CN113320386A - Full liquid crystal panel board of car that low temperature stability is good and reliability is high - Google Patents
Full liquid crystal panel board of car that low temperature stability is good and reliability is high Download PDFInfo
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- CN113320386A CN113320386A CN202110635710.1A CN202110635710A CN113320386A CN 113320386 A CN113320386 A CN 113320386A CN 202110635710 A CN202110635710 A CN 202110635710A CN 113320386 A CN113320386 A CN 113320386A
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- Prior art keywords
- carbon atoms
- formula
- liquid crystal
- compound
- instrument panel
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- Granted
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 46
- 150000001875 compounds Chemical class 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 239000012769 display material Substances 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- LMBFAGIMSUYTBN-MPZNNTNKSA-N teixobactin Chemical compound C([C@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H](CCC(N)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H]1C(N[C@@H](C)C(=O)N[C@@H](C[C@@H]2NC(=N)NC2)C(=O)N[C@H](C(=O)O[C@H]1C)[C@@H](C)CC)=O)NC)C1=CC=CC=C1 LMBFAGIMSUYTBN-MPZNNTNKSA-N 0.000 claims abstract description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 47
- 125000003545 alkoxy group Chemical group 0.000 claims description 16
- 125000000217 alkyl group Chemical group 0.000 claims description 15
- 125000003342 alkenyl group Chemical group 0.000 claims description 9
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 125000004429 atom Chemical group 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 7
- 210000004027 cell Anatomy 0.000 description 6
- 210000002858 crystal cell Anatomy 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004990 Smectic liquid crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Liquid Crystal Substances (AREA)
Abstract
The automobile full liquid crystal instrument panel comprises an upper substrate, a lower substrate and a liquid crystal box clamped between the upper substrate and the lower substrate, wherein the liquid crystal box is filled with a VA mode display material and consists of a main body mixture and an additive; the host mixture comprises a compound of formula I, a compound of formula II, a compound of formula III, and a compound of formula IV; the additive is selected from compounds of formula VIII. The instrument panel has better low-temperature stability; and has high reliability to ultraviolet light.
Description
Technical Field
The invention belongs to the technical field of intelligent instrument panels, and particularly relates to an automobile all-liquid-crystal instrument panel with good low-temperature stability and high reliability.
Background
With the rapid development of economy and the improvement of the living standard of people, automobiles become main vehicles of ordinary families. As a device for reflecting the operation status of each system of an automobile, an automobile dashboard is one of the most contacted automobile parts in daily life. Traditionally, the rotation speed, water temperature, oil quantity and speed per hour are displayed by a mechanical instrument panel. The mechanical instrument panel has the characteristics of stable technology, maturity and reliability.
However, in recent years, due to the rapid development of automobile, communication and display technologies, more intuitive and more modern display devices are required to meet the demand of people for instant messaging, navigation and entertainment, and thus, full liquid crystal dashboards are called for. The novel instrument panel is applied to the automobile by the characteristics of unique lightness, low power consumption and colored flowers to replace the traditional mechanical instrument panel, realizes the digital display function and is used for displaying the average oil consumption, the instantaneous oil consumption, the outdoor temperature, the average speed, the driving time, the driving mileage, the navigation and the multimedia entertainment of the automobile. The full liquid crystal instrument panel is safer during driving; the display effect is better, and the science and technology sense is stronger.
As a liquid crystal display device for an automobile instrument panel, display modes such as TN (twisted nematic), STN (super twisted nematic), and VA (vertical alignment) are commonly used. The response time of TN and STN display modes is short, the working temperature is wide, but the contrast and the visual angle are not ideal. The VA display mode has features of a wide viewing angle and a high contrast, but is easily crystallized or a smectic phase occurs at a low temperature while the response time at a low temperature is slightly long.
On the other hand, the VA display mode display material also needs to satisfy certain reliability requirements, especially reliability to ultraviolet light, which is closely related to the service life of the automobile instrument panel.
Therefore, in view of the above-mentioned drawbacks of the prior art, it is urgently needed to provide an all-liquid-crystal instrument panel for an automobile, which has good low-temperature stability and high reliability.
