CN113759623A - Liquid crystal writing board, display method thereof and writing device - Google Patents
Liquid crystal writing board, display method thereof and writing device Download PDFInfo
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- CN113759623A CN113759623A CN202111044882.8A CN202111044882A CN113759623A CN 113759623 A CN113759623 A CN 113759623A CN 202111044882 A CN202111044882 A CN 202111044882A CN 113759623 A CN113759623 A CN 113759623A
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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
- G02F1/139—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 orientation effects in which the liquid crystal remains transparent
- G02F1/1391—Bistable or multi-stable liquid crystal cells
Abstract
The application provides a liquid crystal writing board, a display method and a writing device thereof, wherein a bistable liquid crystal layer in the liquid crystal writing board comprises a plurality of pixel units, each pixel unit comprises a first liquid crystal subunit, a second liquid crystal subunit and a third liquid crystal subunit which are arranged side by side along the direction parallel to a first transparent substrate, and any two adjacent liquid crystal subunits are isolated by a transparent spacer; the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are configured to respectively reflect red light, green light and blue light under the action of a first preset electric field and are configured to be in a scattering state under the action of a second preset electric field. The bistable liquid crystal layer displays white under the action of the first preset electric field, and each liquid crystal subunit is converted into a scattering state under the action of the second preset electric field to display the color of the shading substrate, so that black or color handwriting can be written under a white background, and the handwriting definition of the writing board is greatly improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a liquid crystal writing board, a display method and a writing device thereof.
Background
Education clipboard has traditional blackboard and white plastic slab and electron to write by hand the blackboard three kinds on the market at present, and traditional blackboard is black ground glass, need use white chalk to write, and long-term accumulated chalk dust leads to the fact the influence to health like amazing upper respiratory tract mucosa etc. to human body, and the pigment pen need be bought to white plastic slab, often meets the pigment pen and does not have the ink condition to traditional blackboard and blank time length all can meet and clean not clean problem.
Therefore, with the development of liquid crystal display technology, liquid crystal writing boards are increasingly used in the fields of education, business application, and the like. However, the comprehensive display brightness and contrast of the common writing board in the market are low at present, so that the writing definition is low, and the user experience is greatly improved.
Disclosure of Invention
In order to solve the problems, the application provides a liquid crystal writing board, a display method and a writing device thereof, and the technical problem that the handwriting definition of the electronic writing board is low in the prior art can be solved.
In a first aspect, the present application provides a liquid crystal writing pad comprising: the liquid crystal display panel comprises a first transparent substrate, a shading substrate and a bistable liquid crystal layer, wherein the first transparent substrate and the shading substrate are oppositely arranged, and the bistable liquid crystal layer is positioned between the first transparent substrate and the shading substrate;
a first transparent electrode plate is arranged on one side of the first transparent substrate close to the bistable liquid crystal layer;
a second transparent electrode plate is arranged on one side, close to the bistable liquid crystal layer, of the shading substrate;
the bistable liquid crystal layer comprises a plurality of pixel units, each pixel unit comprises a first liquid crystal sub-unit, a second liquid crystal sub-unit and a third liquid crystal sub-unit which are arranged side by side along the direction parallel to the first transparent substrate, and any two adjacent liquid crystal sub-units are isolated by a transparent spacer;
the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are configured to respectively reflect red light, green light and blue light under the action of a first preset electric field and are configured to be in a scattering state under the action of a second preset electric field.
In some embodiments, in the above liquid crystal writing board, the second preset electric field is greater than the first preset electric field;
when the bistable liquid crystal layer is positioned under the first preset electric field and one side of the first transparent substrate, which is far away from the bistable liquid crystal layer, is pressed, the electric field of the bistable liquid crystal layer at the pressing position is changed into the second preset electric field from the first preset electric field.
In some embodiments, the liquid crystal writing board further includes a touch component.
In some embodiments, in the above liquid crystal writing board, the first transparent electrode plate includes a plurality of first sub-electrodes arranged in an array;
the second transparent electrode plate comprises a plurality of second sub-electrodes arranged in an array.
In some embodiments, in the above liquid crystal writing board, the color of the light-shielding substrate is configured to be the color of handwriting.
In some embodiments, in the above liquid crystal writing panel, the color of the light-shielding substrate is selected from any color other than white.
In some embodiments, in the above liquid crystal writing board, the materials of the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit all include cholesteric liquid crystal.
In some embodiments, in the liquid crystal writing board, liquid crystal molecules in the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit are in a planar texture state under the first preset electric field, and are in a focal conic texture state under the second preset electric field.
In some embodiments, in the above liquid crystal writing board, the light shielding substrate includes a second transparent substrate, and a light shielding layer disposed between the second transparent substrate and the second transparent electrode plate.
In some embodiments, in the above liquid crystal writing board, the light shielding layer is provided with a plurality of protrusions on a side close to the second transparent electrode plate.
In some embodiments, the liquid crystal writing board further includes:
a driving unit electrically connected to the first and second transparent electrode plates, the driving unit configured to apply a voltage between the first and second transparent electrode plates to apply a corresponding electric field to the bistable liquid crystal layer.
