Watermark glass sodium ion quantitative analysis method and display screen glass watermark evaluation method

Abstract

The embodiment of the present application relates to the field of display device, and a quick quantitative analysis method of sodium ion of watermark glass of the embodiment of the present application comprises the following steps: measuring a watermark area in the watermark glass; dissolving watermark substances in the watermark glass by using an aqueous solution to obtain a mixed solution, and then performing quantitative analysis on the mixed solution by using a cation column to obtain a sodium ion content; and calculating the sodium ion content per unit watermark area according to the sodium ion content and the watermark area.The display screen glass watermark evaluation method of the embodiment of the present application comprises the following steps: setting a standard value, comparing the measured value with the standard value, and quickly evaluating whether the display screen is defective and the defect degree, so as to guide the improvement of the display screen production process; the quantitative analysis results of the sodium ion of the watermark glass before and after the improvement can be compared to quickly identify the effectiveness of the solution of the watermark problem; and the method can also be used for the daily production of the display screen glass to quickly evaluate whether the product quality is qualified.

Description

Technical Field

[0001] This invention relates to the field of display device technology, and in particular to a method for quantitative analysis of sodium ions in watermarked glass and a method for evaluating watermarks on display glass. Background Technology

[0002] Commercial large-screen displays and smart screens currently primarily use soda-lime glass, with lamination methods including open-pore lamination, partial lamination, and full lamination. Due to the higher cost of full lamination, open-pore and partial lamination are currently the main methods, resulting in one side of the soda-lime glass in these products being exposed to air. Based on the characteristics of soda-lime glass, its high sodium content causes sodium ions to migrate to the glass surface and react with carbon dioxide, water vapor, and other substances in the air to form sodium salts that adhere to the glass surface, leading to various watermark defects. Currently, the industry lacks methods to guide the improvement of watermark defects in display screens and cannot verify the effectiveness of watermark problem solutions. Summary of the Invention

[0003] Based on this, the purpose of this invention is to provide a quantitative analysis method for sodium ions in watermarked glass, which can provide guidance for the assessment of watermark defects in display screens and the improvement of display screen manufacturing processes. It can also compare the quantitative analysis results before and after improvement to identify the effectiveness of watermark problem resolution.

[0004] In a first aspect, the watermarked glass sodium ion quantitative analysis method according to the embodiments of the present invention includes the following steps:

[0005] Prepare a watermarked glass and measure the area of ​​the watermark within it;

[0006] The watermark glass is placed in a container, and an aqueous solution is added to the container so that the watermark glass is submerged in the aqueous solution.

[0007] The watermark material of the watermark glass is separated and dissolved in the aqueous solution to form a mixture;

[0008] The sodium ion content was obtained by quantitative analysis of the mixture.

[0009] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0010] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed to determine the sodium ion content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions in the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0011] As a preferred embodiment, the solute in the aqueous solution described in this invention is an alcohol. Alcohols, due to their hydroxyl groups, readily combine with sodium ions, thus accelerating the dissolution of sodium salts. Isopropanol is preferably used, as it provides the best dissolution effect for sodium salts.

[0012] As a preferred embodiment, the solute in the aqueous solution of the present invention has a mass fraction of 8%-12%, more preferably 10%. A mass fraction of 8%-12% can dissolve sodium salts most efficiently. If the mass fraction is too low, the dissolution time will be longer, and if the mass fraction is too high, the cost will increase.

[0013] As a preferred embodiment, the method for separating the watermark substance from the watermark glass according to this invention includes placing the container in a constant-temperature shaking device for shaking treatment. Shaking treatment allows the aqueous solution to fully contact the watermark glass, ensuring the sodium salt is fully dissolved in the aqueous solution and reducing the dissolution time. In other embodiments, the watermark substance from the watermark glass can also be separated by ultrasonic methods or magnetic stirring.

[0014] As a preferred embodiment, the method for separating the watermark material from the watermark glass according to this invention further includes heating in the constant temperature oscillation device at a temperature of 60℃-100℃ for 1-2 hours. This temperature and time maximize the extraction of sodium ions; excessively long heating times increase costs.

