Multi-screen folding liquid crystal handwriting board

Abstract

The utility model discloses a multi-screen folding liquid crystal handwriting board which comprises a pair of assembly substrates, a pair of first liquid crystal handwriting films, a pair of control circuit boards, a pair of first face stickers, a pair of second face stickers and a handwriting pen. A hinge mechanism is connected between the pair of assembly substrates, first assembly grooves are formed in the inner side surfaces of the assembly substrates, mounting grooves are formed in the outer side surfaces of the assembly substrates, a plurality of through holes are formed in the assembly substrates in a penetrating manner, and the first assembly grooves are communicated with the mounting grooves through the through holes; the pair of first liquid crystal handwriting films are installed in the pair of first assembling grooves respectively, a plurality of first pins are connected to the first liquid crystal handwriting films, first copper nets are connected to the first pins, and the first copper nets penetrate through the penetrating holes. The frame of the liquid crystal screen of the handwriting board can be reduced, the proportion of the liquid crystal screen can be increased, the use experience of a user can be further improved, meanwhile, a plurality of liquid crystal screens can be additionally arranged to achieve the effect of increasing the writing capacity of the handwriting board, and therefore the use requirement of the user can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of writing tablets, and particularly relates to a multi-screen folding liquid crystal writing tablet. Background Art

[0002] A liquid crystal writing tablet is an electronic device that uses high-tech flexible liquid crystal technology and relies on pressure sensing to display characters, patterns, and graphics, and can complete writing with a simple swipe or press. Currently, with the development of the electronics industry, due to its reusable erasable feature, the electronic liquid crystal writing tablet is widely used as an electronic scratch paper for writing, drawing, doodling, etc.

[0003] However, the border of the traditional liquid crystal writing tablet is very wide, resulting in a relatively poor user experience. In addition, the wide border also reduces the proportion of the liquid crystal screen, leading to a very small writing capacity of the writing tablet, which is difficult to meet the user's needs.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a multi-screen folding liquid crystal writing tablet.

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the present utility model and should not be construed as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a multi-screen folding liquid crystal writing tablet, which can solve the problems of poor user experience and small writing capacity caused by the wide border of the writing tablet.

[0007] To achieve the above purpose, the technical solution provided by a specific embodiment of the present utility model is as follows:

[0008] A multi-screen folding liquid crystal writing tablet includes: a pair of assembly substrates, a pair of first liquid crystal writing films, a pair of control circuit boards, a pair of first stickers, a pair of second stickers, and a writing pen;

[0009] An articulated mechanism is connected between the pair of assembly substrates. The inner side of the assembly substrate is provided with a first assembly groove, the outer side of the assembly substrate is provided with a mounting groove, and a plurality of through holes are provided through the assembly substrate. The first assembly groove is connected to the mounting groove through the through holes;

[0010] A pair of the first liquid crystal writing films are respectively installed in the pair of first assembly grooves. A plurality of first pins are connected to the first liquid crystal writing film, and a first copper mesh is connected to the first pins. The first copper mesh passes through the through holes;

[0011] A pair of the control circuit boards are respectively installed in a pair of the installation grooves. A plurality of first pads are provided on the control circuit board, and the first pads are electrically connected to the first copper mesh.

[0012] The first surface mount covers the first pin, and the second surface mount covers the control circuit board.

[0013] The stylus is installed on the side wall of the assembly substrate, and a magnet is installed on the top of the stylus.

[0014] In one or more embodiments of the present invention, the hinge mechanism includes two pairs of connecting sleeves. Each pair of the connecting sleeves is installed in a staggered manner and is integrally formed with the assembly substrate. The connecting sleeves are installed on the mutually adjacent sides of a pair of assembly substrates, and the two pairs of connecting sleeves are respectively arranged at the upper and lower edge positions of the assembly substrate.

[0015] In one or more embodiments of the present invention, both the assembly substrate and the connecting sleeves are injection-molded from ABS material or HIPS material.

[0016] In one or more embodiments of the present invention, a knurled rotating shaft is connected between a pair of the connecting sleeves. The knurled rotating shaft is made of stainless steel. Through the mutual cooperation of the connecting sleeve and the knurled rotating shaft, a pair of assembly substrates can be installed, and at the same time, a pair of assembly substrates can be folded and flipped relative to each other.

