CN114265245B - Smart electric meter display device - Google Patents
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- CN114265245B CN114265245B CN202111365562.2A CN202111365562A CN114265245B CN 114265245 B CN114265245 B CN 114265245B CN 202111365562 A CN202111365562 A CN 202111365562A CN 114265245 B CN114265245 B CN 114265245B
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- 239000000758 substrate Substances 0.000 claims abstract description 54
- 150000001875 compounds Chemical class 0.000 claims abstract description 22
- 239000004642 Polyimide Substances 0.000 claims abstract description 8
- 229920001721 polyimide Polymers 0.000 claims abstract description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 11
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 206010047571 Visual impairment Diseases 0.000 abstract description 14
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 91
- 125000000217 alkyl group Chemical group 0.000 description 55
- 125000003545 alkoxy group Chemical group 0.000 description 35
- 125000003342 alkenyl group Chemical group 0.000 description 33
- 125000004183 alkoxy alkyl group Chemical group 0.000 description 32
- 125000003302 alkenyloxy group Chemical group 0.000 description 29
- 230000005611 electricity Effects 0.000 description 9
- 239000003963 antioxidant agent Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- -1 oxaalkyl Chemical group 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 2
- 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
- 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
- 230000006978 adaptation Effects 0.000 description 1
- 125000005055 alkyl alkoxy group Chemical group 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 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
- 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
- 230000000630 rising effect Effects 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
Abstract
The utility model discloses a smart meter display device, which 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, then polyimide PI alignment layers are formed on the opposite sides of the first substrate and the second substrate, 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; meanwhile, the display device 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 an intelligent electric meter display device.
Background
With the rising and development of smart power grids, in order to meet the requirements of society on electric power metering, the safety and convenience of using electric power energy sources by electricity consumers are guaranteed, and the improvement of traditional electric meters (induction type mechanical electric meters) is quickened in China. Based on the background, the intelligent ammeter has basic functions of metering, data storage and the like, and can perform various advanced functions of power failure meter reading, recording various indexes, electric charge ladder calculation, price control, remote control and the like, unlike the traditional electric energy meter. And the supply and demand relationship between the user and the intelligent power grid can be coordinated while the electricity consumption and the electricity consumption time are provided for the consumer.
The smart meter generally adopts a liquid crystal display (liquid crystal display, LCD) full-interface display, and the display mode comprises automatic circulation display and key display. The display content comprises the electricity consumption of the month, the total electricity consumption, the electricity meter number, the current time, the current voltage, the current, the active power, the power factor, and other electricity meter parameters, and simultaneously displays the information such as the current date, the time, the electricity unit price, the residual amount, the communication address, the communication alarm state and the like. The driving chip is connected with the singlechip through an I2C bus.
However, the whole digitization degree of the current intelligent ammeter is not high, a TN or STN display device with a passive matrix electrode structure is generally divided into a plurality of display parts, the content displayed by each part is single, the provided data information amount is small, a large amount of fixed space is occupied, the function is single, the expandability is poor, and the display requirement of the current electricity information cannot be met.
With the continuous development of liquid crystal technology, the liquid crystal display greatly reduces the cost while improving the performance. Therefore, the medium-small size TFT display screen is used to replace the traditional TN (twisted nematic) or STN (super twisted nematic) display device, so that the display color and information are more abundant, 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 the development direction of the intelligent electric meter. The intelligent ammeter has the characteristics of high processing speed, low price, rich control interfaces and simple peripheral circuits, effectively reduces the cost and can meet the needs of various users.
As TFT display panels, not only TN-TFTs and STN-TFTs, which have been further developed in conventional TN or STN display devices, but also VA-TFTs (vertical alignment), IPS-TFTs (in-plane switching), FFS-TFTs (fringe field switching), and the like are included.
Among them, the VA-TFT mode is a promising liquid crystal display technology due to its advantages of ultra-wide viewing angle, fast response speed, and very high front contrast. The VA-TFT mode employs a vertical alignment technique, which requires a display medium having negative dielectric anisotropy, compared to the conventional display mode. However, due to the molecular structure of the negative liquid crystal monomer, the ionic impurities contained in the negative liquid crystal monomer are more, and meanwhile, the negative liquid crystal monomer is more easily decomposed and destroyed under the conditions of ultraviolet irradiation and high temperature than a positive display medium, and further, the ionic impurities are increased, so that the reliability characteristics of the VA-TFT mode display medium are poor. It is generally believed that the Voltage Holding Ratio (VHR) of the display medium is an important parameter 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 around the upper limit temperature of the nematic phase after a long period of operation, an antioxidant is generally added to the display medium. Commonly used antioxidants include hindered phenolic and hindered aminic antioxidants. However, these antioxidants may remain ionic impurities after the formation of the display device, and not only do not contribute to improvement of the voltage holding ratio, but also the ionic impurities are moved in plane along the electric field of the VA-TFT display device, and accumulate near the pixel electrode and the common electrode, and the accumulated region is easily observed as a ghost outside.
