CN103361083A - Bistable cholesteric liquid crystal composition - Google Patents
Bistable cholesteric liquid crystal composition Download PDFInfo
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- CN103361083A CN103361083A CN201310190952XA CN201310190952A CN103361083A CN 103361083 A CN103361083 A CN 103361083A CN 201310190952X A CN201310190952X A CN 201310190952XA CN 201310190952 A CN201310190952 A CN 201310190952A CN 103361083 A CN103361083 A CN 103361083A
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Abstract
The invention discloses a bistable cholesteric liquid crystal composition. The bistable cholesteric liquid crystal composition comprises bistable cholesteric liquid crystal molecules and metal compound particles. The bistable cholesteric liquid crystal composition disclosed by the invention can not only reduce the driving voltage of a liquid crystal layer, but also increase the contrast of the liquid crystal layer.
Description
Technical field
The invention relates to a kind of liquid crystal layer of liquid crystal panel, particularly relevant for a kind of bistable cholesteric liquid crystal composite.
Background technology
In at present high energy-conservation epoch and trend, volume indicating meter frivolous and power saving becomes the main flow in the present field of display, and bistable state liquid crystal display apparatus is attracted attention especially.Wherein, cholesterin liquid-crystal display (Cholesteric Liquid Crystal Display, ChLCD) because of the advantage such as have high brightness, high contrast, power saving, memory, wide viewing angle, do not glimmer, and can be in the situation that remove electric field, possess to have and continue to keep two kinds of different states of bright attitude and dark attitude, therefore become the development priority of present bistable display.
Cholesterol liquid crystal is a kind of liquid crystal molecule with Bragg reflection and bistable characteristic, the incident light that but its reflection wavelength is suitable with its pitch and opticity is identical can switch to reflection attitude (planar state) or these two kinds of stable states of scattering states (focal conic state) under the driving of electric field.In a cholesterin liquid-crystal display, cholesterol liquid crystal can reflect the light of specific wavelength when the reflection attitude, and therefore corresponding pixel can present bright attitude; Cholesterol liquid crystal can make light scatter when scattering states and the black backboard that is arranged at thereafter absorbs, and therefore corresponding pixel can present dark attitude.
Yet, when cholesterol liquid crystal will be converted to the reflection attitude from scattering states, must provide a critical voltage to drive cholesterol liquid crystal, be called vertical attitude (homeotropic state) and be converted to the process that reflects attitude from scattering states, the driving voltage of this vertical attitude is normally greater than 50 volts.In addition, the cholesterol liquid crystal light scattering phenomenon meeting that it produces when scattering states is so that the contrast gradient reduction of indicating meter.
Therefore, be necessary to provide a kind of bistable cholesteric sterol liquid-crystal composition, solve the existing problem of known technology.
Summary of the invention
In view of this, the invention provides a kind of bistable cholesteric sterol liquid-crystal composition, to improve existing problem in the known technology.
Main purpose of the present invention is to provide a kind of bistable cholesteric sterol liquid-crystal composition, and it is by adding fine particle composition to improve the physical property of liquid crystal layer.Bistable cholesteric sterol liquid-crystal composition of the present invention can also increase the contrast gradient of liquid crystal layer except reducing the driving voltage of liquid crystal layer.
For reaching above-mentioned purpose, the invention provides a kind of bistable cholesteric sterol liquid-crystal composition, be used for consisting of the liquid crystal layer of liquid crystal panel, this bistable cholesteric sterol liquid-crystal composition comprises: the 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 the S/cm.
In one embodiment of this invention, the electric conductivity of this fine particle composition is between 10
-2S/cm to 10
5Between the 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 with respect 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 be between 15 how rice to 30000 how between the rice.
In one embodiment of this invention, this bistable cholesteric sterol liquid-crystal composition also comprises a polymerizable compound.
In one embodiment of this invention, this polymerizable compound is the liquid crystal active monomer.
