CN112987366B - Electronic handwriting board and application method thereof and terminal equipment - Google Patents
Electronic handwriting board and application method thereof and terminal equipment Download PDFInfo
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- CN112987366B CN112987366B CN202110153892.9A CN202110153892A CN112987366B CN 112987366 B CN112987366 B CN 112987366B CN 202110153892 A CN202110153892 A CN 202110153892A CN 112987366 B CN112987366 B CN 112987366B
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- G—PHYSICS
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- 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
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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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
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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Abstract
本申请涉及电子手写板及其应用方法和终端设备，一种电子手写板，其包括：可形变底板；压电薄膜层，设置在所述可形变底板层上；双稳态液晶层，设置在所述压电薄膜层上；透明基板，设置在所述双稳态液晶层上。上述电子手写板，一方面采用了双稳态液晶层实现电子手写功能；另一方面采用了压电薄膜层实现受压感应记忆书写位置，无需在供电状态下亦能记忆书写位置；再一方面采用了可形变底板以配合压电薄膜层实现了书写位置的定位擦除，从而在无需全部删除的基础上实现了局部清除；又一方面具有体积小、耗电低的优点。
The present application relates to an electronic tablet, an application method thereof, and a terminal device, an electronic tablet comprising: a deformable bottom plate; a piezoelectric film layer, disposed on the deformable bottom plate layer; and a bistable liquid crystal layer, disposed on the on the piezoelectric film layer; and a transparent substrate, which is arranged on the bistable liquid crystal layer. The above-mentioned electronic tablet, on the one hand, uses a bistable liquid crystal layer to realize the electronic handwriting function; on the other hand, uses a piezoelectric film layer to realize the pressure-sensitive memory writing position, which can also remember the writing position without power supply; A deformable bottom plate is used to cooperate with the piezoelectric film layer to realize the positioning and erasing of the writing position, thereby realizing partial erasing without all erasing. On the other hand, it has the advantages of small size and low power consumption.
Description
Technical Field
The application relates to the field of handwriting boards, in particular to an electronic handwriting board, an application method thereof and terminal equipment.
Background
In order to save paper and respond to environmental protection, electronic handwriting boards are released by various large companies, are light and thin, have high practicability and can effectively reduce the use amount of paper. The service life of an electronic handwriting board can reach about 50000 pieces of paper.
The electronic handwriting board deflects the liquid crystal by the pressure of pen touch to achieve the writing function, the electronic handwriting board generally does not have the storage and reading functions, and after the reset key is pressed down to be electrified, the liquid crystal returns to the original alignment, and the handwriting disappears. The electronic handwriting board is also called a liquid crystal handwriting board, an LCD handwriting board, a liquid crystal drawing board, an LCD doodle board and the like, is mainly used for children doodle, drawing exercise, writing and the like, can also be used for sketch, as a note or simple arithmetic, and is particularly more practical when drawing sketches, calculating and leaving boards, but the handwriting is thicker because no writing tip is provided and sharp carving is avoided.
Although the electronic handwriting board is convenient to use, the current traditional electronic handwriting board has the following problems: the power is supplied by a battery, the local cleaning is difficult, and only one key is used for deleting the whole data.
Disclosure of Invention
Based on this, there is a need for an electronic handwriting board, an application method thereof and a terminal device.
An electronic writing pad, comprising: a deformable bottom plate; the piezoelectric thin film layer is arranged on the deformable bottom plate layer; a bistable liquid crystal layer disposed on the piezoelectric thin film layer; and a transparent substrate disposed on the bistable liquid crystal layer.
On one hand, the electronic handwriting board adopts the bistable liquid crystal layer to realize the electronic handwriting function; on the other hand, the writing position is memorized by adopting the piezoelectric film layer in a pressed induction manner without being in a power supply state; on the other hand, the deformable bottom plate is adopted to match with the piezoelectric film layer to realize the positioning and erasing of the writing position, so that the local cleaning is realized on the basis of not needing to delete all the writing positions; the other aspect has the advantages of small volume and low power consumption.
In one embodiment, the piezoelectric thin film layer is a lead zirconate titanate film layer.
In one embodiment, the piezoelectric thin film layer comprises vinyl fluoride or a polymer thereof.
In one embodiment, the piezoelectric thin film layer comprises polyvinylidene fluoride or copolymers thereof.
