CN103361079A - Polymer dispersion type liquid crystal component and preparation method thereof - Google Patents
Polymer dispersion type liquid crystal component and preparation method thereof Download PDFInfo
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- CN103361079A CN103361079A CN2012100875593A CN201210087559A CN103361079A CN 103361079 A CN103361079 A CN 103361079A CN 2012100875593 A CN2012100875593 A CN 2012100875593A CN 201210087559 A CN201210087559 A CN 201210087559A CN 103361079 A CN103361079 A CN 103361079A
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Abstract
The invention discloses a polymer dispersion type liquid crystal component for reducing the drive voltage of a polymer dispersion type liquid crystal display. The polymer dispersion type liquid crystal component comprises a polymer material, a plurality of liquid crystal molecules and a plurality of non-conductive particles, wherein the liquid crystal molecules are dispersed in the polymer material and are positioned in a plurality of liquid crystal spheres formed by the polymer material; the non-conductive particles are dispersed in the polymer material.
Description
Technical field
The present invention relates to a kind of being used in and reduces polymer-dispersed liquid crystal (polymer dispersed liquid crystal, PDLC) the polymer-dispersed liquid crystal constituent of the driving voltage of indicating meter with and manufacture method, particularly a kind of utilize non-conductive particle part substituted polymer material in order to the polymer-dispersed liquid crystal constituent that reduces driving voltage with and manufacture method.
Background technology
Polymer-dispersed liquid crystal (polymer dispersed liquid crystal, PDLC) principle of operation is to utilize refractive index difference and the collocation of control liquid crystal molecule degree of birefringence and polymer materials, in order to form two kinds of different states of transparent and scattering.Please refer to Fig. 1 and Fig. 2, Fig. 1 and the synoptic diagram that Figure 2 shows that traditional polymer-dispersed liquid crystal.Wherein Fig. 1 is not for applying situation synoptic diagram under the voltage to polymer-dispersed liquid crystal, and Fig. 2 is for applying the situation synoptic diagram under the voltage to polymer-dispersed liquid crystal.Such as Fig. 1 and shown in Figure 2, traditional polymer-dispersed liquid crystal 100 comprises a polymer materials 111 and a plurality of liquid crystal molecule 120.Liquid crystal molecule 120 is that scattering device is in polymer materials 111 formed a plurality of liquid crystal balls 112.Polymer materials 111 has a refractive index n
1, and each liquid crystal molecule 120 has a parallel shafts to refractive index n
2An and vertical axial refractive index n
3Generally speaking, the parallel shafts of liquid crystal molecule 120 is to refractive index n
2Preferably be equal to substantially the refractive index n of polymer materials 111
1, with so that when polymer-dispersed liquid crystal 100 is applied voltage (as shown in Figure 2), the specific refractory power that each liquid crystal molecule 120 presents in the consistent orientation is close with polymer materials 111, and is conducive to present better transparent situation.In other words, when polymer-dispersed liquid crystal 100 is applied voltage, because the parallel shafts of liquid crystal molecule 120 is to refractive index n
2Refractive index n with polymer materials 111
1Close, so the light L1 of incident polymer-dispersed liquid crystal 100 can not be subject to polymer-dispersed liquid crystal 100 and form the light L2 that penetrates.Relatively, when polymer-dispersed liquid crystal 100 not being applied voltage (as shown in Figure 1), the liquid crystal molecule 120 of position in each liquid crystal ball 112 is to be irregular arrangement, so the light L1 of incident polymer-dispersed liquid crystal 100 can be dispersed into variant direction.
Yet the place that PDLC behaves and denounce most is that its driving voltage is too high.To this, the mode that is used for traditionally reducing driving voltage comprises and reduces thickness of liquid crystal box, adds the mode such as conducting particles.Yet the former can cause contrast gradient to descend, and thickness is limited to; Latter might cause the polymer materials conduction, and exists the problem that the manufacturing of electrically conducting transparent material is difficult for, cost is higher.
Summary of the invention
Main purpose of the present invention is providing a kind of being used in to reduce polymer-dispersed liquid crystal (polymer dispersed liquid cRYstal, PDLC) the polymer-dispersed liquid crystal constituent of the driving voltage of indicating meter with and manufacture method, in the polymer-dispersed liquid crystal constituent, add non-conductive particle, in order to reaching the purpose that reduces driving voltage, and can improve dispersion effect.
