US2017088776A1PendingUtilityA1
Liquid crystal medium and electrooptical display containing same
Est. expiryJul 2, 2024(expired)· nominal 20-yr term from priority
C09K 19/12C09K 19/44C09K 19/3444C09K 19/02C09K 2019/3422C09K 2019/3016C09K 19/3003C09K 19/3402C09K 2019/3009C09K 19/345C09K 2019/3004G02F 1/1393C09K 19/3001C09K 2019/301C09K 19/3098G02F 2001/13712G02F 1/13G02F 1/13712
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Claims
Abstract
The present invention relates to nematic liquid-crystal media of negative dielectric anisotropy which have a peak time (t max. ) of 0.25 ms or less, which is determined as described in the disclosure, and which preferably have a value of the quotient of the peak time and the square of the birefringence (t max /Δn 2 ) of 22 ms or less, and to the use of these liquid-crystal media in liquid-crystal displays, and to these liquid-crystal displays.
Claims
exact text as granted — not AI-modified1 - 11 . (canceled)
12 . Δn electro-optical display containing a liquid-crystal medium having negative dielectric anisotropy, and having a peak time (t max ) of 0.25 ms or less, which is determined with the aid of equations (1) and (2),
Equation
(
1
)
I
(
θ
b
)
=
S
(
2
α
1
sin
2
θ
b
cos
2
θ
b
-
γ
2
cos
2
θ
b
+
γ
3
)
(
ɛ
0
Δɛ
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
Equation
(
2
)
t
(
θ
b
)
=
β
2
2
ɛ
0
Δɛ
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
ɛ
0
Δɛ
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/l (U=90 V and l=22 μm are assumed),
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 +2α 1 γ 3 ,
β 2 =γ 1 2 +γ 2 2 −2γ 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 and
γ 3 =α 3 +α 4 +α 5 , wherein
for the Leslie viscosity coefficients, the following assumptions apply
α 1 =−10 mPas and
α 3 =0 mPas,
in addition, for α 3 =0 in accordance with Parodi:
α 4 +α 5 =−α 2 +2η 2
η 2 ≈ρ*υ
where:
ρ=density of about 1 g/cm 3 and
υ=flow viscosity,
wherein
the medium comprises 98% or more of components A and B, and
the medium comprises 60-70% of components A,
component A is a dielectrically negative, liquid-crystalline component, which consists of:
33% to 37%, based on the medium, of at least one compound of formula I-1
and 3% to 17%, based on the medium, of at least one compound of formula I-3
in which R 11″ is C 3-7 -alkyl, R 11 ′ is C 1-7 -alkyl, R 12′ is alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, alkenyl or alkenyloxy having 2 to 7 C atoms, where in R 11′ and R 12′ one or more H atoms in all groups may be replaced by halogen atoms,
wherein in at least one compound of formula I-1 R 12′ is C 4 -alkoxy,
and the remainder of component A is of one or more dielectrically negative compound(s) of formula I, which are not compounds of formula I-1 or I-3,
in which at least one of
denotes
and the others, if present, in each case, independently of one another, have the same meaning or denote
R 11 and R 12 , independently of one another, denote alkyl having 1 to 7 C atoms,
L 11 and L 12 , independently of one another, denote C—F or N,
Z 11 and Z 12 , in each case independently of one another, denote —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—, or a single bond, and
n denotes 0, 1 or 2,
and
component B is a dielectrically neutral, liquid-crystalline component, which consists of one or more dielectrically neutral compound(s) of formula II
in which
R 21 and R 22 , in each case independently of one another, are C 1-7 -alkyl, C 1-7 -alkoxy, or alkoxyalkyl, alkenyl or alkenyloxy having 2-7 cations in which one or more H atoms in all groups may be replaced by halogen atoms,
Z 21 to Z 23 , in each case independently of one another, are —CH 2 —CH 2 —, —C≡C—, —CH═CH—, —COO— or a single bond,
and
in each case independently of one another, denote
and
p and q, in each case independently of one another, denote 0 or 1;
and wherein one or more of the following conditions apply:
condition 1: the liquid-crystal medium has a value of the quotient of peak time and square of birefringence (t max /Δn 2 ) of 22 ms or less;
condition 2: the liquid-crystal medium has an average of the dielectric constants in the range from 5.5 or more to 6.5 or less;
condition 3: the liquid-crystal medium has a dielectric anisotropy in the range from −3.0 or less to −4.0 or more;
condition 4: the liquid-crystal medium has a birefringence in the range from 0.070 to 0.110;
condition 5: the liquid crystalline medium comprises 30% to 37% of at least one compound of formula II that is of formula II-1 or II-4
in which
R 21 and R 22 , in each case independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, alkenyl or alkenyloxy having 2 to 7 C atoms, where one or more H atoms in all groups may be replaced by halogen atoms;
condition 6: R 11′ is C 1-3 -alkyl;
condition 7: R 11′ is C 2-3 -alkyl;
condition 8: R 11 is C 3-7 -alkyl;
condition 9: I-3 is
and n and m are 2;
condition 10: I-3 is
and n is 3 and m is 2;
condition 11: the compounds of Formula I are compounds of one or more of Formulae I-2, I-4 or I-5
condition 12: the medium comprises 99% to 100% of components A and B;
condition 13: the concentration of the compounds of formula I-3 is 10% or more;
condition 14: the concentration of the compounds of formula I-3 is 13% or more;
condition 15: the concentration of component A is 65-69%;
condition 16: one or more compounds of formula I are of formula I-2
