WO2018228324A1 - 一种液晶显示器件及其应用 - Google Patents

一种液晶显示器件及其应用 Download PDF

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Publication number
WO2018228324A1
WO2018228324A1 PCT/CN2018/090614 CN2018090614W WO2018228324A1 WO 2018228324 A1 WO2018228324 A1 WO 2018228324A1 CN 2018090614 W CN2018090614 W CN 2018090614W WO 2018228324 A1 WO2018228324 A1 WO 2018228324A1
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Prior art keywords
liquid crystal
display device
crystal display
flexible conductive
layer
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PCT/CN2018/090614
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English (en)
French (fr)
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丁文全
祝春才
李鹏飞
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江苏和成显示科技有限公司
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Priority to EP18818662.1A priority Critical patent/EP3640719A4/en
Publication of WO2018228324A1 publication Critical patent/WO2018228324A1/zh

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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
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • 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
    • G02F1/1313—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 specially adapted for a particular application
    • 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
    • G02F1/132—Thermal activation of liquid crystals exhibiting a thermo-optic effect
    • 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
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • 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
    • 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
    • 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
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the invention belongs to the field of liquid crystal display, and particularly relates to a liquid crystal display device and its application in the field of electronic paper.
  • LCDs liquid crystal displays
  • Glass has many features that are suitable for LCD manufacturing.
  • the glass can be processed at high temperatures. It is rigid and relatively strong.
  • the glass is suitable for batch processing methods used in mass production.
  • the surface of the glass becomes extremely smooth and uniform over a wide range during processing, and the glass has the need.
  • Optical properties such as high transparency.
  • glass is far from the ideal substrate material.
  • the glass substrate does not become very flexible and not very strong, is not suitable for web manufacturing and is easily broken. Therefore, great efforts are being made all over the world to develop displays on a more flexible and sturdy substrate that is not only compatible with three-dimensional dispensing, but also that can be repeatedly flexed. It is desirable for the display to have the flexibility of a thin plastic sheet, paper or fabric such that it can hang, roll or fold like a paper or cloth.
  • Cholesteric liquid crystal materials are unique in their optical and electro-optical properties, primarily because they can accommodate Bragg reflected light of a particular wavelength and bandwidth. This feature is because these materials have a helical structure in which the liquid crystal director is twisted about the helical axis. The distance by which the director is rotated 360° is called the pitch and is represented by P.
  • the reflected light is circularly polarized in the same direction of rotation as the helical structure of the liquid crystal. If the incident light is not polarized, it can be broken down into two circularly polarized portions that have a relative direction of rotation and one of which is reflected.
  • the cholesteric material can be converted to either of two stable structures (planar or focal conic) by electricity, or if a suitable high electric field can be maintained, it can be converted to a vertical alignment state.
  • the helical axis In a planar structure, the helical axis is perpendicular to the substrate and Bragg reflected light in a specific wavelength range, while in the focal conic structure, the helical axis is generally parallel to the substrate and oriented so that the material is transparent to all wavelengths.
  • bistable structures are capable of power conversion between each other at a fast rate of approximately milliseconds.
  • gray scales can also be obtained because only a portion of the pixels can be converted into a reflective state, thereby controlling the intensity of the reflection.
  • the bistable cholesteric display technology was introduced in the early 1990s as a low power, daylight readable technology primarily for use on hand-held devices. Portable devices require long battery life and require the display to consume very little energy.
  • the cholesteric display is ideal for this application because the bistable feature avoids the need for supplemental energy and the high reflectivity avoids the need for energy consuming backlights. These combined features extend battery life from hours to months, which is superior to displays that do not have these features. Reflective displays are also easy to read in very bright daylight, and in this case, backlit displays are not effective. Due to the high reflective brightness of the cholesteric display and its extraordinary contrast, the biliary display can be easily read in dimly lit rooms.
  • the wide viewing angle provided by the cholesteric display allows several people to simultaneously see the displayed image from different locations.
  • an operation mode other than the bistable mode is possible by applying an electric field to dissociate the cholesteric material to form a transparent, vertical structure.
  • the electric field is rapidly removed to transform the material into a reflective planar structure.
  • the bistable cholesteric liquid crystal display has several important electronic driving features that are not available for other bistable reflection techniques. Of paramount importance for matrix displays with many pixels addressed is the characteristic of voltage thresholds. Voltage thresholds are essential for multiplexing row/column matrices without the need for expensive active matrices (transistors at each pixel). The bistable state with a voltage threshold allows the production of very high resolution displays with low cost passive matrix technology.
  • the cholesteric liquid crystal material is especially suitable for flexible substrates.
  • This cholesteric display has been introduced by Minolta and by Kent Displays, including two plastic substrates filled with cholesteric liquid crystal materials (Society for Information Display Proceedings, 1998, at pages 897-900 and 51-54, respectively). ). Although the substrate itself is flexible, the assembled display is less flexible because the two substrates are laminated together.
  • Minolta has developed a program for manufacturing a flexible display having two substrates, such as U.S. Patent No. 6,459,467.
  • cholesteric liquid crystals acts as a droplet dispersion that renders the material insensitive to pressure and shear so that images on the bistable cholesteric liquid crystal display are not easily removed by flexing the substrate.
  • Stephenson et al. of Kodak have fabricated a flexible bistable reflective display having a cholesteric liquid crystal polymer dispersion on a single transparent plastic substrate by using a photographic method (U.S. Patent Application No. US 20030203136 A1 and U.S. Patent No. US) No. 6788362B2).
  • This process includes a deposition sequence on a transparent polyester plastic whereby the final product is a display that is visible through the substrate.
  • This process requires a transparent substrate material such as a transparent plastic sheet.
  • Chinese Patent No. CN1993725A discloses a method of dispersing a cholesteric liquid crystal by glue on a cloth or paper, and a flexible, bendable, monochrome or color steady state flexible display device can be obtained.