In one embodiment, the piezoelectric film layer and the deformable substrate are stacked to form a unitary assembly.
In one embodiment, the electronic handwriting board further comprises an illuminating piece and a power supply circuit connected with the illuminating piece.
In one embodiment, the piezoelectric thin film layer is divided into a plurality of first partitions, the bistable liquid crystal layer is correspondingly divided into a plurality of second partitions, and the first partitions and the second partitions are arranged in a one-to-one correspondence manner; the electronic handwriting board further comprises a controller, the controller is respectively connected with each first subarea and each second subarea, and the controller is used for controlling the bistable liquid crystal layer to deflect corresponding to the second subareas when receiving a piezoelectric signal of the first subarea.
An application method of an electronic handwriting board comprises the following steps:
applying writing pressure to the bistable liquid crystal layer through the transparent substrate to deflect the bistable liquid crystal layer at the applied position;
and applying erasing pressure to the piezoelectric film layer at an erasing position of the deformable bottom plate corresponding to the pressing position so that the piezoelectric film layer is electrified and acts on the bistable liquid crystal layer to deflect the bistable liquid crystal layer at the erasing position.
An erasing method of an electronic handwriting board comprises the following steps:
applying erasing pressure to the piezoelectric film layer through the deformable bottom plate at the erasing position;
the piezoelectric film layer at the erasing position generates a piezoelectric effect and acts on the bistable liquid crystal layer;
the bistable liquid crystal layer at the erase position is deflected.
A terminal device comprising an electronic writing pad;
the electronic handwriting board comprises a deformable bottom plate; the piezoelectric thin film layer is arranged on the deformable bottom plate layer; a bistable liquid crystal layer disposed on the piezoelectric thin film layer; and a transparent substrate disposed on the bistable liquid crystal layer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electronic handwriting board according to an embodiment of the present application.
FIG. 2 is a schematic external view of an electronic handwriting board according to another embodiment of the present application.
Fig. 3 is a schematic external view of the embodiment of fig. 2 in another direction.
Fig. 4 is a schematic diagram of an electronic handwriting board according to another embodiment of the present application.
Fig. 5 is a diagram illustrating a writing state of the embodiment shown in fig. 4.
FIG. 6 is a diagram illustrating an erased state of the embodiment shown in FIG. 5.
FIG. 7 is a diagram illustrating a post-erase state of the embodiment shown in FIG. 6.
FIG. 8 is a schematic view of a piezoelectric film and an integrated circuit structure of an electronic handwriting board according to another embodiment of the present application.
FIG. 9 is a schematic view of a piezoelectric film and an integrated circuit structure of an electronic handwriting board according to another embodiment of the present application.
Fig. 10 is a schematic structural diagram of another embodiment of an electronic handwriting board of the present application.
Fig. 11 is a schematic diagram illustrating a writing principle of another embodiment of the electronic handwriting board of the present application.
FIG. 12 is a flowchart illustrating an embodiment of a method for applying an electronic handwriting pad according to the present application.
FIG. 13 is a flowchart illustrating an embodiment of a method for erasing an electronic handwriting pad according to the present application.
Reference numerals:
the liquid crystal display comprises a frame 100, a deformable bottom plate 200, a piezoelectric film layer 300, a bistable liquid crystal layer 400, a transparent substrate 500, a writing pen 600, an integrated circuit 700 and an illuminating piece 900;
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "on," "over," and "above" a second feature may be directly or obliquely below the second feature, or simply mean that the first feature is at a lesser elevation than the second feature.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment of the present application, as shown in fig. 1, an electronic handwriting board includes: a deformable bottom plate 200; a piezoelectric thin film layer 300 disposed on the deformable substrate layer 200; a bistable liquid crystal layer 400 disposed on the piezoelectric thin film layer 300; and a transparent substrate 500 disposed on the bistable liquid crystal layer 400. On one hand, the electronic handwriting board adopts the bistable liquid crystal layer to realize the electronic handwriting function; on the other hand, the piezoelectric film layer is adopted to realize the pressed induction memory of the writing position, and the writing position can be memorized without the power supply state; on the other hand, the deformable bottom plate is adopted to match with the piezoelectric film layer to realize the positioning and erasing of the writing position, so that the local clearing is realized on the basis of not needing to delete all the writing positions; the other aspect has the advantages of small volume and low power consumption.
