Weak-light self-powered electromagnetic handwriting device

Abstract

This invention discloses a low-light self-powered electromagnetic handwriting device, comprising a housing assembly, a transparent electromagnetic induction film, a photovoltaic power generation module, an energy storage module, and a circuit assembly. The housing assembly has a writing area for light to enter; the transparent electromagnetic induction film is connected to the housing assembly, and its effective input area corresponds to the writing area; the photovoltaic power generation module includes a photovoltaic film disposed on the side of the transparent electromagnetic induction film opposite to the writing area, and light entering from the writing area is received by the photovoltaic power generation module after passing through the transparent electromagnetic induction film; the circuit assembly is electrically connected to the transparent electromagnetic induction film, the photovoltaic power generation module, and the energy storage module. During use, the photovoltaic power generation module can also generate electricity normally, greatly improving the battery life of the handwriting device. Furthermore, the area of ​​the photovoltaic film can be made larger, thereby effectively improving the power generation efficiency of the photovoltaic film.

Description

Technical Field

[0001] This invention relates to the field of handwriting tablet technology, and more particularly to a low-light self-powered electromagnetic handwriting device. Background Technology

[0002] Existing electromagnetic induction (EMR) handwriting devices, such as digitizing tablets and electronic signature tablets, can use electromagnetic pens for writing. The handwriting device can sense the position of the electromagnetic pen in real time, and then calculate the writing trajectory of the electromagnetic pen. The written content can be transmitted to an external device for display.

[0003] One of the current pain points of handwriting devices is the inconvenience of power supply, requiring an external power cord or frequent charging, which makes it impossible to achieve true wireless freedom and long standby time.

[0004] To address these issues, some handwriting devices integrate photovoltaic power generation units to provide some of the energy.

[0005] In some designs, the photovoltaic (PV) power generation unit is located on the back of the device. This means that when writing, the PV unit cannot generate electricity because it cannot receive light. The handwriting device can only generate electricity when the back of the device is facing the sun. When generating electricity through solar energy, the handwriting device cannot be used, and it does not truly achieve long-term battery life. In addition, in order to avoid the generation of strong eddy currents in the large-size continuous metal conductors (such as busbars, metal encapsulation backplates, etc.) in the photovoltaic layer, which would seriously interfere with the working magnetic field of EMR and cause the writing function to fail, a magnetically conductive shielding layer (opaque) is often added between the PV power generation unit and the EMR layer, or the interlayer spacing is blindly increased (resulting in a bulky device). This increases the cost of the device and makes it even more cumbersome.

[0006] In some designs, the photovoltaic power generation unit is placed on the front of the handwriting device, on one side of the handwriting area. This results in an increased device size, and the photovoltaic power generation unit has a small area, so the power generation is far less than the power consumption of the handwriting device, resulting in extremely limited power supply capacity.

[0007] Furthermore, regardless of the chosen solution, it is difficult to meet power supply requirements in indoor application scenarios. Indoor environments are characterized by low light, and the power generation capacity of photovoltaic power generation units is far less than that under sunlight. Simply integrating photovoltaic units into handwriting devices cannot achieve efficient power supply in low-light indoor environments. According to GB7793—2025 "Hygienic Standards for Daylighting and Illumination in Primary and Secondary School Classrooms" and GB 50034—2013 "Standards for Lighting Design of Buildings," the average illuminance on desktops in ordinary office and teaching indoor environments should be maintained between 300 and 500 lx, with an illuminance uniformity ≥ 0.7. In actual use, artificial lighting mainly uses white LEDs (color temperature 4000~5000 K), supplemented by natural light (800~2000 lx in areas near windows). Therefore, the main illuminance range for low-light indoor conditions can be defined as 200~600 lx (≥ 200 lx in the darkest corners, and over 600 lx in light spots under lamps).

[0008] In addition, if the area of ​​the photovoltaic power generation unit is simply increased and placed below the EMR layer (electromagnetic induction layer) of the handwriting device, the large-size continuous metal conductors (such as busbars, metal encapsulation backplanes, etc.) in the photovoltaic layer will generate strong eddy currents, which will seriously interfere with the working magnetic field of the EMR and cause the writing function to fail.

[0009] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects.

[0010] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Summary of the Invention

[0011] The purpose of this invention is to provide a low-light self-powered electromagnetic handwriting device to improve its battery life in low-light environments.

[0012] To achieve the above-mentioned objectives, this invention proposes a low-light self-powered electromagnetic handwriting device, comprising:

[0013] The housing assembly includes a writing area for light to enter;

[0014] A transparent electromagnetic induction film is connected to the housing assembly, and its effective input area is set to correspond to the writing area;

[0015] A photovoltaic power generation module includes a photovoltaic power generation film disposed on the side of the transparent electromagnetic induction film opposite to the writing area, wherein light entering from the writing area is received by the photovoltaic power generation module after passing through the transparent electromagnetic induction film;

[0016] Energy storage modules; and,

[0017] The circuit assembly is electrically connected to the transparent electromagnetic induction film, the photovoltaic power generation module, and the energy storage module.

[0018] Furthermore, the photovoltaic power generation module includes an effective power generation area and an outer non-power generation area located outside the effective power generation area, and the area of ​​the effective power generation area is not less than 80% of the area of ​​the writing area.

[0019] Furthermore, the area of ​​the effective power generation area is larger than the area of ​​the writing area, the outer contour of the effective power generation area extends beyond the outer contour of the writing area, and the housing assembly also includes a transparent area located outside the writing area. The transparent area is a transparent solid part of the housing assembly, and the writing area is a through hole or a transparent solid part of the housing assembly.

