Intelligent blackboard and preparation method thereof
By forming a curved convex surface with specific conditions on the writing surface of the smart blackboard glass display panel, the problem that the display panel in the existing technology is difficult to balance writing and display performance is solved, and good writing and display effects are achieved.
Patent Information
- Application Number
- CN202410264339.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-08
- Publication Date
- 2025-09-09
AI Technical Summary
Existing smart blackboard glass display panels are difficult to simultaneously meet the requirements of no slipping when writing with chalk, easy chalking, easy wiping and good display effect.
By forming several curved protrusions on the writing surface of the glass display panel, the roughness Ra is controlled to 0.5μm~1.1μm, the roughness Rz is 5μm±1.5μm, the roughness Rsm≤250μm, the haze is 30±10%, the DOI is 1±1, and the glossiness is 25±10%, and an integrated structure is formed through etching.
The chalk writing does not slip, the writing is smooth and easy to wipe, and it also has a good display effect, enhancing the touch feel and viewing angle.
Smart Images
Figure CN120612853A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of smart classrooms, and in particular to a smart blackboard and a method for preparing the same. Background Art
[0002] Blackboards are a common teaching aid in education. With the advancement of information technology, teaching blackboards are also gradually moving towards informatization and intelligence, leading to the emergence of smart blackboards. Smart blackboards, also known as interactive blackboards for smart classrooms, use capacitive touch technology to combine traditional handwriting blackboards with multimedia devices, allowing for easy switching between chalk writing and multimedia applications.
[0003] Smart blackboards typically include a glass display panel and a display control assembly. The glass display panel needs to be processed to function as both a display panel and a writing panel, fulfilling the display and writing functions of the smart blackboard. Currently, glass display panels are typically prepared by silk-screening ink on the back of the glass plate and etching the front. However, the functional requirements for glass display panels are high. On the one hand, the writing surface must be able to smoothly adhere to chalk when writing with chalk to display the handwriting. On the other hand, it must be easy to wipe the writing surface, and yet another requires a good display effect. However, current glass display panels struggle to fully address these requirements. Summary of the Invention
[0004] Based on this, the first aspect of the present application provides a smart blackboard, and its technical solution is as follows:
[0005] An intelligent blackboard comprises a glass display panel and a display control component;
[0006] The glass display panel includes a writing surface and a back surface opposite to the writing surface, and the display control component is located on one side of the back surface and is used to control the display of the glass display panel;
[0007] The writing surface has a plurality of curved protrusions and meets the following conditions:
[0008] (1) Roughness Ra is 0.5μm~1.1μm; (2) Roughness Rz is 5μm±1.5μm; (3) Roughness Rsm≤250μm; (4) Haze is 30±10%; (5) DOI is 1±1; (6) Gloss is 25±10.
[0009] The second aspect of the present application provides a method for preparing a smart blackboard, the technical solution of which is as follows:
[0010] A method for preparing a smart blackboard comprises the following steps:
[0011] A writing surface is formed on a glass plate, so that the writing surface has a plurality of curved protrusions and satisfies the following conditions: (1) roughness Ra is 0.5 μm to 1.1 μm; (2) roughness Rz is 5 μm ± 1.5 μm; (3) roughness Rsm ≤ 250 μm; (4) haze is 30 ± 10%; (5) DOI is 1 ± 1; (6) gloss is 25 ± 10; and a glass display panel is prepared;
[0012] The glass display panel and the display control assembly are assembled, and the display control assembly is located on the back side of the glass display panel opposite to the writing surface to prepare the smart blackboard.
[0013] Compared with traditional solutions, this application has the following beneficial effects:
[0014] The present application controls the shape of the protrusions on the writing surface of the glass display panel. At the same time, the roughness, haze, DOI, and glossiness are controlled to meet specific conditions. At this time, the glass display panel can not only not slip when writing with chalk, but also smoothly pick up chalk and display chalk writing. It can also effectively remove chalk powder on the glass display panel when wiped with an eraser, and the physical wiping difficulty is relatively low. In addition, the glass display panel also has a good display effect. In summary, the above-mentioned glass display panel takes into account the various performance requirements of the smart blackboard for display and writing. The display performance and writing performance of the smart blackboard of the present application are both excellent. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application and to more fully understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.