In one embodiment, an electronic handwriting board comprises a part of or the whole structure of the following embodiments; that is, the electronic handwriting board includes some or all of the following technical features. In one embodiment, the deformable bottom plate, the piezoelectric film layer, the bistable liquid crystal layer and the transparent substrate are arranged in the same shape and size, and the design is favorable for integrally stacking the electronic handwriting board into a regular shape.
In order to protect the whole structure of the deformable bottom plate, the piezoelectric thin film layer, the bistable liquid crystal layer and the transparent substrate, in one embodiment, the electronic handwriting board further comprises a frame, the deformable bottom plate, the piezoelectric thin film layer, the bistable liquid crystal layer and the transparent substrate are stacked to form a whole structure, and the frame is arranged around the edge of the whole structure. Further, in one embodiment, the frame surrounds the edge of the integrated structure and exposes the deformable bottom plate and the transparent substrate. In one embodiment, the electronic handwriting board further comprises a frame, the deformable bottom plate, the piezoelectric film layer, the bistable liquid crystal layer and the transparent substrate are stacked to form an integral structure, and the frame is arranged around the edge of the integral structure. As shown in fig. 2, the electronic handwriting board further includes a frame 100, where the frame 100 is enclosed at an edge of the integrated structure and exposes the deformable bottom board 200; as shown in fig. 3, the frame 100 surrounds the edge of the integrated structure and exposes the transparent substrate 500. The design is beneficial to protecting the deformable bottom plate, the piezoelectric film layer, the bistable liquid crystal layer and the transparent substrate on one hand, and is beneficial to forming a complete product for sale on the other hand.
The deformable bottom plate is an important invention of the embodiments of the present application, and one of two main differences of the present application from the conventional electronic handwriting board is that the deformable bottom plate is used together with a piezoelectric film layer, and in one embodiment, the piezoelectric film layer and the deformable bottom plate are stacked to form an integral component. Further, in one embodiment, the deformable substrate comprises a base layer and a piezoelectric thin film layer, i.e. the piezoelectric thin film layer is integrated on the deformable substrate; in one embodiment, the electronic handwriting board comprises a deformable bottom board, a bistable liquid crystal layer and a transparent substrate which are arranged in a stacked mode, wherein the deformable bottom board comprises a base layer and a piezoelectric thin film layer, and the piezoelectric thin film layer is located between the base layer and the bistable liquid crystal layer; or, in one embodiment, the electronic handwriting board comprises a deformable bottom board, a bistable liquid crystal layer and a transparent substrate which are arranged in a stacked manner, wherein the deformable bottom board comprises a base layer and a piezoelectric film layer, and the piezoelectric film layer is clamped between the base layers. Further, in one embodiment, the deformable bottom plate is used for deforming when erasing handwriting, namely writing marks, so that the piezoelectric film layer is changed under the action of external pressure, and is used for applying voltage to the writing position of the bistable liquid crystal layer to deflect the liquid crystal so as to eliminate the writing marks; in one embodiment, the deformation of the deformable substrate is set according to a target pressure, and the deformation can be very slight, and only enough pressure can be applied to the piezoelectric film layer to generate a piezoelectric effect, so that the liquid crystal at the corresponding position is deflected. The design is beneficial to realizing the positioning and erasing of the writing position in a matching way, so that the local clearing is realized on the basis of not needing to delete all the writing positions; on the other hand, the utility model is beneficial to providing a product with certain flexibility, is convenient to carry and is not easy to damage.
In one embodiment, the deformable substrate layer is a transparent film layer, a semi-transparent film layer, a transparent soft board or a semi-transparent soft board. To facilitate recognition of the writing trace, in one embodiment, the deformable substrate layer is a translucent film layer or a translucent flexible sheet. Further, in one embodiment, the deformable floor layer has color particles to exhibit a predetermined color; in one embodiment, the deformable floor layer has dark regions and light regions; such a design is advantageous for presenting different ground colors. In one embodiment, the deformable substrate layer is a semitransparent white area, a black area or a colored area, which is beneficial to providing different writing experiences and realizing a certain drawing effect.
