CN106842753B - Blue phase liquid crystal device and manufacturing method thereof - Google Patents
Blue phase liquid crystal device and manufacturing method thereof Download PDFInfo
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- CN106842753B CN106842753B CN201710134454.1A CN201710134454A CN106842753B CN 106842753 B CN106842753 B CN 106842753B CN 201710134454 A CN201710134454 A CN 201710134454A CN 106842753 B CN106842753 B CN 106842753B
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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
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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
- G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
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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
- G02F1/13775—Polymer-stabilized liquid crystal layers
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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
- G02F1/13793—Blue phases
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a blue phase liquid crystal device and a manufacturing method thereof, and relates to the technical field of liquid crystal display. The blue phase liquid crystal device comprises an upper substrate, a lower substrate, a blue phase liquid crystal layer and an electrode layer, wherein the electrode layer comprises a pixel electrode and a common electrode, the pixel electrode and the common electrode are arranged at intervals, the blue phase liquid crystal layer covers the electrode layer, the lower substrate is positioned below the electrode layer, and the upper substrate is positioned above the blue phase liquid crystal layer. The polymer stabilized blue phase liquid crystal precursor material consists of parent liquid crystal, a chiral agent, a monomer, a cross-linking agent and a photoinitiator. The invention can effectively reduce the driving voltage of the blue phase liquid crystal device, has simple method and is suitable for large-scale popularization.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a blue phase liquid crystal device and a manufacturing method for reducing driving voltage of the blue phase liquid crystal device.
Background
In recent years, blue phase liquid crystals have a series of advantages in the fields of displays, phase modulators and photonics compared to conventional liquid crystal materials: the color field sequential display has sub-millisecond response time, so that the color break phenomenon in color field sequential display can be eliminated; the molecular self-assembly structure of the liquid crystal display device enables the structure of the device to be free of an alignment layer, so that a friction process is omitted, and the preparation process of the liquid crystal device is simplified; the display device has perfect black state due to optical isotropy without external electric field, and has no problem of viewing angle without compensation film.
Although the temperature range of the stable existence of the blue phase liquid crystal in a natural state is only 1-2 ℃, the temperature range of the stable blue phase liquid crystal is widened to be more than 60K by a method of curing misorientation in a polymer network. However, polymer stabilized blue phase liquid crystals still face many technical challenges in practical applications, such as: the problems of excessive driving voltage, hysteresis effect, residual birefringence and the like, although the narrow stability temperature width of the blue phase liquid crystal has been widened to be over 60K by curing the disclination lines in the polymer network, the polymer stabilization method brings other problems, such as high driving voltage, hysteresis effect, residual birefringence and the like, which limit the wide application of the blue phase liquid crystal.
Therefore, those skilled in the art have made an effort to develop a blue phase liquid crystal device and a method for manufacturing the same to reduce the driving voltage of the blue phase liquid crystal device from two dimensions of material characteristics and device structure, so as to further improve the photoelectric properties of the polymer stabilized blue phase liquid crystal.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to effectively reduce the driving voltage of a blue phase liquid crystal device.
In order to achieve the above object, the present invention provides a blue phase liquid crystal device, which includes an upper substrate, a lower substrate, a blue phase liquid crystal layer and an electrode layer, wherein the electrode layer includes a pixel electrode and a common electrode, the pixel electrode and the common electrode are arranged at an interval, the blue phase liquid crystal layer covers the electrode layer, the lower substrate is located below the electrode layer, and the upper substrate is located above the blue phase liquid crystal layer.
Further, the upper substrate and the lower substrate are glass or plastic.
Further, the electrode layer is a transparent conductive metal oxide or a transparent conductive organic polymer material.
Further, the transparent conductive metal oxide is ITO, and the transparent conductive organic polymer material is PEDOT.
Furthermore, the electrode layer is structured as a group of strip electrodes or upper and lower electrodes which are parallel to each other.
Further, the resistivity of the parent liquid crystal material of the blue phase liquid crystal layer is more than 1.0 x 1010Ω·m。
Further, the leakage current of the mother liquid crystal material of the blue phase liquid crystal layer is lower than 0.60 muA/cm2。
The invention also provides a manufacturing method of the blue phase liquid crystal device, which comprises the following steps:
and 4, obtaining the blue phase liquid crystal device with low driving voltage and stable polymer.
Further, the ion concentration of the mother liquid crystal is such that the self leak current thereof does not exceed 0.60 μ A/cm2。
Further, in step 2, the cooling rate is 0.5 ℃/min.
The invention achieves the purpose of improving the Kerr constant of the blue phase liquid crystal by improving the resistivity of the blue phase liquid crystal, reduces the driving voltage of the blue phase liquid crystal and does not influence other parameters of the blue phase liquid crystal device.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a cross-sectional view of a liquid crystal cell structure according to a preferred embodiment of the invention.
Detailed Description
As shown in fig. 1, the blue phase liquid crystal device according to the present invention includes an upper substrate 4, a lower substrate 1, a blue phase liquid crystal layer 3 and an electrode layer 2, wherein the electrode layer 2 includes a pixel electrode and a common electrode, the pixel electrode and the common electrode are arranged at an interval, the blue phase liquid crystal layer 3 covers the electrode layer 2, the lower substrate 1 is located below the electrode layer 2, and the upper substrate 4 is located above the blue phase liquid crystal layer 3.