  • the device switches the cholesteric liquid crystal into a planar state with a driving voltage of up to 100V or higher, and the driving voltage is relatively high, and switching to a focal conic state requires a driving method of slowly reducing the voltage, and the driving method is relatively complicated, so the current timidity
  • the application of phase liquid crystal display devices is limited and it is difficult to expand.
  • the manufacturing process of the cholesteric liquid crystal display device is complicated and costly, which further limits its use.
  • An object of the present invention is to provide a liquid crystal display device which has advantages of low driving voltage, flexible display, reusability, and the like, and is suitable for use in the field of electronic paper.
  • a liquid crystal display device comprising at least two flexible conductive layers, and a glue layer containing cholesteric liquid crystal sandwiched between the at least two flexible conductive layers, at least one of the at least two flexible conductive layers a transparent flexible conductive layer, when the at least two flexible conductive layers are all of the flexible transparent conductive layer, then any one of the flexible conductive layers is provided with a light absorbing layer on a side close to the glue layer, when there is only one layer
  • the flexible conductive layer is the transparent flexible conductive layer
  • the non-transparent flexible conductive layer is provided with a light absorbing layer on a side close to the glue layer.
  • the present invention is not limited to only having two flexible conductive layers.
  • two or more flexible conductive layers may be disposed, and if the devices in each region are configured and the present technology
  • the solution is identical, and such device configuration should also be included in the inventive concept of the present invention.
  • an insulating layer is disposed between the two flexible conductive layers.
  • a transparent protective coating may be provided on the uppermost layer of at least a portion of the liquid crystal display device as needed.
  • the thickness of the liquid crystal display device is between 30 and 200 ⁇ m, except for the transparent flexible conductive layer not provided with the light absorbing layer.
  • the transparent flexible conductive layer not provided with the light absorbing layer may be a transparent substrate (such as PET) coated with a conductive coating (such as a coating formed of conductive ITO, carbon nanotubes, silver nanowires, etc.) near the side of the glue layer. Membrane, etc.).
  • the light absorbing layer can absorb light in the visible range, preferably black with a background for fixed opaque light absorbing, the dark black background provides high contrast of the reflected color image of the liquid crystal display, but can also be used for gallbladder Other opaque colors of the fixed background of the ⁇ phase liquid crystal display.
  • the light absorbing layer may be separately disposed with an adjacent flexible conductive layer. If the dye is mixed with a heat curable or UV curable adhesive, the light absorbing layer is disposed in a coating manner, and then separately disposed on the light absorbing layer.
  • Conductive layer such as conductive silver, etc.
  • the black conductive adhesive may be used to achieve the purpose of absorbing light by the light absorbing layer, and also having a conductive conductive layer.
  • the cholesteric liquid crystal is encapsulated into a liquid crystal microcapsule by an organic transparent material or an inorganic transparent material, and the liquid crystal microcapsule has a particle diameter of 5-20 ⁇ m.
  • the organic transparent material is selected from one or more of polyurea, polymethacrylic resin (such as polymethyl methacrylate, PMMA) and polyethylene terephthalate.
  • the liquid crystal microcapsules can be produced by thermally induced phase separation, polymerization phase separation, lyotropic phase separation or emulsion dispersion.
  • the refractive index of the cholesteric liquid crystal is between 0.14-0.25, and the reflection effect is better; the clearing point of the cholesteric liquid crystal is between 50-90 ° C, and the effect of thermal phase transition is better.
  • the cholesteric liquid crystal of the present invention has a positive or negative dielectric constant, and can achieve the technical effects of the present invention.
  • the cholesteric liquid crystal has a reflection wavelength of between 400 and 650 nm. If the cholesteric liquid crystal is prepared into liquid crystal microcapsules, the liquid crystal microcapsules may have a single reflection wavelength, and cholesteric having different reflection wavelengths may also be selected. The liquid crystals are respectively prepared into liquid crystal microcapsules having different reflection wavelengths, and the liquid crystal microcapsules having different reflection wavelengths are mixed to form a mixed liquid crystal microcapsule.
  • the adhesive in the glue layer includes one or more heat curing or UV curing adhesives, preferably aqueous adhesives such as aqueous polyurethane, acrylic emulsion, bone cement, polyvinyl alcohol (PVA) and the like.
  • aqueous adhesives such as aqueous polyurethane, acrylic emulsion, bone cement, polyvinyl alcohol (PVA) and the like.
  • the insulating layer can also use UV curing or heat curing adhesive, but unlike the adhesive in the glue layer, the primary consideration of the glue layer is the bonding strength of the adhesive, and the insulating layer is the primary consideration. The factor is the degree of insulation.
  • the mass ratio of the cholesteric liquid crystal to the adhesive in the glue layer containing the cholesteric liquid crystal is 2:8-8:2. If the adhesive content is too high, the reflectivity of the obtained device is lowered, if the adhesive is sticky If the content of the agent is too low, the supporting force of the device for external stress is insufficient.
  • the present invention can produce one or more layers in the liquid crystal display device by screw printing, squeegee printing, screen printing.
  • the liquid crystal display device provided by the present invention can realize thermal printing within 120 ° C using a conventional thermal printer (such as a GK 888t type label printer), and the liquid crystal display device can display a printing effect in a curled manner, which can be used as a flexible and repeatedly used electronic paper.
  • a conventional thermal printer such as a GK 888t type label printer
  • the liquid crystal display device of the invention utilizes a cholesteric liquid crystal distributed in the glue layer, and is provided with a transparent flexible conductive layer and a light absorbing layer, so as to maintain the steady state characteristic of the cholesteric liquid crystal in a flexible state, thereby being flexible in the device.
  • the display state of the liquid crystal is changed to achieve a display effect of thermal printing when applied to electronic paper.
  • the liquid crystal display device of the present invention has a simple driving mode, reduces the high voltage driving or a driving method that requires a slow voltage reduction, and can complete the display pattern by using a common thermal printer.
  • the present invention can be flexibly used and is more convenient to carry.
  • the invention can be refreshed by electric driving, can realize repeated recycling, and is more economical and environmentally friendly.
