CN109897645A - A kind of liquid-crystal composition, display panel - Google Patents
A kind of liquid-crystal composition, display panel Download PDFInfo
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- CN109897645A CN109897645A CN201910231136.6A CN201910231136A CN109897645A CN 109897645 A CN109897645 A CN 109897645A CN 201910231136 A CN201910231136 A CN 201910231136A CN 109897645 A CN109897645 A CN 109897645A
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Abstract
The present invention provides a kind of liquid-crystal composition, display panel, belongs to field of display technology, can solve the problems, such as that the light transmission rate of existing reflective liquid-crystal display is low.Liquid-crystal composition of the invention, under illumination condition, the heterogeneous structure of photoresponse compound changes, and in the case, the bond energy of non-covalent bond can be changed, so that composition switchs to pellucidity by gel state, promotes transmitance；And under conditions of light is weak, the heterogeneous structure of compound changes again, changes the bond energy of non-covalent bond again, so that composition switchs to gel state by pellucidity, reduces transmitance, protects viewer's eyes.The liquid-crystal composition is suitable for various display devices, is particularly suitable for reflective display screen.
Description
Technical field
The invention belongs to field of display technology, and in particular to a kind of liquid-crystal composition, display panel.
Background technique
Reflective liquid-crystal display is a kind of to realize liquid crystal display that picture is shown using environment light as light source.
At least there are the following problems in the prior art for inventor's discovery: usual liquid crystal layer includes liquid crystal and other materials (example
Such as LCD vector) mixture, the transmitance of existing LCD vector is lower, this make the light transmission rate by liquid crystal layer compared with
Low, in the case where no backlight is supported, display brightness is secretly always the significant problem of conditioned reflex formula display development partially.
Summary of the invention
The present invention problem low for the light transmission rate of existing reflective liquid-crystal display, provides a kind of liquid crystal combination
Object, display panel.
Solving technical solution used by present invention problem is:
A kind of liquid-crystal composition, including liquid crystal and photoresponse compound；The photoresponse compound include the first group and
Second group, first group can switch between along anti-two kinds of isomeries, and second group includes non-covalent bond, and described first
Cis-trans structures can be changed in group under illumination condition, to change the bond energy of non-covalent bond, so that photoresponse compound is in illumination item
Transparent state is in gel state under the conditions of light low-light under part.
Optionally, the content of photoresponse compound is 15~20mg/ml in the liquid-crystal composition.
Optionally, first group includes azobenzene group.
Optionally, the non-covalent bond includes hydrogen bond.
Optionally, second group includes hydrazides group.
Optionally, the photoresponse compound includes the derivative of hydrazides and azobenzene group.
Optionally, the structural formula of the photoresponse compound are as follows:
Wherein, m is any positive integer in 1-12, and n is any positive integer in 5-10.
Optionally, the photoresponse compound includes following preparation step:
The present invention also provides a kind of display panels, including above-mentioned liquid-crystal composition.
Optionally, the display panel is reflective display panel.
Detailed description of the invention
Fig. 1 is the cis-structure of azobenzene group and the isomery of transconfiguration in 2 liquid-crystal composition of the embodiment of the present invention
Change schematic diagram；
Fig. 2 is the hydrazides of the embodiment of the present invention 2 and the derivative of azobenzene group under illumination or non-illumination condition
Transmitance comparison diagram；
Fig. 3 (a) azo group under ultraviolet light for the hydrazides of the embodiment of the present invention 2 and the derivative of azobenzene group
Group occurs isomery and changes spectrogram；
Fig. 3 (b) is that the hydrazides of the embodiment of the present invention 2 and the derivative of azobenzene group are stopping illumination azo group hair
Raw isomery changes spectrogram；
Fig. 4 is the repeatable characteristic light of the hydrazides of the embodiment of the present invention 2 and the derivative optical Response of azobenzene group
Spectrogram；
Fig. 5 is the structural schematic diagram of the display panel of the embodiment of the present invention 3.
Wherein, appended drawing reference are as follows: 1, first substrate；2, the second substrate；3, liquid-crystal composition.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Present invention is further described in detail for formula.
