CN114265245A - Novel intelligent electric meter display device - Google Patents
Novel intelligent electric meter display device Download PDFInfo
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- CN114265245A CN114265245A CN202111365562.2A CN202111365562A CN114265245A CN 114265245 A CN114265245 A CN 114265245A CN 202111365562 A CN202111365562 A CN 202111365562A CN 114265245 A CN114265245 A CN 114265245A
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- 239000000758 substrate Substances 0.000 claims abstract description 42
- 150000001875 compounds Chemical class 0.000 claims abstract description 27
- 239000004642 Polyimide Substances 0.000 claims abstract description 9
- 229920001721 polyimide Polymers 0.000 claims abstract description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 93
- 125000000217 alkyl group Chemical group 0.000 claims description 58
- 125000003545 alkoxy group Chemical group 0.000 claims description 36
- 125000004183 alkoxy alkyl group Chemical group 0.000 claims description 33
- 125000003342 alkenyl group Chemical group 0.000 claims description 32
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 30
- 239000003963 antioxidant agent Substances 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 9
- -1 oxaalkyl Chemical group 0.000 claims description 8
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 206010047571 Visual impairment Diseases 0.000 abstract description 17
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 150000001721 carbon Chemical group 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 125000001140 1,4-phenylene group Chemical group [H]C1=C([H])C([*:2])=C([H])C([H])=C1[*:1] 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 125000005055 alkyl alkoxy group Chemical group 0.000 description 1
- 125000005742 alkyl ethenyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 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 description 1
- 125000005407 trans-1,4-cyclohexylene group Chemical group [H]C1([H])C([H])([H])[C@]([H])([*:2])C([H])([H])C([H])([H])[C@@]1([H])[*:1] 0.000 description 1
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- Liquid Crystal Substances (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The display device comprises a first substrate and a second substrate, wherein a common electrode and a pixel electrode are respectively manufactured on the inner sides of the first substrate and the second substrate, polyimide PI alignment layers are formed on the opposite sides of the common electrode and the pixel electrode, and a display medium is filled between the first substrate and the second substrate; the display medium comprises one or more compounds of formula I, and one or more compounds of formula II. The display device not only has excellent VHR characteristics; and has good afterimage characteristics, thereby enhancing the reliability characteristics of the display device.
Description
Technical Field
The invention belongs to the technical field of intelligent electric meters, and particularly relates to a novel intelligent electric meter display device.
Background
Along with the rise and development of smart grids, in order to meet the demand of society on electric power measurement and ensure the safety and convenience of using electric power energy by power consumers, China speeds up the pace of modifying the traditional electric meters (induction type mechanical electric meters). Based on the background, the intelligent electric meter has come to the end, and different from the traditional electric energy meter, the intelligent electric meter not only has basic functions of metering, data storage and the like, but also has various advanced functions of power failure meter reading, recording of various indexes, stepped calculation of electric charge, price control, remote control and the like. The system can coordinate the supply and demand relationship between the user and the intelligent power grid while providing the power consumption and the power utilization time for the consumer.
The smart electric meter generally adopts a Liquid Crystal Display (LCD) to display in a full interface, and the display mode includes automatic cycle display and key display. The display content comprises the parameters of the electricity consumption, the total electricity consumption, the electricity meter number, the current time, the current voltage, the current, the active power, the power factor and the electricity meter in the month, and simultaneously displays the information of the current date, the current time, the electricity consumption unit price, the residual amount, the communication address, the communication alarm state and the like. The driving circuit is driven by a special liquid crystal driving chip, and the driving chip is connected with the single chip microcomputer through an I2C bus.
However, the whole digitization degree of the existing intelligent electric meter is not high, a TN or STN display device with a passive matrix electrode structure is mostly adopted, the display device is generally divided into a plurality of display parts, the content displayed by each part is single, the amount of provided data information is small, a large amount of fixed space is occupied, the function is single, the expandability is poor, and the display requirement of the existing electricity utilization information cannot be met.
With the continuous development of liquid crystal technology, the liquid crystal screen greatly reduces the cost while improving the performance. Therefore, the medium-small size TFT display screen is used for replacing the traditional TN (twisted nematic) or STN (super twisted nematic) display device, so that the display color and information are richer, more flexible and changeable, and the response speed is improved. Therefore, a combination instrument platform adopting a TFT display screen and a high-performance ARM processor has become a development direction of the smart meter. The intelligent electric meter has the characteristics of high processing speed, low price, rich control interfaces and simple peripheral circuits, effectively reduces the cost and can meet the requirements of various users.