Embodiments of the present invention use this feature to advantage in that the piezoelectric film layer of embodiments of the present invention comprises lead zirconate titanate (PZT), or vinyl fluoride and polymers thereof, such as polyvinylidene fluoride (PVDF) or copolymers thereof. Further, in one embodiment, the piezoelectric film layer is disposed on the deformable bottom plate layer, and is configured to generate a piezoelectric effect at the erasing position when the deformable bottom plate is stressed, so that the piezoelectric film layer is energized and acts on the bistable liquid crystal layer, and the bistable liquid crystal layer is deflected at the erasing position; in one embodiment, the piezoelectric thin film layer is a transparent piezoelectric thin film layer. Namely, an electronic handwriting board, comprising: a deformable bottom plate; the transparent piezoelectric film layer is arranged on the deformable bottom plate layer; a bistable liquid crystal layer disposed on the piezoelectric thin film layer; and a transparent substrate disposed on the bistable liquid crystal layer. The rest of the embodiments are analogized and are not described in detail. The design that the piezoelectric film is matched with the bistable liquid crystal is an important invention point of each embodiment of the application, the erasing effect of the electronic handwriting board can be achieved without power supply to the bistable liquid crystal through the function of the piezoelectric film, and the piezoelectric film can be electrified by only using any hard object such as a nail or a plastic pen and the like to apply pressure to a deformable bottom plate such as a semitransparent soft plate in any area to be cleaned without charging or replacing a battery, so that liquid crystal molecules in the corresponding position are overturned, and handwriting is eliminated. The design of the semitransparent soft board is beneficial to the application of force to the erasing position of the erasing pressure to correspond to the track of the handwriting, namely the track of the point of applying pressure is consistent, so that the part to be erased can be eliminated.
In order to facilitate control of the pressure sensing memory of the writing position, the writing position can be memorized without being in a power supply state, in one embodiment, the piezoelectric film layer comprises two piezoelectric films which are overlapped, and the extension directions of the two piezoelectric films are perpendicular to each other. Further, in one embodiment, the electronic handwriting board or the piezoelectric film layer thereof has a rectangular shape, the center of the rectangle is taken as the center of a rectangular plane, the extending direction of one piezoelectric film layer is parallel to the X axis of the rectangular plane, and the extending direction of the other piezoelectric film layer is parallel to the Y axis of the rectangular plane. In one embodiment, the piezoelectric material is divided into two layers, one transverse X and one longitudinal Y, which register the X and Y positions, respectively, in a manner similar to a sensor. The line width, namely the spacing, of the piezoelectric material is at least less than the width of a pen touch, so that the phenomenon that the interruption is too obvious when handwriting is displayed is avoided; the typical commercially available nib is about 0.5 mm. The pressure signal is obtained by recording the position of the pen contact with any piezoelectric material such as PVDF, PZT, etc. and outputting voltage to the recording position during reading and reproducing to make the piezoelectric material generate stress, i.e. pressure, so that the liquid crystal at the position is deflected to achieve the effect of restoring the handwriting. The design is favorable for quickly positioning and marking the pressure applying position in a plane rectangular coordinate system mode, and is easy to accurately act on the bistable liquid crystal layer through aligning electricity when erasing pressure is applied to the piezoelectric film layer, so that crystalline substance molecules, namely liquid crystal molecules, of the bistable liquid crystal layer at the erasing position are deflected, the transparent state is recovered, and the positioning and erasing of the writing position are realized; the traditional electronic handwriting board mainly has no relation of a transparent piezoelectric film and most of the back board is a hard board, so that the effect of cleaning cannot be achieved.
Bistable liquid crystals have been widely used in conventional electronic writing pads, and further, in one embodiment, the bistable liquid crystal layer is disposed on the piezoelectric film layer and used for transmitting the colors of the piezoelectric film layer and the deformable bottom plate under a natural state, that is, under an unpowered state, that is, in a transparent state; under the state of being subjected to writing pressure, the crystalline substance molecules at the pressure applying position deflect to present a non-transparent state, namely, the writing content presented at the writing position can be understood as handwriting; in the state of being correspondingly controlled by the piezoelectric signal under the piezoelectric state of the piezoelectric film layer, the crystalline substance molecules at the erasing position are recovered from the deflection and are in a transparent state again, so that the erasing effect is realized. By adopting the design, on one hand, the bistable liquid crystal layer is adopted to realize the electronic handwriting function; on the other hand, the writing position is sensed and memorized under the pressure by matching with the piezoelectric film layer, the writing position can be memorized without being in a power supply state, and the writing position memory device further has the advantages of small volume and low power consumption.