[0016] Figure 1 This is a SEM image of the writing surface of Example 1 from a top view;
[0017] Figure 2 This is a SEM image of the writing surface of Example 1 at a front viewing angle;
[0018] Figure 3 This is a SEM image of the writing surface of Example 2 from a top view;
[0019] Figure 4 This is a SEM image of the writing surface of Example 3 from a top view;
[0020] Figure 5 This is a SEM image of the writing surface of Example 4 from a top view;
[0021] Figure 6This is a SEM image of the writing surface of Example 5 from a top view;
[0022] Figure 7 This is a SEM image of the writing surface of Comparative Example 1 from a top-down perspective;
[0023] Figure 8 This is a SEM image of the writing surface of Comparative Example 2 from a top-down perspective;
[0024] Figure 9 This is a diagram showing the powder coating on the writing surface of Example 1;
[0025] Figure 10 This is a diagram showing the powder coating on the writing surface of Example 2;
[0026] Figure 11 This is a diagram showing the powder coating on the writing surface of Example 3;
[0027] Figure 12 This is a diagram showing the powder coating on the writing surface of Example 4;
[0028] Figure 13 This is a diagram showing the powder coating on the writing surface of Example 5;
[0029] Figure 14 This is a diagram showing the powder coating on the writing surface of Comparative Example 1;
[0030] Figure 15 This is a diagram showing the powder coating on the writing surface of Comparative Example 2. DETAILED DESCRIPTION
[0031] The present application will be further described in detail below with reference to specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the present application's disclosure.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.
[0033] the term
[0034] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:
[0035] In this application, unless otherwise specified, "several" or "several" refers to a number greater than or equal to 1. "Multiple," "multiple," "multiple times," and "plurality" refer to a number greater than or equal to 2, unless otherwise specified. For example, "one or more" means one or more than or equal to two.
[0036] In this application, the terms "optionally," "optional," and "optional" refer to options that are optional and may or may not be present, i.e., to the selection of either option from the two parallel options of "with" or "without." If multiple "options" appear in a technical solution, unless otherwise specified and there are no contradictions or constraints, each "option" is independent.
[0037] In this application, the terms "first," "second," "third," "fourth," etc., in the "first aspect," "second aspect," "third aspect," "fourth aspect," etc., are used for descriptive purposes only and should not be understood as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the indicated technical features. Furthermore, "first," "second," "third," "fourth," etc., are only used for non-exhaustive enumeration and description purposes, and should be understood not to constitute a closed-ended limitation on quantity.
[0038] In this application, when a first feature is “above” or “below” a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0039] In this application, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. It should also be understood that when explaining the connection relationship or positional relationship of elements, even if not explicitly described, the connection relationship and positional relationship are interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art.
[0040] In this application, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional values within the numerical interval is considered continuous and includes the two numerical endpoints of the numerical range (i.e., the minimum and maximum values), as well as every numerical value between these two numerical endpoints. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, it includes the two numerical endpoints of the numerical range, as well as every integer between the two numerical endpoints. In this document, this is equivalent to directly listing each integer. For example, "t is an integer selected from 1 to 10" means that t is any integer selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. In addition, when multiple ranges are provided to describe a feature or characteristic, these ranges may be combined. In other words, unless otherwise specified, ranges disclosed herein should be understood to include any and all subranges subsumed therein.
[0041] Unless otherwise specified, the temperature parameters in this application allow for both constant temperature treatment and temperature fluctuations within a certain temperature range. It should be understood that the constant temperature treatment allows for temperature fluctuations within the accuracy range of instrument control. Fluctuations within ranges such as ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are permitted.
[0042] In this application, when referring to percentage content, unless otherwise specified, for solid-liquid mixing and solid-solid mixing, it refers to mass percentage, and for liquid-liquid mixing, it refers to volume percentage.
[0043] In this application, references to percentage concentrations, unless otherwise specified, refer to final concentrations, which are the percentage of an added component in the system after the addition of that component.
[0044] In this application, %(w / w) and wt% both refer to weight percentage, %(v / v) refers to volume percentage, and %(w / v) refers to mass volume percentage.
