CN110780756B - Handwriting screen, handwriting pen, handwriting device, control method of handwriting device and preparation method of handwriting device - Google Patents
Handwriting screen, handwriting pen, handwriting device, control method of handwriting device and preparation method of handwriting device Download PDFInfo
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- CN110780756B CN110780756B CN201911108044.5A CN201911108044A CN110780756B CN 110780756 B CN110780756 B CN 110780756B CN 201911108044 A CN201911108044 A CN 201911108044A CN 110780756 B CN110780756 B CN 110780756B
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03547—Touch pads, in which fingers can move on a surface
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
Abstract
The application provides a handwriting screen, a handwriting pen, a handwriting device, a control method and a preparation method thereof, wherein the handwriting screen comprises a power supply unit and a display unit, a first friction layer in the power supply unit stretches and contracts under the control of an external magnetic field, the volume changes, friction charges are generated when the volume of the first friction layer increases to be in contact with a second friction layer, and then the first electrode layer and the second electrode layer output driving current to the display unit according to the friction charges, and the display unit displays handwriting corresponding to the external magnetic field. The application adopts the non-contact external magnetic field to realize handwriting writing, so that the pressure touch type handwriting pen can be prevented from damaging a screen, and the power supply unit is used for supplying power to the display unit, and a power supply device is not required to be additionally arranged, so that the portability of the handwriting device is improved.
Description
Technical Field
The application relates to the technical field of handwriting display, in particular to a handwriting screen, a handwriting pen, a handwriting device, a control method of the handwriting screen, and a preparation method of the handwriting device.
Background
With the development of display technology, handwriting devices with display functions are increasingly favored by users. The existing handwriting screen generally adopts a touch control-like mode, and the writing track is perceived through the change of parameters such as pressure, capacitance and the like. On one hand, the touch mode is easy to scratch the surface of the display screen, and the appearance of the display screen is damaged; on the other hand, the existing handwriting screen generally needs to be additionally provided with a power supply device, so that the existing handwriting device is large in size and poor in portability.
Disclosure of Invention
The invention provides a handwriting screen, a handwriting pen, a handwriting device, a control method and a preparation method thereof, so that the screen is prevented from being damaged, and the portability of the handwriting device is improved.
In order to solve the above problems, the present invention discloses a handwriting screen including a first substrate and a second substrate disposed opposite to each other, and a plurality of pixel units disposed between the first substrate and the second substrate, each of the pixel units including a power supply unit and a display unit;
the power supply unit comprises a first electrode layer and a first friction layer which are arranged on the first substrate in a stacked manner, and a second electrode layer and a second friction layer which are arranged on the second substrate in a stacked manner, wherein the first friction layer is arranged close to the second substrate, and the second friction layer is arranged close to the first substrate;
The display unit is arranged between the exposed first electrode layer and the exposed second electrode layer;
the first friction layer comprises a magnetostrictive material and is used for performing telescopic movement under the control of an external magnetic field, contacting with or separating from the second friction layer, and generating friction charges when the first friction layer contacts with the second friction layer; the first electrode layer and the second electrode layer are used for generating driving current according to the friction charges; the display unit is used for displaying handwriting corresponding to the external magnetic field under the action of the driving current.
Optionally, the first friction layer includes a base material and magnetostrictive particles filled in the base material.
Optionally, the first friction layer further comprises barium titanate nanoparticles filled in the substrate.
Optionally, the second friction layer is a metal film layer.
Optionally, the surface of the first friction layer adjacent to the second friction layer and/or the surface of the second friction layer adjacent to the first friction layer has a micro-nanostructure.
Optionally, the display unit comprises a dispersion filled between the first electrode layer and the second electrode layer, positively charged first electrophoretic particles and negatively charged second electrophoretic particles,
Wherein the first electrophoretic particles are used for displaying dark states and the second electrophoretic particles are used for displaying bright states; alternatively, the first electrophoretic particles are used to display a bright state and the second electrophoretic particles are used to display a dark state.
Optionally, the power supply unit further includes a buffer layer disposed between the first electrode layer and the first friction layer.
Optionally, each of the pixel units further includes a first support structure disposed between the first electrode layer and the second electrode layer, the first support structure being insulated for isolating the power supply unit from the display unit.
Optionally, each of the pixel units further includes a second support structure disposed between the first substrate and the second substrate, the second support structure being insulated for isolating each of the pixel units.
In order to solve the problems, the invention also discloses a handwriting pen which comprises a magnetic field emission device and a magnetic field adjusting device, wherein the magnetic field adjusting device is used for adjusting the intensity of the emitted magnetic field of the magnetic field emission device according to an external input instruction.
In order to solve the above problems, the invention also discloses a handwriting device, which comprises the handwriting screen according to any embodiment and the handwriting pen according to any embodiment.
In order to solve the problems, the invention also discloses a preparation method of the handwriting screen, wherein the handwriting screen comprises a first substrate and a second substrate which are oppositely arranged, and a plurality of pixel units arranged between the first substrate and the second substrate, and each pixel unit comprises a power supply unit and a display unit; the preparation method of each pixel unit comprises the following steps:
sequentially forming a first electrode layer and a first friction layer on the first substrate to obtain a first substrate, wherein the first friction layer is positioned in a region corresponding to the power supply unit;
forming a second electrode layer on the second substrate;
forming a second friction layer on the second electrode layer in a region corresponding to the power supply unit;
forming the display unit on the exposed second electrode layer to obtain a second substrate;
pairing the first substrate and the second substrate to obtain the pixel unit, wherein the display unit is positioned between the exposed first electrode layer and the exposed second electrode layer;
the first friction layer comprises a magnetostrictive material and is used for performing telescopic movement under the control of an external magnetic field, contacting with or separating from the second friction layer, and generating friction charges when the first friction layer contacts with the second friction layer; the first electrode layer and the second electrode layer are used for generating driving current according to the friction charges; the display unit is used for displaying handwriting corresponding to the external magnetic field under the action of the driving current.