[0020] Furthermore, the photovoltaic power generation module is a low-light power generation module, and the low-light power generation module is a perovskite photovoltaic power generation module.

[0021] Furthermore, the photovoltaic power generation module does not include a metal encapsulation plate, and the metal busbar of the photovoltaic power generation module is located in the peripheral non-power generation area of ​​the photovoltaic power generation module. The effective input area of ​​the transparent electromagnetic induction film is projected along the thickness direction of the housing assembly and is located within the effective power generation area of ​​the photovoltaic power generation module. In the thickness direction of the housing assembly, the distance between the transparent electromagnetic induction film and the photovoltaic power generation film is not less than 0.2 mm.

[0022] Furthermore, the transparent electromagnetic induction film is connected to the photovoltaic power generation module, and there is no storage space between them. In the thickness direction of the housing assembly, the distance D1 between the transparent electromagnetic induction film and the photovoltaic power generation film is 0.2mm~1.4mm. The housing assembly is supported on the side of the photovoltaic power generation module away from the transparent electromagnetic induction film.

[0023] Furthermore, the low-light self-powered electromagnetic handwriting device also includes a transparent cholesteric liquid crystal pressure-sensitive display panel connected to the housing assembly. The cholesteric liquid crystal pressure-sensitive display panel is disposed corresponding to the writing area and is located on the side of the transparent electromagnetic induction film away from the photovoltaic power generation module.

[0024] Furthermore, the combined light transmittance of the materials between the writing area and the photovoltaic film is not less than 45%.

[0025] Furthermore, the housing assembly includes a first housing and a second housing connected together. The first housing includes a first substrate and a first outer frame. The second housing includes a second substrate and a second outer frame disposed opposite to the first substrate. The first outer frame and the second outer frame are connected. The cholesteric liquid crystal pressure-sensitive display panel, the transparent electromagnetic induction film, and the photovoltaic power generation film are all located within the housing assembly. The cholesteric liquid crystal pressure-sensitive display panel is connected to the inner surface of the first substrate, and the photovoltaic power generation module is connected to the inner surface of the second substrate.

[0026] Furthermore, the circuit assembly includes a data transmission module for communicating with external devices.

[0027] Furthermore, in the thickness direction of the housing assembly, the transparent electromagnetic induction film and the photovoltaic power generation module are spaced apart, and the distance D1 between the transparent electromagnetic induction film and the photovoltaic power generation film is not less than 1.4 mm.

[0028] Furthermore, the low-light self-powered electromagnetic handwriting device also includes a receiving space for accommodating a sheet-like object. The receiving space is located between the transparent electromagnetic induction film and the photovoltaic power generation module. The housing assembly includes a socket communicating with the receiving space, through which the sheet-like object can be inserted into the receiving space.

[0029] The distance D1 between the transparent electromagnetic induction film and the photovoltaic power generation film is 1.4mm~10mm.

[0030] Furthermore, the low-light self-powered electromagnetic handwriting device includes a transparent rigid support plate connected to the housing assembly. The transparent rigid support plate is located between the transparent electromagnetic induction film and the photovoltaic power generation module. The transparent electromagnetic induction film is fixed to the side of the transparent rigid support plate facing away from the photovoltaic power generation module. The surface of the photovoltaic power generation module facing the transparent electromagnetic induction film is provided with a transparent protective layer. The receiving space is located between the transparent rigid support plate and the transparent protective layer.

[0031] Furthermore, the sheet is made of a transparent material, with non-transparent graphic content on its surface.

[0032] Compared with the prior art, the present invention has the following beneficial effects: According to at least one embodiment of the present invention, a low-light self-powered electromagnetic handwriting device includes a housing assembly, a transparent electromagnetic induction film, a photovoltaic power generation module, an energy storage module, and a circuit assembly. The housing assembly is provided with a writing area for light to enter; the transparent electromagnetic induction film is connected to the housing assembly, and its effective input area is correspondingly arranged with the writing area; the photovoltaic power generation module includes a photovoltaic film disposed on the side of the transparent electromagnetic induction film opposite to the writing area, and light entering from the writing area is received by the photovoltaic power generation module after passing through the transparent electromagnetic induction film; the circuit assembly is electrically connected to the transparent electromagnetic induction film, the photovoltaic power generation module, and the energy storage module.

[0033] Because light incident from the front of the housing component can reach the photovoltaic module, the module can generate electricity normally while the electromagnetic pen is used to write on the writing area of ​​the handwriting device. The handwriting device can generate electricity in real time, regardless of whether it is in use, under sunlight, greatly improving its battery life and effectively reducing charging needs. This prevents the device from becoming unusable due to frequent low battery or requiring an external power cord. Furthermore, the photovoltaic module is located on the side of the transparent electromagnetic induction film closer to the back of the handwriting device, rather than on the horizontal side. This allows for a significant increase in the area of ​​the photovoltaic film without increasing the size of the handwriting device, effectively improving its power generation efficiency. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of a low-light self-powered electromagnetic handwriting device according to some embodiments of the present invention.

[0035] Figure 2 yes Figure 1 The diagram shown is a schematic of the low-light self-powered electromagnetic handwriting device when the first housing is displayed.

[0036] Figure 3 This is a schematic diagram showing the positions of the effective input area and the border area of ​​the transparent electromagnetic induction film in some embodiments of the present invention.

[0037] Figure 4 yes Figure 1 The front view of the low-light self-powered electromagnetic handwriting device is shown.

[0038] Figure 5 It is along Figure 4 The sectional view obtained by cutting along section line AA.

[0039] Figure 6a yes Figure 5 A schematic diagram of the upper part of the structure shown.

[0040] Figure 6b yes Figure 6a Enlarged view of section I in the middle.

