Anti-bubble liquid crystal writing film and writing board
By setting an adhesion layer or magnetic suction layer in the liquid crystal writing film, the expansion of the base layer in the parallel direction is ensured to be consistent, and the bubble problem in high-temperature and high-humidity environments is solved, improving the writing effect and simplifying the maintenance process.
Patent Information
- Application Number
- CN202421842494.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing liquid crystal writing films are under high temperature and high humidity or strong light, due to the inconsistent expansion of the base layer, resulting in the generation of bubbles, affecting the writing effect and user experience.
The adhesion layer or magnetic suction layer is used to connect to the second base layer so that the expansion coefficient of the base layer is consistent in the direction parallel to the writing plane, and is connected to the substrate through vacuum adsorption or magnetic suction, and force is applied only in the vertical direction to avoid the formation of voids.
It effectively avoids the generation of bubbles, improves the writing effect, and facilitates the disassembly and assembly and replacement of the LCD writing film, reducing maintenance costs.
Smart Images
Figure CN223139973U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid crystal writing, in particular to an anti-bubble liquid crystal writing film and a writing board. Background Technique
[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.
[0003] Liquid crystal writing devices have been widely used in many fields such as education and office, and have very good development prospects.
[0004] In the prior art, a liquid crystal writing device is composed of a liquid crystal writing film and a substrate. The liquid crystal writing film includes a first base layer, a bistable liquid crystal layer, and a second base layer arranged in sequence from top to bottom; conductive layers are respectively provided on the opposite sides of the first base layer and the second base layer; among them, both the first base layer and the second base layer are made of soft film materials (such as PET film), and the second base layer is often fixed on the substrate by pasting.
[0005] The above structure will face the following technical problems in the actual use process:
[0006] Due to the nature of the film material itself, when the liquid crystal writing film is strongly irradiated by sunlight or in a high-temperature and high-humidity environment, the film materials of the first base layer and the second base layer will expand in the direction parallel to the writing plane due to heat; however, since the second base layer is pasted to the substrate, the expansion of the second base layer will be restricted by the substrate, that is, the expansion coefficients of the film materials of the first base layer and the second base layer are inconsistent, so that the expansion degree of the first base layer is greater than that of the second base layer, thus forming a gap between the liquid crystal layer and the first base layer. When the writing film surface is subjected to writing pressure, the liquid crystal will gather around the liquid crystal to form a sphere under the action of surface tension, and the writing pressure position will become a vacuum, resulting in the formation of vacuum bubbles at the writing trace position. On the other hand, the moisture and dissolved gases in the liquid crystal layer, the gases generated by the decomposition of organic substances, and the volatile gases of organic substances will also diffuse out due to the existence of the gap, thus forming bubbles at the original position, affecting the writing effect and the use experience. Summary of the Utility Model
[0007] In order to solve the above problems, the utility model proposes an anti-bubble liquid crystal writing film and a writing board, which change the fixed connection mode between the second base layer and the substrate, so that the expansion coefficients of the upper and lower base layers in the direction parallel to the writing plane are kept consistent, thereby avoiding the generation of bubbles.
[0008] In some embodiments, the following technical solutions are adopted:
[0009] An anti-bubble liquid crystal writing film, comprising: a first base layer, a first conductive layer, a bistable liquid crystal layer, a second conductive layer, a second base layer, and an attachment layer sequentially arranged from top to bottom; the attachment layer has the same expansion coefficient as the second base layer, or the deviation between the two expansion coefficients is within a set range.
[0010] Further, the attachment layer is a soft rubber. Or, the attachment layer is a magnetic attraction layer. The expansion coefficient of the attachment layer material is the same as that of the second base layer, or the difference between the two is within [-5×10 -6 / °C, +5×10 -6 / °C].
[0011] In some other embodiments, the following technical solution is adopted:
[0012] An anti-bubble liquid crystal writing film, comprising: a first base layer, a first conductive layer, a bistable liquid crystal layer, a second conductive layer, and a second base layer sequentially arranged from top to bottom, wherein a magnetic material is provided on the surface of the second base layer away from the second conductive layer.
[0013] The magnetic material is magnetic powder laid on the second base layer; the magnetic powder is laid on the entire plane of the second base layer, or the magnetic powder is laid on the plane of the second base layer according to a set arrangement rule.
[0014] In some other embodiments, the following technical solution is adopted:
[0015] A writing board, comprising the above various anti-bubble liquid crystal writing films and a substrate, and the liquid crystal writing film is connected to the substrate by adsorption; or, the substrate is an iron-containing metal substrate, and the liquid crystal writing film is adsorbed onto the iron-containing metal substrate by magnetic attraction.