In a second aspect, the present application provides a display method of the liquid crystal writing board according to any one of the first aspect, including:
applying a first voltage between the first transparent electrode plate and the second transparent electrode plate to apply the first preset electric field to the bistable liquid crystal layer, so that the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit respectively reflect red light, green light and blue light under the action of the first preset electric field, and the bistable liquid crystal layer displays white under the action of the first preset electric field;
in response to a writing operation acting on one side of the first transparent substrate far away from the bistable liquid crystal layer, an electric field of the bistable liquid crystal layer at a writing position is converted into the second preset electric field from the first preset electric field, so that the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit at the writing position are converted into a scattering state under the action of the second preset electric field, and the color of the shading substrate is displayed on the bistable liquid crystal layer at the writing position.
In some embodiments, the display method of the liquid crystal writing board further includes:
applying a third voltage between the first transparent electrode plate and the second transparent electrode plate in response to the received erasing instruction to apply a third preset electric field to the bistable liquid crystal layer, so that liquid crystal molecules in all the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are converted into a vertical texture state under the action of the third preset electric field; wherein the third preset electric field is larger than the second preset electric field;
and returning to the step of applying the first voltage between the first transparent electrode plate and the second transparent electrode plate, so that liquid crystal molecules in all the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are converted into a planar texture state from the vertical texture state under the action of the first preset electric field, and the bistable liquid crystal layer restores to display white.
In some embodiments, the display method of the liquid crystal writing board further includes:
applying a third voltage between the first sub-electrode of the first transparent electrode plate and the second sub-electrode of the second transparent electrode plate at the writing position in response to the received erasing instruction to apply a third preset electric field to the bistable liquid crystal layer at the writing position, so that liquid crystal molecules in the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit at the writing position are converted into a vertical texture state under the action of the third preset electric field; wherein the third preset electric field is larger than the second preset electric field;
returning to the step of applying the first voltage between the first transparent electrode plate and the second transparent electrode plate, so that liquid crystal molecules in the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit at the writing position are converted into a planar texture state from the vertical texture state under the action of the first preset electric field, and the bistable liquid crystal layer restores to display white.
In a third aspect, the present application provides a writing instrument comprising a liquid crystal writing board and a writing pen as defined in any one of the first aspects.
By adopting the technical scheme, the following technical effects can be at least achieved:
the application provides a liquid crystal writing board, a display method thereof and a writing device, wherein the liquid crystal writing board comprises a first transparent substrate and a shading substrate which are oppositely arranged, and a bistable liquid crystal layer positioned between the first transparent substrate and the shading substrate; the bistable liquid crystal layer comprises a plurality of pixel units, each pixel unit comprises a first liquid crystal sub-unit, a second liquid crystal sub-unit and a third liquid crystal sub-unit which are arranged side by side along the direction parallel to the first transparent substrate, and any two adjacent liquid crystal sub-units are isolated by a transparent spacer; the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are configured to respectively reflect red light, green light and blue light under the action of a first preset electric field and are configured to be in a scattering state under the action of a second preset electric field. Through set up in every pixel element at bistable liquid crystal layer can reflect red light, three kinds of liquid crystal subunit of green glow and blue light respectively under the effect of first predetermined electric field, make bistable liquid crystal layer shows white under the effect of first predetermined electric field, and each liquid crystal subunit becomes the scattering state under the effect of second predetermined electric field, demonstrates the colour of shading base plate, can realize writing black or colored handwriting under white background, shows that luminance and contrast all improve greatly, has improved the handwriting definition of clipboard greatly, has promoted user experience and has felt.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not to limit the application. In the drawings:
FIG. 1 is a schematic cross-sectional view of a liquid crystal writing tablet according to an exemplary embodiment of the present application;
FIG. 2 is a schematic diagram of a pixel arrangement of a liquid crystal writing board according to an exemplary embodiment of the present application;
fig. 3(a) is a schematic diagram illustrating an arrangement of cholesteric liquid crystal molecules in a planar texture state according to an exemplary embodiment of the present application;
fig. 3(b) is a schematic diagram illustrating an arrangement of cholesteric liquid crystal molecules in a focal conic texture state according to an exemplary embodiment of the present application;
fig. 3(c) is a schematic diagram illustrating an arrangement of cholesteric liquid crystal molecules in a homeotropic texture state according to an exemplary embodiment of the present application;
FIG. 4 is a diagram illustrating the relationship between the reflectivity and the voltage of a liquid crystal cell in an initial state according to an exemplary embodiment of the present application;
FIG. 5 is a schematic cross-sectional view of a liquid crystal writing board in a writing state according to an exemplary embodiment of the present application;
FIG. 6 is a diagram illustrating the relationship between the reflectivity and the voltage of a liquid crystal cell in a writing state according to an exemplary embodiment of the present application;
FIG. 7 is a diagram illustrating reflectivity versus voltage for an erased state of a liquid crystal cell according to an exemplary embodiment of the present application;
in the drawings, wherein like parts are designated with like reference numerals, the drawings are not necessarily to scale;
the reference signs are:
11-a first transparent substrate; 12-a light-shielding substrate; 121-a second transparent substrate; 122-a light-shielding layer; 13-a bistable liquid crystal layer; 131-a first liquid crystal subunit; 132-a second liquid crystal subunit; 133-a third liquid crystal subcell; 134-a transparent spacer; 14-a first transparent electrode plate; 15-a second transparent electrode plate; 16-a drive unit.
