CN211236504U - Liquid crystal light modulation device - Google Patents
Liquid crystal light modulation device Download PDFInfo
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- CN211236504U CN211236504U CN201922029185.XU CN201922029185U CN211236504U CN 211236504 U CN211236504 U CN 211236504U CN 201922029185 U CN201922029185 U CN 201922029185U CN 211236504 U CN211236504 U CN 211236504U
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Abstract
The utility model discloses a liquid crystal light modulation device, which comprises a first light transmission conductive substrate and a second light transmission conductive substrate which are arranged oppositely, wherein, the opposite surfaces of the first light transmission conductive substrate and the second light transmission conductive substrate are provided with vertical orientation layers; the surfaces, attached to the vertical orientation layers, of the first light-transmitting conductive substrate and/or the second light-transmitting conductive substrate are provided with relief structures; an adjusting area is arranged between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, and negative liquid crystal is filled in the adjusting area. In this way, the utility model discloses liquid crystal light modulation device accessible voltage modulation realizes light control, its simple structure, low in production cost, and the long service life of device.
Description
Technical Field
The utility model belongs to the technical field of the liquid crystal display technique and specifically relates to a liquid crystal light-adjusting device is related to.
Background
At present, intelligent liquid crystal dimming glass is widely applied to indoor space partitions, bathroom partitions, toilet partitions, projection screens and the like. The existing intelligent liquid crystal dimming glass is mostly based on a polymer network system, mainly comprises a Polymer Dispersed Liquid Crystal (PDLC) or Polymer Stabilized Liquid Crystal (PSLC) system, the turning of liquid crystal molecules is adjusted by powering on and powering off, and then the transmission, reflection and scattering of light are adjusted, the conversion of a fuzzy state and a light-transmitting state is realized, however, no matter whether the PDLC or the PSLC contains a polymer network, a polymer material is required to be used, because the price of the polymer material is higher, the price of the liquid crystal dimming glass is always high, the price of the liquid crystal dimming glass is thousands of RMB per square meter, and meanwhile, because of the existence of processes such as polymerization reaction, the preparation process consumes long time, and the aging phenomenon of organic polymers is accompanied, and the service life of the dimming glass is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a liquid crystal light modulation device, this liquid crystal light modulation device accessible voltage modulation realizes light modulation, and is with low costs, long service life.
The utility model adopts the technical proposal that:
the utility model discloses a first aspect provides a liquid crystal light-adjusting device, include: the light-transmitting substrate comprises a first light-transmitting conductive substrate and a second light-transmitting conductive substrate which are arranged oppositely, wherein vertical orientation layers are arranged on opposite surfaces of the first light-transmitting conductive substrate and the second light-transmitting conductive substrate; the surfaces, attached to the vertical alignment layers, of the first light-transmitting conductive substrate and/or the second light-transmitting conductive substrate are provided with relief structures; an adjusting area is arranged between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, and negative liquid crystal is filled in the adjusting area.
According to some embodiments of the present invention, the first light-transmitting conductive substrate and the second light-transmitting conductive substrate have relief structures on the surface thereof to which the vertical alignment layer is attached.
According to some embodiments of the invention, the first light-transmissive electrically conductive substrate and the second light-transmissive electrically conductive substrate have the same relief structure on the surface.
According to some embodiments of the invention, the period of the relief features is between 0.5 μm and 50 μm and the height is between 100nm and 2000 nm.
According to some embodiments of the invention, the relief structure is wave-shaped, lattice-shaped or checkerboard-shaped.
According to some embodiments of the present invention, the height of the adjustment zone is 3um to 50 um.
According to some embodiments of the present invention, the adjustment area is further provided with a spacer for supporting the interval the first light-transmitting conductive substrate and the second light-transmitting conductive substrate.
According to some embodiments of the present invention, the first light-transmitting conductive substrate and/or the second light-transmitting conductive substrate includes a light-transmitting substrate, a conductive layer, and a relief pattern structure layer stacked in sequence.
