CN108441232A - Liquid-crystal composition and preparation method, display panel, display device - Google Patents
Liquid-crystal composition and preparation method, display panel, display device Download PDFInfo
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- CN108441232A CN108441232A CN201810253273.5A CN201810253273A CN108441232A CN 108441232 A CN108441232 A CN 108441232A CN 201810253273 A CN201810253273 A CN 201810253273A CN 108441232 A CN108441232 A CN 108441232A
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- liquid
- crystal composition
- graphene oxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/58—Dopants or charge transfer agents
- C09K19/586—Optically active dopants; chiral dopants
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
Abstract
The present invention relates to liquid crystal display material technical fields, more particularly to a kind of liquid-crystal composition and preparation method, display panel, display device.Doped with graphene oxide in the liquid-crystal composition.Graphene oxide, which is added, can make the contrast under TN normally black modes reach 1500：1, contribute to the displays such as reduction image retention bad, and the response time can be made to be improved.
Description
Technical field
The present invention relates to liquid crystal display material technical fields, more particularly to a kind of liquid-crystal composition and preparation method, show
Show panel, display device.
Background technology
LCD, which is shown, at present is broadly divided into two kinds of TN (twisted nematic) and ADS (advanced super dimension switch), wherein TN products
It is driven using vertical electric field, because it has many advantages, such as that quick response, manufacture craft are simple, of low cost, is still widely used in
The display fields such as electronic tag, laptop, monitor, industrial control instrument.But TN products in the market are mostly normal white mode, and
Without using normally black mode.This is because, under TN display patterns, liquid crystal pretilt angle is larger, and the liquid crystal molecule distorted will appear phase
The mistake that misplaces etc., causes Δ n to change, and to dark-state light transmission, makes degradation in contrast, is not used to normally black mode.And traditional liquid
Crystalline substance is also easy to produce photochemical reaction in backlight illumination, harmful intermediate such as generates free radicals, image retention is caused to generate.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of liquid-crystal composition and preparation method, display panel, displays
Device.
According to an aspect of the present invention, a kind of liquid-crystal composition is provided, doped with oxidation stone in the liquid-crystal composition
Black alkene.
According to embodiment of the present invention, by weight percentage, the content of the graphene oxide be 0.01~
2wt%.
According to embodiment of the present invention, by weight percentage, the content of the graphene oxide be 0.2~
0.4wt%.
According to embodiment of the present invention, by weight percentage, the liquid-crystal composition includes30~50wt%, and four or more the compound in following general formula：
0~70wt%,
0~70wt%,
0~70wt%,
Wherein, each R is each independently selected from C1~C12 alkyl, C2~C12 alkenyls or C1~C12 alkoxies, eachIt is each independently selected from phenyl or cyclohexyl.
According to embodiment of the present invention, by weight percentage, the liquid-crystal composition includes
Four or more in 30~50wt% and following compound：
0~20wt%,
0~10wt%,
0~20wt%,
0~20wt%,
0~20wt%,0~10wt%.
According to embodiment of the present invention, by weight percentage, the liquid-crystal composition is aoxidized comprising 0.4wt%
The compound of graphene and following content：
50wt%,
20wt%,
5wt%,
10wt%,
5wt%,
5wt%,
4.6wt%.
According to another aspect of the present invention, the preparation method of liquid-crystal composition as described above is provided, including：By liquid crystal
Each component mixing in composition, heating obtain the liquid-crystal composition.
According to another aspect of the invention, a kind of display panel, including liquid-crystal composition as described above are provided.
In accordance with a further aspect of the present invention, a kind of display device, including display panel as described above are provided.
Graphene oxide is added in the present invention in a liquid crystal composition, and when not powered, graphene oxide is by liquid crystal molecule
Intermolecular force influences, and is parallel to glass substrate arrangement, light is blocked, solves TN normally black mode dark-state leakage problems；
When power-up, there is graphene oxide molecule polarity, induction field to rotate, make it perpendicular to glass substrate, light is made to penetrate.Mesh
The preceding normal white mode LCD contrasts of TN are 1000：1, and the TN normally black modes of graphene oxide doped are used, contrast can reach
1500：1.
Graphene oxide, which is added, can also promote the reliability of liquid-crystal composition, contribute to the displays such as reduction image retention bad.
This is because after graphene oxide is added, since the big pi bond of graphene oxide is coupled with the phenyl ring of liquid crystal molecule, make liquid crystal
Molecule promotes optical physics reaction rate when by backlight illumination, reduces photochemical reaction rate, is harmful to reduce to generate
The probability of substance improves image retention performance.
