisional application 63/034,394, filed on Jun. 3, 2020.
Claims priority of provisional application 63/013,358, filed on Apr. 21, 2020.
Claims priority of provisional application 63/013,370, filed on Apr. 21, 2020.
Claims priority of provisional application 62/863,559, filed on Jun. 19, 2019.
Prior Publication US 2022/0344313 A1, Oct. 27, 2022
Int. Cl. H01L 21/00 (2006.01); H01L 25/075 (2006.01); H01L 25/16 (2023.01); H01L 33/38 (2010.01); H01L 33/60 (2010.01)
CPC H01L 25/0756 (2013.01) [H01L 25/167 (2013.01); H01L 33/382 (2013.01); H01L 33/60 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A micro-LED pixel unit, comprising,
a semiconductor substrate;
a light emitting region, formed on the semiconductor substrate, including a plurality of color LED structures including a top color LED stacked on top of a lower color LED structure, a bottom of each of the plurality of color LED structures being connected to a corresponding bonding metal layer in the light emitting region, wherein each of the plurality of color LED structures includes a light emitting layer and a reflective layer at a bottom of the light emitting layer;
a top electrode layer, covering each of the plurality of color LED structures and electrically contacting with the top color LED structure and the lower color LED structure of each of the plurality of color LED structures, wherein the semiconductor substrate is electrically connected with each of the plurality of color LED structures; and
a reflective cup, surrounding the light emitting region, light emitted from sidewalls of the light emitting layer of each of the plurality of color LED structures in a horizontal direction arriving at and being reflected upward by the reflective cup, a top of the reflective cup being higher than a top of the light emitting region.