WO2021179850A1 - 微胶囊、电子墨水、电子墨水屏、显示方法以及显示装置 - Google Patents

微胶囊、电子墨水、电子墨水屏、显示方法以及显示装置 Download PDF

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WO2021179850A1
WO2021179850A1 PCT/CN2021/074761 CN2021074761W WO2021179850A1 WO 2021179850 A1 WO2021179850 A1 WO 2021179850A1 CN 2021074761 W CN2021074761 W CN 2021074761W WO 2021179850 A1 WO2021179850 A1 WO 2021179850A1
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Prior art keywords
display
filler
magnetic field
electronic ink
microcapsule
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PCT/CN2021/074761
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English (en)
French (fr)
Inventor
余世荣
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纳晶科技股份有限公司
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Publication of WO2021179850A1 publication Critical patent/WO2021179850A1/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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/16757—Microcapsules
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/1673—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by magnetophoresis
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell

Definitions

  • This application relates to the field of display technology, in particular to microcapsules, electronic ink, electronic ink screens, display methods and display devices.
  • the electronic ink screen is the screen that uses electronic ink, and this technology is also called electronic paper display technology.
  • the electronic ink screen has a wide range of applications, ranging from commercialized e-books to electronic price tags.
  • Electronic price tag also called electronic shelf label, is an electronic display device with the function of sending and receiving information.
  • Each electronic price tag is connected to the computer database of the shopping mall through a wired or wireless network, and the latest product information is displayed on the electronic price tag.
  • the display shows the advantages of simple operation, easy reading, saving paper and human resources.
  • the electronic ink screens that are widely used are mainly black and white screens. Realizing the colorization of electronic ink screens is the development direction of electronic ink screens.
  • An object of the present application is to provide a microcapsule that can be used for display and an electronic ink including the microcapsule.
  • Another object of the present application is to provide an electronic ink screen that can be used for partial color display or full-color display and a display device including the electronic ink screen.
  • a microcapsule including a capsule shell layer defining a capsule containing cavity, a first end of the capsule containing cavity filled with a first filler, and the capsule containing cavity away from the The second end of the first end is filled with a second filler, the first filler has magnetism, the second filler does not have magnetism or the magnetism is weaker than the first filler, and the material of the second filler includes a photoluminescent material ,
  • the capsule shell layer can transmit light;
  • the first filler does not emit light, and the second filler emits light;
  • the first filler and the second filler emit light of different colors.
  • the particle size of the microcapsules is 50 ⁇ m to 500 ⁇ m
  • the particle size of the particles in the first filler is 100 nm to 1 ⁇ m
  • the particle size of the particles in the second filler is 1 nm to 100 nm.
  • the material of the first filler includes ferromagnetic material or ferrimagnetic material.
  • the material of the second filler includes a quantum dot material.
  • a barrier layer is provided between the first end and the second end of the capsule containing cavity, and the barrier layer isolates the first end from the second end.
  • an electronic ink including a solvent and a plurality of microcapsules dispersed in the solvent, the microcapsules being any one of the aforementioned microcapsules.
  • an electronic ink screen including a plurality of display units, each of the display units includes at least one ink accommodating cavity, and the display side of each ink accommodating cavity is light-transmissive, and the ink accommodating The cavity is filled with the aforementioned electronic ink of this application, and the display unit further includes a first magnetic field generating device and a second magnetic field generating device; the first magnetic field generating device controllably generates a first magnetic field on the display side of the display unit , So that the first end of the microcapsule contained in the display unit is turned to the display side under the action of the first magnetic field, and the second end is away from the display side; the second The magnetic field generating device controllably generates a second magnetic field on the other side of the display unit away from the display side, so that the first end of the microcapsule contained in the display unit acts on the second magnetic field Farther away from the display side, and the second end turns to the display side.
  • each of the display units is arranged in an array, and each of the ink containing cavities in each of the display units is arranged in an array, and the display units are opaque.
  • the inner wall of the ink containing cavity includes a top wall, a bottom wall, and a side wall surrounding the periphery.
  • the top wall is light-transmissive
  • the side wall is opaque
  • the first magnetic field generating device is provided on the Above the top wall, the area where the first magnetic field generating device is opposite to the top wall transmits light, and the second magnetic field generating device is arranged below the bottom wall.
  • a display method including the following steps:
  • An electronic ink screen which has a plurality of display units, each display unit includes at least one ink accommodating cavity, the display side of each ink accommodating cavity is light-transmissive, and each ink accommodating cavity is filled with the aforementioned electronic ink;
  • a first magnetic field is generated on the display side of the display unit that does not require display, and the first magnetic field causes the first end of the microcapsule contained in the display unit to face the display side, and The second end is far away from the display side;
  • a second magnetic field is generated on the other side of the display unit to be displayed away from the display side, and the second magnetic field makes the first end of the microcapsule contained in the display unit away from the Display side, the second end faces the display side;
  • the incident light is irradiated into each of the ink containing chambers from the display side, and the second filler in the second end facing the display side emits light under the excitation of the incident light, and faces all the ink accommodating chambers on the display side.
  • the first filler in the first end does not emit light or emits light of a different color from the second filler.
  • a display device including the electronic ink screen and a control system described in the foregoing application, the control system and the first magnetic field generating device and the second magnetic field generating device of each of the display units
  • the electrical connection is used to control the generation of the first magnetic field and the second magnetic field.
  • the display device is applied to an electronic price tag, and the display device further includes an excitation light source, and the excitation light source is used to excite the electronic ink of the electronic ink screen to emit light.
  • the display device further includes an excitation light source.
  • the microcapsule of the present application can change its display effect in a specific direction by applying magnetic fields in different directions, and the microcapsule can be used for display.
  • the electronic ink of the present application disperses microcapsules in a solvent, so that the microcapsules can rotate freely in the solvent under the action of a magnetic field, so that the oriented arrangement of the microcapsules can be better realized.
  • the display color of the electronic ink screen of the present application can be customized according to needs, by rationally selecting the first filler and the second filler in the microcapsules.
  • Figure 1 is a schematic diagram of an embodiment of the microcapsule of the present application.
  • Figure 2 is a schematic diagram of another embodiment of the microcapsule of the present application.