According to some embodiments of the invention, the first light-transmissive conductive substrate and/or the second light-transmissive conductive substrate comprises a light-transmissive substrate and a conductive layer stacked in sequence; the surface of the conducting layer is of a relief structure.
According to some embodiments of the utility model, still include power supply module, power supply module's the two poles of the earth respectively with first printing opacity conductive substrate with second printing opacity conductive substrate electric connection.
In addition, the negative liquid crystal can specifically adopt negative liquid crystal HNG 30400-200; the vertical alignment layer is made of polyimide; the conductive layer may be an ITO conductive layer.
The above liquid crystal dimming device can be manufactured by a method comprising the steps of:
s1, preparing a first light-transmissive conductive substrate, including: preparing a first conductive layer on the surface of a first light-transmitting substrate; then preparing a relief structure layer on the surface of the first conducting layer, which is far away from the first light-transmitting substrate, so as to form a first light-transmitting conducting substrate with a relief structure on the surface;
s2, taking or preparing a second light-transmitting conductive substrate;
s3, arranging a first vertical orientation layer on the surface of the relief structure layer on the first light-transmitting conductive substrate; and disposing a second vertical alignment layer on the second light-transmitting conductive substrate;
s4, oppositely arranging the surface of the first light-transmitting conductive substrate, on which the first vertical alignment layer is arranged, and the surface of the second light-transmitting conductive substrate, on which the second vertical alignment layer is arranged, and preparing a liquid crystal box;
and S5, filling negative liquid crystal into the liquid crystal box, and forming a regulating region between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate.
In step S1, the relief structure layer is disposed on the surface of the first conductive layer away from the first transparent substrate, which may be implemented by the following method:
a. arranging a resin polymer layer on the surface of the first conducting layer, which is far away from the first light-transmitting substrate; the raw materials of the resin polymer layer comprise a base material polymer, a monomer and a photoinitiator, wherein the monomer can be a photo-polymerization monomer or a crosslinking monomer; the base material polymer can be at least one of polymethyl methacrylate (PMMA) and Poly Benzyl Methacrylate (PBMA); the monomer can be multifunctional acrylate; the preparation method specifically comprises the following steps of mixing the raw materials of the resin polymer layer with a proper amount of solvent to form a polyester resin solution, wherein the mass ratio of the base material polymer, the monomer, the photoinitiator and the solvent is (5-10): (5-10): (1-3): (20-30);
b. and arranging a photoetching plate with a specific pattern on the resin polymer layer, and carrying out exposure and curing to form a relief structure layer. The pattern pitch of the reticle is generally 2um to 30 um. The exposure process can specifically select the exposure dose as 100-2The height of the finally formed relief structure layer is generally 100nm to 2000 nm.
The relief structure layer is mainly characterized in that a resin polymer layer is subjected to photopolymerization or photocrosslinking reaction, namely, the resin polymer layer is exposed by contacting a photoetching plate, and a polymerizable monomer or a crosslinking monomer is polymerized with free radicals of an activated photoinitiator, so that a relief structure is generated, and the formed relief structure is stable.
In step S2, the preparing the second light-transmitting conductive substrate may specifically include: preparing a second conductive layer on the surface of the second light-transmitting substrate; then preparing a relief structure layer on the surface of the second conducting layer, which is far away from the second light-transmitting substrate, so as to form a second light-transmitting conducting substrate with a relief structure on the surface;
correspondingly, in step S3, the step of disposing the second vertical alignment layer on the second light-transmitting conductive substrate is specifically: and arranging a second vertical orientation layer on the surface of the relief structure layer on the second light-transmitting conductive substrate.