Embodiment 1:
The present embodiment provides a kind of liquid-crystal compositions, including liquid crystal and photoresponse compound；
The photoresponse compound includes the first group and the second group, and first group can be between along anti-two kinds of isomeries
Switching, second group includes non-covalent bond, and Cis-trans structures can be changed in first group under illumination condition, non-to change
The bond energy of covalent bond, so that photoresponse compound transparent state under illumination condition is in gel under the conditions of light low-light
State.
The liquid-crystal composition of the present embodiment, under illumination condition, the heterogeneous structure of photoresponse compound changes, herein
In the case of, the bond energy of non-covalent bond can be changed, so that composition switchs to pellucidity by gel state, promote transmitance；And
Under conditions of illumination weakens, the heterogeneous structure of compound changes again, changes the bond energy of non-covalent bond again, so that group
It closes object and gel state is switched to by pellucidity, reduce transmitance, protect viewer's eyes.The liquid-crystal composition is suitable for various aobvious
Showing device is particularly suitable for reflective display screen.
Embodiment 2:
The present embodiment provides a kind of liquid-crystal compositions, including liquid crystal and photoresponse compound；The photoresponse compound packet
The first group and the second group are included, first group can switch between along anti-two kinds of isomeries, and second group includes non-total
Valence link, Cis-trans structures can be changed in first group under illumination condition, to change the bond energy of non-covalent bond, so that photoresponse
Closing object transparent state under illumination condition is in gel state under the conditions of light low-light.Wherein, light in the liquid-crystal composition
The content for responding compound is 15~20mg/ml.
Be doped with light responsive material in the liquid-crystal composition of the present embodiment, wherein the content of photoresponse compound 15~
When within the scope of 20mg/ml, that is, it can guarantee the anisotropy of liquid crystal molecule, can also preferably improve light transmission rate when illumination.It needs
It is noted that can also having containing the two in addition to containing liquid crystal and photoresponse compound in the liquid-crystal composition of the present embodiment
Solvent, such as: any one or a few the mixture in n,N-Dimethylformamide, propyl alcohol or chlorobenzene, specifically, molten
The content range of agent can be calculated according to the size of display product, the capacity of liquid crystal cell.
As the optional embodiment of one of the present embodiment, first group includes azobenzene group.
That is, azobenzene group is as photoresponse group, as shown in Figure 1, when liquid-crystal composition is used for reflection type liquid
Crystal display, outdoors in use, with illumination progress, azobenzene group by transconfiguration variation be it is cis-, in this way can be with
Non-covalent bond is destroyed, so that liquid-crystal composition is pellucidity by gel state, under this state, the light transmittance of liquid crystal layer
It is higher.And when illumination is weaker, azobenzene group is transconfiguration by cis- variation, and such non-covalent bond is bonded again, so that
Liquid-crystal composition is changed into gel state by pellucidity, reduces the transmitance of liquid crystal layer.
Non-covalent bond in the present embodiment is exactly the outer-shell electron that two or more atoms are not used in conjunction with them, in ideal
In the case of reach electronics saturation state, thus form more stable chemical structure and be called non-covalent bond.
In one embodiment, the non-covalent bond includes hydrogen bond.
That is, can use azobenzene group by trans- variation is the bond energy for changing hydrogen bond during cis-structure,
Destroy hydrogen bond action；Azobenzene group is formation hydrogen bond during transconfiguration by cis- variation.
The specific group of hydrogen bonds is not limited in the present embodiment, in one embodiment, second group includes hydrazides
Group.
Wherein, hydrogen bond rich in hydrazides group can change the heterogeneous structure of azobenzene group and make rapidly
Accurately response.
Optionally, the photoresponse compound includes the derivative of hydrazides and azobenzene group.It may further be preferable that
The molar ratio of hydrazides group and azobenzene group is 1:1 in photoresponse compound.
Optionally, the structural formula of the photoresponse compound are as follows:
Wherein, m is any positive integer in 1-12, and n is any positive integer in 5-10.
A kind of specific preparation method of above-mentioned photoresponse compound, including following preparation step are provided in the present embodiment:
Wherein, the yield of above method synthetic product is between 42%-60%, by obtained hydrazides and azobenzene group
Derivative is recrystallized with DMF (n,N-Dimethylformamide), obtains yellow powder after dry.
