CN113071311B - High-reliability automobile full-liquid-crystal instrument panel - Google Patents
High-reliability automobile full-liquid-crystal instrument panel Download PDFInfo
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- CN113071311B CN113071311B CN202110370748.0A CN202110370748A CN113071311B CN 113071311 B CN113071311 B CN 113071311B CN 202110370748 A CN202110370748 A CN 202110370748A CN 113071311 B CN113071311 B CN 113071311B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 55
- 150000001875 compounds Chemical class 0.000 claims abstract description 41
- 239000012769 display material Substances 0.000 claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 12
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 239000004642 Polyimide Substances 0.000 claims abstract description 4
- 229920001721 polyimide Polymers 0.000 claims abstract description 4
- 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 43
- 125000003545 alkoxy group Chemical group 0.000 claims description 21
- 125000000217 alkyl group Chemical group 0.000 claims description 21
- 125000003342 alkenyl group Chemical group 0.000 claims description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 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
- 125000004429 atom Chemical group 0.000 description 1
- 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
- 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
-
- 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
- B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
- B60K2360/60—Structural details of dashboards or instruments
- B60K2360/68—Features of instruments
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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 inner surfaces of the upper substrate and the lower substrate are provided with polyimide PI alignment layers, and 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 at least one compound of formula I, at least one compound of formula II, and at least one compound of formula III; the additive is selected from compounds of formula VIII. Compared with the prior art, the liquid crystal box of the automobile full liquid crystal instrument panel has better low-temperature stability and shorter low-temperature response time; 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 a high-reliability automobile full-liquid-crystal instrument panel.
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 a highly reliable all-liquid-crystal instrument panel for automobiles, which has better low-temperature stability and shorter low-temperature response time.
Disclosure of Invention
The invention aims to provide a high-reliability automobile full-liquid-crystal instrument panel. Compared with the prior art, the automobile full-liquid crystal instrument panel has better low-temperature stability and shorter low-temperature response time; 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, and at least one compound of formula III,
wherein R1-R2 each independently represent an alkyl or alkoxy group of 1-8 carbon atoms, preferably 1-6 carbon atoms;
wherein R3 represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r4 represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms;
wherein R5-R6 each independently represent an alkyl or alkoxy group of 1-8 carbon atoms, preferably 1-6 carbon atoms;
the additive is selected from the group consisting of compounds of formula VIII,
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 10-20%, preferably 12-18%; the content of the compound of the formula II is 15-28%, preferably 18-24%; the content of the compound of the formula III 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 VII,
wherein R13 to R14 each independently represent 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 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 IV,
wherein R7 represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r8 represents 1 to 8 carbon atoms, preferably 1 to 6 carbonsAn alkyl or alkoxy group of atoms; ring A represents
The automobile full liquid crystal instrument panel is characterized in that the content of the compound shown in the 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 R9 represents an alkyl or alkoxy group of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms; r10 represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms.
The automobile full liquid crystal instrument panel is characterized in that the content of the compound shown in the formula V is 20-35%, preferably 25-30%; based on the total weight of the host mixture.
The automobile all-liquid crystal instrument panel further comprises a compound shown in a formula VI,
wherein R11 represents an alkenyl group of 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms; r12 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 VI is 8-18%, preferably 10-15%; 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 VIII 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 shorter low-temperature response time; (ii) a 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,
linker and pendant group:
n(O)-＝CnH2n+1(O)-；
-(O)n＝-(O)CnH2n+1；
Vn-＝CH2＝CHCnH2n-；
-nV＝-CnH2nCH＝CH2；
-V＝-CH＝CH2；
-T-＝-C≡C-；
-1O-＝-CH2O-
n＝CnH2n+1；
n is a natural number;
o represents an oxygen atom.
Cyclic unit:
example 1
3-CC1OW-O2 12％
2-CC1OW-O2 4％
V-C1OW-O2 15％
V-C1OW-O4 6％
5O-B-O2 8％
V-CW-2 6％
3-CC-V 20％
3-CC-V1 8％
V-CCP-1 6％
V2-CCP-3 7％
3-CPTP-O2 8％
Δn＝0.102；Δε＝-4.6；Cp＝84.6；γ1＝87。
Comparative example 1
3-CC1OW-O2 12％
2-CC1OW-O2 4％
3-C1OW-O2 15％
5-C1OW-O2 6％
3-CPTW-O2 8％
V-CW-2 6％
3-CC-V 20％
3-CC-V1 8％
V-CCP-1 6％
V2-CCP-3 7％
3-CPP-2 8％
Δn＝0.107；Δε＝-3.9；Cp＝78.4；γ1＝104。
Further, in order to test the low temperature stability of example 1 and comparative example 1, the display materials of both were filled in a VA test cell (upper and lower substrate inner surfaces having polyimide PI alignment layers) of 6 μm thickness for an all liquid crystal instrument panel of an automobile, 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 holding time (LTS, h) at which the phase stabilization was recently observed.
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 | >1100h | 14.42 |
| Comparative example 1 | 825-850h | 23.15 |
As can be seen from table 1, compared to comparative example 1, the liquid crystal cell of the all liquid crystal instrument panel for the automobile described in example 1 of the present invention has not only better low temperature stability, but also shorter low temperature response time. On the basis, the liquid crystal box filled with the display material obtained by adding the additive with the content not higher than 0.2 percent has virtually unchanged various performances.
On the other hand, the host mixtures of example 1 and comparative example 1 were mixed with the compound of formula III (m ═ 8) as an additive in an amount of 0.05% respectively, to thereby obtain display materials of example 1 and comparative example 1; meanwhile, the host mixture of example 1 was directly used as the display material of comparative example 2. Then, each display material was filled in the VA test cell.
