CN117706816A - Light scattering device with polarization dependence characteristic, preparation method thereof and test equipment - Google Patents
Light scattering device with polarization dependence characteristic, preparation method thereof and test equipment Download PDFInfo
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- CN117706816A CN117706816A CN202311729626.1A CN202311729626A CN117706816A CN 117706816 A CN117706816 A CN 117706816A CN 202311729626 A CN202311729626 A CN 202311729626A CN 117706816 A CN117706816 A CN 117706816A
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- 230000010287 polarization Effects 0.000 title claims abstract description 51
- 238000000149 argon plasma sintering Methods 0.000 title claims abstract description 44
- 238000012360 testing method Methods 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 67
- 229920000642 polymer Polymers 0.000 claims abstract description 46
- 230000005684 electric field Effects 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 239000011521 glass Substances 0.000 claims abstract description 17
- 239000005264 High molar mass liquid crystal Substances 0.000 claims abstract description 15
- 239000000178 monomer Substances 0.000 claims abstract description 15
- 230000007704 transition Effects 0.000 claims abstract description 15
- 239000005639 Lauric acid Substances 0.000 claims abstract description 8
- -1 lauric acid acrylic ester Chemical class 0.000 claims abstract description 8
- POULHZVOKOAJMA-UHFFFAOYSA-N methyl undecanoic acid Natural products CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004642 Polyimide Substances 0.000 claims abstract description 5
- 229920001721 polyimide Polymers 0.000 claims abstract description 5
- 230000001419 dependent effect Effects 0.000 claims description 15
- 238000002834 transmittance Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 210000002858 crystal cell Anatomy 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 5
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 4
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 2
- 238000006116 polymerization reaction Methods 0.000 abstract description 5
- 239000003999 initiator Substances 0.000 abstract description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 abstract 1
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 description 3
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- RDHSUTIDSFVNJL-UHFFFAOYSA-N OC(=O)C=C.CCCCCCCCCCCC(O)=O Chemical group OC(=O)C=C.CCCCCCCCCCCC(O)=O RDHSUTIDSFVNJL-UHFFFAOYSA-N 0.000 description 1
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
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Abstract
The invention relates TO a light scattering device with polarization dependence characteristic and a preparation method and test equipment thereof, wherein the device comprises a parallel orientation liquid crystal box, the parallel orientation liquid crystal box comprises an upper glass substrate and a lower glass substrate which are plated with an ITO conductive layer, the surface of the ITO conductive layer is coated with a polyimide orientation layer with parallel friction, and a polymer-liquid crystal mixed system filled between the substrates, the polymer-liquid crystal mixed system comprises a photo-polymerization monomer which can polymerize along the light direction, a prepolymer CN131 and a photo-initiator, and the photo-polymerization monomer is lauric acid acrylic ester (LA); the content of the polymer in the polymer-liquid crystal mixed system is 30% -40%; the device can realize the transition from a scattering state to a transparent state under the action of an electric field. After the liquid crystal polymer of the device is polymerized in a simple mode, the light scattering device with polarization dependence characteristic is obtained, the transition between a transparent state and a scattering state is realized by applying voltage, and the prepared device has lower driving voltage and quicker response time.
Description
Technical Field
The invention relates to the technical field of polymer-liquid crystal composite materials and optical display technology, in particular to a light scattering device with polarization dependence characteristics, a preparation method thereof and test equipment thereof.
Background
For polymer-liquid crystal composite systems, it is known that a photopolymerizable monomer or prepolymer is polymerized and then coexisted with a small molecular liquid crystal. In the case of different polymer contents, the liquid crystal may be dispersed droplets or connected domains. For PDLC prepared by positive liquid crystal, when no external electric field is applied, incident light is strongly scattered due to mismatching of optical refractive indexes of liquid crystal and polymer, and macroscopic appearance is milky; after the liquid crystal molecules are electrified, the liquid crystal molecules are arranged along the direction of an electric field, light rays are not scattered any more, and the liquid crystal molecules macroscopically present a transparent state. On the other hand, the polarizing plate is an optical device that selectively transmits light rays of different polarization directions, and is widely used in display, photographic equipment, goggles, and other fields. With the advanced development of optical devices and components, polarizers have become one of the most basic and important optical components. The traditional optical polaroid is mainly realized by utilizing the absorption effect of materials such as dye and the like, and the integral light transmittance can not exceed 50% in theory. In recent years, a scattering type polaroid for realizing polarization direction selection by using scattering effect has been attracting attention because of higher overall transmittance, and the scattering type polaroid uses an optical anisotropic material to have different refractive indexes for light rays with different polarization directions, so that the refractive indexes between disperse phases fluctuate, and further, selective scattering of the light rays with different polarization directions is realized.
