Cover plate glass manufacturing method, cover plate glass, display module and application

Abstract

The invention relates to a manufacturing method of cover plate glass, the cover plate glass, a display module and application, glass to be treated is subjected to frosting treatment, and frosted glass comprising at least one treatment surface is obtained; and carrying out multiple times of polishing treatment on the treated surface of the frosted glass to obtain the cover plate glass, the roughness height average value of the cover plate glass is 0.1-0.3 [mu] m, the roughness interval average value is less than or equal to 55 [mu] m, the transmittance is greater than or equal to 88%, and the haze is 5-15%. The anti-dazzle cover plate glass can be obtained through frosting treatment and multiple times of polishing treatment, the anti-dazzle effect of the cover plate glass is effectively improved, the optical performance of the cover plate glass can be improved, and the display quality is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display screens, and in particular to a method for manufacturing cover glass, the cover glass, a display module and applications. Background Art

[0002] In the field of modern display technology, various types of displays, including liquid crystal displays (LCDs) and organic light-emitting diode (OLED) displays, use cover glass as the outermost structure to protect the internal display components and provide a smooth touch surface. However, the smooth cover glass surface may produce significant glare, especially in strong lighting environments, which will interfere with users' viewing of the content on the display.

[0003] In order to reduce glare and improve viewing comfort, many display devices use anti-glare (AG) treatment on their cover glass, usually by etching the glass surface to reduce its (mirror) reflectivity. Although the existing AG treatment process can reduce glare to a certain extent, glare may still occur in certain situations, such as when viewing from the side or under strong background light. Summary of the invention

[0004] The embodiment of the present invention provides a method for manufacturing a cover glass, a cover glass, a display module and an application thereof, and by performing an anti-glare etching process on the cover glass, the anti-glare performance can be enhanced, the optical performance can be improved, and the display quality can be improved. The above technical solution is as follows:

[0005] In a first aspect, an embodiment of the present invention provides a method for manufacturing a cover glass, the method comprising:

[0006] frosting the glass to be treated to obtain frosted glass including at least one treated surface;

[0007] The treated surface of the frosted glass is subjected to multiple polishing processes to obtain the cover glass;

[0008] The average roughness height of the cover glass is 0.1 μm-0.3 μm, the average roughness interval is ≤55 μm, the transmittance is ≥88%, and the haze is 5%-15%.

[0009] Preferably, the frosting liquid used in the frosting treatment comprises the following components by mass percentage:

[0010] Ammonium fluoride 40-60%, ammonium sulfate 5-10%, sulfuric acid 10-20%, hydrofluoric acid 5-10%, water 20-40%.

[0011] Preferably, the average roughness height of the frosted glass surface is 0.4 μm-0.6 μm, the average roughness interval is ≤35 μm, the transmittance is ≥88%, and the haze is 45%-55%;

[0012] The glossiness of the treated surface of the frosted glass is ≤10, the image clarity is ≤2, the flash point value is ≤5%, the total reflection is ≤8%, and the diffuse reflection is ≥5%.

[0013] Preferably, the multiple polishing processes include at least three polishing processes, and each polishing process uses a polishing liquid containing hydrofluoric acid; the content of hydrofluoric acid in the polishing liquid gradually decreases with the increase of the number of polishing times.

[0014] Preferably, the multi-pass polishing process includes a first polishing process, a second polishing process and a third polishing process; the mass percentage content of hydrofluoric acid in the first polishing solution used in the first polishing process is (20-40)%; the mass percentage content of hydrofluoric acid in the second polishing solution used in the second polishing process is (10-30)%; the mass percentage content of hydrofluoric acid in the third polishing solution used in the third polishing process is (5-20)%.

[0015] Preferably, the ratio of the hydrofluoric acid content used in the first polishing liquid, the second polishing liquid and the third polishing liquid is (4-6):(1.5-3):1.

[0016] Preferably, the glossiness of the cover glass is ≤20, the image clarity is ≤5, the flash point value is ≤1%, the total reflection is ≤8%, and the diffuse reflection is ≥2%.

[0017] Preferably, the frosting treatment is performed at a temperature of 30-40°C and for a time of 15-25 seconds;

[0018] The processing temperature of the above-mentioned multiple polishing processes is 25-35° C., and the processing time of each polishing process is 15-25 seconds.

[0019] In a second aspect, an embodiment of the present invention provides a cover glass manufactured by any of the above methods.

[0020] In a third aspect, an embodiment of the present invention provides a display module, which includes the above-mentioned cover glass.

[0021] In a fourth aspect, an embodiment of the present invention provides application of the above display module in an LCD liquid crystal display.

