CN111694197A - Color bistable light modulator - Google Patents
Color bistable light modulator Download PDFInfo
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- CN111694197A CN111694197A CN201910192300.7A CN201910192300A CN111694197A CN 111694197 A CN111694197 A CN 111694197A CN 201910192300 A CN201910192300 A CN 201910192300A CN 111694197 A CN111694197 A CN 111694197A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1391—Bistable or multi-stable liquid crystal cells
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13731—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a field-induced phase transition
- G02F1/13737—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a field-induced phase transition in liquid crystals doped with a pleochroic dye
Abstract
The invention discloses a color dimming device, which comprises a first transparent conductive base layer, a liquid crystal layer and a second transparent conductive base layer which are sequentially stacked, wherein the liquid crystal layer comprises a liquid crystal composition, the liquid crystal composition comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye, and the color dimming device comprises two stable states of zero electric field: a transmitted state in which the transmitted light is substantially directed, and a fogged state in which the transmitted light is substantially scattered. The invention can realize color bistable state maintained by zero electric field, can be applied to light-adjusting glass, and provides light transmittance, privacy isolation and beautiful decoration.
Description
Technical Field
The invention relates to the field of liquid crystal-based dimming, in particular to a color bistable dimming device.
Background
The liquid crystal-based dimming device is mainly composed of a transparent base material and a liquid crystal material, and the arrangement state of liquid crystal molecules is regulated and controlled in an external electric field mode, so that the conversion between full transparency and non-transparency is realized. Due to the unique dimming characteristic, liquid crystal-based dimming devices, such as intelligent glass, are widely applied to industries such as buildings, houses and automobiles, and are used for achieving the functions of adjusting light transmittance, increasing privacy, blocking ultraviolet rays or infrared rays and the like. The bistable or multistable dimming device has the characteristic of no need of electric field maintenance, and has energy-saving safety and wider application prospect.
The bistable light-adjusting device available on the market generally uses the light scattering principle to realize the fog state opaque state. However, the device aims at full spectrum scattering, and the generated scattered light is white light or light rays similar to the white light, can only be converted between colorless transparency and the similar white light, and cannot realize color performance, so that the attractiveness of the device is reduced, and the application range is further limited. And the colored membrane of adjusting luminance on the market, mostly adopt to add the dyestuff in PDLC and realize, but add the dyestuff and can reduce the performance of membrane of adjusting luminance, PDLC membrane needs the electric field to maintain its steady state simultaneously, is unfavorable for energy-conservingly. Another solution is to add a color film on a general bistable light modulator to realize color performance, but the color film increases light scattering in a transparent state, thereby reducing transparency, and increasing thickness and manufacturing cost of the light modulator.
Therefore, it is desirable to provide a light modulator device that has color properties, is bistable, maintains the original properties, and has a simple manufacturing process and low cost.
Disclosure of Invention
In order to meet the above requirements, the present invention provides a color light modulation device, where the color light modulation device includes a first transparent conductive base layer, a liquid crystal layer, and a second transparent conductive base layer, which are sequentially stacked, the liquid crystal layer includes a liquid crystal composition, the liquid crystal composition includes a bimesogenic compound, a nematic liquid crystal compound, a chiral compound, and an oil-based dye, and the color light modulation device includes two stable states with zero electric field: a transmitted state in which the transmitted light is substantially directed, and a fogged state in which the transmitted light is substantially scattered.
In some embodiments, the liquid crystal layer has a thickness of 2 to 60 microns. In a preferred embodiment, the thickness of the liquid crystal layer is 5-60 microns.
In a preferred embodiment, the first transparent conductive base layer and the second transparent conductive base layer each independently include a transparent substrate and a transparent electrode, wherein the transparent electrode is disposed between the transparent substrate and the liquid crystal layer. In some embodiments, the transparent substrate is glass or a polymeric material. In some embodiments, the transparent electrode is a carbon-based conductive thin film, a metal nanowire conductive thin film, or a metal oxide conductive thin film.