[0017] The knurled rotating shaft includes a smooth part and a knurled part. The knurled part is in interference connection with the connecting sleeve, that is, the knurled part is fixedly connected with one of the connecting sleeves in an interference manner, and the other connecting sleeve can rotate around the smooth part, so as to realize the mutual folding and flipping of a pair of assembly substrates.

[0018] In one or more embodiments of the present invention, the diameter dimension range of the knurled rotating shaft is 1-2 mm. The smooth part is a smooth surface. The surface of the knurled part is provided with vertical lines or threads. The diameter of the knurled part is larger than that of the smooth part. When the smooth part is inserted into the connecting sleeve, the smooth part can be smoothly inserted, and the knurled part can be embedded in the connecting sleeve in an interference fit manner, so that a pair of assembly substrates are not easily separated.

[0019] In one or more embodiments of the present invention, the depth range of the first assembly groove is 0.4-1 mm. The first liquid crystal writing film is installed in the first assembly groove by means of back gluing or edge gluing. When the first liquid crystal writing film is installed in the first assembly groove, the first liquid crystal writing film is lower than the plane of the assembly substrate. When the assembly substrate is placed upside down on the tabletop, the frame of the assembly substrate can protect the first liquid crystal writing film, so that the first liquid crystal writing film is not scratched by small foreign objects.

[0020] In one or more embodiments of the present utility model, the control circuit board is installed in the first assembly groove by screws. A Hall switch is installed on the control circuit board. Through the mutual cooperation between the Hall switch and the magnet, the Hall effect can be generated, and then the handwriting on the first liquid crystal writing film can be erased.

[0021] In one or more embodiments of the present utility model, both the first sticker and the second sticker are made of single-sided adhesive PVC materials. The area of the second sticker is larger than the area of the control circuit board and is used to cover the control circuit board, mainly for aesthetics and protecting the screen pins.

[0022] In one or more embodiments of the present utility model, a connecting portion is connected to the writing pen. A clamping groove matching the connecting portion is provided on the side wall of the assembly substrate. By clamping the connecting portion in the clamping groove, the writing pen can be fixed on the side wall of the assembly substrate.

[0023] In one or more embodiments of the present utility model, a second assembly groove is provided on the outer side surface of the assembly substrate. A second liquid crystal writing film is provided in the second assembly groove. The second liquid crystal writing film can also be used for users to write, and thus the overall writing capacity of the assembly substrate can be improved;

[0024] A plurality of second pins are connected to the second liquid crystal writing film. A second copper mesh is connected to the second pins. A key and a plurality of second pads are installed on the control circuit board. The second copper mesh is electrically connected to the second pads. Through the mutual cooperation between the second copper mesh and the second pads, it is convenient for users to write on the second liquid crystal writing film, and at the same time, the handwriting on the second liquid crystal writing film can be erased by using the key.

[0025] Compared with the prior art, a multi-screen folding liquid crystal writing board of the present utility model can reduce the border of the liquid crystal screen of the writing board and increase the proportion of the liquid crystal screen, and thus can improve the user experience. At the same time, multiple liquid crystal screens can be added to increase the writing capacity of the writing board, so as to meet the user's usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of the unfolded inner side surface of a multi-screen folding liquid crystal writing board in an embodiment of the present utility model;

[0028] Figure 2 For Figure 1 Schematic diagram of the structure at position A in

[0029] Figure 3 Schematic diagram of the knurled rotating shaft structure in an embodiment of the present utility model;

[0030] Figure 4 Schematic diagram of the unfolded outer side structure of a multi-screen folding liquid crystal writing board in an embodiment of the present utility model;

[0031] Figure 5 Schematic diagram of the inner side structure of the assembly substrate in an embodiment of the present utility model;

[0032] Figure 6 Schematic diagram of the outer side structure of the assembly substrate in an embodiment of the present utility model;

[0033] Figure 7 Schematic diagram of the first liquid crystal writing film structure in an embodiment of the present utility model;

[0034] Figure 8 Schematic diagram of the control circuit board structure in an embodiment of the present utility model;

[0035] Figure 9 Schematic diagram of the first surface sticker structure in an embodiment of the present utility model;

[0036] Figure 10 Schematic diagram of the second surface sticker structure in an embodiment of the present utility model;

[0037] Figure 11 Schematic diagram of the writing pen structure in an embodiment of the present utility model;

[0038] Figure 12 Top view of the writing pen in an embodiment of the present utility model;

[0039] Figure 13 Schematic diagram of the second liquid crystal writing film structure in an embodiment of the present utility model.