[0022] In the embodiment of the present invention, the glass to be processed is frosted to obtain frosted glass including at least one processed surface; the processed surface of the frosted glass is subjected to multiple polishing processes to obtain the cover glass; the average roughness height of the cover glass is 0.1μm-0.3μm, the average roughness interval is ≤55μm, the transmittance is ≥88%, and the haze is 5%-15%. The present invention can obtain an anti-glare cover glass through frosting and multiple polishing processes, effectively improving the anti-glare effect of the cover glass, and can also improve its touch feel and optical performance, and significantly improve the display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a manufacturing process flow of a cover glass is provided in an exemplary embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a display module provided by an exemplary embodiment of the present invention;

[0026] Figure 3 A schematic diagram of a manufacturing process flow of a cover glass provided in Example 1 of the present invention;

[0027] Figure 4 A schematic diagram of the structure of a cover glass provided in Example 1 of the present invention;

[0028] Figure 5 A schematic diagram of the microstructure of an anti-glare layer of a cover glass provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] In the present invention, values ​​of component content, processing temperature, processing time, etc. are expressed as ab, which means that the values ​​of component content, processing temperature, processing time, etc. can be any value between a and b, including a and b.

[0031] In the prior art, the cover glass of display screens such as liquid crystal displays is often treated with AG to reduce glare, by etching the glass surface to reduce its reflectivity. Although the existing cover glass AG treatment can reduce glare to a certain extent, the existing AG treatment process also has certain limitations in controlling the optical properties of the cover glass, such as transmittance, haze, image clarity (Distinctness of Image, DOI), glossiness, etc. For example, in certain circumstances, such as when viewed from the side or under strong background light, glare may still occur, and the cover glass has many sparkles.

[0032] Therefore, an embodiment of the present invention provides a method for manufacturing a cover glass, such as Figure 1 As shown, the method includes:

[0033] frosting the glass to be treated to obtain frosted glass including at least one treated surface;

[0034] The treated surface of the frosted glass is subjected to multiple polishing processes to obtain the cover glass.

[0035] The average roughness height of the anti-glare surface of the cover glass is 0.1 μm-0.3 μm, the average roughness interval is ≤55 μm, the transmittance is ≥88%, and the haze is 5%-15%.

[0036] Specifically, the frosting treatment and the multi-pass polishing treatment in the embodiment of the present invention are both etching treatments, and the glass (plate) can be etched on one side or both sides in an immersion manner, so that the frosted glass and the cover glass have one or two treated surfaces (anti-glare surfaces); wherein the anti-glare surface of the cover glass is obtained by performing multiple polishing treatments on the treated surface of the frosted glass. In the embodiment of the present invention, the etching treatment is preferably double-sided etching, that is, the frosted glass has two treated surfaces, and the cover glass has two anti-glare surfaces. The use of double-sided etching can achieve a better anti-glare effect at a lower cost.

[0037] Frosted glass is glass that has been frosted after being treated. It is an intermediate product in the production of cover glass. Frosting can form a roughness on the glass surface to scatter incident light. This scattering effect helps to reduce the reflectivity and glossiness of the glass surface, so as to achieve an anti-glare effect. In the embodiment of the present invention, the average roughness height (Ra) of the frosted glass treatment surface is 0.4μm-0.6μm, the average roughness interval (Rsm) is ≤35μm, the transmittance is ≥88%, and the haze is 45%-55%. It still maintains a high transmittance and a suitable haze under the condition of having a high roughness. The frosted glass is used for subsequent polishing to obtain a cover glass with a higher anti-glare effect and display effect.

[0038] In order to achieve better etching effects, a glass raw material that can withstand the etching process and has appropriate optical properties should be selected during etching. For example, a glass raw material with good corrosion resistance, heat resistance and excellent optical transparency can be selected. Optionally, in the embodiment of the present invention, the glass to be processed is selected from soda-lime glass, high-aluminum glass, lithium-aluminum glass and other glass raw materials.

[0039] In order to enable the frosting treatment to achieve the above performance indicators, some embodiments of the present invention further provide a frosting solution for etching in the frosting treatment; the frosting solution comprises the following components by mass percentage:

[0040] Ammonium fluoride 40-60%, ammonium sulfate 5-10%, sulfuric acid 10-20%, hydrofluoric acid 5-10%, water 20-40%.

[0041] Optionally, the frosting liquid includes the following components by mass percentage: 40% ammonium fluoride, 7% ammonium sulfate, 10% sulfuric acid, 5% hydrofluoric acid, and 38% water.

[0042] Optionally, the frosting liquid includes the following components by mass percentage: 60% ammonium fluoride, 5% ammonium sulfate, 10% sulfuric acid, 5% hydrofluoric acid, and 20% water.

[0043] Optionally, the frosting liquid includes the following components by mass percentage: 50% ammonium fluoride, 5% ammonium sulfate, 13% sulfuric acid, 7% hydrofluoric acid, and 25% water.