Disclosure of Invention
The invention provides a light scattering device with polarization dependence characteristics, a preparation method and test equipment thereof, wherein the device realizes different degrees of scattering of light with different polarization directions by configuring a polymer and liquid crystal mixture in proper proportion and polymerizing. In order to achieve the above purpose, the specific technical scheme is as follows:
in one aspect, a light scattering device with polarization dependence characteristics is provided, including a parallel alignment liquid crystal cell, the parallel alignment liquid crystal cell includes an upper glass substrate and a lower glass substrate coated with an ITO conductive layer, the surface of the ITO conductive layer is coated with a polyimide alignment layer with parallel rubbing, and a polymer-liquid crystal mixed system filled between the substrates, the polymer-liquid crystal mixed system includes a photo-polymerization monomer, a prepolymer CN131 and a photo-initiator, and the photo-polymerization monomer is lauric acid acrylate (LA); the content of the polymer in the polymer-liquid crystal mixed system is 30% -40%; the device can realize the transition from a scattering state to a transparent state under the action of an electric field.
As a preferable technical scheme, the mass ratio of the photopolymerization monomer to the prepolymer CN131 is 1:1.
Preferably, the driving voltage of the electric field is 1 to 3V.
As a preferable technical scheme, the device is driven by square-wave alternating current with the frequency of 50-200 Hz.
As a preferred embodiment, the liquid crystal is a positive nematic liquid crystal.
As a preferable technical scheme, the device further comprises a frame sealing glue used for sealing the liquid crystal box, wherein resin spacer beads are mixed in the frame sealing glue, the diameter of each bead is 4 microns, and the frame sealing glue is used for keeping the thickness of the liquid crystal box parallel.
In another aspect, a method for manufacturing the light scattering device with polarization dependence is provided, including:
mixing a prepolymer CN131 and lauric acid acrylic ester (LA) according to a mass part of 1:1, and adding 3% of a photoinitiator to prepare a polymer solution;
vortex the polymer solution for at least 5 minutes to disperse uniformly;
mixing the oscillated polymer solution with liquid crystal E7 according to the proportion of 3:7-4:6, and carrying out vortex oscillation for 5 minutes to obtain a polymer-liquid crystal mixed system;
pouring the polymer-liquid crystal mixed system into a liquid crystal box under the heating condition by utilizing capillary action;
and (5) exposing the liquid crystal box under an ultraviolet light source, and sealing the frame to obtain the device.
As a preferable technical scheme, the ultraviolet light source is ultraviolet light which is incident in a collimation vertical plane. The polymer systems used in the present invention can be made to tend to grow perpendicular to the glass plane, ultimately resulting in a much greater vertical distribution of polymer than lateral distribution of polymer, thereby forming liquid crystal domains extending up and down. It is due to the presence of such liquid crystal domains that the rubbing orientation of the glass substrate can play a role.
As a preferable technical scheme, the light intensity of the ultraviolet light source used for exposure is 10mW/cm 2 The exposure time is 3-5 minutes.
In a third aspect, an optical apparatus for testing the above device is also provided, comprising: helium-neon laser, attenuator, polaroid, sample stage, photoelectric detector, oscilloscope, amplifier and recorder; wherein the distance between the sample stage and the photoelectric detector is 10-15 cm, and the receiving area of the photoelectric detector is about 1cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The rotating polarizer can obtain polarized light with the polarization direction parallel to the rubbing direction and polarized light perpendicular to the rubbing direction, and is used for measuring the transmittance of the device to light rays with different polarization directions.