In some embodiments, the color dimming device further comprises at least one alignment layer disposed between the first transparent conductive base layer paste and the liquid crystal layer and/or between the second transparent conductive base layer and the liquid crystal layer. In a preferred embodiment, the alignment layer comprises a substantially planar alignment type and a substantially homeotropic alignment type.
In a preferred embodiment, the oily dye accounts for no more than 5% by mass of the liquid crystal composition. In a more preferred embodiment, the oily dye accounts for 0.01 to 1% by mass of the liquid crystal composition.
In some embodiments, the bimesogenic compound comprises 5% to 50% by weight of the liquid crystal composition. In a preferred embodiment, the bimesogenic compound accounts for 15 to 50% by mass of the liquid crystal composition.
The color bistable light modulator disclosed by the invention can realize color bistable state maintained by a zero electric field by introducing the bimesogenic compound and the oily dye with certain solubility in liquid crystal, has lower transmission state haze and higher fog state haze, can be applied to light modulation glass, and provides light transmittance, privacy isolation and beautiful decoration.
Drawings
The invention may be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a color light modulation device disclosed in the present invention;
FIG. 2 is a schematic diagram of the two stable states of the color dimmer device disclosed herein;
FIG. 3 is a schematic diagram of a color light modulator device according to the present disclosure;
FIG. 4 is a schematic diagram of a color modulator device according to the present disclosure comprising (a) one alignment layer and (b) two alignment layers;
fig. 5 is an absorption spectrum of a color dimming device prepared according to an embodiment of the present invention in (a) a transmission state and (b) a fog state;
fig. 6 is an absorption spectrum of a color dimming device prepared according to an embodiment of the present invention in (a) a transmission state and (b) a fog state.
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. In other instances, well-known structures and devices are shown in block diagram form. In this regard, the illustrated example embodiments are provided for purposes of illustration only and are not intended to be limiting of the invention. Therefore, it is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.
Referring first to fig. 1, there is shown a color dimming device having a structure including a first transparent conductive base layer 1, a second transparent conductive base layer 2, and a liquid crystal layer 3 interposed therebetween, wherein the liquid crystal layer 3 has a thickness of 2-60 μm. Preferably, the thickness of the liquid crystal layer is 5-60 microns. The color dimming device has two states of zero field stability: a transmitted state in which the transmitted light is substantially directed, and a fogged state in which the transmitted light is substantially scattered.
The liquid crystal layer 3 contains a liquid crystal composition, and the liquid crystal composition comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye. The bimesogenic compound in the liquid crystal composition is a liquid crystal compound containing two mesogens in the molecule, namely the bimesogenic compound has two groups capable of inducing liquid crystal phase. In the embodiment of the invention, the bimesogenic compound accounts for 5 to 50 percent of the mass of the liquid crystal composition. Preferably, the bimesogenic compound accounts for 10 to 50 percent of the liquid crystal composition by mass. Nematic liquid crystals are commonly used liquid crystal compounds or liquid crystal mixtures having a nematic phase, such as 5CB, 2CB or E7. However, the nematic liquid crystal compound in the present invention does not include bimesogenic compounds that induce a nematic phase. The oily dye can absorb light with specific wavelength in the range of 380 nm-780 nm and has certain solubility in liquid crystal. In the examples of the present invention, an oily dye available from colore chemical ltd, aster, dong, was used: scarlet D-001 and blue D-002. In the embodiment of the invention, the oily dye accounts for no more than 5% of the liquid crystal composition by mass. Preferably, the oily dye accounts for 0.01-1% of the liquid crystal composition by mass percent.