  • FIG. 1 is a schematic structural view of a liquid crystal display device of Embodiment 1;
  • Embodiment 2 is a schematic structural view of a liquid crystal display device of Embodiment 2, Embodiment 4, and Embodiment 5;
  • Embodiment 3 is a schematic structural view of a liquid crystal display device in Embodiment 3;
  • FIG. 4 is a view showing a printing effect of the liquid crystal display device of the first embodiment through a GK 888t type label printer;
  • HPC850100-100, HSG07900-000, and HMT138600-100I001 described below are all trade names of liquid crystal products produced by Jiangsu Hecheng Display Technology Co., Ltd., which are commercially available.
  • the OCA optical adhesive was purchased from Shenzhen Dalton Electronic Materials Co., Ltd.
  • the coating machine uses the JFA-II type film coating machine produced by Shanghai Modern Environmental Engineering Technology Co., Ltd.
  • the conductive paste is a commercially available GRAPHIT33 type conductive paste.
  • a suitable optically active substance was added to HPC850100-100 to adjust it to a cholesteric phase reflection wavelength of about 546 nm, and 80 mL of dichloromethane previously dissolved with 1 g of PMMA prepolymer and 1 wt% of polymethacrylic acid (PMAA) were added.
  • PMAA polymethacrylic acid
  • Conductive PET-ITO with a thickness of 125 ⁇ m was selected as the first substrate, which was placed on the film coater and placed on the surface of the substrate with a thickness of 20 ⁇ m OCA optical glue (purchased from Shenzhen Total). Electronic Materials Co., Ltd., after drying at a high temperature of 100 ° C for 3 minutes, polymerized and cured under an illumination of 8 mW and a fluorescent lamp of 365 nm for 3 minutes. Then, a surface of the OCA optical adhesive was coated with a liquid crystal microcapsule solution of the above-prepared PVA having a thickness of 40 ⁇ m by a doctor blade printing technique, and dried at 40 ° C for 5 hours.
  • OCA optical glue purchased from Shenzhen Total
  • a 20 wt% aqueous solution of PVA mixed with a suitable black dye having a thickness of 10 ⁇ m was then applied to the film by a squeegee printing technique and dried at 40 ° C for 5 hours.
  • a liquid crystal display device of the present invention was prepared by further coating a conductive silver paste having a thickness of 10 ⁇ m by a screw printing technique and drying at 80 ° C for 0.5 hour.
  • the structure of the obtained liquid crystal display device is as shown in Fig. 1.
  • the device can be switched into a focal conic state by applying a voltage of 50V, and the green-green printing effect can be realized under the ordinary GK 888t type label printer (as shown in Fig. 4). Shown, the figure is the grayscale mode of the actual photo, where the gray area a represents the green word effect and the black area b represents the black background effect).
  • the reflectivity of the device was 25%
  • the contrast i.e., the ratio of the reflected intensity in the planar state to the reflected intensity in the focal conic state
  • the preparation method of the aqueous solution of the liquid crystal microcapsules in this embodiment is basically the same as that of the embodiment 1, except that the liquid crystal in the embodiment 1 is replaced with HSG07900-000, and the cholesteric phase reflection wavelength is replaced by about 625 nm. Then, the prepared aqueous solution of the liquid crystal microcapsules and the 20 wt% aqueous solution of the bone glue were uniformly mixed at a volume ratio of 4:6, and used.
  • Conductive PET-ITO with thickness of 75 ⁇ m was selected as the first substrate, which was placed on the film coater and placed on the surface of the substrate with a thickness of 20 ⁇ m OCA optical glue at a temperature of 100 °C. After drying for 3 minutes, it was polymerized and cured under an illumination of 8 mW and a fluorescent lamp of 365 nm for 3 minutes. Then, a surface of the OCA optical adhesive was coated with a layer of a 40 ⁇ m thick solution of the bone marrow-mixed liquid crystal microcapsules prepared by a doctor blade technique, and dried at 40 ° C for 5 hours. Then, a black conductive paste having a thickness of 20 ⁇ m was coated on the film by a squeegee printing technique, and dried at 50 ° C for 0.5 hour to prepare a liquid crystal display device of the present invention.
  • the structure of the obtained liquid crystal display device is as shown in FIG. 2, and the device can be switched into a focal conic state by applying a voltage of 80 V, and the printing effect of the red text on the black background can be realized under the ordinary GK 888t type label printer.
  • the device Using a DMS 505, the device has a reflectivity of 20% and a contrast ratio of 2. The device is bendable and reusable.
  • HMT138600-100I001 and 33wt% aqueous polyurethane solution were mixed at a volume ratio of 6:4, stirred at a stirring rate of 1000 rpm for 5 minutes, and then defoamed to obtain a suspension emulsion. Under the microscope, liquid crystal particles having a particle diameter of about 15 ⁇ m were dispersed. In waterborne polyurethane, spare.
  • Conductive PET-ITO with a thickness of 188 ⁇ m was selected as the first substrate, which was placed on the film coater and placed on the surface of the substrate by a screw printing technique. The surface of the substrate was coated with a thickness of 30 ⁇ m. The liquid crystal emulsion was dried at 80 ° C for 5 hours. Then, a black conductive paste having a thickness of 20 ⁇ m was coated on the film by a squeegee printing technique, and dried at 50 ° C for 0.5 hour to prepare a liquid crystal display device of the present invention.
  • the structure of the obtained liquid crystal display device is as shown in FIG. 3, and the device can be switched into a focal conic state by applying a voltage of 60V, and the yellow-green word printing effect can be realized under the ordinary GK 888t type label printer.
  • the device Using a DMS 505, the device has a reflectivity of 25% and a contrast ratio of 2. The device is bendable and reusable.
  • the preparation method of the aqueous solution of the liquid crystal microcapsules in this embodiment was basically the same as that of Example 1, except that the liquid crystal in Example 1 was replaced with HSG07900-000, and the prepolymer was replaced with polyisobutyl methacrylate. Then, the prepared aqueous solution of the liquid crystal microcapsules and the 20 wt% aqueous solution of the bone glue were uniformly mixed at a volume ratio of 4:6, and used.