The embodiment of the utility model provides a beneficial effect is:
the embodiment of the utility model provides a liquid crystal dimming device, including relative first printing opacity conducting substrate and the second printing opacity conducting substrate that sets up, all be equipped with the vertical orientation layer on the opposite face of first printing opacity conducting substrate and second printing opacity conducting substrate; the surfaces, attached to the vertical orientation layers, of the first light-transmitting conductive substrate and/or the second light-transmitting conductive substrate are provided with relief structures; an adjusting area is arranged between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, and negative liquid crystal is filled in the adjusting area. By the above mode, the regulating region is filled with negative liquid crystal without containing a polymer network, so that the problems that the aging of an organic polymer is aggravated and the service life of a dimming device is shortened due to the fact that a polymer network system is continuously converted and stretched in the power-on and power-off processes of the device can be solved; the method can reduce production time and production cost, and the service life of the device is long. When the liquid crystal dimming device is in a non-electrified state, the negative liquid crystals are arranged in a single domain vertical to the light-transmitting conductive substrate under the induction of the vertical orientation layer, and visible light can penetrate through the first light-transmitting conductive substrate and the second light-transmitting conductive substrate and is in a light-transmitting state; if voltage is applied between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, the negative liquid crystal can be turned to the direction vertical to the electric field under the action of the electric field, and the surface of the first light-transmitting conductive substrate and/or the second light-transmitting conductive substrate is provided with the relief structure, so that the negative liquid crystal is turned to be in multi-domain arrangement parallel to the light-transmitting conductive substrate, light scattering is enhanced, the liquid crystal light adjusting device can be turned to be in a light scattering state from a light transmission state, and light adjustment can be achieved through voltage modulation.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 is a schematic view showing a process for producing a liquid crystal dimmer device according to example 1;
FIG. 2 is a schematic structural diagram of a stripe reticle used in a process of manufacturing a liquid crystal dimmer device according to example 1;
FIG. 3 is a schematic structural diagram of a relief structure layer obtained in example 1;
FIG. 4 is a schematic structural view of a liquid crystal dimmer device of embodiment 1 in a non-energized state;
fig. 5 is a schematic structural view of a liquid crystal dimming device in an energized state according to embodiment 1;
FIG. 6 is a schematic diagram showing a structure of a grating photomask used in a process of manufacturing a liquid crystal dimmer device according to example 2;
FIG. 7 is a schematic structural diagram of a checkerboard reticle employed in a fabrication process of a liquid crystal dimmer device according to example 3;
fig. 8 is a graph showing a change of light transmittance with voltage during power-on of the liquid crystal dimming devices manufactured in example 1 and comparative example 1.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, a method for manufacturing a liquid crystal light modulation device includes the following steps:
s1, preparing a resin composition solution, including: taking a polymer polymethyl methacrylate, a dipentaerythritol pentaacrylate monomer, a photoinitiator Irgacure 819 and a solvent propylene glycol monomethyl ether acetate according to a mass ratio of 10:10:1:30, mixing the raw materials, heating to 100 ℃, and stirring for 30min to dissolve the monomer and the polymer to form a resin polymer solution.
S2, as shown in fig. 1 (a), cutting to prepare a transparent substrate 11, where the transparent substrate 11 may specifically be a substrate made of a glass material, and then preparing a conductive layer 12 on the transparent substrate 11, where the conductive layer 12 may be an ITO electrode film layer; then spin-coating a layer of the resin polymer solution prepared in the step S1 on the surface of the conductive layer 12 away from the light-transmitting conductive substrate 11, wherein the spin-coating speed is 800 rpm/min; drying the sample at 80 ℃ for 10min to remove the solvent, and then cooling to room temperature to form a resin polymer film layer 13' on the conductive layer 12; then as shown in fig. 1 (b), a stripe reticle 14 having a pitch of 5 μm is disposed on the resin polymer thin film layer 13 ', as shown in fig. 2, the stripe reticle 14 includes a light-transmitting portion 141 and a light-blocking portion 142 to cover and shield the resin polymer thin film layer 13' according to a structural pattern of the stripe reticle 14, and the sample is exposed to a calibrated UV (ultraviolet) light source at an exposure dose of 625mJ/cm2(ii) a The samples were then streaked at 120 ℃Heating for 10 min; thereby creating a surface relief topography, as shown in fig. 1 (c); as shown in fig. 1 (d), the sample is fixed by performing the overall exposure at 110 ℃ using UV light, and a first light-transmitting conductive substrate having a relief structure layer 13 (shown in fig. 3) on the surface is obtained.