As shown in fig. 2, the bimesogenic compound and the nematic liquid crystal compound can form a chiral nematic phase (i.e., a cholesteric phase) under the action of the chiral compound, so that the dimming device has two stable states: a transmission state in which transmitted light is substantially directed (fig. 2(a)) and a fog state in which transmitted light is substantially scattered (fig. 2 (b)). In the transmissive state, the cholesteric liquid crystal molecules 301 are substantially parallel to the surface of the light modulating device, with their helical axes perpendicular to the surface of the light modulating device. Forming a planar texture of cholesteric liquid crystal, in which state the transmitted light passes through the light modulating device substantially unaffected by the original angle of incidence; in the foggy state, the cholesteric liquid crystal molecules form a focal conic texture, and at the moment, the transmitted light is basically scattered to form a state with larger haze. Due to the special elastic coefficient of the bimesogenic compound, the uniformity of the plane arrangement of liquid crystal molecules can be improved, and the texture defect is reduced, so that the haze of the color dimming device in a transmission state is reduced, and the haze of the haze is improved. The oily dye molecules 302 dispersed in the liquid crystal molecules absorb incident light with a specific wavelength, so that the light modulation device presents a specific color, and the transmission direction of transmitted light is basically not influenced, and the haze of a transmission state and a fog state can be basically not influenced. In addition, the transmission state and the fog state of the color light modulation device are maintained without an external electric field, and the stable state of a zero electric field can be realized. By selecting a proper driving mode, the color dimming device can be switched between a transmission state and a fog state of a specific color along the color, so that the purpose of dimming is achieved.
Referring to fig. 3, the first and second transparent conductive base layers 1 and 2 may further each include a transparent substrate 11 and a transparent electrode 12, wherein the transparent electrode 12 is disposed on an inner surface of the transparent conductive base layer, i.e., a surface where the transparent substrate 11 and the liquid crystal layer 3 are in contact. The transparent substrate 11 may be transparent glass, or may be transparent polymer material, such as PET, PEN, PC, PP, PMMA, PBT, PVC, PI, cellulose, etc. However, the present invention is not limited thereto, and other materials having a transmittance meeting the requirement may be used. The transparent electrode 12 may be formed as a thin film covering the entire inner surface of the transparent substrate as shown in fig. 3, or may be further etched into a specific shape or divided into a plurality of corresponding sub-electrodes as required. The transparent electrode may include a carbon-based conductive film, a metal nanowire conductive film, a metal oxide conductive film, and the like, according to conductive materials. The carbon-based conductive material mainly includes graphene oxide and carbon nanotubes, the metal nanowire conductive film usually adopts silver nanowires or copper nanowires, and the metal oxide conductive film is mainly made of a mixed system of Indium Tin Oxide (ITO), indium oxide, tin oxide, zinc oxide and other metal oxides. In the following examples, the transparent electrode is an ITO electrode.
As shown in fig. 4, the color dimming device may further include an alignment layer 4. In general, a liquid crystal device is manufactured by rubbing a surface of a substrate contacting liquid crystal in a certain direction so that liquid crystal molecules are aligned along the rubbing direction. By adding the alignment layer and then rubbing, a better orientation effect can be obtained. The alignment layer 4 may have only a single layer, as shown in fig. 4(a), disposed on the inner surface (surface in contact with the liquid crystal layer 3) of any one of the first transparent conductive base layer 1 and the second transparent conductive base layer 2; it is also possible to have a double layer, as shown in fig. 4(b), on the inner surfaces of the first transparent conductive base layer 1 and the second transparent conductive base layer 2, respectively, to further enhance the orientation effect. In the following examples, a double-layer alignment layer structure is employed. The alignment layer 4 is generally formed by curing an alignment agent, wherein the alignment agent is an organic polymer material, such as PVB, siloxane, polyimide material, and the like. According to the difference of the pretilt angles (namely the included angles formed by the long axis directions of the molecules and the surface of the alignment layer when the liquid crystal molecules are orderly arranged on the surface of the alignment layer), the alignment layer is divided into a substantially plane alignment type alignment layer, namely the long axis of the liquid crystal molecules on the surface of the alignment layer is substantially parallel to the surface of the alignment layer, such as IPS, TN and STN types; or a substantially homeotropic alignment layer, i.e. the long axes of the liquid crystal molecules are substantially perpendicular to the surface of the alignment layer, such as a VA-type.
