CN111367106A - Handwriting film with color freely changing along with position and electronic writing equipment - Google Patents
Handwriting film with color freely changing along with position and electronic writing equipment Download PDFInfo
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- CN111367106A CN111367106A CN202010143586.2A CN202010143586A CN111367106A CN 111367106 A CN111367106 A CN 111367106A CN 202010143586 A CN202010143586 A CN 202010143586A CN 111367106 A CN111367106 A CN 111367106A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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Abstract
The invention provides a handwriting film with colors freely changing along with positions and electronic writing equipment, and relates to the technical field of liquid crystal handwriting films. The handwriting film with the color freely changing along with the position comprises a first electrode layer, a second electrode layer and a liquid crystal layer; in at least one part of the area of the handwriting film, at least two different types of cholesteric liquid crystals are mixed at the same position in the liquid crystal layer, wherein the mass percentages of at least two types of cholesteric liquid crystals are changed along with the position of the handwriting film, and the central reflection wavelengths of the different cholesteric liquid crystals are different. The electronic writing device of the invention comprises a control circuit and the handwriting film with the color freely changing with the position. The handwriting film and the electronic writing equipment with the color freely changing along with the position can solve the technical problems that the existing liquid crystal handwriting board can not display abundant colors and can not display various color changes.
Description
Technical Field
The invention relates to the technical field of liquid crystal handwriting films, in particular to a handwriting film with colors freely changing along with positions and electronic writing equipment.
Background
In the prior art, the liquid crystal handwriting board is often manufactured by utilizing the characteristic that the cholesteric bistable liquid crystal can maintain the display without continuously supplying power. The Zizizi phase liquid crystal has two stable states of FC state and P state. When the cholesteric liquid crystal is in the FC state, the liquid crystal handwriting board is in a transparent state in appearance; when the cholesteric liquid crystal is in a P state under the action of pressure, light with a fixed wavelength can be reflected, so that the liquid crystal handwriting board can display handwriting. As the FC state and the P state of the cholesteric liquid crystal can be maintained for a long time without voltage, the energy consumption of the liquid crystal handwriting board is extremely low.
The cholesteric liquid crystal is prepared from nematic liquid crystal and chiral agents, has selective reflection on incident light, and can display different colors on a handwriting board. In order to display multiple colors on the same handwriting board, at present, a mode of dividing different areas in the same handwriting board is adopted, and cholesteric liquid crystals capable of displaying different colors are correspondingly configured in each area, so that different areas of the same handwriting board can display different colors. For example, a plurality of rectangular areas are marked on the handwriting board, each rectangular area is made of a different cholesteric liquid crystal material, and different colors are displayed in different rectangular areas.
Although the liquid crystal handwriting board can display a plurality of colors in the same handwriting board, only a single color can be fixedly displayed in the same area of the handwriting board, obvious block segmentation is formed between different colors, the change of the color is fixed and too single, and the colors which can be presented by the handwriting board are very limited.
Disclosure of Invention
In view of the above, the present invention provides a handwriting film and an electronic writing device, which can freely change colors with positions, and solve the technical problems that the existing liquid crystal handwriting board can not display abundant colors and can not display various color changes.
In a first aspect, the present invention provides a handwriting film with a color freely changing with position, including a first electrode layer, a second electrode layer and a liquid crystal layer, wherein the first electrode layer and the second electrode layer are oppositely disposed, the liquid crystal layer is located between the first electrode layer and the second electrode layer, and the liquid crystal layer includes a cholesteric liquid crystal and an adhesive;
in at least one part of the area of the handwriting film, at least two different types of cholesteric liquid crystals are mixed at the same position in the liquid crystal layer, the mass percentages of at least two types of cholesteric liquid crystals are changed along with the position of the handwriting film, and the central reflection wavelengths of the different cholesteric liquid crystals are different.
Preferably, the cholesteric liquid crystal comprises: a first cholesteric liquid crystal with the central reflection wavelength range of 420-480 nm and a second cholesteric liquid crystal with the central reflection wavelength of 600 nm.
Preferably, the first cholesteric liquid crystal comprises a nematic liquid crystal with delta n of 0.3, a first chiral agent S811 and a second chiral agent S5011, and the mass percentages of the nematic liquid crystal, the first chiral agent S811 and the second chiral agent S5011 are 80% -92%, 17% -19.9% and 0.1% -3%, respectively.
Preferably, the second cholesteric liquid crystal comprises a nematic liquid crystal with an n of 0.3, a first chiral agent S811 and a third chiral agent S2011, and the mass percentages of the nematic liquid crystal, the first chiral agent S811 and the third chiral agent S2011 are respectively 80%, 11% and 9%.
Preferably, the cholesteric liquid crystal comprises a first cholesteric liquid crystal and a second cholesteric liquid crystal, the first cholesteric liquid crystal having a central reflection wavelength of λ1The central reflection wavelength lambda of the second cholesteric liquid-crystal phase2Let d be | λ1-λ2|，d≥80nm。
Preferably, the mass percentage of the various types of cholesteric liquid crystals varies randomly with the position of the handwriting film.
Preferably, the mass percentages of the at least two cholesteric liquid crystals vary randomly along the first direction of the writing film.
Preferably, the mass percentages of the at least two cholesteric liquid crystals are randomly changed simultaneously in at least two directions of the writing film.
Preferably, still include the relative transparent substrate layer and the ground colour substrate layer that set up, transparent basic level is in the one side that first electrode layer deviates from the liquid crystal layer, ground colour substrate level is in the one side that the second electrode layer deviates from the liquid crystal layer.
In a second aspect, the present invention provides an electronic writing device comprising a control circuit for applying a voltage signal to the first electrode layer and the second electrode layer to switch the liquid crystal layer between the FC state and the P state, and the writing film of the first aspect whose color varies freely with position.