Compared with the prior art, the invention has the following technical effects: after the device is polymerized in a simple way, the light scattering device with polarization dependence characteristic is obtained. The device can realize the conversion between a scattering state and a transparent state by applying voltage, and two linearly polarized lights with mutually perpendicular polarization directions have different scattering intensities in the scattering state, which are reflected in different transmittances. Through test equipment detection, the device can be driven only by a lower driving voltage, and the response time is also faster.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Description of the drawings:
FIG. 1 is a schematic diagram showing the operation of a light scattering device having polarization dependent characteristics according to embodiment 1 of the present invention;
FIG. 2 is a microscopic schematic diagram of a light scattering device with polarization dependent characteristics according to embodiment 1 of the present invention;
FIG. 3 is a flow chart showing a method for fabricating a light scattering device having polarization dependent characteristics according to embodiment 2 of the present invention;
FIG. 4 is a schematic diagram of the structure of an optical device for testing the electro-optic curves of a device according to embodiment 5 of the present invention;
FIG. 5 is an electro-optic plot of light scattering devices with polarization dependent characteristics versus light of different polarization directions as proposed in example 5 of the present invention;
fig. 6 is a schematic representation of a light scattering device with polarization dependent properties in a polarized light background.
Reference numerals illustrate:
a parallel alignment liquid crystal cell 1; an upper glass substrate 11; a lower glass substrate 12; a polyimide alignment layer 13; a polymer 14; a liquid crystal 15;
helium-neon laser 21, attenuator 22, polarizer 23, sample and sample stage 24, photodetector 25, oscilloscope 26, amplifier 27, recorder 28.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
It should be understood that the various steps recited in the method embodiments of the present application may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present application is not limited in this respect.
The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments. Related definitions of other terms will be given in the description below.
It should be noted that references to "one" or "a plurality" in this application are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be interpreted as "one or more" unless the context clearly indicates otherwise. "plurality" is understood to mean two or more.
Example 1
As shown in fig. 1, a light scattering device with polarization dependent characteristics, i.e., a scattering type polarizer, is proposed for the present embodiment. When the polarization direction of incident light is perpendicular to the rubbing direction of the alignment layer, the polarization direction of the light is perpendicular to the long axis of the molecules of the liquid crystal 15, the effective refractive index of the liquid crystal 15 area is not greatly different from that of the isotropic polymer 14, the light scattering is weak, and most of light normally passes through. When the polarization direction of the incident light is parallel to the rubbing direction of the alignment layer, the polarization direction of the light is parallel to the long axis of the molecules of the liquid crystal 15, the effective refractive index of the liquid crystal 15 area is greatly different from that of the polymer 14, and the incident light is strongly scattered.
As shown in fig. 2, the device comprises a parallel alignment liquid crystal cell 1, wherein the parallel alignment liquid crystal cell 1 comprises an upper glass substrate 11 and a lower glass substrate 12 coated with an ITO conductive layer, a polyimide alignment layer 13 coated on the surface of the ITO conductive layer for parallel rubbing, and a polymer 14-liquid crystal 15 mixed system filled between the substrates. The polymer 14-liquid crystal 15 mixed system comprises a photopolymerization monomer which is easy to polymerize along the light direction, a prepolymer CN131 and a photoinitiator, wherein the photopolymerization monomer is lauric acid acrylic ester (LA); the content of the polymer 14 in the polymer 14-liquid crystal 15 mixed system is 30% -40%; the device can realize the transition from a scattering state to a transparent state under the action of an electric field. As can be seen from fig. 1, the polymers 14 penetrate the liquid crystal 15 cell up and down, and the liquid crystal 15 molecules are horizontally aligned and interpenetrated between the polymers 14 by the alignment layer.
Further, the device also comprises a power supply component, and the conductive ITO coatings of the upper glass substrate 11 and the lower glass substrate 12 are respectively connected with two poles of the power supply component.
Preferably, the mass ratio of the photopolymerizable monomer to the prepolymer CN131 is set to 1:1. It will be appreciated by those skilled in the art that the pure monofunctional photopolymerizable monomer is difficult to polymerize and thus the introduction of prepolymer CN131 allows good curing of the polymer 14 system. In addition, the CN131 with high refractive index plays a role of balancing refractive index to ensure that the on-state transmittance of the device is higher. The specific proportion can be properly adjusted on the basis of the proportion, and the polymerization characteristic of the photopolymerization monomer under ultraviolet light can be maintained on the premise of ensuring good curing of the polymer 14 system.
Preferably, the driving voltage of the device connected with the electric field is 1-3V. The light scattering device with the dependency on polarized light can realize the transition from a scattering state to a transparent state under the action of an electric field, has lower driving voltage, has a threshold voltage of about 1V and a saturation voltage of about 3V.
Preferably, the device is driven by square wave alternating current at a frequency of 50-200 Hz.