[0040] Main reference numeral description:

[0041] 1 - Assembly substrate, 101 - Connecting sleeve, 102 - Knurled rotating shaft, 1021 - Smooth part, 1022 - Pattern part, 103 - First assembly groove, 104 - Installation groove, 105 - Perforation, 2 - First liquid crystal writing film, 201 - First copper mesh, 3 - Control circuit board, 301 - First pad, 302 - Second pad, 4 - First surface sticker, 5 - Second surface sticker, 6 - Writing pen, 601 - Connecting part, 602 - Magnet, 7 - Second liquid crystal writing film, 701 - Second copper mesh. Detailed implementation manners

[0042] To enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0043] Embodiment 1

[0044] As Figures 1 to 12 shown, a multi-screen folding liquid crystal writing board in an embodiment of the present utility model includes a pair of assembly substrates 1, a pair of first liquid crystal writing films 2, a pair of control circuit boards 3, a pair of first surface stickers 4, a pair of second surface stickers 5, and a writing pen 6.

[0045] Among them, a hinge mechanism is connected between the pair of assembly substrates 1, and the pair of assembly substrates 1 can be folded and flipped by using the hinge mechanism so that the user can write on the first liquid crystal writing film 2.

[0046] Specifically, the hinge mechanism includes two pairs of connecting sleeves 101. Each pair of connecting sleeves 101 is installed in a staggered manner. The connecting sleeve 101 is cylindrical and integrally formed with the assembly substrate 1. The connecting sleeve 101 is installed on the side surfaces of the pair of assembly substrates 1 close to each other, and the two pairs of connecting sleeves 101 are respectively arranged at the upper and lower edge positions of the assembly substrate 1, that is Figures 1 to 2 the positions shown.

[0047] The two pairs of connecting sleeves 101 on the assembly substrate 1 can intersect and engage. As Figure 2 shown, the upper connecting sleeve 101 is provided with a through-hole, and the lower connecting sleeve 101 is provided with a semi-through-hole. When a pair of connecting sleeves 101 are engaged with each other, the diameters of the holes on the upper and lower connecting sleeves 101 are on the same straight line. The smooth part 1021 can be inserted from one side of the through-hole, and the pattern part 1022 is press-fitted and embedded into the hole of the upper connecting sleeve 101, so that the pair of assembly substrates 1 are not easily separated, and thus the pair of assembly substrates 1 can be folded and flipped.

[0048] Optionally, both the assembly substrate 1 and the connecting sleeve 101 are injection-molded from ABS material or HIPS material. Preferably, the assembly substrate 1 and the connecting sleeve 101 are made of ABS material.

[0049] As Figures 1 to 12As shown, a knurled rotating shaft 102 is connected between a pair of connecting sleeves 101. The knurled rotating shaft 102 is made of stainless steel, and the diameter size range of the knurled rotating shaft 102 is 1 - 2 mm. Through the mutual cooperation of the pair of connecting sleeves 101 and the knurled rotating shaft 102, a pair of assembly substrates 1 can be installed, and thus the pair of assembly substrates 1 can be folded and flipped relative to each other, which is convenient for users to use.

[0050] Among them, the knurled rotating shaft 102 includes a smooth portion 1021 and a knurled portion 1022. The knurled portion 1022 is in interference connection with the upper connecting sleeve 101, that is, the knurled portion 1022 is fixedly connected with the upper connecting sleeve 101 by interference fit. The lower connecting sleeve 101 can rotate around the smooth portion 1021, and thus the pair of assembly substrates 1 can be folded and flipped relative to each other.

[0051] In addition, the smooth portion 1021 is a smooth surface, the surface of the knurled portion 1022 is provided with vertical lines or threads, and the diameter of the knurled portion 1022 is about 0.1 - 0.2 mm larger than the diameter of the smooth portion 1021. When the smooth portion 1021 is inserted into the lower connecting sleeve 101, the smooth portion 1021 can be smoothly inserted, and the knurled portion 1022 can be embedded in the upper connecting sleeve 101 in an interference fit manner, so that the pair of assembly substrates 1 are not easily separated.