In order to facilitate the control of the bistable liquid crystal layer by the piezoelectric film layer, in one embodiment, the electronic writing tablet further comprises an integrated circuit connected to the piezoelectric film layer. Further, in one embodiment, the integrated circuit is respectively connected with the two piezoelectric films, and in one embodiment, the integrated circuit is respectively connected with each thin-film material strip of the two piezoelectric films. Further, in one embodiment, each thin film material strip of the piezoelectric thin film layer is respectively connected with the integrated circuit, the integrated circuit forms a dot matrix and coordinates thereof according to the two layers of piezoelectric thin films, the erasing position is determined according to a piezoelectric signal of each coordinate, the erasing position corresponds to the clearing position of the bistable liquid crystal layer, and the clearing position of the bistable liquid crystal layer is subjected to an electric field action according to the piezoelectric signal of each coordinate, so that liquid crystal molecules of the bistable liquid crystal layer are deflected at the clearing position, namely the erasing position, and writing marks are eliminated.
In order to facilitate more complex electric control functions, in one embodiment, the electronic handwriting board further comprises a power supply circuit connected with the bistable liquid crystal layer. The power supply circuit has a power source such as a button cell battery or a polymer lithium battery. In one embodiment, the electronic handwriting board further comprises an integrated circuit connected with the piezoelectric film layer and a power supply circuit connected with the bistable liquid crystal layer. For embodiments of the present application, a power supply circuit is not necessary, but for embodiments with a power supply circuit, having a power supply circuit facilitates more functionality. Further, in one embodiment, the power supply circuit is also connected to the piezoelectric film layer. Further, in one embodiment, the piezoelectric film layer is connected with the bistable liquid crystal layer; in one embodiment, the piezoelectric thin film layer is connected with the bistable liquid crystal layer through the integrated circuit, and in one embodiment, the piezoelectric thin film layer is connected with the bistable liquid crystal layer through the integrated circuit and the power supply circuit. Further, in one embodiment, each thin film material strip of the piezoelectric thin film layer is connected with the bistable liquid crystal layer through the integrated circuit and the power supply circuit respectively. Further, in one embodiment, each thin film material strip of the piezoelectric thin film layer is respectively connected with the integrated circuit, the integrated circuit forms a dot matrix and coordinates thereof according to the two layers of piezoelectric thin films, and stores a piezoelectric signal of each coordinate, so as to determine an erasing position corresponding to the clearing position of the bistable liquid crystal layer, the integrated circuit is connected with the power supply circuit, and the power supply circuit performs power-on processing on the clearing position of the bistable liquid crystal layer, so that liquid crystal molecules of the bistable liquid crystal layer are deflected at the clearing position, namely the erasing position, and writing marks are eliminated. It can be understood that, for the electronic handwriting board described in the embodiments of the present application, only the electronic handwriting function and the positioning and erasing of the writing position need to be achieved in a matching manner, and a person skilled in the art can add or supplement some details according to the conventional electronic handwriting board.
The transparent substrate mainly protects the bistable liquid crystal layer, and in one embodiment, the transparent substrate is disposed on the bistable liquid crystal layer. In one embodiment, the transparent substrate is a transparent plastic substrate or a transparent insulating substrate. In one embodiment, the transparent substrate is a polymethyl methacrylate (PMMA) plate. It is understood that the thickness of the transparent substrate may be set according to requirements, and the embodiments of the present application do not impose additional limitations on this. The transparent substrate made of the insulating material avoids the phenomenon that when the piezoelectric material is applied with voltage, an electric field is formed to cause that the liquid crystal arrangement is not arranged according to the design, and the display and erasing effects are influenced.
The following continues to illustrate specific implementations of the present application.
In one embodiment, as shown in FIG. 4, the liquid crystal molecules in the bistable liquid crystal layer 400 are regularly aligned in the natural state, exemplified by the natural state direction 410, where the bistable liquid crystal layer 400 exhibits its own color, typically green. That is, in the natural state, the liquid crystal molecules are perpendicular to the plane, and the light penetrates through the liquid crystal layer to display the color of the liquid crystal layer.
