CN102732268A - Method for using doped nematic liquid crystal material to reduce rising edge response time of liquid crystal device - Google Patents
Method for using doped nematic liquid crystal material to reduce rising edge response time of liquid crystal device Download PDFInfo
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- CN102732268A CN102732268A CN2012101975067A CN201210197506A CN102732268A CN 102732268 A CN102732268 A CN 102732268A CN 2012101975067 A CN2012101975067 A CN 2012101975067A CN 201210197506 A CN201210197506 A CN 201210197506A CN 102732268 A CN102732268 A CN 102732268A
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Abstract
The invention relates to a method for using a doped nematic liquid crystal material to reduce the rising edge and falling edge response time of a liquid crystal device. The method is realized by acquiring a nematic liquid crystal material through a semiconductor nanoparticle doping method and preparing a liquid crystal device of a liquid crystal display. Specifically, a ZnO nanoparticle doped nematic liquid crystal material forms a uniform and stable liquid crystal mixture, which is utilized to prepare a liquid crystal display device. The beneficial effect of the invention is that the liquid crystal device employing the ZnO nanoparticle doped liquid crystal material has start voltage that can be effectively reduced, and the rising edge response time can be reduced.
Description
Technical field
The present invention relates to a kind of application that obtains the nematic liquid crystal material through the adulterated method of semi-conductor nano particles; Specifically be that ZnO nanoparticle doping nematic liquid crystal material is formed uniform and stable liquid crystal compound; And utilize this liquid crystal compound to prepare liquid crystal display device, reduce the method for liquid crystal device positive rise time of response.
Background technology
At present, liquid crystal material and liquid crystal display device have obtained widespread use, and the Along with people's growth in the living standard; Miniaturized and the removable developing direction that changes into to liquid-crystal display, for the duration of service that can make indicating meter longer, the capacity of the battery that one side need to improve; And it is on the other hand important; The power consumption that must seek liquid crystal display device constantly reduces, and only so, lcd technology could fully capture the market of mobile display.This patent just is being aimed at the power consumption that the method that how to adopt the doped semiconductor nanocrystal particle reduces liquid crystal display device.
The nanoparticle doping techniques is the method that easier synthetic non-chemically improves the liquid crystal material characteristic; Before present patent application; Carbon nanotube [1 has been arranged; 2], ferroelectricity nanoparticle [3-5], metal nanoparticle [6], metal oxide nanoparticles and semi-conductor nano particles, more than five types of nanoparticles in nematic liquid crystal, mix, material electric conductivity that all can be in various degree, improve or several of characteristics such as device contrast gradient, cut-in voltage, time of response.
The doping of carbon nanotube originates from the C60 material, although the liquid crystal material of doping C60 can obtain higher contrast ratio, because C60 is difficult to and liquid crystal material forms uniform and stable mixed liquid crystal material, so be not used widely.And the tubular form of carbon nanotube helps it in the direction of arranging along liquid crystal molecule, to arrange, and the E7 liquid crystal material that is doped with carbon nanotube can effectively reduce the cut-in voltage of liquid crystal device.The metal nanoparticle that is doped into liquid crystal mainly comprises the mixing material of one or more nanoparticles such as Pd, Ag; Liquid crystal molecule and metal nanoparticle form package structure in doping system; The device that utilizes adulterated liquid crystal material to make has based on warbled fast response characteristic, and can reduce the cut-in voltage of liquid crystal device.The doping of metal nanoparticle is mainly delivered by Japanese S. Kobayashi seminar.
Metal oxide nanoparticles (MgO) is also reported by S. Kobayashi; The adulterated liquid crystal device of process MgO nanoparticle has than cut-in voltage that the doped liquid crystal device is not lower and the response speed of Geng Gao, has reduced the operating temperature range of liquid crystal device simultaneously.
The research of semi-conductor nano particles doping nematic liquid crystal is reported by Xu Jun seminar; The cut-in voltage that doping CdS nanoparticle can reduce the 5CB liquid crystal device reaches 25%; Also reduced simultaneously transformation temperature, the also different and acquisition variation in various degree of the dielectric anisotropy of liquid crystal material and degree of order along with the size of adulterated concentration and institute's doped with nanometer particle through doped liquid crystal.But consider the toxicity of CdS nanoparticle, mix and use nanoparticle so continue to develop the liquid crystal of non-toxic and safe.