The invention provides a kind of polymer-dispersed liquid crystal constituent that is used in the driving voltage that reduces polymer dispersion type liquid crystal display device, comprise a polymer materials, a plurality of liquid crystal molecule and a plurality of non-conductive particle.Liquid crystal molecule be scattering device in polymer materials, and liquid crystal molecule be the position in the formed a plurality of liquid crystal balls of polymer materials.Non-conductive particle is that scattering device is in polymer materials.
The invention provides a kind of polymer-dispersed liquid crystal constituent, comprise a polymer materials, a plurality of liquid crystal molecule and a plurality of non-conductive particle.Liquid crystal molecule be scattering device in polymer materials, and liquid crystal molecule be the position in the formed a plurality of liquid crystal balls of polymer materials.Non-conductive particle is that scattering device is in polymer materials, in order to reduce the driving voltage of polymer-dispersed liquid crystal.
The invention provides a kind of manufacture method that is used in the polymer-dispersed liquid crystal constituent of the driving voltage that reduces polymer dispersion type liquid crystal display device, comprise the following steps, at first, one synthetics material and a plurality of liquid crystal molecule are provided, and the synthetics material comprises a polyreaction material and a plurality of non-conductive particle.Then, mix synthetics material and liquid crystal molecule.Then, carry out an aggregation processing, with so that the polyreaction material aggregates into a polymer materials, and liquid crystal molecule and non-conductive particle are dispersed in the polymer materials.Liquid crystal molecule is that the position is in the formed a plurality of liquid crystal balls of polymer materials.
Description of drawings
Fig. 1 and the synoptic diagram that Figure 2 shows that traditional polymer-dispersed liquid crystal.
Figure 3 shows that the synoptic diagram of the polymer-dispersed liquid crystal constituent of a preferred embodiment of the present invention.
Fig. 4 and the synoptic diagram that Figure 5 shows that the display unit of a preferred embodiment of the present invention.
Figure 6 shows that the manufacture method schematic flow sheet of the polymer-dispersed liquid crystal constituent of a preferred embodiment of the present invention.
Wherein, description of reference numerals is as follows:
100 polymer-dispersed liquid crystals, 111 polymer materialss
112 liquid crystal balls, 120 liquid crystal molecules
200 polymer-dispersed liquid crystal constituents, 210 polyreaction materials
211 polymer materialss, 212 liquid crystal balls
220 liquid crystal molecules, 230 non-conductive particles
240 synthetics materials, 300 display unit
Substrate in 311 times substrates 312
321 lower electrodes, 322 top electrodes
D particle diameter L1 light
L2 light L3 light
L4 light n
1Specific refractory power
n
2Refractive index n
3Specific refractory power
n
4Refractive index n
5Specific refractory power
n
6Refractive index n
7Specific refractory power
S110 step S120 step
The S130 step
Embodiment
Please refer to Fig. 3.Figure 3 shows that the synoptic diagram of the polymer-dispersed liquid crystal constituent that is used in the driving voltage that reduces polymer-dispersed liquid crystal (polymer dispersed liquid crystal, PDLC) indicating meter of a preferred embodiment of the present invention.For convenience of description, each accompanying drawing of present embodiment is only for illustrating that in order to easy understanding the present invention its detailed ratio can be adjusted according to the demand of design.As shown in Figure 3, present embodiment provides a polymer-dispersed liquid crystal constituent 200, and this polymer-dispersed liquid crystal constituent 200 comprises a polymer materials 211, a plurality of liquid crystal molecule 220 and a plurality of non-conductive particle 230.Liquid crystal molecule 220 be scattering device in polymer materials 211, and liquid crystal molecule 220 be the position in polymer materials 211 formed a plurality of liquid crystal balls 212.Non-conductive particle 230 is that scattering device is in polymer materials 211, in order to reduce the driving voltage of polymer-dispersed liquid crystal constituent 200.
