US 11,655,417 B2
Liquid-crystal medium
Su-Young Kim, Seoul (KR); Chang-Suk Choi, Chungcheongnam-do (KR); Jeong-Hee Sung, Kanagawa Pref. (JP); Ming Chou Wu, Taoyuan (TW); and Sang-Kyu Lee, Shanghai (CN)
Assigned to MERCK PATENT GMBH, Darmstadt (DE)
Filed by MERCK PATENT GMBH, Darmstadt (DE)
Filed on Apr. 27, 2020, as Appl. No. 16/859,354.
Claims priority of application No. 19171252 (EP), filed on Apr. 26, 2019.
Prior Publication US 2020/0339882 A1, Oct. 29, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/1333 (2006.01); C09K 19/34 (2006.01); C09K 19/12 (2006.01); C09K 19/20 (2006.01); C09K 19/30 (2006.01); C09K 19/32 (2006.01)
CPC C09K 19/3405 (2013.01) [C09K 19/12 (2013.01); C09K 19/2007 (2013.01); C09K 19/3003 (2013.01); C09K 19/32 (2013.01); C09K 19/3491 (2013.01); C09K 2019/122 (2013.01); C09K 2019/123 (2013.01); C09K 2019/124 (2013.01); C09K 2019/125 (2013.01); C09K 2019/2078 (2013.01); C09K 2019/301 (2013.01); C09K 2019/3004 (2013.01); C09K 2019/3009 (2013.01); C09K 2019/3012 (2013.01); C09K 2019/3016 (2013.01); C09K 2019/3025 (2013.01); C09K 2019/3422 (2013.01)] 11 Claims
 
1. A liquid crystal (LC) medium comprising 0.1 to 2% by weight, based on the total weight of the LC medium, of only one compound of formula LB

OG Complex Work Unit Chemistry
in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning:
R1 alkyl, alkoxy, oxaalkyl or alkoxyalkyl having 1 to 9 C atoms or alkenyl or alkenyloxy having 2 to 9 C atoms, all of which are optionally fluorinated,
L1, L2 F or Cl,
X1 fluorinated alkyl or alkoxy with 1, 2 or 3 C atoms,
Y1 O or S,
said medium having negative dielectric anisotropy of −2.5 to −7.5 at 20° C. and 1 kHz.