[0041] Figure 7 This is a schematic diagram showing the location of the effective power generation area and the peripheral non-power generation area of ​​a photovoltaic power generation module in some embodiments of the present invention.

[0042] Figure 8 This is a schematic diagram showing the positions of the writing area, effective power generation area, and transparent area in some embodiments of the present invention.

[0043] Figure 9 This is a schematic diagram showing the positions of the writing area and the transparent area in some embodiments of the present invention. In the diagram, the upper surfaces of the writing area and the transparent area are flush.

[0044] Figure 10 This is a schematic diagram showing the positions of the writing area and the transparent area in some embodiments of the present invention. In the diagram, the writing area protrudes outward from the transparent area.

[0045] Figure 11 This is a schematic diagram showing the positions of the writing area and the transparent area in some embodiments of the present invention. In the diagram, the writing area is recessed into the transparent area.

[0046] Figure 12 This is a schematic diagram showing the positions of the writing area and the transparent area in some embodiments of the present invention. In the diagram, the writing area is a through hole.

[0047] Figure 13 This is a schematic diagram of a transparent electromagnetic induction film and a photovoltaic power generation module being directly bonded together using transparent optical adhesive in some embodiments of the present invention.

[0048] Figure 14 It is along Figure 4 A sectional view obtained by cutting along the BB section line.

[0049] Figure 15 yes Figure 14 Enlarged view of Part II.

[0050] Figure 16 This is a schematic diagram of some embodiments of the present invention where the writing area is a solid portion.

[0051] Figure 17 This is a schematic diagram of a handwriting device including a display panel in some embodiments of the present invention. Detailed Implementation

[0052] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0053] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] Some embodiments of the present invention propose a low-light self-powered electromagnetic handwriting device (hereinafter referred to as the handwriting device). Low-light self-powered means that the handwriting device can generate electricity under low-light conditions to improve battery life. For example... Figures 1 to 6b As shown, the handwriting device includes a housing assembly 1, a transparent electromagnetic induction film 2, a photovoltaic power generation module 3, an energy storage module 4, and a circuit assembly 5.

[0056] The housing assembly 1 has a writing area 12 for light to enter. The writing area 12 can be a perforated through-hole or made of a transparent material, such as a transparent plate. The surface where the writing area 12 is located is the front of the housing assembly 1. When the handwriting device is in use, the electromagnetic pen writes on the writing area 12.

[0057] like Figure 3As shown, the transparent electromagnetic induction film 2 includes an effective input area 2a and a border area 2b. The effective input area 2a is equipped with an array of induction coils. When the electromagnetic pen moves within this area, the coil array beneath the film can stably sense the range of the pen tip's coordinates. The border area 2b is used for antenna leads and connecting to a driver IC; it cannot locate the coordinate position of the electromagnetic pen. The transparent electromagnetic induction film 2 is connected to the housing assembly 1, and its effective input area 2a is correspondingly positioned to the writing area 12. Their projections along the thickness direction of the housing assembly 1 at least partially overlap. By correspondingly positioning the effective input area 2a and the writing area 12, the transparent electromagnetic induction film 2 can sense when the electromagnetic pen writes in the writing area 12.

[0058] The photovoltaic power generation module 3 includes a photovoltaic film, which is disposed on the side of the transparent electromagnetic induction film 2 opposite to the writing area 12. Light incident from the writing area 12 is received by the photovoltaic film after passing through the transparent electromagnetic induction film 2. The photovoltaic film can generate electricity through the photovoltaic effect.

[0059] like Figures 4 to 6a As shown, the energy storage module 4 is used to store electrical energy, which may be, for example, a rechargeable battery that can store the electrical energy generated by the photovoltaic film for use by the handwriting device. Optionally, the energy storage module 4 itself can also be charged by external power to quickly store electrical energy.

[0060] The circuit assembly 5 is electrically connected to the transparent electromagnetic induction film 2, the photovoltaic power generation module 3, and the energy storage module 4, so as to input the power generated by the photovoltaic power generation module 3 into the energy storage module 4 for storage, and to transmit the power of the energy storage module 4 and the photovoltaic power generation film to the power-consuming components such as the transparent electromagnetic induction film 2.

[0061] Since light incident from the front of the housing component 1 can reach the photovoltaic film, the photovoltaic module 3 can also generate electricity normally when writing on the writing area 12 of the handwriting device with an electromagnetic pen. The handwriting device can generate electricity in real time, regardless of whether it is in use, under sunlight, greatly improving its battery life and effectively reducing charging needs. This prevents the handwriting device from becoming unusable due to frequent low battery levels or requiring an external power cord. Furthermore, the photovoltaic module 3 is located on the side of the transparent electromagnetic induction film 2 closer to the back of the handwriting device, rather than on the horizontal side. This allows for a significant increase in the area of ​​the photovoltaic film without increasing the size of the handwriting device, effectively improving the power generation efficiency of the photovoltaic module 3.

[0062] In some embodiments, the area of ​​the effective input region 2a of the transparent electromagnetic induction film 2 is not less than 80% of the area of ​​the writing region 12, so that writing in the writing region 12 can be reliably sensed. Further optionally, the area of ​​the effective input region 2a of the transparent electromagnetic induction film 2 is not less than 100% of the area of ​​the writing region 12. For example, the effective input region 2a is aligned with the outer contour of the writing region 12 (both have the same area), or the projection of the writing region 12 along the thickness direction of the housing assembly 1 falls within the effective input region 2a (the area of ​​the effective input region 2a is larger than that of the writing region 12), so that input at any position in the writing region 12 can be reliably sensed. The thickness direction of the housing assembly 1 is consistent with the thickness direction of the transparent electromagnetic induction film 2, the photovoltaic film, etc.