[0045] A first aspect of the present application provides a smart blackboard. In one embodiment, the smart blackboard includes a glass display panel and a display control component;
[0046] The glass display panel includes a writing surface and a back surface opposite to the writing surface, and the display control component is located on one side of the back surface and is used to control the display of the glass display panel;
[0047] The writing surface has a plurality of curved protrusions and meets the following conditions:
[0048] (1) Roughness Ra is 0.5μm~1.1μm; (2) Roughness Rz is 5μm±1.5μm; (3) Roughness Rsm≤250μm; (4) Haze is 30±10%; (5) DOI is 1±1; (6) Gloss is 25±10.
[0049] It should be pointed out that in this application, roughness Ra refers to the arithmetic mean deviation of the profile, roughness Rz refers to the maximum height of the profile, and roughness Rsm refers to the average width of the profile unit. Refer to GB / T 3505-2000 "Product Geometric Technical Specifications Surface Structure Profile Method Surface Structure Terms, Definitions and Parameters". The arithmetic mean deviation of the profile Ra is defined as the arithmetic mean of the absolute value of the vertical coordinate Z (x) within a sampling length. The maximum height Rz of the profile is defined as the height of the sum of the maximum profile height Zp and the maximum profile valley depth Zv within a sampling length. The average width RSm of the profile unit is defined as the average value of the profile unit width Xs within a sampling length.
[0050] Regarding the roughness Ra, the inventors of this application have found through research that the roughness Ra is 0.5μm~1.1μm. This helps to meet the requirements of optical parameter display, and chalk writing does not stick to chalk, and the eraser can easily erase chalk marks. Optionally, the roughness Ra is 0.5μm, 0.8μm, or 1.1μm. Preferably, the roughness Ra is 0.8μm±0.3μm. When the roughness Ra is less than 0.5μm, the chalk will slip when writing, and the writing effect is very poor; when the roughness Ra is greater than 1.1μm, the display effect is affected, the flash point is high, and it is easy to cause dizziness when watching.
[0051] Regarding roughness Rz, the inventors of this application have found that a roughness Rz of 5μm ± 1.5μm helps meet optical display parameters, prevents chalk from sticking to the surface, and allows for easy erasure with an eraser. Optionally, the roughness Rz can be 3.5μm, 5μm, or 6.5μm. When the roughness Rz is less than 3.5μm, chalk writing becomes slippery, resulting in poor writing quality. When the roughness Rz is greater than 6.5μm, the display quality is affected, the flash point is high, and viewing can easily cause dizziness.
[0052] Regarding the roughness Rsm, the inventors of this application have found through research that a roughness Rsm of ≤250 μm helps meet the optical parameter display requirements, and chalk writing does not stick to chalk, and chalk writing is easy to erase with an eraser. Optionally, the roughness Rz is 50 μm, 100 μm, 150 μm, 200 μm, or 250 μm. Preferably, the roughness Rsm is 50 μm to 250 μm. Preferably, the roughness Rsm is 60 μm to 250 μm. When the roughness Rz is greater than 250 μm, the display effect is affected, the flash point is high, and it is easy to cause dizziness when viewing.
[0053] Haze refers to the percentage of scattered light that deviates from the incident light beam by more than 2.5°. In this application, the haze is 30±10%, which indicates a good optical display effect.
[0054] DOI (distinctness of image) indicates the quality of the image. In this application, a DOI of 1±1 indicates a good optical display quality.
[0055] The higher the surface gloss value, the better the appearance and the smoother the surface. In this application, the glossiness is 25±10, and the optical display effect is good.
[0056] Optionally, several of the arc-surface protrusions enclose several pits, and the equivalent diameters D of the several pits are independently 15μm~45μm. For example, the equivalent diameter D of the pit is 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, and 45μm. In this application, the pit is usually an irregular-shaped object, and the equivalent diameter of the pit refers to the diameter of a hemisphere with the same volume as the pit. After research, the inventors of this application found that when the equivalent diameter D of the pit is less than 15μm, the chalk will slip when writing, and the writing effect is very poor; when the equivalent diameter D of the pit is greater than 45μm, the display effect is affected, the flash point is high, and it is easy to cause dizziness when watching.