[0016] Compared with the prior art, the beneficial effects of the present utility model are:
[0017] (1) The present utility model provides an attachment layer on the liquid crystal writing film, and the attachment layer can be a soft rubber or a magnetic attraction layer; since the expansion coefficients of the second base layer and the attachment layer are the same or close, the attachment layer does not limit the expansion and contraction (expansion or contraction) of the second base layer in the direction parallel to the writing plane, so the expansion coefficients of the first base layer and the second base layer are basically the same;
[0018] In addition, the second base layer of the liquid crystal writing film of the present utility model is connected to the substrate by vacuum adsorption or magnetic attraction, and only applies force in the direction perpendicular to the writing plane, so it will not affect or limit the expansion or contraction of the second base layer in the direction parallel to the writing plane;
[0019] Therefore, when the liquid crystal writing film is strongly irradiated by sunlight or in a high-temperature and high-humidity environment, the expansion degrees of the first base layer and the second base layer are basically the same, and no gap is formed between the liquid crystal layer and the first base layer, thus avoiding the problem of generating bubbles during writing.
[0020] (2) The liquid crystal writing film of the present utility model is connected to the iron-containing metal substrate by means of magnetic attraction or vacuum adsorption, which can make the disassembly and assembly of the liquid crystal writing film convenient; when the product needs to be repaired or replaced, there is no need to replace the substrate, only the liquid crystal writing film needs to be replaced, which is convenient for transportation, and the replacement process is relatively simple, and the professional requirements for operators are not high. It is especially suitable for application in large blackboards, greatly reducing the after-sales maintenance cost.
[0021] Other features and advantages of the additional aspects of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of this aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic structural diagram of the anti-bubble liquid crystal writing film in Embodiment 1 of the present utility model;
[0023] Figure 2 It is a schematic diagram of a layout method of the magnetic attraction layer on the second base layer in Embodiment 1 of the present utility model;
[0024] Figs. 3(a)-(c) are respectively schematic layout diagrams of another layout method of the magnetic attraction layer on the second base layer in Embodiment 1 of the present utility model;
[0025] Figure 4 It is a schematic structural diagram of the anti-bubble liquid crystal writing film in Embodiment 2 of the present utility model;
[0026] Among them, 1. First base layer, 2. First conductive layer, 3. Bistable liquid crystal layer, 4. Second conductive layer, 5. Second base layer, 6. Magnetic attraction layer, 7. Magnetic attraction block, 8. Magnetic powder. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present application. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.
[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0029] It should be noted that the expansion coefficient is used to describe the change in length or volume of an object when the temperature changes, that is, the relative change in the length or volume of the object per unit temperature change.
[0030] In this embodiment, the PET film, the magnetic attraction layer, the substrate, etc. involved all have their respective expansion coefficients; materials with suitable expansion coefficients can be selected according to needs.
[0031] The metals with magnetic attraction function are iron, cobalt, and nickel. Since cobalt and nickel are relatively expensive, the metal substrate in this embodiment generally uses iron metal, including iron substrates and iron-containing alloys, hereinafter collectively referred to as iron-containing metal substrates.
[0032] It should be further noted that the expansion of the PET film, the magnetic attraction layer, the substrate, etc. in this embodiment refers to the expansion in the length and width directions.
[0033] Embodiment 1
[0034] In one or more embodiments, an anti-bubble liquid crystal writing film is disclosed, which Figure 1 , specifically includes: a first base layer, a first conductive layer, a bistable liquid crystal layer, a second conductive layer, a second base layer, and a soft rubber layer attached to the second base layer, which are sequentially arranged from top to bottom; the soft rubber layer has the same or similar expansion coefficient as the second base layer, where similar means that the difference between the expansion coefficient of the magnetic attraction layer material and the expansion coefficient of the second base layer is controlled within the range of [-5×10 -6 / °C, +5×10 -6 / °C].
[0035] In this embodiment, both the first base layer and the second base layer are made of soft film materials, and the first conductive layer and the second conductive layer are respectively arranged on two opposite surfaces of the first base layer and the second base layer; optionally, both the first base layer and the second base layer can be made of PET film, and their expansion coefficients are the same; the first conductive layer and the second conductive layer can be made of ITO conductive film.
[0036] In this embodiment, one side of the soft rubber layer is coated with glue for bonding with the second base layer, and the other side of the soft rubber layer can adsorb to the substrate, for example: vacuum adsorption or magnetic attraction can be used.
[0037] In this way, when the liquid crystal writing film is in a high-temperature and high-humidity environment, the soft rubber layer will not restrict the expansion of the second base layer; in addition, since the vacuum adsorption or magnetic adsorption method only applies force in the direction perpendicular to the writing plane, it will not affect or restrict the expansion or contraction of the second base layer in the direction parallel to the writing plane; therefore, the expansion degrees of the first base layer, the second base layer, and the soft rubber layer are basically the same, avoiding the generation of voids between the liquid crystal layer and the first base layer in a high-temperature and high-humidity environment, and thus being able to avoid the generation of bubbles.