  • FIG. 3 is a schematic diagram of an embodiment of the electronic ink of this application.
  • FIG. 5 is a schematic diagram of an embodiment of the display unit of the electronic ink screen of the application, showing the state in which the second magnetic field generating device generates the second magnetic field;
  • FIG. 6 is a schematic longitudinal cross-sectional view of a part of the electronic ink screen of this application, showing a state in which each first magnetic field generating device and each second magnetic field generating device are not turned on;
  • FIG. 7 is a schematic longitudinal cross-sectional view of a part of the electronic ink screen of the application, in which the second magnetic field generating device of the ink containing cavity that needs to be displayed generates the second magnetic field, and the first magnetic field generating device of the ink containing cavity that does not need to be displayed generates the first magnetic field. magnetic field;
  • Figure 8 shows an application scenario of the display device of the present application
  • Microcapsule 11. Capsule shell layer; 110. Capsule containing cavity; 111, first end; 112, second end; 12, first filler; 13, second filler; 14, barrier layer;
  • orientation words such as the terms “center”, “horizontal”, “longitudinal”, “length”, “width”, “thickness”, “upper”, “lower” , “Front”, “Back”, “Left”, “Right”, “Vertical”, “Horizontal”, “Top”, “Bottom”, “Inner”, “Outer”, “Clockwise”, “Counterclockwise”
  • orientation words such as the terms “center”, “horizontal”, “longitudinal”, “length”, “width”, “thickness”, “upper”, “lower” , “Front”, “Back”, “Left”, “Right”, “Vertical”, “Horizontal”, “Top”, “Bottom”, “Inner”, “Outer”, “Clockwise”, “Counterclockwise”
  • the indication orientation and position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of narrating the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation
  • the present application provides a microcapsule 1, as shown in FIG. 1, comprising a capsule shell layer 11, the capsule shell layer 11 defines a capsule accommodating cavity 110, the first end 111 of the capsule accommodating cavity 110 is filled with a first filler 12, and the capsule accommodating cavity 110 The second end 112 away from the first end 111 is filled with the second filler 13.
  • the first filler 12 is magnetic, and the second filler 13 has no magnetism or is weaker than the first filler 12. Therefore, when the microcapsule 1 is in a magnetic field, the force of the first end 111 of the microcapsule 1 by the magnetic field is greater than that of the second end 112 , So that the first end 111 of the microcapsule 1 tends to turn to the direction of the magnetic field and moves along the direction of the magnetic field.
  • the material of the second filler 13 includes a photoluminescent material.
  • the capsule shell 11 can transmit light, thereby allowing light to pass through the capsule shell 11 to irradiate the second filler 13, and also allow the light emitted by the second filler 13 to pass through the capsule shell 11.
  • the first filler 12 does not emit light, the second filler 13 emits light, or the first filler 12 and the second filler 13 emit light of different colors.
  • the material of the first filler 13 may or may not be a photoluminescent material.
  • the first filler 12 includes one or more magnetic materials
  • the second filler 13 includes one or more photoluminescent materials, which is not limited in this application.
  • the microcapsule 1 provided in the present application can realize the directional arrangement under the action of an external magnetic field, so that the first end 111 and the second end 112 of the microcapsule 1 face a specific direction; in addition, the response of the two ends of the microcapsule 1 to the excitation light Therefore, in this application, by applying different magnetic fields, the display effect of the microcapsule 1 in a specific direction can be changed.
  • the particle size of the microcapsule 1 is 50 ⁇ m to 500 ⁇ m.
  • the particle size of the microcapsules is considered comprehensively with the volume of the capsule containing cavity.
  • the particle size of the microcapsule refers to the maximum length or average length of the object.
  • the particle size of each microcapsule 1 may be different or the same.
  • the deviation of the particle size of each microcapsule 1 is within 20% or within 10%.
  • the shape of the microcapsule 1 may be a sphere or a sphere-like body or other symmetrical shapes at both ends.
  • the particle diameter of the particles in the first filler 12 is 100 nm to 1 ⁇ m.
  • the particle size of the particles in the second filler 13 ranges from 1 nm to 100 nm. In some embodiments, the filling rate of the entire first filler 12 and the second filler 13 in the microcapsule 1 is greater than or equal to 50%, or greater than or equal to 60%, or greater than or equal to 70%, or greater than or equal to 80%, or greater than or equal to 90%.
  • a barrier layer 14 is provided between the first end 111 and the second end 112 of the capsule containing cavity 110.
  • the barrier layer 14 makes the first end 111 and the second end of the microcapsule containing cavity 110 The two ends 112 are isolated from each other.
  • the barrier layer 14 can prevent the first filler 12 from mixing with the second filler 13.
  • the material of the first filler 12 includes ferromagnetic material or ferrimagnetic material, such as neodymium iron boron magnet, ferrite magnet, ferroferric oxide, sendust, etc.
  • ferromagnetic material or ferrimagnetic material such as neodymium iron boron magnet, ferrite magnet, ferroferric oxide, sendust, etc.
  • the second filler 13 includes a quantum dot material.
  • Quantum dot materials have the advantages of narrow emission half-peak width and adjustable emission peaks. Using quantum dot materials as luminescent materials can realize color display.
  • the quantum dot material can be a binary or multiple II-VI semiconductor material, a binary or multiple III-V semiconductor material, and the like.
  • the quantum dot material can be a core quantum dot or a core-shell quantum dot.
  • the quantum dot material can be alloyed or non-alloyed, and can include or exclude doped elements.
  • the quantum dot material may not be graphene quantum dots or carbon quantum dots or perovskite quantum dots.
  • the structure of the microcapsule 1 of the present application is similar to the Janus (double-sided god) structure, and its preparation method can adopt the existing preparation method of the Janus particle structure, such as microfluidic technology, interfacial polymerization or spray drying.
  • the present application also provides an electronic ink, which includes a solvent 2 and a plurality of microcapsules 1 dispersed in the solvent 2, as shown in FIG. 3. Dispersing the microcapsules 1 in the solvent 2 can ensure that the microcapsules 1 can rotate freely under the action of an external magnetic field, which is more conducive to realizing the directional arrangement of a plurality of microcapsules 1.