[0052] As Figures 1 to 12 shown, a first assembly groove 103 is provided on the inner side surface of the assembly substrate 1, and the first assembly groove 103 is used for assembling the first liquid crystal writing film 2.

[0053] Among them, the depth range of the first assembly groove 103 is 0.4 - 1 mm. In this application, the depth of the first assembly groove 103 is 0.8 mm. The first liquid crystal writing film 2 is installed in the first assembly groove 103 by means of adhesive on the back or edge gluing. When the first liquid crystal writing film 2 is installed in the first assembly groove 103, the first liquid crystal writing film 2 is lower than the plane of the frame of the assembly substrate 1, so that when the assembly substrate 1 is placed upside down on the tabletop, the frame of the assembly substrate 1 can protect the first liquid crystal writing film 2 and prevent the first liquid crystal writing film 2 from being scratched by small foreign objects.

[0054] In addition, the length and width of the first assembly groove 103 are generally about 0.3 mm larger than the length and width of the first liquid crystal writing film 2, and the width of the frame of the assembly substrate 1 is generally 0.8 - 1.5 mm, which is 1.2 mm in this application.

[0055] Specifically, an installation groove 104 is provided on the outer side of the assembly substrate 1. The installation groove 104 is provided on the side of the assembly substrate 1 close to the control circuit board 3, and the installation groove 104 is on the same side as the through hole 105. The installation groove 104 is used for installing the control circuit board 3. A plurality of through holes 105 are provided through the assembly substrate 1. The through holes 105 can be two adjacent small through holes or a large through hole that penetrates. The first assembly groove 103 is communicated with the installation groove 104 through the through hole 105. The first copper mesh 201 of the first pin on the first liquid crystal writing film 2 can be connected to the first pad 301 through the through hole 105.

[0056] As Figures 1 to 12 shown, a pair of first liquid crystal writing films 2 are respectively installed in a pair of first assembly grooves 103. A plurality of first pins are connected to the first liquid crystal writing film 2, and a first copper mesh 201 is connected to the first pins. The first copper mesh 201 passes through the through hole 105. The first copper mesh 201 passing through the through hole 105 can be connected to the first pad 301.

[0057] As Figures 1 to 12 shown, a pair of control circuit boards 3 are respectively installed in a pair of installation grooves 104. The control circuit board 3 is installed in the first assembly groove 103 by screws. The control circuit board 3 provides drive for clearing the handwriting on the first liquid crystal writing film 2.

[0058] Among them, a plurality of first pads 301 are provided on the control circuit board 3, and the first pads 301 are electrically connected to the first copper mesh 201.

[0059] In addition, a Hall switch is installed on the control circuit board 3. By the mutual cooperation of the Hall switch and the magnet 602, the Hall effect can be generated, and then the handwriting on the first liquid crystal writing film 2 can be removed.

[0060] As Figures 1 to 12 shown, the first surface sticker 4 covers the first pins, and the second surface sticker 5 covers the control circuit board 3. Both the first surface sticker 4 and the second surface sticker 5 are made of single-sided adhesive PVC materials. The first surface sticker 4 is used to block the first pins, thereby ensuring aesthetics. The area of the second surface sticker 5 is larger than the area of the control circuit board 3. The second surface sticker 5 is used to cover the control circuit board 3, mainly playing the roles of aesthetics and protecting the screen pins.

[0061] As Figures 1 to 12 shown, the stylus 6 is installed on the side wall of the assembly substrate 1. The stylus 6 is used for writing on the first liquid crystal writing film 2.

[0062] Among them, a connecting portion 601 is connected to the stylus 6, and a clamping groove matching the connecting portion 601 is provided on the side wall of the assembly substrate 1. By clamping the connecting portion 601 in the clamping groove, the stylus 6 can be fixed on the side wall of the assembly substrate 1.

[0063] In addition, the top of the stylus 6 is provided with a hole groove, and a magnet 602 is installed in the hole groove. The magnet 602 can be assembled in the hole groove of the stylus 6 by structural tolerance fit or by using glue bonding. When the magnet 602 approaches the Hall switch on the control circuit board 3, the Hall switch is turned on under the action of the magnetic field, and the screen clearing circuit of the control circuit board 3 is conducted, thereby clearing the handwriting on the first liquid crystal writing film 2.

