US 11,963,377 B2
Light-emitting diode light extraction layer having graded index of refraction
Gang Yu, Santa Barbara, CA (US); Chung-Chia Chen, New Taipei (TW); Wan-Yu Lin, Taipei (TW); Hyunsung Bang, Aschaffenburg (DE); Lisong Xu, San Jose, CA (US); Byung Sung Kwak, Portland, OR (US); and Robert Jan Visser, Menlo Park, CA (US)
Assigned to Applied Materials, Inc., Santa Clara, CA (US)
Filed by Applied Materials, Inc., Santa Clara, CA (US)
Filed on Mar. 31, 2022, as Appl. No. 17/710,939.
Application 17/710,939 is a continuation of application No. 16/685,968, filed on Nov. 15, 2019, granted, now 11,296,296.
Claims priority of provisional application 62/931,760, filed on Nov. 6, 2019.
Prior Publication US 2022/0223811 A1, Jul. 14, 2022
Int. Cl. H01L 51/00 (2006.01); H10K 30/35 (2023.01); H10K 50/11 (2023.01); H10K 50/13 (2023.01); H10K 50/856 (2023.01); H10K 50/858 (2023.01); H10K 71/00 (2023.01); H10K 71/15 (2023.01)
CPC H10K 50/13 (2023.02) [H10K 30/35 (2023.02); H10K 50/11 (2023.02); H10K 50/856 (2023.02); H10K 50/858 (2023.02); H10K 71/00 (2023.02); H10K 71/15 (2023.02); H10K 71/311 (2023.02)] 16 Claims
OG exemplary drawing
 
1. A light-emitting diode display, comprising:
a substrate having a driving circuitry; and
a plurality of light emitting diode structures disposed on the substrate, each light-emitting diode structure including
a light emitting diode with a light emission zone having a planar portion, and
a pigmentless light extraction layer comprising a UV-cured ink disposed over the light-emitting diode, the light extraction layer having a gradient in index of refraction along an axis normal to the planar portion, wherein the index of refraction of the light extraction layer decreases with distance from the planar portion.