Detailed Description
The following detailed description will be provided with reference to the accompanying drawings and embodiments, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and various features in the embodiments of the present application can be combined with each other without conflict, and the formed technical solutions are all within the scope of protection of the present application. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present application, detailed structures and steps will be provided in the following description in order to explain the technical solutions proposed in the present application. The following detailed description of the preferred embodiments of the present application, however, will suggest that the present application may have other embodiments in addition to these detailed descriptions.
The application provides a liquid crystal writing board, as shown in fig. 1, comprising a first transparent substrate 11 and a light-shielding substrate 12 which are oppositely arranged, and a bistable liquid crystal layer 13 positioned between the first transparent substrate 11 and the light-shielding substrate 12.
The first transparent substrate 11 is provided with a first transparent electrode plate 14 on a side close to the bistable liquid crystal layer 13.
The light-shielding substrate 12 is provided with a second transparent electrode plate 15 on a side close to the bistable liquid crystal layer 13.
The bistable liquid crystal layer 13 includes a plurality of pixel units (not labeled), as shown in fig. 2, each pixel unit includes a first liquid crystal sub-unit 131, a second liquid crystal sub-unit 132 and a third liquid crystal sub-unit 133 arranged side by side along a direction parallel to the first transparent substrate 11, and any two adjacent liquid crystal sub-units are separated by a transparent spacer 134.
The transparent spacer 134 is disposed between two adjacent liquid crystal sub-units in the same pixel unit, and also disposed between two adjacent pixel units, and the transparent spacer 134 plays a role in blocking light.
In some embodiments, the orthographic projection of the first, second and third liquid crystal sub-cells 131, 132 and 133 on the light-shielding substrate 12 has a width W of at least 100 μm and a length L of at least 40 μm.
In some embodiments, the width W of the pixel unit is at least 100 μm and the length L is at least 120 μm.
The first, second and third liquid crystal sub-units 131, 132 and 133 are configured to reflect red light, green light and blue light, respectively, under the action of a first preset electric field, and are configured to be in a scattering state under the action of a second preset electric field.
Under the action of the first preset electric field, the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 respectively reflect red light, green light and blue light, and the pixel unit displays white.
Under the action of the second preset electric field, the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132 and the third liquid crystal sub-unit 133 are in a scattering state, and the pixel unit displays the color of the light shielding substrate 12.
In some embodiments, in the initial state of the liquid crystal writing board, the whole bistable liquid crystal layer 13 is under the action of the first preset electric field, and the whole bistable liquid crystal layer 13 displays white, and the liquid crystal writing board is a writing whiteboard.
The magnitude of the second preset electric field and the first preset electric field depends on the voltage and distance between the first transparent electrode plate 14 and the second transparent electrode plate 15.
In some embodiments, the second preset electric field is larger than the first preset electric field, when the bistable liquid crystal layer 13 is under the first preset electric field and a side (writing side) of the first transparent substrate 11 away from the bistable liquid crystal layer 13 is pressed (including writing pressing by a writing pen or a finger of a user), at a pressed position, a distance between the first transparent electrode plate 14 and the second transparent electrode plate 15 is reduced, an electric field of the bistable liquid crystal layer 13 at the pressed position is increased, and can be converted into the second preset electric field from the first preset electric field, and the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 of the bistable liquid crystal layer 13 at the pressed position are converted into a scattering state from a state of reflecting red light, green light and blue light, so that the color of the shading substrate 12 is displayed, and a character is displayed on the white liquid crystal writing board.
In some embodiments, the liquid crystal tablet 11 includes a touch-sensitive component.
For example, the touch component may be an infrared touch component (not shown). The infrared touch component may be disposed around the first transparent substrate for positioning a touch or writing position of a user on the liquid crystal writing board 11.
In some embodiments, the touch-sensing component may be disposed on a side (writing side) of the first transparent substrate 11 away from the bistable liquid crystal layer 13; the touch control component can be a capacitive touch control component or a resistive touch control component.
Further, in some embodiments, the first transparent electrode plate 14 includes a plurality of first sub-electrodes (not shown) arranged in an array, and the second transparent electrode plate 15 includes a plurality of second sub-electrodes (not shown) arranged in an array.
Further, in some embodiments, the first sub-electrodes and the second sub-electrodes correspond one to one.
Correspondingly, when the touch device recognizes that the writing side of the first transparent substrate 11 is touched (e.g., a writing touch operation by a user), the driving unit 16 may be controlled to apply a predetermined voltage between the first sub-electrode and the second sub-electrode at the touch position, so that the bistable liquid crystal layer 13 generates a second predetermined electric field at the touch position, and the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132, and the third liquid crystal sub-unit 133 at the touch position are changed from a state of reflecting red light, green light, and blue light to a scattering state, thereby displaying the color of the light-shielding substrate 12, and displaying the handwriting on the white liquid crystal writing board.
With the writing board structure, a user can realize writing operation and handwriting display on the writing board through touch control, and writing sensitivity can be improved.
It should be noted that, in the writing board structure provided with the touch control assembly, when the first liquid crystal subunit 131, the second liquid crystal subunit 132, and the third liquid crystal subunit 133 can maintain the state of respectively reflecting red light, green light, and blue light under the action of the 0 electric field, the magnitude of the first preset electric field may be 0, that is, in the initial state of displaying white, the magnitude of the voltage applied between the first transparent electrode plate 14 and the second transparent electrode plate 15 may be 0V.