Has the advantages that: the handwriting film and the electronic writing equipment with the color freely changing along with the position mix various cholesteric liquid crystals capable of displaying different colors to the same position of the handwriting film, so that the position can display the color effect generated by the combined action of the various cholesteric liquid crystals after mixing, and the color displayed at the position is related to the mass percentage of various cholesteric liquid crystals. Along with the constant change of the mass percentages of various cholesteric liquid crystals, the displayed color of the handwriting film also changes continuously, so that the handwriting film can display richer colors. Moreover, the mass percentages of various cholesteric liquid crystals in the invention are constantly changed along with the position of the writing board, so that a user can see more abundant colors and also more abundant color changes in the same area of the handwriting board or the whole handwriting board.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.
FIG. 1 is a diagram illustrating an effect graph of colors displayed on a handwriting film according to the prior art;
FIG. 2 is a schematic structural diagram of a handwriting film according to the present invention;
FIG. 3 is a diagram showing the effect of the handwriting film after red and blue liquid crystal materials are mixed;
FIG. 4 is a diagram showing the effect of the handwriting film after yellow and blue liquid crystal materials are mixed;
FIG. 5 is a schematic structural diagram of an apparatus for manufacturing a liquid crystal handwriting film according to the present invention;
FIG. 6 is a schematic structural diagram of a liquid crystal material filling apparatus according to the present invention;
FIG. 7 is a schematic structural diagram of a liquid crystal material filling apparatus with a valve according to the present invention;
FIG. 8 is a schematic structural diagram of a liquid crystal material filling apparatus with a first driving device according to the present invention;
FIG. 9 is a schematic structural view of an apparatus for manufacturing a liquid crystal handwriting film with a first driving device according to the present invention;
FIG. 10 is a schematic view of the present invention showing a structure of changing the position of the filling opening of the liquid crystal material by rotation;
FIG. 11 is a schematic structural diagram of an apparatus for manufacturing a liquid crystal writing film with an ultraviolet curing device according to the present invention;
fig. 12 is a schematic structural diagram of a liquid crystal handwriting film manufacturing device of a discharging device and a winding mechanism of the invention.
Parts and numbering in the drawings: the device comprises a first electrode layer 1, a second electrode layer 2, a liquid crystal layer 3, a transparent substrate layer 4, a ground color substrate layer 5, a laminating device 10, a first pressing roller 11, a second pressing roller 12, a laminating gap 13, a first material layer 21, a second material layer 22, a liquid crystal material perfusion device 30, a conveying runner 31, a mixing runner 32, a liquid crystal material perfusion opening 33, a valve 34, a first driving device 35, an ultraviolet curing device 40, a first discharging device 50, a second discharging device 60 and a winding mechanism 70.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is noted that, herein, relational terms such as first and second, and the like may be 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. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Also, 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In case of conflict, the embodiments of the present invention and various features of the embodiments may be combined with each other within the scope of the present invention.
The liquid crystal writing board is generally composed of a shell material, a control circuit board and a writing film. The handwriting film is respectively a transparent film, a first layer of ITO transparent electrode, a liquid crystal layer 3, a first layer of ITO transparent electrode and a black bottom film from top to bottom. The liquid crystal layer 3 contains cholesteric liquid crystal prepared from nematic liquid crystal and a chiral agent.
The handwriting film can be prepared by filling a mixed monomer or prepolymer which can be polymerized under an external field (such as light, heat and the like), liquid crystal and a related liquid crystal composition (liquid crystal material added with a chiral agent) between two base materials with conductive layers, wherein the components and the proportion of the liquid crystal composition can adjust the central reflection wavelength of the cholesteric liquid crystal.
The cholesteric liquid crystals are arranged in layers, and the molecules in the layers are parallel to each other. When the cholesteric liquid crystal is in a focal conic texture (FC) state, the molecular long axis of the cholesteric liquid crystal is vertical to the plane of the layers, and the directions of the molecular long axes of different layers are slightly changed; when the cholesteric liquid crystal is in a planar texture state (P state), the long axis of the molecules is parallel to the plane of the layer, and the long axes of the molecules of different layers are slightly changed, so that the long axes are arranged into a spiral structure along the normal direction of the layer. In the FC state, light rays directly pass through the liquid crystal layer 3 and are absorbed by the black film at the lowest layer, and the complete black state is presented; when a finger or other hard objects press the liquid crystal film, the liquid crystal is extruded and overturned by pressure, the overturned area is in a P state, when natural light irradiates the overturned area of the liquid crystal layer 3, light with certain wavelength is reflected, and other colors are absorbed to form corresponding color handwriting; when a clear key on the handwriting board is pressed, the control circuit conducts power on the diaphragm, and the overturned area is stimulated by voltage to recover to the FC state. The FC state and the P state are the aforementioned bistable states, and the conversion between the FC state and the P state can be realized by the driving voltage.
As shown in fig. 1, (different hatching in fig. 1 indicates different colors) because different chiral agents and nematic liquid crystals are mixed to prepare cholesteric liquid crystals reflecting light of different wavelengths, in the prior art, cholesteric liquid crystals prepared from different chiral agents are poured into different areas of the same handwriting board, so that each area marked out by the handwriting board can display different colors, but the colors displayed by the method are limited, and only single colors displayed by each cholesteric liquid crystal can jump, and the color change is monotonous. The following examples of the present invention show richer colors and richer color variations in the same region using a cholesteric liquid crystal prepared by mixing a plurality of chiral agents.
Example 1:
as shown in fig. 2, the handwriting film with color changing freely with position in this embodiment includes a first electrode layer 1, a second electrode layer 2 and a liquid crystal layer 3, the first electrode layer 1 and the second electrode layer 2 are disposed opposite to each other, the liquid crystal layer 3 is disposed between the first electrode layer 1 and the second electrode layer 2, and the liquid crystal layer 3 includes a cholesteric liquid crystal and an adhesive;
in at least a part of the area of the handwriting film, at least two different types of cholesteric liquid crystals are mixed in the same position of the liquid crystal layer 3, and at least the mass percentages of the two cholesteric liquid crystals change along with the position of the handwriting film, and the central reflection wavelengths of the different cholesteric liquid crystals are different.