[0063] like Figure 7 As shown, the photovoltaic power generation module 3 includes an effective power generation area 3a and an outer non-power generation area 3b located around the effective power generation area 3a. The effective power generation area 3a refers to the region in the photovoltaic film that receives light and generates electricity. For example, it is the region in the photovoltaic film where a photovoltaic active layer (such as an amorphous silicon layer, CIGS layer, or perovskite layer) is set and a PN junction or heterojunction structure is formed. When ambient light is incident on this region, photons are absorbed by the active layer and generate electron-hole pairs. Under the action of the built-in electric field, charge separation is achieved, and the photocurrent is output after being collected by the electrodes. The outer non-power generation area 3b is located around the effective power generation area 3a and includes one or more of the following: laser etching dead zones (P1 / P2 / P3 etching bands), busbar arrangement areas, and encapsulation sealing areas set along the four sides of the effective power generation area 3a. No active layer that can participate in power generation is set in this region, or the active layer is etched away / covered by a light-shielding layer, so no effective photocurrent is generated. It is mainly used for wiring, busbars, sealing, etc.

[0064] Optionally, the area of ​​the effective power generation zone 3a is not less than 80% of the area of ​​the writing area 12, so that the effective power generation zone 3a has a large area. Further optional, such as Figure 8 As shown, the projection of the outer contour of the writing area 12 along the thickness direction of the housing assembly 1 is located within the effective power generation area 3a. At this time, the ratio of the area of ​​the effective power generation area 3a to the area of ​​the writing area 12 is greater than or equal to 100%. Light passing through the writing area 12 can be used by the effective power generation area 3a to generate electricity, resulting in higher power generation efficiency.

[0065] In some embodiments, such as Figure 8 As shown, the area of ​​the effective power generation area 3a is larger than the area of ​​the writing area 12, and the outer contour of the effective power generation area 3a extends beyond the outer contour of the writing area 12. The housing assembly 1 also has a transparent area 13 located outside the writing area 12. Figure 8In the diagram, the approximate extent of the effective power generation area 3a is indicated by a double-dotted line, and the approximate extent of the transparent area 13 is indicated by a dashed line. The transparent area 13 corresponds to the portion of the effective power generation area 3a that extends beyond the written area 12. Their projections along the thickness direction of the housing component 1 at least partially overlap. Light can pass through the transparent area 13 to illuminate the effective power generation area 3a, increasing the light-receiving area of ​​the effective power generation area 3a. This allows for full utilization of the frame size of the housing component 1, increasing the size of the photovoltaic power generation module 3, and further improving power generation. Optionally, the projection of the effective power generation area 3a is located within the transparent area 13 along the thickness direction of the housing component 1 to fully utilize the entire area of ​​the effective power generation area 3a.

[0066] In some examples, such as Figure 9 As shown, both the transparent area 13 and the writing area 12 are transparent solid parts of the housing assembly 1 (which can be integrally formed or separately connected). Since the housings corresponding to these two parts are made of transparent material, light can pass through them. It can be understood that the housing part of the housing assembly 1 located outside the transparent area 13 can be opaque or transparent. When the housing part of the housing assembly 1 located outside the transparent area 13 is also transparent, the housing assembly 1 can be made entirely of transparent material, or the housing (first housing 10) where the transparent area 13 is located can be made entirely of transparent material.

[0067] In other examples, such as Figure 10 and Figure 11 As shown, both the transparent area 13 and the writing area 12 are transparent solid parts of the housing assembly 1. To facilitate the identification of the writing area 12, the housing assembly 1 is provided with a clear area indicator structure 120 to mark the writing area 12. The area indicator structure 120 can be, for example, a printed outline or a stepped structure. For example, the writing area 12 can be set to be recessed or protruding from the transparent area 13 to form a step, or a ring of outwardly protruding bosses or inwardly recessed grooves can be provided between the writing area 12 and the transparent area 13 to form a step, etc.

[0068] In some other examples, such as Figure 5 , Figure 6a , Figure 6b and Figure 12 As shown, the transparent area 13 is the transparent solid part of the housing assembly 1, and the writing area 12 is a through hole. At this time, the inner wall of the through hole naturally forms the area indicator structure of the writing area 12. Writing can be conveniently done in the writing area 12.

[0069] It is understandable that when the writing area 12 is a transparent solid part of the shell assembly 1, the area indicator structure 120 can be set regardless of whether the shell assembly 1 has a transparent area 13.

[0070] In this invention, the photovoltaic power generation module 3 is a low-light power generation module, designed to maintain good power generation efficiency even in low-light environments. Examples of low-light power generation modules include perovskite photovoltaic modules, OPV (organic photovoltaic) photovoltaic modules, and a-Si amorphous silicon photovoltaic modules. Further options include perovskite photovoltaic modules or OPV photovoltaic modules, with perovskite photovoltaic modules being the most suitable. Perovskite has the highest power generation efficiency, with a power density approximately 2 to 2.5 times that of a-Si and 1.2 to 1.8 times that of OPV at 200-600 lx. Therefore, perovskite photovoltaic modules are suitable for devices with limited space, maximizing power output with minimal area, providing reliable operation in low-light environments, and offering the lowest cost per unit of power generation among the four types of photovoltaic modules mentioned above. Of course, the photovoltaic power generation module 3 is not limited to the types listed above, and the possibility of future developments of photovoltaic modules with even better performance cannot be ruled out.

[0071] When the transparent electromagnetic induction film 2 is working, the large-size continuous metal conductors (such as busbars, metal encapsulation backplanes, etc.) of the photovoltaic power generation module 3 are prone to generating strong eddy currents, which seriously interfere with the working magnetic field of the EMR and cause the writing function to fail. In order to solve this problem, the present invention proposes the following two solutions.

