CN211014955U - Bistable local light modulator - Google Patents
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- CN211014955U CN211014955U CN201921956876.8U CN201921956876U CN211014955U CN 211014955 U CN211014955 U CN 211014955U CN 201921956876 U CN201921956876 U CN 201921956876U CN 211014955 U CN211014955 U CN 211014955U
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Abstract
The utility model discloses a bistable local light modulation device, it includes: a first transparent substrate and a second transparent substrate, the first transparent substrate and the second transparent substrate being parallel to and disposed opposite to each other; a first transparent electrode formed on the inner side of the first transparent substrate; a second transparent electrode formed on the inner side of the second transparent substrate; a first alignment layer formed inside the first transparent electrode; a liquid crystal layer disposed between the first transparent substrate and the second transparent substrate, the liquid crystal layer comprising a cholesteric liquid crystal composition; at least one of the first transparent electrode and the second transparent electrode is a patterned transparent electrode, and the patterned transparent electrode can be driven in a whole manner or in a partitioned manner. The utility model discloses a bistable liquid crystal light modulation device and preparation method thereof, it has bistable structure, has the energy consumption low, simple structure, with low costs, production technology simplifies, the advantage that the product yield is high.
Description
Technical Field
The utility model relates to a technical field is used to the liquid crystal, in particular to bistable state local light modulator.
Background
At present, the most common liquid crystal dimming film in a liquid crystal dimming device is a liquid crystal dimming film which is mainly composed of a transparent conductive substrate and a liquid crystal layer, the arrangement state of liquid crystal molecules is controlled in an external electric field mode, the transition of the macroscopic state of light transmission and light scattering is realized, and the functions of privacy function, office partition and the like are achieved. With the improvement of life quality, the dimming product with single transmission state and fog state overall conversion can not meet diversified life requirements. Chinese patent No. CN106154616B proposes a method of implementing local dimming by using a liquid crystal film splicing structure, but the preparation process is complex, difficult, and single in form, which limits the application scenarios. Meanwhile, the structure needs to be maintained by a continuously-added electric field in the aspect of state maintenance, so that the energy consumption is large, and the structure does not accord with the energy conservation advocated by the current nation. Therefore, a local dimming technology which has low energy consumption, simple preparation process flow and diversified forms and can meet various application scenes is needed.
Disclosure of Invention
An object of the utility model is to provide a bistable state local dimming device to the above technical problem that exists among the prior art.
The utility model adopts the following technical scheme:
a bistable local dimming device, comprising: a first transparent substrate and a second transparent substrate, the first transparent substrate and the second transparent substrate being parallel to and disposed opposite to each other; a first transparent electrode formed on the inner side of the first transparent substrate; a second transparent electrode formed on the inner side of the second transparent substrate; a first alignment layer formed inside the first transparent electrode; the liquid crystal layer is arranged between the first transparent substrate and the second transparent substrate and comprises a cholesteric liquid crystal composition, at least one of the first transparent electrode and the second transparent electrode is a patterned transparent electrode, and the patterned transparent electrode can be driven integrally or in a partition mode.
Preferably, the liquid crystal display further comprises a second alignment layer formed inside the second transparent electrode.
Preferably, the first transparent electrode is a patterned transparent electrode, and the second transparent electrode is disposed in a whole layer.
Preferably, the first transparent electrode and the second transparent electrode are both patterned transparent electrodes.
Preferably, the pattern of the first transparent electrode and the pattern of the second transparent electrode correspond in position.
Preferably, the display device further comprises a third transparent electrode and an insulating layer, wherein the third transparent electrode is located between the first transparent substrate and the first transparent electrode or located inside the first transparent electrode, and the insulating layer is located between the first transparent electrode and the third transparent electrode.
Preferably, the pattern of the patterned transparent electrode is a circle, a polygon, a bar, a wave, a text, a picture or a combination thereof.
Preferably, the first transparent electrode, the second transparent electrode and/or the third transparent electrode are selected from one or more of indium tin oxide, indium oxide, tin oxide, zinc oxide, silver nanowires, copper nanowires.