wherein R 11 and R 12 , independently of one another, denote alkyl having 1 to 7 C atoms,
which compounds of formula I-2 have a concentration of 20-30%, based on the medium;
condition 17: Z 21 and Z 23 are each independently —CH 2 —CH 2 or a single bond;
condition 18: Z 21 and Z 23 are single bonds;
condition 19: the one or more compounds of Formula II are of one or more of the following formulae
in which Y 1 is H or F, and R 21 and R 22 are defined as for the compounds of formula II;
condition 20: the concentration of the compounds of formula I-2 is 21% to 25%;
condition 21: the one or more compounds of Formula II contain or are a compound of the formula CC-3-V:
condition 22: component A contains 34% to 37% of at least one compound of formula I-1;
condition 23: component A contains at least two compounds of formula I-1 in which R 12 is C 4 -alkoxy;
condition 24: the liquid crystalline medium contains three or more compounds of formula I-1;
condition 25: the liquid crystalline medium contains four or more compounds of formula I-1;
condition 26: the compounds of formula I-3 contain at least one compound of I-3 in which R 11′ is C 3-5 alkyl;
condition 27: Z 21 to Z 23 are each a single bond.
13 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 1 applies.
14 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 2 applies.
15 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 3 applies.
16 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 4 applies.
17 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 5 applies.
18 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 6 applies.
19 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 7 applies.
20 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 8 applies.
21 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 9 applies.
22 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 10 applies.
23 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 11 applies.
24 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 12 applies.
25 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 13 applies.
26 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 14 applies.
27 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 15 applies.
28 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 16 applies.
29 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 17 applies.
30 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 18 applies.
31 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 19 applies.
32 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 20 applies.
33 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 21 applies.
34 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 22 applies.
35 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 23 applies.
36 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 24 applies.
37 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 25 applies.
38 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 26 applies.
39 . An electro-optical display containing a liquid-crystal medium according to claim 12 wherein condition 27 applies.
40 . A method for optimizing of the response time of a liquid-crystal display, comprising using in said display a liquid-crystal medium having negative dielectric anisotropy, and having a peak time (t max ) of 0.25 ms or less, which is determined with the aid of equations (1) and (2),
Equation
(
1
)
I
(
θ
b
)
=
S
(
2
α
1
sin
2
θ
b
cos
2
θ
b
-
γ
2
cos
2
θ
b
+
γ
3
)
(
ɛ
0
Δɛ
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
Equation
(
2
)
t
(
θ
b
)
=
β
2
2
ɛ
0
Δɛ
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
ɛ
0
Δɛ
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/l (U=90 V and l=22 μm are assumed),
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 +2α 1 γ 3 ,
β 2 =γ 1 2 +γ 2 2 −2γ 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 and
γ 3 =α 3 +α 4 +α 5 , wherein
for the Leslie viscosity coefficients, the following assumptions apply
α 1 =−10 mPas and
α 3 =0 mPas,
in addition, for α 3 =0 in accordance with Parodi:
α 4 +α 5 =−α 2 +2η 2
η 2 ≈ρ*υ
where:
ρ=density of about 1 g/cm 3 and
υ=flow viscosity,
wherein
the medium comprises 98% or more of components A and B, and the medium comprises 60-70% of components A,
component A is a dielectrically negative, liquid-crystalline component, which consists of:
33% to 37%, based on the medium, of at least one compound of formula I-1
and 3% to 17%, based on the medium, of at least one compound of formula I-3
in which R 11″ is C 3-7 -alkyl, R 11 ′ is C 1-7 -alkyl, R 12′ is alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, alkenyl or alkenyloxy having 2 to 7 C atoms, where in R 11′ and R 12′ one or more H atoms in all groups may be replaced by halogen atoms,
wherein in at least one compound of formula I-1 R 12′ is C 4 -alkoxy,
and the remainder of component A is of one or more dielectrically negative compound(s) of formula I, which are not compounds of formula I-1 or I-3,
in which at least one of
denotes
and the others, if present, in each case, independently of one another, have the same meaning or denote
R 11 and R 12 , independently of one another, denote alkyl having 1 to 7 C atoms,
L 11 and L 12 , independently of one another, denote C—F or N,
Z 11 and Z 12 , in each case independently of one another, denote —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—, or a single bond, and