[0044] Optionally, the frosting liquid includes the following components by mass percentage: 45-53% ammonium fluoride, 5-9% ammonium sulfate, 10-15% sulfuric acid, 5-7% hydrofluoric acid, and 25-30% water.

[0045] Specifically, the embodiment of the present invention uses the frosting liquid of the above-mentioned special ratio to etch the glass raw material. The addition of hydrofluoric acid in the frosting liquid helps to establish a stable and uniform reaction environment between ammonium fluoride, ammonium sulfate and sulfuric acid. In this environment, ammonium fluoride, ammonium sulfate and sulfuric acid can interact to generate more hydrofluoric acid to enhance the etching effect on the glass, and also help to control the etching process so that it is carried out at a suitable speed and intensity to avoid over-etching or under-etching. Therefore, by adjusting the ratio of hydrofluoric acid, ammonium fluoride, ammonium sulfate and sulfuric acid, the entire etching process can be effectively controlled to achieve an ideal etching effect, creating an ideal foundation for the subsequent polishing process.

[0046] In some embodiments of the present invention, in order to ensure the etching effect of the frosting treatment, the treatment temperature of the frosting treatment is 30-40°C, and the treatment time is 15-25 seconds; optionally, the treatment temperature can be 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C or a range consisting of any two of the above values, and the treatment time can be 15s, 16s, 17s, 18s, 19s, 20s, 21s, 22s, 23s, 24s, 25s or a range consisting of any two of the above values.

[0047] Specifically, the treatment temperature and time of the frosting treatment are set to ensure the normal progress of the etching reaction. For example, if the temperature is too low, the reaction speed will be reduced and the ideal etching effect may not be obtained; if the temperature is too high, the reaction speed may be too fast, resulting in excessive etching depth and inability to control the roughness. Similarly, if the treatment time is too short, the etching depth may be insufficient and the ideal roughness cannot be obtained; if the treatment time is too long, the etching depth may be too large, affecting the optical properties and mechanical strength of the glass.

[0048] In an embodiment of the present invention, the frosted glass obtained by the above frosting treatment, in addition to meeting the above roughness, transmittance and haze indicators, has a treated surface gloss ≤10, image clarity ≤2, flash point value ≤5%, total reflection (SCI) ≤8%, and diffuse reflection (SCE) ≥5%.

[0049] Specifically, through the above-mentioned frosting treatment, the frosted glass obtained can not only provide high transmittance and moderate haze, but also has the properties of low gloss, low image clarity, low flash point value, low total reflection and high diffuse reflection, which makes it have excellent anti-glare effect, while also ensuring that the cover glass obtained by subsequent polishing treatment has good image clarity and display quality when used in the display module.

[0050] Among them, glossiness indicates the ability of the glass surface to reflect light. The lower the glossiness, the weaker the reflectivity to light, which helps to reduce glare caused by light reflection; image clarity indicates the clarity of the image reflected by the glass surface. The lower the clarity, the better the anti-reflection and glare effects; total reflection includes specular reflection and diffuse reflection. When the total reflection is low, the higher the diffuse reflection, the lower the specular reflectivity; the flash point value indicates the area proportion of visual noise or flickering caused by irregular etching on the glass surface. A low flash point value can ensure the quality of the displayed image.

[0051] Optionally, in some embodiments of the present invention, the glass to be treated is pretreated glass, and the pretreatment can make the glass reach a suitable physical and chemical state before entering the frosting treatment step to ensure the effect and quality of the frosting treatment. The pretreatment steps include:

[0052] The glass raw materials are cleaned with pure water, alkaline solution and acid solution to obtain the glass to be processed.

[0053] Specifically, pure water cleaning is mainly used to remove coarse impurities on the surface of the glass. Deionized water or pure water can be used to prevent the ions in the water from interfering with the subsequent processing steps. In this step, the glass can be completely immersed in water, or rinsed with a high-pressure water gun or other tools under constant temperature conditions. For alkali cleaning of the glass after pure water cleaning, an alkaline solution (such as sodium hydroxide or potassium hydroxide aqueous solution) can be used for soaking or spraying. The alkaline solution can effectively remove oil and organic matter on the surface of the glass, and can be carried out at a certain temperature for a period of time to ensure sufficient cleaning. For acid cleaning of the glass after alkali cleaning, an acidic solution (such as sulfuric acid, hydrochloric acid, phosphoric acid or acetic acid, etc.) can be used for soaking or spraying. The acidic solution can remove inorganic salts and residues of the alkaline solution on the surface of the glass, which can also be carried out at a certain temperature for a period of time to ensure sufficient cleaning.

[0054] It should be noted that after each of the above cleaning steps, a water rinse step is required to remove the residue of the cleaning solution used in the previous step. After cleaning, the glass can be dried in a dust-free environment to prevent new impurities from attaching. This pretreatment step ensures that the glass surface is clean and uniform before etching, so that better etching results can be achieved.