Preferably, the display device further comprises a sealant and a spacer, wherein the sealant and the spacer are positioned between the first transparent substrate and the second transparent substrate.
Preferably, the first transparent substrate and the second transparent substrate are selected from one or more of glass, PET, PEN, PC, PP, PMMA, PBT, PVC, PI, cellulose.
The utility model discloses a bistable state local dimming device, the low power dissipation can realize local dimming, and the pattern is diversified, and the application scene is wide.
Drawings
The invention may be better understood by referring to the illustrations of embodiments of the invention in which:
fig. 1 is a schematic cross-sectional view of a bistable local dimming device according to a first embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a bistable local dimming device according to a second embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a bistable local dimming device according to a third embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a bistable local dimming device according to a fourth embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of a bistable local dimming device according to a fifth embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. The illustrated example embodiments of the present invention are provided for illustration only and not to limit the invention. Therefore, the scope of the present invention is not limited by the specific embodiments, but only by the scope of the appended claims.
The bistable local dimming device according to the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
The first embodiment:
fig. 1 is a schematic cross-sectional structure diagram of a bistable local dimming device according to a first embodiment of the present invention, as shown in fig. 1, the bistable local dimming device of this embodiment includes: a first transparent substrate 10 and a second transparent substrate 20, the first transparent substrate 10 and the second transparent substrate 20 being parallel to and facing each other; a first transparent electrode 31 formed inside the first transparent substrate 10; a second transparent electrode 32 formed inside the second transparent substrate 20; a first alignment layer 40 formed inside the first transparent electrode 31; a liquid crystal layer 60 disposed between the first transparent substrate 10 and the second transparent substrate 20, the liquid crystal layer 60 including a cholesteric liquid crystal composition; at least one of the first transparent electrode 31 and the second transparent electrode 32 is a patterned transparent electrode, and after the patterned partition electrodes are formed on the first transparent electrode 31 and/or the second transparent electrode 32, the partitions may be insulated from each other, or may be partially or completely electrically connected as needed, so that partition driving or integral driving may be performed on the patterned transparent electrode.
As shown in fig. 1, in the present embodiment, the second alignment layer 50 is further included inside the second transparent electrode 32, and the first alignment layer 40 and the second alignment layer 50 provide an initial alignment angle for cholesteric liquid crystal in the liquid crystal layer 60 to achieve a fast response along a predetermined direction after driving, but the present invention is not limited thereto, and only the first alignment layer 40 or only one alignment layer in the second alignment layer 50 may be provided, and the first alignment layer 40 and the second alignment layer 50 may have a faster response speed compared to only one alignment layer, and the liquid crystal is more stably arranged when being bistable.
In this embodiment, the steps of forming the first alignment layer 40 and the second alignment layer 50 include obtaining an alignment agent solvent with a certain concentration, coating the alignment agent solution on the surface of the transparent substrate, curing to form the alignment layer, and finally aligning the cured alignment layer, wherein the alignment agent is generally an organic polymer material, such as PVB, siloxane, polyimide, and the like, the coating method includes a spin coating method, a dipping method, a screen printing method, a spraying method, and a slit coating method, the types of the first alignment layer 40 and the second alignment layer 50 include a substantially planar alignment type and a substantially vertical alignment type, the alignment modes include rubbing alignment, photo-controlled alignment, oblique evaporation method alignment, L B film method alignment, and the like, and details are not repeated.