  • Conductive PET-ITO with thickness of 75 ⁇ m was selected as the first substrate, which was placed on the film coater and placed on the surface of the substrate with a thickness of 20 ⁇ m OCA optical glue at a temperature of 100 °C. After drying for 3 minutes, it was polymerized and cured under an illumination of 8 mW and a fluorescent lamp of 365 nm for 3 minutes. Then, a surface of the OCA optical adhesive was coated with a layer of a liquid crystal microcapsule solution prepared by the above-mentioned bone glue having a thickness of 30 ⁇ m by a doctor blade printing technique, and dried at 40 ° C for 5 hours. Then, a black conductive paste having a thickness of 20 ⁇ m was coated on the film by a squeegee printing technique, and dried at 50 ° C for 0.5 hour to prepare a liquid crystal display device of the present invention.
  • the structure of the obtained liquid crystal display device is as shown in FIG. 2, and the device can be switched to a planar state (in green) by applying a voltage of 40 V, and the green-black printing effect can be realized under the ordinary GK 888t type label printer.
  • the device Using a DMS 505, the device has a reflectance of 20% and a contrast ratio of 2. The device is bendable and reusable.
  • Appropriate optically active substances were added to HSG07900-000 to adjust them to cholesteric phase reflection wavelengths of 480 nm, 546 nm, and 625 nm, and 3 batches of 80 mL of dichloromethane pre-dissolved with 1 g of PMMA prepolymer were mixed with 1 wt%. After mixing 400 mL of aqueous solution of methacrylic acid (PMAA), 20 g of the above-mentioned cholesteric liquid crystals having different reflection wavelengths were respectively added, and the emulsion was uniformly mixed to form an emulsion, and then dichloromethane was removed by solvent evaporation to obtain different reflections having a diameter of about 10 ⁇ m.
  • PMAA methacrylic acid
  • An aqueous solution of a liquid crystal microcapsule of a wavelength, the aqueous solution of the three liquid crystal microcapsules having different reflection wavelengths is uniformly mixed at a mass ratio of 3:3:3 to obtain an aqueous solution of the mixed liquid crystal microcapsule, and then the prepared mixed liquid crystal microcapsule
  • the aqueous solution was uniformly mixed with 20% by weight of the bone cement aqueous solution at a volume ratio of 4:6, and was used.
  • Conductive PET-ITO with a thickness of 188 ⁇ m was selected as the first substrate, which was placed on the coating machine and placed on the surface of the substrate by a screw printing technique.
  • the surface of the substrate was coated with a 20 ⁇ m thick OCA optical adhesive at a high temperature of 100 °C. After drying for 3 minutes, it was polymerized and cured under an illumination of 8 mW and a fluorescent lamp of 365 nm for 3 minutes. Then, a surface of the OCA optical adhesive was coated with a layer of 40 ⁇ m thick mixed bone marrow mixed liquid crystal microcapsule solution, and dried at 40 ° C for 5 hours. Then, a black conductive paste having a thickness of 20 ⁇ m was coated on the film by a squeegee printing technique, and dried at 50 ° C for 0.5 hour to prepare a liquid crystal display device of the present invention.
  • the structure of the obtained liquid crystal display device is as shown in FIG. 2, and the device can be switched into a planar state (black) by applying a voltage of 50V, and the white-white printing effect can be realized under the ordinary GK 888t type label printer.
  • the device Using a DMS 505, the device has a reflectance of 20% and a contrast ratio of 2. The device is bendable and reusable.
  • the liquid crystal display device of the invention utilizes a cholesteric liquid crystal distributed in the glue layer, and is provided with a transparent flexible conductive layer and a light absorbing layer, so as to maintain the steady state characteristic of the cholesteric liquid crystal in a flexible state, thereby being flexible in the device.
  • the display state of the liquid crystal is changed to achieve a display effect of thermal printing when applied to electronic paper.
  • the liquid crystal display device of the present invention has a simple driving mode, reduces the high voltage driving or a driving method that requires a slow voltage reduction, and can complete the display pattern by using a common thermal printer.
  • the present invention can be flexibly used and is more convenient to carry.
  • the invention can be refreshed by electric driving, can realize repeated recycling, and is more economical and environmentally friendly.
  • liquid crystal composition according to the present invention can be applied to the field of liquid crystals.