Accordingly, in view of the above-described drawbacks of the prior art, there is a need to provide a novel smart meter display device having better reliability characteristics of a display medium, particularly excellent VHR characteristics and afterimage characteristics.
Disclosure of Invention
The invention aims to provide a display device of a smart electric meter.
In order to solve the technical problems, the invention adopts the following technical scheme: 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 first substrate and the second substrate, 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 the formula II,
II；
wherein,
R 1 -R 2 each independently represents having 1 to 9Alkyl, alkoxy, oxaalkyl, alkoxyalkyl having carbon atoms,
or,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
ring A representsOr->。
In the present invention, the alkylalkoxy, oxaalkyl, alkoxyalkyl, alkenyl or alkenyloxy group may be linear or branched, preferably linear.
In the present invention,represents trans-1, 4-cyclohexylene (ring); />Represents a 1, 4-phenylene group (ring).
In the present invention, alkyl represents C n H 2n+1 -a group; alkoxy represents C n H 2n+1 A group of O-; oxaalkyl represents C n H 2n+1 The radical of the formula-has at least 1 CH 2 A group in which the group is replaced with an O atom; alkoxyalkyl represents C n H 2n+1 OC m H 2m+1 -a group; alkenyl group represents C n H 2n+1 The radical of the formula-has at least 1 CH 2 A group in which the group is replaced with a ch=ch atom; alkenyloxy represents a group with an alkenyl linkage of O.
Preferably, R 1 -R 2 Each 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, R 1 -R 2 Each 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.
The method comprises the steps of,
most preferably, R 1 -R 2 Each 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, R 1 -R 2 Each independently represents an alkyl group or an alkoxy group having 1 to 3 carbon atoms.
In a more preferred embodiment, R 2 Each independently represents a linear or branched alkyl group having 1 to 3 carbon atoms.
In one embodiment, R 2 Each independently represents a straight chain alkyl group having 3 carbon atoms.
The display device according to the 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 invention, wherein the display medium further comprises one or more antioxidants of the 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 invention, wherein the display medium has a dielectric anisotropy value delta epsilon of between-2 and-4.
The display device according to the present invention, wherein the total content of the liquid crystal monomer compounds having a negative dielectric anisotropy value Δε in the display medium is 36-52%, preferably 38-50%, more preferably 40-48%, and most preferably 42-46%; based on the total weight of the display medium.
The display device according to the present invention, wherein the polyimide PI alignment layer has an impedance of (2-9). Times.10 15 Omega cm; preferably (3-8). Times.10 15 Omega cm; more preferably (4-7). Times.10 15 Omega cm; most preferably (5-6). Times.10 15 Ω·cm。
The display device according to the present 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 compounds of formula II-1 and formula II-2,
II-1；
II-2；
wherein R is 2 Each independently represents a definition as defined above and a preferred definition as defined above according to the invention.
In a further preferred embodiment, R 2 Each independently represents an alkyl group or an alkoxy group having 1 to 3 carbon atoms.
In a more preferred embodiment, R 2 Each independently represents a linear or branched alkyl group having 1 to 3 carbon atoms.
In one embodiment, R 2 Each 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 content of the compound of formula II-2 is 6 to 10%, preferably 6.5 to 9.5%, more preferably 7 to 9%, and most preferably 7.5 to 8.5%; 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 III,
III；
wherein R is 3 -R 4 Each independently represents an alkyl group having 1 to 9 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group,
or,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
m represents 0 or 1.
Preferably, R 3 -R 4 Each 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, R 3 -R 4 Each 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.
The method comprises the steps of,
most preferably, R 3 -R 4 Each 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, R 3 Represents 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; r is R 4 Represents an alkoxy group having 1 to 3 carbon atoms or an alkenyloxy group having 2 to 3 carbon atoms.
In a more preferred embodiment, R 3 Represents a linear or branched alkyl group having 1 to 3 carbon atoms; r is R 4 Represents a linear or branched alkoxy group having 1 to 3 carbon atoms.
In one embodiment, R 3 Represents a straight chain alkyl group having 3 carbon atoms; r is R 4 Represents an alkoxy group having 2 carbon atoms.
