US 12,168,732 B2
Light emitting element ink and method of manufacturing display device utilizing electric field
Jun Bo Sim, Suwon-si (KR); Hyo Jin Ko, Seoul (KR); Duk Ki Kim, Suwon-si (KR); Chang Hee Lee, Seoul (KR); and Jae Kook Ha, Seoul (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., LTD., Yongin-si (KR)
Filed on Sep. 12, 2023, as Appl. No. 18/465,881.
Application 18/465,881 is a division of application No. 17/233,288, filed on Apr. 16, 2021, granted, now 11,787,964.
Claims priority of application No. 10-2020-0048795 (KR), filed on Apr. 22, 2020.
Prior Publication US 2023/0416548 A1, Dec. 28, 2023
Int. Cl. C09D 11/38 (2014.01); C09D 11/50 (2014.01); C09K 11/06 (2006.01); H10K 50/844 (2023.01); H10K 71/00 (2023.01)
CPC C09D 11/38 (2013.01) [C09D 11/50 (2013.01); H10K 50/844 (2023.02); H10K 71/00 (2023.02); C09K 11/06 (2013.01); C09K 2211/10 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of manufacturing a display device, comprising:
preparing a light emitting element ink comprising a light emitting element solvent, a plurality of light emitting elements, and a thickener, and preparing a target substrate comprising a first electrode and a second electrode on the target substrate;
ejecting the light emitting element ink onto the target substrate;
forming an electric field on the target substrate to place the light emitting elements on the first electrode and the second electrode; and
heat-treating the light emitting element ink under a low-pressure environment to remove the light element solvent and the thickener,
wherein a compound of the thickener of the light emitting element ink comprises a functional group capable of forming a hydrogen bond together with a compound of the light emitting element solvent or another compound of the thickener, and comprises a compound represented by Chemical Formula 1 below:

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 1, each R1 is independently a substituted or unsubstituted alkyl group having 6 to 8 carbon atoms, an alkene group, an alkenyl group, or an alkynyl group, and each R2 is independently an alkyl group having 3 to 8 carbon atoms.