CN111694197B - Color bistable light modulation device - Google Patents
Color bistable light modulation device Download PDFInfo
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- CN111694197B CN111694197B CN201910192300.7A CN201910192300A CN111694197B CN 111694197 B CN111694197 B CN 111694197B CN 201910192300 A CN201910192300 A CN 201910192300A CN 111694197 B CN111694197 B CN 111694197B
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Classifications
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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
-
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
- G02F1/13718—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 light modulation device, which comprises a first transparent conductive base layer, a liquid crystal layer and a second transparent conductive base layer which are sequentially laminated, 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 light modulation device comprises two states with stable zero electric field: a transmitted state in which the transmitted light is substantially direct and a haze state in which the transmitted light is substantially scattered. The invention can realize bistable state with color and zero electric field maintenance, can be applied to dimming glass, and provides attractive decoration while providing light transmittance and privacy isolation.
Description
Technical Field
The invention relates to the field of liquid crystal base dimming, in particular to a color bistable dimming device.
Background
The liquid crystal base light modulation device is used as a device applying photoelectric effect and mainly comprises a transparent base material and a liquid crystal material, and the arrangement state of liquid crystal molecules is regulated and controlled by an external electric field mode, so that the conversion between full transparency and non-transparency is realized. Because of the unique dimming characteristic, liquid crystal-based dimming devices, such as intelligent glass, are widely used in industries of building, home, automobiles and the like for realizing the functions of adjusting light transmittance, increasing privacy, blocking ultraviolet rays or infrared rays and the like. The bistable or multistable light modulation device has the characteristics of no electric field maintenance, energy saving and safety, and wider application prospect.
Bistable dimming devices currently available on the market generally use the principle of light scattering to achieve a haze opaque state. However, the device aims at full spectrum scattering, and the generated scattered light is white light or light similar to white light, and can only be converted between colorless transparent light and near white light, so that the color performance can not be realized, the aesthetic property of the device is reduced, and the application range is further limited. However, adding dye into PDLC reduces the performance of the dimming film, and the PDLC film requires an electric field to maintain its stable state, which is not beneficial to energy saving. Another solution is to add a color film to a typical bistable light modulator to achieve color performance, but the color film increases the scattering of light in the transparent state, thereby reducing the transparency and increasing the thickness and manufacturing cost of the light modulator.
Therefore, it is desirable to provide a light modulator that has color properties, achieves bistable states, maintains the original properties, and has a simple production process and low cost.
Disclosure of Invention
In order to meet the above-mentioned needs, the present invention provides a color light modulation device, which includes a first transparent conductive substrate, a liquid crystal layer, and a second transparent conductive substrate, wherein the first transparent conductive substrate, the liquid crystal layer, and the second transparent conductive substrate 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 oily 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 direct and a haze state in which the transmitted light is substantially scattered.
In some embodiments, the thickness of the liquid crystal layer is 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 film, a metal nanowire conductive film, or a metal oxide conductive film.
In some embodiments, the color dimming device further comprises at least one alignment layer disposed between the liquid crystal layers of the first transparent conductive base layer paste and/or between the second transparent conductive base layer and the liquid crystal layers. In a preferred embodiment, the alignment layer comprises a substantially planar orientation type and a substantially vertical orientation type.
In a preferred embodiment, the oily dye comprises no more than 5% by mass of the liquid crystal composition. In a more preferred embodiment, the oily dye comprises 0.01 to 1% by mass of the liquid crystal composition.
In some embodiments, the bimesogenic compound is 5% to 50% by mass of the liquid crystal composition. In a preferred embodiment, the bimesogenic compound is present in an amount of 15% to 50% by mass of the liquid crystal composition.
The color bistable light modulation device disclosed by the invention can realize color bistable state maintained by zero electric field through introducing the double mesogenic compound and the oily dye with certain solubility in liquid crystal, has lower transmission state haze and higher haze state haze, can be applied to light modulation glass, and provides attractive decoration while providing light transmittance and privacy isolation.
Drawings
The invention may be better understood by reference to the following description of an embodiment of the invention, taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of a color dimmer device according to the present disclosure;
FIG. 2 is a schematic diagram of two steady state operating principles of the color dimmer device of the present disclosure;
fig. 3 is a schematic structural view of a color light modulating device of the present disclosure;
FIG. 4 is a schematic diagram of a color light modulating device having (a) one alignment layer and (b) two alignment layers according to the present disclosure;
fig. 5 is an absorption spectrum of a color light modulating device prepared according to an embodiment of the present invention in (a) a transmissive state and (b) a fog state;
fig. 6 is an absorption spectrum of a color light modulating device prepared according to an embodiment of the present invention in (a) a transmissive 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 one 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 illustrative example embodiments are presented for purposes of illustration only and are not intended to be limiting of the invention. Accordingly, the scope of the invention is not to be limited by the specific embodiments described above, but only by the scope of the appended claims.
