CN103361083B - Bistable cholesteric liquid crystal composition - Google Patents
Bistable cholesteric liquid crystal composition Download PDFInfo
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- CN103361083B CN103361083B CN201310190952.XA CN201310190952A CN103361083B CN 103361083 B CN103361083 B CN 103361083B CN 201310190952 A CN201310190952 A CN 201310190952A CN 103361083 B CN103361083 B CN 103361083B
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- liquid crystal
- cholesteric liquid
- composition
- bistable
- fine particle
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Abstract
The present invention discloses a kind of Bistable cholesteric liquid crystal composition, comprising: bistable state cholesteric liquid crystal molecule and fine particle composition.The present invention, except reducing the driving voltage of liquid crystal layer, can also increase the contrast gradient of liquid crystal layer.
Description
Technical field
The invention relates to a kind of liquid crystal layer of liquid crystal panel, relate to a kind of bistable cholesteric liquid crystal composite especially.
Background technology
In current high energy-conservation epoch and trend, volume is frivolous and the indicating meter of power saving becomes the main flow in current field of display, and bistable state liquid crystal display apparatus is attracted attention especially.Wherein, cholesterin liquid-crystal display (CholestericLiquidCrystalDisplay, ChLCD) because of the advantage such as there is high brightness, high contrast, power saving, memory, wide viewing angle, do not glimmer, and can when removing electric field, have and continue to maintain the on state of state different from dark-state two kinds, therefore become the development priority of current bistable display.
Cholesterol liquid crystal is a kind of liquid crystal molecule with Bragg reflection and bistable characteristic, its can reflection wavelength and its pitch quite and the identical incident light of opticity, under the driving of electric field, can switch to reflection state (planarstate) or these two kinds of stable states of scattering states (focalconicstate).In a cholesterin liquid-crystal display, cholesterol liquid crystal can reflect the light of specific wavelength when reflecting state, therefore corresponding pixel can present on state of; Cholesterol liquid crystal can make light scatter when scattering states and the black backboard be arranged at thereafter absorbs, and therefore corresponding pixel can present dark-state.
But, when cholesterol liquid crystal will be converted to reflection state from scattering states, a critical voltage must be provided to drive cholesterol liquid crystal, and from scattering states be converted to reflection state process be called vertical state (homeotropicstate), the driving voltage of this vertical state is normally greater than 50 volts.In addition, the cholesterol liquid crystal light scattering phenomenon that it produces when scattering states can make the contrast gradient of indicating meter reduce.
Therefore, be necessary to provide a kind of Bistable cholesteric liquid crystal composition, solve the problem existing for known technology.
Summary of the invention
In view of this, the invention provides a kind of Bistable cholesteric liquid crystal composition, to improve problem existing in known technology.
Main purpose of the present invention is to provide a kind of Bistable cholesteric liquid crystal composition, and it is to improve the physical property of liquid crystal layer by interpolation fine particle composition.Bistable cholesteric liquid crystal composition of the present invention, except reducing the driving voltage of liquid crystal layer, can also increase the contrast gradient of liquid crystal layer.
For reaching above-mentioned purpose, the invention provides a kind of Bistable cholesteric liquid crystal composition, for forming the liquid crystal layer of liquid crystal panel, this Bistable cholesteric liquid crystal composition comprises: bistable state cholesteric liquid crystal molecule; And fine particle composition, the specific refractory power of this fine particle composition is between 1.5 to 3.
In one embodiment of this invention, the electric conductivity of this fine particle composition is between 10
-6s/cm to 10
5between S/cm.
In one embodiment of this invention, the electric conductivity of this fine particle composition is between 10
-2s/cm to 10
5between S/cm.
In one embodiment of this invention, the material of this fine particle composition comprises titanium dioxide, silver suboxide, ferric oxide, zinc oxide, indium trioxide, tindioxide, Cadmium oxide, titanium nitride, tin indium oxide, indium zinc oxide, zinc-gallium oxide or zinc oxide aluminum.