And S3, preparing a second light-transmitting conductive substrate with a relief structure layer on the surface according to the same operation method as the step S2, wherein the relief structure layer on the surfaces of the first light-transmitting conductive substrate and the second light-transmitting conductive substrate can be the same in shape or different in shape.
S4, preparing vertical alignment layers on the surfaces of the relief structure layers on the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, wherein the vertical alignment layers can be made of polyimide. Then, arranging a packaging frame through UV curing adhesive and a 10-micrometer gap, and packaging to obtain a liquid crystal box;
s5, filling negative liquid crystal HNG30400-200 (purchased to Jiangsu and Chengshi display science and technology Co., Ltd.) into a liquid crystal box on a heating table at 100 ℃ by virtue of capillary force, and preserving heat for 30min to ensure that the negative liquid crystal can be well oriented, thereby preparing the liquid crystal dimming device.
The specific structure of the liquid crystal dimming device manufactured above is shown in fig. 4, and includes a first transparent conductive substrate and a second transparent conductive substrate which are oppositely arranged, the first transparent conductive substrate includes a first transparent substrate 11 and a first conductive layer 12 which are sequentially stacked, and a first relief structure layer 13 is arranged on the surface of the first conductive layer 12 which is far away from the first transparent substrate 11; the second light-transmitting conductive substrate comprises a second light-transmitting substrate 21 and a second conductive layer 22 which are sequentially stacked, and a second relief structure layer 23 is arranged on the surface, deviating from the second light-transmitting substrate 21, of the second conductive layer 22; the surface of the first undulation morphology structure layer 13 is provided with a first vertical orientation layer 14, and the surface of the second undulation morphology structure layer 23 is provided with a second vertical orientation layer 24; the first and second vertical alignment layers 14 and 24 are oppositely disposed; a packaging rubber frame 3 is arranged between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, the packaging rubber frame 3 packages the space between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate to form an adjusting area 4, and negative liquid crystals 5 are filled in the adjusting area 4. In this embodiment, the first relief structure layer 13 and the second relief structure layer 23 are both undulating.
In the above liquid crystal dimming device, in a non-energized state, the negative liquid crystal 5 is aligned perpendicular to the first light-transmitting conductive substrate and the second light-transmitting conductive substrate under the induction of the first vertical alignment layer 14 and the second vertical alignment layer 24, and visible light can be transmitted through the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, so that the liquid crystal dimming device is in a light-transmitting state.
The liquid crystal light adjusting device can be used for light adjustment, and the specific method comprises the following steps: referring to fig. 5, a power supply module is connected between the first conductive layer 12 and the second conductive layer 22 of the liquid crystal dimming device, the power supply module specifically adopts an ac power supply, a voltage adjusting device is integrated on the ac power supply, the power supply voltage can be directly adjusted, and two poles of the power supply module are respectively electrically connected with the first conductive layer 12 and the second conductive layer 22; a voltage is applied between the first conductive layer 12 and the second conductive layer 22 through a power supply component, and the negative liquid crystal 5 can be turned to the direction vertical to the electric field from the orientation arrangement vertical to the light-transmitting conductive substrate in the non-energized state under the action of the electric field because the dielectric constant of the negative liquid crystal 5 in the molecular long axis direction is smaller than that in the molecular short axis direction; because the first relief structure layer 13 is arranged on the surface of the first conductive layer 12 and the second relief structure layer 23 is arranged on the surface of the second conductive layer 22, the negative liquid crystal 5 is in multi-domain arrangement parallel to the transparent conductive substrate after turning, light scattering is enhanced, the dimming device is changed from a light transmission state to a light scattering state, and the dimming device is in an opaque state, namely a fuzzy state.
Example 2
A liquid crystal dimming device, which is manufactured in a similar manner to the liquid crystal dimming device in embodiment 1 except that: in this embodiment, a lattice photoetching plate with a 5 μm grid pitch is used when preparing a light-transmitting conductive substrate with a relief structure on the surface, and the specific structure of the photoetching plate is shown in fig. 6; in addition, this embodiment liquid crystal light adjusting device still includes power supply module, and power supply module specifically is alternating current power supply, and the last integrated voltage regulating device that has of alternating current power supply, the two poles of the earth of power supply module respectively with the conducting layer electric connection on the two blocks of printing opacity conducting substrate.