In addition, graphene oxide, compared with graphene, molecule itself has polarity, and it can be with induction field, this is just not necessarily to liquid
Brilliant molecule drives deflection, but graphene oxide molecule is from main deflection so that the response time is improved.
Description of the drawings
Fig. 1 is the not powered status diagram of TN normally black modes.
Fig. 2 is the powering state schematic diagram of TN normally black modes.
Wherein, 1- liquid crystal molecules, 2- graphene oxides, 3- light, 4- glass substrates.
Specific implementation mode
Specific implementation mode is only the description of the invention, without constituting the limitation to the content of present invention, below in conjunction with
Invention is further explained and description for specific embodiment.
According to an aspect of the present invention, a kind of liquid-crystal composition is provided, doped with oxidation stone in the liquid-crystal composition
Black alkene.
Graphene oxide is added in the present invention in a liquid crystal composition, and when not powered, graphene oxide is by liquid crystal molecule
Intermolecular force influences, and is parallel to glass substrate arrangement, light is blocked, solves TN normally black mode dark-state leakage problems；
When power-up, there is graphene oxide molecule polarity, induction field to rotate, make it perpendicular to glass substrate, light is made to penetrate.Mesh
The preceding normal white mode LCD contrasts of TN are 1000：1, and the TN normally black modes of graphene oxide doped are used, contrast can reach
1500：1.
Graphene oxide, which is added, can also promote the reliability of liquid-crystal composition, contribute to the displays such as reduction image retention bad.
This is because after graphene oxide is added, since the big pi bond of graphene oxide is coupled with the phenyl ring of liquid crystal molecule, make liquid crystal
Molecule promotes optical physics reaction rate when by backlight illumination, reduces photochemical reaction rate, is harmful to reduce to generate
The probability of substance improves image retention performance.
In addition, graphene oxide, compared with graphene, molecule itself has polarity, it can be with induction field, without liquid crystal point
The dynamic deflection of subband, but graphene oxide molecule is from main deflection so that the response time is improved.
Fig. 1 is the not powered status diagram of TN normally black modes.Fig. 2 is the powering state schematic diagram of TN normally black modes.Such as
Shown in Fig. 1, when not powered, the long axis of liquid crystal molecule in liquid-crystal composition according to the present invention is parallel to glass substrate arrangement,
Graphene oxide is influenced by the intermolecular force of liquid crystal molecule, is parallel to glass substrate arrangement, light is blocked, light can not be saturating
It crosses.As shown in Fig. 2, when powering up, the liquid crystal molecule induction field in liquid-crystal composition according to the present invention rotates, vertically
In glass substrate, graphene oxide molecule has polarity, and similarly induction field rotates, and makes it perpendicular to glass substrate,
Light is set to penetrate.
Graphene oxide, graphene structure respectively such as following formula (I), shown in formula (II)：
Graphene oxide is the oxide of graphene, and color is brown color, and common product has powdered, piece on the market
Shape and solution shape.After oxidation processes, graphite oxide still keeps the layer structure of graphite, but in each layer of graphene
Many oxygroup functional groups are introduced on monolithic.The introducing of these oxygroup functional groups is so that single graphene-structured becomes very multiple
It is miscellaneous.
According to embodiment of the present invention, by weight percentage, the content of the graphene oxide be 0.01~
2wt%.
When the weight percent of graphene oxide is less than 0.01%, light can not be blocked completely, there are leakage problems.When
When the weight percent of graphene oxide is higher than 2%, the light transmission rate of illuminated state can be caused also poor.
According to embodiment of the present invention, by weight percentage, the content of the graphene oxide be 0.2~
0.4wt%.
When the weight percent of graphene oxide is in the range of 0.2~0.4wt%, can make under TN normally black modes
Contrast can reach 1500：1, and promote image retention performance.
According to embodiment of the present invention, by weight percentage, the liquid-crystal composition includes30~50wt%, and four or more the compound in following general formula：
0~70wt%,
0~70wt%,
0~70wt%,
Wherein, each R is each independently selected from C1~C12 alkyl, C2~C12 alkenyls or C1~C12 alkoxies, eachIt is each independently selected from phenyl or cyclohexyl.
Each R can be each independently selected from such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl group, amyl, different
The alkyl groups such as amyl, hexyl, the alkenyl groups such as vinyl, acrylic, cyclobutenyl, pentenyl, hexenyl, methoxyl group, ethoxy
The alkoxy bases such as base, propoxyl group, butoxy, amoxy, hexyloxy.