Optionally, the step of sequentially forming a first electrode layer and a first friction layer on the first substrate to obtain a first substrate includes:
forming a first electrode layer on the first substrate;
and forming a buffer layer and a first friction layer on the first electrode layer in sequence in a region corresponding to the power supply unit to obtain a first substrate.
Optionally, after the step of forming the second electrode layer on the second substrate, before the step of forming the second friction layer on the second electrode layer in the region corresponding to the power supply unit, the method further includes:
a first support structure is formed on the second electrode layer, the first support structure being insulated for isolating the power supply unit from the display unit.
Optionally, before the step of forming the display unit on the exposed second electrode layer, the method further includes:
forming a second support structure on the second substrate, wherein the second support structure is insulated and is used for isolating each pixel unit;
the step of forming the display unit on the exposed second electrode layer includes:
forming a dispersion, positively charged first electrophoretic particles for displaying a dark state, and negatively charged second electrophoretic particles for displaying a bright state on the second electrode layer in a region between the first support structure and the second support structure; alternatively, the first electrophoretic particles are used to display a bright state and the second electrophoretic particles are used to display a dark state.
In order to solve the above problems, the present invention also discloses a control method of a handwriting screen, which is applied to the handwriting screen in any embodiment, and the control method includes:
the first friction layer stretches and contracts under the control of an external magnetic field and is contacted with or separated from the second friction layer, and friction charges are generated when the first friction layer is contacted with the second friction layer; the first electrode layer and the second electrode layer generate driving current according to the friction charges;
the display unit displays handwriting corresponding to the external magnetic field under the action of the driving current.
In order to solve the above problems, the present invention also discloses a control method of a stylus pen, which is applied to the stylus pen described in any embodiment, and the control method includes:
receiving an external input instruction;
and adjusting the intensity of the magnetic field emitted by the handwriting pen according to the external input instruction.
In order to solve the above problems, the present invention also discloses a control method of a handwriting device, which is applied to the handwriting device described in any embodiment, and the control method includes:
the handwriting pen receives a first external input instruction;
the handwriting pen adjusts the intensity of a first magnetic field emitted by the handwriting pen according to the first external input instruction;
The first friction layer performs telescopic movement under the control of the first magnetic field and is contacted with or separated from the second friction layer, and when the first friction layer is contacted with the second friction layer, a first friction charge is generated;
the first electrode layer and the second electrode layer generate a first driving current according to the first friction charge;
the display unit displays handwriting corresponding to the first magnetic field under the action of the first driving current.
Optionally, when the handwriting screen displays handwriting, the control method further includes:
the handwriting pen receives a second external input instruction;
the handwriting pen adjusts the intensity of a second magnetic field emitted by the handwriting pen according to the second external input instruction;
the first friction layer performs telescopic movement under the control of the second magnetic field and is contacted with or separated from the second friction layer, and when the first friction layer is contacted with the second friction layer, second friction charges are generated;
the first electrode layer and the second electrode layer generate a second driving current according to the second friction charge;
the display unit erases the writing trace under the action of the second driving current.
Compared with the prior art, the application has the following advantages:
the technical scheme of the application provides a handwriting screen, a handwriting pen, a handwriting device, a control method of the handwriting device and a preparation method of the handwriting device, wherein the handwriting screen comprises a first substrate and a second substrate which are oppositely arranged, and a plurality of pixel units arranged between the first substrate and the second substrate, and each pixel unit comprises a power supply unit and a display unit; the power supply unit comprises a first electrode layer and a first friction layer which are stacked on a first substrate, and a second electrode layer and a second friction layer which are stacked on a second substrate, wherein the first friction layer is arranged close to the second substrate, and the second friction layer is arranged close to the first substrate; the display unit is arranged between the exposed first electrode layer and the exposed second electrode layer; the first friction layer comprises a magnetostrictive material and is used for performing telescopic movement under the control of an external magnetic field, contacting or separating with the second friction layer, and generating friction charges when the first friction layer contacts with the second friction layer; the first electrode layer and the second electrode layer are used for generating driving current according to friction charges; the display unit is used for displaying handwriting corresponding to the external magnetic field under the action of the driving current. According to the technical scheme, the first friction layer in the power supply unit stretches under the control of the external magnetic field, the volume changes, friction charges are generated when the volume of the first friction layer increases to be in contact with the second friction layer, and then the first electrode layer and the second electrode layer output driving current to the display unit according to the friction charges, and writing corresponding to the external magnetic field is displayed by the display unit. The application adopts the non-contact external magnetic field to realize handwriting writing, so that the pressure touch type handwriting pen can be prevented from damaging a screen, and the power supply unit is used for supplying power to the display unit, and a power supply device is not required to be additionally arranged, so that the portability of the handwriting device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of a first pixel unit according to an embodiment of the application;