  • solvent 2 needs to consider the material of the capsule shell 11.
  • the solvent 2 needs to disperse the microcapsule 1 well, but does not dissolve the microcapsule 1.
  • Solvent 2 preferably also has the characteristics of high boiling point, low viscosity, high light transmittance, high stability, no peculiar smell, and environmental friendliness.
  • Solvent 2 may be olefins, alkanes, ethers, and the like. Specifically, solvent 2 may be octadecene.
  • the present application also provides an electronic ink screen 3, which includes a plurality of display units 300, each display unit 300 includes at least one ink accommodating cavity 30, the display side of the ink accommodating cavity 30 is transparent, and the ink accommodating cavity 30 is filled with the application The aforementioned electronic ink.
  • the display unit 300 also includes a first magnetic field generating device 31 and a second magnetic field generating device 32; the first magnetic field generating device 31 controllably generates a first magnetic field on the display side of the display unit 300, thereby containing the microcapsules in the display unit 300
  • the first end 111 of 1 turns to the display side under the action of the first magnetic field, and the second end 112 is away from the display side;
  • the second magnetic field generating device 32 controllably generates a second magnetic field on the other side of the display unit 300 away from the display side, Therefore, the first end 111 of the microcapsule 1 contained in the display unit 300 is away from the display side under the action of the second magnetic field, and the second end 112 is turned to the display side.
  • the display side of the ink containing chamber 30 and the display side of the display unit 300 are the same side.
  • FIG. 4 is an example of displaying an embodiment of the electronic ink screen 3, in which the display unit 300a emits light for display, and the display unit 300b does not emit light or emits light of different colors, thereby forming a color contrast with the display unit 300a for display.
  • the second magnetic field generating device 32 of the display unit 300a is controlled to generate a second magnetic field so that the second end 112 of the microcapsule 1 faces the display side.
  • the excitation light entering the ink containing cavity 30 from the display side can excite the second end 112
  • the first magnetic field generating device 31 of the display unit 300b is controlled to generate a first magnetic field so that the first end 111 of the microcapsule 1 faces the display side.
  • the first filler 12 and the first filler 12 in the end 111 do not emit light or emit light of a different color from the second filler 13.
  • the electronic ink screen 3 of the present application uses the aforementioned electronic ink as a display material, and uses different magnetic fields to make the electronic ink in different display units 300 show different display effects, and its control method is simple and reliable.
  • the photoluminescent material of the microcapsule 1 in the electronic ink can be selected in a wide range, especially when the photoluminescent material is selected as a quantum dot material, an electronic ink screen 3 with excellent color display effect can be obtained.
  • the second filler 13 of the microcapsule 1 in each display unit 300 emits light of the same color under the irradiation of excitation light, that is, the light emission color of each display unit 300 is the same. In other embodiments, at least part of the second filler 13 of the microcapsule 1 in the display unit 300 emits light of different colors under the irradiation of the excitation light, that is, at least part of the display unit 300 emits different colors.
  • the display units 300 are arranged in an array, and the ink containing cavities 30 in each display unit 300 are arranged in an array.
  • the display units 300 are opaque, that is, the display units 300 are blocked by light-shielding materials to prevent the light of the display unit 300a performing display from entering the adjacent non-display display unit 300b.
  • each display unit 300 includes a plurality of ink containing chambers 30, that is, the first magnetic field generating device 31 and the second magnetic field generating device 32 of each display unit 300 control the display of the plurality of ink containing chambers 30 Status, as shown in Figure 5. This is beneficial to reduce production costs, and is suitable for electronic ink screens 3 that do not require high resolution.
  • each display unit 300 includes an ink containing cavity 30, that is, each pair of the first magnetic field generating device 31 and the second magnetic field generating device 32 controls the display state of one ink containing cavity 30 to achieve Independent control of the pixels is beneficial to obtain a high-resolution electronic ink screen 3, as shown in Figures 6 and 7.
  • the ink containing cavity 30 includes a top wall 301, a bottom wall 302, and a side wall 303 surrounding the periphery.
  • the top wall 301 is light-transmissive, and the side wall 303 is opaque.
  • the side wall 303 is opaque to prevent the light in the ink containing cavity 30 for display from entering the adjacent non-display ink containing cavity 30.
  • the first magnetic field generating device 31 is disposed above the top wall 301, the area of the first magnetic field generating device 31 opposite to the top wall 301 is light-transmissive, and the second magnetic field generating device 32 is disposed below the bottom wall 302. It can be understood that the first magnetic field generating device 31 is opposite to the top wall 301 of the one or more ink containing cavities 30, and the second magnetic field generating device 32 is opposite to the bottom wall 302 of the one or more ink containing cavities 30.
  • the first magnetic field generating device 31 is adapted to generate a first magnetic field at the top wall 301 of the ink containing cavity 30, and the second magnetic field generating device 32 is adapted to generate a second magnetic field at the bottom wall 302 of the ink containing cavity 30.
  • the excitation light passes through the first magnetic field generating device 31 and the top wall 301 to enter the ink containing cavity 30.
  • the information display of the electronic ink screen 3 is realized by controlling the opening and closing of each first magnetic field generating device 31 or the second magnetic field generating device 32.
  • top wall 301 and the first magnetic field generating device 31 may be two parts of an integral part, or two separate parts, and the bottom wall 302 and the second magnetic field generating device 32 may be an integral part.
  • the two parts can also be two independent parts, which are not limited in this application.
  • the microcapsules 1 in the electronic ink are dispersed in the solvent 2 relatively disorderly, as shown in FIG. 6.
  • the state of the electronic ink in each ink containing cavity 30 is basically the same.
  • the luminous degree of the electronic ink in each ink containing cavity 30 is basically the same.
  • the electronic ink screen 3 cannot display Effective display information.
  • the second magnetic field generating device 32 on the lower side of the ink accommodating cavity 30a that needs to be displayed generates a second magnetic field
  • the microcapsules in the ink accommodating cavity 30a that needs to be displayed 1 is rotated under the action of a magnetic field, so that the first end 111 of the microcapsule 1 faces downwards, and the second end 112 faces upwards, and the microcapsules 1 are gathered on the side of the ink containing cavity 30a close to the second magnetic field generating device 32, as shown in Fig.