[0055] In the embodiment of the present invention, the processed surface of the frosted glass can be subjected to multiple polishing processes to obtain a cover glass with an anti-glare effect. The purpose of subjecting the frosted glass to multiple polishing processes is to further optimize the frosted etched glass surface, eliminate unnecessary roughness and unevenness, and maintain sufficient scattering to achieve an anti-glare effect. Specifically, after the processed surface of the frosted glass is subjected to multiple polishing processes, the average roughness height (Ra) is 0.1μm-0.3μm, the average roughness interval is ≤55μm, the transmittance is ≥88%, and the haze is 5%-15%. After multiple polishing processes, the roughness and haze are reduced, so that the cover glass can have better display quality when used in a display module while maintaining a good anti-glare effect.

[0056] In order to achieve the above performance indicators in the multi-pass polishing process, the embodiment of the present invention uses a polishing liquid containing hydrofluoric acid in each polishing process; and the content of hydrofluoric acid in the polishing liquid gradually decreases with the increase of the number of polishing times.

[0057] Specifically, in the multi-pass polishing process, each polishing process uses a polishing liquid containing hydrofluoric acid, and the content of hydrofluoric acid in the polishing liquid gradually decreases as the number of polishing times increases. For example, the first polishing process may use a polishing liquid containing a higher content of hydrofluoric acid (such as 40%), the purpose of which is to remove the large surface roughness and etching marks that may exist after the frosting treatment; then, as the number of polishing times increases, the hydrofluoric acid content gradually decreases (such as 30%, 20%) to further fine-tune the roughness and light scattering of the glass surface. The purpose of reducing the hydrofluoric acid content is to control the intensity of polishing and avoid excessive polishing that causes the glass surface to be too smooth, thereby losing the anti-glare effect. In addition, this strategy of reducing the hydrofluoric acid content according to the number of polishing times is also conducive to optimizing the polishing process, making it more refined and orderly, so that while achieving the anti-glare effect, it can also maintain the excellent optical properties of the glass surface.

[0058] In some embodiments of the present invention, the above-mentioned multi-pass polishing process includes a first polishing, a second polishing and a third polishing; the mass percentage content of hydrofluoric acid in the first polishing liquid used in the first polishing is (20-40)%; the mass percentage content of hydrofluoric acid in the second polishing liquid used in the second polishing is (10-30)%; the mass percentage content of hydrofluoric acid in the third polishing liquid used in the third polishing is (5-20)%.

[0059] Optionally, the mass percentage content of hydrofluoric acid in the first polishing liquid can be 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40% or a range consisting of any two of the above values.

[0060] Optionally, the mass percentage content of hydrofluoric acid in the second polishing liquid can be 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30% or a range consisting of any two of the above values.

[0061] Optionally, the mass percentage content of hydrofluoric acid in the third polishing liquid may be 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20% or a range consisting of any two of the above values.

[0062] Specifically, by setting the first polishing, the second polishing and the third polishing, the fineness of the polishing process can be gradually improved, which helps to adjust the surface roughness of the glass more finely. At the same time, by controlling the hydrofluoric acid content, the etching effect of the polishing liquid on the glass surface can be accurately controlled. Gradually reducing the content of hydrofluoric acid can gradually reduce the roughness of the glass surface after each polishing process, thereby better realizing an anti-glare cover glass with excellent optical properties. If the number of polishing times is small, it is difficult to accurately control the reflection and scattering effects, and it is difficult to maintain the optical properties of the glass; if the number of polishing times is large, the polishing cost is greatly increased, and it is easy to over-polish and affect its anti-glare effect. Optionally, the components of the above-mentioned polishing liquid are hydrofluoric acid and water.

[0063] In some embodiments of the present invention, the ratio of the hydrofluoric acid content used in the first polishing liquid, the second polishing liquid and the third polishing liquid is (4-6):(1.5-3):1.

[0064] Optionally, the above hydrofluoric acid content ratio can be 4:2:1, 5:2:1, 6:2:1, 6:3:1, 5:3:1, 4:3:1.

[0065] Optionally, the first polishing liquid contains 40% hydrofluoric acid by weight, the second polishing liquid contains 20% hydrofluoric acid by weight, and the third polishing liquid contains 10% hydrofluoric acid by weight.

[0066] Optionally, the first polishing liquid contains 30% hydrofluoric acid by weight, the second polishing liquid contains 15% hydrofluoric acid by weight, and the third polishing liquid contains 5% hydrofluoric acid by weight.

[0067] Optionally, the mass percentage of hydrofluoric acid used in the first polishing liquid is 35%, the mass percentage of hydrofluoric acid used in the second polishing liquid is 14%, and the mass percentage of hydrofluoric acid used in the third polishing liquid is 7%.