Bistable cholesteric sterol liquid-crystal composition of the present invention is by adding fine particle composition to improve the physical property of liquid crystal layer.Compared to prior art, the present invention can also increase the contrast gradient of liquid crystal layer except reducing the driving voltage of liquid crystal layer.
Description of drawings
The 1st figure illustrates the sectional view of cholesteric liquid crystal panel in the embodiment of the invention;
The 2nd figure is that the cholesteric liquid crystal panel contains the as a result comparison diagram that titanium dioxide fine particles reaches the driving voltage that does not contain titanium dioxide fine particles.
[primary clustering nomenclature]
1 cholesteric 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, reached purpose and effect, below hereby for example and cooperate the graphic explanation of giving in detail.
See also Fig. 1, the cholesteric liquid crystal panel that it is comprised of bistable cholesteric sterol liquid-crystal composition in the embodiment of the invention, wherein this cholesteric liquid crystal panel 1 comprises one first transparency carrier 10, one second transparency carrier 20, a liquid crystal layer 30, one 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 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 these liquid crystal layer 30 this first transparent electrode layer 40 of contact and this second transparent electrode layers 50.This first transparent electrode layer 40 and this second transparent electrode layer 50 better use transparent conductive oxide (Transparent conductive oxides, TCO) form, this transparent conductive metal such as indium tin oxide (Indium Tin Oxide, ITO), tin-oxide (Tin Oxide, TO), indium-zinc oxide (Indium Zinc Oxide, IZO) and indium tin zinc oxide (Indium Tin Zinc Oxide, ITZO) etc.
In this liquid crystal layer 30, this bistable state cholesteric liquid crystal molecule 301 is made of liquid crystal molecule (not shown) and chiral dope (not shown), this liquid crystal molecule with respect to 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 then is 5 to 20 weight parts.The foregoing liquid crystal molecule is the nematic liquid crystal molecule, and it is such as being ZLI-1221, ZLI-1291, ZLI-1565 or the ZLI-2293 (commercial numbering) etc. of Merck (Merck) company production.Aforementioned chiral dope is divided into left-handed photo etching and dextrorotation photo etching, and this left-handed photo etching is such as being S811 or S1011 (commercial numbering) etc.; This dextrorotation photo etching is such as being 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 the S/cm, be preferably between 10
-2S/cm to 10
5Between the 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 be between 15 how rice to 30000 how between the rice.In another embodiment of the present invention, this liquid crystal layer 30 also can comprise a polymerizable compound (not shown), and this polymerizable compound is liquid crystal active monomer (liquid crystal reactive monomers).
Below enumerate an embodiment and a comparative example and be illustrated bistable cholesteric sterol liquid-crystal composition in the liquid crystal layer 30 of the present invention for the concrete effect that reduces driving voltage.
Weigh at first respectively the ZLI-2293 liquid crystal molecule of Merck (Merck) the company production of 10 grams, the left-handed photo etching of S-811 that Merck (Merck) company of 1 gram produces, and the P-25 titanium dioxide fine particles produced of Degussa (Degussa) company of 0.2 gram (median size be about 30 how rice), 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 sterol liquid-crystal composition of the present invention, at last bistable cholesteric sterol liquid-crystal composition of the present invention are flow in this liquid crystal layer 30 and obtain cholesteric liquid crystal panel 1 of the present invention.
Comparative example 1
Except not comprising the P-25 titanium dioxide fine particles that Degussa (Degussa) company produces, prepare relatively a cholesteric liquid crystal panel with the method identical with embodiment 1.