The liquid crystal dimming device of the present embodiment has substantially the same structure as the liquid crystal dimming device of embodiment 1, and is different in that: the liquid crystal dimming device further comprises a power supply assembly, wherein two stages of the power supply assembly are electrically connected with the conducting layers on the two light-transmitting conducting substrates respectively; and the photovoltaic structure layers on the two light-transmitting conductive substrates are in a lattice shape.
Example 3
A liquid crystal dimming device, which is manufactured in a similar manner to the liquid crystal dimming device in embodiment 1 except that: in the embodiment, dipentaerythritol hexaacrylate is used for replacing a dipentaerythritol pentaacrylate monomer; and when the light-transmitting conductive substrate with the surface having the relief topography structure is prepared, a checkerboard-shaped photoetching plate with the grid pitch of 5 microns is adopted, and the specific structure of the photoetching plate is shown in fig. 7.
The liquid crystal dimming device of the present embodiment has substantially the same structure as the liquid crystal dimming device of embodiment 1, and is different in that: the pattern structure layer on the two light-transmitting conductive substrates in the liquid crystal dimming device is in a checkerboard shape.
Example 4
A liquid crystal light modulation device is prepared by the following steps:
s1, cutting and preparing a light-transmitting substrate, wherein the light-transmitting substrate can be a glass substrate, and then preparing a conductive layer on the light-transmitting substrate, wherein the surface of the conductive layer is in a wavy undulating shape structure, so as to prepare a first light-transmitting conductive substrate with an undulating shape structure on the surface;
s2, cutting to prepare another light-transmitting substrate, and then preparing a conductive layer on the light-transmitting substrate to prepare a second light-transmitting conductive substrate;
s3, preparing vertical alignment layers on the surfaces of the conductive layers on the first light-transmitting conductive substrate and the second light-transmitting conductive substrate; then oppositely arranging the surfaces with the vertical orientation layers on the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, and packaging to prepare a liquid crystal box;
s4, filling negative liquid crystal HNG30400-200 into a liquid crystal box on a heating table at 100 ℃, and preserving heat for 30min to obtain the liquid crystal dimming device.
The liquid crystal dimming device comprises a first light-transmitting conductive substrate and a second light-transmitting conductive substrate which are oppositely arranged, wherein the first light-transmitting conductive substrate comprises a first light-transmitting substrate and a first conductive layer which are arranged in a stacked mode, and the surface of the first conductive layer is provided with a wavy undulating appearance structure; the second light-transmitting conductive substrate comprises a second light-transmitting substrate and a second conductive layer which are arranged in a stacked mode; the surfaces of the second conducting layer and the second conducting layer are both provided with vertical orientation layers, the two vertical orientation layers are arranged oppositely, an adjusting area is formed between the first light-transmitting conducting substrate and the second light-transmitting conducting substrate, and negative liquid crystals are filled in the adjusting area.
Comparative example 1
A liquid crystal light modulation device is prepared by the following steps:
s1, cutting and preparing a light-transmitting substrate, wherein the light-transmitting substrate can be a glass substrate, and then preparing an ITO (indium tin oxide) conductive layer on the light-transmitting substrate to obtain a first light-transmitting conductive substrate;
s2, preparing a second light-transmitting conductive substrate by the same method as the step S1;
s3, preparing polyimide vertical alignment layers on the surfaces of the conductive layers on the first light-transmitting conductive substrate and the second light-transmitting conductive substrate; then oppositely arranging the surfaces of the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, which are provided with the polyimide vertical alignment layers, and arranging a packaging frame through UV curing adhesive and a spacer of 10 micrometers to package and prepare a liquid crystal box;
s4, filling negative liquid crystal HNG30400-200 (purchased from Jiangsu and Chengshi display science and technology Co., Ltd.) into a liquid crystal box on a heating table at 100 ℃ by virtue of capillary force, and preserving heat for 30min to obtain the liquid crystal dimming device.