As the TFT display panel, not only TN-TFT and STN-TFT which have been further developed in conventional TN or STN display devices but also VA-TFT (vertical alignment), IPS-TFT (in-plane switching), FFS-TFT (fringe field switching) and the like are included.
Among them, the VA-TFT mode has the advantages of a super wide viewing angle, a fast response speed, and a very high front contrast, and thus becomes a liquid crystal display technology with great prospect. In contrast to conventional display modes, the VA-TFT mode, which employs a vertical alignment technique, requires a display medium having negative dielectric anisotropy. However, the negative liquid crystal monomer has a molecular structure itself, and therefore, it contains a large amount of ionic impurities, and is more likely to be decomposed and destroyed under ultraviolet irradiation and high temperature environment than a positive display medium, and further causes an increase in ionic impurities, which results in deterioration of reliability characteristics of a VA-TFT mode display medium. It is generally accepted that the Voltage Holding Ratio (VHR) of a display medium is an important parameter for characterizing the reliability characteristics of the display medium; the latter has a strong correlation with the afterimage (especially the line afterimage) of the display screen.
On the other hand, in order to prevent the VA-TFT display device from maintaining a large voltage holding ratio in the vicinity of the upper limit temperature of the nematic phase after a long time operation, an antioxidant is generally added to the display medium. Commonly used antioxidants include hindered phenolic and hindered amine antioxidants. However, these antioxidants may leave ionic impurities after the display device is formed, which do not contribute to the improvement of the voltage holding ratio, and the ionic impurities move in a plane along the electric field of the VA-TFT display device and are collected in the vicinity of the pixel electrode and the common electrode, and the collected region is easily observed as an afterimage on the outside.
Therefore, in view of the above-mentioned drawbacks of the prior art, there is a need to provide a novel smart meter display device having better display medium reliability characteristics, particularly, excellent VHR characteristics and afterimage characteristics.
Disclosure of Invention
The invention aims to provide a novel intelligent electric meter display device.
In order to solve the technical problems, the invention adopts the following technical scheme: a novel intelligent electric meter display device comprises a first substrate and a second substrate, wherein a public electrode and a pixel electrode are respectively manufactured on the inner sides of the first substrate and the second substrate, then polyimide PI alignment layers are formed on the opposite sides of the public electrode and the pixel electrode, and a display medium is filled between the first substrate and the second substrate; the display medium comprises one or more compounds of formula I,
and, one or more compounds of formula II,
wherein the content of the first and second substances,
R1-R2each independently represents an alkyl, alkoxy, oxaalkyl, alkoxyalkyl group having 1 to 9 carbon atoms,
alternatively, the first and second electrodes may be,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
ring A represents
Or
。
In the present invention, the alkylalkoxy, oxaalkyl, alkoxyalkyl, alkenyl or alkenyloxy group may be linear or branched, preferably linear.
In the present invention, in the case of the present invention,
represents trans-1, 4-cyclohexylene (ring);
represents a 1, 4-phenylene group (ring).
In the present invention, alkyl represents CnH2n+1-a group of (a); alkoxy represents CnH2n+1A group of O-; oxaalkyl represents CnH2n+1A group ofLess than 1 CH2A group in which the group is replaced with an O atom; alkoxyalkyl represents CnH2n+1OCmH2m+1-a group of (a); alkenyl represents CnH2n+1The radical of (A) has at least 1 CH2Groups substituted with CH = CH atoms; alkenyloxy represents a group having an alkenyl-linking end of O.
Preferably, R1-R2Each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 7 carbon atoms.
More preferably, R1-R2Each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms.
And the number of the first and second groups,
most preferably, R1-R2Each independently represents an alkyl group having 1 to 3 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 3 carbon atoms.
In a further preferred embodiment, R1-R2Each independently represents an alkyl or alkoxy group having 1 to 3 carbon atoms.
In a more preferred embodiment, R2Each independently represents a linear or branched alkyl group having 1 to 3 carbon atoms.
In one embodiment, R2Each independently represents a straight chain alkyl group having 3 carbon atoms.
The display device according to the present invention, wherein the compound of formula I is present in an amount of 4-12%, preferably 5-11%, more preferably 6-10%, and most preferably 7-9%; the compound of formula II is present in an amount of 13-23%, preferably 14-22%, more preferably 15-21%, and most preferably 16-20%; based on the total weight of the display medium.