In one embodiment of this invention, this bistable state cholesteric liquid crystal molecule comprises a liquid crystal molecule and a chiral dope, and relative to this liquid crystal molecule of 100 weight parts, the content of this fine particle composition is 0.1 to 5 weight part.
In one embodiment of this invention, the content of this chiral dope is 5 to 20 weight parts.
In one embodiment of this invention, the particle diameter of this fine particle composition is between 15 how rice to 30000 how between rice.
In one embodiment of this invention, this Bistable cholesteric liquid crystal composition also comprises a polymerizable compound.
In one embodiment of this invention, this polymerizable compound is liquid crystal active monomer.
Bistable cholesteric liquid crystal composition of the present invention is to improve the physical property of liquid crystal layer by interpolation fine particle composition.Compared to prior art, the present invention, except reducing the driving voltage of liquid crystal layer, can also increase the contrast gradient of liquid crystal layer.
Accompanying drawing explanation
1st figure illustrates the sectional view of cholesterol liquid crystal panel in the embodiment of the present invention;
2nd figure is the results contrast figure that cholesterol liquid crystal panel contains titanium dioxide fine particles and the driving voltage not containing titanium dioxide fine particles.
[primary clustering nomenclature]
1 cholesterol liquid crystal panel
10 first transparency carriers
20 second transparency carriers
30 liquid crystal layers
301 bistable state cholesteric liquid crystal molecules
302 fine particle compositions
40 first transparent electrode layers
50 second transparent electrode layers.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being reached object and effect, hereby illustrate below and coordinate graphic being explained in detail.
Refer to Fig. 1, its cholesterol liquid crystal panel be made up of Bistable cholesteric liquid crystal composition in the embodiment of the present invention, wherein this cholesterol liquid crystal panel 1 comprises one first transparency carrier 10,1 second transparency carrier 20, liquid crystal layer 30,1 first transparent electrode layer 40 and one second transparent electrode layer 50.This first transparency carrier 10 is oppositely arranged with this second transparency carrier 20, and this first transparency carrier 10 and this second transparency carrier 20 can be glass substrate, plastic substrate or flexible base plate etc.This liquid crystal layer 30 is located between this first transparency carrier 10 and this second transparency carrier 20, and this liquid crystal layer 30 is made up of bistable state cholesteric liquid crystal molecule 301 and fine particle composition 302.This first transparent electrode layer 40 is formed on the internal surface of this first transparency carrier 10, and this second transparent electrode layer 50 is formed on the internal surface of this second transparency carrier 20, and this liquid crystal layer 30 contacts this first transparent electrode layer 40 and this second transparent electrode layer 50.This first transparent electrode layer 40 and the better use transparent conductive oxide of this second transparent electrode layer 50 (Transparentconductiveoxides, TCO) formed, this transparent conductive metal such as indium tin oxide (IndiumTinOxide, ITO), tin-oxide (TinOxide, TO), indium-zinc oxide (IndiumZincOxide, and indium tin zinc oxide (IndiumTinZincOxide, ITZO) etc. IZO).
In this liquid crystal layer 30, this bistable state cholesteric liquid crystal molecule 301 is made up of liquid crystal molecule (not shown) and chiral dope (not shown), relative to this liquid crystal molecule of 100 weight parts, the content of this fine particle composition 302 is 0.1 to 5 weight part, and the content of this chiral dope is then 5 to 20 weight parts.Foregoing liquid crystal molecule is nematic liquid crystal molecules, and it can be such as ZLI-1221, ZLI-1291, ZLI-1565 or ZLI-2293 (commercial numbering) etc. that Merck (Merck) company produces.Aforementioned chiral dope is divided into left-handed photo etching and dextrorotation photo etching, and this left-handed photo etching can be such as S811 or S1011 (commercial numbering) etc.; This dextrorotation photo etching can be such as R811 or R1011 (commercial numbering) etc.Moreover the specific refractory power of this fine particle composition 302 is between 1.5 to 3.The electric conductivity of this fine particle composition 302 is between 10
-6s/cm to 10
5between S/cm, be preferably between 10
-2s/cm to 10
5between S/cm.The material of this fine particle composition 302 can be titanium dioxide, silver suboxide, ferric oxide, zinc oxide, indium trioxide, tindioxide, Cadmium oxide, titanium nitride, tin indium oxide, indium zinc oxide, zinc-gallium oxide or zinc oxide aluminum etc., and its particle diameter is between 15 how rice to 30000 how between rice.In another embodiment of the invention, this liquid crystal layer 30 also can comprise a polymerizable compound (not shown), and this polymerizable compound is liquid crystal active monomer (liquidcrystalreactivemonomers).