The liquid crystal dimming device manufactured by the comparative example comprises two light-transmitting conductive substrates which are oppositely arranged, wherein each light-transmitting conductive substrate comprises a light-transmitting substrate, a conductive layer and a vertical orientation layer which are arranged in a stacked mode, the two vertical orientation layers are oppositely arranged, an adjusting area is formed between the two light-transmitting conductive substrates, and negative liquid crystal is filled in the adjusting area.
The liquid crystal dimming device was connected to the power supply unit in the same manner as in example 1; the liquid crystal dimming devices of example 1 and comparative example 1 were respectively tested for light transmittance as a function of voltage during power-on, and the results are shown in fig. 8. As can be seen from fig. 8, the liquid crystal dimming device of comparative example 1, in which the surface of the light-transmitting conductive substrate does not have the relief structure, has almost no change in light transmittance with an increase in voltage; in the liquid crystal dimming device in embodiment 1, since the surface of the transparent conductive substrate has the surface relief, the light transmittance of the transparent conductive substrate can be reduced along with the increase of the voltage, because the rotation of the negative liquid crystal molecules is limited by the relief structure on the surface of the transparent conductive substrate, and the director of the negative liquid crystal molecules is different when the voltage is applied to the liquid crystal dimming device, so that the light dimming can be realized.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A liquid crystal dimming device, comprising: the light-transmitting substrate comprises a first light-transmitting conductive substrate and a second light-transmitting conductive substrate which are arranged oppositely, wherein vertical orientation layers are arranged on opposite surfaces of the first light-transmitting conductive substrate and the second light-transmitting conductive substrate; the surfaces, attached to the vertical alignment layers, of the first light-transmitting conductive substrate and/or the second light-transmitting conductive substrate are provided with relief structures; an adjusting area is arranged between the first light-transmitting conductive substrate and the second light-transmitting conductive substrate, and negative liquid crystal is filled in the adjusting area.
2. The liquid crystal dimming device of claim 1, wherein the surfaces of the first light-transmissive conductive substrate and the second light-transmissive conductive substrate, which are attached to the vertical alignment layer, each have an undulating topography.
3. The liquid crystal dimming device of claim 2, wherein the relief structures on the surfaces of the first light-transmissive conductive substrate and the second light-transmissive conductive substrate are the same.
4. A liquid crystal dimmer device as claimed in claim 1, wherein the relief structure has a period of 0.5 μm to 50 μm and a height of 100nm to 2000 nm.
5. The liquid crystal dimming device of claim 4, wherein the relief structure is in a wave shape, a lattice shape or a checkerboard shape.
6. The liquid crystal dimming device of claim 1, wherein the height of the adjustment region is 3um to 50 um.
7. The liquid crystal dimming device of claim 1, wherein a spacer is disposed in the adjustment region for supporting the first light-transmissive conductive substrate and the second light-transmissive conductive substrate therebetween.
8. The liquid crystal dimming device according to any one of claims 1 to 7, wherein the first light-transmissive conductive substrate and/or the second light-transmissive conductive substrate comprises a light-transmissive substrate, a conductive layer and a relief structure layer stacked in this order.
9. The liquid crystal dimming device according to any one of claims 1 to 7, wherein the first light-transmissive conductive substrate and/or the second light-transmissive conductive substrate comprises a light-transmissive substrate and a conductive layer stacked in this order; the surface of the conducting layer is of a relief structure.
10. The liquid crystal dimming device of any one of claims 1 to 7, further comprising a power supply assembly, wherein two poles of the power supply assembly are electrically connected to the first light-transmissive conductive substrate and the second light-transmissive conductive substrate, respectively.
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| CN201922029185.XU CN211236504U (en) | 2019-11-21 | 2019-11-21 | Liquid crystal light modulation device |
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| CN201922029185.XU CN211236504U (en) | 2019-11-21 | 2019-11-21 | Liquid crystal light modulation device |
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