The display device according to the present invention, wherein the display medium further comprises one or more antioxidants of the following formula,
wherein r represents an integer of 1 to 10.
The display device according to the present invention, wherein r = 8.
The display device according to the present invention, wherein the antioxidant is contained in an amount of 0.01 to 0.1%, preferably 0.02 to 0.08%, more preferably 0.03 to 0.07%, and most preferably 0.04 to 0.06%; based on the total weight of the display medium.
The display device according to the present invention, wherein the dielectric anisotropy value Δ ∈ of the display medium is between-2 and-4.
The display device according to the present invention, wherein the total content of the liquid crystal monomer compounds having the negative dielectric anisotropy value Δ ∈ in the display medium is 36 to 52%, preferably 38 to 50%, more preferably 40 to 48%, and most preferably 42 to 46%; based on the total weight of the display medium.
The display device of the invention, wherein the impedance of the polyimide PI alignment layer is (2-9) multiplied by 1015Omega cm; preferably (3-8). times.1015Omega cm; more preferably (4-7). times.1015Omega cm; and most preferably (5-6). times.1015Ω·cm。
The display device of the invention, wherein the thickness of the display medium is 2.8-3.8 μm; preferably 3-3.5 μm.
The display device according to the present invention, wherein the display medium further comprises a compound of formula II-1 and formula II-2,
wherein R is2Each independently represents the aforementioned definition as well as the aforementioned preferred definition according to the invention.
In a further preferred embodiment, R2Each independently represents an alkyl or alkoxy group having 1 to 3 carbon atoms.
In a more preferred embodiment, R2Each independently represents a linear or branched alkyl group having 1 to 3 carbon atoms.
In one embodiment, R2Each independently represents a straight chain alkyl group having 3 carbon atoms.
The display device according to the present invention, wherein the compound of formula II-1 is contained in an amount of 8 to 12%, preferably 8.5 to 11.5%, more preferably 9 to 11%, and most preferably 9.5 to 10.5%; the compound of formula II-2 is present in an amount of 6-10%, preferably 6.5-9.5%, more preferably 7-9%, and most preferably 7.5-8.5%; based on the total weight of the display medium.
The display device according to the present invention, wherein the display medium further comprises a compound of formula III,
wherein R is3-R4Each independently represents an alkyl, alkoxy, oxaalkyl, alkoxyalkyl group having 1 to 9 carbon atoms,
alternatively, the first and second electrodes may be,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
m represents 0 or 1.
Preferably, R3-R4Each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 7 carbon atoms.
More preferably, R3-R4Each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 5 carbon atoms.
And the number of the first and second groups,
most preferably, R3-R4Each independently represents an alkyl group having 1 to 3 carbon atomsAlkoxy, oxaalkyl, alkoxyalkyl, or alkenyl or alkenyloxy having 2 to 3 carbon atoms.
In a further preferred embodiment, R3Represents an alkyl group having 1 to 3 carbon atoms, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group having 2 to 3 carbon atoms; r4Represents an alkoxy group having 1 to 3 carbon atoms, or an alkenyloxy group having 2 to 3 carbon atoms.
In a more preferred embodiment, R3Represents a linear or branched alkyl group having 1 to 3 carbon atoms; r4Represents a linear or branched alkoxy group having 1 to 3 carbon atoms.
In one embodiment, R3Represents a straight-chain alkyl group having 3 carbon atoms; r4Represents an alkoxy group having 2 carbon atoms.
The display device according to the present invention, wherein the compound of formula III is contained in an amount of 10 to 18%, preferably 11 to 17%, more preferably 12 to 16%, and most preferably 13 to 15%; based on the total weight of the display medium.
The display device according to the present invention, wherein the display medium further comprises a compound of formula IV,
wherein R is5-R6Each independently represents an alkyl, alkoxy, oxaalkyl, alkoxyalkyl group having 1 to 9 carbon atoms,
alternatively, the first and second electrodes may be,
alkenyl or alkenyloxy having 2 to 9 carbon atoms.
Preferably, R5-R6Each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 7 carbon atoms.
More preferably, R5-R6Each independently represents an alkyl group, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group having 1 to 5 carbon atoms, or has 2 to 5Alkenyl or alkenyloxy of 5 carbon atoms.