The upper substrate and the lower substrate are made of glass or plastic. The electrode layer is made of transparent conductive metal oxide or transparent conductive organic high polymer material. The transparent conductive metal oxide is ITO, and the transparent conductive organic high polymer material is PEDOT. The electrode layer is a group of strip electrodes or upper and lower electrodes which are parallel to each other. The resistivity of the mother liquid crystal material of the blue phase liquid crystal layer is more than 1.0 x 1010Omega.m. The leakage current of the mother liquid crystal material of the blue phase liquid crystal layer is lower than 0.60 muA/cm2。
The invention also provides a manufacturing method of the blue phase liquid crystal device, which comprises the following steps:
and 4, obtaining the blue phase liquid crystal device with low driving voltage and stable polymer.
The ion concentration of the mother liquid crystal is such that the leakage current thereof is not more than 0.60 muA/cm2。
In step 2, the rate of cooling is 0.5 ℃/min.
The invention achieves the purpose of improving the Kerr constant of the blue phase liquid crystal by improving the resistivity of the blue phase liquid crystal, reduces the driving voltage of the blue phase liquid crystal and does not influence other parameters of the blue phase liquid crystal device.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. A blue phase liquid crystal device is characterized by comprising an upper substrate, a lower substrate, a blue phase liquid crystal layer and an electrode layer, wherein the electrode layer comprises a pixel electrode and a public electrode, the pixel electrode and the public electrode are arranged at intervals, the blue phase liquid crystal layer covers the electrode layer, the lower substrate is positioned below the electrode layer, and the upper substrate is positioned above the blue phase liquid crystal layer;
increasing the resistivity of polymer stabilized blue phase liquid crystalline prepolymers to above 1.0 x 10 by reducing the ionic concentration of the parent liquid crystal10 Omega · m, so as to improve the Kerr constant of the blue phase liquid crystal, reduce the driving voltage of the blue phase liquid crystal and simultaneously not influence other parameters of the blue phase liquid crystal device;
the leakage current of the mother liquid crystal material of the blue phase liquid crystal layer is lower than 0.60 muA/cm2。
2. The blue phase liquid crystal device according to claim 1, wherein the upper substrate and the lower substrate are glass or plastic.
3. The blue phase liquid crystal device according to claim 1, wherein said electrode layer is a transparent conductive metal oxide or a transparent conductive organic polymer material.
4. The blue phase liquid crystal device according to claim 3, wherein said transparent conductive metal oxide is ITO and said transparent conductive organic polymer material is PEDOT.
5. The blue phase liquid crystal device according to claim 1, wherein said electrode layer is structured as a set of strip electrodes or upper and lower electrodes parallel to each other.
6. A manufacturing method of a blue phase liquid crystal device is characterized by comprising the following steps:
step 1, increasing the resistivity of polymer stabilized blue phase liquid crystal precursor to more than 1.0 x 10 by reducing the ion concentration of the parent liquid crystal10 Ω·m；
Step 2, pouring the blue phase liquid crystal precursor polymer with high resistivity into a liquid crystal box, and cooling to the polymerization temperature;
step 3, polymerizing under ultraviolet rays;
and 4, obtaining the blue phase liquid crystal device with low driving voltage and stable polymer.
7. The method of manufacturing a blue phase liquid crystal device according to claim 6, wherein said mother liquid crystal has an ion concentration such that a self leakage current thereof does not exceed 0.60 μ A/cm2。
8. The method of claim 6, wherein in step 2, the cooling rate is 0.5 ℃/min.
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| CN201710134454.1A CN106842753B (en) | 2017-03-08 | 2017-03-08 | Blue phase liquid crystal device and manufacturing method thereof |
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| CN201710134454.1A CN106842753B (en) | 2017-03-08 | 2017-03-08 | Blue phase liquid crystal device and manufacturing method thereof |
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| CN106842753B true CN106842753B (en) | 2020-11-10 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007308534A (en) * | 2006-05-16 | 2007-11-29 | Asahi Glass Co Ltd | Liquid crystal/polymer composite |
| CN102443402A (en) * | 2011-10-27 | 2012-05-09 | 北京科技大学 | Preparation method for wide-temperature blue-phase liquid crystal composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090063761A (en) * | 2007-12-14 | 2009-06-18 | 삼성전자주식회사 | Display device |
| CN110908203A (en) * | 2009-10-16 | 2020-03-24 | 株式会社半导体能源研究所 | Display device |
| US9562191B2 (en) * | 2015-04-01 | 2017-02-07 | Citizen Finedevice Co., Ltd. | Compositions and methods for removing ions from liquid crystal materials |
| CN105093765A (en) * | 2015-08-26 | 2015-11-25 | 上海交通大学 | Method for electric control of polymerization process of polymer stabilized blue phase liquid crystal and device thereof |
| CN105425496A (en) * | 2016-01-06 | 2016-03-23 | 上海交通大学 | Blue phase liquid crystal phase modulator and polarization non-independent method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007308534A (en) * | 2006-05-16 | 2007-11-29 | Asahi Glass Co Ltd | Liquid crystal/polymer composite |
| CN102443402A (en) * | 2011-10-27 | 2012-05-09 | 北京科技大学 | Preparation method for wide-temperature blue-phase liquid crystal composite material |
Non-Patent Citations (1)
| Title |
|---|
| 聚合物稳定类型液晶用单体研究进展;李江伟等;《液晶与显示》;20160331;第31卷(第3期);全文 * |
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