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 thickness of the liquid crystal layer 3 is 2 to 60 μm. Preferably, the thickness of the liquid crystal layer is 5-60 microns. The color dimmer device has two states of zero electric field stability: a transmitted state in which the transmitted light is substantially direct and a haze state in which the transmitted light is substantially scattered.
The liquid crystal layer 3 contains a liquid crystal composition including a bimesogenic compound, a nematic liquid crystal compound, a chiral compound, and an oily dye. The bimesogenic compounds in the liquid crystal composition are liquid crystal compounds comprising two mesogenic groups in the molecule, that is to say bimesogenic compounds have two groups capable of inducing a liquid crystal phase. In an embodiment of the invention, the bimesogenic compound is present in an amount of 5% to 50% by mass of the liquid crystal composition. Preferably, the bimesogenic compound is present in an amount of 10% to 50% by mass of the liquid crystal composition. Nematic liquid crystals are commonly used liquid crystal compounds or liquid crystal mixtures with a nematic phase, such as 5CB, 2CB or E7. The nematic liquid crystal compounds in the present invention do not include nematic-inducible bimesogenic compounds. The oily dye can absorb light with specific wavelength within 380-780 nm and has certain solubility in liquid crystal. In the examples of the present invention, an oily dye purchased from the company of color-light chemical Co., ltd. In the Aster city was used: scarlet D-001 and blue D-002. In an embodiment of the invention, the oily dye comprises no more than 5% by mass of the liquid crystal composition. Preferably, the oily dye accounts for 0.01-1% of the mass of the liquid crystal composition.
As shown in fig. 2, the bimesogenic compound and the nematic liquid crystal compound can form a chiral nematic phase (i.e., cholesteric phase) under the action of the chiral compound, thereby providing the dimming device with two stable states: a transmitted state in which the transmitted light is substantially direct (fig. 2 (a)) and a fog state in which the 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 the cholesteric liquid crystal in which transmitted light passes through the dimmer device substantially unaffected; in the haze state, cholesteric liquid crystal molecules form a focal conic texture, where transmitted light is substantially scattered, resulting in a state of greater haze. The bimesogenic compound can improve the uniformity of the planar arrangement of liquid crystal molecules and reduce texture defects due to the special elastic coefficient, so that the haze of the color light modulation device in a transmission state is reduced, and the haze of the fog state is improved. The oily dye molecules 302 dispersed in the liquid crystal molecules can make the light modulation device show specific color by absorbing the incident light with specific wavelength, and have no influence on the transmission direction of the transmitted light, and have no influence on the haze of the transmission state and the haze. In addition, the transmission state and the fog state of the color light modulation device are not required to be maintained by an external electric field, and the stable state of zero electric field can be realized. By selecting a proper driving mode, the color light modulation device can be switched between a transmission state and a fog state of a specific edge color, so that the light modulation purpose is realized.
Referring to fig. 3, the first transparent conductive base layer 1 and the second transparent conductive base layer 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 a 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 transmittance satisfying 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 sub-electrodes as needed. The transparent electrode can comprise a carbon 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 comprises 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, ITO electrodes were used as the transparent electrodes.
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 base layer in contact with liquid crystal in a certain direction so that liquid crystal molecules are aligned in the rubbing direction. By increasing the rubbing of the alignment layer, a better alignment effect can be obtained. As shown in fig. 4 (a), the alignment layer 4 may have only a single layer and be provided on the inner surface (the surface in contact with the liquid crystal layer 3) of either one of the first transparent conductive base layer 1 and the second transparent conductive base layer 2; as shown in fig. 4 (b), the transparent conductive film may have a double layer 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 alignment effect. In the following examples, a dual alignment layer structure was used. 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 pretilt angles (namely, the included angles formed by the long axis direction 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 an alignment layer with a basically plane orientation, namely, the long axis of the liquid crystal molecules on the surface of the alignment layer is basically parallel to the surface of the alignment layer, such as IPS, TN, STN type; or a substantially homeotropic alignment layer, i.e. the long axis of the liquid crystal molecules is substantially perpendicular to the surface of the alignment layer, such as the VA-mode.
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, haze in the transmitted state and haze state was measured by a WGT-S type haze meter, and absorption spectrum of a color light adjusting device was measured by a general uv-visible light spectrometer.
For convenience of expression, in the following examples, the group structures of the liquid crystal compositions are represented by codes listed in Table 1. The structures and codes of the chiral compounds used are also listed in table 2. The proportion of the liquid crystal composition is mass percent.
TABLE 1 liquid Crystal Compound group Structure code
Wherein, if n is "3", it is represented as alkyl-C 3 H 7 Or a spacer-C 3 H 6 -。
TABLE 2 code and Structure of chiral Compounds
Comparative example 1
The light adjusting device in this comparative example includes first and second transparent conductive base layers, two alignment layers, and a liquid crystal layer. Wherein the liquid crystal composition in the liquid crystal layer comprises a nematic liquid crystal compound and a chiral compound, no bimesogenic compound and no dye are used, and the specific formulation thereof is shown in table 3. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 25.6%, and the haze is 64.3%.