[0064] To simplify the assembly process, the magnet 602 can be cylindrical or strip-shaped with a square end face. In this application, the magnet 602 is cylindrical. The stylus 6 is injection-molded from POM material.

[0065] Embodiment 2

[0066] As Figures 1 to 13 shown, a second assembly groove is provided on the outer side of the left assembly substrate 1, and a second liquid crystal writing film 7 is installed in the second assembly groove. A second lead is connected to the second liquid crystal writing film 7, and a second copper mesh 701 is installed on the second lead.

[0067] The left control circuit board 3 is provided with a button and a second pad 302, and the second copper mesh 701 is electrically connected to the second pad 302. By pressing the button, the switch on the control circuit board 3 can be turned on to clear the screen of the second liquid crystal writing film 7 on the left. The first liquid crystal writing film 2 uses Hall switch magnetic induction control to clear the screen, and the second liquid crystal writing film 7 uses button control to clear the screen. This not only reduces the volume of the control circuit board 3 but also makes the screen clearing of the first liquid crystal writing film 2 and the second liquid crystal writing film 7 non-interfering with each other.

[0068] At this time, in this embodiment, there are two first liquid crystal writing films 2 and one second liquid crystal writing film 7, for a total of 3 screens.

[0069] The others are the same as in Embodiment 1.

[0070] Embodiment 3

[0071] As Figures 1 to 13 shown, a second assembly groove is also provided on the outer side of the right assembly substrate 1, and a second liquid crystal writing film 7 is installed in the second assembly groove. A second lead is connected to the second liquid crystal writing film 7, and a second copper mesh 701 is installed on the second lead.

[0072] The right control circuit board 3 is also provided with a button and a second pad 302, and the second copper mesh 701 is electrically connected to the second pad 302. By pressing the button, the switch on the control circuit board 3 can be turned on to clear the screen of the second liquid crystal writing film 7 on the right. The first liquid crystal writing film 2 uses Hall switch magnetic induction control to clear the screen, and the second liquid crystal writing film 7 uses button control to clear the screen. This not only reduces the volume of the control circuit board 3 but also makes the screen clearing of the first liquid crystal writing film 2 and the second liquid crystal writing film 7 non-interfering with each other.

[0073] At this time, in this embodiment, there are two first liquid crystal writing films 2 and two second liquid crystal writing films 7, totaling 4 screens.

[0074] Others are the same as in Embodiment 2.

[0075] During specific use, as Figures 1 to 13 shown, a control circuit board 3 with a Hall switch and keys is assembled in the installation groove 104 on the assembly substrate 1. The control circuit board 3 is connected to the assembly substrate 1 by screws. The second liquid crystal writing film 7 is attached to the outer side surface of the left assembly substrate 1, and the second copper mesh 701 on the second liquid crystal writing film 7 is connected to the second pad 302. The first liquid crystal writing film 2 is attached to the inner side surface of the left assembly substrate 1, and the first copper mesh 201 on the first liquid crystal writing film 2 passes through the through hole 105 and is connected to the first pad 301.

[0076] Repeat the above steps on the right assembly substrate 1 to attach the first liquid crystal writing film 2 and the second liquid crystal writing film 7 respectively.

[0077] Close a pair of assembly substrates 1, align the hole positions between a pair of connecting sleeves 101, and insert the knurled rotating shaft 102 between a pair of connecting sleeves 101. A cylindrical or strip-shaped magnet 602 is assembled on the top of the writing pen 6 by dispensing.

[0078] Attach the first sticker 4 and the second sticker 5 to the inner and outer sides of the assembly substrate 1 respectively, and the second sticker 5 is attached to the surface of the control circuit board 3.

[0079] When writing, the first liquid crystal writing film 2 or the second liquid crystal writing film 7 is subjected to corresponding pressure, reflects natural light, and display is realized at the corresponding position. When it is necessary to clear the handwriting on the first liquid crystal writing film 2, unfold a pair of assembly substrates 1, and use the magnet 602 on the top of the writing pen 6 to approach the Hall switch on the control circuit board 3 for the left and right parts on the inner side of the assembly substrate 1. The Hall element on the detection surface of the Hall switch causes the internal circuit state of the Hall switch to change due to the Hall effect, thereby controlling the Hall switch to conduct and the circuit to be energized. The liquid crystal molecules in the first liquid crystal writing film 2 deflect under the condition of being energized and return to the previous arrangement mode, and the handwriting is cleared.