[0038] Embodiment 2
[0039] In one or more embodiments, an anti-bubble liquid crystal writing film is disclosed, which combines Figure 1 , and specifically includes: a first base layer 1, a first conductive layer 2, a bistable liquid crystal layer 3, a second conductive layer 4, a second base layer 5, and a magnetic adsorption layer 6 arranged in sequence from top to bottom; wherein, the second base layer and the magnetic adsorption layer are connected by pasting; the expansion coefficient of the magnetic adsorption layer material is the same as or close to that of the second base layer, and being close means that the difference between the expansion coefficient of the magnetic adsorption layer material and that of the second base layer is controlled within the range of [-5×10 -6 / °C, +5×10 -6 / °C].
[0040] In this embodiment, both the first base layer and the second base layer are made of soft film materials, and the first conductive layer and the second conductive layer are respectively arranged on two opposite surfaces of the first base layer and the second base layer; optionally, both the first base layer and the second base layer can adopt PET films, and their expansion coefficients are the same; the first conductive layer and the second conductive layer can adopt ITO conductive films.
[0041] In this embodiment, one side of the magnetic adsorption layer is coated with glue for bonding with the second base layer, and the other side has magnetism and can adsorb to an iron-containing metal substrate. As a specific example, the magnetic adsorption layer of this embodiment can adopt a soft magnetic sheet or magnetic rubber, and their expansion coefficients are usually in the range of 15×10 -6 / °C to 25×10 -6 / °C.
[0042] One side of the second base layer away from the conductive layer is fixed to the magnetic adsorption layer by pasting. The second base layer is a PET film, and its expansion coefficient is usually also in the range of 15×10 -6 / °C to 25×10 -6Within the range of / ℃, the expansion coefficients of the magnetic attraction layer and the second base layer are selected to be the same or similar. In this way, when the liquid crystal writing film is in a high-temperature and high-humidity environment, the magnetic attraction layer will not restrict the expansion of the second base layer. In addition, the second base layer is connected to the iron-containing metal substrate by magnetic attraction. Since the magnetic attraction only applies force in the direction perpendicular to the writing plane, it will not affect or restrict the expansion or contraction of the second base layer in the direction parallel to the writing plane. Therefore, the expansion degrees of the first base layer, the second base layer, and the magnetic attraction layer are basically the same, avoiding the generation of voids between the liquid crystal layer and the first base layer in a high-temperature and high-humidity environment, and thus being able to avoid the generation of bubbles.
[0043] As an implementation manner, the magnetic attraction layer can cover the entire plane of the second base layer, so that the second base layer can be magnetically adsorbed and connected to the iron-containing metal substrate through the magnetic attraction layer. As another implementation manner, the magnetic attraction layer can also be arranged as a plurality of magnetic attraction blocks 7 composed of soft magnetic sheets or magnetic rubbers, and these magnetic blocks are arranged on the second base layer according to a set arrangement rule. For example: the magnetic blocks can be arranged on the second base layer in an array manner, as Figure 2 shown; the magnetic blocks can also be arranged on the second base layer in a diagonal cross, cross cross, or star cross manner, as shown in Figures 3(a)-(c); the magnetic blocks can also be arranged only in the middle and edges of the second base layer, etc. Those skilled in the art can select according to actual needs as long as it can ensure that the second base layer can be firmly adsorbed on the iron-containing metal substrate.
[0044] The anti-bubble liquid crystal writing film of this embodiment can be quickly connected to the iron-containing metal substrate and is convenient for disassembly and assembly; when the product needs to be repaired or replaced, there is no need to replace the substrate, only the liquid crystal writing film needs to be replaced, which is convenient for transportation, and the replacement process is relatively simple, and the professional requirements for operators are not high. It is especially suitable for application in large blackboards, greatly reducing the after-sales maintenance cost.
[0045] Embodiment Three
[0046] In one or more implementation manners, an anti-bubble liquid crystal writing film is disclosed, in combination with Figure 4 , specifically including: a first base layer, a first conductive layer, a bistable liquid crystal layer, a second conductive layer, and a second base layer arranged in sequence from top to bottom. Among them, a magnetic material is provided on the surface of the second base layer away from the second conductive layer.
[0047] In this embodiment, instead of separately providing a magnetic attraction layer, a magnetic material, such as magnetic powder 8, is provided on the side of the second base layer that contacts the iron-containing metal substrate. In this way, the second base layer can also be connected to the iron-containing metal substrate by magnetic attraction. Since the magnetic attraction method only applies force in the direction perpendicular to the writing plane, it will not affect or limit the expansion or contraction of the second base layer in the direction parallel to the writing plane; therefore, in a high-temperature and high-humidity environment, the expansion degrees of the first base layer and the second base layer are the same, thus avoiding the generation of bubbles.