  • the external incident light enters from the upper side of the ink containing cavity 30a and irradiates the second end 112 of the microcapsule 1, and the second filler 13 in the second end 112 emits differently from the incident light under the excitation of the incident light.
  • the emitted light of the color is emitted from the upper side of the ink containing chamber 30a, so that the ink containing chamber 30a completes the display; the first magnetic field generating device 31 on the upper side of the non-displayed ink containing chamber 30b generates a magnetic field, and the non-displayed ink
  • the microcapsule 1 in the accommodating cavity 30b rotates under the action of a magnetic field, so that the first end 111 of the microcapsule 1 faces upwards, the second end 112 faces downwards, and the microcapsules 1 are gathered in the ink accommodating cavity 30b close to the first magnetic field generating device 31
  • external incident light enters from the upper side of the ink containing chamber 30b and irradiates the first end 111 of the microcapsule 1.
  • the first filler 12 at the first end 111 does not emit light or emits light
  • the second filler 13 has different colors of light, so that the non-displayed ink accommodating cavity 30b and the displayed ink accommodating cavity 30a form a color contrast, so that the electronic ink screen 3 presents the information that needs to be displayed.
  • External incident light can come from ambient light or front light source.
  • the electronic ink screen 3 further includes a bottom plate 33 and a substrate 35.
  • Each second magnetic field generating device 32 is provided on the bottom plate 33, each second magnetic field generating device 32 is provided with at least one ink containing cavity 30, and each first magnetic field generating device 31 and each second magnetic field generating device 32 are provided in a one-to-one correspondence.
  • a substrate 35 is provided on each first magnetic field generating device 32, and the substrate 35 transmits light.
  • the electronic ink fills each ink containing cavity 30.
  • This application also provides a display method, including the following steps:
  • An electronic ink screen which has a plurality of display units, each display unit includes at least one ink accommodating cavity, the display side of each ink accommodating cavity is transparent, and each ink accommodating cavity is filled with the aforementioned electronic ink of this application;
  • a first magnetic field is generated on the display side of the display unit that does not need to display, and the first magnetic field makes the first end 111 of the microcapsule 1 contained in the display unit face the display side, and the second end 112 is away from the display side;
  • a second magnetic field is generated on the other side of the display unit to be displayed away from the display side, the second magnetic field makes the first end 111 of the microcapsule 1 contained in the display unit away from the display side, and the second end 112 faces the display side;