In this embodiment, the first electrode layer 1 and the second electrode layer 2 are used as electrodes. If the first electrode layer 1 and the second electrode layer 2 are electrified, a certain voltage is generated between the first electrode layer 1 and the second electrode layer 2, and an electric field with certain intensity can be formed between the first electrode layer 1 and the second electrode layer 2. The liquid crystal molecules in the liquid crystal layer 3 can be changed from the P state to the FC state by the electric field. Wherein the first electrode layer 1 and the second electrode layer 2 can be made of transparent electrodes such as ITO electrodes. The adhesive can be ultraviolet light curing adhesive.
Wherein at least two different types of cholesteric liquid crystals are mixed in the same location in the liquid crystal layer 3 in at least a part of the area of the handwriting film. The at least one part of the area may be only a part of the handwriting film, may also include all areas of the handwriting film, may be a continuous area, may also be a plurality of independent areas, may be specified according to specific application requirements, and is not limited herein.
In addition, the handwriting film in this embodiment may further include a transparent substrate layer 4 and a ground color substrate layer which are arranged relatively, the transparent base layer is located on one side of the first electrode layer 1 departing from the liquid crystal layer 3, and the ground color substrate layer is located on one side of the second electrode layer 2 departing from the liquid crystal layer 3. The transparent substrate layer 4 and the ground color substrate layer can be made of a PET film or a PC film. When the courage is brilliant in the FC attitude, light passes through transparent substrate layer 4, shines the primary color substrate layer behind first transparent electrode and the liquid crystal layer 3, and at this moment the user can only see the color of primary color substrate layer, and light is absorbed by the primary color substrate layer when the primary color substrate layer is black, and consequently the user sees black membrane of writing by hand. Besides black, the base color substrate layer can be made of other color materials.
Different types of cholesteric liquid crystals in the application refer to cholesteric liquid crystals with different central reflection wavelengths, and after a single chiral agent and a nematic liquid crystal are prepared according to a fixed proportion, cholesteric liquid crystals with different central reflection wavelengths can be formed, so that a handwriting film can display a single color. In this embodiment, a plurality of cholesteric liquid crystals which originally can only display one color are mixed at the same position of the handwriting film, so that the position can display a color effect of the combined action of the mixed cholesteric liquid crystals, and the color displayed at the position is related to the mass percentages of the cholesteric liquid crystals. As shown in fig. 3 and fig. 4, as the mass percentage of the various cholesteric liquid crystals changes continuously, the color displayed by the handwriting film also changes continuously, so that the color displayed by the handwriting film of this embodiment is far richer than the color displayed by the independent action of the various cholesteric liquid crystals. In addition, in this embodiment, the mass percentages of the various cholesteric liquid crystals change with the position of the writing board, so that the user can see not only richer colors but also richer color changes in the same area of the handwriting board or on the whole handwriting board.
Example 2
In this embodiment, two cholesteric liquid crystals are taken as an example to describe the handwriting film of the present application. In this embodiment, the cholesteric liquid crystal includes a first cholesteric liquid crystal having a central reflection wavelength range of 420-480 nm and a second cholesteric liquid crystal having a central reflection wavelength of 600 nm;
the first cholesteric liquid crystal comprises a nematic liquid crystal with delta n of 0.3, a first chiral agent S811 and a second chiral agent S5011, and the nematic liquid crystal, the first chiral agent S811 and the second chiral agent S5011 respectively account for 80-92% by mass, 17-19.9% by mass and 0.1-3% by mass;
the second cholesteric liquid crystal comprises a nematic liquid crystal with delta n being 0.3, a first chiral agent S811 and a third chiral agent S2011, and the nematic liquid crystal, the first chiral agent S811 and the third chiral agent S2011 respectively account for 80%, 11% and 9% in mass percentage.
For example, when the first cholesteric liquid crystal is acted alone, the handwriting film only shows yellow, and the corresponding central reflection wavelength is 580 nm; when the second cholesteric liquid crystal acts alone, the handwriting film only displays blue, the corresponding central reflection wavelength is 420nm, and when the first cholesteric liquid crystal and the second cholesteric liquid crystal are mixed at the same position of the handwriting film and act simultaneously, the handwriting film can display the color with the central reflection wavelength between 420nm and 580 nm. As shown in fig. 4, as the mass percentages of the first and second cholesteric liquid crystals change, the colors that can be displayed on the handwriting film also change continuously between the wavelengths, thereby displaying various colors between yellow and blue.
The two different cholesteric liquid crystals in this embodiment may also be cholesteric liquid crystals displaying other colors when acting alone, such as a cholesteric liquid crystal displaying green and a cholesteric liquid crystal displaying red, or a cholesteric liquid crystal displaying green and a cholesteric liquid crystal displaying blue, and the specific type of cholesteric liquid crystal may be selected as desired, and is not limited herein. For example, the blue-wave central reflection wavelength is 420 to 480nm, the nematic liquid crystal Δ n is 0.3, the nematic liquid crystal ratio is 80% or more, the ratio of the chiral agent S811 added is 17 to 19.9%, and the ratio of the chiral agent S5011 added is 0.1 to 3%.
As a preferred embodiment, the cholesteric liquid-crystal comprises a first cholesteric liquid-crystal having a central reflection wavelength of λ1A central reflection wavelength lambda reflected by the second cholesteric liquid-crystal phase2Let d be | λ1-λ2L and d is more than or equal to 80 nm. When the wave band between the two cholesteric liquid crystals meets the range, the color difference change of the handwriting film manufactured by the method is more abundant.
Example 3
In this embodiment, three different cholesteric liquid crystals are mixed at the same position to achieve more color display and more color change.
In this embodiment, the Zi-phase liquid crystal includes a first Zi-phase liquid crystal, a second Zi-phase liquid crystal and a third Zi-phase liquid crystal;
the first cholesteric liquid crystal is cholesteric liquid crystal with central reflection wavelength of 480nm, so that the handwriting color of the handwriting board is blue, the nematic liquid crystal proportion of which delta n is 0.3 is 80%, the addition proportion of the chiral agent S811 is 19.6%, and the addition proportion of the chiral agent S5011 is 0.4%.