fig. 2 is a schematic cross-sectional structure of a second pixel unit according to an embodiment of the application;
FIG. 3 is a schematic diagram showing a cross-sectional structure of a handwriting screen during a writing process according to an embodiment of the present application;
FIG. 4 is a schematic diagram showing a cross-sectional structure of a handwriting screen in a process of forming handwriting according to an embodiment of the present application;
FIG. 5 shows a diagram of writing displayed on a handwriting screen provided by an embodiment of the application;
FIG. 6 is a schematic diagram showing a cross-sectional structure of a handwriting screen during another writing process according to an embodiment of the application;
fig. 7 is a schematic plan view of a handwriting screen with a first pixel unit structure according to an embodiment of the application;
FIG. 8 is a schematic diagram of a handwriting pen according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a handwriting device according to an embodiment of the application;
fig. 10 is a flowchart illustrating steps of a method for manufacturing a handwriting screen according to an embodiment of the present application;
FIG. 11a is a schematic cross-sectional view illustrating a first substrate preparation process according to an embodiment of the present application;
FIG. 11b is a schematic cross-sectional view illustrating a second substrate preparation process according to an embodiment of the present application;
fig. 12 is a flowchart showing steps of a method for controlling a handwriting screen according to an embodiment of the present application;
FIG. 13 is a flowchart showing steps of a method for controlling a stylus according to an embodiment of the present application;
fig. 14 is a flowchart showing steps of a method for controlling a handwriting device according to an embodiment of the present application;
fig. 15 is a flowchart illustrating steps of a specific implementation manner of a control method of a handwriting device according to an embodiment of the present application;
fig. 16 is a flowchart illustrating steps of a specific implementation manner of a control method of a handwriting device according to an embodiment of the present application.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
An embodiment of the present application provides a handwriting screen including a first substrate 11 and a second substrate 12 disposed opposite to each other, and a plurality of pixel units disposed between the first substrate 11 and the second substrate 12, each pixel unit including a power supply unit 13 and a display unit 14, as shown with reference to fig. 1 and 2.
The power supply unit 13 includes a first electrode layer 131 and a first friction layer 132 that are stacked on the first substrate 11, and a second electrode layer 133 and a second friction layer 134 that are stacked on the second substrate 12, the first friction layer 132 being disposed near the second substrate 12, and the second friction layer 134 being disposed near the first substrate 11.
The display unit 14 is disposed between the exposed first electrode layer 131 and the exposed second electrode layer 133. The exposed first electrode layer 131 is the first electrode layer 131 which is not covered by the first friction layer 132, and the exposed second electrode layer 133 is the second electrode layer 133 which is not covered by the second friction layer 134.
Wherein the first friction layer 132 comprises a magnetostrictive material for performing telescopic movement under the control of an external magnetic field, and is contacted with or separated from the second friction layer 134, and when the first friction layer 132 is contacted with the second friction layer 134, frictional charges are generated; the first electrode layer 131 and the second electrode layer 133 are used for generating a driving current according to frictional charges; the display unit 14 is used for displaying handwriting corresponding to an external magnetic field under the action of the driving current.
Referring to fig. 1, a schematic cross-sectional structure of a first pixel unit is shown, and fig. 2, a schematic cross-sectional structure of a second pixel unit is shown. Each pixel unit in fig. 1 comprises a power supply unit 13 and a display unit 14, and each pixel unit in fig. 2 comprises a power supply unit 13 and two display units 14, namely, a single power supply unit 13 corresponds to two display units 14, and the single power supply unit 13 supplies power for at least two display units 14, so that a plurality of display units can be controlled by a single contact, the effective display area of the writing device can be increased, and the number of power supply units is reduced. It should be noted that, the structure of the pixel units is not limited to that shown in fig. 1 and fig. 2, in practical application, each pixel unit may include at least one power supply unit 13 and at least one display unit 14, and the power supply unit 13 and the display unit 14 may be one-to-many or many-to-one, and so on, and the number correspondence between the power supply unit 13 and the display unit 14 may be determined according to the actual requirement, and other correspondence all belong to the protection scope of the embodiment.
The first substrate 11 and the second substrate 12 may be transparent substrates, and serve as manufacturing substrates for the display unit 14 and the power supply unit 13.
The first electrode layer 131 and the second electrode layer 133 may be made of an electrode material such as ITO (indium tin oxide) as a current signal output channel of the power supply unit 13, and in practical applications, the first electrode layer 131 and the second electrode layer 133 may further include a protective layer, such as an oxidation preventing layer, coated on a surface of the electrode material such as ITO.
The first friction layer 132 is a magnetostrictive structure and may include a base material and magnetostrictive particles filled in the base material. The substrate material may be, for example, polydimethylsiloxane (PDMS), and in this embodiment, a mixture of PDMS and magnetostrictive particles is used as the first friction layer 132, and the material of the magnetostrictive particles may be one or more of rare earth-transition metals, such as Fe-Ca magnetic materials, tbFe2, dyFe2, or SmFe2, so long as the material of the magnetostrictive particles can cause the first friction layer 132 to stretch or change volume under the control of an external magnetic field. In order to increase the amount of friction charge, the first friction layer 132 may further include a ferroelectric compound material, such as barium titanate nanoparticles, filled in the base material.
The second friction layer 134 may be a metal film layer, such as a metal layer of copper, aluminum, or the like. In practical applications, the metal thin film layer may be formed by vapor deposition, and the second friction layer 134 also has the function of an electrode.