[0068] Specifically, in the above three polishing processes, the content of hydrofluoric acid gradually decreases. This gradient reduction is to better control the polishing process and achieve precise and detailed polishing effects. In the first polishing process, due to the high content of hydrofluoric acid, the rough parts of the glass surface can be etched away more effectively, and the surface of the frosted glass can be further optimized. In the second polishing process, the hydrofluoric acid content is moderate, which can smooth the glass surface, reduce the irregularities caused by frosting, and optimize the light scattering effect. In the third polishing process, the hydrofluoric acid content is the lowest, and its main function is to fine-tune and optimize the glass surface, eliminate possible small defects, and further enhance the anti-glare effect. Therefore, by controlling the proportion of hydrofluoric acid content in the three polishing processes, the best etching and polishing effects can be achieved under the above-mentioned proportional relationship, thereby achieving an ideal anti-glare effect.

[0069] In some embodiments of the present invention, in order to ensure the etching effect of multiple polishing treatments, the processing temperature of each polishing treatment is 25-35°C, and the processing time of each polishing treatment is 15-25 seconds; optionally, the processing temperature can be 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, 31°C, 32°C, 33°C, 34°C, 35°C or a range consisting of any two of the above values, and the processing time can be 15s, 16s, 17s, 18s, 19s, 20s, 21s, 22s, 23s, 24s, 25s or a range consisting of any two of the above values.

[0070] Specifically, controlling the processing temperature and processing time of the multi-pass polishing process can control the polishing etching rate and depth. Under the above-mentioned hydrofluoric acid content ratio relationship of the multi-pass polishing process, combined with the above-mentioned processing temperature and processing time, it is possible to ensure that the polishing etching is fully carried out, and to avoid over-polishing, and to achieve an efficient, fine, and uniform polishing effect, thereby achieving an ideal anti-glare effect and optical performance.

[0071] In the embodiment of the present invention, the cover glass obtained by the above-mentioned multiple polishing treatment not only meets the above-mentioned roughness, transmittance and haze indicators, but also has an anti-glare surface gloss ≤20, image clarity ≤5; a flash point value ≤1%, total reflection ≤8%, and diffuse reflection ≥2%.

[0072] Specifically, through the above-mentioned multiple polishing treatments, the obtained cover glass can not only provide the properties of low gloss, low image clarity, low total reflection and high diffuse reflection, and has an excellent anti-glare effect; it can also provide lower haze, low flash point value and high transmittance, ensuring that the cover glass used in the display module has better image clarity and display quality.

[0073] It should be noted that, in the embodiments of the present invention, the above performance indicators are all measured on the treated surface of the frosted glass or the anti-glare surface of the cover glass. The specific measurement method is as follows:

[0074] The roughness Ra and Rsm are measured with a surface roughness meter (surface profile meter) in accordance with ISO 4287; the transmittance is measured with a transmission photometer in accordance with ISO 13468; the haze is measured with a spectrophotometer in accordance with ISO 14782; the gloss is measured with a glossmeter in accordance with ISO 2813; the distinctness of image (DOI) is measured with a glossmeter in accordance with ASTM D5767; the sparkle point value (Sparkle) is measured with a spectroradiometer to measure the area percentage of visual noise or sparkle on a gray background; the total reflection (SCI) and diffuse reflection (SCE) are measured with a colorimeter in accordance with ASTM E308.

[0075] In some embodiments of the present invention, a cleaning process is further included after the sanding process and each polishing process.

[0076] Specifically, the cleaning process can effectively remove the etching solution residue of the previous step to prevent the residual etching solution from interfering with or weakening the etching solution of the next step. The cleaning process can also remove the tiny particles or etching products generated during the etching process to prevent the tiny particles from being embedded in the glass surface and affecting its feel and polishing effect. In this embodiment, the cleaning process is performed after the frosting process and each polishing process step, which can ensure that each step of the polishing process is performed on an almost clean surface, thereby improving the quality and effect of the polishing.

[0077] In some embodiments of the present invention, after the polishing process, the cover glass needs to be post-processed. The post-processing steps may include:

[0078] Cleaning: Remove the etching solution, impurities and particles that may remain on the glass surface during the etching process to prevent these residues from affecting the optical properties of the anti-glare cover glass.

[0079] Edge grinding: Removing sharp parts of the glass edge to prevent breakage of the glass or injury to the operator during subsequent processing steps. This can be done by physical grinding using coarse sandpaper or grinding wheels.

[0080] Tempering: The internal structure of the glass can be changed by rapid cooling, making the glass have higher compressive strength and preventing it from breaking easily during use. For example, steel heats the glass to a certain temperature (such as about 600 degrees) and then quickly cools it with cold air.

[0081] Printing: Some desired logos, patterns or designs can be printed on the glass. This can be done by screen printing or digital printing.