In some embodiments, the color of the light-shielding substrate 12 is configured to be the color of the writing script.
In some embodiments, the color of the light-shielding substrate 12 is selected from any color other than white, and may be black or colored, and may be set according to actual requirements.
According to the scheme for displaying the handwriting on the white liquid crystal writing board, the display brightness and the contrast of the writing board are greatly improved, the handwriting definition of the writing board is greatly improved, and the user experience is improved.
In some embodiments, the materials of the first, second and third liquid crystal sub-cells 131, 132 and 133 include cholesteric liquid crystals having bistable properties, or nematic liquid crystals that have been treated by a special alignment method to achieve bistable state.
In some embodiments, the materials of the first, second, and third liquid crystal sub-units 131, 132, and 133 each include cholesteric liquid crystals.
Cholesteric liquid crystals have a unique helical arrangement in which the liquid crystal molecules are twisted in layers, the molecules lying in layers parallel to each other, in each of which the molecules tend to align parallel to each other like a nematic phase, but the director of the molecules rotates substantially uniformly and continuously in the direction normal to the layer plane, the layer spacing at which the director rotates 360 being referred to as the pitch P0. Cholesteric liquid crystals include Planar Texture states (P-states), Focal Conic Texture states (FC-states), and Homeotropic Texture states (H-states). Wherein the plane texture state (P state) and the focal conic texture state (FC state) can be stably maintained without voltage maintenance. As shown in fig. 3(a), when cholesteric liquid crystal exhibits a planar texture state (P state), liquid crystal molecules are spatially spirally aligned around a spiral axis perpendicular to a substrate surface, and when light is incident on the liquid crystal surface, the liquid crystal molecules selectively reflect light of a specific wavelength λ. As shown in fig. 3(b), when the cholesteric liquid crystal is in a focal conic texture state (FC state), the liquid crystal molecules are still spirally aligned, but the directions of the spiral axes of the liquid crystal domains are randomly distributed, the molecules are in a multi-domain state, and incident light is scattered at the boundary between adjacent liquid crystal domains due to a sudden change in refractive index, so that the color of the lower substrate can be transmitted. A potential barrier with a certain height exists between the plane texture state (P state) and the focal conic texture state (FC state), the potential barrier can be overcome by an external electric field, so as to realize the conversion between the plane texture state (P state) and the focal conic texture state (FC state), if the cholesteric liquid crystal is initially in the plane texture state (P state), after the electric field is increased to a threshold electric field (such as a second preset electric field), the conversion from the plane texture state (P state) to the focal conic texture state (FC state) occurs, the focal conic texture state (FC state) is a steady state, even if the electric field or voltage is reduced to zero, the focal conic texture state (FC state) is always maintained, the external electric field is further increased to a saturated electric field (such as a third preset electric field, applied in an erasing mode), the focal conic texture state (FC state) is converted to a vertical structure state (H state) as shown in fig. 3(c), because the vertical structure state (H state) is not a steady state, if the voltage is rapidly reduced to a certain threshold or zero, the liquid crystal is converted to an initial plane texture state (P state), a focal conic texture state (FC state) can be converted to a vertical structure state (H state) and then to a plane texture state (P state), for example, the high-voltage pulse can be used for realizing the liquid crystal.
Correspondingly, in this embodiment, the liquid crystal molecules in the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132 and the third liquid crystal sub-unit 133 are in a planar texture state (P state) under the first predetermined electric field and in a focal conic texture state (FC state) under the second predetermined electric field.
The first liquid crystal subunit 131, the second liquid crystal subunit 132, and the third liquid crystal subunit 133 are induced by polymer to form different liquid crystal domains, the liquid crystal helical axis directions in the domains are different, the effective refractive indexes are different, and in a planar texture state (P state), light with a specific wavelength λ can be selectively reflected, so that blue light, green light, and red light are respectively reflected.
Correspondingly, the transparent shielding object can be a polymer network, can induce the cholesteric liquid crystal to form different liquid crystal domains, and reflects light with different spectrums.
Correspondingly, the bistable liquid crystal layer 13 may be prepared by forming the transparent spacers 134 on the substrate and then forming the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132, and the third liquid crystal sub-unit 133 at corresponding positions through a fine process such as dropping, thereby forming the bistable liquid crystal layer 13.
Correspondingly, when the liquid crystal writing board is in the initial state, the whole bistable liquid crystal layer 13 is in the first preset electric field, liquid crystal molecules in the first liquid crystal subunit 131, the second liquid crystal subunit 132, and the third liquid crystal subunit 133 are in the plane texture state (P state) in the first preset electric field, and respectively reflect blue light, green light, and red light, and the whole bistable liquid crystal layer 13 displays white, at this time, the liquid crystal writing board is a writing whiteboard.
When the bistable liquid crystal layer 13 is under a first preset electric field and one side (writing side) of the first transparent substrate 11 away from the bistable liquid crystal layer 13 is pressed (including writing pressing by a writing pen or a finger of a user), at a pressing position, the distance between the first transparent electrode plate 14 and the second transparent electrode plate 15 is reduced, the electric field of the bistable liquid crystal layer 13 at the pressing position is increased and can be converted into a second preset electric field from the first preset electric field, liquid crystal molecules in the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 at the pressing position are converted into a focal conic texture state (FC state) from a plane texture state (P state), scattering occurs, and the bistable liquid crystal layer 13 displays the color of the shading substrate 12 at the pressing position, so that the handwriting is displayed on the white liquid crystal writing board.