The structure and optical performance of the color light modulation device will be described in detail with reference to specific embodiments. In the following examples, the haze of the transmission state and the haze state was measured by a WGT-S type haze meter, and the absorption spectrum of the color dimming device was measured by a general uv-vis spectrometer.
For convenience of expression, in the following examples, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1. The structures and the codes of the chiral compounds used are also listed in table 2. The liquid crystal composition is prepared by mass percent.
TABLE 1 liquid Crystal Compound group Structure code
Wherein, if n is "3", it is represented by alkyl-C3H7Or a spacer group-C3H6-。
TABLE 2 code and Structure of chiral Compounds
Comparative example 1
The light modulation device in this comparative example includes first and second transparent conductive base layers, two alignment layers, and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a nematic liquid crystal compound and a chiral compound, a bimesogenic compound and a dye are not adopted, and the specific formula is shown in Table 3. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze is 25.6%, and the haze is 64.3%.
TABLE 3 liquid crystal composition formula
Comparative example 2
The light modulation device in this comparative example includes first and second transparent conductive base layers, two alignment layers, and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound and a chiral compound, and a specific formula of the liquid crystal composition is shown in Table 4 without using a dye. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the haze in the transmission state is 0.9 percent, and the haze in the fog state is 90.4 percent.
TABLE 4 liquid crystal composition formula
Example 1
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-001, and the specific formula is shown in Table 5. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 1.2%, and the haze was 82.4%. Meanwhile, the absorption spectra of the dimming device in the transmission state and the fog state are measured, and as shown in fig. 5, the absorption spectrum is absorbed at about 525nm, so that the dimming device is red in the transmission state and the fog state.
TABLE 5 liquid Crystal composition formulations
Example 2
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-002, and the specific formula is shown in Table 6. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 1.2%, and the haze was 89.7%. Meanwhile, the absorption spectra of the light modulation device in the transmission state and the fog state are measured, as shown in fig. 6, a plurality of absorption spectra are respectively arranged between 550 nm and 650nm, so that the light modulation device is blue in the transmission state and the fog state.
TABLE 6 liquid crystal composition formula
Example 3
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-002, and the specific formula is shown in Table 7. The thickness of the liquid crystal layer is 20 microns, the transparent conductive base layer is made of glass/ITO, and the type of the alignment layer is VA type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 1.5%, and the haze was 89.4%.
TABLE 7 liquid crystal composition formulations
Example 4
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-001, and the specific formula is shown in Table 8. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 1.6%, and the haze was 84.2%.
TABLE 8 liquid crystal composition formula
Example 5
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-001, and the specific formula is shown in Table 9. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 0.58% and the haze was 80.5%.
TABLE 9 liquid Crystal composition formulations
Example 6
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-002, and the specific formula is shown in Table 10. The thickness of the liquid crystal layer is 5 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the haze in the transmission state was 0.9%, and the haze in the haze state was 65.2%.
TABLE 10 liquid crystal composition formulations
Example 7
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-001, and the specific formula is shown in Table 11. The thickness of the liquid crystal layer is 9 micrometers, the transparent conductive base layers are all made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 1.7%, and the haze was 80.3%.
TABLE 11 liquid crystal composition formula
Example 8
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-001, and the specific formula is shown in Table 12. The thickness of the liquid crystal layer is 50 microns, the transparent conductive base layer is made of glass/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 1.8%, and the haze was 89.0%.
TABLE 12 liquid crystal composition formulations
Example 9
The light modulation device in the embodiment comprises a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers and a liquid crystal layer. The liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye D-001, and the specific formula is shown in Table 13. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all made of PET/ITO, and the type of the alignment layer is an IPS type. Selecting proper voltage to drive the light modulation device to a stable transmission state and a stable fog state respectively, measuring the fog degree of the light modulation device, and obtaining the result: the transmission haze was 1.3%, and the haze was 86.5%.