In this embodiment, as shown in fig. 1, the first transparent electrode 31 is a patterned transparent electrode, and the second transparent electrode 32 is disposed in a whole layer. The patterned transparent electrode is, for example, a louver structure composed of a plurality of spaced strips, specifically, the first transparent electrode 31 is a plurality of strip-shaped transparent electrodes formed by etching and insulated from each other, and the transparent electrodes of odd and even strips can be driven separately. The bistable local dimming device of this embodiment comprises two states of zero electric field stability: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light. The patterned first transparent electrode 31 may be integrally or sectionally connected to one or more external drivers, so that the first transparent electrode 31 and the second transparent electrode 32 may be directly driven according to actual needs, and the bistable local dimming device is locally controlled to realize control and switching of a local transmission state or a fog state. Specifically, by controlling the magnitude of the electric field intensity between different regions of the first transparent electrode 31 and the second transparent electrode 32, different arrangement states of liquid crystal in the liquid crystal layer therebetween are realized, and thus two bistable states of a transmission state and a fog state of the liquid crystal dimmer are realized. In the bistable local dimming device in this embodiment, the first transparent electrode 31 is exemplified by a plurality of patterned strip electrodes, and a louver structure in which the odd-numbered transparent electrode regions are in a transparent state and the even-numbered transparent electrode regions are in a foggy state, or a louver structure in which the odd-numbered transparent electrode regions are in a foggy state and the even-numbered transparent electrode regions are in a transparent state may be implemented, or dynamic use of mutual switching between the odd-numbered transparent electrode regions and the even-numbered transparent electrode regions may be implemented by timing control. Preferably, the size of the insulating gap between the plurality of strip-shaped regions is not greater than 100 micrometers, the odd transparent electrode regions and the even transparent electrode regions can be driven simultaneously to enable the whole liquid crystal dimming device to be in a transmission state or a fog state, and the regions except the insulating gap can basically achieve the effect that the whole liquid crystal dimming device is in the transmission state or the fog state (because the liquid crystal in the insulating gap region between the plurality of strip-shaped regions is not controlled by an external electric field, the smaller the gap, the smaller the influence on the whole device). But not limited thereto, the strip-shaped transparent electrodes may be distributed and connected to a plurality of external drivers in any combination to realize different regions or different timing control, for example, as required, and are not described in detail. The utility model discloses in, the pattern of patterned transparent electrode is not limited to the bar pattern of above example, and the pattern of patterned first transparent electrode 31 can also be for circular, polygon, wave, characters, picture or its combination etc. as long as can constitute the characters or the pattern that have certain instruction function or pleasing to the eye function all can, no longer gives unnecessary details.
In this embodiment, the first transparent electrode 31 and the second transparent electrode 32 are preferably made of ITO, but not limited thereto, the first transparent electrode 31 and the second transparent electrode 32 may also be made of a carbon-based conductive film, a metal nanowire conductive film, a metal oxide film, and the like, wherein the carbon-based conductive film mainly includes two types of graphene oxide and carbon nanotube, the metal nanowire conductive film commonly includes silver nanowire, copper nanowire, and the like, and the metal oxide film includes a mixture of indium tin oxide, indium oxide, tin oxide, zinc oxide, and other metal oxides. In this embodiment, as shown in fig. 1, the bistable local dimming device further includes a sealant 70 and a spacer 80 between the first transparent substrate 10 and the second transparent substrate 20. In this embodiment, the sealant 70 is located between the first transparent substrate 10 and the second transparent substrate 20, and is used for bonding and fixing the first transparent substrate 10 and the second transparent substrate 20, and forms a closed space together with the first transparent substrate 10 and the second transparent substrate 20 to accommodate the liquid crystal layer 60 therebetween. The sealant 70 includes a thermal curing adhesive (such as a common epoxy resin) and a photo curing adhesive (such as a common UV adhesive); and UV heating the hybrid glue. In the embodiment of the present invention, the sealant is, for example, UV curable adhesive K-3357 manufactured by koxter corporation. In the embodiment of the present invention, the spacers 80 are located between the first transparent substrate 10 and the second transparent substrate 20 for limiting the thickness of the liquid crystal layer 60, and the spacers 80 can be distributed anywhere between the first transparent substrate 10 and the second transparent substrate 20, including the frame glue. The material of the spacer includes resin, glass fiber, and inorganic materials such as polystyrene, silica, and the like. The spacers may be spherical, rod-like, or otherwise shaped. The size of the spacers depends on the thickness of the liquid crystal layer. In a preferred embodiment, the uniformity of the thickness of the liquid crystal layer 60 can be controlled by means of a device having a lamination function.