The display device according to the present invention, wherein the compound of formula III is present in an amount of 10-18%, preferably 11-17%, more preferably 12-16%, and most preferably 13-15%; 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 IV,
IV；
wherein R is 5 -R 6 Each independently represents an alkyl group having 1 to 9 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group,
or,
alkenyl or alkenyloxy having 2 to 9 carbon atoms.
Preferably, R 5 -R 6 Each 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, R 5 -R 6 Each 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.
The method comprises the steps of,
most preferably, R 5 -R 6 Each 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, R 5 Represents 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; r is R 6 Represents an alkoxy group having 1 to 3 carbon atoms or an alkenyloxy group having 2 to 3 carbon atoms.
In a more preferred embodiment, R 5 Represents a linear or branched alkyl group having 1 to 3 carbon atoms; r is R 6 Represents a linear or branched alkoxy radical having 1 to 3 carbon atomsA base.
In one embodiment, R 5 Represents a straight chain alkyl group of 3 carbon atoms; r is R 6 Represents 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 invention, wherein the display medium further comprises a compound of formula V,
V；
wherein R is 7 -R 8 Each independently represents an alkyl group having 1 to 9 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group,
or,
alkenyl or alkenyloxy having 2 to 9 carbon atoms.
Preferably, R 7 -R 8 Each 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, R 7 -R 8 Each 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.
The method comprises the steps of,
most preferably, R 7 -R 8 Each 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, R 7 -R 8 Each 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, R 7 -R 8 Each independently represents a linear or branched alkyl group having 1 to 4 carbon atoms.
In one embodiment, R 7 Represents a straight chain alkyl group of 3 carbon atoms; r is R 8 Represents a straight chain alkyl group of 2 carbon atoms.
In another embodiment, R 7 Represents a linear alkyl group of 4 carbon atoms; r is R 8 Represents 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 invention, wherein the display medium further comprises a compound of formula VI,
VI；
wherein R is 9 -R 10 Each independently represents an alkyl group having 1 to 9 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group,
or,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
ring B representsOr->。
Preferably, R 9 -R 10 Each 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, R 9 -R 10 Each 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.
The method comprises the steps of,
most preferably, R 9 -R 10 Each 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, R 9 -R 10 Each 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, R 9 -R 10 Each independently represents a linear or branched alkyl group having 1 to 4 carbon atoms.
In one embodiment, R 9 Represents a straight chain alkyl group of 3 carbon atoms; r is R 10 Represents an alkyl group having 1 carbon atom.
In another embodiment, R 9 Represents a straight chain alkyl group of 3 carbon atoms; r is R 10 Represents an alkyl group of 2 carbon atoms.
The display device according to the 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,
VII；
wherein R is 11 -R 12 Each independently represents an alkyl group having 1 to 9 carbon atoms, an alkoxy group, an oxaalkyl group, an alkoxyalkyl group,
or,
alkenyl or alkenyloxy having 2 to 9 carbon atoms;
ring C representsOr->。
Preferably, R 11 -R 12 Each 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, R 11 -R 12 Each 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.
The method comprises the steps of,
most preferably, R 11 -R 12 Each 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, R 11 Represents alkyl, alkoxy, oxaalkyl, alkoxyalkyl having from 1 to 4 carbon atoms, or alkenyl or alkenyloxy having from 2 to 4 carbon atoms; r is R 12 Represents alkyl, oxaalkyl, alkoxyalkyl having from 1 to 4 carbon atoms or alkenyl having from 2 to 4 carbon atoms.
In a more preferred embodiment, R 11 Represents a linear or branched alkyl or alkoxy group having 1 to 4 carbon atoms; r is R 12 Represents a linear or branched alkyl group having 1 to 4 carbon atoms.
In one embodiment, R 11 Represents a straight chain alkyl group of 3 carbon atoms; r is R 12 Represents an alkyl group having 1 carbon atom.
In another embodiment, R 11 Represents a straight chain alkyl group of 3 carbon atoms; r is R 12 An alkoxy group having 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 characteristics (VHR > 99.3) due to the use of specific compounds of formula I and II and specific antioxidants; meanwhile, the display device has good afterimage characteristics, thereby enhancing the reliability characteristics of the display device.
Detailed Description
The invention is further described below in conjunction with the detailed description.
It should be understood that the description of the specific embodiments is merely illustrative of the principles and spirit of the invention, and not in limitation thereof. Further, it should be understood that various changes, substitutions, omissions, modifications, or adaptations to the present invention may be made by those skilled in the art after having read the present disclosure, and such equivalent embodiments are within the scope of the present invention as defined in the appended claims.