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Abstract

一种液晶显示器件及其应用，液晶显示器件含有至少两层柔性导电层，以及夹持于至少两层柔性导电层之间的含有胆甾相液晶的胶水层，至少两层柔性导电层中至少一层为透明柔性导电层，当至少两层柔性导电层均为透明柔性导电层时，则其中任一层柔性导电层在靠近所述胶水层一侧设有吸光层（4），当仅有一层柔性导电层为透明柔性导电层时，则其中非透明柔性导电层在靠近所述胶水层一侧设有吸光层（4）。液晶显示器件具有驱动电压低、柔性显示、可重复使用等优点，适用于电子纸领域。

Description

一种液晶显示器件及其应用 技术领域
本发明属于液晶显示领域，具体涉及到一种液晶显示器件及其在电子纸领域的应用。
背景技术
20世纪70年代早期，随着液晶显示器(Liquid Crystal Display，LCD)的发明，信息显示技术开始了一场革命。因为LCD为轻质、低功率的平板显示器，它所提供的可视读出功能符合手提式电子设备的小型尺寸、轻便重量和电池的要求，所以此显示技术使得新类别的手提式和其他便携式产品大量出现。商业上，LCD首先作为手表上的数字读出器而广泛应用，接着在仪器中采用，后来在手提式计算机、个人数据助理和很多其他数字设备中得到应用。今天，LCD技术在电视机和个人计算机(Personal Computer，PC)领域中已几乎取代阴极射线管。
现今所制造并销售的几乎所有商用LCD显示器都是位于玻璃基底上的。玻璃具有很多适用于LCD制造的特征。玻璃可在高温下进行加工，它为刚性且较为坚固，玻璃适用于大量制造中所使用的批量加工方法，在加工中玻璃的表面在大范围内变得极为光滑且均匀，且玻璃具有所需要的光学特性，例如高透明性。然而，在许多应用中，玻璃远非理想的基底材料。玻璃基底并不能变得非常地有柔性且不是很坚固，不适用于网络制造(web manufacturing)且容易破损。因此全世界都在作出很大努力以便在更具柔性且坚固的基底上研制显示器，其不仅可与三维配制一致，而且还可重复挠曲。希望显示器具有薄塑料片、纸张或织物的柔性，使得其可像纸张或布那样悬垂、卷起或折叠。
胆甾相液晶材料在它们的光学和电子光学特征方面都很独特，主要在于它们可以适应特定波长和带宽的Bragg反射光。具有此特征是因为这些材料具有螺旋状结构，其中液晶指向矢绕螺旋轴扭曲。将指向矢旋转360°的距离称为节距且由P表示。胆甾相液晶的反射带以波长λ o＝0.5(n e+n o)P为中心且具有Δλ＝(n e-n o)P的带宽，其通常约为100nm，其中n e和n o分别为液晶的非寻常和寻常折射率。反射光以与液晶的螺旋结构相同的旋向发生圆偏振。如果入射光未发生偏振，那么可将其分解为两个圆偏振部分，它们具有相对旋向且其中之一被反射。可将胆甾相材料以电力转换为两个稳定结构(平面态或焦锥态)中的任一者，或如果合适的高电场能够得以维持，可将其转换为垂直配向状态。在平面态结构中，螺旋轴垂直于基底及特定波长范围内的Bragg反射光，而在焦锥态结构中，一般来说，螺旋轴平行于基底而且定向，以使得材料对所有波长皆是透明的，但弱光散射排除在外，其在邻近黑暗背景上可忽略不计。这些双稳态结构能够以大约毫秒的快速速率在彼此之间进行电力转换。同时，还可获得灰度等级，原因在于只有一部分像素可转换为反射状态，由此控制反射强度。
双稳态胆甾反射型显示器技术在20世纪90年代早期作为主要用于手提式装置上的低功率、日光可读技术而引入。便携式装置需要较长的电池寿命，要求显示器消耗很少的能量。胆甾显示器对此应用来说较理想，因为双稳态特征避免了对补充能量的需要，且高反射率避免了对消耗能量的背光灯的需要。这些组合特征可将电池寿命从小时延长到月，相比于不具有这些特征的显示器更优越。反射型显示器在非常明亮的日光下也易于被读取，而在此状况下，背光式显示器无效。由于胆甾型显示器的高反射亮度和其非凡的对比度，胆甾型显示器可在灯光昏暗的房间中容易地读取。由胆甾型显示器提供的宽视角允许几个人从不同位置同时看见显示图像。在使用拥有正介电各向异性的胆甾相材料的情况下，通过施加电场以使胆甾相材料解开而形成透明、垂直结构，除双稳态模式之外的操作模式皆为可能。迅速移除所述电场使材料转变成反射平面结构。这种现代胆甾型显示器的更基本的方面公开于(例如)美国专利第5437811号和第5453863号中。
双稳态胆甾相液晶显示器具有为其他双稳态反射技术所不具有的若干重要的电子驱动特征。对定址具有很多像素的矩阵显示器来说极其重要的是电压阈值的特征。对于多路复用行/列矩阵而无需昂贵的有源矩阵(每个像素处的晶体管)来说，电压阈值必不可少。具有电压阈值的双稳态性允许以低成本的无源矩阵技术来生产分辨率非常高的显示器。
胆甾相液晶材料尤其适用于柔性基底。这种胆甾型显示器已经由Minolta公司且由Kent Displays公司所介绍，包括以胆甾相液晶材料填充的两种塑料基底(Society for Information Display Proceedings，1998，分别在897-900和51-54页)。虽然基底本身为柔性，但由于两个基底层压在一起，因此经组装的显示器柔性较小。Minolta已经开发用于制造具有两个基底的柔性显示器的程序，如参加美国专利第6459467号。
如果仅使用一个基底且将显示材料涂覆或印刷在基底上，那么可获得更大的柔性。通过使胆甾相液晶形成为聚合物微滴分散体而使其适用于标准涂覆和印刷技术。胆甾相液晶作为微滴分散体，使材料对压力和剪切不敏感，以使得双稳态胆甾相液晶显示器上的图像不容易通过挠曲基底而清除。最近，Kodak的Stephenson等人通过使用摄影方法在单个透明塑料基底上制造了具有胆甾相液晶聚合物分散体的柔性双稳态反射型显示器(美国公开申请案第US 20030203136A1号和美国专利第US 6788362B2号)。此过程包括在透明聚酯塑料上的沉积序列，藉此最终产品为通过基底可看到图像的显示器。这种过程需要透明的基底材料，例如透明塑料薄片。