After the derivative of the hydrazides of the present embodiment and azobenzene group is dissolved in solvent (such as n,N-Dimethylformamide),
It is placed in clear vial or transparent pipe (such as glass tube), as shown in Fig. 2, left figure (I) pipe is that illumination condition (can be ultraviolet
Light is also possible to visible light) under transmitance, that is to say, that before (I) pipe is placed in the blank sheet of paper for being printed on text, due to hydrazides and
The derivative of azobenzene group is changed into pellucidity, can clearly see (I) clearly through (I) pipe and manage subsequent text；Right figure
(II) transmitance under Guan Weiguang weak condition, that is to say, that before (II) pipe is placed in the blank sheet of paper for being printed on text, since (II) pipe does not have
Illumination is given, gel state is presented in the derivative of hydrazides and azobenzene group in (II) pipe, and (II) manages subsequent text quilt
(II) pipe blocks, and can not be had an X-rayed.It should be noted that the letter in Fig. 2 is only used for that the transparence of (I) pipe, (II) pipe is presented
State does not have literal meaning.
As shown in figure 3, (a) figure is under ultraviolet light (0,3s, 6s, 9s, 12s, 15s, 18s) at 365nm under wave crest
Drop represents azo group and isomery variation occurs, and macro manifestations are that solution is changed from muddiness to transparent state, and transmitance rises；(b) figure
It is off under illumination or light weak condition, heterogeneous structure restores, and becomes the muddy process of gel.The spectrum of Fig. 4 demonstrates gel hair
Photoresponse has been given birth to, and there is recovery and repeatability.
The derivative of hydrazides and azobenzene group is dissolved in solvent as gelator, passes through molecule in the present embodiment
Between hydrogen bond action, π-π interaction, the non-covalent interactions such as Van der Waals force, which are mutually assembled, is wound network of fibers knot
Structure, so that fettering solvent forms self-assemble gels.It should be noted that being said for n=6 with m=1 in the present embodiment
Bright, other similar derivatives are similar with following preparation methods, and details are not described herein.
Embodiment 3:
The present embodiment provides a kind of display panels, including above-mentioned liquid-crystal composition.
In one embodiment, the display panel is reflective display panel.Specifically, as shown in figure 5, reflective aobvious
Show that panel includes first substrate 1, the second substrate 2, and the liquid crystal combination between the first substrate 1 and the second substrate 2
Object 3.
Embodiment 4:
Present embodiments provide a kind of display device comprising any one of the above display panel.The display device can
With are as follows: liquid crystal display panel, Electronic Paper, mobile phone, tablet computer, television set, display, laptop, Digital Frame, navigation
Any products or components having a display function such as instrument.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of liquid-crystal composition, which is characterized in that including liquid crystal and photoresponse compound；The photoresponse compound includes the
One group and the second group, first group can switch between along anti-two kinds of isomeries, and second group includes non-covalent bond,
Cis-trans structures can be changed in first group under illumination condition, to change the bond energy of non-covalent bond, so that photoresponse compound
Transparent state is in gel state under the conditions of light low-light under illumination condition.
2. liquid-crystal composition according to claim 1, which is characterized in that photoresponse compound in the liquid-crystal composition
Content is 15~20mg/ml.
3. liquid-crystal composition according to claim 1, which is characterized in that first group includes azobenzene group.
4. liquid-crystal composition according to claim 1, which is characterized in that the non-covalent bond includes hydrogen bond.
5. liquid-crystal composition according to claim 1, which is characterized in that second group includes hydrazides group.
6. liquid-crystal composition according to claim 1, which is characterized in that the photoresponse compound includes hydrazides and azo
The derivative of phenyl group.
7. liquid-crystal composition according to claim 1, which is characterized in that the structural formula of the photoresponse compound are as follows:
Wherein, m is any positive integer in 1-12, and n is any positive integer in 5-10.
8. liquid-crystal composition according to claim 1, which is characterized in that the photoresponse compound includes following preparation step
It is rapid:
9. a kind of display panel, which is characterized in that including the described in any item liquid-crystal compositions of claim 1-8.
10. display panel according to claim 9, which is characterized in that the display panel is reflective display panel.
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