And the number of the first and second groups,
most preferably, R5-R6Each independently represents an alkyl group having 1 to 3 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 3 carbon atoms.
In a further preferred embodiment, R5Represents an alkyl group having 1 to 3 carbon atoms, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group having 2 to 3 carbon atoms; r6Represents an alkoxy group having 1 to 3 carbon atoms, or an alkenyloxy group having 2 to 3 carbon atoms.
In a more preferred embodiment, R5Represents a linear or branched alkyl group having 1 to 3 carbon atoms; r6Represents a linear or branched alkoxy group having 1 to 3 carbon atoms.
In one embodiment, R5Represents a straight chain alkyl group of 3 carbon atoms; r6Represents a linear alkoxy group of 2 carbon atoms.
The display device according to the present invention, wherein the compound of formula IV is contained in an amount of 0 to 8%, preferably 1 to 7%, more preferably 2 to 6%, and most preferably 3 to 5%; based on the total weight of the display medium.
The display device according to the present invention, wherein the display medium further comprises a compound of formula V,
wherein R is7-R8Each independently represents an alkyl, alkoxy, oxaalkyl, alkoxyalkyl group having 1 to 9 carbon atoms,
alternatively, the first and second electrodes may be,
alkenyl or alkenyloxy having 2 to 9 carbon atoms.
Preferably, R7-R8Each independently represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 8 carbon atoms.
More preferably, R7-R8Each independently represents an alkyl group having 1 to 6 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 6 carbon atoms.
And the number of the first and second groups,
most preferably, R7-R8Each independently represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 4 carbon atoms.
In a further preferred embodiment, R7-R8Each independently represents an alkyl group having 1 to 4 carbon atoms, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group having 2 to 4 carbon atoms.
In a more preferred embodiment, R7-R8Each independently represents a linear or branched alkyl group having 1 to 4 carbon atoms.
In one embodiment, R7Represents a straight chain alkyl group of 3 carbon atoms; r8Represents a linear alkyl group of 2 carbon atoms.
In another embodiment, R7Represents a straight chain alkyl group of 4 carbon atoms; r8Represents a straight-chain alkyl group of 3 carbon atoms.
The display device according to the present invention, wherein the compound of formula V is present in an amount of 22-32%, preferably 23-31%, more preferably 24-30%, and most preferably 25-29%; based on the total weight of the display medium.
The display device according to the present invention, wherein the display medium further comprises a compound of formula VI,
wherein R is9-R10Each independently represents an alkyl, alkoxy, oxaalkyl, alkoxyalkyl group having 1 to 9 carbon atoms,
alternatively, the first and second electrodes may be,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
ring B represents
Or
。
Preferably, R9-R10Each independently represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 8 carbon atoms.
More preferably, R9-R10Each independently represents an alkyl group having 1 to 6 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 6 carbon atoms.
And the number of the first and second groups,
most preferably, R9-R10Each independently represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 4 carbon atoms.
In a further preferred embodiment, R9-R10Each independently represents an alkyl group having 1 to 4 carbon atoms, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group having 2 to 4 carbon atoms.
In a more preferred embodiment, R9-R10Each independently represents a linear or branched alkyl group having 1 to 4 carbon atoms.
In one embodiment, R9Represents a straight chain alkyl group of 3 carbon atoms; r10Represents an alkyl group having 1 carbon atom.
In another embodiment, R9Represents a straight chain alkyl group of 3 carbon atoms; r10Represents an alkyl group of 2 carbon atoms.
The display device according to the present invention, wherein the compound of formula VI is present in an amount of 15-25%, preferably 16-24%, more preferably 17-23%, and most preferably 18-22%; based on the total weight of the display medium.
The display device according to the invention, wherein the display medium further comprises a compound of formula VII,
wherein R is11-R12Each independently represents an alkyl, alkoxy, oxaalkyl, alkoxyalkyl group having 1 to 9 carbon atoms,
alternatively, the first and second electrodes may be,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
ring C represents
Or
。
Preferably, R11-R12Each independently represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 8 carbon atoms.
More preferably, R11-R12Each independently represents an alkyl group having 1 to 6 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 6 carbon atoms.
And the number of the first and second groups,
most preferably, R11-R12Each independently represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 4 carbon atoms.
In a further preferred embodiment, R11Represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group or an alkenyloxy group having 2 to 4 carbon atoms; r12Represents an alkyl group having 1 to 4 carbon atoms, an oxaalkyl group, an alkoxyalkyl group, or an alkenyl group having 2 to 4 carbon atoms.