中国专利CN1993725A公开了一种在布或纸张上通过胶水分散胆甾相液晶的方式，可以得到柔性可弯曲、单色或者彩色的稳态型柔性显示器件。但是该器件将胆甾相液晶切换成平面态的驱动电压高达100V以上，驱动电压比较高，而切换成焦锥态又需要一个缓慢降低电压的驱动方式，驱动方式比较复杂，因此目前的胆甾相液晶显示器件的应用受到限制，很难扩展开。此外，该胆甾相液晶显示器件制作过程比较复杂，成本高，进一步限制了其使用。
综上，对于稳态特性胆甾相液晶需要发明出一种驱动方式简单、制作工艺容易的柔性胆甾相液晶显示器件。
发明内容
发明目的：本发明的目的是提供一种液晶显示器件，其具有驱动电压低、柔性显示、可重复使用等优点，适用于电子纸领域。
本发明的技术方案：
一种液晶显示器件，含有至少两层柔性导电层，以及夹持于所述至少两层柔性导电层之间的含有胆甾相液晶的胶水层，所述至少两层柔性导电层中至少一层为透明柔性导电层，当所述至少两层柔性导电层均为所述柔性透明导电层时，则其中任一层柔性导电层在靠近所述胶水层一侧设有吸光层，当仅有一层柔性导电层为所述透明柔性导电层时，则其中非透明柔性导电层在靠近所述胶水层一侧设有吸光层。
需要说明的是，本发明不限于只含有两层柔性导电层，例如为了实现液晶显示面板的多区域显示，可以设置两层以上的柔性导电层，而如果各区域内的器件构成与本发明技术方案一致，那么这样的器件构成应当也纳入本发明的发明构思内。
进一步的，为了防止器件短路现象的发生，在两层柔性导电层之间设置绝缘层。
当然根据需要，也可在所述液晶显示器件的至少一部分的最上层设置透明保护涂层。
为了实现更好的热打印效果，除不设有吸光层的透明柔性导电层之外，所述液晶显示器件的厚度在30-200μm之间。
不设有所述吸光层的透明柔性导电层可以选用在靠近胶水层一侧覆盖有导电涂层(如导电ITO、碳纳米管、银纳米线等形成的涂层)的透明基材(如PET膜等)。
所述吸光层可在可见光范围内吸收光线，优选具有用于固定的不透明的吸收光的背景的黑色，暗黑色的背景提供了液晶显示器的反射颜色图像的高对比度，但也可以使用用于胆甾相液晶显示器的固定背景的其他不透明颜色。所述吸光层可与相邻的柔性导电层单独设置，如可选用染料与可热固化或UV固化的胶黏剂混合后以涂层的方式实现吸光层的设置，再在吸光层上单独设置导电层(如导电银等)，也可将吸光层和相邻的柔性导电层合并成一层设置，如可选用黑色导电胶，即可实现吸光层吸收光线的目的，也具有柔性导电层导电的功能。
所述胆甾相液晶由有机透明材料或者无机透明材料封装成液晶微胶囊，所述液晶微胶 囊粒径为5-20μm。
所述有机透明材料选自聚脲、聚甲基丙烯酸树脂(如聚甲基丙烯酸甲酯，PMMA)和聚对苯二甲酸乙二醇酯中的一种或者更多种。
所述液晶微胶囊可选用热致相分离、聚合相分离、溶致相分离或乳液分散的方式进行制作。
所述胆甾相液晶的折射率在0.14-0.25之间，反射效果更佳；所述胆甾相液晶的清亮点在50-90℃之间，热相变的效果更佳。
本发明的胆甾相液晶的介电常数为正或负皆可，均能实现本发明的技术效果。
所述胆甾相液晶的反射波长在400-650nm之间，若将胆甾相液晶制备成液晶微胶囊，则所述液晶微胶囊可以具有单一反射波长，也可以选用具有不同反射波长的胆甾相液晶分别制备成具有不同反射波长的液晶微胶囊，再将该具有不同反射波长的液晶微胶囊混合形成混合液晶微胶囊。
所述胶水层中的胶黏剂包括一种或者更多种热固化或者UV固化的胶黏剂，优选水性胶黏剂，如水性聚氨酯、丙烯酸树脂乳液、骨胶、聚乙烯醇(PVA)等。
所述绝缘层同样可使用UV固化或者热固化的胶黏剂，但与胶水层中胶黏剂不同的是，胶水层首要考虑的因素为胶黏剂的粘结强度，而绝缘层首要考虑的因素为绝缘度。
含有胆甾相液晶的胶水层中胆甾相液晶与胶黏剂的质量比为2:8-8:2，若胶黏剂含量过高，则制得的器件反射率会降低，若胶黏剂含量过低，则该器件对外应力的支撑力不足。
本发明可采用丝杠印刷、刮板印刷、丝网印刷制作所述液晶显示器件中的的一层或者更多层。
本发明提供的液晶显示器件可使用普通热打印机(如GK 888t型标签打印机)在120℃以内实现热打印，该液晶显示器件可呈卷曲状显示打印效果，其可作为柔性反复使用的电子纸。
有益效果：
本发明的液晶显示器件利用胆甾相液晶分布于胶水层中，配以透明柔性导电层和吸光层的设置，可以保持胆甾相液晶在柔性状态下的稳态特性，从而在器件呈柔性的基础上，利用液晶热相变的方式改变液晶的显示状态，以达到在应用于电子纸中时可实现热打印的 显示效果。
与传统的胆甾相液晶显示器件相比，本发明的液晶显示器件驱动方式简单，减少了高压驱动或者需要缓慢降低电压的驱动方式，使用常见的热打印机即可完成显示图案。
与传统的以玻璃为基板的显示器件相比，本发明可以柔性使用，携带更方便。
与传统的纸张或者一次性打印显示器件相比，本发明可以通过电驱动的方式刷新，可实现反复循环使用，更加经济环保。
附图说明
图1为实施例1中液晶显示器件的结构示意图；
图2为实施例2、实施例4、实施例5中液晶显示器件的结构示意图；
图3为实施例3中液晶显示器件的结构示意图；
图4为实施例1中液晶显示器件经GK 888t型标签打印机打印效果图；
其中，1、透明柔性导电层；2、绝缘层；3、液晶微胶囊层；3-1、胶黏剂；3-2、液晶微胶囊；4、吸光层；5、导电层；6、导电吸光层；a代表绿字效果；b代表黑底效果。
具体实施方式
以下将结合具体实施方案来说明本发明。需要说明的是，下面的实施例为本发明的示例，仅用来说明本发明，而不用来限制本发明。在不偏离本发明主旨或范围的情况下，可进行本发明构思内的其他组合和各种改良。