[0015] As a preferred embodiment, the mixture described in this invention is filtered using a filter membrane. By filtering out larger diameter particles, clogging of the analytical equipment is avoided during subsequent quantitative analysis.

[0016] As a preferred embodiment, the filter membrane described in this invention has a pore size of no more than 0.4 μm. The particles in the filtrate after filtration by a filter membrane with this pore size are smaller, which facilitates subsequent quantitative analysis.

[0017] As a preferred embodiment, the container described in this invention is a sealed container. Since aqueous solutions are volatile, a sealed container can prevent solution loss and ensure the accuracy of the test results; at the same time, a sealed container can prevent solution splashing during subsequent operations, ensuring the accuracy of the test results.

[0018] As a preferred embodiment, when the watermarked glass is placed in the container, the watermark side faces upwards and is placed parallel to the bottom of the container. Since the watermark is only on one side of the watermarked glass, it needs to be placed with the watermarked side facing upwards to facilitate the dissolution of the sodium salt; placing the watermarked glass parallel to the bottom of the container can prevent the glass from breaking during subsequent operations.

[0019] Secondly, the display screen glass watermark evaluation method described in the embodiments of the present invention includes the following steps:

[0020] The sodium ion content per unit watermark area is calculated from the sodium ion content and the watermark area and used as the measured value.

[0021] Set a standard value, which is the maximum allowable sodium ion content per unit watermark area of ​​the display glass;

[0022] The measured value is compared with the standard value. If the measured value is higher than the standard value, it is judged as unqualified; if the measured value is not higher than the standard value, it is judged as qualified.

[0023] This invention compares the sodium ion content data per unit watermark area obtained from the analysis with standard data, which can quickly assess whether the watermark on the display glass is defective and the degree of defect, so as to guide the improvement of the display manufacturing process. For different watermarked glasses, the larger the measured value, the more serious the watermark defect. It can also compare the quantitative analysis results of sodium ions in the watermarked glass before and after the improvement to quickly identify the effectiveness of the watermark problem solution. At the same time, this method can also be used in the daily production of display glass to quickly assess whether the product quality is qualified. Detailed Implementation

[0024] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0025] Prepare a watermarked glass and measure the area of ​​the watermark within it;

[0026] Prepare a container that can hold the watermark glass, place the watermark glass in the container, and add an aqueous solution to the container so that the watermark glass is submerged in the aqueous solution;

[0027] The watermark material of the watermark glass is separated and dissolved in the aqueous solution to form a mixture;

[0028] The watermarked glass was removed from the container, and the mixture was filtered and quantitatively analyzed to obtain the sodium ion content.

[0029] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0030] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then filtered, and the sodium ion content is quantitatively analyzed. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions in the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0031] The watermark evaluation method for display screen glass according to an embodiment of the present invention includes the following steps:

[0032] The sodium ion content per unit watermark area is calculated from the sodium ion content and the watermark area and used as the measured value.

[0033] Set a standard value, which is the maximum allowable sodium ion content per unit watermark area of ​​the display glass;

[0034] The measured value is compared with the standard value. If the measured value is higher than the standard value, it is judged as unqualified; if the measured value is not higher than the standard value, it is judged as qualified.

[0035] This invention compares the sodium ion content data per unit watermark area obtained from the analysis with standard data, which can quickly assess whether the watermark on the display glass is defective and the degree of defect, so as to guide the improvement of the display manufacturing process. For different watermarked glasses, the larger the measured value, the more serious the watermark defect. It can also compare the quantitative analysis results of sodium ions in the watermarked glass before and after the improvement to quickly identify the effectiveness of the watermark problem solution. At the same time, this method can also be used in the daily production of display glass to quickly assess whether the product quality is qualified.