[0072] Option 1

[0073] The photovoltaic power generation module 3 is configured not to use metal plate encapsulation (i.e., excluding metal encapsulation plates), but is encapsulated using plastic, glass, or film (such as PET, ETFE, PET, PI, or PP). Simultaneously, the metal busbar of the photovoltaic power generation module 3 is located outside the effective power generation area 3a (i.e., located in the peripheral non-power generation area 3b). The projection of the effective input area 2a along the thickness direction lies within the effective power generation area 3a. Therefore, the effective input area 2a is not affected by metal materials such as the metal busbar within the peripheral non-power generation area 3b. After removing the influence of the metal backplate and metal busbar, the residual interference of the effective power generation area 3a on the transparent electromagnetic induction film 2 mainly comes from the ultra-thin metal grid lines or transparent conductive film with submicron / micron thickness, and its interference is extremely weak. By setting the distance between the transparent electromagnetic induction film 2 and the photovoltaic power generation film to greater than or equal to 0.2 mm in the thickness direction of the housing assembly 1, the transparent electromagnetic induction film 2 can operate stably and reliably.

[0074] In some embodiments, such as Figure 13As shown, in the thickness direction of the housing assembly 1, the distance D1 between the transparent electromagnetic induction film 2 and the photovoltaic power generation film is 0.2mm~1.4mm. The transparent electromagnetic induction film 2 is connected to the photovoltaic power generation module 3, and there is no storage space between them. For example, they can be bonded together using optically transparent adhesive 20. The distance between the transparent electromagnetic induction film 2 and the photovoltaic power generation film can be adjusted by adjusting the thickness of the optically transparent adhesive 20. The housing assembly 1 is supported on the side of the photovoltaic power generation module 3 away from the transparent electromagnetic induction film 2, that is, supported at the bottom of the housing assembly 1. When the writing area 12 is a through hole, the electromagnetic pen can be supported by the housing assembly 1 located at the bottom of the photovoltaic power generation module 3 when writing. Since the photovoltaic power generation module 3 and the transparent electromagnetic induction film 2 are directly connected by the optically transparent adhesive 20, the overall thickness of the low-light self-powered handwriting device is smaller, which facilitates the realization of a thinner and lighter design. It is understood that, in addition to setting the optically transparent adhesive 20, other transparent material layers can also be set to increase the distance D1 between the transparent electromagnetic induction film 2 and the photovoltaic power generation module 3.

[0075] Option 2

[0076] In the thickness direction of the housing assembly 1, the distance D1 between the transparent electromagnetic induction film 2 and the photovoltaic film is not less than 1.4mm. By increasing the distance, the electromagnetic interference of the continuous metal on the photovoltaic module 3 to the transparent electromagnetic induction film 2 can be significantly reduced, enabling the transparent electromagnetic induction film 2 to work stably. It is understood that Scheme 2 and Scheme 1 can be used in combination. While increasing the distance, the metal plate of the photovoltaic module 3 can be eliminated, and the busbar can be placed in the frame area 2b. This results in better working stability and reliability of the transparent electromagnetic induction film 2. Optionally, the distance D1 can be 1.4mm to 10mm to prevent the thickness of the housing assembly 1 from becoming too large.

[0077] Optionally, the transparent electromagnetic induction film 2 and the photovoltaic power generation module 3 are spaced apart, such as... Figure 14 and Figure 15 As shown, the handwriting device also includes a receiving space 30 for accommodating sheet-like objects, located between the transparent electromagnetic induction film 2 and the photovoltaic power generation module 3. The housing assembly 1 also includes an insertion port 14 communicating with the receiving space 30, allowing the sheet-like object to pass through and be inserted into the receiving space 30. The sheet-like object is sheet-like, such as paper, card, or film, and contains graphic information. Common sheet-like objects include paper or cards printed with exercises, pictures, or calligraphy templates. The human eye can observe the sheet-like object in the insertion port 14 through the writing area 12 and the transparent electromagnetic induction film 2, enabling the use of an electromagnetic pen for tracing, answering questions, and other operations. This fully utilizes the receiving space 30 while enriching the functionality of the handwriting device.

[0078] In some embodiments, such as Figure 15 As shown, a transparent protective layer 61 is provided on the surface of the photovoltaic power generation module 3 facing the transparent electromagnetic induction film 2. The transparent protective layer 61 can protect the surface of the photovoltaic power generation module 3 and prevent scratches on the photovoltaic power generation module 3, thus preventing it from affecting the power generation efficiency. The transparent protective layer 61 is made of a transparent material, such as PMMA.

[0079] In some embodiments, the handwriting device further includes a transparent rigid support plate 60 located between the transparent electromagnetic induction film 2 and the photovoltaic power generation module 3. The transparent rigid support plate 60 is spaced apart from the photovoltaic power generation module 3, and a receiving space 30 is located between the transparent rigid support plate 60 and the photovoltaic power generation module 3. The transparent rigid support plate 60 can prevent the transparent electromagnetic induction film 2 from contacting the sheet-like object and prevent scratches on the transparent electromagnetic induction film 2 when inserting or removing the sheet-like object. Optionally, the transparent rigid support plate 60 is connected to the housing assembly 1 and can provide support for the transparent electromagnetic induction film 2. Figure 15 As shown, the transparent rigid support plate 60 has a cavity 600 for accommodating the transparent electromagnetic induction film 2. The portion of the cavity 600 located outside the cavity 600 is connected to the inner surface of the housing assembly 1. When the writing area 12 is a through hole, the transparent rigid support plate 60 can provide support. It is understood that, as... Figure 16 As shown, when the writing area 12 is a solid part of the housing assembly 1, the electromagnetic pen writes directly on the surface of the housing assembly 1 and is directly supported by the housing assembly 1.