[0082] Inspection: Ensures that all processing steps have been completed correctly and that the product meets all quality and performance standards. This may include visual inspection of the glass to look for any visible flaws such as scratches, bubbles or uneven color, as well as testing for physical properties such as hardness, optical properties, etc.

[0083] After these post-processing steps, an anti-glare cover glass with excellent quality and stable performance can be obtained.

[0084] In the embodiment of the present invention, the glass to be processed is frosted to obtain frosted glass including at least one processed surface; the processed surface of the frosted glass is subjected to multiple polishing processes to obtain the cover glass; the average roughness height of the cover glass is 0.1μm-0.3μm, the average roughness interval is ≤55μm, the transmittance is ≥88%, and the haze is 5%-15%. The present invention can obtain an anti-glare cover glass through frosting and multiple polishing processes, effectively improving the anti-glare effect of the cover glass, and can also improve its touch feel and optical performance, and significantly improve the display quality.

[0085] The technical solution of the present invention will be described below in conjunction with specific embodiments. The raw materials used in the following embodiments are all from common commercially available products, and the devices or equipment used are all purchased from conventional market sales channels.

[0086] Example 1

[0087] Embodiment 1 provides a display module, such as Figure 2 As shown, the display module includes a cover glass 1, a polarizer 2 and a liquid crystal panel 3. The cover glass 1 is an anti-glare cover glass, and the cover glass 1 is treated with double-sided etching for anti-glare; the polarizer 2 can be a smooth POL, which can control the vibration direction of the light passing through, reduce screen reflection and glare, and improve the contrast of the screen, making the displayed content clearer and more vivid. The liquid crystal panel 3 can be an LCD screen of a TV (television), which has relatively low power consumption and greatly reduces supply and cost.

[0088] like Figure 3 As shown, the cover glass 1 is prepared by the following steps:

[0089] (1) Preprocessing steps:

[0090] The soda lime glass is sequentially cleaned with pure water, alkaline and acid.

[0091] (2) Double-sided etching step:

[0092] The pretreated glass is sequentially frosted, rinsed with pure water for the first time after frosting, and rinsed with pure water for the second time after frosting; the frosted glass is polished for the first time, and rinsed with pure water for the first time after polishing; then the glass is polished for the second time, and rinsed with pure water for the second time after polishing; finally, the glass is polished for the third time, and rinsed with pure water for the third time after polishing, and the double-sided etching step is completed at this time.

[0093] The frosting liquid used in the above-mentioned glass frosting includes 48% ammonium fluoride, 8% ammonium sulfate, 13% sulfuric acid, 5% hydrofluoric acid, and 26% water by mass percentage; the frosting treatment temperature is 35° C., and the treatment time is 20 seconds;

[0094] The first polishing liquid used in the first polishing process comprises, by mass percentage, 35% hydrofluoric acid and 65% water; the treatment temperature of the first polishing process is 30° C., and the treatment time is 20 seconds;

[0095] The second polishing liquid used in the second polishing process comprises, by mass percentage, 14% hydrofluoric acid and 86% water; the treatment temperature of the first polishing process is 30° C. and the treatment time is 20 seconds;

[0096] The third polishing liquid used in the third polishing process includes 7% hydrofluoric acid and 93% water by mass percentage; the processing temperature of the third polishing process is 30° C. and the processing time is 20 seconds.

[0097] (3) Post-processing steps:

[0098] The double-sided etched glass is subjected to post-processing alkaline cleaning, post-processing first pure water cleaning, post-processing second pure water cleaning, glass edge grinding, glass tempering, glass printing and cleaning inspection in sequence.

[0099] like Figure 4 As shown, the cover glass 1 prepared in Example 1 includes, in addition to the main body, a front-side etched anti-glare layer 11 and a back-side etched anti-glare layer 12. Figure 5 As shown, Figure 5 (a) is the microstructure of the front-side etched anti-glare layer 11 of the cover glass 1 prepared in Example 1, Figure 5 (b) is the microstructure of the reverse-side etched anti-glare layer 12 of the cover glass 1 prepared in Example 1; scanning electron microscopy (SEM) shows that the cover glass 1 provided in Example 1 forms a uniform and consistent microstructure on both sides of the entire glass cover through the above-mentioned double-sided etching anti-glare treatment, so the overall performance and quality consistency of the product are strong, and the incident light can be effectively scattered, glare can be reduced, and the visual effect of the display module can be improved. In particular, in a bright environment, glare and visual interference caused by light reflection can be reduced.

[0100] Example 2

[0101] Embodiment 2 provides a display module, which differs from Embodiment 1 in that the double-sided etching steps are as follows:

[0102] The pretreated glass is sequentially subjected to glass frosting, first pure water washing after frosting, and second pure water washing after frosting; the frosted glass is subjected to first polishing, and then first pure water washing after polishing; then the glass is subjected to second polishing, and then second pure water washing after polishing, at which point the double-sided etching step is completed; that is, two polishing steps are used for the multi-step polishing step.

