CN112433403A - Light modulation device - Google Patents
Light modulation device Download PDFInfo
- Publication number
- CN112433403A CN112433403A CN202011268829.1A CN202011268829A CN112433403A CN 112433403 A CN112433403 A CN 112433403A CN 202011268829 A CN202011268829 A CN 202011268829A CN 112433403 A CN112433403 A CN 112433403A
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- China
- Prior art keywords
- liquid crystal
- modulation device
- crystal layer
- light modulation
- light
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/60—Pleochroic dyes
- C09K19/601—Azoic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/60—Pleochroic dyes
- C09K19/603—Anthroquinonic
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention provides an optical modulation device, including: a first transparent electrode layer, a liquid crystal layer, a second transparent electrode layer; wherein the liquid crystal layer comprises at least one nematic liquid crystal, at least one chiral compound and at least one dye compound. The light modulation device of the invention has the characteristics of high transmittance in a transmission state, low transmittance in a dark state and high contrast in the transmission state.
Description
Technical Field
The invention relates to an electric control light modulation device which is characterized in that a liquid crystal layer at least composed of liquid crystal, dye and chiral compound has two states of transparent state and dark state under the action of an electric field.
Background
Electrochromism is a phenomenon that the optical properties (reflectivity, transmittance, absorptivity and the like) of a material generate stable and reversible color change under the action of an external electric field, and the electrochromism is represented as reversible change of color and transparency in appearance. Materials having electrochromic properties are referred to as electrochromic materials, and devices made with electrochromic materials are referred to as electrochromic devices.
The electrochromic material is typically applied to electrochromic intelligent glass, and the intelligent glass has adjustability of light absorption and transmission under the action of an electric field, and plays a role in changing the illumination degree of natural light or specific wavelength and an electronic curtain.
The dye-doped liquid crystal material has the characteristics of high response speed, color diversity, voltage driving mode, high stability, long service life and the like, and is widely concerned. However, the current light modulation device using the dye-doped liquid crystal material has the problems of insufficient transmittance in a transmission state, higher transmittance in a dark state or lower contrast in a transmission state.
Disclosure of Invention
The invention aims to solve the problems of insufficient transmittance in a transmission state, high transmittance in a dark state or low contrast in a transmission state of a light modulation device using a dye-doped liquid crystal material at present, and provides an electric control light modulation device with high transmittance in the transmission state, low transmittance in the dark state or high contrast in the transmission state.
The technical scheme provided by the invention is as follows:
the present invention provides an optical modulation device, including:
a first transparent electrode layer;
a liquid crystal layer containing at least a nematic liquid crystal, a dye compound and a chiral compound;
a second transparent electrode layer, the liquid crystal layer being between the first transparent electrode layer and the second electrode transparent layer;
the light modulation device does not include an alignment layer having an alignment effect on nematic liquid crystal in the liquid crystal layer and being in direct contact with the liquid crystal layer.
Preferably, the transparent electrode layer material includes ITO (indium tin oxide), silver nanomaterial, graphene, or conductive polymer material; the substrate material of the transparent electrode can be selected from glass, PET, transparent polyimide and the like.
Further, the liquid crystal layer comprises nematic liquid crystal, and the phase state of the nematic liquid crystal in the temperature interval of 10-40 ℃ is nematic.
Further, the nematic liquid crystal comprises one or a mixture of 5CB, 7CB, E7, E8, ZLI4792 and the like.
Further, at least one of the dye compounds included in the liquid crystal layer is a dye compound exhibiting dichroism to visible light.
Further, the thickness of the liquid crystal layer ranges from 1 μm to 30 μm, preferably from 3 μm to 25 μm, and more preferably from 3 μm to 20 μm.
Further, the liquid crystal layer includes a dye compound in a ratio of 0.1% to 15% by weight, preferably 0.5% to 10% by weight, based on the total weight of the liquid crystal layer.
Further, the liquid crystal layer contains chiral compounds having a molecular weight of 1500 or less, and the ratio of the weight of the chiral compounds contained to the total weight of the liquid crystal layer is in the range of 0.1% to 20%, preferably 0.5% to 15%.
Further, the chiral compound is added to nematic liquid crystal to form cholesteric liquid crystal. Preferably, the chiral compound comprises S811, CB15, R1011, S5011.