The surface of the first friction layer 132 adjacent to the second friction layer 134 and the surface of the second friction layer 134 adjacent to the first friction layer 132 may be planar or the like. In order to increase the effective friction area when the first friction layer 132 is in contact with the second friction layer 134, the surface of the first friction layer 132 adjacent to the second friction layer 134 and/or the surface of the second friction layer 134 adjacent to the first friction layer 132 may have a micro-nano structure, and the amount of charge generated by friction induction may be increased by increasing the effective friction area. Wherein, the micro-nano structure can be formed by adopting a mould casting molding mode.
The power supply unit 13 may further include a buffer layer 135 disposed between the first electrode layer 131 and the first friction layer 132. Buffer layer 135 is provided to facilitate carrier and charge transfer and may generally be a metal nitride layer, such as aluminum nitride or the like.
In order to isolate the power supply unit 13 from the display unit 14, the pixel unit may further include a first support structure 15 disposed between the first electrode layer 131 and the second electrode layer 133, and the first support structure 15 is insulated and may be made of a high polymer. The first support structure 15 may also provide a supporting effect during the power supply process, avoiding interference of the power supply unit during writing to the thickness of the other power supply units and the display unit, and may be made of an elastic polymer.
In order to isolate each pixel unit, each pixel unit may further include a second support structure 16 disposed between the first substrate 11 and the second substrate 12, where the second support structure 16 is insulated and used as a packaging isolation structure for each pixel unit, so as to avoid interference between adjacent pixel units, and the second support structure 16 may be configured as a trapezoid, a column, or other structures, and is prepared by using a photoresist exposure development method.
The display unit 14 may be a liquid crystal display unit, an electrophoretic display unit, or the like, as long as a display device capable of displaying under the action of a driving current is within the scope of the present embodiment. This embodiment will be described with reference to an electrophoretic display unit.
Specifically, the display unit 14 may include a dispersion liquid 141 filled between the first electrode layer 131 and the second electrode layer 133, positively charged first electrophoretic particles 142, and negatively charged second electrophoretic particles 143, wherein the first electrophoretic particles 142 are used to display a dark state, and the second electrophoretic particles 143 are used to display a bright state; alternatively, the first electrophoretic particles 142 are used to display a bright state, and the second electrophoretic particles 143 are used to display a dark state.
As shown in fig. 1 or 2, the display unit includes first electrophoretic particles 142 of black (the material may be carbon black for displaying a dark state), second electrophoretic particles 143 of white (the material may be titanium dioxide, silicon dioxide, or the like for displaying a bright state), and a dispersion 141.
Wherein the electrophoretic particles are particles (polymer or colloid) having the following properties: electrophoresis based on the potential difference is performed in the dispersion liquid 141, and the electrophoresis is moved to a desired electrode side. For example, black pigments such as aniline black and carbon black, white pigments such as titanium dioxide, zinc white, antimony trioxide and alumina, azo pigments such as monoazo, bisazo and polyazo, yellow pigments such as isoindolinone, chrome yellow, yellow iron oxide, cadmium yellow, titanium yellow and antimony, red pigments such as quinacridone red and chrome vermilion, blue pigments such as phthalocyanine blue and indigo blue, anthraquinone dyes, blue pigments such as Prussian blue, ultramarine blue and cobalt blue, green pigments such as phthalocyanine green, and the like.
The dispersion 141 is used to prevent aggregation between the positive and negative electrophoresis particles, and may be an organic solvent such as aromatic hydrocarbon, epoxy compound, halogenated hydrocarbon, aliphatic hydrocarbon, and siloxane. When an electric field is applied, electrophoretic particles with different electrical properties in the dispersion 141 undergo electrophoretic migration; when the electric field is removed, a certain interaction exists between the electrophoretic particles with different electric properties, so that the electrophoretic particles can be maintained in a state before the electric field is removed, and the state is unchanged, thereby realizing bistable display.
The size of the electrophoretic particles may be in the range of 0.1 to 10um, and the polarities of the first electrode layer 131 and the second electrode layer 133 may be changed to move the electrophoretic particles in the display unit to perform display switching.
During writing, the first and second friction layers 132 and 134 in the power supply unit frictionally generate electricity and supply driving current to the display unit through the first and second electrode layers 131 and 133. The triboelectricity generation is a technology for forming induced charges through contact friction of the surface of a film material so as to form feedback current. When two thin film materials are in physical contact, the material with strong electron-withdrawing capability attracts electrons from the material with weak electron-withdrawing capability due to the difference of electric polarities, so that the two contact surfaces are provided with equal amounts of charges with different numbers, namely frictional charges. Once the two film materials are separated under the action of external force, a potential difference is generated between the two contact surfaces. If the back electrodes of the two materials (e.g., the first electrode layer 131 and the second electrode layer 133 in this embodiment) are connected by a load, the potential difference will cause electrons to flow between the two electrodes to balance the electrostatic potential difference between the films. Once the two contact surfaces coincide again, the potential difference created by the triboelectric charges disappears, causing electrons to flow in opposite directions. The power supply unit provided in this embodiment is a self-powered device, which can directly collect micro energy changes from the environment and convert the micro energy changes into electric energy, and is a sustainable and energy-saving scheme.