Refer to respectively independently that each R can be the same or different, eachIt can be the same or different (same
In one general formulaIn different general formulasSo).For example,
Can be
Wherein each R may each be any one in above-mentioned alkyl group, alkenyl group, alkoxy base.
ForIn R,Also identical understanding should be done.
Mainly play solvent in the liquid-crystal composition, for dissolving other liquid crystal groups
Point and graphene oxide.
" four or more the compound in following general formula " should be made following to understand：This four or more
Compound can be both selected from logical formula (III), be both selected from logical formula (IV), be both selected from logical formula (V), can also be selected from logical formula (III),
Any two in logical formula (IV), logical formula (V) these three general formulas or three.
According to embodiment of the present invention, which is not selected from the same general formula (i.e.
Any two in logical formula (III), logical formula (IV), logical formula (V) these three general formulas or three).One according to the present invention
Embodiment, two in three general formulas of four or more the compound.An embodiment party according to the present invention
Formula, three in three general formulas of four or more the compound.Since the structure type of each compound is variant,
Complementation can be realized between performance to a certain extent, to make finally obtained compound that there is better liquid crystal property.
" four or more compound " may, for example, be four kinds of compounds, five kinds of compounds, six kinds of compounds etc..
According to embodiment of the present invention, by weight percentage, the liquid-crystal composition includes
Four or more in 30~50wt% of compound a and following compound：
0~20wt%,
0~10wt%,
0~20wt%,
0~20wt%,
0~20wt%,
0~10wt%.
According to embodiment of the present invention, by weight percentage, the liquid-crystal composition is aoxidized comprising 0.4wt%
The compound of graphene and following content：
50wt%,
20wt%,
5wt%,
10wt%,
5wt%,
5wt%,
4.6wt%.
According to another aspect of the present invention, the preparation method of liquid-crystal composition as described above is provided, including：By liquid crystal
Each component mixing in composition, heating obtain the liquid-crystal composition.
According to another aspect of the invention, a kind of display panel, including liquid-crystal composition as described above are provided.
In accordance with a further aspect of the present invention, a kind of display device, including display panel as described above are provided.
The liquid-crystal composition of the present invention is further detailed with reference to specific embodiment.
Comparative example 1：
Birefringence n=0.101, Tni=75 DEG C of comparative example of clearing point 2：
| Component | Weight percent (wt%) |
| Compound a | 50 |
| Compound b | 20 |
| Compound c | 5 |
| Compound d | 10 |
| Compound e | 5 |
| Compound f | 5 |
| Compound g | 5 |
| Graphene | 0.4 |
Birefringence n=0.101, Tni=75 DEG C of clearing point
Embodiment 1：
Birefringence n=0.101, Tni=75 DEG C of clearing point
Embodiment 2：
| Component | Weight percent (wt%) |
| Compound a | 30 |
| Compound b | 15 |
| Compound c | 15 |
| Compound d | 15 |
| Compound e | 10 |
| Compound f | 5 |
| Compound g | 10 |
| Graphene oxide | 0.4 |
Birefringence n=0.104, Tni=81 DEG C of clearing point
Embodiment 3：
| Component | Weight percent (wt%) |
| Compound a | 35 |
| Compound b | 10 |
| Compound c | 15 |
| Compound d | 10 |
| Compound e | 10 |
| Compound f | 10 |
| Compound g | 10 |
| Graphene oxide | 0.3 |
Birefringence n=0.103, Tni=77 DEG C of clearing point
Embodiment 4：
| Component | Weight percent (wt%) |
| Compound a | 40 |
| Compound b | 5 |
| Compound c | 10 |
| Compound d | 10 |
| Compound e | 10 |
| Compound f | 10 |
| Compound g | 15 |
| Graphene oxide | 0.2 |
Birefringence n=0.102, Tni=74 DEG C of clearing point
Preparation method：By each component of the liquid-crystal composition in embodiment or comparative example in the ratio in above table
It weighs, mix, be added in vial, be heated to 60 DEG C, electromagnetic agitation or mechanical agitation 1h obtain liquid-crystal composition, liquid crystal group
It is liquid to close object.
The liquid-crystal composition obtained in the embodiment of the present invention and comparative example is tested for the property.
The liquid-crystal composition obtained in the embodiment of the present invention and comparative example is poured into test liquid crystal cell, is powered up
, and measure transmitance.