The second cholesteric liquid crystal is cholesteric liquid crystal with central reflection wavelength of 520nm, so that the handwriting color of the handwriting board is green, the nematic liquid crystal proportion of which delta n is 0.3 is 80%, the addition proportion of the chiral agent S811 is 19.85%, and the addition proportion of the chiral agent S5011 is 0.15%.
The third cholesteric liquid crystal is cholesteric liquid crystal with central reflection wavelength of 600nm, so that the handwriting color of the handwriting board is red, the nematic liquid crystal proportion of which delta n is 0.3 is 80%, the addition proportion of the chiral agent S811 is 11%, and the addition proportion of the chiral agent S2011 is 9%.
The first cholesteric liquid crystal enables a handwriting film to display blue cholesteric liquid crystal when acting alone, the second cholesteric liquid crystal enables the handwriting film to display green cholesteric liquid crystal when acting alone, and the third cholesteric liquid crystal enables the handwriting film to display red cholesteric liquid crystal when acting alone. When the three cholesteric liquid crystals are mixed at the same position of the handwriting film and then act together, the color effect of the three mixed colors can be displayed. When the mass percentages of the three cholesteric liquid crystals are changed continuously, the color displayed by the handwriting film is changed continuously. The change modes of the three cholesteric liquid crystal mass percentages can be any two changes, the other one is kept unchanged, and the other three can be changed simultaneously. It will be appreciated that in other embodiments the types of cholesteric liquid crystals can be extended to any number, for example n, n being a natural number and n.gtoreq.2, where the mass percentage of any m cholesteric liquid crystals varies with position, m being a natural number and 2.gtoreq.m.gtoreq.n.
Example 4
This embodiment explains a handwriting pad that can realize different color changing modes.
As an example, the mass percentages of the various cholesteric liquid crystals in this embodiment may vary in any direction of the handwriting film, as well as in some predetermined direction on the handwriting film. Thus, the color of the handwriting film can be changed into rich colors along the preset direction.
The direction of change can be any linear direction or any curved direction. The direction of the curve can be changed along a broken line formed by straight lines in different directions, or along a direction formed by combining the straight lines and the curved lines in different directions.
Wherein the mass percentages of the various cholesteric liquid crystals can be varied in one predetermined direction or simultaneously in a plurality of different directions. The specific change mode can be set according to the actual situation, and the handwriting films with different color changes can be correspondingly formed by the change modes of different mass percentages of the cholesteric liquid crystals, so that the color changes of the handwriting films are richer.
In addition, the mass percentages of the various cholesteric liquid crystals in the embodiment can also be randomly changed along with the positions, so that the colors appearing at the positions of the handwriting film are random, and the colors seen by a user after touching the handwriting film with a hand or other tools are randomly changed, thereby realizing the effect of disordered colors. Compared with the mode that only one color is fixedly displayed in one area in the prior art, the handwriting film of the embodiment has richer color change, and the interestingness of the handwriting board is remarkably improved.
In this embodiment, moreover, it is also possible to use various forms of random variation, for example, the mass percentages of the various cholesteric liquid crystals vary randomly in one direction or simultaneously in a plurality of directions, or the directions of variation are also random. For example, in the multi-cholesteric liquid crystal, the types of cholesteric liquid crystals with the mass percentage changing with the position are random, or the number of the types of cholesteric liquid crystals with the mass percentage changing with the position is random. This allows a color display on the writing pad that varies randomly in various ways.
In addition, the change in the mass percentages of the various cholesteric liquid crystals with position in this example can be either hopping or continuous.
The mass percentages of various cholesterol-phase liquid crystals adopt a continuous change mode to enable the handwriting board to display continuously changed colors, so that the displayed colors are most abundant. Wherein the mass percentages of the various cholesteric liquid crystals can be changed continuously in the above-mentioned directions. A random continuous variation may also be used. For example, the rate of change of the continuous change in the mass percent of various cholesteric liquid crystals changes randomly with the handwriting film. This allows the tablet to display the richest colors and also allows different colors to appear on the tablet in a randomly varying manner. The interest of the tablet is further increased.
Example 5
This embodiment provides an electronic writing device comprising a control circuit for applying voltage signals to the first electrode layer 1 and the second electrode layer 2 to switch the liquid crystal layer 3 between the FC state and the P state, and the writing film described in embodiments 1 to 4, which color freely changes with position.
The electronic writing device of this embodiment is manufactured by using the handwriting film in the foregoing embodiment, when the cholesteric liquid crystal is in the FC state, the liquid crystal handwriting board is only to display the color of the black substrate layer from the appearance, the position of the handwriting film subjected to the pressure action is converted from the FC state to the P state, and the handwriting film at the position reflects light of a certain waveband, so that a user can see lines or traces of a corresponding color. When the control circuit applies a voltage exceeding a certain threshold value to the first electrode layer and the second electrode layer, an electric field originally in a P-state cholesteric liquid crystal formed between the first electrode layer and the second electrode layer is converted into an FC state, and color traces on the handwriting film are removed.