The embodiment of the present invention provides a display device, wherein the first transparent substrate 10 and the second transparent substrate 20 are selected from one or more of glass, PET, PEN, PC, PP, PMMA, PBT, PVC, PI, cellulose and other transparent polymer materials, and the first transparent substrate 10 and the second transparent substrate 20 are used for bearing each film layer thereon and forming a flat external protection structure of the bistable local dimming device.
The bistable local light modulator of the utility model has a bistable structure, and does not need to continuously supply power to maintain a certain state, thereby having low power consumption; the adoption of the patterned transparent electrode can realize local dimming, and has diversified patterns and wide application scenes.
Second embodiment:
in this embodiment, the same parts as those in the first embodiment are not repeated, and the difference is that in this embodiment, the first transparent electrode 31 and the second transparent electrode 32 are both patterned transparent electrodes. Fig. 2 is a schematic cross-sectional structure diagram of a bistable local dimming device according to a second embodiment of the present invention, as shown in fig. 2, in this embodiment, a pattern of a first transparent electrode 31 corresponds to a pattern position of a second transparent electrode 32, preferably, the pattern of the first transparent electrode 31 is the same as the pattern of the second transparent electrode 32, and sizes of portions of the patterns are also the same, but not limited thereto, the pattern of the first transparent electrode 31 and the pattern of the second transparent electrode 32 may also be set to be different patterns or different sizes of portions of the patterns according to actual needs, but at least an area overlapping up and down should be provided, and details are not repeated. In this embodiment, the patterned first transparent electrode 31 and the patterned second transparent electrode 32 may be integrally or sectionally connected to one or more external drivers, so that the first transparent electrode 31 and the second transparent electrode 32 may be driven according to actual needs, and the bistable local dimming device is locally controlled to realize control switching of the local transmission state or the fog state, which is not described in detail again.
In this embodiment, for example, the first transparent electrode 31 and the second transparent electrode 32 are both in the shape of a strip, and after being connected to an external driver, the bistable local dimming device of this embodiment can realize the structure of a louver, and realize the control and switching of the transmission state or the fog state in the region where the first transparent electrode 31 and the second transparent electrode 32 are located. But not limited thereto, the first transparent electrode 31 and the second transparent electrode 32 may also respectively adopt other characters or patterns or a combination thereof as needed to realize the control switching of more patterned transmission states or fog states so as to adapt to more other application scenarios, and further description is omitted.
The third embodiment:
in this embodiment, the same parts as the first embodiment are not repeated, and the difference is that in this embodiment, the bistable local light modulator further includes a third transparent electrode 33 formed between the first transparent substrate and the first transparent electrode 31, the first transparent electrode 31 and the third transparent electrode 33 are separated by an insulating layer 34, fig. 3 is a schematic cross-sectional structure diagram of the bistable local light modulator according to the third embodiment of the present invention, as shown in fig. 3, in this embodiment, the third transparent electrode 33 is located between the first transparent substrate 10 and the patterned first transparent electrode 31, and the third transparent electrode 33 is separated from the first transparent electrode 31 by the insulating layer 34.
In this embodiment, the third transparent electrode 33 is disposed in a whole layer, and the bistable local dimming device of this embodiment also includes two stable states with zero electric field: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light. The patterned first transparent electrode 31, the third transparent electrode 33 and the second transparent electrode 32 may all be integrally or respectively connected to one or more external drivers, so that the electric field applied between the first transparent electrode 31, the third transparent electrode 33 and the second transparent electrode 32 may be respectively driven according to actual needs, for example, the electric field applied between the patterned first transparent electrode 31 and the second transparent electrode 32 may be controlled to implement local control of the bistable local dimming device to implement control switching of the local transmission state or the fog state, the electric field applied between the third transparent electrode 33 and the second transparent electrode 32 may also be controlled to implement control of the bistable local dimming device in the transmission state or the fog state as a whole, and the electric field applied between the first transparent electrode 31 and the second transparent electrode 32 and the electric field applied between the third transparent electrode 33 and the second transparent electrode 32 may also be simultaneously controlled to implement control of the transmission state or the fog state in different regions Switching is not described in detail.