[0057] Optionally, the angle θ enclosed by the intersection point of the two intersecting arc-surface protrusions and the two tangent lines passing through the intersection point is 140°~160°. For example, the angle θ enclosed by the intersection point of the two intersecting arc-surface protrusions and the two tangent lines passing through the intersection point is 140°, 150°, or 160°. It should be noted that the tangent lines passing through the intersection point extend from the intersection point in two directions, one of which is a direction close to the vertex of the arc surface, and the other is a direction away from the vertex of the arc surface. In the present application, the angle enclosed by two tangent lines refers to the angle enclosed by the tangent lines from the intersection point to the directions close to the vertex of each arc surface.
[0058] Optionally, to meet display brightness requirements, the visible light transmittance of the glass display panel is ≥88%. For example, the visible light transmittance of the glass plate is 88%, 90%, 95%, or 99%.
[0059] Optionally, the glass plate has a thickness of 2 mm to 4 mm.
[0060] The above embodiment controls the shape of the protrusions on the writing surface of the glass display panel. At the same time, the roughness, haze, DOI, and glossiness are controlled to meet specific conditions. At this time, the glass display panel can not only not slip when writing with chalk, but also smoothly pick up chalk and display chalk writing. It can also effectively remove chalk powder on the glass display panel when wiped with an eraser, and the physical wiping difficulty is relatively low. In addition, the glass display panel also has a good display effect. In summary, the above glass display panel takes into account the various performance requirements of the smart blackboard for display and writing. The display performance and writing performance of the smart blackboard of this application are both excellent.
[0061] In addition, the curved surfaces of the writing surface of this embodiment are smooth or nearly smooth, and are relatively uniform in size. In addition to having excellent powder-coating and wiping properties, they also have anti-glare functions, can increase the viewing angle, and have a good touch feel.
[0062] A second aspect of the present application provides a method for preparing a smart blackboard. In one embodiment, the method for preparing the smart blackboard includes the following steps:
[0063] S10, forming a writing surface on a glass plate to prepare a glass display panel.
[0064] The glass plate can be obtained by slicing the glass. It is understandable that after slicing, a cleaning step is also included.
[0065] The glass plate has a front side and a back side opposite to each other. A writing surface is formed on the front side of the glass plate. Before forming the writing surface, the process further includes pasting an acid-resistant protective film on the back side of the glass plate.
[0066] The writing surface can be formed on the front side of the glass plate by etching. Optionally, forming the writing surface on the glass plate includes the following steps:
[0067] S11, performing pickling treatment on the glass plate.
[0068] Optionally, the glass plate may be cleaned before the pickling treatment, with the cleaning time being 1 to 5 minutes.
[0069] Optionally, the pickling agent includes hydrofluoric acid. In this embodiment, the front surface of the glass plate is pickled using an aqueous solution of hydrofluoric acid, wherein the mass concentration of hydrofluoric acid in the aqueous solution is 3% to 7%. Optionally, the pickling time is 5 minutes to 15 minutes.
[0070] S12, frosting the pickled glass plate.
[0071] In this embodiment, the glass plate after acid washing is frosted using a frosting liquid.
[0072] Optionally, the frosting solution primarily comprises a fluoride and an acid, wherein the fluoride comprises at least one of ammonium fluoride, potassium bifluoride, and calcium fluoride, and the acid comprises at least one of hydrochloric acid and sulfuric acid. Optionally, the frosting solution comprises the following components in the following weight percentages: 15% to 25% fluoride; 5% to 10% acid; and 60% to 80% water. Optionally, the frosting treatment lasts for 2 to 3 minutes.
[0073] S13, performing liquid polishing on the frosted glass plate.
[0074] Optionally, the polishing liquid includes hydrofluoric acid, and the temperature of the liquid polishing process is 25°C to 35°C. The mass concentration of the hydrofluoric acid aqueous solution is 10% to 20%, and the total liquid polishing time is 30 to 60 minutes. The liquid polishing process is divided into multiple tanks for tank processing to improve production efficiency. Optionally, 3 to 4 tanks are used for liquid polishing, and each tank is polished for 10 to 15 minutes.
[0075] By etching the glass plate as described above, a number of curved protrusions can be formed on the front side of the glass plate, and different roughness, haze, glossiness and DOI (distinctness of image) can be obtained by controlling the time of pickling, frosting and liquid polishing.