Example 6
As shown in fig. 5, the present embodiment provides a liquid crystal writing film manufacturing apparatus, which includes a pressing device 10, including a first pressing roller 11 and a second pressing roller 12, whose axial directions of rotation are parallel to each other, a pressing gap 13 for passing a first material layer 21, a second material layer 22 and a liquid crystal filling material is formed between the first pressing roller 11 and the second pressing roller 12, and the pressing device 10 is configured to press the first material layer 21, the second material layer 22 and the liquid crystal filling material together to form a liquid crystal writing film when they pass through the gap;
in the process of manufacturing the liquid crystal writing film, the related conveying mechanism conveys the first material layer 21 and the second material layer 22 toward the nip 13 of the laminating device 10. Wherein the first material layer 21 and the second material layer 22 may be a PET film or a PC film combined with a transparent electrode film. Meanwhile, the driving mechanism drives the first pressing roller 11 and the second pressing roller 12 to rotate oppositely, wherein the rotating shaft directions of the first pressing roller 11 and the second pressing roller 12 are both perpendicular to the conveying direction of the first material layer 21 and the second material layer 22 when the first material layer and the second material layer are conveyed to the pressing gap 13. The liquid crystal material pouring device pours the liquid crystal material between the first material layer 21 and the second material layer 22 while the first material layer 21 and the second material layer 22 are moved toward the nip gap 13. When the first material layer 21, the second material layer 22 and the liquid crystal material pass through the pressing gap 13 between the first pressing roller 11 and the second pressing roller 12, the first material layer 21, the second material layer 22 and the liquid crystal material between the two are tightly attached together through the rolling action of the two pressing rollers, and the liquid crystal handwriting film with stable structure is formed.
The liquid crystal material filling device 30 includes a liquid crystal material conveying unit, a liquid crystal material mixing unit and a liquid crystal material filling port 33, the liquid crystal material conveying unit is communicated with the liquid crystal material mixing unit, the liquid crystal material mixing unit is communicated with the liquid crystal material filling port 33, the liquid crystal material conveying unit is configured to convey at least two liquid crystal materials of different colors to the liquid crystal material mixing unit, the liquid crystal material mixing unit is configured to mix the at least two liquid crystal materials of different colors together, and the liquid crystal material filling port 33 is configured to fill the liquid crystal material mixed by the liquid crystal material mixing unit between the first material layer 21 and the second material layer 22.
The liquid crystal filling device in the present embodiment includes a liquid crystal material mixing unit added between the liquid crystal material feeding unit and the liquid crystal material filling opening 33. The types of liquid crystal materials to be mixed may be determined before the liquid crystal material is poured, for example, liquid crystal materials capable of displaying red and liquid crystal materials capable of displaying blue may be mixed, and then the liquid crystal materials capable of displaying red and the liquid crystal materials capable of displaying blue may be fed into the liquid crystal material mixing unit by the liquid crystal material feeding unit. In the liquid crystal material mixing unit, a liquid crystal material that can display red and a liquid crystal material that can display blue are mixed together. Finally, the liquid crystal material pouring port 33 pours the mixed liquid crystal material between the first material layer 21 and the second material layer 22. The handwriting film manufactured by the equipment can display various colors between the two colors because the two liquid crystal materials are coated at the same position, the proportion of the two liquid crystal materials at different positions is different, and the displayed colors are different. If the mixing degree of the liquid crystal materials with the two colors is not controlled deliberately, the mixing proportion of the two materials at each position of the handwriting film is random, so the colors displayed by the manufactured handwriting film are also random, namely, the liquid crystal handwriting film manufactured by the equipment can display the effect of disordered colors. Although the foregoing examples only illustrate the mixing of liquid crystal materials of two colors, red and blue, it is understood that the present embodiment may also adopt any other liquid crystal materials of any color, and the number of mixed colors may be any number, and the types and the number of mixed colors are not limited herein.
As shown in fig. 6 and 7, in the present embodiment, the liquid crystal material conveying unit includes a plurality of conveying flow channels 31, each conveying flow channel 31 is configured to correspondingly convey a liquid crystal material of one color to the liquid crystal material mixing unit, wherein the colors of the liquid crystal materials conveyed by at least two conveying flow channels 31 are different.
In order to be able to convey a plurality of liquid crystal materials of different colors, the liquid crystal material conveying unit of the present embodiment is in a form of a combination of a plurality of conveying flow channels 31, each conveying flow channel 31 only fixedly conveys the liquid crystal material of one color, and the liquid crystal material of the same color may be conveyed by one conveying flow channel 31 or by a plurality of conveying flow channels 31.
For example, the liquid crystal material transporting unit includes four transporting flow paths of a first transporting flow path, a second transporting flow path, a third transporting flow path and a fourth transporting flow path. The liquid crystal material conveying unit needs to convey liquid crystal materials of four colors, wherein the first conveying flow channel conveys the liquid crystal material of a first color, the second conveying flow channel conveys the liquid crystal material of a second color, the third conveying flow channel conveys the liquid crystal material of a third color, and the fourth conveying flow channel conveys the liquid crystal material of a fourth color.
For another example, the liquid crystal material transporting unit includes four transporting flow paths 31, a first transporting flow path, a second transporting flow path, a third transporting flow path, and a fourth transporting flow path. The liquid crystal material conveying unit needs to convey liquid crystal materials of three colors, wherein the first conveying flow channel conveys the liquid crystal material of a first color, the second conveying flow channel conveys the liquid crystal material of the first color, the third conveying flow channel conveys the liquid crystal material of a second color, and the fourth conveying flow channel conveys the liquid crystal material of a third color.
For another example, the liquid crystal material transfer unit includes four transfer flow paths, a first transfer flow path, a second transfer flow path, a third transfer flow path, and a fourth transfer flow path. The liquid crystal material conveying unit needs to convey liquid crystal materials of two colors, wherein the first conveying flow channel conveys the liquid crystal material of a first color, the second conveying flow channel conveys the liquid crystal material of the first color, the third conveying flow channel conveys the liquid crystal material of a second color, and the fourth conveying flow channel conveys the liquid crystal material of the second color.
For another example, the liquid crystal material transfer unit includes four transfer flow paths, a first transfer flow path, a second transfer flow path, a third transfer flow path, and a fourth transfer flow path. The liquid crystal material conveying unit needs to convey liquid crystal materials of two colors, wherein the first conveying flow channel conveys the liquid crystal material of a first color, the second conveying flow channel conveys the liquid crystal material of the first color, the third conveying flow channel conveys the liquid crystal material of the first color, and the fourth conveying flow channel conveys the liquid crystal material of the second color.
Further, the liquid crystal material mixing unit of the present embodiment includes at least one mixing flow channel 32, and the mixing flow channel 32 is configured to communicate with the delivery flow channel 31 corresponding to the liquid crystal material to be mixed.
