Nematic liquid-crystal medium having negative dielectric anisotropy, characterised in that it has a peak time (t max), determined with the aid of equations and, I θ b = S 2 α 1 sin 2 θ b cos 2 θ b − γ 2 cos 2 θ b + γ 3 ε 0 Δ ε sin 2 θ b 2 E b 3 α 1 γ 1 + γ 2 2 sin 2 2 θ b − γ 1 2 − γ 2 2 + 2 γ 1 γ 3 t θ b = β 2 2 ε 0 Δε E b 2 β 3 − ln tan θ b tan θ 0 + − β 5 + γ 2 β 1 2 β 4 β 1 ln β 4 tan 2 θ b + β 7 + β 1 β 4 tan 2 θ 0 + β 7 + β 1 + β 5 + γ 2 β 1 2 β 4 β 1 ln β 4 tan 2 θ b + β 7 − β 1 β 4 tan 2 θ 0 + β 7 − β 1 + β 6 2 ε 0 Δε E b 2 β 1 ln α 1 cos 2 θ b + γ 2 + β 1 α 1 cos 2 θ 0 + γ 2 − β 1 α 1 cos 2 θ b + γ 2 − β 1 α 1 cos 2 θ 0 + γ 2 + β 1 where: S = electrode area, E b = U/I, U = 90 V, I = 22 μm, θ 0 = bulk tilt angle at time t = 0 θ b = bulk tilt angle α 1 to α 5 = Leslie viscosity coefficients, β 1 = α 1 2 + γ 2 2 + 2 α 1 γ 3, β 2 = γ 1 2 + γ 2 2 − 2 γ 1 γ 3, β 3 = γ 2 − γ 3 β 4 = γ 2 + γ 3, β 5 = γ 2 2 + α 1 γ 3, β 6 = α 1 γ 1 + γ 2 2, β 7 = α 1 + γ 3 γ 1 = − α 2 = Rotational viscosity, γ 2 = α 3 − α 2, γ 3 = α 3 + α 4 + α 5, α 1 = − 10 mPa ⋅ s and α 3 = 0 mPa ⋅ s, α 4 + α 5 = − α 2 + 2 η 2 = γ 1 + 2 η 2, η 2 ≈ ρ * ν where: ρ = density = about 1 g/cm 3 and ν = flow viscosity, where the rotational viscosity is determined using the rotating permanent magnet method and the flow viscosity is determined in a modified Ubbelohde viscometer, of 0.25 ms or less, a dielectric anisotropy at a temperature of 20°C and at 1 kHz in the range from -3.0 or less to -4.0 or more and a birefringence at a temperature of 20°C and at 589 nm in the range from 0.070 to 0.110 and a) one or more compounds of the formula I, selected from the group of the compounds of the formulae I-1 to I-5 in which R 11 and R 12, independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms or alkoxyalkyl, alkenyl or alkenyloxy having 2 to 7 C atoms, where in all groups one or more H atoms may be replaced by halogen atoms, b) one or more dielectrically neutral compounds of the formula II in which R 11 and R 12, independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms or alkoxyalkyl, alkenyl or alkenyloxy having 2 to 7 C atoms, where in all groups one or more H atoms may be replaced by halogen atoms, Z 21 to Z 23 in each case, independently of one another, de-note -CH 2 -CH 2 -, -C=C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -CH 2 -CF 2 -, -CF 2 -CH 2 -, -CF 2 -CF 2 -, -CO-O-, -O-CO-, -OCH 2 -, -CH 2 O-, -OCF 2 -, -CF 2 O- or a single bond, in each case, independently of one another, denote p and q in each case, independently of one another, denote 0 or 1, and the concentration of the compounds selected from the group of the compounds of the formulae I-1 to I-5 and II is 95% or more, selected from the group of the compounds of the formulae I-1 to I-5 is 60% or more to 70% or less and of the formula I-1 is 30% or more to 40% or less. S = electrode area, E b = U/I, U = 90 V, I = 22 μm, θ 0 = bulk tilt angle at time t = 0 θ b = bulk tilt angle α 1 to α 5 = Leslie viscosity coefficients, β 1 = α 1 2 + γ 2 2 + 2 α 1 γ 3, β 2 = γ 1 2 + γ 2 2 − 2 γ 1 γ 3, β 3 = γ 2 − γ 3 β 4 = γ 2 + γ 3, β 5 = γ 2 2 + α 1 γ 3, β 6 = α 1 γ 1 + γ 2 2, β 7 = α 1 + γ 3 γ 1 = − α 2 = Rotational viscosity, γ 2 = α 3 − α 2, γ 3 = α 3 + α 4 + α 5, α 1 = − 10 mPa ⋅ s and α 3 = 0 mPa ⋅ s, α 4 + α 5 = − α 2 + 2 η 2 = γ 1 + 2 η 2, η 2 ≈ ρ * ν where: ρ = density = about 1 g/cm 3 and ν = flow viscosity, ρ = density = about 1 g/cm 3 and ν = flow viscosity, a) one or more compounds of the formula I, selected from the group of the compounds of the formulae I-1 to I-5 in which R 11 and R 12, independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms or alkoxyalkyl, alkenyl or alkenyloxy having 2 to 7 C atoms, where in all groups one or more H atoms may be replaced by halogen atoms, R 11 and R 12, independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms or alkoxyalkyl, alkenyl or alkenyloxy having 2 to 7 C atoms, where in all groups one or more H atoms may be replaced by halogen atoms, b) one or more dielectrically neutral compounds of the formula II in which R 11 and R 12, independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms or alkoxyalkyl, alkenyl or alkenyloxy having 2 to 7 C atoms, where in all groups one or more H atoms may be replaced by halogen atoms, Z 21 to Z 23 in each case, independently of one another, de-note -CH 2 -CH 2 -, -C=C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -CH 2 -CF 2 -, -CF 2 -CH 2 -, -CF 2 -CF 2 -, -CO-O-, -O-CO-, -OCH 2 -, -CH 2 O-, -OCF 2 -, -CF 2 O- or a single bond, in each case, independently of one another, denote p and q in each case, independently of one another, denote 0 or 1, R 11 and R 12, independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms or alkoxyalkyl, alkenyl or alkenyloxy having 2 to 7 C atoms, where in all groups one or more H atoms may be replaced by halogen atoms, Z 21 to Z 23 in each case, independently of one another, de-note -CH 2 -CH 2 -, -C=C-, -CH=CH-, -CF=CF-, -CF=CH-, -CH=CF-, -CH 2 -CF 2 -, -CF 2 -CH 2 -, -CF 2 -CF 2 -, -CO-O-, -O-CO-, -OCH 2 -, -CH 2 O-, -OCF 2 -, -CF 2 O- or a single bond, in each case, independently of one another, denote p and q in each case, independently of one another, denote 0 or 1,