[0036] Example 1

[0037] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0038] Prepare a 21.5-inch piece of watermarked glass and measure the area of ​​the watermark within it;

[0039] Prepare a container that contains no metal elements, is insoluble in isopropanol aqueous solution, and is heat-resistant above 80°C. The container should be large enough to hold the watermarked glass. Place the watermarked glass in the container with the watermarked side facing up and parallel to the bottom of the container. Add an isopropanol aqueous solution to the container, with an isopropanol mass fraction of 9.5%-10%. Immerse the watermarked glass in the isopropanol aqueous solution.

[0040] Prepare a constant temperature shaking device, put the container into the constant temperature shaking device, heat it in a water bath at 75℃-80℃ for 1 hour to dissolve the sodium salt in the watermark glass and form a mixture;

[0041] Remove the watermark glass from the container and filter the mixture in the container using a filter membrane with a pore size of less than 0.4 μm;

[0042] The filtered mixture was quantitatively analyzed using a Dionex IC cation exchange column to obtain the sodium ion content;

[0043] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0044] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed using a cation exchange column, which can efficiently and rapidly separate sodium ions and analyze their content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions on the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0045] Specifically, the Dionex IC cation column is model CS12A.

[0046] Example 2

[0047] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0048] Prepare a 20-inch watermark glass and measure the area of ​​the watermark within it;

[0049] Prepare a container that contains no metal elements, is insoluble in isopropanol aqueous solution, and is heat-resistant to above 100°C. The container should be large enough to hold the watermarked glass. Place the watermarked glass in the container with the watermarked side facing up and parallel to the bottom of the container. Add an isopropanol aqueous solution to the container, with an isopropanol mass fraction of 8%-8.5%. Immerse the watermarked glass in the isopropanol aqueous solution.

[0050] Prepare a constant temperature shaking device, put the container into the constant temperature shaking device, heat it in a 95℃-100℃ water bath for 1 hour to dissolve the sodium salt in the watermark glass and form a mixture;

[0051] Remove the watermark glass from the container and filter the mixture in the container using a filter membrane with a pore size of less than 0.4 μm;

[0052] The filtered mixture was quantitatively analyzed using a Dionex IC cation exchange column to obtain the sodium ion content;

[0053] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0054] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed using a cation exchange column, which can efficiently and rapidly separate sodium ions and analyze their content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions on the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0055] Example 3

[0056] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0057] Prepare a 15-inch watermark glass and measure the area of ​​the watermark within it;

[0058] Prepare a container that contains no metal elements, is insoluble in isopropanol aqueous solution, and is heat-resistant to above 65°C. The container should be large enough to hold the watermarked glass. Place the watermarked glass in the container with the watermarked side facing up and parallel to the bottom of the container. Add an isopropanol aqueous solution to the container, with an isopropanol mass fraction of 11.5%-12%. Immerse the watermarked glass in the isopropanol aqueous solution.

[0059] Prepare a constant temperature shaking device, put the container into the constant temperature shaking device, heat it in a water bath at 60℃-65℃ for 1 hour, and sonicate it at the same time to dissolve the sodium salt in the watermark glass to form a mixture.

[0060] Remove the watermark glass from the container and filter the mixture in the container using a filter membrane with a pore size of less than 0.4 μm;

[0061] The filtered mixture was quantitatively analyzed using a Dionex IC cation exchange column to obtain the sodium ion content;

[0062] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0063] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed using a cation exchange column, which can efficiently and rapidly separate sodium ions and analyze their content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions on the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0064] Example 4

[0065] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0066] Prepare a 20-inch watermark glass and measure the area of ​​the watermark within it;

[0067] Prepare a container that contains no metal elements, is insoluble in n-propanol aqueous solution, and is heat-resistant above 70°C. The container should be large enough to hold the watermarked glass. Place the watermarked glass in the container with the watermarked side facing up and parallel to the bottom of the container. Add an n-propanol aqueous solution to the container, with a mass fraction of 10%-10.5%. Immerse the watermarked glass in the n-propanol aqueous solution.