In this embodiment, the liquid crystal material mixing unit adopts the form of the mixing flow channel 32, so that liquid crystal materials of different colors can be quickly mixed in the flow channel process, the production efficiency of the handwriting film manufacturing equipment is obviously improved, the randomness of the mixing proportion of the liquid crystal materials of various colors on the handwriting film is also improved, and the effect of disordered color distribution of the liquid crystal handwriting film is further enhanced.
In other embodiments, the liquid crystal material mixing unit may also adopt other structures or components capable of mixing liquid crystal materials of different colors, for example, a structure or component having a containing cavity capable of containing liquid crystal materials of multiple colors communicated with a liquid crystal material conveying unit capable of conveying liquid crystal materials of multiple colors. Or a pipeline structure communicated with a liquid crystal material conveying unit capable of conveying a plurality of colors.
In the present embodiment, the mixing channel 32 is configured to communicate with the delivery channels 31 corresponding to the liquid crystal materials to be mixed, for example, one of the mixing channels 32 needs to mix the liquid crystal material of the first color, the liquid crystal material of the second color and the liquid crystal material of the third color, and then the mixing channel 32 communicates with the delivery channel 31 for delivering the liquid crystal material of the first color, the delivery channel for delivering the liquid crystal material of the second color and the delivery channel for delivering the liquid crystal material of the third color.
The way of communicating the mixing channel 32 with the conveying channel 31 corresponding to the liquid crystal material to be mixed may be to directly communicate the corresponding conveying channel 31 with the mixing channel 32 by using a pipeline or a pipe. For example, the liquid crystal material mixing unit has two mixing channels 32, a first mixing channel and a second mixing channel. The first mixing channel needs to mix the liquid crystal material of the first color and the liquid crystal material of the second color, and the second mixing channel needs to mix the liquid crystal material of the second color and the liquid crystal material of the third color. The first mixing flow channel is communicated with the conveying flow channel 31 for conveying the liquid crystal material with the first color and the conveying flow channel 31 for conveying the liquid crystal material with the second color through pipelines, and the second mixing flow channel is directly communicated with the conveying flow channel 31 for conveying the liquid crystal material with the second color and the conveying flow channel 31 for conveying the liquid crystal material with the third color through pipelines. The pipe connected to the mixing channel 32 can be a three-way pipe, a four-way pipe, or any other connecting pipe with any number of ports. Wherein, when the length of the mixing flow channel is between 0.1cm and 7cm, the handwriting film with rich colors can be obtained.
It is understood that the number of the liquid crystal mixing channels 32 of the conveying channels 31 and the distribution manner of the conveying channels 31 can be set according to the kind of liquid crystal material to be mixed, and the specific number is not limited herein.
In addition to the aforementioned way in which the mixing channel 32 communicates with the respective delivery channel 31, the present embodiment also provides other communication ways.
Specifically, the liquid crystal material mixing unit includes at least one mixing flow channel 32, the mixing flow channel 32 is connected to the plurality of conveying flow channels 31 through an on-off control device, and the on-off control device is used for controlling the connection and disconnection between the mixing flow channel 32 and the conveying flow channels 31. The on-off control device is configured to control the mixing flow channel 32 to communicate with the conveying flow channel 31 corresponding to the liquid crystal material to be mixed and to be closed off from the remaining conveying flow channels 31.
As shown in fig. 7, in the present embodiment, each delivery channel 31 is connected to each mixing channel 32 in advance through an on-off control device, wherein the on-off control device may be a pipe with an on-off valve 34.
For example, the liquid crystal material mixing unit has two mixing channels 32, a first mixing channel and a second mixing channel. The first mixing channel needs to mix the liquid crystal material of the first color and the liquid crystal material of the second color, and the second mixing channel 32 needs to mix the liquid crystal material of the second color and the liquid crystal material of the third color. The first mixing flow path 32 and the second mixing flow path 32 may be connected to the transport flow path 31 for transporting the liquid crystal material of the first color, the transport flow path 31 for transporting the liquid crystal material of the second color, and the transport flow path 31 for transporting the liquid crystal material of the third color, respectively, in advance using an on-off control device.
When the liquid crystal materials mixed in the first mixing flow channel 32 are poured, the valve 34 between the first mixing flow channel 32 and the conveying flow channel 31 for conveying the liquid crystal materials of the first color is opened, so that the first mixing flow channel 32 is communicated with the conveying flow channel 31 for conveying the liquid crystal materials of the first color, and simultaneously, the valve 34 between the first mixing flow channel 32 and the conveying flow channel 31 for conveying the liquid crystal materials of the second color is opened, so that the first mixing flow channel 32 is communicated with the conveying flow channel 31 for conveying the liquid crystal materials of the second color, and the valve 34 between the first mixing flow channel 32 and the conveying flow channel 31 for conveying the liquid crystal materials of the third color is closed, so that only the liquid crystal materials of the first color and the liquid crystal materials of the second color can enter the first mixing flow channel 32 through the corresponding conveying channels to be mixed.
When the liquid crystal materials mixed in the second mixing flow channel 32 are poured, the valve 34 between the second mixing flow channel 32 and the conveying flow channel 31 for conveying the liquid crystal materials of the second color is opened, so that the second mixing flow channel 32 is communicated with the conveying flow channel 31 for conveying the liquid crystal materials of the second color, meanwhile, the valve 34 between the second mixing flow channel 32 and the conveying flow channel 31 for conveying the liquid crystal materials of the third color is opened, so that the second mixing flow channel 32 is communicated with the conveying flow channel 31 for conveying the liquid crystal materials of the third color, and the valve 34 between the first mixing flow channel 32 and the conveying flow channel 31 for conveying the liquid crystal materials of the first color is closed, so that only the liquid crystal materials of the second color and the liquid crystal materials of the third color can enter the second mixing flow channel 32 through the corresponding conveying channels to be mixed.