And the focal conic texture state (FC state) is a stable state, even if the pressing force applied at the pressing position is reduced or disappeared, the electric field applied to the bistable liquid crystal layer 13 is restored to the initial state (first preset electric field), and the handwriting on the liquid crystal writing board will not disappear.
Correspondingly, in the writing board structure provided with the touch control assembly, when the liquid crystal molecules of the first liquid crystal subunit 131, the second liquid crystal subunit 132, and the third liquid crystal subunit 133 can maintain the planar texture state (P state) under the action of the 0 electric field, the magnitude of the first preset electric field may be 0, that is, the magnitude of the voltage applied between the first transparent electrode plate 14 and the second transparent electrode plate 15 in the initial state of displaying white color may be 0V.
In some embodiments, the light shielding substrate 12 includes a second transparent substrate 121, and a light shielding layer 122 disposed between the second transparent substrate 121 and the second transparent electrode plate 15.
In some embodiments, the material of the light shielding layer 122 may be a black matrix layer or a color resist layer.
In some embodiments, the material of the second transparent substrate 121 may be the same as the material of the first transparent substrate 11, and may be glass or a transparent PET protective film.
In some embodiments, the material of the second transparent substrate 121 may be different from the material of the first transparent substrate 11, and preferably, in order to improve the writing sensitivity of the writing board, the first transparent substrate 11 may use polyethylene terephthalate with a larger elastic modulus, and the second transparent substrate 121 may use glass.
In some embodiments, the light shielding layer 122 is provided with a plurality of protrusions on a side close to the second transparent electrode plate 15, so that when liquid crystal molecules of the bistable liquid crystal layer 13 are in a focal conic texture state (FC state), light passes through the bistable liquid crystal layer 13 and the second transparent electrode plate 15, and diffuse reflection occurs on a side of the light shielding layer 122 close to the second transparent electrode plate 15, so that the color of the light shielding substrate 12 displayed by the bistable liquid crystal layer 13 is more obvious, and writing handwriting is more obvious.
In some embodiments, the liquid crystal writing board further comprises: a driving unit 16 electrically connected to the first transparent electrode plate 14 and the second transparent electrode plate 15, the driving unit 16 being configured to apply a voltage between the first transparent electrode plate 14 and the second transparent electrode plate 15 to apply a corresponding electric field to the bistable liquid crystal layer 13.
In some embodiments, the driving unit 16 is configured to apply a corresponding voltage between the first transparent electrode plate 14 and the second transparent electrode plate 15 according to a user's turn-on or erase instruction to apply a corresponding electric field to the bistable liquid crystal layer 13.
In some embodiments, in response to the writing board structure provided with the touch component, the driving unit 16 may be configured to apply corresponding voltages between all the first sub-electrodes and the second sub-electrodes according to an erasing instruction of a user, so that the bistable liquid crystal layer 13 is entirely restored to the initial state (white board state), and the writing is erased. Alternatively, the driving unit 16 may be configured to apply a corresponding voltage between the first sub-electrode and the second sub-electrode, which have a voltage state different from the initial state, according to an erasing instruction of a user, so that only the liquid crystal molecules at the position where the written note is located are restored to the initial state, and the written note may be erased as well.
Alternatively, when the touch device recognizes that the erasing operation is performed on the writing side of the first transparent substrate 11, the driving unit 16 may be controlled to apply a predetermined voltage to the first sub-electrode and the second sub-electrode at the touch position, so that the bistable liquid crystal layer 13 generates a third predetermined electric field at the touch position, and the third predetermined electric field is larger than a potential barrier for the cholesteric liquid crystal molecules to be transformed into the vertical texture state (H state), so that the liquid crystal molecules in the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132, and the third liquid crystal sub-unit 133 at the touch position are transformed into an unstable vertical texture state (H state) by the third predetermined electric field. Finally, when the initial voltage (i.e., the voltage for maintaining the planar texture state of the liquid crystal molecules) is restored between the first sub-electrode and the second sub-electrode, the cholesteric liquid crystal molecules in the bistable liquid crystal layer 13 are directly restored from the unstable vertical texture state (H state) to the stable planar texture state (P state), so that the bistable liquid crystal layer 13 restores to display white, and the initial state is restored, thereby implementing local erasure.
It is understood that when all the liquid crystal molecules in the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132 and the third liquid crystal sub-unit 133 are subjected to the third preset electric field at the same time or at a similar time, the overall erasing of the liquid crystal writing board 11 can be realized.
Through set up in every pixel cell at bistable liquid crystal layer 13 in this application can reflect ruddiness respectively under first predetermined electric field effect, the three kinds of liquid crystal subunit of green glow and blue light, make bistable liquid crystal layer 13 show white under first predetermined electric field effect, and each liquid crystal subunit changes the scattering state under the effect of second predetermined electric field, show shading base plate 12's colour, can realize writing black or colored handwriting under white background, show that luminance and contrast all improve greatly, the handwriting definition of clipboard has been improved greatly, user experience sense has been promoted.
