Patent ID: 7790915

Claim:
A nematic compound expressed by formula (1a): wherein the ring A 1 is 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl or naphthalene-2,6-diyl, in which any hydrogen can be replaced by halogen; the ring A 2 is 2,6-difluoro-1,4-phenylene; Z 1 and Z 2 are independently a single bond, —(CH 2 ) 2 —, —(CH 2 ) 4 —, —CF 2 O—, —OCF 2 — or —COO—; Z 3 is a single bond; X a , X b , X d and X e are independently hydrogen or fluorine; X′ is fluorine; X f is hydrogen; Y is —OCH 2 F, —OCHF 2 , —OCF 3 , —SCH 2 F, —SCHF 2 , —SCF 3 , —CH 2 F, —CHF 2 , —CF 3 , fluorine or chlorine, L a and L b are independently hydrogen or fluorine; and “l” and “m” are independently equal to 0 or 1.