The invention has the beneficial effects that:
the invention uses the liquid crystal compound, the chiral compound and the dichroic dye to compound a liquid crystal layer, leads the nematic liquid crystal to form the chiral agent of the cholesteric phase through the doped chiral compound, and reasonably matches all components, and adopts the design of the non-oriented layer to lead the light modulation device to have the characteristics of high transmittance of the transparent state, low transmittance of the dark state and high contrast of the transparent state.
Detailed Description
The invention will be further illustrated with reference to specific examples, to which the present invention is not at all restricted.
The conductive material of the transparent electrode is selected from other conductive polymer materials such as ITO (indium tin oxide), silver nano material, graphene and the like, and preferably ITO. The substrate material can be selected from glass, PET, transparent polyimide and the like.
The nematic liquid crystal in the liquid crystal layer can be selected from commercial products or synthesized by self, such as one or a mixture of more of 5CB, 7CB, E7, E8, ZLI4792 and the like.
The chiral compound can be selected from commercial products or synthesized by self, such as S811, CB15, R1011, S5011 and the like.
The dichroic dye is a dye having a significant difference in absorption coefficient for polarized light in two polarization directions orthogonal to each other, and may be selected from a dichroic black dye, a dichroic blue dye, a dichroic red dye, a dichroic yellow dye, or a mixture of these dyes. Preferred dyes are azo, anthraquinone or other suitable dichroic dyes.
Example 1
Preparation of light modulation device:
1. nematic liquid crystal E7 was mixed with chiral compound S5011 in a ratio of 98.5:1.5 to form mixture M.
2. The mixture M is mixed with 1%, 3%, 5% black dichroic dye to form the mixtures MD1, MD3, MD 5.
3. Cleaning the ITO film-plated glass substrate once by using a detergent and warm water, removing particle dust and impurities of the glass substrate, cleaning by using an acetone solution, coating the frame glue mixed with spacers on the periphery of one glass substrate, combining the other glass substrate with the glass substrate coated with the frame glue, and baking at a high temperature of 130 ℃ for 1 hour.
4. The mixture MD1, MD3, and MD5 was filled between two glass substrates having different parameters, and a light modulation device capable of adjusting the visible light transmittance was obtained.
Comparative example 1
Preparation of a light modulation device comprising an alignment layer:
1. the nematic liquid crystal E7 was mixed with 1%, 3%, and 5% of black dichroic dye to form mixtures E7D1, E7D3, and E7D 5.
2. Cleaning the ITO film-plated glass substrate once by using a detergent and warm water, removing particle dust and impurities of the glass substrate, cleaning by using an acetone solution, spin-coating a layer of polyimide orientation agent on the ITO film-plated glass substrate, curing at a high temperature of 200 ℃ for 2 hours, coating frame glue mixed with spacers on the periphery of one polyimide orientation agent-coated glass substrate, combining the other polyimide orientation agent-coated glass substrate with the frame glue-coated glass substrate, and baking at a high temperature of 130 ℃ for 1 hour.
3. The mixtures E7D1, E7D3, and E7D5 were filled between two glass substrates having different parameters, to obtain a light modulation device capable of adjusting the visible light transmittance.
Example 2
Performance testing of example 1 and comparative example 1
And testing the transmittance of the light modulation device under different parameters by using a light transmittance tester (model: LH-206).
And (3) testing conditions are as follows:
temperature: 25 deg.C
Test wavelength range: visible light
Voltage (frequency): 60V (50 Hz);
the test results are shown in table 1:
TABLE 1 light modulation device parameters and transmittance test data for each specification
As can be seen from table 1, the design of the non-oriented layer can effectively improve the transmittance and contrast of the transparent state and the dark state, and the doping of the chiral compound can also effectively improve the transmittance and contrast of the transparent state and reduce the transmittance of the dark state. The scheme provided by the invention has better transparent state and dark state performances and obviously high contrast, and is suitable for liquid crystal display devices.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. A light modulation device, comprising:
a first transparent electrode layer;
a liquid crystal layer containing at least a nematic liquid crystal, a dye compound and a chiral compound;
a second transparent electrode layer, the liquid crystal layer being between the first transparent electrode layer and the second electrode transparent layer.
2. The light modulation device according to claim 1, wherein the liquid crystal layer contains nematic liquid crystal whose phase state is nematic in a temperature range of 10 ℃ to 40 ℃.