[1]?I.?Dierking,?G.?Scalia,?and?P.?Morales,?“Liquid?crystal-carbon?nanotube?dispersions”,?J.?Appl.?Phys.,?2005,?97:?044309.
[2]?W.?Lee,?C.?Y.?Wang,?and?Y.?C.?Shih,?“Effects?of?carbon?nanosolids?on?the?electro-optical?properties?of?a?twisted?nematic?liquid-crystal?host”,?Appl.?Phys.?Lett.,?2004,85:513.
[3]?US20040156008,?Y.?Reznikov,?A.?Glushchenko,?V.?Reshetnyak,?J.?West
[4]?US20070200093,?J.?West,?C.?Cheon,?A.?Glushchenko,?Y.?Reznikov,?F.?Li.
[5]?WO03060598,?Y.?Reznikov,?A.?Glushchenko,?V.?Reshetnyak,?J.?West
[6]?US20050079296,?S.?Kobayashi,?N.?Toshima,?J.?Thisayukta,?Y.?Shiraishi,?S.?Sano,?A.?Baba.
Summary of the invention
Technical problem to be solved by this invention is to mix and be used for the liquid crystal device of liquid-crystal display through the ZnO nanoparticle, reduces the liquid crystal device positive rise time of response.
Technical problem to be solved by this invention adopts following technical scheme to realize:
Utilize doping nematic liquid crystal material to reduce the method for liquid crystal device positive rise time of response, it is characterized in that: at first accomplish the synthetic of ZnO nanoparticle,
1, the 0.0012g Zinc diacetate dihydrate is dissolved among the 50mL DMSO (DMSO 99.8MIN.), ultra-sonic dispersion 20-30 minute, through 50 ℃ of oil baths;
2, the 1.5mL ultrapure water is scattered among the 48.5mL DMSO, proportioning is 3%, mixes with solution equal-volume in the step 1, and the reaction times is 30 minutes;
3, the ZnO nanoparticle, separates from solution after 20 minutes at 3500rpm through the centrifugal mode afterwards;
4, use acetone and ultrapure water washing through isolating ZnO nanoparticle, and be dispersed in the ultrapure water.
The parcel of ZnO nanoparticle
The ultrapure water that 1, will be dispersed with the ZnO nanoparticle is transferred in the reaction vessel, adds the 10mL tensio-active agent, ultra-sonic dispersion 30 minutes;
2, in 75 ℃ of oil baths, add methylacrylic acid, TEB 3K and reaction initiator mixing solutions;
3, reaction finished after 8 hours, and through 12000rpm, after 30 minutes centrifugation, the ZnO nanoparticle that parcel is good is separated from solution.
Above-mentioned synthetic and wrap up in the above ZnO nanoparticle, said reaction parameter is merely an embodiment, and the adjustment reaction parameter can obtain the ZnO nanoparticle of different size.
Next accomplishes ZnO nanoparticle doping nematic liquid crystal;
1, the ZnO nanoparticle is dispersed in the normal hexane; According to doping content 0.01wt%-1wt% the 5CB liquid crystal of corresponding mass is splashed into hexane solution (for example the 0.0022g Zinc diacetate dihydrate can prepare about 0.81mgZnO nanoparticle, and doping content need add the 0.809g5CB liquid crystal during for 0.1wt%);
2, the method through rotary evaporation (80rpm, 80 ℃) and vacuum-drying (104Pa, 80 ℃) is dispersed in nanoparticle among the 5CB.
The size of said nanoparticle and doping content will influence the performance of liquid crystal material and device, and its size range is 3nm-30nm, wherein preferable range is 5-15nm; Doping content is 0.01wt%-1wt%, and wherein preferable range is 0.1wt%-0.2wt%.
At last with the liquid crystal device of the nematic liquid crystal material prepn liquid-crystal display that is doped with the ZnO nanoparticle in the aforesaid method; The said liquid crystal device of preparing; Through the size and the doping content of control nanoparticle, realize reducing the method for liquid crystal device positive rise time of response.
Beneficial effect of the present invention can effectively reduce the positive rise time of response of nematic liquid crystal device.
Description of drawings
Fig. 1 is the transmitance-voltage curve of 20nmZnO nanoparticle of the present invention with 0.1wt% and 0.2wt% doped in concentrations profiled 5CB liquid crystal cell and pure 5CB liquid crystal cell.
Fig. 2 is the preparation flow synoptic diagram of doping zinc oxide nanometer particle nematic liquid crystal material of the present invention.