[0080] When it is necessary to clear the handwriting on the second liquid crystal writing film 7, close a pair of assembly substrates 1, and the pair of second liquid crystal writing films 7 realize switch conduction through the key to clear the screen of the second liquid crystal writing film 7. That is, the second liquid crystal writing film 7 on the outer side of the assembly substrate 1 is cleared by key control, and the first liquid crystal writing film 2 on the inner side of the assembly substrate 1 is cleared by Hall induction, which can effectively reduce the crosstalk of the clear screen signal and improve the user experience.

[0081] Under the same product size, this application can achieve a writing capacity about 2-4 times that of traditional liquid crystal writing tablets, saving social resources. The control circuit board 3 can use Hall switch magnetic induction screen clearing and button dual screen clearing, which improves the user experience and saves assembly space.

[0082] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be construed as limiting the claimed rights.

[0083] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-screen foldable liquid crystal writing board, characterized in that, Including: A pair of assembly substrates, an articulated mechanism is connected between the pair of assembly substrates. The inner side surface of the assembly substrate is provided with a first assembly groove, the outer side surface of the assembly substrate is provided with a mounting groove, and a plurality of through holes are provided through the assembly substrate. The first assembly groove is communicated with the mounting groove through the through holes; A pair of first liquid crystal writing films are respectively installed in the pair of first assembly grooves. A plurality of first pins are connected to the first liquid crystal writing film, and a first copper mesh is connected to the first pins. The first copper mesh passes through the through holes; A pair of control circuit boards are respectively installed in the pair of mounting grooves. A plurality of first pads are provided on the control circuit board, and the first pads are electrically connected to the first copper mesh; A pair of first stickers and a pair of second stickers, the first stickers cover the first pins, and the second stickers cover the control circuit board; A writing pen is installed on the side wall of the assembly substrate, and a magnet is installed on the top of the writing pen.

2. The multi-screen folding liquid crystal writing board according to claim 1, wherein, The articulated mechanism includes two pairs of connecting sleeves. Each pair of connecting sleeves is installed in a staggered manner and is integrally formed with the assembly substrate.

3. The multi-screen folding liquid crystal writing board according to claim 2, wherein, The assembly substrate and the connecting sleeves are both injection-molded from ABS material or HIPS material.

4. The multi-screen folding liquid crystal writing board according to claim 2, characterized in that, A knurled rotating shaft is connected between the pair of connecting sleeves. The knurled rotating shaft includes a smooth part and a knurled part, and the knurled part is in interference connection with the connecting sleeve.

5. The multi-screen folding liquid crystal writing board according to claim 4, wherein The diameter size range of the knurled rotating shaft is 1-2 mm. The smooth part is a smooth surface, the surface of the knurled part is provided with vertical lines or threads, and the diameter of the knurled part is larger than the diameter of the smooth part.

6. The multi-screen foldable liquid crystal writing board according to claim 1, characterized in that, The depth range of the first assembly groove is 0.4-1 mm, and the first liquid crystal writing film is installed in the first assembly groove by means of adhesive on the back or edge gluing.

7. A multi-screen foldable liquid crystal writing board according to claim 1, characterized in that, The control circuit board is installed in the first assembly groove by screws, and a Hall switch is installed on the control circuit board.

8. The multi-screen folding liquid crystal writing board according to claim 1, characterized in that, The first stickers and the second stickers are both made of single-sided adhesive PVC material, and the area of the second sticker is larger than the area of the control circuit board.

9. The multi-screen folding liquid crystal writing board according to claim 1, wherein A connecting part is connected to the writing pen, and a clamping groove matching the connecting part is provided on the side wall of the assembly substrate.

10. The multi-screen folding liquid crystal writing board according to claim 1, wherein A second assembly groove is provided on the outer side surface of the assembly substrate. A second liquid crystal writing film is provided in the second assembly groove. A plurality of second pins are connected to the second liquid crystal writing film, and a second copper mesh is connected to the second pins. A key and a plurality of second pads are installed on the control circuit board, and the second copper mesh is electrically connected to the second pads.

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