3. The light modulation device according to claim 1, wherein at least one of the dye compounds contained in the liquid crystal layer is a dye compound exhibiting dichroism with respect to visible light.
4. A light modulation device according to claim 1, wherein the liquid crystal layer has a thickness in a range of 1 μm to 30 μm.
5. The light modulating device of claim 4, wherein the liquid crystal layer has a thickness in a range of 3 μm to 25 μm.
6. A light modulation device according to claim 1 wherein the liquid crystal layer comprises the dye compound in a proportion ranging from 0.1% to 15% by weight based on the total weight of the liquid crystal layer.
7. A light modulation device according to claim 6 wherein the liquid crystal layer comprises the dye compound in a proportion ranging from 0.5% to 10% by weight relative to the total weight of the liquid crystal layer.
8. The chiral compound of claim 1, wherein said chiral compound is added to a nematic liquid crystal to form a cholesteric liquid crystal.
9. The light modulation device according to claim 1, wherein the liquid crystal layer contains a chiral compound having a molecular weight of 1500 or less.
10. Use of a light modulation device according to any of claims 1-9 in liquid crystal displays, electronic curtains, light-regulating windows, automotive light-regulating glasses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011268829.1A CN112433403A (en) | 2020-11-13 | 2020-11-13 | Light modulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011268829.1A CN112433403A (en) | 2020-11-13 | 2020-11-13 | Light modulation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112433403A true CN112433403A (en) | 2021-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011268829.1A Pending CN112433403A (en) | 2020-11-13 | 2020-11-13 | Light modulation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236933A (en) * | 2021-12-31 | 2022-03-25 | 上海智精实光机电科技有限公司 | Optical attenuation sheet based on liquid crystal mixture and preparation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040031672A1 (en) * | 2002-08-15 | 2004-02-19 | Wen Jing Wu | Liquid crystal color switch and method of manufacture |
| CN1641426A (en) * | 2004-01-15 | 2005-07-20 | 夏普株式会社 | Display element and display device |
| CN101393361A (en) * | 2007-09-18 | 2009-03-25 | 富士胶片株式会社 | Liquid crystal device |
| CN105259679A (en) * | 2015-09-11 | 2016-01-20 | 京东方科技集团股份有限公司 | Electronic control dimming film, preparation method thereof, and display device |
| CN107085327A (en) * | 2017-06-16 | 2017-08-22 | 北京大学 | A kind of electric-controlled light-regulating film based on liquid crystal and two tropism dyestuffs and preparation method thereof |
| CN111443543A (en) * | 2020-04-30 | 2020-07-24 | Tcl华星光电技术有限公司 | Liquid crystal display panel and brightness control method of liquid crystal display panel |
-
2020
- 2020-11-13 CN CN202011268829.1A patent/CN112433403A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040031672A1 (en) * | 2002-08-15 | 2004-02-19 | Wen Jing Wu | Liquid crystal color switch and method of manufacture |
| CN1641426A (en) * | 2004-01-15 | 2005-07-20 | 夏普株式会社 | Display element and display device |
| CN101393361A (en) * | 2007-09-18 | 2009-03-25 | 富士胶片株式会社 | Liquid crystal device |
| CN105259679A (en) * | 2015-09-11 | 2016-01-20 | 京东方科技集团股份有限公司 | Electronic control dimming film, preparation method thereof, and display device |
| CN107085327A (en) * | 2017-06-16 | 2017-08-22 | 北京大学 | A kind of electric-controlled light-regulating film based on liquid crystal and two tropism dyestuffs and preparation method thereof |
| CN111443543A (en) * | 2020-04-30 | 2020-07-24 | Tcl华星光电技术有限公司 | Liquid crystal display panel and brightness control method of liquid crystal display panel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236933A (en) * | 2021-12-31 | 2022-03-25 | 上海智精实光机电科技有限公司 | Optical attenuation sheet based on liquid crystal mixture and preparation method |
| CN116243525A (en) * | 2021-12-31 | 2023-06-09 | 上海智精实光机电科技有限公司 | Optical attenuation sheet based on liquid crystal mixture and preparation method thereof |
| CN116243525B (en) * | 2021-12-31 | 2023-11-03 | 上海智精实光机电科技有限公司 | Optical attenuation sheet based on liquid crystal mixture and preparation method thereof |
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