Fig. 3 is the comparison of four kinds of embodiment positive rise time of response of the present invention and pure 5CB liquid crystal cell.
Fig. 4 is the comparison of four kinds of embodiment negative edge time of response of the present invention and pure 5CB liquid crystal cell.
Embodiment
For technique means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram and embodiment, further set forth the present invention.
Be illustrated in figure 1 as the transmitance-voltage curve of 20nmZnO nanoparticle with 0.1wt% and 0.2wt% doped in concentrations profiled 5CB liquid crystal cell and pure 5CB liquid crystal cell.Wherein pure 5CB liquid crystal cell cut-in voltage is 1.12V, and doping content is that the liquid crystal cell cut-in voltage of 0.1wt% is 1.00V, and doping content is that the liquid crystal cell cut-in voltage of 0.1wt% is 0.86V, has reduced by 10.71% and 23.21% respectively.
As shown in Figure 2, utilize doping nematic liquid crystal material to realize reducing liquid crystal device positive rise, negative edge time of response, realize through following method,
At first accomplish synthetic ZnO nanoparticle:
1, respectively 0.0012g and 0.0006g Zinc diacetate dihydrate (nanoparticle of corresponding respectively preparation 20nm and 10nm) are dissolved among the 50mL DMSO (DMSO 99.8MIN.), ultra-sonic dispersion 20-30 minute, through 50 ℃ of oil baths;
2, the 1.5mL ultrapure water is scattered among the 48.5mL DMSO, proportioning is 3%, mixes with solution equal-volume in the step 1, and the reaction times is 30 minutes;
3, the ZnO nanoparticle, separates from solution after 20 minutes at 3500rpm through the centrifugal mode afterwards;
4, use acetone and ultrapure water washing through isolating ZnO nanoparticle, and be dispersed in the ultrapure water.
Parcel ZnO nanoparticle:
The ultrapure water that 1, will be dispersed with the ZnO nanoparticle is transferred in the reaction vessel, adds the 10mL tensio-active agent, ultra-sonic dispersion 30 minutes;
2, in 75 ℃ of oil baths, add methylacrylic acid, TEB 3K and reaction initiator mixing solutions;
3, reaction finished after 8 hours, and through 12000rpm, after 30 minutes centrifugation, the ZnO nanoparticle that parcel is good is separated from solution.
Next accomplishes ZnO nanoparticle doping nematic liquid crystal
1, the ZnO nanoparticle is dispersed in the normal hexane; According to doping content 0.1wt% and 0.2wt% the 5CB liquid crystal of corresponding mass is splashed into hexane solution (for example the 0.0012g Zinc diacetate dihydrate can prepare about 0.44mgZnO nanoparticle, and doping content need add the 0.443g5CB liquid crystal during for 0.1wt%).And do not prepare 10nm 0.1wt%, 10nm 0.2wt%, 20nm 0.1wt%, four instances of 20nm 0.2wt%.
2, the method through rotary evaporation (80rpm, 80 ℃) and vacuum-drying (104Pa, 80 ℃) is dispersed in nanoparticle among the 5CB.
Prepare liquid crystal device at last, oriented layer adopts parallel-oriented polyimide preparation, carries out friction orientation with the degree of depth of 0.1mm and the rate of feed of 5mm/s with flannelette, and differently-oriented directivity is mutually orthogonal between first, second substrate.Liquid crystal cell is thick to be 5 μ m, pours into the nematic phase 5CB liquid crystal of the ZnO nanoparticle that mixed.Through the size and the doping content of control nanoparticle, realize reducing the liquid crystal device positive rise time of response like this.