下文所述HPC850100-100、HSG07900-000、HMT138600-100I001均为江苏和成显示科技股份有限公司生产的液晶产品的商品名，均可从市面购得。所述OCA光学胶购自深圳道尔顿电子材料有限公司。所述涂膜机选用上海现代环境工程技术有限公司生产的JFA-II型涂膜机。所述导电胶为市售GRAPHIT33型导电胶。
下文所述丝杠印刷、刮板印刷、丝网印刷等技术均为本领域技术人员普遍知晓的涂覆技术，下文不再展开描述。
实施例1
向HPC850100-100中加入适当旋光物质以将其调整至胆甾相反射波长为546nm左右，将预先溶有1g PMMA预聚物的80mL二氯甲烷与掺有1wt％聚甲基丙烯酸(PMAA)的400mL水溶液混合后，加入20g胆甾相液晶，混合均匀形成乳液后，采用溶剂蒸发法除去二氯甲烷，得到含有直径10μm左右的液晶微胶囊的水溶液(其中含有约50wt％的液晶微 胶囊)。然后将制得的液晶微胶囊的水溶液与20wt％的PVA水溶液按体积比1:1混合均匀，备用。
选取125μm厚度的导电PET-ITO为第一基材，将其置于涂膜机上平整放置，采用丝杠印刷技术在基材表面涂覆一层厚度为20μm的OCA光学胶(采购自深圳道达尔电子材料有限公司)，在100℃的高温下干燥3分钟后，在8mW照度、365nm荧光灯下聚合固化3分钟。然后采用刮板印刷技术在OCA光学胶表面涂覆一层厚度为40μm的上述制得的混有PVA的液晶微胶囊溶液，在40℃下干燥5小时。然后在此膜上采用刮板印刷技术涂覆一层厚度为10μm的混有适当黑色染料的20wt％PVA水溶液，在40℃的下干燥5小时。最后通过丝杠印刷技术再涂覆一层厚度为10μm的导电银浆，在80℃下干燥0.5小时，即可制备得到本发明的液晶显示器件。
制得的液晶显示器件结构如图1所示，该器件可通过施加50V的电压切换成焦锥态，在普通GK 888t型标签打印机下即可实现黑底绿字的打印效果(如图4所示，该图为实际照片的灰度模式，其中灰色区域a代表的是绿字效果，黑色区域b代表的是黑底效果)。利用DMS 505测得该器件的反射率为25％，对比度(即平面态的反射强度与焦锥态的反射强度的比值)为3，该器件可弯曲且可反复使用。
实施例2
本实施例中液晶微胶囊的水溶液的制备方法基本同实施例1，不同之处在于：将实施例1中的液晶替换成HSG07900-000，胆甾相反射波长替换为625nm左右。然后将制得的液晶微胶囊的水溶液与20wt％的骨胶水溶液按体积比4:6混合均匀，备用。
选取75μm厚度的导电PET-ITO为第一基材，将其置于涂膜机上平整放置，采用丝杠印刷技术在基材表面涂覆一层厚度为20μm的OCA光学胶，在100℃的高温下干燥3分钟后，在8mW照度、365nm荧光灯下聚合固化3分钟。然后采用刮板印刷技术在OCA光学胶表面涂覆一层厚度为40μm的上述制得的混有骨胶的液晶微胶囊溶液，在40℃下干燥5小时。然后在此膜上采用刮板印刷技术涂覆一层厚度为20μm的黑色导电胶，在50℃下干燥0.5小时，即可制备得到本发明的液晶显示器件。
制得的液晶显示器件结构如图2所示，该器件可通过施加80V的电压切换成焦锥态，在普通GK 888t型标签打印机下即可实现黑底红字的打印效果。利用DMS 505测得该器件的反射率为20％，对比度为2，该器件可弯曲且可反复使用。
实施例3
将HMT138600-100I001与33wt％的水性聚氨酯溶液按体积比6:4混合后，在1000rmp的搅拌速率下搅拌5分钟后，脱泡，得到悬浮乳液，显微镜下可见粒径为15μm左右的液 晶颗粒分散于水性聚氨酯中，备用。
选取188μm厚度的导电PET-ITO为第一基材，将其置于涂膜机上平整放置，采用丝杠印刷技术在基材表面涂覆一层厚度为30μm的上述制得的混有水性聚氨酯的液晶乳液，在80℃下干燥5小时。然后在此膜上采用刮板印刷技术涂覆一层厚度为20μm的黑色导电胶，在50℃下干燥0.5小时，即可制备得到本发明的液晶显示器件。
制得的液晶显示器件结构如图3所示，该器件可通过施加60V的电压切换成焦锥态，在普通GK 888t型标签打印机下即可实现黑底黄绿字的打印效果。利用DMS 505测得该器件的反射率为25％，对比度为2，该器件可弯曲且可反复使用。
实施例4
本实施例中液晶微胶囊的水溶液的制备方法基本同实施例1，不同之处在于：将实施例1中的液晶替换成HSG07900-000，将预聚物替换成聚甲基丙烯酸异丁酯。然后将制得的液晶微胶囊的水溶液与20wt％的骨胶水溶液按体积比4:6混合均匀，备用。
选取75μm厚度的导电PET-ITO为第一基材，将其置于涂膜机上平整放置，采用丝杠印刷技术在基材表面涂覆一层厚度为20μm的OCA光学胶，在100℃的高温下干燥3分钟后，在8mW照度、365nm荧光灯下聚合固化3分钟。然后采用刮板印刷技术在OCA光学胶表面涂覆一层厚度为30μm的上述制得的混有骨胶的液晶微胶囊溶液，在40℃下干燥5小时。然后在此膜上采用刮板印刷技术涂覆一层厚度为20μm的黑色导电胶，在50℃下干燥0.5小时，即可制备得到本发明的液晶显示器件。
制得的液晶显示器件结构如图2所示，该器件可通过施加40V的电压切换成平面态(呈绿色)，在普通GK 888t型标签打印机下即可实现绿底黑字的打印效果。利用DMS 505测得该器件的反射比率为20％，对比度为2，该器件可弯曲且可反复使用。
实施例5