In the present embodiment, non-conductive particle 230 can comprise organic polymer particles or inorganic particulate.The material of above-mentioned organic polymer particle can comprise polymethylmethacrylate (polymethyl methacrylate, PMMA), silica gel (silicone), acryl glue, polystyrene foamed (being commonly called as Baolilong) or other organic polymer materials that is fit to, and the material of above-mentioned inorganic particulate can comprise silicon oxide, titanium oxide, zirconium white, zinc oxide or other inorganic materials that is fit to.What deserves to be explained is that the non-conductive particle 230 of present embodiment is preferably the polymethylmethacrylate particle, but not as limit.One particle diameter D of each non-conductive particle 230 is situated between between 0.3 micron to 10 microns, and preferably is situated between at 1 micron to 3 microns in order to reach better effect.In addition, liquid crystal molecule 220 can comprise eurymeric liquid crystal molecule or other liquid crystal kinds that is fit to, and polymer materials 211 can comprise ultraviolet hardening resin (being commonly called as UV glue), thermoplastic resin or other polymer materialss that is fit to, that is to say, liquid crystal molecule and polymer materials generation are separated and form the material of liquid crystal ball, all be useful in the present invention, so this part has been routine techniques, so no longer this gives unnecessary details.What deserves to be explained is that the liquid crystal molecule 220 of present embodiment has a parallel shafts to refractive index n
5An and vertical axial refractive index n
6, and the parallel shafts of liquid crystal molecule 220 is to refractive index n
5Preferably be equal to substantially a refractive index n of polymer materials 211
4, with so that when polymer-dispersed liquid crystal constituent 200 is applied voltage, the specific refractory power that each liquid crystal molecule 220 presents in the consistent orientation is close with polymer materials 111, and is favourablely presenting better transparent situation.In addition, the refractive index n of polymer materials 211
4Preferably equal substantially a refractive index n of each non-conductive particle 230
7, in order to avoid having influence on preformed transparent situation because non-conductive particle 230 is set.The present invention is by non-conductive particle 230 part substituted polymer materials 211 shared component proportions in polymer-dispersed liquid crystal constituent 200, increase in polymer-dispersed liquid crystal constituent 200, pass through interface (interface) number on the path of light, and improve at the dispersion effect that does not drive under polymer-dispersed liquid crystal constituent 200 situations, also be conducive to reduce the driving voltage of polymer-dispersed liquid crystal constituent 200.
Please refer to Fig. 4 and Fig. 5, and please in the lump with reference to figure 3.Fig. 4 and the synoptic diagram that Figure 5 shows that the display unit of a preferred embodiment of the present invention.To shown in Figure 5, present embodiment provides a display unit 300, comprises substrate 312 on a top electrode 322, the lower electrode 321,, substrate once 311 and a polymer-dispersed liquid crystal constituent 200 such as Fig. 3.Lower electrode 321 and top electrode 322 corresponding settings, and lower electrode 321 is to be separately positioned in lower substrate 311 and the upper substrate 312 with top electrode 322.Polymer-dispersed liquid crystal constituent 200 is arranged between top electrode 322 and the lower electrode 321.Composition and the material behavior of polymer-dispersed liquid crystal constituent 200 illustrate in foregoing, at this and repeat no more.What deserves to be explained is, when applying voltage via top electrode 322 and 321 pairs of polymer-dispersed liquid crystal constituents 200 of lower electrode (as shown in Figure 5), liquid crystal molecule 220 in each liquid crystal ball 212 is to arrange with a vertical mode substantially, forms the light L4 that penetrates so that a light L3 of incident display unit 300 can pass polymer-dispersed liquid crystal constituent 200.Relatively, when polymer-dispersed liquid crystal constituent 200 not being applied voltage (as shown in Figure 4), the liquid crystal molecule 220 of position in each liquid crystal ball 212 is to be irregular arrangement, so the light L3 of incident display unit 300 can be dispersed into variant direction.In other words, the display unit 300 of present embodiment is to reach transparent and display effect scattering by liquid crystal molecule 220 situations in the control polymer-dispersed liquid crystal constituent 200.In addition, in other preferred embodiments of the present invention, also can colored filter be set in display unit 300 or in polymer-dispersed liquid crystal constituent 200, add the effect that coloring material shows in order to reach colour, but not as limit.