In a more preferred embodiment, R11Represents a linear or branched alkyl or alkoxy group having 1 to 4 carbon atoms; r12Represents a linear or branched alkyl group having 1 to 4 carbon atoms.
In one embodiment, R11Represents a straight chain alkyl group of 3 carbon atoms; r12Represents an alkyl group having 1 carbon atom.
In another embodiment, R11Represents a straight chain alkyl group of 3 carbon atoms; r12Represents an alkoxy group of 2 carbon atoms.
The display device according to the present invention, wherein the compound of formula VII is present in an amount of 5-13%, preferably 6-12%, more preferably 7-11%, and most preferably 8-10%; based on the total weight of the display medium.
Without wishing to be bound by any theory, the novel smart meter display device of the present invention not only has excellent VHR properties (VHR > 99.3) due to the use of specific compounds of formula I and specific II and specific antioxidants; and has good afterimage characteristics, thereby enhancing the reliability characteristics of the display device.
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, the liquid crystal compound is represented using an abbreviated form of cyclic unit + linker + terminal group.
Table 1: ring unit
C=
；
P=
；
Y=
；
In=
。
Table 2: connection unit
1O=-CH2-O-；
2=-CH2-CH2-；
Q=-CF2-O-；
Z=-CO-O-；
V=-CH=CH-。
Table 3: terminal group
Left terminal n- = CnH2n+1-; right terminal-n = -CnH2n+1；
Left terminal group nO- = OCnH2n+1-; right terminal-On = -OCnH2n+1；
Left terminal group F- = F-; right end-F = -F;
left end group H- = H-; right end-H = -H;
left terminal group V- = CH2= CH-; right terminal-V = -CH = CH2；
Left terminal group nV- = CnH2n+1-CH = CH-; right terminal-Vn = -CH = CH-CnH2n+1。
In the present invention, all parts are parts by weight unless otherwise specified; all percentages are by weight; the temperature units are in ℃.
Δ n represents the optical anisotropy values at 25 ° and 589 nm;
Δ ε represents a value of dielectric anisotropy at 25 ℃ and 1 kHz;
γ1represents the rotational viscosity (mPa · s) measured at 25 ℃;
cp denotes a clearing point.
VHR is measured by applying a square wave electric field of 5V and 60Hz at the temperature of 60 ℃ in a VA mode display device; VHR = ratio (%) of measured voltage to initial applied voltage.
Afterimage evaluation a 4 × 4 black-and-white checkerboard screen of 500h was displayed in a fixed manner in the display area, and evaluation was performed on the following 4 levels by observing the afterimage level.
Level 1 = no afterimage;
level 2 = slightly afterimage but allowable level;
level 3 = afterimage and is not allowable level;
level 4 = afterimage and quite poor.
Example 1
A display device of smart meter comprises a first substrate and a second substrate, wherein a common electrode and a pixel electrode are respectively formed on the inner sides of the first substrate and the second substrate, and a polyimide PI alignment layer (impedance of 5.4 × 10) is formed on the opposite sides of the common electrode and the pixel electrode15Ω · cm), and a display medium is filled between the first substrate and the second substrate; the thickness of the display medium was 3.2 μm. The composition of the display medium is as follows:
3-CIn-F 8%
3-CCY-O2F 10%
3-CPY-O2F 8%
3-CC1OY-O2 6%
3-C1OY-O2 8%
3-PY-O2 4%
3-CC-2 14.95%
4-CC-3 12%
3-CCP-1 12%
3-CCP-1 4%
3-CPP-2 4%
3-PP-1 6%
3-CP-O2 3%
Δn=0.0984；Δε=-2.9；Cp=75.2；γ1=91。
VHR = 99.8; afterimage level 1.
Comparative example 1
A display device of an intelligent electric meter comprises a first substrate and a second substrate, wherein the first substrate and the second substrate are internally provided with a display screenThe common electrode and the pixel electrode were formed on one side, and polyimide PI alignment layers (impedance of 5.4 × 10) were formed on the opposite sides15Ω · cm), and a display medium is filled between the first substrate and the second substrate; the thickness of the display medium was 3.2 μm. The composition of the display medium is as follows:
3-CIn-F 8%
3-CCY-O2 10%
3-CPY-O2 8%
3-CC1OY-O2 6%
3-C1OY-O2 8%
3-PY-O2 4%
3-CC-2 14.95%
4-CC-3 12%
3-CCP-1 12%
3-CCP-1 4%
3-CPP-2 4%
3-PP-1 6%
3-CP-O2 3%
Δn=0.102；Δε=-2.8；Cp=76.9；γ1=94。
VHR = 98.7; afterimage level 2.