Disclosure of Invention
The invention aims to provide an automobile all-liquid-crystal instrument panel with good low-temperature stability and high reliability. Compared with the prior art, the low-temperature stability of the automobile full-liquid crystal instrument panel is better; and has high reliability to ultraviolet light.
In order to solve the technical problems, the invention adopts the following technical scheme: a full liquid crystal instrument panel for an automobile comprises an upper substrate, a lower substrate and a liquid crystal box clamped between the upper substrate and the lower substrate, wherein polyimide PI alignment layers are arranged on the inner surfaces of the upper substrate and the lower substrate, and a VA-mode display material is filled in the liquid crystal box; characterized in that the display material consists of a host mixture and an additive; the host mixture comprising at least one compound of formula I, at least one compound of formula II, at least one compound of formula III, and at least one compound of formula IV,
wherein R is1And R2Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
wherein R is3And R4Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
wherein R is5Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r6Represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
wherein R is7And R8Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
the additive is selected from the group consisting of compounds of formula IX,
wherein m is an integer of 6 to 10.
In the present invention, alkenyl is defined as one or more non-adjacent CH2Alkyl substituted with CH ═ CH.
The automobile full liquid crystal instrument panel is characterized in that the content of the compound shown in the formula I is 6-14%, preferably 8-12%; the content of the compound of the formula II is 6-12%, preferably 8-10%; the content of the compound of the formula III is 10-20%, preferably 12-18%; the content of the compound of formula IV is 4-8%, preferably 5-7%; based on the total weight of the host mixture.
The automobile all-liquid crystal instrument panel further comprises a compound shown in the formula V,
wherein R is9Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r10Represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms; ring A represents
The automobile full liquid crystal instrument panel is characterized in that the content of the compound shown in the formula V is 4-12%, preferably 6-10%; based on the total weight of the host mixture.
The automobile all-liquid crystal instrument panel further comprises a compound shown in a formula VI,
wherein R is11Represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms; r12Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms.
The automobile all-liquid-crystal instrument panel is characterized in that the content of the compound shown in the formula VI is 22-34%, preferably 26-30%; based on the total weight of the host mixture.
The automobile all-liquid crystal instrument panel further comprises a compound shown in a formula VII,
wherein R is13Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r14Represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms.
The automobile full liquid crystal instrument panel is characterized in that the content of the compound shown in the formula VII is 10-18%, preferably 12-15%; based on the total weight of the host mixture.
The automobile all-liquid crystal instrument panel further comprises a compound shown in a formula VIII,
wherein R is15And R16Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms.
The automobile full liquid crystal instrument panel is characterized in that the content of the compound shown in the formula VIII is 4-9%, preferably 5-8%; based on the total weight of the host mixture.
The automobile full liquid crystal instrument panel is characterized in that the additive is added in an amount of 0.005-0.2%, preferably 0.01-0.1%; based on the total weight of the host mixture.
In a further preferred embodiment, the display material according to the invention advantageously consists of the compounds of the formulae I to IX described above.
The inventors have found that combining different monomers using specific proportions and specific structures, in particular specific cyclic units and side groups, to give a host mixture, and mixing with additives in corresponding proportions, gives a display material for an automotive all-liquid crystal instrument panel, which fills the liquid crystal cells of the automotive all-liquid crystal instrument panel. Compared with the prior art, the liquid crystal box of the automobile full liquid crystal instrument panel has better low-temperature stability; and has high reliability to ultraviolet light.
Detailed Description
The invention will be further illustrated with reference to specific embodiments.
It should be understood that the detailed description of the invention is merely illustrative of the spirit and principles of the invention and is not intended to limit the scope of the invention. Furthermore, it should be understood that various changes, substitutions, deletions, modifications or adjustments may be made by those skilled in the art after reading the disclosure of the present invention, and such equivalents are also within the scope of the invention as defined in the appended claims.
In the present invention, all parts are parts by weight unless otherwise specified; all percentages are by weight; cp denotes clearing point in deg.C.
Δ n represents the optical anisotropy value at 25 ℃ and 589 nm.
Δ ε represents the value of the dielectric anisotropy obtained with a 6 μm thick VA test cell at 25 ℃ and 1 kHz.