  • the incident light is irradiated into each ink containing cavity from the display side, the second filler 13 in the second end 112 facing the display side emits light under the excitation of the incident light, and the first filler 12 in the first end 111 facing the display side does not emit light. It emits light or emits light of a different color from the second filler 13.
  • the incident light comes from ambient light or front light source.
  • the present application also provides a display device 4, which includes the electronic ink screen 3 and a control system described in the present application.
  • the control system is electrically connected to the first magnetic field generating device and the second magnetic field generating device of each display unit of the electronic ink screen 3, and To control the generation of the first magnetic field and the second magnetic field.
  • the display device 4 provided in this application can be used as an electronic price tag. Its application scenario is shown in FIG. Generally, the ambient light (such as sunlight, LED lights) in a shopping mall contains a large amount of short-wavelength light, and these short-wavelength lights can excite the second filler 13 to emit light, so as to realize the information display of the electronic ink screen 3 with low energy consumption. .
  • the ambient light such as sunlight, LED lights
  • the display device 4 further includes an excitation light source.
  • the excitation light source is used to excite the electronic ink of the electronic ink screen to emit light.
  • the excitation light source is arranged above the electronic ink screen 3 to generate excitation light to excite the second filler 13 of the microcapsule 1 in the electronic ink to emit light.
  • the excitation light source can guarantee the display effect of the electronic ink screen 3, so that the display brightness of the electronic ink screen 3 is higher, and the display color is more vivid.
  • the display device 4 further includes a light guide plate for uniformly dispersing the light of the excitation light source.
  • the display device 4 is used for electronic price tags
  • the excitation light source 41 of the display device 4 is a light bar emitting blue light, which is arranged at the bottom of the upper shelf 5 and opposite to the electronic ink screen 3 on the lower shelf 5 , The excitation light is used as the incident light of the electronic ink screen 3.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种微胶囊（1）、电子墨水、电子墨水屏（3）、显示方法以及显示装置（4）。电子墨水包括溶剂（2）以及分散在溶剂（2）中的多个微胶囊（1），微胶囊（1）包括胶囊壳层（11），胶囊壳层（11）界定胶囊容纳腔（110），胶囊容纳腔（110）的第一端（111）填充第一填料（12），胶囊容纳腔（110）远离第一端（111）的第二端（112）填充第二填料（13），第一填料（12）具有磁性，第二填料（13）不具有磁性或磁性弱于第一填料（12），第二填料（13）的材料为光致发光材料，胶囊壳层（11）可透光；在相同光照下，第一填料（12）不发光，第二填料（13）发光；或者，在相同光照下，第一填料（12）与第二填料（13）发出不同颜色的光。微胶囊（1）可以通过施加不同方向的磁场，改变其朝特定方向的显示效果，电子墨水的显示颜色可根据需要定制，通过合理选择微胶囊（1）中的第二填料（13）即可实现。

Description

微胶囊、电子墨水、电子墨水屏、显示方法以及显示装置 技术领域
本申请涉及显示技术领域，尤其涉及微胶囊、电子墨水、电子墨水屏、显示方法以及显示装置。
背景技术
电子墨水屏即为使用电子墨水的屏幕，这一技术也被称为电子纸显示技术。电子墨水屏的应用范围广泛，大到已经商业化的电子书，小到电子价签。电子价签也叫电子货架标签，是一种带有信息收发功能的电子显示装置，每一个电子价签通过有线或无线网络与商场计算机数据库相连，并将最新的商品信息通过电子价签上的显示屏显示出来，具有操作简单、易阅读、节约纸张和人力资源的优势。
现阶段广泛使用的电子墨水屏主要是黑白显示屏，实现电子墨水屏的彩色化是电子墨水屏的发展方向。
申请内容
本申请的一个目的在于提供一种可用于显示的微胶囊以及包括该微胶囊的电子墨水。