分别向HSG07900-000中加入适当旋光物质以将其调整至胆甾相反射波长为480nm、546nm、625nm左右，将3批预先溶有1g PMMA预聚物的80mL二氯甲烷与掺有1wt％聚甲基丙烯酸(PMAA)的400mL水溶液混合后，分别加入20g上述具有不同反射波长的胆甾相液晶，混合均匀形成乳液后，采用溶剂蒸发法除去二氯甲烷，分别得到含有直径10μm左右具有不同反射波长的液晶微胶囊的水溶液，将这三种具有不同反射波长的液晶微胶囊的水溶液按质量比3:3:3混合均匀，得到混合液晶微胶囊的水溶液，然后将制得的混合液晶微胶囊的水溶液与20wt％的骨胶水溶液按体积比4:6混合均匀，备用。
选取188μm厚度的导电PET-ITO为第一基材，将其置于涂膜机上平整放置，采用丝 杠印刷技术在基材表面涂覆一层厚度为20μm的OCA光学胶，在100℃的高温下干燥3分钟后，在8mW照度、365nm荧光灯下聚合固化3分钟。然后采用刮板印刷技术在OCA光学胶表面涂覆一层厚度为40μm的上述制得的混有骨胶的混合液晶微胶囊溶液，在40℃下干燥5小时。然后在此膜上采用刮板印刷技术涂覆一层厚度为20μm的黑色导电胶，在50℃下干燥0.5小时，即可制备得到本发明的液晶显示器件。
制得的液晶显示器件结构如图2所示，该器件可通过施加50V的电压切换成平面态(呈黑色)，在普通GK 888t型标签打印机下即可实现黑底白字的打印效果。利用DMS 505测得该器件的反射比率为20％，对比度为2，该器件可弯曲且可反复使用。
本发明的液晶显示器件利用胆甾相液晶分布于胶水层中，配以透明柔性导电层和吸光层的设置，可以保持胆甾相液晶在柔性状态下的稳态特性，从而在器件呈柔性的基础上，利用液晶热相变的方式改变液晶的显示状态，以达到在应用于电子纸中时可实现热打印的显示效果。与传统的胆甾相液晶显示器件相比，本发明的液晶显示器件驱动方式简单，减少了高压驱动或者需要缓慢降低电压的驱动方式，使用常见的热打印机即可完成显示图案。与传统的以玻璃为基板的显示器件相比，本发明可以柔性使用，携带更方便。与传统的纸张或者一次性打印显示器件相比，本发明可以通过电驱动的方式刷新，可实现反复循环使用，更加经济环保。
本发明还可以由其他多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性
本发明所涉及的液晶组合物可以应用于液晶领域。

Claims (17)

  1. 一种液晶显示器件，其特征在于，所述液晶显示器件含有至少两层柔性导电层，以及夹持于所述至少两层柔性导电层之间的含有胆甾相液晶的胶水层，所述至少两层柔性导电层中至少一层为透明柔性导电层，当所述至少两层柔性导电层均为透明柔性导电层时，则其中任一层柔性导电层在靠近所述胶水层一侧设有吸光层，当仅有一层柔性导电层为透明柔性导电层时，则其中非透明柔性导电层在靠近所述胶水层一侧设有吸光层。
  2. 根据权利要求1所述的液晶显示器件，其特征在于，在所述至少两层柔性导电层之间设置有绝缘层。
  3. 根据权利要求1所述的液晶显示器件，其特征在于，所述液晶显示器件的最外层的至少一部分可设有透明保护涂层。
  4. 根据权利要求1所述的液晶显示器件，其特征在于，当不包括不设有吸光层的透明柔性导电层的厚度时，所述液晶显示器件的厚度在30-200μm之间。
  5. 根据权利要求1所述的液晶显示器件，其特征在于，不设有所述吸光层的透明柔性导电层为在靠近胶水层一侧覆盖有导电涂层的透明基材。
  6. 根据权利要求1-5任一项所述的液晶显示器件，其特征在于，所述吸光层可在可见光范围内吸收光线，其可与相邻的柔性导电层单独设置，也可将吸光层和相邻的柔性导电层合并成一层设置。
  7. 根据权利要求1所述的液晶显示器件，其特征在于，所述胆甾相液晶由有机透明材料或者无机透明材料封装成液晶微胶囊，所述液晶微胶囊的直径为5-20μm。
  8. 根据权利要求7所述的液晶显示器件，其特征在于，所述有机透明材料选自聚脲、聚甲基丙烯酸树脂和聚对苯二甲酸乙二醇酯中的一种或者更多种。
  9. 根据权利要求7所述的液晶显示器件，其特征在于，所述液晶微胶囊可选用热致相分离、聚合相分离、溶致相分离或乳液分散的方式进行制作。
  10. 根据权利要求1所述的液晶显示器件，其特征在于，所述胆甾相液晶的折射率在0.14-0.25之间；所述胆甾相液晶的清亮点在50-90℃之间。
  11. 根据权利要求1所述的液晶显示器件，其特征在于，所述胆甾相液晶的介电常数为正或负。
  12. 根据权利要求1所述的液晶显示器件，其特征在于，所述胆甾相液晶的反射波长在400-650nm之间。
  13. 根据权利要求7所述的液晶显示器件，其特征在于，所述液晶微胶囊的反射波长在400-650nm之间，且所述液晶微胶囊可以由具有单一反射波长的液晶微胶囊构成，也可以由具有不同反射波长的液晶微胶囊混合而成。
  14. 根据权利要求2所述的液晶显示器件，其特征在于，所述胶水层中的胶黏剂与所述绝缘层中的胶黏剂相同或不同，其中所述胶黏剂包括一种或者更多种热固化或者UV固化的胶黏剂。
  15. 根据权利要求1所述的液晶显示器件，其特征在于，所述含有胆甾相液晶的胶水层中所述胆甾相液晶与胶黏剂的质量比为2:8-8:2。
  16. 根据权利要求1所述的液晶显示器件，其特征在于，可采用丝杠印刷、刮板印刷、丝网印刷制作所述液晶显示器件中的一层或者更多层。
  17. 如权利要求1-16中任一项所述的液晶显示器件在制作电子纸中的应用。
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CN115097662A (zh) * 2022-06-15 2022-09-23 深圳歌德新创科技有限公司 柔性液晶显示膜材及其制备方法、柔性显示器
CN115097662B (zh) * 2022-06-15 2024-05-24 深圳歌德新创科技有限公司 柔性液晶显示膜材及其制备方法、柔性显示器

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