During writing, writing includes writing or drawing, which is essentially to press the bistable liquid crystal layer 400 through the transparent substrate 500 at a writing position, so the writing position is also called a pressing position, as shown in fig. 5, writing is performed by using a writing pen 600 at a pressing position 510, at this time, liquid crystal molecules of the bistable liquid crystal layer 400 at the pressing position 510 are deflected, an alignment direction is exemplified as a deflection state direction 420, and the bistable liquid crystal layer 400 at the pressing position 510 no longer presents a transparent state, that is, the writing position presents writing contents; while the liquid crystal molecules of the bistable liquid crystal layer 400 at other positions continue to maintain the natural state direction 410, i.e., to assume a transparent state, thereby comparatively better presenting the written content at the writing position. That is, in the writing state, the liquid crystal molecules are parallel to the plane, and the light irradiates the turned liquid crystal to show the handwriting.
When the bistable liquid crystal layer 400 is pressed at a writing position through the transparent substrate 500, the pressure is applied to the piezoelectric film layer 300, the piezoelectric film layer 300 is pressed to generate a piezoelectric effect, the pressing position can be memorized, namely, the writing position is memorized by pressure induction, and if the power supply embodiment is adopted, the writing position can be memorized in a power-off state.
During erasing, as shown in fig. 6, for the pressing position 510, an erasing pressure is applied at the opposite corresponding position, namely the erasing position 210, namely, at the erasing position 210 of the deformable substrate 200 corresponding to the pressing position 510, an erasing pressure is applied to the piezoelectric film layer 300, so that the piezoelectric film layer 300 is electrified, namely, the piezoelectric film layer 300 is pressed to generate a piezoelectric effect, and then liquid crystal molecules at the pressing position 510 are correspondingly controlled to recover from deflection and to assume a transparent state again, as shown in fig. 7, it can be understood that the pressing position 510 shown in fig. 7 is for easy identification and comparison, and no trace of the pressing position 510 is actually left.
In the above embodiment, the deformable substrate 200 is a translucent flexible substrate, the piezoelectric film layer 300 is a transparent piezoelectric film, and the transparent substrate 500 is an insulating transparent plastic substrate. For example, the method of local erasing is to apply pressure on the translucent soft board in any area to be erased through any hard object such as nail, plastic pen, etc. to force the piezoelectric film to be electrified to force the liquid crystal to turn over, so as to erase the handwriting; because the piezoelectric film is used for electrifying, the electronic handwriting board does not need to be charged or the battery does not need to be replaced.
In order to facilitate the control of the bistable liquid crystal layer to realize erasing of the positioning area, in one embodiment, the piezoelectric thin film layer is divided into a plurality of first partitions, the bistable liquid crystal layer is correspondingly divided into a plurality of second partitions, and each first partition is arranged in one-to-one correspondence with each second partition; the electronic handwriting board further comprises a controller, the controller is respectively connected with the first subareas and the second subareas, and the controller is used for controlling the bistable liquid crystal layer to deflect corresponding to the second subareas when receiving a piezoelectric signal of one first subarea. The controller may be implemented using an integrated circuit. Further, in one embodiment, the electronic handwriting board further comprises a power supply circuit respectively connected to the controller and the bistable liquid crystal layer, and the controller is connected to the power supply circuit; further, in one embodiment, as shown in fig. 8, the piezoelectric film layer includes a plurality of thin film material strips 320 regularly arranged, each thin film material strip 320 is connected to a controller 700 through a separate line 710, a gap 310 exists between two adjacent thin film material strips 320, and further, in one embodiment, the thin film material strips 320 are used for transmitting an electrical signal to the controller 700 when a piezoelectric effect is generated, the controller 700 is used for receiving the electrical signal of the thin film material strips 320, determining a target erasing position, controlling a power supply circuit to apply a voltage to a position of the bistable liquid crystal layer corresponding to the thin film material strips 320 so as to deflect the liquid crystal, so as to eliminate writing or drawing marks of the position of the thin film material strips 320 corresponding to the bistable liquid crystal layer, or controlling the power supply circuit to apply a voltage to a predetermined area of the bistable liquid crystal layer at the target erasing position so as to deflect the liquid crystal, to eliminate writing or drawing traces in a predetermined area, i.e., a certain range. In one embodiment, the first partition is used as the predetermined area, and as shown in fig. 8, the strips 320 of film material are in the shape of vertically arranged strips as the first partition; alternatively, as shown in fig. 9, the strips 320 of film material are in the form of horizontally arranged strips as the first partitions; after writing or drawing on the bistable liquid crystal layer 400 through the transparent substrate 500, the target position of the piezoelectric film layer 300 is pressed through the deformable bottom plate 200, the film material strip 320 at the target position of the piezoelectric film layer 300 generates a piezoelectric effect and transmits an electric signal to the controller 700, and the controller 700 controls the application of voltage to the position of the bistable liquid crystal layer corresponding to the film material strip 320 so as to deflect the liquid crystal, thereby eliminating writing or drawing marks; alternatively, the controller 700 controls the application of voltage to the position of the bistable liquid crystal layer at the target position such that the liquid crystal is deflected, thereby eliminating writing or drawing traces; the design is beneficial to realizing the effect of regional erasing, improves the erasing efficiency and facilitates the use of users.