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(%). Further, the display materials of example 1 and comparative examples 1 to 2 were each exposed to an ultraviolet lamp having a wavelength of 365nm and irradiated with 5000mJ energy, and then tested for their voltage holding ratio VHR after 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 | 99.80 | 99.77 |
| Comparative example 1 | 99.65 | 99.48 |
| Comparative example 2 | 99.80 | 97.63 |
As can be seen from table 2, the liquid crystal cell of example 1 of the present invention has higher reliability against ultraviolet light irradiation than comparative examples 1-2.
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 (15)
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 is composed of at least one compound of formula I, at least one compound of formula II, at least one compound of formula III, a compound of formula IV, a compound of formula V, a compound of formula VI and a compound of formula VII,
wherein R1 and R2 each independently represent an alkyl or alkoxy group of 1 to 8 carbon atoms;
wherein R3 represents an alkenyl group of 2 to 8 carbon atoms; r4 represents an alkyl or alkoxy group of 1 to 8 carbon atoms;
wherein R5 and R6 each independently represent an alkyl or alkoxy group of 1 to 8 carbon atoms;
wherein R7 represents an alkenyl group of 2 to 8 carbon atoms; r8 represents an alkyl or alkoxy group of 1 to 8 carbon atoms; ring A represents
Wherein R9 represents an alkyl or alkoxy group of 1 to 8 carbon atoms; r10 represents an alkenyl group of 2 to 8 carbon atoms;
wherein R11 represents an alkenyl group of 2 to 8 carbon atoms; r12 represents an alkyl or alkoxy group of 1 to 8 carbon atoms;
wherein R13 and R14 each independently represent an alkyl or alkoxy group of 1 to 8 carbon atoms;
the additive is selected from the group consisting of compounds of formula VIII,
wherein m is an integer of 6 to 10.
2. The automotive all-liquid crystal instrument panel according to claim 1, wherein R1 and R2 each independently represent an alkyl group or an alkoxy group of 1 to 6 carbon atoms; r3 represents an alkenyl group of 2 to 6 carbon atoms; r4 represents an alkyl or alkoxy group of 1 to 6 carbon atoms; r5 and R6 each independently represent an alkyl or alkoxy group having 1 to 6 carbon atoms.
3. The automotive all-liquid crystal instrument panel according to claim 1 or 2, wherein the content of the compound of formula I is 10-20%; the content of the compound of the formula II is 15-28%; the content of the compound of the formula III is 4-12%; based on the total weight of the display material.
4. The automobile full liquid crystal instrument panel according to claim 3, wherein the content of the compound of the formula I is 12-18%; the content of the compound of the formula II is 18-24%; the content of the compound of the formula III is 6-10%; based on the total weight of the display material.
5. The liquid crystal instrument panel for automobiles according to claim 1, wherein R13 and R14 each independently represent an alkyl group or an alkoxy group having 1 to 6 carbon atoms.
6. The automobile all-liquid-crystal instrument panel according to claim 5, wherein the content of the compound of the formula VII is 4-12%; based on the total weight of the display material.
7. The automobile all-liquid-crystal instrument panel according to claim 6, wherein the content of the compound of the formula VII is 6-10%; based on the total weight of the display material.
8. The automotive all-liquid crystal instrument panel according to claim 7, wherein R7 represents an alkenyl group having 2 to 6 carbon atoms; r8 represents an alkyl or alkoxy group of 1 to 6 carbon atoms.
9. The automotive all-liquid crystal instrument panel according to claim 8, wherein the content of the compound of formula IV is 4-8%; based on the total weight of the display material.
10. The automotive all-liquid crystal instrument panel according to claim 9, wherein the content of the compound of formula IV is 5-7%; based on the total weight of the display material.
11. The automotive all-liquid crystal instrument panel according to claim 10, wherein R9 represents an alkyl group or an alkoxy group having 1 to 6 carbon atoms; r10 represents an alkenyl group of 2 to 6 carbon atoms; r11 represents an alkenyl group of 2 to 6 carbon atoms; r12 represents an alkyl or alkoxy group of 1 to 6 carbon atoms.
12. The automotive all-liquid crystal instrument panel according to claim 11, wherein the content of the compound of formula V is 20-35%; and/or the compound of formula VI is 8-18%; based on the total weight of the display material.
13. The automotive all-liquid crystal instrument panel according to claim 12, wherein the content of the compound of formula V is 25-30%; and/or the compound of formula VI is in the range of 10-15%; based on the total weight of the display material.
14. The automotive all-liquid crystal instrument panel according to claim 13, wherein the additive is added in an amount of 0.005-0.2%; based on the total weight of the host mixture.
15. The automotive all-liquid crystal instrument panel according to claim 14, wherein the additive is added in an amount of 0.01-0.1%; based on the total weight of the host mixture.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1184395A (en) * | 1997-09-03 | 1999-03-26 | Canon Inc | Liquid crystal element and its production |
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| US7820072B2 (en) * | 2007-03-30 | 2010-10-26 | A U Optronics Corp. | Liquid crystalline medium and method for manufacturing liquid crystal display panel |
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Denomination of invention: A High Reliability Full LCD Instrument Panel Effective date of registration: 20221206 Granted publication date: 20220118 Pledgee: Shaoxing Branch of Bank of Hangzhou Co.,Ltd. Pledgor: ZHEJIANG AUTOMOBILE INSTRUMENT Co.,Ltd. Registration number: Y2022980025494 |
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