[0080] Understandably, when the sheet is inserted into the socket 14, it will block the photovoltaic power generation module 3. To improve the power generation efficiency of the photovoltaic power generation module 3 during copying, in some embodiments, the sheet is made of transparent material, and its surface has non-transparent graphic content, which refers to information such as graphics or text. Since the sheet is transparent except for the graphic area, light can still pass through the transparent part, thereby effectively increasing the power generation efficiency during copying. When the photovoltaic power generation module 3 extends outside the writing area 12, and the housing assembly 1 has a transparent area 13 located outside the writing area 12, the sheet generally will not completely block the photovoltaic power generation module 3 corresponding to the transparent area 13. In this case, even if the sheet is not made of transparent material, part of the photovoltaic power generation module 3 can still generate electricity. When the sheet is made of transparent material, the power generation efficiency is higher.

[0081] Housing assembly 1 includes one or more housings, for example, it can be formed by connecting two or more housings, such as... Figure 1 , Figure 5 , Figure 6a and Figure 6bAs shown, the housing assembly 1 includes a first housing 10 and a second housing 11 connected together. The first housing 10 includes a first substrate 100 and a first outer frame 101. The second housing 11 includes a second substrate 110 and a second outer frame 111 disposed opposite to the first substrate 100 (in the thickness direction of the housing assembly 1). The first outer frame 101 is connected to the outer edge of the first substrate 100, and the second outer frame 111 is connected to the outer edge of the second substrate 110. The first outer frame 101 and the second outer frame 111 are connected together. The transparent electromagnetic induction film 2 and the photovoltaic power generation module 3 are both located inside the housing assembly 1. The writing area 12 and the transparent area 13 are both disposed on the first substrate 100 of the first housing 10. The transparent electromagnetic induction film 2 and the transparent rigid support plate 60 are both connected to the first substrate 100. The photovoltaic power generation module 3 is connected to the second substrate 110 and is supported by the second substrate 110. Of course, the photovoltaic power generation module 3 may not be connected to the second substrate 110, but to the transparent electromagnetic induction film 2 or the first substrate 100. When it is necessary to form a receiving space 30, spacers (such as columnar members, strips, etc.) located on the outer edge of the photovoltaic power generation module 3 can be set to separate the transparent electromagnetic induction film 2 and the photovoltaic power generation module 3 to form a receiving space 30.

[0082] like Figure 2 As shown, circuit component 5 includes circuit board 50, control chip 51, and data transmission module. The data transmission module is used for communication with external devices. When the electromagnetic pen writes on the transparent electromagnetic induction film 2, the transparent electromagnetic induction film 2 generates an induction signal. This signal is processed by the control chip 51 and then transmitted to the external device through the data transmission module. The external device includes, but is not limited to, cloud servers and terminal devices, such as mobile phones, tablets, or computers. The content written on the transparent electromagnetic induction film 2 can be recorded on the external device in real time through the data transmission module. It can be understood that the written content can be text, lines, etc., and is related to the actual writing trajectory of the electromagnetic pen.

[0083] In some embodiments, the data transmission module includes a wireless communication module and / or a data interface 52. The data interface 52 is exposed outside the housing assembly 1 and is used to connect to an external device via a data cable to display the content written on the handwriting device on the display screen of the terminal device in real time. For example, when the handwriting device is connected to a computer, the content drawn on the handwriting device can be displayed on the computer in real time. In this case, the handwriting device can be used as a graphics tablet. The wireless communication module can communicate wirelessly with the external device, and it can be a Wi-Fi module, a Bluetooth module, or a cellular module (such as 4G / 5G). The wireless communication module can wirelessly send the written content to the external device when the data cable is not connected, and can also display the written content on the display screen of the external device in real time.

[0084] After setting up the data transmission module, although the written content can be synchronously displayed on the external display screen, it is still impossible to display the written content at the location written by the electromagnetic pen, resulting in hand-eye coordination difficulties and poor writing comfort. In some embodiments, the low-light self-powered electromagnetic handwriting device also includes a cholesteric liquid crystal pressure-sensitive display panel 7 connected to the housing assembly 1 (specifically, the first substrate 100 of the housing assembly 1). The cholesteric liquid crystal pressure-sensitive display panel 7 is correspondingly arranged with the writing area 12 (the projections of the two along the thickness direction of the housing assembly 1 at least partially overlap, and optionally, their outer contours coincide), and is located on the side of the transparent electromagnetic induction film 2 facing away from the photovoltaic film. The cholesteric liquid crystal pressure-sensitive display panel 7 is transparent and has bistable states (P state and FC state). Initially, the cholesteric liquid crystal pressure-sensitive display panel 7 is in the FC state. When pressure is applied, it can switch from the FC state to the P state, thereby displaying the content at the pressure location. When the electromagnetic pen writes on the surface of the cholesteric liquid crystal pressure-sensitive display panel 7, the written content can be displayed on the surface of the cholesteric liquid crystal pressure-sensitive display panel 7 in real time, realizing a hand-eye coordinated writing experience.