To facilitate use in a dark environment, in one embodiment, as shown in fig. 10, the tablet further includes an illuminating element 900, the illuminating element 900 is fixed in the frame 100, and the illuminating element 900 is connected to a power supply circuit for providing illuminating light. In one embodiment, the electronic handwriting board further comprises an illuminating piece and a power supply circuit connected with the illuminating piece, and the illuminating piece and the power supply circuit are fixed in the frame. Further, in one embodiment, the electronic handwriting board is provided with a brightness sensing switch and/or a manual switch connected with the illuminating element 900, the brightness sensing switch or the manual switch is fixed on the frame 100, and the brightness sensing switch is used for automatically turning on the illuminating element 900 in an enabled state and when the ambient brightness is lower than a threshold value; alternatively, the brightness sensing switch is used to automatically turn on the illumination member 900 in a state where the manual switch is turned on and when the ambient brightness is lower than the threshold value.
With respect to the gap 310 between two adjacent strips of film material 320, in one embodiment, as shown in fig. 11, the width of the tip 610 of the writing pen 600 is greater than the gap 310, i.e. the gap 310 between two adjacent strips of film material is less than the width of the tip 610 of the writing pen 600; theoretically, the smaller the gap between two adjacent thin film material strips is, the better the gap is, but considering the cost and the process realization, the writing trace without obvious interruption can be presented on the bistable liquid crystal layer only by the fact that the gap between the two adjacent thin film material strips is smaller than the width of the pen tip of the writing pen.
In one embodiment, as shown in fig. 12, a method for applying an electronic handwriting board includes the steps of: applying writing pressure to the bistable liquid crystal layer through the transparent substrate to deflect the bistable liquid crystal layer at the applied position; and applying erasing pressure to the piezoelectric film layer at an erasing position of the deformable bottom plate corresponding to the pressing position so that the piezoelectric film layer is electrified and acts on the bistable liquid crystal layer to enable the bistable liquid crystal layer to deflect at the erasing position. In one embodiment, after the erasing pressure is applied to the piezoelectric film layer, the piezoelectric film layer at the erasing position generates a piezoelectric effect to act on the bistable liquid crystal layer; the bistable liquid crystal layer at the erase position is deflected. In one embodiment, the application method is applied to the electronic handwriting board in any embodiment. Such a design is advantageous for the realization of a writable, partially erasable electronic writing pad.
Further, in one embodiment, the application method further includes the steps of: and supplying power to the bistable liquid crystal layer to restore the bistable liquid crystal layer as a whole. In one embodiment, the application method further comprises the steps of: and supplying power to the bistable liquid crystal layer according to the piezoelectric signal of the controller so as to restore the writing trace of the bistable liquid crystal layer. The design provides a function design of one-key clearing and/or one-key restoring. In one embodiment, the application method further includes the steps of: and supplying power to the bistable liquid crystal layer and a controller connected with the piezoelectric film layer so as to restore the bistable liquid crystal layer integrally and clear piezoelectric signals of the controller. The design provides a one-key reduction functional design.
In one embodiment, as shown in fig. 13, an electronic handwriting board erasing method includes the steps of: applying erasing pressure to the piezoelectric film layer through the deformable bottom plate at the erasing position; the piezoelectric film layer at the erasing position generates a piezoelectric effect and acts on the bistable liquid crystal layer; the bistable liquid crystal layer at the erase position is deflected. In one embodiment, the erasing method is used for the electronic handwriting board in any embodiment. Such a design is advantageous for cooperating with the implementation of a partially erasable electronic writing pad.