γ 1 represents the rotational viscosity (mPas) measured at 25 ℃.
In the present invention, each monomer compound is represented by a three-stage abbreviation of (cyclic unit + linker) + left-side group + right-side group. Wherein the content of the first and second substances,
linker and pendant group:
n(O)-＝CnH2n+1(O)-；
-(O)n＝-(O)CnH2n+1；
Vn-＝CH2＝CHCnH2n-；
-nV＝-CnH2nCH＝CH2；
-V＝-CH＝CH2；
-V-＝-CH＝CH-；
-T-＝-C≡C-；
-1O-＝-CH2O-；
-Q-＝-CF2O-；
n＝CnH2n+1；
n is a natural number;
o represents an oxygen atom.
Cyclic unit:
Example 1 host mixture
Δn＝0.097；Δε＝-4.2；Cp＝81.9；γ1＝84。
Example 2 host mixture
Example 3 host mixture
Further, in order to test the low temperature stability of example 1, the bulk mixture was filled into a VA test cell (upper and lower substrate inner surfaces having polyimide PI alignment layers) of 6 μm thickness for an automotive all liquid crystal instrument panel, which was placed in a refrigerator at-20 ℃, and whether or not a crystalline or smectic phase occurred in the VA test cell was observed at regular intervals, to determine the duration of the low temperature stability, i.e., the last observed phase stabilization holding time (LTS, h).
On the other hand, the response time (τ, ms) is the sum of the rise time and the fall time of the VA test cell at-20 ℃ and a drive voltage of 6V; the former is defined as the time for which the transmittance rises from 10% of the maximum transmittance until 90% is reached; the latter is the time for the transmittance to drop from 90% of the maximum transmittance until 10% is reached.
See table 1 for results.
TABLE 1
| Test box | LTS，h | Response time (τ, ms) |
| Example 1 | >1300h | 12.83 |
As can be seen from Table 1, the host mixture of example 1 of the present invention has better low temperature stability. On the basis of the above, the liquid crystal cell filled with the host mixture obtained by adding the additive in an amount of not more than 0.2% is substantially unchanged in the above properties.
In yet another aspect, the host mixture of example 1 was mixed with an additive of a compound of formula IX (m ═ 8), the latter added in an amount of 0.05%, to give the display material of example 1. Then, the VA test cell was filled with a display material.
The voltage holding ratio VHR was tested at 25 ℃ and under conditions of 6V voltage, pulse width of 10ms and voltage holding time of 166.7msini(%). In addition, the display material of example 1 was irradiated with 5000mJ energy under an ultraviolet lamp having a wavelength of 365nm, and then tested for a voltage holding ratio VHR after the ultraviolet irradiationuv(％)。
VHRiniAnd VHRuvThe smaller the difference between indicates the higher the cell reliability of the filled display material.
See table 2 for results.
TABLE 2
| Liquid crystal cell filled with display material | VHRini(％) | VHRuv(％) |
| Example 1 | 99.89 | 99.85 |
As can be seen from table 2, the liquid crystal cell of example 1 of the present invention has high reliability against ultraviolet light.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A full liquid crystal instrument panel for an automobile comprises an upper substrate, a lower substrate and a liquid crystal box clamped between the upper substrate and the lower substrate, wherein polyimide PI alignment layers are arranged on the inner surfaces of the upper substrate and the lower substrate, and a VA-mode display material is filled in the liquid crystal box; characterized in that the display material consists of a host mixture and an additive; the host mixture comprising at least one compound of formula I, at least one compound of formula II, at least one compound of formula III, and at least one compound of formula IV,
wherein R is1And R2Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
wherein R is3And R4Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
wherein R is5Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r6Represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
wherein R is7And R8Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
the additive is selected from the group consisting of compounds of formula IX,
wherein m is an integer of 6 to 10.
2. The automotive all-liquid crystal instrument panel according to claim 1, wherein the content of the compound of formula I is 6-14%, preferably 8-12%; the content of the compound of the formula II is 6-12%, preferably 8-10%; the content of the compound of the formula III is 10-20%, preferably 12-18%; the content of the compound of formula IV is 4-8%, preferably 5-7%; based on the total weight of the host mixture.