Please refer to Fig. 6, and please in the lump with reference to figure 3.Figure 6 shows that the manufacture method schematic flow sheet of the polymer-dispersed liquid crystal constituent of a preferred embodiment of the present invention.Such as Fig. 3 and shown in Figure 6, present embodiment provides a kind of manufacture method of polymer-dispersed liquid crystal constituent 200, comprises the following steps.At first, carry out step S110, a synthetics material 240 and a plurality of liquid crystal molecule 220 are provided.Synthetics material 240 comprises a polyreaction material 210 and a plurality of non-conductive particles 230.Then, carry out step S120, mix synthetics material 240 and liquid crystal molecule 220.Afterwards, carry out step S130, carry out an aggregation processing, with so that polyreaction material 210 aggregates into a polymer materials 211, and liquid crystal molecule 220 and non-conductive particle 230 are dispersed in the polymer materials 211.Liquid crystal molecule 220 is that the position is in polymer materials 211 formed a plurality of liquid crystal balls 212.Composition and the material behavior of the polymer-dispersed liquid crystal constituent 200 of present embodiment illustrate in foregoing, at this and repeat no more.What deserves to be explained is, the aggregation processing of present embodiment can comprise Polymerizing phase splitting method (polymerization induced phase separation, PIPS), temperature split-phase method (temperature induced phase separation, TIPS), solvent split-phase method (solvent induced phase separation, SIPS) or other methods that is fit to.In addition, the polyreaction material 210 of present embodiment can comprise a monomer material (not shown) and a smooth initiator (not shown).Above-mentioned monomer material can comprise that UV glue monomer or other are fit to can be in order to forming the monomer material of polyreaction, and above-mentioned light initiator is with so that monomer material carries out polyreaction.What deserves to be explained is, comparatively speaking, because the present invention is the polyreaction material 210 that replaces part with non-conductive particle 230, so therefore polyreaction material 210 and the ratio of light initiator in polymer-dispersed liquid crystal constituent 200 wherein can reduce, and then can improve originally the negative impact that the ion residues because of the light initiator may cause, for example film flicker when carrying out Presentation Function (flicker) problem.
Table 1
Example
Improve effect in order to further specify non-conductive particle shared component proportions in the polymer-dispersed liquid crystal constituent for the driving voltage of polymer-dispersed liquid crystal constituent, please refer to table 1.Table 1 tabular has gone out the component proportions variation of the middle polyreaction material (present embodiment is UV glue monomer) of polymer-dispersed liquid crystal constituent (liquid crystal molecule of present embodiment is the eurymeric liquid crystal) and non-conductive particle (present embodiment is PMMA) for the situation that affects of driving voltage.As shown in table 1, in the first comparative example of the present invention, the second comparative example, first implement sample attitude, second and implement sample attitude and the 3rd and implement in the sample attitude, be under the situation of fixing liquid crystal molecule proportion (weight percent 70%), change respectively the component proportions of polyreaction material and non-conductive particle.The first comparative example and the second comparative example are only to have respectively 30% polyreaction material or 30% non-conductive particle, volt still can't drive its polymer-dispersed liquid crystal constituent and apply voltage to 30 under this situation.Relatively, implementing sample attitude, the second enforcement sample attitude and the 3rd component proportions of implementing non-conductive particle in the sample attitude by first increases gradually, also can say under the increasing situation of ratio of non-conductive particle part substituted polymer material, can obtain driving voltage and also little by little descend.In fact, not only the illustrated ratio of table 1 can reach this effect, as long as with non-conductive particle part substituted polymer material, just can reach the effect of the driving voltage that reduces the polymer-dispersed liquid crystal constituent.In the present embodiment, non-conductive particle shared ratio in the polymer-dispersed liquid crystal constituent is to be situated between 1% to 30% substantially, and preferably be situated between 10% to 20%, the ratio that non-conductive particle replaces the polyreaction material preferably is situated between 33% to 67%.In other words, non-conductive particle shared ratio in the synthetics material is to be situated between between 33% to 67%, but not as limit.In addition, polymer materials shared ratio in the polymer-dispersed liquid crystal constituent is to be situated between 10% to 30% substantially, and liquid crystal molecule shared ratio in the polymer-dispersed liquid crystal constituent is to be situated between 70% to 90% substantially, but not as limit.Different (Polymerizing phase splitting method described above, temperature split-phase method or the solvent split-phase methods etc.) of the polymerization methods that also note that ratio visible liquid crystal molecule and the different of polyreaction material in the above-mentioned table 1 and adopt and adjusting to some extent.For instance, generally in the Polymerizing phase splitting method, the shared ratio of liquid crystal molecule more often is to be situated between 60% to 90%, and the ratio of polyreaction material (for example UV glue) is to be situated between between 10% to 40%, under this situation, replace the polyreaction material with non-conductive particle, the effect that reduces driving voltage is also arranged, and trend also is along with substitute proportion is higher, it is more to reduce driving voltage.As from the foregoing, the data of table 1 are not to limit the present invention, only are to illustrate the effect that reduces driving voltage.In addition, a particle diameter of each non-conductive particle is to be situated between between 0.3 micron to 10 microns substantially, and the particle diameter of each non-conductive particle preferably is situated between between 1 micron to 3 microns, in order to reach better effect.The specific refractory power of polymer materials preferably equals the specific refractory power of each non-conductive particle substantially, in order to avoid having influence on preformed transparent situation because non-conductive particle is set.