TABLE 13 liquid crystal composition formulations
Through the above embodiments and comparative examples, it can be seen that the color light modulation device of the present invention can realize a transmission state and a fog state with stable zero electric field, and has lower transmission state haze and higher fog state haze, and can realize color bistable state, thereby further increasing aesthetic property on the basis of high light transmittance and privacy isolation.
Although several exemplary embodiments have been described above in detail, the disclosed embodiments are merely exemplary and not limiting, and those skilled in the art will readily appreciate that many other modifications, adaptations, and/or alternatives are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the present disclosure. Accordingly, all such modifications, adaptations, and/or alternatives are intended to be included within the scope of the present disclosure as defined by the following claims.
Claims (9)
1. A color light modulation device, comprising a first transparent conductive base layer, a liquid crystal layer, a second transparent conductive base layer, which are sequentially stacked, wherein the liquid crystal layer comprises a liquid crystal composition, the liquid crystal composition comprises a bimesogenic compound, a nematic liquid crystal compound, a chiral compound and an oily dye, and wherein the color light modulation device comprises two states of zero electric field stabilization: a transmitted state in which the transmitted light is substantially directed, and a fogged state in which the transmitted light is substantially scattered.
2. The color dimming device of claim 1, wherein the liquid crystal layer has a thickness of 2-60 microns.
3. The color dimming device of claim 1, the first and second transparent conductive base layers each independently comprising a transparent substrate and a transparent electrode, wherein the transparent electrode is disposed between the transparent substrate and the liquid crystal layer.
4. The color dimmer device of claim 3, the transparent substrate being a glass or polymer material.
5. The color light modulation device according to claim 3, wherein said transparent electrode is a carbon-based conductive film, a metal nanowire conductive film or a metal oxide conductive film.
6. The color dimming device of claim 1, further comprising at least one alignment layer disposed between the first transparent conductive base layer and the liquid crystal layer and/or between the second transparent conductive base layer and the liquid crystal layer.
7. The color dimming device of claim 6, the alignment layer comprising a substantially planar alignment type and a substantially homeotropic alignment type.
8. The color light modulation device according to claim 1, wherein the oil-based dye accounts for no more than 5% by mass of the liquid crystal composition.
9. The color light modulation device according to claim 1, wherein the bimesogenic compound is 5% to 50% by mass of the liquid crystal composition.
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| CN114442348A (en) * | 2022-02-09 | 2022-05-06 | 哈尔滨工业大学 | Light modulation device with multifunctional electric control optical characteristic |
| WO2023065925A1 (en) * | 2021-10-22 | 2023-04-27 | 江苏集萃智能液晶科技有限公司 | Liquid crystal dimming device |
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| CN104293359A (en) * | 2013-07-18 | 2015-01-21 | 法国圣戈班玻璃公司 | Liquid crystal polymer composition, preparation method thereof and liquid crystal product containing the same |
| CN208334818U (en) * | 2018-07-10 | 2019-01-04 | 江苏集萃智能液晶科技有限公司 | A kind of adjustable glasses of mist degree |
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| CN104293359A (en) * | 2013-07-18 | 2015-01-21 | 法国圣戈班玻璃公司 | Liquid crystal polymer composition, preparation method thereof and liquid crystal product containing the same |
| CN208334818U (en) * | 2018-07-10 | 2019-01-04 | 江苏集萃智能液晶科技有限公司 | A kind of adjustable glasses of mist degree |
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| WO2023065925A1 (en) * | 2021-10-22 | 2023-04-27 | 江苏集萃智能液晶科技有限公司 | Liquid crystal dimming device |
| CN114442348A (en) * | 2022-02-09 | 2022-05-06 | 哈尔滨工业大学 | Light modulation device with multifunctional electric control optical characteristic |
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Application publication date: 20200922 Assignee: Suzhou Zhengdao Optoelectronic Materials Co.,Ltd. Assignor: SMART LIQUID CRYSTAL TECHNOLOGIES Co.,Ltd. Contract record no.: X2024980002575 Denomination of invention: A Color Bistable Dimming Device Granted publication date: 20231103 License type: Exclusive License Record date: 20240308 |