By adopting the scheme, when the type of the liquid crystal material to be mixed in the mixing flow channel 32 is changed, the connection mode of the original pipeline is not required to be changed, and more flexible production can be realized.
The valves 34 controlling the on-off between the flow passages can be ordinary valves 34, and the operator can open or close the valves 34 according to the production process to control the on-off of the valves 34.
In addition, in order to improve the automation degree, the valve 34 for controlling the on-off of each flow channel may also adopt an electric control valve 34, and is configured with a corresponding controller, such as a PLC, an industrial personal computer, an embedded control system, and the like. The signal output end of the controller is connected with the control signal input end of each electric control valve 34, and the controller can generate control signals according to the process requirements to automatically control the on-off condition of each valve 34, so that the types of the liquid crystal materials entering each mixing flow channel 32 to be mixed are controlled.
In practice, each of the transport channels 31 may be connected to a source of liquid crystal material of a corresponding color. For example, different types of liquid crystal materials may be stored in different storage containers, and then each of the transport channels 31 may communicate with the corresponding storage container according to the color type of the liquid crystal material. In order to enable the liquid crystal material to be transferred into the mixing flow channel 32 through the transfer flow channel 31, a pump may be further provided to pump the liquid crystal material.
In this embodiment, a first driving device 35 is further included, and the driving device is configured to drive the liquid crystal material filling opening 33 to move, so that an outlet of the liquid crystal material filling opening 33 from which the corresponding liquid crystal material is dropped is located at a set filling position.
In this embodiment, a pouring head may be configured for each mixing channel 32 in the liquid crystal material mixing unit, and the liquid crystal material mixed by the mixing unit is poured between two layers of materials through the pouring head.
In other embodiments, a structure in which the liquid crystal material mixing unit and the liquid crystal material filling port 33 are integrated may be adopted, and the mixing channel 32 is used for mixing different types of liquid crystal materials and filling the mixed liquid crystal materials at the same time, in this way, one end of the mixing channel 32 is used for receiving different types of liquid crystal materials, and the other end forms the liquid crystal material filling port 33 for filling the mixed liquid crystal materials.
Whichever form of the liquid crystal material pouring port 33 is employed, the position at which the liquid crystal material is dripped from the liquid crystal material pouring device 30 is preferably a side from the first material layer 21 and the second material layer 22 of the two pressing rollers entering the nip 13.
As shown in fig. 8 and 9, in the present embodiment, the first driving device 35 is used to drive the liquid crystal material pouring opening 33 to move, so that the preset pouring opening for pouring the liquid crystal material after being mixed correspondingly is located at the correct pouring position. For example, the liquid crystal material filling device 30 is provided with a first filling opening, a second filling opening and a third filling opening, which are respectively used for filling the first mixed liquid crystal material, the second mixed liquid crystal material and the third mixed liquid crystal material. The current process requires to pour the second mixed liquid crystal material into the first material layer 21 and the second material layer 22, and then the first driving device 35 drives the second pouring opening to move to a position right above the pressing gap 13, and then the second mixed liquid crystal material flows out from the second pouring opening to a position between the first material layer 21 and the second material layer 22. The direction of the arrow in fig. 9 is the moving direction of the liquid crystal material pouring port 33.
Wherein liquid crystal material perfusion device 30 can set up one and pour into the mouth and also can set up a plurality of mouths of pouring into, when being provided with a plurality of mouths of pouring into, a plurality of mouths of pouring into can be arranged into a row along the direction parallel with pressfitting gap 13, and first drive arrangement 35 drives this row of mouth of pouring into and moves back and forth along the direction parallel with pressfitting gap 13 to make corresponding mouth of pouring into in a plurality of mouths of pouring into be located the position of pouring of settlement.
In this embodiment, a plurality of filling heads may be further provided, each filling head is communicated with one mixing flow channel 32, a filling opening is formed on the conveying filling head, the plurality of filling heads are arranged along the first direction, and the first driving device 35 is configured to drive the plurality of filling heads to move along the first direction, so that the corresponding filling heads move to the filling position. Wherein the first direction may be along a direction parallel to the nip 13.
The pouring opening can be moved along a straight line direction or can be rotated around a certain center. As shown in fig. 10, the plurality of infusion ports are arranged at different circumferential positions of the same circumference. The first driving device 35 drives the plurality of filling ports to rotate along the circumference, and moves the filling port corresponding to the mixed liquid crystal material to be filled to a preset filling position. The direction of the arrow in fig. 10 is the direction of rotation of the liquid crystal material pouring port 33.
The first driving device 35 can drive each pouring opening to move synchronously or drive each pouring opening to move independently.
The first material layer 21 and the second material layer 22 may enter the nip 13 in a vertical direction in the present application, and may also enter the nip 13 in a horizontal direction.
In this embodiment, the flow control device may be used to control the flow rate of the liquid crystal material of each color flowing into the liquid crystal material mixing unit, so as to control the ratio of each liquid crystal material in the mixed liquid crystal material, and finally control the color displayed by the liquid crystal handwriting film. The flow control means may be a valve 34 installed between each of the delivery flow paths 31 and the mixing flow path 32 to control the flow. The flow control device can also be used for controlling the flow rate of the liquid crystal materials of various colors flowing into the liquid crystal material mixing unit, thereby controlling the mixing degree of the liquid crystal materials of different colors to control the color of the handwriting film.
In addition, as shown in fig. 11, the present embodiment further includes an ultraviolet curing device 40, and the external light generated by the ultraviolet curing device 40 is used to irradiate the curing glue in the liquid crystal material during the pressing process, so that the liquid crystal glue is cured quickly, which is beneficial to quickly forming the liquid crystal handwriting film.