Comparative example 2
A display device of smart meter comprises a first substrate and a second substrate, wherein a common electrode and a pixel electrode are respectively formed on the inner sides of the first substrate and the second substrate, and a polyimide PI alignment layer (impedance of 5.4 × 10) is formed on the opposite sides of the common electrode and the pixel electrode15Ω · cm), and a display medium is filled between the first substrate and the second substrate; the thickness of the display medium was 3.2 μm. The composition of the display medium is as follows:
3-CIn-H 8%
3-CCY-O2F 10%
3-CPY-O2F 8%
3-CC1OY-O2 6%
3-C1OY-O2 8%
3-PY-O2 4%
3-CC-2 14.95%
4-CC-3 12%
3-CCP-1 12%
3-CCP-1 4%
3-CPP-2 4%
3-PP-1 6%
3-CP-O2 3%
Δn=0.0989；Δε=-2.7；Cp=75.2；γ1=91。
VHR = 99.3; afterimage level 1.
Comparative example 3
A display device of smart meter comprises a first substrate and a second substrate, wherein a common electrode and a pixel electrode are respectively formed on the inner sides of the first substrate and the second substrate, and a polyimide PI alignment layer (impedance of 5.4 × 10) is formed on the opposite sides of the common electrode and the pixel electrode15Ω · cm), and a display medium is filled between the first substrate and the second substrate; the thickness of the display medium was 3.2 μm. The composition of the display medium is as follows:
3-CIn-F 8%
3-CCY-O2F 10%
3-CPY-O2F 8%
3-CC1OY-O2 6%
3-C1OY-O2 8%
3-PY-O2 4%
3-CC-2 14.95%
4-CC-3 12%
3-CCP-1 12%
3-CCP-1 4%
3-CPP-2 4%
3-PP-1 6%
3-CP-O2 3%
Δn=0.0984；Δε=-2.9；Cp=75.2；γ1=91。
VHR = 98.9; afterimage level 2.
It can be seen that the novel smart meter display device of example 1 of the present invention not only has excellent VHR characteristics (VHR > 99.3; but also has good afterimage characteristics, while comparative examples 1-3 fail to achieve excellent technical effects in both aspects.
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 display device of a smart meter comprises a first substrate and a second substrate, wherein a common electrode and a pixel electrode are respectively manufactured on the inner sides of the first substrate and the second substrate, polyimide PI alignment layers are formed on the opposite sides of the common electrode and the pixel electrode, and a display medium is filled between the first substrate and the second substrate; the display medium comprises one or more compounds of formula I,
and, one or more compounds of formula II,
wherein the content of the first and second substances,
R1-R2each independently represents an alkyl, alkoxy, oxaalkyl, alkoxyalkyl group having 1 to 9 carbon atoms,
alternatively, the first and second electrodes may be,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
ring A represents
Or
。
2. The display device of claim 1, wherein the compound of formula I is present in an amount of 4-12%; the content of the compound of the formula II is 13-23%; based on the total weight of the display medium.
3. A display device according to claim 1 or 2, wherein the display medium further comprises one or more antioxidants of the formula,
wherein r represents an integer of 1 to 10.
4. A display device according to claim 3, wherein r = 8.
5. A display device according to claim 3 or 4, wherein the antioxidant is present in an amount of 0.01-0.1%; based on the total weight of the display medium.
6. A display device according to any one of claims 1-5, wherein the value of the dielectric anisotropy Δ ε of the display medium is between-2 and-4.
7. The display device according to any one of claims 1 to 6, wherein the total content of the liquid crystal monomer compounds having a negative dielectric anisotropy value Δ ∈ in the display medium is 36 to 52%; based on the total weight of the display medium.
8. The display device of any one of claims 1-7, wherein the polyimide PI alignment layer has a resistance of (2-9) x 1015Ω·cm。
9. The display device according to any one of claims 1 to 8, wherein the thickness of the display medium is 2.8 to 3.8 μm.
10. The display device of any one of claims 1-9, wherein the display medium further comprises a compound of formula II-1 and formula II-2,
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