CN102732267A - Liquid crystal device prepared by ZnO nanoparticle doping and used for liquid crystal displays - Google Patents
Liquid crystal device prepared by ZnO nanoparticle doping and used for liquid crystal displays Download PDFInfo
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- CN102732267A CN102732267A CN2012101974539A CN201210197453A CN102732267A CN 102732267 A CN102732267 A CN 102732267A CN 2012101974539 A CN2012101974539 A CN 2012101974539A CN 201210197453 A CN201210197453 A CN 201210197453A CN 102732267 A CN102732267 A CN 102732267A
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Abstract
The invention relates to a liquid crystal device that is prepared from a nematic liquid crystal material obtained by a semiconductor nanoparticle doping method and is used for preparation of liquid crystal displays. Specifically, a ZnO nanoparticle doped nematic liquid crystal material is combined into a uniform and stable liquid crystal mixture, which is then utilized to prepare the liquid crystal display device. The liquid crystal device adopting the ZnO nanoparticle doped liquid crystal material can have effectively reduced start voltage and can reduce the rising edge response time.
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 that this liquid crystal compound prepares liquid crystal display device.
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, improves the electro-optical characteristic of device.
Technical problem to be solved by this invention adopts following technical scheme to realize.
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%.
The liquid crystal device that at last the nematic liquid crystal material that is doped with the ZnO nanoparticle in the aforesaid method is prepared liquid-crystal display; It is characterized in that; Said liquid crystal device comprises first substrate and second substrate; Between described first substrate and second substrate, respectively being enclosed with conductive layer, oriented layer, is separating ball between the said oriented layer.
The invention has the beneficial effects as follows the liquid crystal device that adopts the adulterated liquid crystal material of ZnO nanoparticle, its cut-in voltage can effectively reduce, and reduces the corresponding time of positive rise.
Description of drawings
Fig. 1 is the preparation flow synoptic diagram of doping zinc oxide nanometer particle nematic liquid crystal material of the present invention.
Fig. 2 is the structural representation through the liquid crystal device of Fig. 1 ZnO nanoparticle nematic liquid crystal material prepn.
Fig. 3 adopts instance and the transmitance-voltage curve of pure 5CB liquid crystal cell of four liquid crystal devices of nanoparticle doped liquid crystal material prepn.
Fig. 4 is the comparison of corresponding time of the positive rise of four instances and pure 5CB liquid crystal cell.
Fig. 5 is the comparison of corresponding time of the negative edge of four instances 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.
Mix and be used for the liquid crystal device of liquid-crystal display through the ZnO nanoparticle,
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, the liquid crystal device structure is as shown in Figure 2, and 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.
Fig. 3 is the instance of four liquid crystal devices of employing nanoparticle doped liquid crystal material prepn and the transmitance-voltage curve of pure 5CB liquid crystal cell.Wherein pure 5CB liquid crystal cell cut-in voltage is 1.12V; The liquid crystal cell of doping 10nm 0.1wt% is that 1.06V, 10nm 0.2wt% are that 1.01V, 20nm 0.1wt% are that 1.00V, 20nm 0.2wt% are 0.86V, has reduced by 5.36%, 9.82%, 10.71% and 23.21% respectively.
Fig. 4, Fig. 5 are the comparison of positive rise, negative edge time of response and the pure 5CB liquid crystal cell of four instances.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.
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 (6)
1. mix through the ZnO nanoparticle and be used for the liquid crystal device of liquid-crystal display, it is characterized in that: at first accomplish synthetic 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 that at last the nematic liquid crystal material that is doped with the ZnO nanoparticle in the aforesaid method is prepared liquid-crystal display.
2. mix and be used for the liquid crystal device of liquid-crystal display through the ZnO nanoparticle according to claim 1 is said; 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. mix and be used for the liquid crystal device of liquid-crystal display through the ZnO nanoparticle according to claim 2 is said; 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. mix and be used for the liquid crystal device of liquid-crystal display through the ZnO nanoparticle according to claim 3 is said, it is characterized in that: the gravel size decision scope of said nanoparticle is 5-15nm.
5. mix and be used for the liquid crystal device of liquid-crystal display through the ZnO nanoparticle according to claim 3 is said, it is characterized in that: said nanoparticle doping content preferable range is 0.1wt%-0.2wt%.
6. mix and be used for the liquid crystal device of liquid-crystal display through the ZnO nanoparticle according to claim 3 is said; It is characterized in that: said liquid crystal device comprises first substrate and second substrate; Between described first substrate and second substrate, respectively being enclosed with conductive layer, oriented layer, is separating ball between the said oriented layer.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472611A (en) * | 2013-09-05 | 2013-12-25 | 京东方科技集团股份有限公司 | Liquid crystal display panel, and manufacturing method and display device of liquid crystal display panel |
| WO2015070479A1 (en) * | 2013-11-15 | 2015-05-21 | 深圳市华星光电技术有限公司 | Method for measuring water in liquid crystal |
| CN107141388A (en) * | 2017-05-26 | 2017-09-08 | 贵州大学 | PMMA/oxidized zinc temperature sensing material and preparation method thereof |
| CN109207171A (en) * | 2018-08-24 | 2019-01-15 | 华南师范大学 | A kind of application of liquid crystal device and metal oxide nanoparticles in the liquid crystal device |
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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 |
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2012
- 2012-06-15 CN CN2012101974539A patent/CN102732267A/en active Pending
Patent Citations (3)
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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 |
Non-Patent Citations (1)
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| 张天翼: "半导体纳米粒子掺杂液晶的材料、器件和机理研究", 《复旦大学博士学位论文》, 31 March 2010 (2010-03-31), pages 55 - 67 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472611A (en) * | 2013-09-05 | 2013-12-25 | 京东方科技集团股份有限公司 | Liquid crystal display panel, and manufacturing method and display device of liquid crystal display panel |
| CN103472611B (en) * | 2013-09-05 | 2016-05-25 | 京东方科技集团股份有限公司 | A kind of display panels and preparation method thereof, display unit |
| WO2015070479A1 (en) * | 2013-11-15 | 2015-05-21 | 深圳市华星光电技术有限公司 | Method for measuring water in liquid crystal |
| CN107141388A (en) * | 2017-05-26 | 2017-09-08 | 贵州大学 | PMMA/oxidized zinc temperature sensing material and preparation method thereof |
| CN109207171A (en) * | 2018-08-24 | 2019-01-15 | 华南师范大学 | A kind of application of liquid crystal device and metal oxide nanoparticles in the liquid crystal device |
| CN109207171B (en) * | 2018-08-24 | 2022-02-01 | 华南师范大学 | Liquid crystal device and application of metal oxide nanoparticles in liquid crystal device |
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Application publication date: 20121017 |