The application also provides a display method of the liquid crystal writing board, which comprises the following steps:
step S110: a first voltage is applied between the first transparent electrode plate 14 and the second transparent electrode plate 15 to apply a first preset electric field to the bistable liquid crystal layer 13, so that the first liquid crystal subunit 131, the second liquid crystal subunit 132, and the third liquid crystal subunit 133 respectively reflect red light, green light, and blue light under the action of the first preset electric field, thereby enabling the bistable liquid crystal layer 13 to display white under the action of the first preset electric field.
In some embodiments, when the materials of the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132 and the third liquid crystal sub-unit 133 are made of cholesteric liquid crystal, as shown in fig. 4, in the initial state, towards one of the first transparent electrode plate 14 and the second transparent electrode plate 15Applying a first voltage V betweenaAt this time, the writing board is not pressed, and the equivalent voltage of each position of the bistable liquid crystal layer 13 is VaAnd V isaIs kept constant and the first voltage VaLess than or equal to the maximum voltage V of the bistable liquid crystal layer 13 in the planar texture state (P state)wA first preset electric field is applied to the bistable liquid crystal layer 13, so that the liquid crystal molecules in the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 are in a planar texture state (P state) under the action of the first preset electric field, and respectively reflect red light, green light and blue light, so that the bistable liquid crystal layer 13 displays white under the action of the first preset electric field.
Due to the first voltage Va≤VwEven if V isw0V results in a first voltage VaAt 0V, since each liquid crystal subunit is already in the plane texture state (P state), during the voltage application period and after the voltage is removed and stabilized, each liquid crystal subunit is always in the plane texture state (P state), the reflectivity is not changed, at this time, the reflectivity is Rp, the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 respectively reflect red light, green light and blue light, and the whole can reflect the whole visible light to present white.
The application of the first voltage is effected by the drive unit 16.
Step S120: in response to a writing operation applied to a side of the first transparent substrate 11 away from the bistable liquid crystal layer 13, an electric field of the bistable liquid crystal layer 13 at the writing position is converted from a first preset electric field to a second preset electric field, so that the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132 and the third liquid crystal sub-unit 133 at the writing position are converted into a scattering state under the action of the second preset electric field, and the bistable liquid crystal layer 13 displays a color of the shading substrate 12 at the writing position.
In some embodiments, the second preset electric field is larger than the first preset electric field, as shown in fig. 5, the electric field variation at the writing position may be a decrease in the distance between the first transparent electrode plate 14 and the second transparent electrode plate 15 due to the writing pressure, when the distance between the first transparent electrode plate 14 and the second transparent electrode plate 15 is reduced to a value where the electric field between the two is larger than the potential barrier for the cholesteric liquid crystal molecules to change from the planar texture state (P state) to the focal conic texture state (FC state), i.e. the second predetermined electric field, the liquid crystal molecules in the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 at the writing position are changed from the planar texture state (P state) to the focal conic texture state (FC state) under the action of the second predetermined electric field, so that the bistable liquid crystal layer 13 shows the color of the light-shielding substrate 12 at the writing position.
As shown in FIG. 6, in the writing state, the voltage applied between the first transparent electrode plate 14 and the second transparent electrode plate 15 is still the first voltage Va＝VwThe equivalent voltage of the bistable liquid crystal layer 13 (liquid crystal cell) at the non-written position is still Va＝VwThe liquid crystal molecules at the non-writing position are still in a plane texture state (P state), the display color of the writing board is that the whole visible light is reflected, the writing board is white, and the display principle is the same as that of the initial state; when writing, the distance between the electrode plates at the pressed position is reduced due to pressing, so that the electric field intensity between the electrode plates is increased, and it is assumed that the equivalent voltage in the bistable liquid crystal layer 13 at the pressed position is VfAt this time, VfAt VK(minimum voltage for cholesteric liquid crystal to reach FC state) and Vg(maximum voltage at which cholesteric liquid crystal reaches FC state) interval, V is different according to pressing force degree of writingfIn a different way, VKAnd VgThe specific value of (A) is determined according to the properties of different bistable liquid crystal materials, when V isK≤Vf≤VgWhen the liquid crystal molecules are changed from the P state to the FC state, the reflectivity is reduced from Rp to Rfc, the liquid crystal sub-unit scatters, and the display color at the pressed position is the color of the light shielding substrate 12 and can be black or color. Even if the pressing disappears when writing is stopped, the voltage of the bistable liquid crystal layer 13 (liquid crystal cell) returns to the original state at both the written position and the unwritten position, i.e., the voltage at each position is Va＝VwThe electric field strength at the previous pressed position returns to the original value, but the written liquid crystal molecules maintain stable FC state as long as the voltage does not break through VgThis portion of the liquid crystal molecules always remains in the FC state. Thus, a color distinction is achieved between a written position and an unwritten position, where black or color writing is displayed on the whiteboard.
Besides, for the writing board structure provided with the touch component, in response to the writing operation applied to the side of the first transparent substrate 11 away from the bistable liquid crystal layer 13, a second voltage may be applied between the first sub-electrode and the second sub-electrode at the writing position through the driving unit 16, so that the electric field of the bistable liquid crystal layer 13 at the writing position is converted from the first preset electric field to the second preset electric field, and the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132, and the third liquid crystal sub-unit 133 at the writing position are converted into the scattering state under the action of the second preset electric field, so that the color of the shading substrate 12 is displayed by the bistable liquid crystal layer 13 at the writing position.