In the present invention, the liquid crystal compound is represented by using an abbreviation of cyclic unit+linker+terminal group.
Table 1: annular unit
C=；
P=；
Y=；
In=。
Table 2: connection unit
1O=-CH 2 -O-；
2=-CH 2 -CH 2 -；
Q=-CF 2 -O-；
Z=-CO-O-；
V=-CH=CH-。
Table 3: end group
Left end group n- =c n H 2n+1 -; right end group-n= -C n H 2n+1 ；
Left end group nO- =oc n H 2n+1 -; right side end group-on= -OC n H 2n+1 ；
Left end group F- =f-; right end-f= -F;
left end group H- =h-; right end group-h= -H;
left end group V- =ch 2 =ch-; right end group-v= -ch=ch 2 ；
Left end group nV- =c n H 2n+1 -ch=ch-; right end group-vn= -ch=ch-C n H 2n+1 。
In the present invention, all parts are parts by weight unless otherwise specified; all percentages are by weight; the temperature unit is °c.
Δn represents an optical anisotropy value at 25 ° and 589 nm;
delta epsilon represents the dielectric anisotropy value at 25 ℃ and 1 kHz;
γ 1 represents the rotational viscosity (mpa·s) measured at 25 ℃;
cp represents a clearing point.
VHR is measured by applying a 5V and 60Hz square wave electric field at 60 ℃ in a VA mode display device; vhr=ratio (%) of measured voltage to initial applied voltage.
The image retention evaluation was performed by observing the image retention level by fixedly displaying a 4×4 black-and-white checkerboard screen for 500 hours in the display area, and evaluating the image retention level according to the following 4 steps.
Grade 1 = no afterimage;
level 2 = slightly afterimage but at an allowable level;
level 3 = afterimage and is a non-allowable level;
grade 4 = afterimage and quite bad.
Example 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 formed on the inner sides of the first substrate and the second substrate, and polyimide PI alignment layers (with impedance of 5.4X10 are formed on the opposite sides of the first substrate and the second substrate) 15 Omega cm), andand filling a display medium between the first substrate and the second substrate; the display medium thickness 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%
（r=8）0.05%。
Δn=0.0984；Δε=-2.9；Cp=75.2；γ 1 =91。
vhr=99.8; the afterimage level is 1 level.
Comparative example 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 formed on the inner sides of the first substrate and the second substrate, and polyimide PI alignment layers (with impedance of 5.4X10 are formed on the opposite sides of the first substrate and the second substrate) 15 Ω·cm), and filling a display medium between the first substrate and the second substrate; the display medium thickness 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%
（r=8）0.05%。
Δn=0.102；Δε=-2.8；Cp=76.9；γ 1 =94。
vhr=98.7; the afterimage level is 2.
Comparative example 2
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 formed on the inner sides of the first substrate and the second substrate, and polyimide PI alignment layers (with impedance of 5.4X10 are formed on the opposite sides of the first substrate and the second substrate) 15 Ω·cm), and filling a display medium between the first substrate and the second substrate; the display medium thickness 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%
（r=8）0.05%。
Δn=0.0989；Δε=-2.7；Cp=75.2；γ 1 =91。
vhr=99.3; the afterimage level is 1 level.
Comparative example 3
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 formed on the inner sides of the first substrate and the second substrate, and polyimide PI alignment layers (with impedance of 5.4X10 are formed on the opposite sides of the first substrate and the second substrate) 15 Ω·cm), and filling a display medium between the first substrate and the second substrate; the display medium thickness 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%
0.05%。
Δn=0.0984；Δε=-2.9；Cp=75.2；γ 1 =91。
vhr=98.9; the afterimage level is 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 of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (1)
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, and then polyimide PI alignment layers with impedance of 5.4X10 are formed on the opposite sides 15 Omega cm; and filling a display medium between the first substrate and the second substrate; the display medium thickness 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%；
，r=8 0.05%；
wherein the liquid crystal compound is represented by an abbreviated form of cyclic unit + linker + end group;
a ring unit:
C=；
P=；
Y=；
In=；
a connection unit:
1O=-CH 2 -O-；
end group:
left end group 3- =c 3 H 2×3+1 -；
Left end group 4- =c 4 H 2×4+1 -；
Right end group-1 = -C 1 H 2×1+1 ；
Right end group-2 = -C 2 H 2×2+1 ；
Right end group-3= -C 3 H 2×3+1 ；
Right end group-o2= -OC 2 H 2×2+1 ；
Right end group-O2F = -OC 2 H 2×2 F。
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