本申请的另一个目的在于提供一种可用于部分彩色显示或全彩显示的电子墨水屏以及包括该电子墨水屏的显示装置。
根据本申请的一个方面，提供一种微胶囊，包括胶囊壳层，所述胶囊壳层界定胶囊容纳腔，所述胶囊容纳腔的第一端填充第一填料，所述胶囊容纳腔远离所述第一端的第二端填充第二填料，所述第一填料具有磁性，所述第二填料不具有磁性或磁性弱于所述第一填料，所述第二填料的材料包括光致发光材料，所述胶囊壳层可透光；
在激发光照射下，所述第一填料不发光，所述第二填料发光；
或者，在激发光照射下，所述第一填料与所述第二填料发出不同颜色的光。
进一步地，所述微胶囊的粒径为50μm～500μm，所述第一填料中粒子的粒径为 100nm～1μm，所述第二填料中粒子的粒径为1nm～100nm。
进一步地，所述第一填料的材料包括铁磁性材料或亚铁磁性材料。
进一步地，所述第二填料的材料包括量子点材料。
进一步地，所述胶囊容纳腔的所述第一端与所述第二端之间设有阻隔层，所述阻隔层将所述第一端与所述第二端隔离。
根据本申请的另一个方面，提供一种电子墨水，包括溶剂以及分散在所述溶剂中的多个微胶囊，所述微胶囊如前述任意一种的微胶囊。
根据本申请的另一个方面，提供一种电子墨水屏，包括多个显示单元，每一所述显示单元包括至少一墨水容纳腔，各所述墨水容纳腔的显示侧透光，所述墨水容纳腔内填充本申请前述的电子墨水，所述显示单元还包括第一磁场发生装置以及第二磁场发生装置；所述第一磁场发生装置可控地在所述显示单元的显示侧产生第一磁场，从而包含在所述显示单元内的所述微胶囊的所述第一端在所述第一磁场的作用下转向所述显示侧，所述第二端远离所述显示侧；所述第二磁场发生装置可控地在所述显示单元远离所述显示侧的另一侧产生第二磁场，从而包含在所述显示单元内的所述微胶囊的第一端在所述第二磁场的作用下远离所述显示侧，所述第二端转向所述显示侧。
进一步地，各所述显示单元呈阵列设置，每一所述显示单元内的各所述墨水容纳腔呈阵列设置，各所述显示单元之间不透光。
进一步地，所述墨水容纳腔的内壁包括顶壁、底壁以及围绕于四周的侧壁，所述顶壁透光，所述侧壁不透光，所述第一磁场发生装置设置在所述顶壁上方，所述第一磁场发生装置与所述顶壁相对的区域透光，所述第二磁场发生装置设置在所述底壁下方。
根据本申请的另一个方面，提供一种显示方法，包括以下步骤：
提供一电子墨水屏，其具有多个显示单元，每一显示单元包括至少一个墨水容纳腔，各所述墨水容纳腔的显示侧透光，每一所述墨水容纳腔内填充前述的电子墨水；
在不需要进行显示的所述显示单元的显示侧产生第一磁场，所述第一磁场使得包含在 所述显示单元内的所述微胶囊的所述第一端朝向所述显示侧，所述第二端远离所述显示侧；
在需要进行显示的所述显示单元远离所述显示侧的另一侧产生第二磁场，所述第二磁场使得包含在所述显示单元内的所述微胶囊的所述第一端远离所述显示侧，所述第二端朝向所述显示侧；
入射光从所述显示侧照射向各所述墨水容纳腔内，朝向所述显示侧的所述第二端内的所述第二填料在入射光的激发下发光，朝向所述显示侧的所述第一端内的所述第一填料不发光或者发出与所述第二填料颜色不同的光。
根据本申请的另一个方面，提供一种显示装置，包括本申请前述的电子墨水屏以及控制系统，所述控制系统与各所述显示单元的所述第一磁场发生装置和第二磁场发生装置电连接，其用于控制所述第一磁场以及所述第二磁场的产生。
进一步地，所述显示装置应用于电子价签，所述显示装置还包括激发光源，所述激发光源用于激发所述电子墨水屏的所述电子墨水发光。
进一步地，所述显示装置还包括激发光源。
与现有技术相比，本申请的有益效果在于：
(1)本申请的微胶囊可以通过施加不同方向的磁场，改变其朝特定方向的显示效果，该微胶囊可用于显示。
(2)本申请的电子墨水将微胶囊分散在溶剂中，从而微胶囊在磁场作用下可于溶剂中自由旋转，使微胶囊的定向排列能够更好地实现。
(3)本申请的电子墨水屏的显示颜色可根据需要定制，通过合理选择微胶囊中的第一填料和第二填料。
附图说明
图1为本申请的微胶囊的一个实施例的示意图；
图2为本申请的微胶囊的另一个实施例的示意图；
图3为本申请的电子墨水的一个实施例的示意图；
图4为本申请的电子墨水屏的一个实施例的部分示意图；
图5为本申请的电子墨水屏的显示单元的一个实施例的示意图，显示了第二磁场发生装置产生第二磁场的状态；
图6为本申请的电子墨水屏的一部分的纵剖面示意图，显示了各第一磁场发生装置以及各第二磁场发生装置均未开启的状态；
图7为本申请的电子墨水屏的一部分的纵剖面示意图，其中需要显示的墨水容纳腔的第二磁场发生装置产生第二磁场，不需要显示的墨水容纳腔的第一磁场发生装置产生第一磁场；
图8显示了本申请的显示装置的一个应用场景；
图中：
1、微胶囊；11、胶囊壳层；110、胶囊容纳腔；111、第一端；112、第二端；12、第一填料；13、第二填料；14、阻隔层；
2、溶剂；
3、电子墨水屏；300(300a/300b)、显示单元；30(30a/30b)、墨水容纳腔；301、顶壁；302、底面；303、侧壁；31、第一磁场发生装置；32、第二磁场发生装置；33、底板；34、像素界定层；35、基板。
4、显示装置；41、激发光源；
5、货架。
具体实施方式
下面，结合具体实施方式，对本申请做进一步描述，需要说明的是，在不相冲突的前提下，以下描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例。
在本申请的描述中，需要说明的是，对于方位词，如有术语“中心”、“横向”、“纵向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、 “内”、“外”、“顺时针”、“逆时针”等指示方位和位置关系为基于附图所示的方位或位置关系，仅是为了便于叙述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定方位构造和操作，不能理解为限制本申请的具体保护范围。
需要说明的是，本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
本申请的说明书和权利要求书中的术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本申请提供一种微胶囊1，如图1所示，包括胶囊壳层11，胶囊壳层11界定胶囊容纳腔110，胶囊容纳腔110的第一端111填充第一填料12，胶囊容纳腔110远离第一端111的第二端112填充第二填料13。
第一填料12具有磁性，第二填料13不具有磁性或者磁性弱于第一填料12，从而微胶囊1处于磁场中时，微胶囊1的第一端111受到磁场的作用力大于第二端112，使得微胶囊1的第一端111趋于转向磁场的方向，并沿磁场方向移动。
第二填料13的材料包括光致发光材料。胶囊壳层11可透光，从而允许光线穿过胶囊壳层11照射到第二填料13，也允许第二填料13发出的光透过胶囊壳层11。
在激发光照射下，第一填料12不发光、第二填料13发光，或者第一填料12与第二填料13发射不同颜色的光。第一填料13的材料可以是光致发光材料，也可以不是。激发光分别照射微胶囊1的第一端111和第二端112时，第一端111与第二端112的显示效果不同。
可以理解的是，第一填料12包括一种或多种磁性材料，第二填料13包括一种或多种光致发光材料，本申请对此不做限定。