In this embodiment, for example, after the first transparent electrode 31 is in a strip shape and connected to an external driver, the bistable local light modulator of this embodiment can realize a structure of a louver, and can simultaneously realize control switching of a transmission state or a fog state in a region corresponding to the first transparent electrode 31 and the second transparent electrode 32, and control switching of a transmission state or a fog state in a region corresponding to the third transparent electrode 33 and the second transparent electrode 32. However, the embodiment is not limited thereto, and the pattern of the first transparent electrode 31 may also adopt other characters or patterns or a combination thereof according to needs, so as to implement more kinds of patterned transmission states or fog states for controlling and switching, so as to adapt to more other application scenarios, and further description is omitted.
The fourth embodiment:
in this embodiment, the third transparent electrode 33 is located inside the first transparent electrode 31, i.e. formed on the side of the patterned first transparent electrode 31 close to the liquid crystal layer 60, and the third transparent electrode 33 is separated from the first transparent electrode 31 by the insulating layer 34.
Fig. 4 is a schematic cross-sectional structure diagram of a bistable local dimming device according to a fourth embodiment of the present invention, as shown in fig. 4, in this embodiment, the third transparent electrode 33 is disposed in a whole layer, and the bistable local dimming device of this embodiment also includes two stable states with zero electric field: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light. The patterned first transparent electrode 31, the third transparent electrode 33 and the second transparent electrode 32 may all be integrally or respectively connected to one or more external drivers, so that the electric field applied between the first transparent electrode 31, the third transparent electrode 33 and the second transparent electrode 32 may be respectively driven according to actual needs, for example, the electric field applied between the patterned first transparent electrode 31 and the second transparent electrode 32 may be controlled to implement local control of the bistable local dimming device to implement control switching of the local transmission state or the fog state, the electric field applied between the third transparent electrode 33 and the second transparent electrode 32 may also be controlled to implement control of the bistable local dimming device in the transmission state or the fog state as a whole, and the electric field applied between the first transparent electrode 31 and the second transparent electrode 32 and the electric field applied between the third transparent electrode 33 and the second transparent electrode 32 may also be simultaneously controlled to implement control of the transmission state or the fog state in different regions Switching is not described in detail.
In this embodiment, for example, after the first transparent electrode 31 is in a strip shape and connected to an external driver, the bistable local light modulator of this embodiment can realize a structure of a louver, and can simultaneously realize control switching of a transmission state or a fog state in a region corresponding to the first transparent electrode 31 and the second transparent electrode 32, and control switching of a transmission state or a fog state in a region corresponding to the third transparent electrode 33 and the second transparent electrode 32. However, the embodiment is not limited thereto, and the pattern of the first transparent electrode 31 may also adopt other characters or patterns or a combination thereof according to needs, so as to implement more kinds of patterned transmission states or fog states for controlling and switching, so as to adapt to more other application scenarios, and further description is omitted.
Fifth embodiment:
the same parts of this embodiment as the fourth embodiment are not repeated, and the differences are that in this embodiment, the third transparent electrode 33 is also a patterned transparent electrode, and the electrode regions of the patterned first transparent electrode 31 and the patterned third transparent electrode 33 are arranged in a staggered manner.
Fig. 5 is a schematic cross-sectional structure diagram of a bistable local dimming device according to a fifth embodiment of the present invention, as shown in fig. 5, in this embodiment, the first transparent electrode 31 and the third transparent electrode 33 are both patterned transparent electrodes, and the bistable local dimming device of this embodiment also includes two stable states with zero electric field: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light. In this embodiment, the patterned first transparent electrode 31, the patterned third transparent electrode 33, and the second transparent electrode 32 disposed in an entire layer may be integrally or separately connected to one or more external drivers, so that the electric field applied between the first transparent electrode 31, the third transparent electrode 33, and the second transparent electrode 32 may be separately driven according to actual needs, for example, the electric field applied between the patterned first transparent electrode 31 and the second transparent electrode 32 may be controlled to locally control the bistable local dimming device to realize the control switching of the local transmission state or the fog state, the electric field applied between the patterned third transparent electrode 33 and the second transparent electrode 32 may also be controlled to realize the control switching of the local dimming device to realize the control switching of the local transmission state or the fog state, and the electric field applied between the first transparent electrode 31 and the second transparent electrode 32 may also be controlled, for example, in a time-sequential manner, The electric field applied between the third transparent electrode 33 and the second transparent electrode 32 realizes dynamic control switching of the transmission state or the fog state in different areas, which is not described in detail.