[0076] In this embodiment, after the etching process, the writing surface has a plurality of curved protrusions and meets the following conditions:
[0077] (1) Roughness Ra is 0.5μm~1.1μm; (2) Roughness Rz is 5μm±1.5μm; (3) Roughness Rsm≤250μm; (4) Haze is 30±10%; (5) DOI is 1±1; (6) Gloss is 25±10.
[0078] Compared with the traditional method of forming a writing surface on the front of a glass plate by spraying, forming a writing surface on a glass plate by the above-mentioned etching treatment method has the following advantages: (1) The roughness and optical parameters of the writing surface formed by etching are easier to control, and it is easier to obtain a writing surface whose roughness Ra, roughness Rz, roughness Rsm, haze, DOI and gloss meet the above requirements; (2) The writing surface is an integrated structure on the glass plate, and there is no problem of poor adhesion of the writing coating formed by spraying to the glass plate. The writing surface formed by the above-mentioned method has good wear resistance; (3) The production of high haze is relatively simple and low cost; (4) The touch feel is good; (5) The size of the arc surface protrusions is more uniform, the display effect is good, and the anti-glare performance is excellent; (6) The viewing angle can be increased.
[0079] Optionally, the process parameters of the pickling treatment, frosting treatment and liquid polishing treatment are controlled so that the plurality of arc-surface protrusions on the writing surface enclose a plurality of pits, and the equivalent diameters D of the plurality of pits are independently 15 μm to 45 μm.
[0080] Optionally, the process parameters of the pickling treatment, frosting treatment and liquid polishing treatment are controlled so that the angle θ between the intersection point of the two intersecting arc-surface protrusions on the writing surface and the two tangent lines passing through the intersection point is 140°~160°; wherein the two tangent lines refer to the tangent lines from the intersection point to the direction close to the apex of each arc surface.
[0081] Optionally, process parameters of the pickling treatment, the frosting treatment, and the liquid polishing treatment are controlled so that the visible light transmittance of the glass display panel is ≥88%.
[0082] Optionally, the process parameters of the pickling treatment, the frosting treatment and the liquid polishing treatment are controlled so that the thickness of the glass plate is 2 mm to 4 mm.
[0083] Optionally, after the writing surface is formed, the method further includes the following steps: tempering the glass plate forming the writing surface.
[0084] It is understandable that the process of preparing the glass display panel may also include other pre-process steps (such as edge grinding) and other post-process steps, and finally the glass display panel is cleaned, packaged and shipped.
[0085] S20. Assemble the glass display panel and the display control assembly, and locate the display control assembly on the back side of the glass display panel opposite to the writing surface, to prepare the smart blackboard.
[0086] The following is further described in conjunction with specific examples and comparative examples. Unless otherwise specified, the raw materials involved in the following specific examples and comparative examples can be sourced from commercial sources. The instruments used can be sourced from commercial sources unless otherwise specified. The processes involved can be selected conventionally by those skilled in the art unless otherwise specified.
[0087] Example 1 to Example 5 and Comparative Example 1 to Comparative Example 2
[0088] Each embodiment and comparative example provides a glass display panel and a method for manufacturing the same, and the steps are as follows:
[0089] Glass was sliced to obtain glass plates. An acid-resistant protective film was applied to the back of the glass plates. After applying the acid-resistant protective film, the edges were ground. After edge grinding, the glass plates were cleaned. The front of the glass plates was then subjected to acid pickling, frosting, and liquid polishing in sequence to form a writing surface. The treatment times are shown in Table 1. The pickling agent was a 5wt% hydrofluoric acid aqueous solution. The frosting solution consisted of 20wt% ammonium fluoride, 10wt% hydrochloric acid, and 70wt% water. The liquid polishing agent was a 15wt% hydrofluoric acid aqueous solution.
[0090] After forming the writing surface on the front of the glass plate, it is tempered. After the tempering, black ink is silk-screened around the back of the glass plate to obtain a glass display panel to block light leakage from the edge of the display screen.