See also Fig. 2, it is the as a result comparison diagram of the driving voltage of embodiment 1 and comparative example 1.The present invention has the bistable cholesteric sterol liquid-crystal composition (being embodiment 1) that adds the P-25 titanium dioxide fine particles compared to the bistable cholesteric sterol liquid-crystal composition that does not add the P-25 titanium dioxide fine particles (being comparative example 1) as shown in Figure 2, and the driving voltage of bistable cholesteric sterol liquid-crystal composition of the present invention is evident as lower.Do not add the bistable cholesteric sterol liquid-crystal composition (being comparative example 1) of P-25 titanium dioxide fine particles though had bistable characteristic, except contrast only is about 3 ~ 4, its driving voltage is the higher 15V that reaches also; Yet, bistable cholesteric sterol liquid-crystal composition of the present invention (being embodiment 1) is because there is the P-25 of interpolation titanium dioxide fine particles, so that its degree of birefringence △ n promotes, 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 sterol liquid-crystal composition of the present invention is the physical property of improving whole liquid crystal layer by the interpolation fine particle composition with the characteristic of utilizing its high refractive index, this fine particle composition is except reducing the driving voltage of liquid crystal layer, can also strengthen the scattering states (being contrast gradient) of liquid crystal layer, reach the bi-stable display effects of high contrast and low driving voltage, thereby solve the existing problem of prior art.
Although the present invention with preferred embodiment openly as above; so it is not to limit the present invention; the persond having ordinary knowledge in the technical field of the present invention; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking aforesaid the claim person of defining.
Claims (9)
1. a bistable cholesteric sterol liquid-crystal composition is characterized in that, is used for consisting of the liquid crystal layer of liquid crystal panel, and this bistable cholesteric sterol liquid-crystal composition comprises:
The bistable state cholesteric liquid crystal molecule; And
Fine particle composition, the specific refractory power of this fine particle composition are between 1.5 to 3.
2. bistable cholesteric sterol liquid-crystal composition as claimed in claim 1 is characterized in that, the electric conductivity of this fine particle composition is between 10
-6S/cm to 10
5Between the S/cm.
3. bistable cholesteric sterol liquid-crystal composition as claimed in claim 2 is characterized in that, the electric conductivity of this fine particle composition is between 10
-2S/cm to 10
5Between the S/cm.
4. bistable cholesteric sterol 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 sterol liquid-crystal composition as claimed in claim 1, it is characterized in that, this bistable state cholesteric liquid crystal molecule comprises a liquid crystal molecule and a chiral dope, and with respect to this liquid crystal molecule of 100 weight parts, the content of this fine particle composition is 0.1 to 5 weight part.
6. bistable cholesteric sterol liquid-crystal composition as claimed in claim 5 is characterized in that, the content of this chiral dope is 5 to 20 weight parts.
7. bistable cholesteric sterol liquid-crystal composition as claimed in claim 1 is characterized in that, the particle diameter of this fine particle composition be between 15 how rice to 30000 how between the rice.
8. bistable cholesteric sterol liquid-crystal composition as claimed in claim 1 is characterized in that, this bistable cholesteric sterol liquid-crystal composition also comprises a polymerizable compound.
9. bistable cholesteric sterol liquid-crystal composition as claimed in claim 8 is characterized in that, this polymerizable compound is the liquid crystal active monomer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749825A (en) * | 2015-04-16 | 2015-07-01 | 京东方科技集团股份有限公司 | Liquid crystal box and manufacturing method thereof and display device |
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| 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 |
| US20080187687A1 (en) * | 2007-02-05 | 2008-08-07 | Fuji Xerox Co., Ltd. | Liquid crystal-containing composition, method of producing the same, and liquid crystal display device including the same |
| CN101382689A (en) * | 2008-10-21 | 2009-03-11 | 北京科技大学 | A preparation method of electronic paper material with magnetic addressing and magnetic erasing properties |
| 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 video display device |
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2013
- 2013-05-22 CN CN201310190952.XA patent/CN103361083B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| US20080187687A1 (en) * | 2007-02-05 | 2008-08-07 | Fuji Xerox Co., Ltd. | Liquid crystal-containing composition, method of producing the same, and liquid crystal display device including the same |
| 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 | A preparation method of electronic paper material with magnetic addressing and magnetic erasing properties |
| CN102375284A (en) * | 2010-08-19 | 2012-03-14 | 台达电子工业股份有限公司 | Switchable video display device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104749825A (en) * | 2015-04-16 | 2015-07-01 | 京东方科技集团股份有限公司 | Liquid crystal box and manufacturing method thereof and display device |
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