Preferably, the liquid crystal 15 is a positive nematic liquid crystal 15.
Preferably, the device further comprises a sealant for sealing the liquid crystal 15 cell, wherein resin spacer beads with a diameter of 4 μm are mixed in the sealant for maintaining the thickness of the liquid crystal 15 cell in parallel.
Example 2
As shown in fig. 3, the preparation method for preparing the light scattering device with polarization dependence characteristic according to the present embodiment specifically includes the following steps:
s10, mixing prepolymer CN131 and lauric acid acrylic ester (LA) according to the ratio of 1:1, and adding 3% of photoinitiator 184 (1-hydroxy-cyclohexyl-phenyl ketone) to prepare a polymer 14 solution.
And S20, vortex and shake the polymer 14 solution for at least 5 minutes to uniformly disperse.
And S30, mixing the oscillated polymer 14 solution with liquid crystal 15E7 according to the proportion of 3:7, and carrying out vortex oscillation for 5 minutes to obtain a polymer 14-liquid crystal 15 mixed system.
And S40, pouring the polymer 14-liquid crystal 15 mixed system into a liquid crystal 15 box under the heating condition by utilizing capillary action. The heating temperature is generally about 50 ℃.
And S50, exposing the liquid crystal 15 box under an ultraviolet light source, and sealing the frame to obtain the final device. Further preferably, the ultraviolet light source is collimated homeotropic incident ultraviolet light. The light intensity of the ultraviolet light source used for exposure was 10mW/cm 2 The exposure time was 3 minutes. Ultraviolet light can cause the polymer 14 system used in the present invention to tend to grow perpendicular to the glass plane, ultimately resulting in far more vertically distributed polymer 14 than laterally distributed polymer 14, thereby forming domains of liquid crystal 15 extending above and below. It is due to the presence of such domains of liquid crystal 15 that the rubbing alignment of the glass substrate can play a role.
When voltage is applied to the light scattering device with polarization dependence characteristics, the light scattering device can realize the transition from a scattering state to a transparent state under the action of an electric field, and the light scattering device can realize the transition from the scattering state to the transparent state only by a lower driving voltage (1-3V). Meanwhile, the light scattering device with the dependency on polarized light can realize quick response under the action of an electric field, when the driving voltage is 5V, the conversion time from a scattering state to a transparent state is about 30ms, and when the switch is closed, the driving voltage is removed, and the conversion time from the transparent state to the scattering state of the device is about 244ms. And the device presents different scattering states for polarized light in different directions in the scattering state, i.e. when no voltage is applied.
Example 3
With continued reference to fig. 3, a light scattering device having polarization dependent characteristics was prepared:
s10, mixing prepolymer CN131 and lauric acid acrylic ester (LA) according to the ratio of 1:1, and adding 3% of photoinitiator 184 (1-hydroxy-cyclohexyl-phenyl ketone) to prepare a polymer 14 solution.
And S20, vortex and shake the polymer 14 solution for at least 5 minutes to uniformly disperse.
And S30, mixing the oscillated polymer 14 solution with liquid crystal 15E7 according to the ratio of 4:6, and carrying out vortex oscillation for 5 minutes to obtain a polymer 14-liquid crystal 15 mixed system.
And S40, pouring the polymer 14-liquid crystal 15 mixed system into a liquid crystal 15 box under the heating condition by utilizing capillary action. The heating temperature is generally about 50 ℃.
And S50, exposing the liquid crystal 15 box under an ultraviolet light source, and sealing the frame to obtain the final device. Further preferably, the ultraviolet light source is collimated homeotropic incident ultraviolet light. The light intensity of the ultraviolet light source used for exposure was 10mW/cm 2 The exposure time was 5 minutes.
When voltage is applied to the light scattering device with polarization dependence characteristics, the light scattering device can realize the transition from a scattering state to a transparent state under the action of an electric field, and the light scattering device can realize the transition from the scattering state to the transparent state only by a lower driving voltage (1-3V). Meanwhile, the light scattering device with the dependency on polarized light can realize quick response under the action of an electric field, when the driving voltage is 5V, the conversion time from a scattering state to a transparent state is about 30ms, and when a power switch is closed, the conversion time from the transparent state to the scattering state of the device is about 244ms. And the device presents different scattering states for polarized light in different directions in the scattering state, i.e. when no voltage is applied.