[0085] Because the display panel 7 (for ease of description, the cholesteric liquid crystal pressure-sensitive display panel 7 is simply referred to as the display panel) is transparent, light can still pass through the display panel 7 and components such as the transparent electromagnetic induction film 2 and be received by the photovoltaic power generation module 3, without affecting the normal power generation of the photovoltaic power generation module 3 during the use of the handwriting tablet. Furthermore, the cholesteric liquid crystal pressure-sensitive display panel 7 is bistable, requiring only one voltage pulse to switch it from the P state to the FC state when a voltage is applied. Therefore, it has extremely energy-saving characteristics, and setting the display panel 7 in a handwriting device will not significantly impact the device's battery life. This is something other display panels such as TFT-LCD, Mini-LED LCD, OLED / AMOLED, Micro-LED, and MIP (Memory-in-Pixel reflective LCD) cannot achieve. At the same time, the cost of the cholesteric liquid crystal pressure-sensitive display panel 7 is also very low, and its installation in a handwriting device will not excessively increase the device cost.

[0086] Understandably, the cholesteric liquid crystal pressure-sensitive display panel 7 needs to directly contact the electromagnetic pen to receive pressure; therefore, the cholesteric liquid crystal pressure-sensitive display panel 7 is exposed outside the housing assembly 1. In some embodiments, the writing area 12 is a through hole, in which case, such as Figure 17 As shown, the display panel 7 can be disposed inside the housing assembly 1 and connected to the inner surface of the housing assembly 1. In the figure, the display panel 7 is connected to the transparent electromagnetic induction film 2 (e.g., by optical adhesive) and is located on the side of the transparent electromagnetic induction film 2 that faces away from the photovoltaic power generation module 3.

[0087] It is understandable that the low cost of cholesteric liquid crystal pressure-sensitive display panels makes the handwriting device of this application have a low cost.

[0088] The handwriting device also includes a button 15 electrically connected to the circuit component 5. The button 15 is used to clear the screen of the display panel 7, so that the display panel 7 is switched from the P state to the FC state.

[0089] It is understandable that the light transmittance of materials such as the transparent electromagnetic induction film 2, transparent optical adhesive, and transparent rigid support plate 60 can be very high. For example, the light transmittance of the transparent electromagnetic induction film 2 can reach over 80%, and the light transmittance of the optical transparent adhesive can reach over 99%. Setting the display panel 7 will reduce the overall light transmittance to some extent, but the photovoltaic power generation module 3 can still operate normally and generate electricity, only with reduced power generation efficiency. Some display panels 7 can achieve a light transmittance (in FC state) of over 65%. In this case, the combined light transmittance of the display panel 7 and the transparent electromagnetic induction film 2 can reach over 52%, still exhibiting good light transmittance. Optionally, the combined light transmittance of the materials between the writing area 12 and the photovoltaic power generation module 3 (excluding sheet-like materials; when the writing area 12 is a solid material, it must include the writing area 12 itself) should be no less than 45% to ensure that the photovoltaic power generation module 3 has good power generation efficiency. Further optionally, the combined light transmittance of the materials between the writing area 12 and the photovoltaic power generation module 3 should be no less than 50% to further improve power generation efficiency.

[0090] Furthermore, when the photovoltaic power generation module 3 extends outside the writing area 12, and the housing assembly 1 has a transparent area 13 located outside the writing area 12, the display panel 7 will not affect the power generation efficiency of the photovoltaic power generation module 3 corresponding to the transparent area 13, resulting in higher power generation efficiency.

[0091] Understandably, the photovoltaic power generation module 3 is typically dark-colored, which serves as a dark background for the display panel 7 to enhance contrast and make the written content on the display panel 7 clearer. In some embodiments, the housing assembly 1, except for the writing area 12 and the transparent area 13, is made of an opaque dark material (such as black) to further enhance contrast. In other embodiments, the housing assembly 1 may also be made dark-colored (made of an opaque dark material) only for the portion corresponding to the photovoltaic power generation module 3 (e.g., the second substrate 110).

[0092] In use, the electromagnetic pen is used to write on the display panel 7, and the written content is displayed on the display panel 7 in real time. Simultaneously, the writing is sensed by the transparent electromagnetic induction film 2 and transmitted to an external device via the data transmission module, where it can be displayed or saved. The order of the written content can be saved for later review. This low-light, self-powered electromagnetic handwriting device is particularly suitable for realizing educational informatization. When practicing handwriting, it can reproduce the stroke order and problem-solving process, making it easier for teachers or parents to judge whether the writing is standardized and accurate, and whether the problem-solving approach is logical. Traditional devices can only save the final answer and cannot show the writing order or whether the writing was correct.

[0093] Understandably, since only components such as the photovoltaic power generation module 3, the transparent electromagnetic induction film 2, and the display panel 7 need to be stacked, and these components are all relatively thin, the handwriting device can be made very thin, achieving extreme thinness. For example, the thickness of the photovoltaic power generation module 3 is about 0.6 mm, the thickness of the transparent electromagnetic induction film 2 is about 50 μm, and the thickness of the display panel 7 is about 250 μm. The optically transparent adhesive used to bond the transparent electromagnetic induction film 2 to the housing assembly 1 / transparent rigid support plate 60 / display panel 7 is generally 75 μm. The total thickness of these components is very small. The total thickness of the handwriting device mainly depends on the spacing between the photovoltaic power generation module 3 and the transparent electromagnetic induction film 2, as well as the wall thickness of the housing, allowing for a very thin overall design.

[0094] It should be noted that, in the absence of conflict, the various embodiments described herein can be combined with each other to obtain more implementation schemes.

[0095] The above are merely specific embodiments of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. A weak light self-powered electromagnetic handwriting device, characterized in that, include: The housing assembly (1) has a writing area (12) for light to enter; A transparent electromagnetic induction film (2) is connected to the housing assembly (1), and its effective input area (2a) is correspondingly set with the writing area (12); The photovoltaic power generation module (3) includes a photovoltaic power generation film disposed on the side of the transparent electromagnetic induction film (2) away from the writing area (12). Light rays entering from the writing area (12) are received by the photovoltaic power generation module (3) after passing through the transparent electromagnetic induction film (2). Energy storage module (4); and, The circuit assembly (5) is electrically connected to the transparent electromagnetic induction film (2), the photovoltaic power generation module (3) and the energy storage module (4).