Referring to fig. 3, a schematic diagram of a cross-sectional structure of a handwriting screen during a writing process is shown. In the writing process, the stylus pen can be used for emitting an external magnetic field and changing the intensity of the external magnetic field, so that the magnetization effect on magnetostrictive particles in the first friction layer 132 is realized, the first friction layer 132 generates volume change, as shown by a dotted line part in fig. 3, magnetostrictive particles in the power supply unit are stimulated by the magnetic field and generate volume deformation, the lower surface of the first friction layer 132 is in friction contact with the upper surface of the second friction layer 134 and generates friction charges, when the stylus pen leaves the power supply unit, the magnetic field disappears, the volume of the first friction layer 132 is reduced, the first friction layer 132 is separated from the second friction layer 134, the first electrode layer 131 is negatively charged, the second electrode layer 133 is positively charged due to the relationship between the polarity of materials and the potential difference, driving current is formed, the magnetostrictive particles are transmitted to the display unit through the first electrode layer 131 and the second electrode layer 133, and charged electrophoretic particles (black first electrophoretic particles are positively charged and white second electrophoretic particles are negatively charged) in the adsorption display unit are formed, and writing display and handwriting is kept.
In the initial state (non-writing state), a certain gap exists between the first friction layer 132 and the second friction layer 134, and the gap size may be set according to the initial film preparation thickness, for example, may be set to 0.5 to 10um. In the writing state, the volume of the first friction layer 132 corresponding to the position of the stylus contact point is changed, and the first friction layer is contacted with the second friction layer 134 to form friction charges and output driving current, so that power supply display is performed on the display unit. The number of the electrophoretic particles adsorbed by the first electrode layer 131 and the second electrode layer 133 in the display unit depends on the magnitude of the driving current (feedback current) of the power supply unit, and the power supply unit of the embodiment can realize different feedback currents according to the magnitude of the external magnetic field, so that the thickness adjustment of the handwriting can be realized and the definition of the writing handwriting can be improved.
The first friction layer 132 may further include 20wt% barium titanate nanoparticles filled in the base material, such that a driving voltage of 10 to 15V (-10 to 15V) and 10 to 25. Mu.A/cm can be achieved 2 The driving current density, the driving voltage and the driving current value can ensure the movement and the adsorption of the electrophoretic particles.
Referring to fig. 4, a schematic diagram of a cross-sectional structure of a handwriting screen in the process of forming handwriting is shown. When the handwriting pen starts to write on the handwriting screen, the material in the first friction layer 132 at the corresponding position generates a magnetization effect, the volume expands, the material contacts with the second friction layer 134 and generates power by nano friction, the handwriting pen is moved, and the handwriting pen passing area can generate power by friction between the first friction layer 132 and the second friction layer 134 at the corresponding position, so that handwriting display and maintenance are realized. Referring to fig. 5, a writing diagram displayed on a handwriting screen is shown.
Referring to fig. 6, a schematic diagram of a cross-sectional structure of a handwriting screen in another writing process is shown. Compared with fig. 3, the broken line portion in fig. 6 shows that a low-intensity external magnetic field is adopted, at this time, the frictional charge generated between the first friction layer 132 and the second friction layer 134 is less, the power supply unit forms a smaller feedback current, and the feedback current is transmitted to the upper electrode layer and the lower electrode layer in the display unit, so that the adsorbed electrophoretic particles are less (black particles in the figure), and finer writing is obtained. Therefore, different display modes can be realized by changing the magnitude of the external magnetic field.
When the handwriting is displayed on the handwriting screen, an external magnetic field can be applied to the handwriting screen to erase the handwriting. For example, the stylus pen can be used to pass through the handwriting area again, and the magneto-nano friction process is triggered again, at this time, since the first friction layer 132 and the second friction layer 134 are both charged, the opposite charges are formed after the contact friction again, that is, the first electrode layer 131 is positively charged and the second electrode layer 133 is negatively charged. The polarities of the upper electrode layer and the lower electrode layer of the display unit are changed, and positively charged black particles reversely move and repel to the lower part of negatively charged white particles according to the principle of homopolar attraction, so that handwriting erasing is realized. The technical proposal can realize the function of local erasure, and has simple method and easy realization.
Referring to fig. 7, a schematic plan view of a handwriting screen having a first pixel cell structure is shown. The handwriting screen comprises a plurality of pixel units which are arranged in an array mode, wherein each pixel unit comprises a display unit 14 and a power supply unit 13. The pixel units are isolated and packaged by adopting a second supporting structure 16, and the display unit 14 and the power supply unit 13 are isolated by adopting a first supporting structure 15.
According to the handwriting screen provided by the embodiment, the first friction layer in the power supply unit stretches under the control of the external magnetic field, the volume changes, friction charges are generated when the volume of the first friction layer increases to be in contact with the second friction layer, and then the first electrode layer and the second electrode layer output driving current to the display unit according to the friction charges, and the display unit displays handwriting corresponding to the external magnetic field. The application adopts a non-contact external magnetic field to realize handwriting writing, so that the pressure touch type handwriting pen can be prevented from damaging a screen, and the application supplies power to the display unit through the power supply unit of the application, and a power supply device is not required to be additionally arranged, so that the integration of the magnetically induced power supply unit and the display unit is realized, the self-powered display can be realized, and the portability of the handwriting device is improved.
The handwriting screen provided by the embodiment has the functions of self power supply, writing track display, local erasing and the like. Based on magnetization phenomenon of magnetostrictive material under magnetic field environment and then leads to expansion of self length and change of volume, trigger the first friction layer in the power supply unit and the friction of second friction layer contact, realize that the magnetic control generates electricity, form drive current and transmit to the display element through the electrode layer, display writing by the display element and keep. The magnetostriction intensity is controlled according to the strength of an external magnetic field to form different driving currents, so that handwriting thickness can be realized, and local erasure can be realized when handwriting is performed again.