Lw：Illuminated state brightness, unit cd/m2, test equipment is DMS501 display screen photoeletric measuring systems,
Lb：Dark-state brightness, unit cd/m2, test equipment is DMS501 display screen photoeletric measuring systems；
Cr：Contrast, Cr=Lw/Lb；
VHR：Voltage retention (%), test condition is 60 ± 2 DEG C, voltage is ± 5V, pulse width 10ms, voltage are protected
Hold time 16.7ms.Test equipment is TOYO Model6254 liquid crystal property comprehensive testers.
When liquid crystal material photochemical reaction is more serious, wherein the ion and free radical that contain are more, VHR is lower, therefore
Liquid crystal photochemical reaction degree is characterized using voltage retention.
τ：Indicate ton+toff (response time) (ms), ton indicate until when while reaching maximum brightness 90%, connects when
Between, time when toff indicates to cut off when until reaching maximum brightness 10%.
Test result is as shown in table 1.
The results of property table of the liquid-crystal compounds of 1 embodiment of table and comparative example
| Lw(cd/m2) | Lb(cd/m2) | Cr | VHR (%) | ton(ms) | toff(ms) | τ(ms) | |
| Comparative example 1 | 400 | 0.5 | 800：1 | 96.76 | 3.2 | 7.3 | 10.5 |
| Comparative example 2 | 390 | 0.26 | 1500：1 | 97.69 | 4.7 | 7.6 | 12.3 |
| Embodiment 1 | 392 | 0.27 | 1500：1 | 97.71 | 3.3 | 7.4 | 10.7 |
| Embodiment 2 | 397 | 0.24 | 1654：1 | 97.73 | 3.2 | 7.3 | 10.5 |
| Embodiment 3 | 389 | 0.25 | 1556：1 | 97.71 | 3.3 | 7.3 | 10.6 |
| Embodiment 4 | 394 | 0.27 | 1459：1 | 97.72 | 3.5 | 7.5 | 11.0 |
Comparative example 1 is not added with graphene and graphene oxide, and comparative example 2 adds the graphene of 0.4wt%, real
Apply the graphene oxide that example 1 adds 0.4wt%.In liquid crystal components it can be seen from the comparison of embodiment 1 and comparative example 1
After middle addition graphene oxide, the dark-state of test liquid crystal cell is obviously improved, and contrast is promoted to 1500：1, and VHR is carried
It is high.Graphene oxide is adulterated it can be seen from the comparison of embodiment 1 and comparative example 2 than liquid crystal that doped graphene obtains
The response time of composition obviously becomes faster.This is because graphene oxide itself has polarity, can be deflected with induction field,
Therefore the response time is very fast；And graphene needs liquid crystal molecule to drive deflection, therefore the response time is slower.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of liquid-crystal composition, which is characterized in that doped with graphene oxide in the liquid-crystal composition.
2. liquid-crystal composition according to claim 1, which is characterized in that by weight percentage, the graphene oxide
Content be 0.01~2wt%.
3. liquid-crystal composition according to claim 2, which is characterized in that by weight percentage, the graphene oxide
Content be 0.2~0.4wt%.
4. liquid-crystal composition according to claim 1, which is characterized in that by weight percentage, the liquid-crystal composition
Also include30~50wt%, and four or more the compound in following general formula：
0~70wt%,
0~70wt%,
0~70wt%,
Wherein, each R is each independently selected from C1~C12 alkyl, C2~C12 alkenyls or C1~C12 alkoxies, each
It is each independently selected from phenyl or cyclohexyl.
5. liquid-crystal composition according to claim 1, which is characterized in that by weight percentage, the liquid-crystal composition
Also includeFour or more in 30~50wt% and following compound：
0~20wt%,
0~10wt%,
0~20wt%,
0~20wt%,
0~20wt%,
0~10wt%.
6. liquid-crystal composition according to claim 1, which is characterized in that by weight percentage, the liquid-crystal composition
Include the compound of 0.4wt% graphene oxides and following content：
50wt%,
20wt%,
5wt%,
10wt%,
5wt%,
5wt%,
4.6wt%.
7. a kind of preparation method of liquid-crystal composition as described in any one of claim 1~6, which is characterized in that including：
Each component in liquid-crystal composition is mixed, heating obtains the liquid-crystal composition.
8. a kind of display panel, which is characterized in that including such as claim 1~6 any one of them liquid-crystal composition.
9. a kind of display device, which is characterized in that including display panel as claimed in claim 8.
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ID=63197206
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Application publication date: 20180824 |