For applying the erasing pressure at the erasing position, the area of the applied pressure is about 0.5mm 2 To 10mm 2 (ii) a The pressure is about 0.05MPa to 0.5 MPa. Both area and pressure may be larger. In a specific application embodiment, the electronic handwriting board is written on an insulating transparent plastic substrate by a plastic pen in a writing mode, so that liquid crystal molecules of the bistable liquid crystal layer at a writing position, namely a pressure applying position are deflected and turned from a transparent vertical state to an opaque parallel state, thereby presenting handwriting; in the cleaning state, a nail, a scraper and other hard objects are used for pressing the deformable bottom plate at an erasing position corresponding to the pressing position, the hard objects apply erasing pressure to the piezoelectric film layer to enable the piezoelectric film layer to generate electric power, liquid crystal molecules of the bistable liquid crystal layer at the erasing position are deflected, and the bistable liquid crystal layer is turned from an opaque parallel state to a transparent vertical state, so that handwriting is eliminated.
In one embodiment, a terminal device comprises the electronic handwriting board of any embodiment; the electronic handwriting board comprises a deformable bottom plate, a piezoelectric film layer, a bistable liquid crystal layer and a transparent substrate which are arranged in a stacked mode. In one embodiment, a terminal device includes an electronic writing pad; the electronic handwriting board comprises a deformable bottom plate, a piezoelectric film layer, a bistable liquid crystal layer and a transparent substrate which are arranged in a stacked manner; the piezoelectric film layer is a transparent piezoelectric film layer, the piezoelectric film layer comprises two piezoelectric films which are overlapped, and the extension directions of the two piezoelectric films are mutually vertical. The rest of the embodiments are analogized and are not described in detail. In one embodiment, the terminal device comprises a children drawing board, an office white board, a drawing board, a display terminal, a mobile terminal and the like. By adopting the design, on one hand, the bistable liquid crystal layer is adopted to realize the electronic handwriting function; on the other hand, the writing position is memorized by adopting the piezoelectric film layer in a pressed induction manner without being in a power supply state; on the other hand, the deformable bottom plate is adopted to match with the piezoelectric film layer to realize the positioning and erasing of the writing position, so that the local clearing is realized on the basis of not needing to delete all the writing positions; the other aspect has the advantages of small volume and low power consumption.
Other embodiments of the present application further include an electronic handwriting board, an application method thereof, and a terminal device, where the electronic handwriting board is formed by combining technical features of the above embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (9)
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| US12229373B2 (en) | 2021-10-28 | 2025-02-18 | Beijing Boe Optoelectronics Technology Co., Ltd. | Liquid crystal handwriting panel, handwriting device, and method for controlling same |
| CN117234011A (en) * | 2023-09-21 | 2023-12-15 | 北京悦米科技有限公司 | Consumable-free maintenance-free liquid crystal handwriting board with self-generating function and use method thereof |
| CN117590633B (en) * | 2023-11-09 | 2024-07-12 | 深圳市弘扬德教科技有限公司 | Transparent liquid crystal film handwriting board for local erasing |
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Effective date of registration: 20240112 Address after: 518109, Building E4, 101, Foxconn Industrial Park, No. 2 East Ring 2nd Road, Fukang Community, Longhua Street, Longhua District, Shenzhen City, Guangdong Province (formerly Building 1, 1st Floor, G2 District), H3, H1, and H7 factories in K2 District, North Shenchao Optoelectronic Technology Park, Minqing Road, Guangdong Province Patentee after: INTERFACE OPTOELECTRONICS (SHENZHEN) Co.,Ltd. Patentee after: Interface Technology (Chengdu) Co., Ltd. Patentee after: GENERAL INTERFACE SOLUTION Ltd. Address before: No.689 Hezuo Road, West District, high tech Zone, Chengdu City, Sichuan Province Patentee before: Interface Technology (Chengdu) Co., Ltd. Patentee before: INTERFACE OPTOELECTRONICS (SHENZHEN) Co.,Ltd. Patentee before: Yicheng Photoelectric (Wuxi) Co.,Ltd. Patentee before: GENERAL INTERFACE SOLUTION Ltd. |
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