Comprehensive the above, polymer-dispersed liquid crystal constituent of the present invention is partly to replace synthetics material shared component proportions in the polymer-dispersed liquid crystal constituent by non-conductive particle.The driving voltage of polymer-dispersed liquid crystal constituent can be because polymer materials shared component proportions in the polymer-dispersed liquid crystal constituent reduces with reduction, and also can increase in addition on the one hand in the polymer-dispersed liquid crystal constituent, pass through interface number on the path of light, and improve at the dispersion effect that does not drive under the polymer-dispersed liquid crystal constituent situation, so can reaching simultaneously, polymer-dispersed liquid crystal constituent of the present invention reduces driving voltage and the purpose that improves dispersion effect.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a polymer-dispersed liquid crystal constituent that is used in the driving voltage that reduces polymer dispersion type liquid crystal display device is characterized in that, comprising:
One polymer materials;
A plurality of liquid crystal molecules, scattering device are in this polymer materials, and wherein these a plurality of liquid crystal molecules are that the position is in the formed a plurality of liquid crystal balls of this polymer materials; And
A plurality of non-conductive particles, scattering device is in this polymer materials.
2. polymer-dispersed liquid crystal constituent as claimed in claim 1, it is characterized in that, these a plurality of non-conductive particles shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 1% to 30%, this polymer materials shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 10% to 30%, and these a plurality of liquid crystal molecules shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 70% to 90%.
3. polymer-dispersed liquid crystal constituent as claimed in claim 1 is characterized in that, respectively a particle diameter of this non-conductive particle is to be situated between between 0.3 micron to 10 microns.
4. a polymer-dispersed liquid crystal constituent is characterized in that, comprising:
One polymer materials;
A plurality of liquid crystal molecules, scattering device are in this polymer materials, and wherein these a plurality of liquid crystal molecules are that the position is in the formed a plurality of liquid crystal balls of this polymer materials; And
A plurality of non-conductive particles, scattering device are in this polymer materials, in order to reduce the driving voltage of this polymer-dispersed liquid crystal.
5. polymer-dispersed liquid crystal constituent as claimed in claim 4, it is characterized in that, these a plurality of non-conductive particles shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 1% to 30%, this polymer materials shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 10% to 30%, and these a plurality of liquid crystal molecules shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 70% to 90%.
6. polymer-dispersed liquid crystal constituent as claimed in claim 4 is characterized in that, respectively a particle diameter of this non-conductive particle is to be situated between between 0.3 micron to 10 microns.
7. a manufacture method that is used in the polymer-dispersed liquid crystal constituent of the driving voltage that reduces polymer dispersion type liquid crystal display device is characterized in that, comprising:
One synthetics material and a plurality of liquid crystal molecule are provided, and wherein this synthetics material comprises a polyreaction material and a plurality of non-conductive particle;
Mix this synthetics material and these a plurality of liquid crystal molecules; And
Carry out an aggregation processing, with so that this polyreaction material aggregates into a polymer materials, and these a plurality of liquid crystal molecules and this a plurality of non-conductive particles are dispersed in this polymer materials, wherein these a plurality of liquid crystal molecules are that the position is in the formed a plurality of liquid crystal balls of this polymer materials.
8. the manufacture method that is used in the polymer-dispersed liquid crystal constituent of the driving voltage that reduces polymer dispersion type liquid crystal display device as claimed in claim 7, it is characterized in that these a plurality of non-conductive particles shared ratio in this synthetics material is to be situated between between 33% to 67%.
9. the manufacture method that is used in the polymer-dispersed liquid crystal constituent of the driving voltage that reduces polymer dispersion type liquid crystal display device as claimed in claim 7, it is characterized in that, these a plurality of non-conductive particles shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 1% to 30%, this polymer materials shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 10% to 30%, and these a plurality of liquid crystal molecules shared ratio in this polymer-dispersed liquid crystal constituent is to be situated between 70% to 90%.
10. the manufacture method that is used in the polymer-dispersed liquid crystal constituent of the driving voltage that reduces polymer dispersion type liquid crystal display device as claimed in claim 7 is characterized in that, respectively a particle diameter of this non-conductive particle is to be situated between between 0.3 micron to 10 microns.
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Cited By (1)
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| CN111766733A (en) * | 2020-07-31 | 2020-10-13 | 京东方科技集团股份有限公司 | Transparent display panel, preparation method thereof and display device |
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Application publication date: 20131023 |