[0091] The writing surface of the glass display panel of each embodiment and comparative example was characterized by SEM, wherein the SEM image of the writing surface of Example 1 is shown in FIG. Figure 1 and Figure 2 .according to Figure 1 and Figure 2It can be seen that the writing surface of Example 1 has several smooth or nearly smooth arc-shaped protrusions with relatively uniform size, and several of the arc-shaped protrusions enclose several pits. Figure 3 , see the SEM picture of the writing surface of Example 3 Figure 4 , see the SEM picture of the writing surface of Example 4 Figure 5 , see the SEM picture of the writing surface of Example 5 Figure 6 , the SEM picture of the writing surface of comparative example 1 is shown in Figure 7 , the SEM picture of the writing surface of comparative example 2 is shown in Figure 8 In the SEM images of the various embodiments and comparative examples, the equivalent diameters D of several of the dimples and the angle θ between the intersection of two intersecting arc-surface protrusions and two tangent lines passing through the intersection were measured. The results are shown in Table 1.
[0092] The visible light transmittance of the glass display panels of each embodiment was tested before and after the light-transmitting ink layer was formed. The results are shown in Table 1. The haze, DOI, and glossiness of the writing surface of the glass display panels of each embodiment were tested. The results are shown in Table 1. The roughness Ra, Rz, and Rsm of the writing surface of the glass display panels were tested. The results are shown in Table 1.
[0093] Table 1
[0094]
[0095] The writing performance of the glass display panels of the above embodiments and comparative examples was tested using the following method. The results are shown in Table 2.
[0096] a. Powdering: We uniformly use Qianhui chalks commonly used by our company. Rub the side of the chalk evenly on the glass for a distance of 5 cm and write 10 numbers. See the figure of the writing surface after powdering in Example 1. Figure 9 , see the figure after the writing surface of Example 2 is powdered. Figure 10 , see the figure after the writing surface of Example 3 is powdered. Figure 11 , see the figure after the writing surface of Example 4 is powdered. Figure 12 , see the figure after the writing surface of Example 5 is powdered. Figure 13 , the figure after the writing surface of comparative example 1 is powdered is shown in FIG. Figure 14 , the figure after the writing surface of comparative example 2 is powdered is shown in FIG. Figure 15 .
[0097] b. Wipe: Use the self-priming whiteboard eraser (can be used for both blackboards and whiteboards) from Deli Office Store in JD.com.
[0098] c. Evaluation: Five volunteers subjectively scored the powder coating effect on a scale of 0 to 100, with 60 being a passing score. Higher scores indicate better coating. Powder coating effect is divided into two dimensions: coating thickness and coating density, each accounting for 50% of the score. Wiping is scored on a scale of 0 to 100, with 60 being a passing score. Higher scores indicate cleaner wiping. The average score was taken.
[0099] The SMS-1000 equipment of Naiqite International Co., Ltd. was used to test the overall lightning value of the glass display panels of the above-mentioned embodiments and comparative examples. The flash point calculation method is: Sparkle=σ / μ, Sparkle represents the flash point value, σ represents the standard deviation of the grayscale level of the filtered image, and μ represents the average grayscale level of the filtered image. The results are shown in Table 2.
[0100] Table 2
[0101]
[0102] As shown in Tables 1 and 2, Examples 1 to 5 control the pickling time (5 minutes), frosting time (2 minutes to 2 minutes 40 seconds), and total liquid polishing time (40 minutes to 45 minutes). The roughness Ra of the writing surface of the glass display panel is controlled within a range of 0.65 μm to 1.04 μm, Rz is controlled within a range of 4.1 μm to 5.9 μm, and Rsm is controlled within a range of 116.98 μm to 186.16. The haze on the writing surface is controlled within a range of 28.39% to 34.12%, the DOI is controlled within a range of 0.3 to 0.7, and the gloss is controlled within a range of 19 to 22. The equivalent diameter D of the pit is controlled within a range of 20.5 μm to 40.7 μm, and the angle θ between the intersection point of two intersecting arc-shaped protrusions and the two tangent lines passing through the intersection point is controlled within a range of 146° to 152°. The optical parameters of the glass display panels of each embodiment can meet the display requirements. At the same time, they are easy to adhere to chalk and easy to wipe with an eraser. Although the haze, DOI, and glossiness of Comparative Examples 1 and 2 can meet the display requirements, it is difficult to adhere to chalk on the glass display panel of Comparative Example 1, and it is difficult to wipe the glass display panel of Comparative Example 2. In addition, the lightning value of Comparative Example 2 is high, which can easily cause dizziness when viewing.