Below enumerate an embodiment and a comparative example to be illustrated in liquid crystal layer 30 of the present invention Bistable cholesteric liquid crystal composition for the concrete effect reducing driving voltage.
embodiment 1
First the ZLI-2293 liquid crystal molecule that Merck (Merck) company weighing respectively 10 grams produces, the left-handed photo etching of S-811 that Merck (Merck) company of 1 gram produces, and the P-25 titanium dioxide fine particles (median size be about 30 how rice) that the Degussa of 0.2 gram (Degussa) company produces, continue this ZLI-2293 liquid crystal molecule, the left-handed photo etching of this S-811 and this P-25 titanium dioxide fine particles mix fully and obtain Bistable cholesteric liquid crystal composition of the present invention, finally Bistable cholesteric liquid crystal composition of the present invention flow in this liquid crystal layer 30 and obtain cholesterol liquid crystal panel 1 of the present invention.
comparative example 1
Except not comprising the P-25 titanium dioxide fine particles of Degussa (Degussa) company production, prepare a cholesterol liquid crystal panel compared in the same manner as in Example 1.
Refer to Fig. 2, it is the results contrast figure of the driving voltage of embodiment 1 and comparative example 1.The present invention has the Bistable cholesteric liquid crystal composition (i.e. embodiment 1) of adding P-25 titanium dioxide fine particles compared to the Bistable cholesteric liquid crystal composition (i.e. comparative example 1) of not adding P-25 titanium dioxide fine particles as shown in Figure 2, and the driving voltage of Bistable cholesteric liquid crystal composition of the present invention is evident as lower.The Bistable cholesteric liquid crystal composition (i.e. comparative example 1) of not adding P-25 titanium dioxide fine particles is though had bistable characteristic, and except contrast is only about 3 ~ 4, its driving voltage is also higher reaches 15V; But, Bistable cholesteric liquid crystal composition of the present invention (i.e. embodiment 1) adds P-25 titanium dioxide fine particles because have, its degree of birefringence △ n is promoted, therefore its scattering states (contrast) rises to about 8 ~ 9, its driving voltage also declines to a great extent to 8V, and then realizes the bistable liquid crystal display of a high contrast, low driving voltage.
As mentioned above, Bistable cholesteric liquid crystal composition of the present invention is to utilize the characteristic of its high refractive index to improve the physical property of overall liquid crystal layer by interpolation fine particle composition, this fine particle composition is except reducing the driving voltage of liquid crystal layer, the scattering states (i.e. contrast gradient) of liquid crystal layer can also be strengthened, reach high contrast and the bi-stable display effects of low driving voltage, thus solve the problem existing for prior art.
Although the present invention with preferred embodiment openly as above; so itself and be not used to limit the present invention; persond having ordinary knowledge in the technical field of the present invention; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, therefore protection scope of the present invention is when being as the criterion depending on the aforesaid claim person of defining.
Claims (6)
1. a Bistable cholesteric liquid crystal composition, is characterized in that, for forming the liquid crystal layer of liquid crystal panel, this Bistable cholesteric liquid crystal composition comprises:
Bistable state cholesteric liquid crystal molecule; And
Fine particle composition, the specific refractory power of this fine particle composition is between 1.5 to 3;
This bistable state cholesteric liquid crystal molecule comprises a nematic liquid crystal molecules and a chiral dope, and relative to this nematic liquid crystal molecules of 100 weight parts, the content of this fine particle composition is 0.1 to 5 weight part;
This Bistable cholesteric liquid crystal composition also comprises a polymerizable compound, and this polymerizable compound is liquid crystal active monomer.