Table 3 liquid crystal composition formulation
Comparative example 2
The light adjusting device in this comparative example includes first and second transparent conductive base layers, two alignment layers, and a liquid crystal layer. Wherein the liquid crystal composition in the liquid crystal layer comprises a bimesogenic compound, a nematic liquid crystal compound and a chiral compound, and no dye is used, and the specific formulation thereof is shown in table 4. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 0.9%, and the haze is 90.4%.
Table 4 liquid crystal composition formulation
Example 1
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 5. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 1.2%, and the haze is 82.4%. Meanwhile, the absorption spectrum of the light modulation device in the transmission state and the fog state is measured, and as shown in fig. 5, the light modulation device has absorption at about 525nm, so that the light modulation device is red in the transmission state and the fog state.
Table 5 liquid crystal composition formulation
Example 2
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 6. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze was 1.2% and the haze was 89.7%. Meanwhile, the absorption spectrum of the light modulation device in the transmission state and the fog state is measured, and as shown in fig. 6, the light modulation device has a plurality of absorption at 550-650nm, so that the light modulation device is blue in the transmission state and the fog state.
Table 6 liquid crystal composition formulation
Example 3
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 7. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of VA type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 1.5%, and the haze is 89.4%.
Table 7 liquid crystal composition formulation
Example 4
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 8. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze was 1.6% and the haze was 84.2%.
Table 8 liquid crystal composition formulation
Example 5
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 9. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 0.58% and the haze is 80.5%.
Table 9 liquid crystal composition formulation
Example 6
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 10. The thickness of the liquid crystal layer is 5 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze was 0.9% and the haze was 65.2%.
Table 10 liquid crystal composition formulation
Example 7
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 11. The thickness of the liquid crystal layer is 9 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 1.7%, and the haze is 80.3%.
Table 11 liquid crystal composition formulation
Example 8
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 12. The thickness of the liquid crystal layer is 50 micrometers, the transparent conductive base layers are all glass/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 1.8%, and the haze is 89.0%.
Table 12 liquid crystal composition formulation
Example 9
The dimming device in this embodiment includes a first transparent conductive base layer, a second transparent conductive base layer, two alignment layers, and a liquid crystal layer. Wherein 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 formulation thereof is shown in Table 13. The thickness of the liquid crystal layer is 20 micrometers, the transparent conductive base layers are PET/ITO, and the alignment layers are of IPS type. Selecting proper voltage to drive the light modulation device to stable transmission state and fog state respectively, and measuring the fog degree, wherein the result is as follows: the transmission haze is 1.3%, and the haze is 86.5%.
Table 13 liquid crystal composition formulation
According to the embodiment and the comparative example, the color light modulation device can realize the transparent state and the fog state with stable zero electric field, has lower transparent state fog degree and higher fog state fog degree, and can realize the color bistable state, so that the aesthetic property is further improved on the basis of high light transmittance and privacy isolation.
Although a few exemplary embodiments have been described in detail above, the disclosed embodiments are illustrative only 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 this disclosure. Accordingly, all such modifications, adaptations and/or alternatives are intended to be included within the scope of the present disclosure as defined in the following claims.
Claims (9)
1. A color light modulating device comprising a first transparent conductive substrate, a liquid crystal layer, a second transparent conductive substrate, and a liquid crystal composition comprising a bimesogenic compound, a nematic liquid crystal compound, a chiral compound, and an oily dye, wherein the color light modulating device comprises two states of zero electric field stability: a transmitted state in which the transmitted light is substantially direct and a haze state in which the transmitted light is substantially scattered;
the double mesogenic compound comprises 14.49% of NPP7PPN, 14.49% of NPP9PPN and 14.49% of NPP11PPN, or 10.99% of NPP7PPN, 10.99% of NPP9PPN and 10.99% of NPP11PPN by mass percent;
the chemical formula of NPP7PPN is:
；
the chemical formula of NPP9PPN is:
；
the chemical formula of NPP11PPN is:
。
2. the color light modulation device according to claim 1, wherein the thickness of the liquid crystal layer is 2-60 μm.
3. The color dimming device of claim 1, the first transparent conductive base layer and the second transparent conductive base layer 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 light modulation device according to claim 3, wherein the transparent substrate is glass or a polymer material.
5. The color light modulation device according to claim 3, wherein the 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 light modulation device according to claim 6, wherein the alignment layer comprises a substantially planar alignment type and a substantially vertical alignment type.
8. The color light modulation device according to claim 1, wherein the oily dye is not 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% -50% by mass of the liquid crystal composition.
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| 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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| 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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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 |