Another embodiment of the present application provides a handwriting pen, which can be applied to the handwriting screen described in any of the foregoing embodiments, referring to fig. 8, the handwriting pen may include a magnetic field emitting device 81 and a magnetic field adjusting device 82, where the magnetic field adjusting device 82 is configured to adjust the intensity of the magnetic field emitted by the magnetic field emitting device 81 according to an external input instruction.
In a specific implementation, the magnetic field emission device 81 may be disposed inside the pen body, and the magnetic field adjustment device 82 may be an external knob on the stylus pen.
When the magnetic field adjusting device 82 is a knob externally arranged on the handwriting pen, the external input instruction can be the rotation operation of the user on the knob, so that the user can adjust the intensity of the magnetic field emitted by the magnetic field emitting device 81 through the magnetic field adjusting device 82, change the intensity of the external magnetic field applied on the handwriting screen, realize the magnetization effect on the first friction layer of the handwriting screen, enable the first friction layer to change in volume, and further generate electricity through friction with the second friction layer.
To increase the handwriting-erasing area, this can be achieved by increasing the area of the magnetic field emission means 81, so that the magnetic field emission means 81 can be arranged inside a thicker cap (as shown in fig. 8) or inside the pen body.
Another embodiment of the present application provides a handwriting device, referring to fig. 9, where the handwriting device includes a handwriting screen according to any embodiment and a handwriting pen according to any embodiment.
The handwriting device provided by the embodiment can realize self-power, handwriting maintenance and local erasing functions, has a simple structure and is easy to realize, can be widely applied to the field of electronic writing boards, and belongs to the cross fusion of a sensing device and a display technology.
Another embodiment of the present application provides a method for manufacturing a handwriting screen, the handwriting screen including a first substrate and a second substrate disposed opposite to each other, and a plurality of pixel units disposed between the first substrate and the second substrate, each pixel unit including a power supply unit and a display unit, referring to fig. 10, the method for manufacturing each pixel unit includes:
step 1001: and sequentially forming a first electrode layer and a first friction layer on the first substrate to obtain a first substrate, wherein the first friction layer is positioned in a region corresponding to the power supply unit.
The first substrate may be a transparent substrate.
Specifically, a first electrode layer may be formed on a first substrate first; and then sequentially forming a buffer layer and a first friction layer on the first electrode layer in a region corresponding to the power supply unit to obtain a first substrate.
The first electrode layer may be formed using a patterning process.
The first friction layer can be formed through a film pressing forming process, and can be formed through the film pressing forming process in a vacuum environment, and after the film pressing forming process is formed, solidification is carried out under the protection of argon, so that the quality and the reliability of the formed magnetostrictive material layer can be improved. In the embodiment, fe-Ca magnetic material particles are selected, a PDMS base material is mixed, an ion beam sputtering deposition method is adopted, a steady magnetic field is applied, the magnetic field strength is 50-100 mT, a film with the thickness of 0.1-5 mu m can be prepared, and the magnetostriction coefficient range can be 50-200 ppm according to the steady magnetic field strength.
Referring to fig. 11a, a schematic cross-sectional structure of the completed first substrate is shown.
Step 1002: a second electrode layer is formed on the second substrate.
The second substrate may be a transparent substrate.
The second electrode layer may be formed using a patterning process.
In a specific implementation, after the second electrode layer is manufactured, the method may further include: a first support structure is formed on the second electrode layer, the first support structure being insulated for isolating the power supply unit from the display unit.
The first support structure is made of an insulating material, such as a high molecular polymer, on the second electrode layer, and can be made by a transfer printing method or a photoresist exposure developing method.
Step 1003: a second friction layer is formed on the second electrode layer in a region corresponding to the power supply unit.
In particular, the second friction layer may be prepared between the first support structures by vacuum evaporation, for example using copper, aluminium metal materials.
Step 1004: and forming a display unit on the exposed second electrode layer to obtain a second substrate.
In a specific implementation, step 1004 may further include: a second support structure is formed on the second substrate, the second support structure being insulated for isolating the pixel cells.
The second support structure can be prepared by a photoresist exposure and development mode.
Specifically, a dispersion liquid, positively charged first electrophoretic particles for displaying a dark state, and negatively charged second electrophoretic particles for displaying a bright state may be formed on the exposed second electrode layer in a region between the first support structure and the second support structure; alternatively, the first electrophoretic particles are used to display a bright state and the second electrophoretic particles are used to display a dark state.
Referring to fig. 11b, a schematic cross-sectional structure of the completed second substrate is shown.
Step 1005: pairing the first substrate and the second substrate to obtain a pixel unit, wherein the display unit is positioned between the exposed first electrode layer and the exposed second electrode layer; the first friction layer comprises a magnetostrictive material and is used for performing telescopic movement under the control of an external magnetic field, contacting or separating with the second friction layer, and generating friction charges when the first friction layer contacts with the second friction layer; the first electrode layer and the second electrode layer are used for generating driving current according to friction charges; the display unit is used for displaying handwriting corresponding to the external magnetic field under the action of the driving current.
And after the first substrate and the second substrate are paired, the whole handwriting screen is packaged, and the thickness of the whole handwriting screen can be between 0.5 and 1 mm.
By adopting the preparation method provided by the embodiment, the handwriting screen in any embodiment can be prepared.
Another embodiment of the present application provides a method for controlling a handwriting screen, referring to fig. 12, the method may include:
step 1201: the first friction layer performs telescopic movement under the control of an external magnetic field and is contacted with or separated from the second friction layer, and when the first friction layer is contacted with the second friction layer, friction charges are generated.