Example 4
With continued reference to fig. 3, a light scattering device having polarization dependent characteristics was prepared:
s10, mixing prepolymer CN131 and lauric acid acrylic ester (LA) according to the ratio of 1:1, and adding 3% of photoinitiator 184 (1-hydroxy-cyclohexyl-phenyl ketone) to prepare a polymer 14 solution.
And S20, vortex and shake the polymer 14 solution for at least 5 minutes to uniformly disperse.
And S30, mixing the oscillated polymer 14 solution with liquid crystal 15E7 according to the proportion of 7:13, and carrying out vortex oscillation for 5 minutes to obtain a polymer 14-liquid crystal 15 mixed system.
And S40, pouring the polymer 14-liquid crystal 15 mixed system into a liquid crystal 15 box under the heating condition by utilizing capillary action. The heating temperature is generally about 50 ℃.
And S50, exposing the liquid crystal 15 box to an ultraviolet light source to obtain a final device. Further preferably, the ultraviolet light source is collimated homeotropic incident ultraviolet light. The light intensity of the ultraviolet light source used for exposure was 10mW/cm 2 The exposure time was 4 minutes.
When voltage is applied to the light scattering device with polarization dependence characteristics, the light scattering device can realize the transition from a scattering state to a transparent state under the action of an electric field, and the light scattering device can realize the transition from the scattering state to the transparent state only by a lower driving voltage (1-3V). Meanwhile, the light scattering device with the dependency on polarized light can realize quick response under the action of an electric field, when the driving voltage is 5V, the conversion time from a scattering state to a transparent state is about 30ms, and when a power switch is closed, the conversion time from the transparent state to the scattering state of the device is about 244ms. And the device presents different scattering states for polarized light in different directions in the scattering state, i.e. when no voltage is applied.
Example 5
Referring to fig. 4, an optical apparatus for testing an electro-optic curve of a device according to the present embodiment includes: helium-neon laser 21, attenuator 22, polarizer 23, sample and sample stage 24, photodetector 25, oscilloscope 26, amplifier 27, recorder 28. Wherein the distance between the sample and the sample stage 24 and the photodetector 25 is 10-15 cm, and the receiving area of the photodetector 25 is about 1cm 2 . The device to be tested is placed on the sample stage, and the rotating polaroid 23 can obtain polarized light with the polarization direction parallel to the friction direction and polarized light perpendicular to the friction direction, so that the device is used for measuring the transmittance of the device to light rays with different polarization directions.
Referring to FIG. 5, a graph of the transmittance of the present sample versus voltage for two polarized light under a 1kHz cross-linked electrical drive is shown. The abscissa is voltage and the ordinate is actual transmittance. The test was performed once every 0.5V, and an electro-optic curve was drawn. Under the drive of voltage, the two polarized lights realize the transition from a scattering state to a transparent state, and the maximum transmittance is approximately 80 percent. The transmittance of polarized light 1 at 0V is less than 10% and the transmittance of polarized light 2 is more than 40% and the polarized light 1 is in a weak scattering state. The different degree of scattering of the two polarized light at 0V is a source of selectivity for light of different polarization directions for the present sample as a light scattering device with polarization dependent properties.
The light scattering device with the dependency on polarized light can realize the transition from a scattering state to a transparent state under the action of an electric field, and can realize the transition from the scattering state to the transparent state only by a lower driving voltage. As can be seen from fig. 5, the threshold voltage is about 1V, that is, the drive voltage is about 1V, the transmittance gradually increases, and when the threshold voltage reaches about 3V, the transmittance gradually becomes gentle, that is, the saturation voltage is about 3V.
The light scattering device with the dependency on polarized light can realize quick response under the action of an electric field, when the driving voltage is 5V, the conversion time from a scattering state to a transparent state is about 30ms, and when a power switch is closed, the conversion time from the transparent state to the scattering state of the device is about 244ms.
Referring to fig. 6, a sample of the device is a physical diagram when placed in different directions under a linear polarized background light source. The background is color characters displayed by a liquid crystal display screen, and the light emitted by the liquid crystal display screen is linearly polarized light. When the light scattering device with polarization dependence characteristics prepared by the invention is used for observing the background, when the polarization direction of screen light is perpendicular to the rubbing direction of the product, the light is strongly scattered, background characters cannot be seen, and when the polarization direction of the screen light is parallel to the rubbing direction of the product, the light scattering degree is very light, so that the background characters can be clearly seen.