Step S130: in response to the received erase command, applying a third voltage between the first transparent electrode plate 14 and the second transparent electrode plate 15 to apply a third preset electric field to the bistable liquid crystal layer 13, so that all liquid crystal molecules in the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 are converted into a vertical texture state under the action of the third preset electric field; and the third preset electric field is larger than the second preset electric field.
The third preset electric field is larger than the potential barrier of the cholesteric liquid crystal molecules converted into the vertical texture state (H state), when the driving unit 16 applies a third preset electric field to the bistable liquid crystal layer 13, the cholesteric liquid crystal molecules at the writing position (position with writing) are transformed from the focal conic texture state (FC state) to the vertical texture state (H state), the cholesteric liquid crystal molecules at the non-writing position (position without writing) are transformed from the planar texture state (P state) to the focal conic texture state (FC state) and then to the vertical texture state (H state), however, the cholesteric liquid crystal molecules are directly converted into the vertical texture state (H state) from the focal conic texture state (FC state) or are converted into the vertical texture state (H state) from the planar texture state (P state) firstly, the conversion time is very short, and the two modes can be approximately considered to be completed simultaneously.
As shown in FIG. 7, when the liquid crystal writing board is in the erasing state, a third voltage V is applied between the first transparent electrode plate 14 and the second transparent electrode plate 15b，VbA barrier voltage V equal to the transition of cholesteric liquid crystal molecules into the H statepIn which V isw＜Vg＜Vp，VpThe specific value is determined according to the properties of different bistable liquid crystal materials, in the erasing state, the first transparent substrate 11 is not pressed, the distance between the first transparent electrode plate 14 and the second transparent electrode plate 15 is the original state, and the equivalent voltage of the bistable liquid crystal layer 13 (liquid crystal box) is equal to VpAt this time, the liquid crystal in the bistable liquid crystal layer 13 at the written and pressed position is changed from FC state to H state, and the liquid crystal molecules in the bistable liquid crystal layer 13 at the non-written and pressed position are changed from P state to FC state and then to H state.
Step S140: the step of applying the first voltage between the first transparent electrode plate 14 and the second transparent electrode plate 15 (i.e., step S110) is returned, so that all the liquid crystal molecules in the first liquid crystal sub-unit 131, the second liquid crystal sub-unit 132 and the third liquid crystal sub-unit 133 are changed from the vertical texture state to the planar texture state under the action of the first preset electric field, and the bistable liquid crystal layer 13 resumes displaying white.
Since the homeotropic texture state (H state) is unstable, the driving unit 16 resumes applying the first voltage after applying the third voltage, so that the cholesteric liquid crystal molecules in the bistable liquid crystal layer 13 are directly restored from the unstable homeotropic texture state (H state) to the stable planar texture state (P state), thereby restoring the bistable liquid crystal layer 13 to display white and restoring the initial state.
That is, since the H state is not a stable state, the application of the pulse voltage will quickly change the bistable liquid crystal at the written and pressed position from the FC state to the P state, and the reflectivity will be restored to Rp, at this time, the electronic whiteboard will be in the initial state, and the whole electronic whiteboard can reflect the whole visible light to be white, thereby implementing the erasing function. During the erasing process, the equivalent voltage change process of the bistable liquid crystal layer 13 (liquid crystal box) is firstly from VwTo VfTo VpFinally recover Vw。
In some embodiments, for the writing board structure provided with the touch component, the erasing method described above may be adopted, and the following erasing methods may also be adopted, including:
step S132: in response to the received erase instruction, applying a third voltage between the first sub-electrode of the first transparent electrode plate 14 and the second sub-electrode of the second transparent electrode plate 15 at the writing position to apply a third preset electric field to the bistable liquid crystal layer 13 at the writing position, so that the liquid crystal molecules in the first liquid crystal sub-cell 131, the second liquid crystal sub-cell 132 and the third liquid crystal sub-cell 133 at the writing position are converted into a vertical texture state (H state) by the third preset electric field; the third preset electric field is larger than the second preset electric field;
step S142: the step of applying the first voltage between the first transparent electrode plate 14 and the second transparent electrode plate 15 (i.e., step S110) is returned, so that the liquid crystal molecules in the first liquid crystal subunit 131, the second liquid crystal subunit 132 and the third liquid crystal subunit 133 at the writing position are changed from the vertical texture state (H state) to the planar texture state (P state) under the action of the first preset electric field, thereby enabling the bistable liquid crystal layer 13 to display white again.
That is, for the writing board structure provided with the touch component, besides erasing the handwriting by adopting the whole-surface initialization method, the writing board structure can also be initialized only for the writing position to erase the handwriting.
The embodiment of the application also provides a writing device which comprises the liquid crystal writing board and the writing pen.