[0068] Prepare a constant temperature shaking device, put the container into the constant temperature shaking device, heat it in a water bath at 65℃-70℃ for 1 hour to dissolve the sodium salt in the watermark glass and form a mixture;

[0069] Remove the watermark glass from the container and filter the mixture in the container using a filter membrane with a pore size of less than 0.4 μm;

[0070] The filtered mixture was quantitatively analyzed using a Dionex IC cation exchange column to obtain the sodium ion content;

[0071] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0072] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed using a cation exchange column, which can efficiently and rapidly separate sodium ions and analyze their content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions on the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0073] Example 5

[0074] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0075] Prepare a 22-inch watermark glass and measure the area of ​​the watermark within it;

[0076] Prepare a container that contains no metal elements, is insoluble in ethanol aqueous solution, and is heat-resistant to above 95°C. The container should be large enough to hold the watermarked glass. Place the watermarked glass in the container with the watermarked side facing up and parallel to the bottom of the container. Add an ethanol aqueous solution to the container, with an ethanol mass fraction of 10.5%-11.5%. The ethanol aqueous solution should completely submerge the watermarked glass.

[0077] Prepare a constant temperature shaking device, put the container into the constant temperature shaking device, heat it in a water bath at 85℃-95℃ for 1 hour to dissolve the sodium salt in the watermark glass and form a mixture;

[0078] Remove the watermark glass from the container and filter the mixture in the container using a filter membrane with a pore size of less than 0.4 μm;

[0079] The filtered mixture was quantitatively analyzed using a Dionex IC cation exchange column to obtain the sodium ion content;

[0080] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0081] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed using a cation exchange column, which can efficiently and rapidly separate sodium ions and analyze their content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions on the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0082] Example 6

[0083] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0084] Prepare an 18-inch watermark glass and measure the area of ​​the watermark within it;

[0085] Prepare a container that contains no metal elements, is insoluble in isopropanol aqueous solution, and is heat-resistant to above 75°C. The container should be large enough to hold the watermarked glass. Place the watermarked glass in the container with the watermarked side facing up and parallel to the bottom of the container. Add an isopropanol aqueous solution to the container, with an isopropanol mass fraction of 8.5%-9%. Immerse the watermarked glass in the isopropanol aqueous solution.

[0086] Prepare a constant temperature shaking device, put the container into the constant temperature shaking device, heat it in a water bath at 70℃-75℃ for 2 hours to dissolve the sodium salt in the watermark glass and form a mixture;

[0087] Remove the watermark glass from the container and filter the mixture in the container using a filter membrane with a pore size of less than 0.4 μm;

[0088] The filtered mixture was quantitatively analyzed using a Dionex IC cation exchange column to obtain the sodium ion content;

[0089] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0090] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed using a cation exchange column, which can efficiently and rapidly separate sodium ions and analyze their content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions on the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0091] Example 7

[0092] The method for quantitative analysis of sodium ions in watermarked glass according to embodiments of the present invention includes the following steps:

[0093] Prepare a 10-inch watermark glass and measure the area of ​​the watermark within it;

[0094] Prepare a container that contains no metal elements, is insoluble in isopropanol aqueous solution, and is heat-resistant to above 85°C. The container should be large enough to hold the watermarked glass. Place the watermarked glass in the container with the watermarked side facing up and parallel to the bottom of the container. Add an isopropanol aqueous solution to the container, with an isopropanol mass fraction of 9%-9.5%. Immerse the watermarked glass in the isopropanol aqueous solution.

[0095] Prepare a constant temperature shaking device, place the container in the constant temperature shaking device, and heat it in a water bath at 80℃-85℃ for 1.5 hours to dissolve the sodium salt in the watermark glass and form a mixture.

[0096] Remove the watermark glass from the container and filter the mixture in the container using a filter membrane with a pore size of less than 0.4 μm;

[0097] The filtered mixture was quantitatively analyzed using a Dionex IC cation exchange column to obtain the sodium ion content;

[0098] The sodium ion content per unit watermark area is calculated based on the sodium ion content and the watermark area.