According to the technical scheme, the positive nematic liquid crystal 15 is mixed with a polymer 14 system containing a photopolymerized monomer growing along the light direction, and light rays with different polarization directions can be selectively scattered after the steps of oscillation, pouring, exposure and the like.
Meanwhile, the sample has the characteristics of low driving voltage and quick response, and the reason is that: the polymer 14 system with lower content leads to small specific surface area of the domains of the liquid crystal 15, and the liquid crystal 15 has smaller anchoring capability, so that the liquid crystal 15 only needs to overcome smaller resistance when moving under an electric field. The voltage required for the movement of the liquid crystal 15 is low and the response time is short.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (10)
1. The light scattering device with polarization dependence characteristics is characterized by comprising a parallel orientation liquid crystal box, wherein the parallel orientation liquid crystal box comprises an upper glass substrate and a lower glass substrate which are plated with ITO conductive layers, the surfaces of the ITO conductive layers are coated with polyimide orientation layers with parallel friction, and a polymer-liquid crystal mixed system filled between the glass substrates, the polymer-liquid crystal mixed system comprises a photopolymerization monomer, a prepolymer CN131 and a photoinitiator, and the photopolymerization monomer is lauric acid acrylic ester; the content of the polymer in the polymer-liquid crystal mixed system is 30% -40%; the device can realize the transition from a scattering state to a transparent state under the action of an electric field.
2. The light-scattering device with polarization-dependent properties of claim 1, wherein the mass ratio of the photopolymerizable monomer to the prepolymer CN131 is 1:1.
3. A light scattering device with polarization dependent properties as claimed in claim 1, characterized in that the driving voltage of the electric field is 1-3V.
4. A light scattering device with polarization dependent properties according to claim 3, characterized in that the device is driven by square wave alternating current with a frequency of 50-200 Hz.
5. A light scattering device with polarization dependent properties according to claim 1, characterized in that the liquid crystal is a positive nematic liquid crystal.
6. A light scattering device with polarization dependent properties according to claim 1, further comprising a frame sealing compound for sealing the liquid crystal cell, the frame sealing compound having resin spacer beads mixed therein, the beads having a diameter of 4 μm for maintaining the thickness of the parallel liquid crystal cell.
7. A method of making a light scattering device having polarization dependent characteristics as claimed in any one of claims 1 to 6, comprising:
mixing a prepolymer CN131 and lauric acid acrylic ester according to a ratio of 1:1, and adding 3% of a photoinitiator to prepare a polymer solution;
vortex shaking the polymer solution for at least 5 minutes to uniformly disperse;
mixing the oscillated polymer solution with liquid crystal E7 according to the proportion of 3:7-4:6, and carrying out vortex oscillation for 5 minutes to obtain a polymer-liquid crystal mixed system;
pouring the polymer-liquid crystal mixed system into a liquid crystal box under the heating condition by utilizing capillary action;
and exposing the liquid crystal box under an ultraviolet light source, and sealing the frame to obtain the device.
8. The method of claim 7, wherein the ultraviolet light source is ultraviolet light incident on a collimation homeotropic surface.
9. The method of claim 7, wherein the ultraviolet light source has an intensity of 10mW/cm 2 The exposure time is 3-5 minutes.
10. An optical apparatus for testing the device manufactured by the method of any one of claims 7-9, comprising: helium-neon laser, attenuator, polaroid, sample stage, photoelectric detector, oscilloscope, amplifier and recorder; wherein the distance between the sample stage and the photoelectric detector is 10-15 cm, and the receiving area of the photoelectric detector is about 1cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The polarizing plate is rotated to obtain polarized light with a polarization direction parallel to the rubbing direction and polarized light perpendicular to the rubbing direction, and the polarized light is used for measuring the transmittance of the device to light rays with different polarization directions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311729626.1A CN117706816A (en) | 2023-12-15 | 2023-12-15 | Light scattering device with polarization dependence characteristic, preparation method thereof and test equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311729626.1A CN117706816A (en) | 2023-12-15 | 2023-12-15 | Light scattering device with polarization dependence characteristic, preparation method thereof and test equipment |
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| CN202311729626.1A Pending CN117706816A (en) | 2023-12-15 | 2023-12-15 | Light scattering device with polarization dependence characteristic, preparation method thereof and test equipment |
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