[0103] The first polishing liquid used in the first polishing includes 30% hydrofluoric acid and 70% water by mass percentage; the processing temperature of the first polishing is 30° C. and the processing time is 30 seconds;

[0104] The second polishing liquid used in the second polishing includes 10% hydrofluoric acid and 90% water by mass percentage; the processing temperature of the first polishing is 30° C. and the processing time is 30 seconds.

[0105] Example 3

[0106] Embodiment 3 provides a display module, which differs from Embodiment 1 in that the polishing liquid components used in the three polishing processes in the double-sided etching step are all in the same proportion, including 15% hydrofluoric acid and 85% water, in terms of mass percentage.

[0107] Example 4

[0108] Embodiment 4 provides a display module, which differs from Embodiment 1 in that, in the double-sided etching step:

[0109] The first polishing liquid used in the first polishing comprises, by mass percentage, 20% hydrofluoric acid and 80% water;

[0110] The second polishing liquid used in the second polishing comprises, by mass percentage, 15% hydrofluoric acid and 85% water;

[0111] The third polishing liquid used in the third polishing comprises, by mass percentage, 10% hydrofluoric acid and 90% water.

[0112] Example 5

[0113] Embodiment 5 provides a display module, which differs from Embodiment 1 in that, in the double-sided etching step:

[0114] The first polishing liquid used in the first polishing comprises, by mass percentage, 20% hydrofluoric acid and 80% water;

[0115] The second polishing liquid used in the second polishing comprises, by mass percentage, 15% hydrofluoric acid and 85% water;

[0116] The third polishing liquid used in the third polishing comprises 5% hydrofluoric acid and 95% water by mass percentage.

[0117] Example 6

[0118] Embodiment 6 provides a display module, which differs from Embodiment 1 in that, in the double-sided etching step:

[0119] The first polishing liquid used in the first polishing comprises, by mass percentage, 20% hydrofluoric acid and 80% water;

[0120] The second polishing liquid used in the second polishing comprises, by mass percentage, 8% hydrofluoric acid and 91% water;

[0121] The third polishing liquid used in the third polishing comprises, by mass percentage, 4% hydrofluoric acid and 96% water.

[0122] Example 7

[0123] Example 7 provides a display module, which differs from Example 1 in that the frosting liquid used for glass frosting comprises, by mass percentage, 48% ammonium fluoride, 8% ammonium sulfate, 13% sulfuric acid, and 31% water.

[0124] Example 8

[0125] Example 8 provides a display module, which differs from Example 1 in that the frosting liquid used for glass frosting comprises, by mass percentage, 25% ammonium fluoride, 12% ammonium sulfate, 20% sulfuric acid, 13% hydrofluoric acid, and 30% water.

[0126] Comparative Example 1

[0127] Comparative Example 1 provides a display module, which differs from Example 1 in that the double-sided etching step is:

[0128] The pre-treated glass is frosted, washed with pure water for the first time, and washed with pure water for the second time in sequence; the frosted glass is polished, and washed with pure water after polishing. At this time, the double-sided etching step is completed; that is, only one polishing step is used. The polishing liquid used, by mass percentage, includes: 15% hydrofluoric acid, 85% water, the polishing treatment temperature is 30°C, and the treatment time is 60 seconds

[0129] Experimental example

[0130] The performance of the cover glass of the display module provided in Examples 1-8 and Comparative Example 1 was tested. The test results are shown in Table 1.

[0131] Table 1

[0132] Transmittance Haze DOI Glossiness Flash point value Example 1 91.46％ 10 2 8 0.4％ Example 2 90.88％ 8 14 26 2.2％ Example 3 90.58％ 9 15 28 1.6％ Example 4 90.97％ 13 12 12 1.2％ Example 5 91.39％ 11 3 10 0.5％ Example 6 91.02％ 14 7 15 0.9％ Example 7 90.14％ 15 17 28 2.7％ Example 8 89.87％ 14 20 31 2.3％ Comparative Example 1 89.28％ 20 15 20 3.1％

[0133] Among them, the transmittance is measured with a transmission photometer according to ISO 13468 standard; the haze is measured with a spectrophotometer according to ISO 14782 standard; the image clarity (DOI) is measured with a glossmeter according to ASTM D5767 standard; the gloss is measured with a glossmeter according to ISO 2813 standard; the flash point value (Sparkle) is measured with a spectroradiometer to measure the area ratio of visual noise or sparkle on a gray background.

[0134] Compared with Example 3, the hydrofluoric acid content in the polishing liquid used in the multi-pass polishing process decreases with the increase in the number of polishing times, the flash point value of the cover glass is lower, the optical performance is better, and the anti-glare effect and display effect of the display module are better. On this basis, controlling the content of hydrofluoric acid in the polishing liquid can also improve the optical performance of the display module.