2. The weak light self-powered electromagnetic handwriting device of claim 1, wherein, The photovoltaic power generation module (3) includes an effective power generation area (3a) and an outer non-power generation area (3b) located outside the effective power generation area (3a). The area of ​​the effective power generation area (3a) is not less than 80% of the area of ​​the writing area (12).

3. The weak light self-powered electromagnetic handwriting device of claim 2, wherein, The area of ​​the effective power generation area (3a) is larger than the area of ​​the writing area (12), the outer contour of the effective power generation area (3a) extends beyond the outer contour of the writing area (12), the housing assembly (1) also includes a transparent area (13) located outside the writing area (12), the transparent area (13) is a transparent solid part of the housing assembly (1), and the writing area (12) is a through hole or a transparent solid part of the housing assembly (1).

4. The low-light self-powered electromagnetic handwriting device as described in claim 1, characterized in that, The photovoltaic power generation module (3) is a low-light power generation module, and the low-light power generation module is a perovskite photovoltaic power generation module.

5. The low-light self-powered electromagnetic handwriting device as described in claim 1, characterized in that, The photovoltaic power generation module (3) does not include a metal encapsulation plate, and the metal busbar of the photovoltaic power generation module (3) is located in the outer non-power generation area (3b) of the photovoltaic power generation module (3). The effective input area (2a) of the transparent electromagnetic induction film (2) is projected along the thickness direction of the housing assembly (1) and is located within the effective power generation area (3a) of the photovoltaic power generation module (3). In the thickness direction of the housing assembly (1), the distance between the transparent electromagnetic induction film (2) and the photovoltaic power generation film is not less than 0.2mm.

6. The low-light self-powered electromagnetic handwriting device as described in claim 5, characterized in that, The transparent electromagnetic induction film (2) is connected to the photovoltaic power generation module (3), and there is no storage space between them. In the thickness direction of the housing assembly (1), the distance D1 between the transparent electromagnetic induction film (2) and the photovoltaic power generation film is 0.2mm~1.4mm. The housing assembly (1) is supported on the side of the photovoltaic power generation module (3) away from the transparent electromagnetic induction film (2).

7. The low-light self-powered electromagnetic handwriting device as described in claim 1, characterized in that, It also includes a transparent cholesteric liquid crystal pressure-sensitive display panel (7) connected to the housing assembly (1), the cholesteric liquid crystal pressure-sensitive display panel (7) being disposed corresponding to the writing area (12) and located on the side of the transparent electromagnetic induction film (2) away from the photovoltaic power generation module (3).

8. The low-light self-powered electromagnetic handwriting device as described in claim 7, characterized in that, The combined light transmittance of the materials between the writing area (12) and the photovoltaic film is not less than 45%.

9. The low-light self-powered electromagnetic handwriting device as described in claim 7, characterized in that, The housing assembly (1) includes a first housing (10) and a second housing (11) connected together. The first housing (10) includes a first substrate (100) and a first outer frame (101). The second housing (11) includes a second substrate (110) and a second outer frame (111) disposed opposite to the first substrate (100). The first outer frame (101) and the second outer frame (111) are connected together. The cholesteric liquid crystal pressure-sensitive display panel (7), the transparent electromagnetic induction film (2) and the photovoltaic power generation film are all located inside the housing assembly (1). The cholesteric liquid crystal pressure-sensitive display panel (7) is connected to the inner surface of the first substrate (100), and the photovoltaic power generation module (3) is connected to the inner surface of the second substrate (110).

10. The low-light self-powered electromagnetic handwriting device as described in claim 1, characterized in that, The circuit assembly (5) includes a data transmission module for communicating with external devices.

11. The low-light self-powered electromagnetic handwriting device according to any one of claims 1 to 5 and 7 to 10, characterized in that, In the thickness direction of the housing assembly (1), the transparent electromagnetic induction film (2) is spaced apart from the photovoltaic power generation module (3), and the distance D1 between the transparent electromagnetic induction film (2) and the photovoltaic power generation film is not less than 1.4 mm.

12. The low-light self-powered electromagnetic handwriting device as described in claim 11, characterized in that, The weak light self-powered electromagnetic handwriting device also includes a receiving space (30) for receiving sheet-like objects. The receiving space (30) is located between the transparent electromagnetic induction film (2) and the photovoltaic power generation module (3). The housing assembly (1) includes a socket (14) communicating with the receiving space (30). The sheet-like objects can be inserted into the receiving space (30) through the socket (14). The distance D1 between the transparent electromagnetic induction film (2) and the photovoltaic power generation film is 1.4mm~10mm.

13. The low-light self-powered electromagnetic handwriting device as described in claim 12, characterized in that, It includes a transparent rigid support plate (60) connected to the housing assembly (1), the transparent rigid support plate (60) being located between the transparent electromagnetic induction film (2) and the photovoltaic power generation module (3), the transparent electromagnetic induction film (2) being fixed to the side of the transparent rigid support plate (60) facing away from the photovoltaic power generation module (3), the photovoltaic power generation module (3) having a transparent protective layer (61) on its surface facing the transparent electromagnetic induction film (2), and the receiving space (30) being located between the transparent rigid support plate (60) and the transparent protective layer (61).

14. The low-light self-powered electromagnetic handwriting device as described in claim 12, characterized in that, The sheet-like object is made of transparent material, with non-transparent graphic content on its surface.

Images