Step 1202: the first electrode layer and the second electrode layer generate driving current according to frictional charge.
Step 1203: the display unit displays handwriting corresponding to the external magnetic field under the action of the driving current.
The control method provided in this embodiment may be applied to the handwriting screen described in any of the foregoing embodiments, and specific control principles and working processes are described in detail in the handwriting screen embodiment, which is not described herein.
Another embodiment of the present application provides a control method of a stylus pen, referring to fig. 13, the control method includes:
step 1301: and receiving an external input instruction.
Specifically, this step may be performed by the magnetic field adjusting means 82.
Step 1302: and according to an external input instruction, adjusting the intensity of a magnetic field emitted by the handwriting pen.
Specifically, this step may be performed by the magnetic field emission device 81.
The control method provided in this embodiment may be applied to the stylus described in any one of the above embodiments, and specific control principles and working processes are described in detail in the stylus embodiments and are not described herein.
Another embodiment of the present application provides a control method of a handwriting device, referring to fig. 14, the control method includes:
step 1401: the handwriting pen receives a first external input instruction.
Step 1402: the handwriting pen adjusts the intensity of the first magnetic field emitted by the handwriting pen according to the first external input instruction.
Step 1403: the first friction layer performs telescopic movement under the control of the first magnetic field and is contacted with or separated from the second friction layer, and when the first friction layer is contacted with the second friction layer, first friction charges are generated.
Step 1404: the first electrode layer and the second electrode layer generate a first driving current according to the first friction charge.
Step 1405: the display unit displays handwriting corresponding to the first magnetic field under the action of the first driving current.
In one implementation, when the handwriting is displayed on the handwriting screen, referring to fig. 15, the control method further includes:
step 1501: the stylus receives a second external input instruction.
Step 1502: and regulating the intensity of the second magnetic field emitted by the handwriting pen according to the second external input instruction.
Step 1503: the first friction layer performs telescopic movement under the control of the second magnetic field, contacts with or separates from the second friction layer, and generates second friction charges when the first friction layer contacts with the second friction layer.
Step 1504: the first electrode layer and the second electrode layer generate a second driving current according to the second friction charge.
Step 1505: the display unit erases the writing trace under the action of the second driving current.
Referring to fig. 16, a flowchart of a control method of a handwriting device is shown. Firstly, starting a handwriting process by starting an electromagnetic handwriting pen, controlling a magnetic field emission device to emit different magnetic field intensities by a magnetic field adjusting device in the handwriting pen, controlling the volume change of a first friction layer in a power supply unit, forming a driving current by friction with a second friction layer, transmitting the driving current to a display unit through a first electrode layer and a second electrode layer, and adsorbing electrophoresis particles (the diameter of the electrophoresis particles is 0.1-10 um) according to the polarity and the direction to form and hold the handwriting. When the handwriting pen performs electromagnetic writing along the original handwriting again, reverse charges are generated at the moment and transmitted to the display unit, the electrophoresis particles move reversely, and the original handwriting is erased.
The control method provided in this embodiment may be applied to the handwriting device described in any of the above embodiments, and specific control principles and working processes are described in detail in the handwriting screen and handwriting pen embodiments, which are not described herein again.
According to the technical scheme, the self-powered writing display and the local erasing function can be realized, the magneto friction power generation is effectively utilized to supply power to the display unit, no additional power supply is needed, the writing display and the writing maintenance can be realized through the built-in power supply unit, the local erasing function can be realized through the magneto touch control again, the limitations of the traditional pressure induction type and the additional power supply unit are reduced, and the technical proposal has a simple structure and is easy to manufacture.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The invention provides a handwriting screen, a handwriting pen, a handwriting device, a control method and a preparation method thereof, and specific examples are applied to illustrate the principle and the implementation of the invention, and the illustration of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (17)
1. A handwriting screen, comprising a first substrate and a second substrate which are oppositely arranged, and a plurality of pixel units arranged between the first substrate and the second substrate, wherein each pixel unit comprises a power supply unit and a display unit;
the power supply unit comprises a first electrode layer and a first friction layer which are arranged on the first substrate in a stacked manner, and a second electrode layer and a second friction layer which are arranged on the second substrate in a stacked manner, wherein the first friction layer is arranged close to the second substrate, and the second friction layer is arranged close to the first substrate;
the display unit is arranged between the exposed first electrode layer and the exposed second electrode layer;
the first friction layer comprises a magnetostrictive material and is used for performing telescopic movement under the control of an external magnetic field, contacting with or separating from the second friction layer, and generating friction charges when the first friction layer contacts with the second friction layer; the first electrode layer and the second electrode layer are used for generating driving current according to the friction charges; the display unit is used for displaying handwriting corresponding to the external magnetic field under the action of the driving current.
2. A handwriting screen according to claim 1 wherein said first friction layer comprises a substrate and magnetostrictive particles filled in said substrate.
3. A handwriting screen according to claim 2 wherein said first friction layer further comprises barium titanate nanoparticles filled in said substrate.
4. A handwriting screen according to claim 1 wherein said second friction layer is a metallic film layer.
5. A handwriting screen according to claim 1 wherein the surface of the first friction layer adjacent to the second friction layer and/or the surface of the second friction layer adjacent to the first friction layer has micro-nanostructures.
6. The handwriting screen according to claim 1, wherein the display unit comprises a dispersion filled between the first electrode layer and the second electrode layer, positively charged first electrophoretic particles and negatively charged second electrophoretic particles,
wherein the first electrophoretic particles are used for displaying dark states and the second electrophoretic particles are used for displaying bright states; alternatively, the first electrophoretic particles are used to display a bright state and the second electrophoretic particles are used to display a dark state.