[0135] Compared with Example 4, Examples 1 and 5 adjust the hydrofluoric acid content in the polishing liquid used in each polishing step. The hydrofluoric acid content ratio of the three polishing liquids in Example 1 is 5:2:1, the adjusted hydrofluoric acid content ratio of the three polishing liquids in Example 4 is 2:1.5:1, and the adjusted hydrofluoric acid content ratio of the three polishing liquids in Example 5 is 4:3:1. Among them, under the above-mentioned hydrofluoric acid content ratio of Example 4, the cover glass produced cannot achieve the best polishing effect, the flash point value and DOI are higher than those in Example 1 and Example 5, and the anti-glare effect and display effect of the produced display module are affected.

[0136] Compared with Example 1, the adjusted hydrofluoric acid content ratio of the three polishing liquids in Example 6 is 5:2:1, which is consistent with Example 1. However, since the hydrofluoric acid content of the three polishing liquids in Example 6 is lower than that of the corresponding polishing liquids in Example 1, the polishing effect of the cover glass produced in Example 6 is affected, the flash point value and DOI are higher than those in Example 1, and the optical performance and anti-glare effect are not optimal.

[0137] Compared with Example 1, Example 7 and Example 8 adjusted the ratio of the frosting liquid components in Example 7 and Example 8, and hydrofluoric acid was not added to the frosting liquid of Example 7, resulting in a poor etching reaction effect of the frosting liquid of Example 7; the content of ammonium fluoride in the frosting liquid of Example 8 was low, which also resulted in a slow etching reaction of the frosting liquid and poor uniformity of the etched particles. Both Example 7 and Example 8 could not achieve the same etching effect as Example 1, so that the flash point value and DOI of the display modules made in Example 7 and Example 8 were higher than those in Example 1, and the display effect was poor.

[0138] Compared with Comparative Example 1, the flash point values ​​and DOI of Examples 1 and 2 are lower than those of Comparative Example 1, indicating that multiple polishing steps can provide better polishing effects than one polishing step, and can effectively improve the display effect of the display module, and improve the anti-glare effect and optical performance. Compared with Example 1 and Example 2, the flash point value and DOI of Example 1 are lower than those of Example 2, indicating that three polishing steps have better polishing effects than two polishing steps.

[0139] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the claims of the present invention.

Claims

1. A method for manufacturing a cover glass, characterized in that: The method comprises: frosting the glass to be treated to obtain frosted glass including at least one treated surface; The treated surface of the frosted glass is subjected to multiple polishing processes to obtain the cover glass; The cover glass has an average roughness height of 0.1 μm-0.3 μm, an average roughness interval of ≤55 μm, a transmittance of ≥88%, and a haze of 5%-15%.

2. The method according to claim 1, characterized in that The frosting liquid used in the frosting treatment comprises the following components by mass percentage: Ammonium fluoride 40-60%, ammonium sulfate 5-10%, sulfuric acid 10-20%, hydrofluoric acid 5-10%, water 20-40%.

3. The method according to claim 2, characterized in that The average roughness height of the frosted glass surface is 0.4 μm-0.6 μm, the average roughness interval is ≤35 μm, the transmittance is ≥88%, and the haze is 45%-55%; The glossiness of the frosted glass treatment surface is ≤10, the image clarity is ≤2, the flash point value is ≤5%, the total reflection is ≤8%, and the diffuse reflection is ≥5%.

4. The method according to claim 1, characterized in that: The multiple polishing processes include at least three polishing processes, each of which uses a polishing liquid containing hydrofluoric acid; and the content of hydrofluoric acid in the polishing liquid gradually decreases as the number of polishing times increases.

5. The method according to claim 4, characterized in that The multi-pass polishing process includes a first polishing process, a second polishing process and a third polishing process; the mass percentage content of hydrofluoric acid in the first polishing liquid used in the first polishing process is (20-40)%; the mass percentage content of hydrofluoric acid in the second polishing liquid used in the second polishing process is (10-30)%; the mass percentage content of hydrofluoric acid in the third polishing liquid used in the third polishing process is (5-20)%.

6. The method according to claim 4, characterized in that The glossiness of the cover glass is ≤20, the image clarity is ≤5, the flash point value is ≤1%, the total reflection is ≤8%, and the diffuse reflection is ≥2%.

7. The method according to claim 1, characterized in that The frosting treatment has a treatment temperature of 30-40°C and a treatment time of 15-25 seconds; The processing temperature of the multiple polishing processes is 25-35° C., and the processing time of each polishing process is 15-25 seconds.

8. A cover glass, characterized in that: The method is prepared by any one of claims 1 to 7.

9. A display module, characterized in that: The display module comprises the cover glass according to claim 8.

10. Application of the display module according to claim 9 in an LCD liquid crystal display.

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