本申请提供的微胶囊1可以在外部磁场作用下，实现定向排列，使微胶囊1的第一端111以及第二端112朝向特定的方向；此外，微胶囊1的两端对激发光的响应不同，因此在本 申请中，通过施加不同的磁场，可改变微胶囊1朝特定方向的显示效果。
在一些实施例中，微胶囊1的粒径为50μm～500μm。微胶囊的粒径大小结合胶囊容纳腔的体积综合考虑。在一些实施例中，微胶囊的粒径指的是物体最大的长度或者平均长度。各个微胶囊1的粒径可以不同也可以相同。在一些实施例中，各个微胶囊1的粒径偏差在20％以内或10％以内。在一些实施例中，微胶囊1的形状可以是球体或者类球体或者其他两端对称的形状。
在一些实施例中，第一填料12中的粒子的粒径为100nm～1μm。
在一些实施例中，第二填料13中的粒子的粒径为1nm～100nm。在一些实施例中，第一填料12和第二填料13整体在微胶囊1中的填充率大于等于50％，或大于等于60％，或大于等于70％，或大于等于80％，或大于等于90％。
在一些实施例中，如图2所述，胶囊容纳腔110的第一端111与第二端112之间设有阻隔层14，阻隔层14使得微胶囊容纳腔110的第一端111与第二端112相互隔离。阻隔层14可以避免第一填料12与第二填料13混合。
在一些实施例中，第一填料12的材料包括铁磁性材料或亚铁磁性材料，如钕铁硼强磁、铁氧体磁铁、四氧化三铁、铁硅铝粉等。第一填料12的材料仅包括铁磁性或亚铁磁性材料时，第一填料不会被光激发，可以显示为黑色。
在一些实施例中，第二填料13包括量子点材料。量子点材料具有发射半峰宽窄、发射峰可调等优点，利用量子点材料作为发光材料，可以实现彩色显示。量子点材料可以是二元或多元的II-VI族半导体材料、二元或多元的III-V族半导体材料等。量子点材料可以是核量子点或核壳量子点。量子点材料可以是合金的或非合金的，可以包括掺杂元素的或不包括掺杂元素的。量子点材料可以不是石墨烯量子点或碳量子点或钙钛矿量子点。
本申请的微胶囊1的结构类似Janus(双面神)结构，其制备方法可采用现有的Janus粒子结构的制备方法，如微流控技术、界面聚合或者喷雾干燥法。
本申请还提供一种电子墨水，其包括溶剂2以及分散在溶剂2中的多个微胶囊1，如 图3所示。将微胶囊1分散在溶剂2中，可以保证微胶囊1在外磁场作用下能够自由旋转，更有利于实现多个微胶囊1的定向排列。
溶剂2的选择需要考虑胶囊壳层11的材料，溶剂2需要很好地分散微胶囊1，但是又不溶解微胶囊1。溶剂2优选地还具有高沸点、低粘度、高透光率、高稳定性、无异味、环境友好等特点。溶剂2可以是烯烃、烷烃、醚类等。具体地，溶剂2可以是十八烯。
本申请还提供一种电子墨水屏3，其包括多个显示单元300，每一显示单元300包括至少一个墨水容纳腔30，墨水容纳腔30的显示侧透光，墨水容纳腔30内填充本申请前述的电子墨水。显示单元300还包括第一磁场发生装置31以及第二磁场发生装置32；第一磁场发生装置31可控地在显示单元300的显示侧产生第一磁场，从而包含在显示单元300内的微胶囊1的第一端111在第一磁场的作用下转向显示侧，第二端112远离显示侧；第二磁场发生装置32可控地在显示单元300远离显示侧的另一侧产生第二磁场，从而包含在显示单元300内的微胶囊1的第一端111在第二磁场的作用下远离显示侧，第二端112转向显示侧。
可以理解的是，墨水容纳腔30的显示侧与显示单元300的显示侧为同一侧。
图4为电子墨水屏3的一个实施例显示时的示例，其中显示单元300a发光以进行显示，显示单元300b不发光或者发出不同颜色的光，从而与进行显示的显示单元300a形成色彩对比。控制显示单元300a的第二磁场发生装置32产生第二磁场，使得其中微胶囊1的第二端112朝向显示侧，此时，从显示侧进入墨水容纳腔30的激发光可以激发第二端112内的第二填料13发光。同时，控制显示单元300b的第一磁场发生装置31产生第一磁场，使得其中微胶囊1的第一端111朝向显示侧，此时，从显示侧进入墨水容纳腔30的激发光照射到第一端111内的第一填料12，第一填料12不发光或者发射与第二填料13颜色不同的光。
本申请的电子墨水屏3利用前述电子墨水作为显示材料，利用不同的磁场使不同显示单元300内的电子墨水呈现不同的显示效果，其控制方法简单可靠。此外，由于电子墨水中微胶囊1的光致发光材料可选范围广泛，尤其当光致发光材料选择量子点材料时，可以获得彩色显示效果优秀的电子墨水屏3。
在一些实施例中，各个显示单元300内的微胶囊1的第二填料13在激发光的照射下， 发射相同颜色的光，也即各显示单元300的发光颜色相同。在另一些实施例中，至少部分显示单元300内的微胶囊1的第二填料13在激发光的照射下，发射不同颜色的光，也即至少部分显示单元300的发光颜色不同。
在一些实施例中，各显示单元300呈阵列设置，每一显示单元300内的各墨水容纳腔30呈阵列设置。各显示单元300之间不透光，也即各显示单元300之间采用遮光的材料阻隔，以避免进行显示的显示单元300a的光线进入到相邻的不显示的显示单元300b内。
在一些实施例中，每一显示单元300包括多个墨水容纳腔30，也即，每一显示单元300的第一磁场发生装置31和第二磁场发生装置32控制多个墨水容纳腔30的显示状态，如图5所示。这样有利于降低制作成本，适用于对分辨率要求不高的电子墨水屏3。
在另一些实施例中，每一显示单元300包括一个墨水容纳腔30，也即，每一对第一磁场发生装置31和第二磁场发生装置32控制一个墨水容纳腔30的显示状态，实现了像素的独立控制，这样有利于获得高分辨率的电子墨水屏3，如图6、7所示。
在一些实施例中，墨水容纳腔30包括顶壁301、底壁302以及围绕于四周的侧壁303，顶壁301透光，侧壁303不透光。侧壁303不透光可以避免显示的墨水容纳腔30内的光线射入相邻的非显示墨水容纳腔30内。
在一些实施例中，第一磁场发生装置31设置在顶壁301上方，第一磁场发生装置31与顶壁301相对的区域透光，第二磁场发生装置32设置在底壁302下方。可以理解的是，第一磁场发生装置31与一个或多个墨水容纳腔30的顶壁301相对，第二磁场发生装置32与一个或多个墨水容纳腔30的底壁302相对。第一磁场发生装置31适于在墨水容纳腔30的顶壁301处产生第一磁场，第二磁场发生装置32适于在墨水容纳腔30的底壁302处产生第二磁场。激发光线透过第一磁场发生装置31以及顶壁301入射到墨水容纳腔30内。电子墨水屏3信息的显示通过控制各个第一磁场发生装置31或第二磁场发生装置32的开启与关闭实现。
可值得一提的是，顶壁301与第一磁场发生装置31可以是一整体部件的两个部分，也可以是两独立的部件，底壁302与第二磁场发生装置32可以是一整体部件的两个部分，也可以是两独立的部件，本申请对此不做限定。
当各墨水容纳腔30的第一磁场发生装置31以及第二磁场发生装置32均未开启时，电子墨水中的微胶囊1相对无序地分散在溶剂2中，如图6所示。此时各个墨水容纳腔30内的电子墨水的状态基本一致，外部光源进入各墨水容纳腔30后，各个墨水容纳腔30内的电子墨水的发光程度基本一致，此时的电子墨水屏3无法呈现有效的显示信息。