2. Bistable cholesteric liquid crystal composition as claimed in claim 1, it is characterized in that, the electric conductivity of this fine particle composition is between 10
-6s/cm to 10
5between S/cm.
3. Bistable cholesteric liquid crystal composition as claimed in claim 2, it is characterized in that, the electric conductivity of this fine particle composition is between 10
-2s/cm to 10
5between S/cm.
4. Bistable cholesteric liquid crystal composition as claimed in claim 1, it is characterized in that, the material of this fine particle composition comprises titanium dioxide, silver suboxide, ferric oxide, zinc oxide, indium trioxide, tindioxide, Cadmium oxide, titanium nitride, tin indium oxide, indium zinc oxide, zinc-gallium oxide or zinc oxide aluminum.
5. Bistable cholesteric liquid crystal composition as claimed in claim 1, it is characterized in that, relative to this nematic liquid crystal molecules of 100 weight parts, the content of this chiral dope is 5 to 20 weight parts.
6. Bistable cholesteric liquid crystal composition as claimed in claim 1, is characterized in that, the particle diameter of this fine particle composition is between 15 how rice to 30000 how between rice.
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| CN201310190952.XA CN103361083B (en) | 2013-05-22 | 2013-05-22 | Bistable cholesteric liquid crystal composition |
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|---|---|---|---|
| CN201310190952.XA CN103361083B (en) | 2013-05-22 | 2013-05-22 | Bistable cholesteric liquid crystal composition |
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| Publication Number | Publication Date |
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| CN103361083A CN103361083A (en) | 2013-10-23 |
| CN103361083B true CN103361083B (en) | 2016-03-23 |
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| CN104749825B (en) * | 2015-04-16 | 2018-01-30 | 京东方科技集团股份有限公司 | A kind of liquid crystal cell and preparation method thereof, display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087864A (en) * | 2004-12-16 | 2007-12-12 | 西柏控股有限公司 | Cholesteric monolayers and monolayer pigments with particular properties, their production and use |
| CN101382689A (en) * | 2008-10-21 | 2009-03-11 | 北京科技大学 | Method for producing electronic paper material with magnetic addressing and erasing characteristic |
| US7713436B1 (en) * | 2005-09-19 | 2010-05-11 | The University Of Rochester | Electrically actuatable doped polymer flakes and electrically addressable optical devices using suspensions of doped polymer flakes in a fluid host |
| CN101990675A (en) * | 2008-03-14 | 2011-03-23 | 联邦印刷有限公司 | Document having an emissive display device |
| CN102375284A (en) * | 2010-08-19 | 2012-03-14 | 台达电子工业股份有限公司 | Switchable imaging device using mesoporous particles |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5076527B2 (en) * | 2007-02-05 | 2012-11-21 | 富士ゼロックス株式会社 | Liquid crystal-containing composition, method for producing liquid crystal-containing composition, and liquid crystal display device |
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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087864A (en) * | 2004-12-16 | 2007-12-12 | 西柏控股有限公司 | Cholesteric monolayers and monolayer pigments with particular properties, their production and use |
| US7713436B1 (en) * | 2005-09-19 | 2010-05-11 | The University Of Rochester | Electrically actuatable doped polymer flakes and electrically addressable optical devices using suspensions of doped polymer flakes in a fluid host |
| CN101990675A (en) * | 2008-03-14 | 2011-03-23 | 联邦印刷有限公司 | Document having an emissive display device |
| CN101382689A (en) * | 2008-10-21 | 2009-03-11 | 北京科技大学 | Method for producing electronic paper material with magnetic addressing and erasing characteristic |
| CN102375284A (en) * | 2010-08-19 | 2012-03-14 | 台达电子工业股份有限公司 | Switchable imaging device using mesoporous particles |
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