n denotes 0, 1 or 2,
and
component B is a dielectrically neutral, liquid-crystalline component, which consists of one or more dielectrically neutral compound(s) of formula II
in which
R 21 and R 22 , in each case independently of one another, are C 1-7 -alkyl, C 1-7 -alkoxy, or alkoxyalkyl, alkenyl or alkenyloxy having 2-7 cations in which one or more H atoms in all groups may be replaced by halogen atoms,
Z 21 to Z 23 , in each case independently of one another, are —CH 2 —CH 2 —, —C≡C—, —CH═CH—, —COO— or a single bond,
and
in each case independently of one another, denote
and
p and q, in each case independently of one another, denote 0 or 1;
and wherein one or more of the following conditions apply:
condition 1: the liquid-crystal medium has a value of the quotient of peak time and square of birefringence (t max /Δn 2 ) of 22 ms or less;
condition 2: the liquid-crystal medium has an average of the dielectric constants in the range from 5.5 or more to 6.5 or less;
condition 3: the liquid-crystal medium has a dielectric anisotropy in the range from −3.0 or less to −4.0 or more;
condition 4: the liquid-crystal medium has a birefringence in the range from 0.070 to 0.110;
condition 5: the liquid crystalline medium comprises 30% to 37% of at least one compound of formula II that is of formula II-1 or II-4
in which
R 21 and R 22 , in each case independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, alkenyl or alkenyloxy having 2 to 7 C atoms, where one or more H atoms in all groups may be replaced by halogen atoms;
condition 6: R 11′ is C 1-3 -alkyl;
condition 7: R 11′ is C 2-3 -alkyl;
condition 8: R 11 is C 3-7 -alkyl;
condition 9: I-3 is
and n and m are 2;
condition 10: I-3 is
and n is 3 and m is 2;
condition 11: the compounds of Formula I are compounds of one or more of Formulae I-2, I-4 or 1-5
condition 12: the medium comprises 99% to 100% of components A and B;
condition 13: the concentration of the compounds of formula I-3 is 10% or more;
condition 14: the concentration of the compounds of formula I-3 is 13% or more;
condition 15: the concentration of component A is 65-69%;
condition 16: one or more compounds of formula I are of formula I-2
wherein R 11 and R 12 , independently of one another, denote alkyl having 1 to 7 C atoms,
which compounds of formula I-2 have a concentration of 20-30%, based on the medium;
condition 17: Z 21 and Z 23 are each independently —CH 2 —CH 2 or a single bond;
condition 18: Z 21 and Z 23 are single bonds;
condition 19: the one or more compounds of Formula II are of one or more of the following formulae
in which Y 1 is H or F, and R 21 and R 22 are defined as for the compounds of formula II;
condition 20: the concentration of the compounds of formula I-2 is 21% to 25%;
condition 21: the one or more compounds of Formula II contain or are a compound of the formula CC-3-V:
condition 22: component A contains 34% to 37% of at least one compound of formula I-1;
condition 23: component A contains at least two compounds of formula I-1 in which R 12 is C 4 -alkoxy;
condition 24: the liquid crystalline medium contains three or more compounds of formula I-1;
condition 25: the liquid crystalline medium contains four or more compounds of formula I-1;
condition 26: the compounds of formula I-3 contain at least one compound of I-3 in which R 11′ is C 3-5 alkyl;
condition 27: Z 21 to Z 23 are each a single bond.
41 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 1 applies.
42 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 2 applies.
43 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 3 applies.
44 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 4 applies.
45 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 5 applies.
46 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 6 applies.
47 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 7 applies.
48 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 8 applies.
49 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 9 applies.
50 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 10 applies.
51 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 11 applies.
52 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 12 applies.
53 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 13 applies.
54 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 14 applies.
55 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 15 applies.
56 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 16 applies.
57 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 17 applies.
58 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 18 applies.
59 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 19 applies.
60 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 20 applies.
61 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 21 applies.
62 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 22 applies.
63 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 23 applies.
64 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 24 applies.
65 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 25 applies.
66 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 26 applies.
67 . A method for optimizing of the response time of a liquid-crystal display according to claim 40 wherein condition 27 applies.Join the waitlist — get patent alerts
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