当墨水容纳腔30a需要显示，墨水容纳腔30b不需要显示时：使需要显示的墨水容纳腔30a下侧的第二磁场发生装置32产生第二磁场，需要显示的墨水容纳腔30a内的微胶囊1在磁场作用下旋转，从而微胶囊1的第一端111朝下，第二端112朝上，且微胶囊1聚集在墨水容纳腔30a靠近第二磁场发生装置32的一侧，如图7所示，外部的入射光从墨水容纳腔30a的上侧进入，并照射到微胶囊1的第二端112，第二端112内的第二填料13在入射光的激发下发出与入射光不同颜色的发射光，发射光从墨水容纳腔30a的上侧射出，从而该墨水容纳腔30a完成显示；使不显示的墨水容纳腔30b上侧的第一磁场发生装置31产生磁场，不显示的墨水容纳腔30b内的微胶囊1在磁场作用下旋转，从而微胶囊1的第一端111朝上，第二端112朝下，且微胶囊1聚集在墨水容纳腔30b靠近第一磁场发生装置31的一侧，如图7所示，外部的入射光从墨水容纳腔30b的上侧进入，并照射到微胶囊1的第一端111，第一端111的第一填料12不发光或者发出与第二填料13颜色不同的光，从而不显示的墨水容纳腔30b与显示的墨水容纳腔30a形成颜色对比，使电子墨水屏3呈现出需要显示的信息。外部入射光可以来自环境光或前置光源。
在一些实施例中，电子墨水屏3还包括底板33以及基板35。各第二磁场发生装置32设于底板33上，每一第二磁场发生装置32上设置至少一墨水容纳腔30，各第一磁场发生装置31与各第二磁场发生装置32一一对应地设置在墨水容纳腔30的两侧，基板35设置在各第一磁场发生装置32上，基板35透光。
在一些实施例中，电子墨水充满各墨水容纳腔30。
本申请还提供一种显示方法，包括以下步骤：
提供一电子墨水屏，其具有多个显示单元，每一显示单元包括至少一墨水容纳腔，各墨水容纳腔的显示侧透光，每一墨水容纳腔内填充本申请前述的电子墨水；
在不需要进行显示的显示单元的显示侧产生第一磁场，第一磁场使得包含在显示单元内的微胶囊1的第一端111朝向显示侧，第二端112远离显示侧；
在需要进行显示的显示单元远离显示侧的另一侧产生第二磁场，第二磁场使得包含在显示单元内的微胶囊1的第一端111远离显示侧，第二端112朝向显示侧；
入射光从显示侧照射向各墨水容纳腔内，朝向显示侧的第二端112内的第二填料13在入射光的激发下发光，朝向显示侧的第一端111内的第一填料12不发光或者发出与第二填料13颜色不同的光。入射光来自环境光或前置光源。
本申请还提供一种显示装置4，包括本申请前述的电子墨水屏3以及控制系统，控制系统与电子墨水屏3的各显示单元的第一磁场发生装置和第二磁场发生装置电连接，用于控制第一磁场以及第二磁场的产生。
本申请提供的显示装置4可作为电子价签使用，其应用场景如图8所示，电子墨水屏3设置在货架5上，用于显示货架上物品的名称、价格、商标等信息。通常，商场内的环境光(如太阳光、LED灯)中包含大量的短波长光，这些短波长光均可以激发第二填料13发光，从而实现电子墨水屏3的信息显示，且能耗小。
在一些实施例中，显示装置4还包括激发光源。激发光源用于激发所述电子墨水屏的电子墨水发光。在一些实施例中，激发光源设置在电子墨水屏3上方，用于产生激发光，激发电子墨水中微胶囊1的第二填料13发光。激发光源一方面可以保障电子墨水屏3的显示效果，使得电子墨水屏3的显示亮度更高，显示颜色更鲜艳。在一些实施例中，显示装置4还包括导光板，用于将激发光源的光均匀分散。
在一些实施例中，显示装置4用于电子价签，显示装置4的激发光源41为发射蓝光的灯条，其设置在上层货架5的底部，并与下层货架5上的电子墨水屏3相对，激发光作为电子墨水屏3的入射光。
以上描述了本申请的基本原理、主要特征和本申请的优点。本行业的技术人员应该了解，本申请不受上述实施例的限制，上述实施例和说明书中描述的只是本申请的原理，在不脱离本申请精神和范围的前提下本申请还会有各种变化和改进，这些变化和改进都落入要求保护 的本申请的范围内。本申请要求的保护范围由所附的权利要求书及其等同物界定。

Claims (13)

  1. 微胶囊，其特征在于，包括胶囊壳层，所述胶囊壳层界定胶囊容纳腔，所述胶囊容纳腔的第一端填充第一填料，所述胶囊容纳腔远离所述第一端的第二端填充第二填料，所述第一填料具有磁性，所述第二填料不具有磁性或磁性弱于所述第一填料，所述第二填料的材料包括光致发光材料，所述胶囊壳层可透光；
    在激发光照射下，所述第一填料不发光，所述第二填料发光；
    或者，在激发光照射下，所述第一填料与所述第二填料发出不同颜色的光。
  2. 根据权利要求1所述的微胶囊，其特征在于，所述微胶囊的粒径为50μm～500μm，所述第一填料中的粒子的粒径为100nm～1μm，所述第二填料中的粒子的粒径为1nm～100nm。
  3. 根据权利要求1所述的微胶囊，其特征在于，所述第一填料的材料包括铁磁性材料或亚铁磁性材料。
  4. 根据权利要求1所述的微胶囊，其特征在于，所述第二填料的材料包括量子点材料。
  5. 根据权利要求1-4任一所述的微胶囊，其特征在于，所述胶囊容纳腔的所述第一端与所述第二端之间设有阻隔层，所述阻隔层将所述第一端与所述第二端隔离。
  6. 电子墨水，其特征在于，包括溶剂以及分散在所述溶剂中的多个微胶囊，所述微胶囊如权利要求1-5任一所述的微胶囊。
  7. 电子墨水屏，包括多个显示单元，其特征在于，每一所述显示单元包括至少一墨水容纳腔，各所述墨水容纳腔的显示侧透光，所述墨水容纳腔内填充如权利要求6所述的电子墨水，所述显示单元还包括第一磁场发生装置以及第二磁场发生装置；所述第一磁场发生装置可控地在所述显示单元的显示侧产生第一磁场，从而包含在所述显示单元内的所述微胶囊的所述第一端在所述第一磁场的作用下转向所述显示侧，所述第二端远离所述显示侧；所述第二磁场发生装置可控地在所述显示单元远离所述显示侧的另一侧产生第二磁场，从而包含在所述显示单元内的所述微胶囊的第一端在所述第二磁场的作用下远离所述显示侧，所述第二端转向所述显示 侧。
  8. 根据权利要求7所述的电子墨水屏，其特征在于，各所述显示单元呈阵列设置，每一所述显示单元内的各所述墨水容纳腔呈阵列设置，各所述显示单元之间不透光。
  9. 根据权利要求7或8所述的电子墨水屏，其特征在于，所述墨水容纳腔的内壁包括顶壁、底壁以及围绕于四周的侧壁，所述顶壁透光，所述侧壁不透光，所述第一磁场发生装置设置在所述顶壁上方，所述第一磁场发生装置与所述顶壁相对的区域透光，所述第二磁场发生装置设置在所述底壁下方。
  10. 显示方法，其特征在于，包括以下步骤：
    提供一电子墨水屏，其具有多个显示单元，每一显示单元包括至少一个墨水容纳腔，各所述墨水容纳腔的显示侧透光，每一所述墨水容纳腔内填充如权利要求6所述的电子墨水；
    在不需要进行显示的所述显示单元的显示侧产生第一磁场，所述第一磁场使得包含在所述显示单元内的所述微胶囊的所述第一端朝向所述显示侧，所述第二端远离所述显示侧；
    在需要进行显示的所述显示单元远离所述显示侧的另一侧产生第二磁场，所述第二磁场使得包含在所述显示单元内的所述微胶囊的所述第一端远离所述显示侧，所述第二端朝向所述显示侧；
    入射光从所述显示侧照射向各所述墨水容纳腔内，朝向所述显示侧的所述第二端内的所述第二填料在入射光的激发下发光，朝向所述显示侧的所述第一端内的所述第一填料不发光或者发出与所述第二填料颜色不同的光。
  11. 显示装置，其特征在于，包括如权利要求7-9任一所述的电子墨水屏以及控制系统，所述控制系统与各所述显示单元的所述第一磁场发生装置和第二磁场发生装置电连接，其用于控制所述第一磁场以及所述第二磁场的产生。
  12. 根据权利要求11所述的显示装置，其特征在于，所述显示装置应用于电子价签，所述显示装置还包括激发光源，所述激发光源用于激发所述电子墨水屏的所述电子墨水发光。
  13. 根据权利要求11所述的显示装置，其特征在于，所述显示装置还包括激发光源。
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