Like Fig. 3 and shown in Figure 4, contrast for choosing four kinds of 5CB liquid crystal cell and pure 5CB liquid crystal cell positive rise, negative edge time of response that are doped with the ZnO nanoparticle.Liquid crystal device can complete opening the 3V driven time; The positive rise time of response of ZnO:5CB liquid crystal device is all less than pure 5CB liquid crystal device; And the negative edge time of response under each voltage a little more than pure 5CB liquid crystal device, thereby played the effect that realizes reducing liquid crystal device positive rise time of response.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification sheets just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (5)
1. utilize doping nematic liquid crystal material to reduce the method for liquid crystal device positive rise time of response, it is characterized in that: at first accomplish the synthetic of ZnO nanoparticle,
A, respectively 0.0012g and 0.0006g Zinc diacetate dihydrate are dissolved among the 50mL DMSO, ultra-sonic dispersion 20-30 minute, through 50 ℃ of oil baths;
B, the 1.5mL ultrapure water is scattered among the 48.5mL DMSO, proportioning is 3%, mixes with solution equal-volume among the step a, and the reaction times is 30 minutes;
C, the ZnO nanoparticle at 3500rpm, separated from solution after 20 minutes through the centrifugal mode afterwards;
D, the isolating ZnO nanoparticle of process use acetone and ultrapure water washing, and are dispersed in the ultrapure water;
Parcel ZnO nanoparticle:
A, the ultrapure water that will be dispersed with the ZnO nanoparticle are transferred in the reaction vessel, add the 10mL tensio-active agent, ultra-sonic dispersion 30 minutes;
B, in 75 ℃ of oil baths, add methylacrylic acid, TEB 3K and reaction initiator mixing solutions;
C, reaction finished after 8 hours, and through 12000rpm, after 30 minutes centrifugation, the ZnO nanoparticle that parcel is good is separated from solution;
Next accomplishes ZnO nanoparticle doping nematic liquid crystal;
A, the ZnO nanoparticle is dispersed in the normal hexane, the 5CB liquid crystal of corresponding mass is splashed into hexane solution according to doping content 0.1wt% and 0.2wt%;
B, through rotary evaporation 80rpm, 80 ℃ with vacuum-drying 104Pa, 80 ℃ of methods are dispersed in nanoparticle among the 5CB;
The liquid crystal device realization reduction positive rise, the negative edge time of response that at last the nematic liquid crystal material that is doped with the ZnO nanoparticle in the aforesaid method are prepared liquid-crystal display.
2. according to the said method of claim 1, it is characterized in that: said synthetic and wrap up in the above ZnO nanoparticle, reaction parameter is merely an embodiment, and the adjustment reaction parameter can obtain the ZnO nanoparticle of different size.
3. according to the said method of claim 2, it is characterized in that: the size of said nanoparticle and doping content will influence the performance of liquid crystal material and device, and its size range is that 3nm-30nm, doping content are 0.01wt%-1wt%.
4. according to the said method of claim 3, it is characterized in that: the gravel size decision scope of said nanoparticle is 5-15nm.
5. according to the said method of claim 3, it is characterized in that: said nanoparticle doping content preferable range is 0.1wt%-0.2wt%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102722047A (en) * | 2012-06-15 | 2012-10-10 | 中能柔性光电（滁州）有限公司 | Method for reducing threshold voltage of liquid crystal device by aid of doped nematic liquid crystal material |
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| US6426786B1 (en) * | 1999-06-01 | 2002-07-30 | International Business Machines Corporation | Method of homeotropic alignment or tilted homeotropic alignment of liquid crystals by single oblique evaporation of oxides and liquid crystal display device formed thereby |
| US20040156008A1 (en) * | 2002-01-10 | 2004-08-12 | Yurii Reznikov | Material for liquid crystal cell |
| US20050079296A1 (en) * | 2003-04-14 | 2005-04-14 | Shunsuke Kobayashi | Liquid crystal-soluble particle, method for manufacturing the same and liquid crystal device element |
| CN102722047A (en) * | 2012-06-15 | 2012-10-10 | 中能柔性光电（滁州）有限公司 | Method for reducing threshold voltage of liquid crystal device by aid of doped nematic liquid crystal material |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6426786B1 (en) * | 1999-06-01 | 2002-07-30 | International Business Machines Corporation | Method of homeotropic alignment or tilted homeotropic alignment of liquid crystals by single oblique evaporation of oxides and liquid crystal display device formed thereby |
| US20040156008A1 (en) * | 2002-01-10 | 2004-08-12 | Yurii Reznikov | Material for liquid crystal cell |
| US20050079296A1 (en) * | 2003-04-14 | 2005-04-14 | Shunsuke Kobayashi | Liquid crystal-soluble particle, method for manufacturing the same and liquid crystal device element |
| CN102722047A (en) * | 2012-06-15 | 2012-10-10 | 中能柔性光电（滁州）有限公司 | Method for reducing threshold voltage of liquid crystal device by aid of doped nematic liquid crystal material |
Non-Patent Citations (1)
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| CN102722047A (en) * | 2012-06-15 | 2012-10-10 | 中能柔性光电（滁州）有限公司 | Method for reducing threshold voltage of liquid crystal device by aid of doped nematic liquid crystal material |
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Application publication date: 20121017 |