[0099] This invention dissolves sodium salts on watermarked glass in an aqueous solution, where the sodium salts exist as sodium ions in the aqueous solution to form a mixture. The mixture is then quantitatively analyzed using a cation exchange column, which can efficiently and rapidly separate sodium ions and analyze their content. Based on the obtained sodium ion content and the measured watermark area, the sodium ion content per unit watermark area can be calculated. Comparing the analyzed sodium ion content measurement data with standard data allows for a rapid assessment of the watermark's quality and severity, guiding improvements in the display manufacturing process. Furthermore, comparing the quantitative analysis results of sodium ions on the watermarked glass before and after improvements allows for rapid identification of the effectiveness of the watermark problem resolution.

[0100] Example 8

[0101] The watermark evaluation method for display screen glass according to an embodiment of the present invention includes the following steps:

[0102] The sodium ion content per unit watermark area was obtained as a measured value according to the quantitative analysis method of sodium ion in watermark glass described in any of Examples 1 to 7.

[0103] Set a standard value, which is the maximum allowable sodium ion content per unit watermark area of ​​the display glass;

[0104] The measured value is compared with the standard value. If the measured value is higher than the standard value, it is judged as unqualified; if the measured value is not higher than the standard value, it is judged as qualified.

[0105] This invention compares the sodium ion content data per unit watermark area obtained from the analysis with standard data, which can quickly assess whether the watermark on the display glass is defective and the degree of defect, so as to guide the improvement of the display manufacturing process. For different watermarked glasses, the larger the measured value, the more serious the watermark defect. It can also compare the quantitative analysis results of sodium ions in the watermarked glass before and after the improvement to quickly identify the effectiveness of the watermark problem solution. At the same time, this method can also be used in the daily production of display glass to quickly assess whether the product quality is qualified.

[0106] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for quantitative analysis of sodium ions in watermarked glass, characterized by, The method comprises the following steps: preparing a watermarked glass and measuring the area of the watermarks on the glass; placing the watermarked glass in a container, adding an aqueous solution into the container so that the watermarked glass is immersed in the aqueous solution, and the solute in the aqueous solution is an alcohol; separating the watermarked substance on the watermarked glass and dissolving the watermarked substance in the aqueous solution to form a mixed solution; performing quantitative analysis on the mixed solution to obtain the content of sodium ions; calculating the content of sodium ions per unit area of the watermarks according to the content of sodium ions and the area of the watermarks.

2. The method according to claim 1, wherein, The aqueous solution is an isopropyl alcohol solution with a mass fraction of 8%-12%.

3. The method of claim 1, wherein the sodium ion is quantitatively analyzed. The method for separating the watermarked substance on the watermarked glass comprises placing the container in a constant-temperature shaking device for shaking treatment.

4. The method according to claim 3, wherein, The method for separating the watermarked substance on the watermarked glass further comprises heating in the constant-temperature shaking device, and the heating temperature is 60-100℃ and the heating time is 1-2 hours.

5. The method of claim 1, wherein the water glass is Na2O. The mixed solution is filtered by using a filter membrane before the quantitative analysis.

6. The method of claim 5, wherein the sodium ion is quantitatively analyzed. The pore size of the filter membrane is not greater than 0.4μm.

7. The method of claim 1, wherein the water glass is Na2O. The container is a sealed container.

8. The method of claim 1, wherein the sodium ion is quantitatively analyzed. When the watermarked glass is placed in the container, the watermarked side faces upward and is parallel to the bottom of the container.

9. A method for evaluating watermarks on display glass, characterized in that, The method comprises the following steps: The content of sodium ions per unit area of the watermarks obtained by the method for quantitative analysis of sodium ions in a watermarked glass according to any one of claims 1-8 is taken as a measured value; a standard value is set, and the standard value is the maximum allowable value of the content of sodium ions per unit area of the watermarks of a display screen glass; the measured value is compared with the standard value, if the measured value is higher than the standard value, it is determined as unqualified, and if the measured value is not higher than the standard value, it is determined as qualified.