In this embodiment, for example, after the first transparent electrode 31 and the third transparent electrode 33 are both in the shape of a strip and connected to an external driver, the bistable local dimming device of this embodiment can realize the structure of a louver, and can simultaneously realize the control and switching of the transmission state or the fog state in the region corresponding to the first transparent electrode 31 and the second transparent electrode 32, and the control and switching of the transmission state or the fog state in the region corresponding to the third transparent electrode 33 and the second transparent electrode 32. However, the embodiment is not limited thereto, and the pattern of the first transparent electrode 31 may also adopt other characters or patterns or a combination thereof according to needs, so as to implement more kinds of patterned transmission states or fog states for controlling and switching, so as to adapt to more other application scenarios, and further description is omitted.
In this embodiment, the electrode regions of the patterned first transparent electrode 31 and the patterned third transparent electrode 33 are arranged in a staggered manner, and the patterns of the first transparent electrode 31 and the third transparent electrode 33 may be arranged in a complementary staggered manner, or may be partially overlapped or completely overlapped according to the requirement, which is not described again.
The utility model discloses a bistable state liquid crystal light modulation device, it has bistable structure to can carry out regional drive control as required locally, realize seeing through the local control of attitude and fog attitude, have that the energy consumption is low, simple structure, with low costs, production technology simplify, the advantage that the product yield is high.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. A bistable local dimming device, comprising:
a first transparent substrate and a second transparent substrate, the first transparent substrate and the second transparent substrate being parallel to and disposed opposite to each other;
a first transparent electrode formed on the inner side of the first transparent substrate;
a second transparent electrode formed on the inner side of the second transparent substrate;
a first alignment layer formed inside the first transparent electrode;
a liquid crystal layer disposed between the first transparent substrate and the second transparent substrate, the liquid crystal layer comprising a cholesteric liquid crystal composition,
wherein at least one of the first transparent electrode and the second transparent electrode is a patterned transparent electrode, and the patterned transparent electrode can be driven in an integral manner or in a divisional manner.
2. The bistable local dimming device of claim 1, further comprising a second alignment layer formed inside said second transparent electrode.
3. A bistable local dimming device according to claim 1 or 2, wherein the first transparent electrode is a patterned transparent electrode and the second transparent electrode is provided in a single layer.
4. The bistable local dimming device of claim 1 or 2, wherein said first transparent electrode and said second transparent electrode are each patterned transparent electrodes.
5. The bistable local dimming device of claim 4, wherein said first transparent electrode pattern and said second transparent electrode pattern correspond in position.
6. The bistable local dimming device of claim 3, further comprising a third transparent electrode positioned between said first transparent substrate and said first transparent electrode or inside said first transparent electrode, and an insulating layer positioned between said first transparent electrode and said third transparent electrode.
7. The bistable local dimming device of claim 1, wherein the pattern of said patterned transparent electrode is circular, polygonal, bar-shaped, wave-shaped, text, picture or a combination thereof.
8. The bistable local dimming device of claim 1, further comprising a sealant and a spacer between the first transparent substrate and the second transparent substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921956876.8U CN211014955U (en) | 2019-11-13 | 2019-11-13 | Bistable local light modulator |
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Assignee: Suzhou Zhengdao Optoelectronic Materials Co.,Ltd. Assignor: SMART LIQUID CRYSTAL TECHNOLOGIES Co.,Ltd. Contract record no.: X2024980002575 Denomination of utility model: A bistable local dimming device Granted publication date: 20200714 License type: Exclusive License Record date: 20240308 |
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