3. The automotive all-liquid crystal instrument panel according to claim 1 or 2, further comprising a compound of formula V,
wherein R is9Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r10Represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms; ring A represents
4. The automotive all-liquid crystal instrument panel according to claim 3, wherein the content of the compound of formula V is 4-12%, preferably 6-10%; based on the total weight of the host mixture.
5. The automotive all-liquid crystal instrument panel according to claim 1 or 2, further comprising a compound of formula VI and/or formula VII,
wherein R is11Represents 1 to 8 carbonsAlkyl or alkoxy groups of atoms preferably 1 to 6 carbon atoms; r12Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms;
wherein R is13Represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r14Represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms.
6. The automotive all-liquid crystal instrument panel according to claim 5, wherein the content of the compound of formula VI is 22-34%, preferably 26-30%; and/or the compound of formula VII is present in an amount of 10-18%, preferably 12-15%; based on the total weight of the host mixture.
7. The automotive all-liquid crystal instrument panel according to claim 1 or 2, further comprising a compound of formula VIII,
wherein R is15And R16Each independently represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms.
8. The automotive all-liquid crystal instrument panel according to claim 7, wherein the content of the compound of formula VIII is 4-9%, preferably 5-8%; based on the total weight of the host mixture.
9. The automotive all-liquid-crystal instrument panel according to claim 1 or 2, wherein the additive is added in an amount of 0.005-0.2%, preferably 0.01-0.1%; based on the total weight of the host mixture.
10. The automotive all-liquid crystal instrument panel according to any one of claims 1 to 9, wherein the display material is composed of the compounds of formulae I to IX.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110635710.1A CN113320386B (en) | 2021-06-08 | 2021-06-08 | Automobile full-liquid-crystal instrument panel with good low-temperature stability and high reliability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110635710.1A CN113320386B (en) | 2021-06-08 | 2021-06-08 | Automobile full-liquid-crystal instrument panel with good low-temperature stability and high reliability |
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| Publication Number | Publication Date |
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| CN113320386A true CN113320386A (en) | 2021-08-31 |
| CN113320386B CN113320386B (en) | 2023-08-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000104072A (en) * | 1990-08-03 | 2000-04-11 | Merck Patent Gmbh | Liquid crystal medium |
| CN102344815A (en) * | 2011-07-12 | 2012-02-08 | 石家庄诚志永华显示材料有限公司 | Negative dielectric anisotrophy liquid crystal mixture |
| JP2014115192A (en) * | 2012-12-10 | 2014-06-26 | Yazaki Corp | Vehicle instrument device |
| CN111484857A (en) * | 2019-01-29 | 2020-08-04 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition, liquid crystal display element and liquid crystal display |
| CN111983851A (en) * | 2020-09-09 | 2020-11-24 | 深圳市猿人创新科技有限公司 | Automobile data recorder display device |
| CN113320385A (en) * | 2021-06-08 | 2021-08-31 | 浙江汽车仪表有限公司 | Automobile full liquid crystal instrument panel with short low-temperature response time and high reliability |
-
2021
- 2021-06-08 CN CN202110635710.1A patent/CN113320386B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000104072A (en) * | 1990-08-03 | 2000-04-11 | Merck Patent Gmbh | Liquid crystal medium |
| CN102344815A (en) * | 2011-07-12 | 2012-02-08 | 石家庄诚志永华显示材料有限公司 | Negative dielectric anisotrophy liquid crystal mixture |
| JP2014115192A (en) * | 2012-12-10 | 2014-06-26 | Yazaki Corp | Vehicle instrument device |
| CN111484857A (en) * | 2019-01-29 | 2020-08-04 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition, liquid crystal display element and liquid crystal display |
| CN111983851A (en) * | 2020-09-09 | 2020-11-24 | 深圳市猿人创新科技有限公司 | Automobile data recorder display device |
| CN113320385A (en) * | 2021-06-08 | 2021-08-31 | 浙江汽车仪表有限公司 | Automobile full liquid crystal instrument panel with short low-temperature response time and high reliability |
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