As shown in fig. 12, in order to enable the first material layer 21 and the second material layer to be well pressed, the present embodiment is further provided with a pressure control device, and the pressure applied to the first material layer 21 and the second material layer 22 by the first pressing roller 11 and the second pressing roller 12 during the pressing process is controlled by the pressure control device. The pressure control device comprises a controller, a pressure sensor and a pressing roller spacing adjusting mechanism, wherein the controller controls the pressing roller spacing adjusting mechanism to adjust the size of the pressing gap 13 according to the pressure applied to the liquid crystal handwriting film by the first pressing roller 11 and the second pressing roller 12 detected by the pressure sensor, and when the detected pressure is smaller than the preset pressure, the controller controls the spacing adjusting mechanism to drive the first pressing roller 11 and the second pressing roller 12 to approach each other, so that the pressing gap 13 is reduced, the total pressure of the pressing process is improved, and vice versa.
In addition, in order to continuously convey the first material layer 21 and the second material layer 22 to the pressing device 10, in this embodiment, a first material feeding device 50 is disposed on the material inlet side of the pressing roller for feeding the first material layer 21, a second material feeding device 60 is disposed for feeding the second material layer 22, and a winding mechanism 70 is disposed on the material outlet side of the pressing roller for winding the pressed liquid crystal writing film.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The handwriting film with the color freely changing along with the position is characterized by comprising a first electrode layer, a second electrode layer and a liquid crystal layer, wherein the first electrode layer and the second electrode layer are arranged oppositely, the liquid crystal layer is positioned between the first electrode layer and the second electrode layer, and the liquid crystal layer comprises a cholesteric liquid crystal and an adhesive;
in at least one part of the area of the handwriting film, at least two different types of cholesteric liquid crystals are mixed at the same position in the liquid crystal layer, the mass percentages of at least two types of cholesteric liquid crystals are changed along with the position of the handwriting film, and the central reflection wavelengths of the different cholesteric liquid crystals are different.
2. A handwriting film with color changing freely with position according to claim 1, characterized in that said cholesteric liquid crystal comprises: a first cholesteric liquid crystal with the central reflection wavelength range of 420-480 nm and a second cholesteric liquid crystal with the central reflection wavelength of 600 nm.
3. The handwriting film with freely changing colors along with positions as claimed in claim 2, wherein said first cholesteric liquid crystal comprises nematic liquid crystal with Δ n being 0.3, first chiral agent S811 and second chiral agent S5011, and the mass percentages of said nematic liquid crystal, first chiral agent S811 and second chiral agent S5011 are 80% -92%, 17% -19.9% and 0.1% -3%, respectively.
4. A handwriting film according to claim 2, characterized in that said second cholesteric liquid crystal comprises a nematic liquid crystal with Δ n ═ 0.3, a first chiral agent S811 and a third chiral agent S2011, said nematic liquid crystal, first chiral agent S811 and third chiral agent S2011 being 80%, 11% and 9% respectively by mass.
5. A handwriting film having a color that varies freely with position according to claim 1, characterized in that said cholesteric liquid crystal comprises a first cholesteric liquid crystal and a second cholesteric liquid crystal, said first cholesteric liquid crystal having a central reflection wavelength λ1The central reflection wavelength lambda of the second cholesteric liquid-crystal phase2Let d be | λ1-λ2|，d≥80nm。
6. The handwriting film with color changing freely with position according to claim 1, characterized in that the mass percentage of the various types of cholesteric liquid crystals changes randomly with the position of the handwriting film.
7. A handwriting film according to claim 6, characterized in that the mass percentages of at least two cholesteric liquid crystals vary randomly in the first direction of the handwriting film.
8. A handwriting film according to claim 6, characterised in that the mass percentages of at least two cholesteric liquid crystals are randomly changing simultaneously in at least two directions of the handwriting film.
9. The handwriting film of any of claims 1 to 8, wherein said handwriting film is free to change color with position: still including the relative transparent substrate layer and the ground colour substrate layer that set up, transparent basic level is in the one side that first electrode layer deviates from the liquid crystal layer, ground colour substrate layer is located the one side that the second electrode layer deviates from the liquid crystal layer.
10. An electronic writing device comprising a control circuit for applying a voltage signal to the first electrode layer and the second electrode layer to switch the liquid crystal layer between the FC state and the P state, and the position-freely color-variable handwriting film according to any one of claims 1 to 9.
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| CN202011526898.8A CN112596288B (en) | 2020-03-04 | 2020-03-04 | Liquid crystal handwriting film and electronic writing device |
| CN202010143586.2A CN111367106B (en) | 2020-03-04 | 2020-03-04 | Handwriting film with color freely changing along with position and electronic writing equipment |
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| CN202010143586.2A CN111367106B (en) | 2020-03-04 | 2020-03-04 | Handwriting film with color freely changing along with position and electronic writing equipment |
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| CN202011526898.8A Division CN112596288B (en) | 2020-03-04 | 2020-03-04 | Liquid crystal handwriting film and electronic writing device |
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| CN101921596B (en) * | 2009-06-16 | 2013-03-20 | 财团法人工业技术研究院 | Reflection type liquid crystal material composition and reflection type bistable state liquid crystal display |
| CN108089385B (en) * | 2017-12-26 | 2020-05-19 | 佛山市南海区瑞联胶粘制品有限公司 | Liquid crystal handwriting device capable of being locally wiped |
| CN108761947A (en) * | 2018-08-08 | 2018-11-06 | 吴飞 | Cholesteric liquid crystal handwriting board device with display function and preparation method thereof |
| CN110824752A (en) * | 2019-11-21 | 2020-02-21 | 徐州市保立创新材料科技有限公司 | Liquid crystal handwriting board capable of displaying multiple colors |
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| US20080266278A1 (en) * | 2007-04-27 | 2008-10-30 | Industrial Technology Research Institute | Color cholesteric liquid crystal display devices and driving methods thereof |
| CN206725911U (en) * | 2017-04-05 | 2017-12-08 | 深圳市唯酷光电有限公司 | Color liquid crystal writing device |
| CN106980216A (en) * | 2017-04-20 | 2017-07-25 | 深圳市屏柔科技有限公司 | A kind of hand-written LCDs and preparation method thereof |
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| CN112596288B (en) | 2023-05-09 |
| CN111367106B (en) | 2021-01-29 |
| CN112596288A (en) | 2021-04-02 |
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