7. The handwriting screen according to any of claims 1 to 6, wherein the power supply unit further comprises a buffer layer arranged between the first electrode layer and the first friction layer.
8. A handwriting screen according to any of claims 1-6, wherein each pixel cell further comprises a first support structure arranged between the first electrode layer and the second electrode layer, the first support structure being insulated for isolating the power supply unit from the display unit.
9. The handwriting screen according to any of claims 1-6, wherein each pixel cell further comprises a second support structure arranged between the first substrate and the second substrate, the second support structure being insulated for isolating each pixel cell.
10. A handwriting device, characterized in that it comprises a handwriting screen according to any of claims 1 to 9 and a handwriting pen acting on the handwriting screen.
11. A method for manufacturing a handwriting screen, wherein the handwriting screen comprises a first substrate and a second substrate which are oppositely arranged, and a plurality of pixel units arranged between the first substrate and the second substrate, wherein each pixel unit comprises a power supply unit and a display unit; the preparation method of each pixel unit comprises the following steps:
Sequentially forming a first electrode layer and a first friction layer on the first substrate to obtain a first substrate, wherein the first friction layer is positioned in a region corresponding to the power supply unit;
forming a second electrode layer on the second substrate;
forming a second friction layer on the second electrode layer in a region corresponding to the power supply unit;
forming the display unit on the exposed second electrode layer to obtain a second substrate;
pairing the first substrate and the second substrate to obtain the pixel unit, wherein the display unit is positioned between the exposed first electrode layer and the exposed second electrode layer;
the first friction layer comprises a magnetostrictive material and is used for performing telescopic movement under the control of an external magnetic field, contacting with or separating from the second friction layer, and generating friction charges when the first friction layer contacts with the second friction layer; the first electrode layer and the second electrode layer are used for generating driving current according to the friction charges; the display unit is used for displaying handwriting corresponding to the external magnetic field under the action of the driving current.
12. The method of manufacturing according to claim 11, wherein the step of sequentially forming a first electrode layer and a first friction layer on the first substrate to obtain a first substrate includes:
Forming a first electrode layer on the first substrate;
and forming a buffer layer and a first friction layer on the first electrode layer in sequence in a region corresponding to the power supply unit to obtain a first substrate.
13. The method of manufacturing according to claim 11, characterized by further comprising, after the step of forming a second electrode layer on the second substrate, before the step of forming a second friction layer on the second electrode layer in a region corresponding to the power supply unit:
a first support structure is formed on the second electrode layer, the first support structure being insulated for isolating the power supply unit from the display unit.
14. The method of manufacturing according to claim 13, further comprising, before the step of forming the display unit on the exposed second electrode layer:
forming a second support structure on the second substrate, wherein the second support structure is insulated and is used for isolating each pixel unit;
the step of forming the display unit on the exposed second electrode layer includes:
forming a dispersion, positively charged first electrophoretic particles for displaying a dark state, and negatively charged second electrophoretic particles for displaying a bright state on the second electrode layer in a region between the first support structure and the second support structure; alternatively, the first electrophoretic particles are used to display a bright state and the second electrophoretic particles are used to display a dark state.
15. A control method of a handwriting screen, applied to the handwriting screen according to any one of claims 1 to 9, the control method comprising:
the first friction layer stretches and contracts under the control of an external magnetic field and is contacted with or separated from the second friction layer, and friction charges are generated when the first friction layer is contacted with the second friction layer;
the first electrode layer and the second electrode layer generate driving current according to the friction charges;
the display unit displays handwriting corresponding to the external magnetic field under the action of the driving current.
16. A control method of a handwriting device, applied to the handwriting device of claim 10, the control method comprising:
the handwriting pen receives a first external input instruction;
the handwriting pen adjusts the intensity of a first magnetic field emitted by the handwriting pen according to the first external input instruction;
the first friction layer performs telescopic movement under the control of the first magnetic field and is contacted with or separated from the second friction layer, and when the first friction layer is contacted with the second friction layer, a first friction charge is generated;
the first electrode layer and the second electrode layer generate a first driving current according to the first friction charge;
The display unit displays handwriting corresponding to the first magnetic field under the action of the first driving current.
17. The control method according to claim 16, wherein when writing is displayed on the handwriting screen, the control method further comprises:
the handwriting pen receives a second external input instruction;
the handwriting pen adjusts the intensity of a second magnetic field emitted by the handwriting pen according to the second external input instruction;
the first friction layer performs telescopic movement under the control of the second magnetic field and is contacted with or separated from the second friction layer, and when the first friction layer is contacted with the second friction layer, second friction charges are generated;
the first electrode layer and the second electrode layer generate a second driving current according to the second friction charge;
the display unit erases the writing trace under the action of the second driving current.
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| CN111403445B (en) * | 2020-03-23 | 2023-04-18 | 京东方科技集团股份有限公司 | Display panel and manufacturing method thereof |
| CN112782901B (en) * | 2021-01-28 | 2024-04-02 | 福州大学 | Self-powered nonvolatile display device |
| CN113075830A (en) * | 2021-04-15 | 2021-07-06 | 合肥京东方卓印科技有限公司 | Magnetic handwriting screen and manufacturing method thereof |
| CN113552971B (en) * | 2021-08-11 | 2024-01-23 | 京东方科技集团股份有限公司 | Liquid crystal handwriting board system and erasing method |
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