In some embodiments, the size of the pen point of the writing pen is 1mm to 3mm, which is much larger than the size of the pixel unit.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. Although the embodiments disclosed in the present application are described above, the embodiments are merely used for the understanding of the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (15)
1. A liquid crystal writing board, comprising: the liquid crystal display panel comprises a first transparent substrate, a shading substrate and a bistable liquid crystal layer, wherein the first transparent substrate and the shading substrate are oppositely arranged, and the bistable liquid crystal layer is positioned between the first transparent substrate and the shading substrate;
a first transparent electrode plate is arranged on one side of the first transparent substrate close to the bistable liquid crystal layer;
a second transparent electrode plate is arranged on one side, close to the bistable liquid crystal layer, of the shading substrate;
the bistable liquid crystal layer comprises a plurality of pixel units, each pixel unit comprises a first liquid crystal sub-unit, a second liquid crystal sub-unit and a third liquid crystal sub-unit which are arranged side by side along the direction parallel to the first transparent substrate, and any two adjacent liquid crystal sub-units are isolated by a transparent spacer;
the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are configured to respectively reflect red light, green light and blue light under the action of a first preset electric field and are configured to be in a scattering state under the action of a second preset electric field.
2. The liquid crystal writing board of claim 1, wherein the second preset electric field is greater than the first preset electric field;
when the bistable liquid crystal layer is positioned under the first preset electric field and one side of the first transparent substrate, which is far away from the bistable liquid crystal layer, is pressed, the electric field of the bistable liquid crystal layer at the pressing position is changed into the second preset electric field from the first preset electric field.
3. The liquid crystal writing board of claim 1, further comprising a touch component.
4. The liquid crystal writing board of claim 3, wherein the first transparent electrode plate comprises a plurality of first sub-electrodes arranged in an array;
the second transparent electrode plate comprises a plurality of second sub-electrodes arranged in an array.
5. The liquid crystal writing board according to claim 1, wherein the color of the light shielding substrate is configured to be the color of handwriting.
6. The liquid crystal writing board of claim 5, wherein the color of the light-shielding substrate is selected from any color other than white.
7. The liquid crystal writing board of claim 1, wherein the materials of the first, second and third liquid crystal subunits comprise cholesteric liquid crystals.
8. The liquid crystal writing board of claim 7, wherein the liquid crystal molecules in the first, second and third liquid crystal sub-units are in a planar texture state under the first preset electric field and in a focal conic texture state under the second preset electric field.
9. The liquid crystal writing board of claim 1, wherein the light-shielding substrate comprises a second transparent substrate, and a light-shielding layer disposed between the second transparent substrate and the second transparent electrode plate.
10. The liquid crystal writing board of claim 9, wherein the light shielding layer is provided with a plurality of protrusions on a side thereof adjacent to the second transparent electrode plate.
11. The liquid crystal writing board of claim 1, further comprising:
a driving unit electrically connected to the first and second transparent electrode plates, the driving unit configured to apply a voltage between the first and second transparent electrode plates to apply a corresponding electric field to the bistable liquid crystal layer.
12. A display method of a liquid crystal writing board according to any one of claims 1 to 11, comprising:
applying a first voltage between the first transparent electrode plate and the second transparent electrode plate to apply the first preset electric field to the bistable liquid crystal layer, so that the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit respectively reflect red light, green light and blue light under the action of the first preset electric field, and the bistable liquid crystal layer displays white under the action of the first preset electric field;
in response to a writing operation acting on one side of the first transparent substrate far away from the bistable liquid crystal layer, an electric field of the bistable liquid crystal layer at a writing position is converted into the second preset electric field from the first preset electric field, so that the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit at the writing position are converted into a scattering state under the action of the second preset electric field, and the color of the shading substrate is displayed on the bistable liquid crystal layer at the writing position.
13. The display method of a liquid crystal writing board according to claim 12, further comprising:
applying a third voltage between the first transparent electrode plate and the second transparent electrode plate in response to the received erasing instruction to apply a third preset electric field to the bistable liquid crystal layer, so that liquid crystal molecules in all the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are converted into a vertical texture state under the action of the third preset electric field; wherein the third preset electric field is larger than the second preset electric field;
and returning to the step of applying the first voltage between the first transparent electrode plate and the second transparent electrode plate, so that liquid crystal molecules in all the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit are converted into a planar texture state from the vertical texture state under the action of the first preset electric field, and the bistable liquid crystal layer restores to display white.
14. The display method of a liquid crystal writing board according to claim 12, further comprising:
applying a third voltage between the first sub-electrode of the first transparent electrode plate and the second sub-electrode of the second transparent electrode plate at the writing position in response to the received erasing instruction to apply a third preset electric field to the bistable liquid crystal layer at the writing position, so that liquid crystal molecules in the first liquid crystal sub-unit, the second liquid crystal sub-unit and the third liquid crystal sub-unit at the writing position are converted into a vertical texture state under the action of the third preset electric field; wherein the third preset electric field is larger than the second preset electric field;
returning to the step of applying the first voltage between the first transparent electrode plate and the second transparent electrode plate, so that liquid crystal molecules in the first liquid crystal subunit, the second liquid crystal subunit and the third liquid crystal subunit at the writing position are converted into a planar texture state from the vertical texture state under the action of the first preset electric field, and the bistable liquid crystal layer restores to display white.
15. A writing instrument comprising the liquid crystal writing board and the writing pen according to any one of claims 1 to 11.
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| CN115268146A (en) * | 2022-07-06 | 2022-11-01 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device based on high-temperature-resistant hard substrate |
| CN117092866A (en) * | 2023-06-14 | 2023-11-21 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device |
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