[0103] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0104] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.
Claims
1. A smart blackboard, characterized in that: including a glass display panel and a display control assembly; The glass display panel includes a writing surface and a back surface opposite to the writing surface, and the display control component is located on one side of the back surface and is used to control the display of the glass display panel; The writing surface has a plurality of curved protrusions and meets the following conditions: (1) Roughness Ra is 0.5μm~1.1μm; (2) Roughness Rz is 5μm±1.5μm; (3) Roughness Rsm≤250μm; (4) Haze is 30±10%; (5) DOI is 1±1; (6) Gloss is 25±10.
2. The smart blackboard according to claim 1, characterized in that: The plurality of arc-surface protrusions enclose a plurality of pits, and the equivalent diameters D of the plurality of pits are independently 15 μm to 45 μm.
3. The smart blackboard according to claim 1, characterized in that: The angle θ between the intersection point of the two intersecting arc-surface protrusions and the two tangent lines passing through the intersection point is 140°~160°; wherein, the two tangent lines refer to the tangent lines from the intersection point to the direction close to the apex of each arc surface.
4. The smart blackboard according to any one of claims 1 to 3, characterized in that: The visible light transmittance of the glass display panel is ≥88%.
5. The smart blackboard according to any one of claims 1 to 3, characterized in that: The thickness of the glass plate is 2 mm to 4 mm.
6. A method for preparing a smart blackboard, characterized in that: The following steps are involved: A writing surface is formed on a glass plate, so that the writing surface has a plurality of curved protrusions and satisfies the following conditions: (1) roughness Ra is 0.5 μm to 1.1 μm; (2) roughness Rz is 5 μm ± 1.5 μm; (3) roughness Rsm ≤ 250 μm; (4) haze is 30 ± 10%; (5) DOI is 1 ± 1; (6) gloss is 25 ± 10; and a glass display panel is prepared; The glass display panel and the display control assembly are assembled, and the display control assembly is located on the back side of the glass display panel opposite to the writing surface to prepare the smart blackboard.
7. The method for preparing the smart blackboard according to claim 6, wherein: Forming the writing surface on the glass plate comprises the following steps: sequentially performing acid washing, frosting and liquid polishing on the glass plate.
8. The method for preparing the smart blackboard according to claim 7, wherein: The process parameters of the pickling treatment, the frosting treatment, and the liquid polishing treatment are controlled so that the writing surface or the glass display panel meets at least one of the following conditions: (1) The plurality of arc-surface protrusions enclose a plurality of pits, and the equivalent diameters D of the plurality of pits are independently 15 μm to 45 μm; (2) The angle θ between the intersection point of the two intersecting arc-surface protrusions and the two tangent lines passing through the intersection point is 140° to 160°; wherein the two tangent lines refer to the tangent lines from the intersection point to the direction close to the apex of each arc surface; (3) The visible light transmittance of the glass display panel is ≥88%; (4) The thickness of the glass plate is 2 mm to 4 mm.
9. The method for preparing the smart blackboard according to claim 8, wherein: Include at least one of the following features: (1) The pickling treatment reagent includes an aqueous solution of hydrofluoric acid, and the mass concentration of the aqueous solution of hydrofluoric acid is 3% to 7%; (2) The pickling treatment time is 5 minutes to 15 minutes; (3) The frosting solution of the frosting treatment comprises the following components in percentage by mass: 15% to 25% of fluoride; 5% to 10% of acid; and 60% to 80% of water; (4) The frosting treatment time is 2 min to 3 min; (5) The polishing liquid of the liquid polishing treatment includes an aqueous solution of hydrofluoric acid, and the mass concentration of the aqueous solution of hydrofluoric acid is 10% to 20%; (6) The temperature of the liquid throwing treatment is 25°C~35°C, and the total liquid throwing time is 30min~60min.
10. The method for preparing the smart blackboard according to any one of claims 6 to 9, characterized in that: After the writing surface is formed, the method further comprises the following steps: performing a tempering treatment on the glass plate forming the writing surface.