[0048] It should be noted that the magnetic powder can be provided to cover the entire plane of the second base layer, or the magnetic powder can be provided at the set positions of the second base layer with reference to the setting method of the magnetic attraction blocks in the first embodiment, so as to ensure that the second base layer can be firmly adsorbed to the iron-containing metal substrate.
[0049] The anti-bubble liquid crystal writing film of this embodiment also has the characteristics of being easy to disassemble and replace.
[0050] It should be noted that for the anti-bubble liquid crystal writing films in the first embodiment and the second embodiment, their first conductive layer and second conductive layer can both be undivided, which is applicable to a liquid crystal writing device with one-key erasing; the first conductive layer and the second conductive layer can also be respectively divided into a plurality of mutually parallel and insulated conductive regions, which is applicable to a liquid crystal writing device with local erasing.
[0051] Embodiment 4
[0052] In one or more embodiments, a writing board is disclosed, including: the anti-bubble liquid crystal writing film in the first embodiment and a substrate, and the liquid crystal writing film is adsorbed to the iron-containing metal substrate by vacuum adsorption or magnetic attraction.
[0053] Embodiment 5
[0054] In one or more embodiments, a writing board is disclosed, including: the anti-bubble liquid crystal writing film in the second embodiment or the third embodiment and an iron-containing metal substrate, and the liquid crystal writing film is adsorbed to the iron-containing metal substrate by magnetic attraction. The iron-containing substrate can be an iron substrate or an iron alloy, which has a low cost and good magnetic attraction performance.
[0055] It should be noted that the writing board of this embodiment can be used for writing or drawing, etc., including a blackboard, a writing board or a drawing board, etc.
[0056] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.
Claims
1. An anti-bubble liquid crystal writing film, characterized in that, Comprising: A first base layer, a first conductive layer, a bistable liquid crystal layer, a second conductive layer, a second base layer, and an attachment layer attached to the second base layer, which are sequentially arranged from top to bottom; the attachment layer has the same coefficient of thermal expansion as the second base layer, or the deviation of the coefficients of thermal expansion between the two is within a set range.
2. The anti-bubble liquid crystal writing film according to claim 1, wherein The attachment layer is a soft rubber.
3. The anti-bubble liquid crystal writing film according to claim 1, characterized in that, The attachment layer is a magnetic attraction layer, and the second base layer and the magnetic attraction layer are connected by pasting.
4. The anti-bubble liquid crystal writing film according to claim 2 or 3, characterized in that, The coefficient of thermal expansion of the adhesion layer material is the same as that of the second base layer, or the difference between the two is in the range of [-5×10 -6 / °C, +5×10 -6 / °C].
5. The anti-bubble liquid crystal writing film according to claim 3, wherein The magnetic attraction layer is a soft magnetic sheet or magnetic rubber.
6. The anti-bubble liquid crystal writing film according to claim 3, wherein The magnetic attraction layer covers the entire plane of the second base layer; Or, The magnetic attraction layer includes a plurality of magnetic blocks, and the magnetic blocks are arranged on the plane of the second base layer according to a set arrangement rule.
7. An anti-bubble liquid crystal writing film, characterized in that, Comprising: A first base layer, a first conductive layer, a bistable liquid crystal layer, a second conductive layer, and a second base layer, which are sequentially arranged from top to bottom, wherein a magnetic material is provided on a surface of the second base layer away from the second conductive layer.
8. The anti-bubble liquid crystal writing film according to claim 7, characterized in that, The magnetic material is magnetic powder laid on the second base layer; the magnetic powder is laid on the entire plane of the second base layer, or the magnetic powder is laid on the plane of the second base layer according to a set arrangement rule.
9. A writing board, characterized in that, Comprising the anti-bubble liquid crystal writing film and the substrate according to claim 2, wherein the liquid crystal writing film is connected to the substrate by adsorption.
10. A writing board according to claim 9, characterized in that, The liquid crystal writing film is connected to the substrate by magnetic attraction or vacuum adsorption.
11. A writing board, characterized in that, Comprising the anti-bubble liquid crystal writing film and the substrate according to claim 3, wherein the substrate is an iron-containing metal substrate, and the liquid crystal writing film is adsorbed onto the iron-containing metal substrate by magnetic attraction.
12. A writing board, characterized in that, Comprising the anti-bubble liquid crystal writing film and the substrate according to claim 7, wherein the substrate is an iron-containing metal substrate, and the liquid crystal writing film is adsorbed onto the iron-containing metal substrate by magnetic attraction.