Thin film transistor liquid crystal display (TFT-LCD) glass surface micro-defect repairing liquid medicine

Abstract

The invention relates to the technical field of TFT-LCD (Thin Film Transistor Liquid Crystal Display) glass, in particular to TFT-LCD glass surface micro-defect repairing liquid medicine which comprises fluosilicate, silicate, a calcium sulfate polymerizing agent and water. According to the invention, a silicate / fluosilicate chemical buffer system is used for pretreatment before thinning of a TFT-LCD (Thin Film Transistor-Liquid Crystal Display), and micro-defects on the surface of the glass are filled, so that the micro-defects on the surface of the glass are eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of TFT-LCD glass, and in particular to a liquid medicine for repairing micro-defects on the surface of TFT-LCD glass. Background Art

[0002] During the production process, TFT-LCD glass has to go through a lot of processes, which will cause a lot of hidden damage on the glass surface, such as scratches, indentations, and pits. During the thinning process of TFT-LCD glass, these defects will be magnified, causing defects on the surface of the TFT-LCD display screen that are visible to the naked eye, which cannot meet product requirements.

[0003] Currently, there are two main methods for reducing micro-defects on thinned TFT-LCD surfaces: First, polishing with a polisher after thinning removes defects; second, pre-treating the glass with a sulfate system before thinning removes most surface micro-defects. Currently, polishing accounts for a higher percentage of treatment, but it requires high fixed asset costs, has low removal efficiency, and can affect the strength of the glass.

[0004] Therefore, brands of TFT-LCD glass products are exploring the use of pre-treatment processes before TFT-LCD thinning. Currently, the market mainly uses a sulfuric acid system pre-treatment process, but this process has high environmental treatment costs, high sulfuric acid risks, and thickness uniformity issues on the product surface after etching. Summary of the Invention

[0005] To address the aforementioned shortcomings of the prior art, the present invention provides a pre-thinning process for TFT-LCD glass. This process effectively reduces most of the hidden defects caused by the pre-fabrication process of TFT-LCD glass, while also being low-cost, environmentally friendly, and low-risk. It also produces excellent glass surface finishes, effectively resolving all the issues with prior treatment methods.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: The invention provides a TFT-LCD glass surface micro-defect repairing solution, which comprises fluorosilicate, silicate, calcium sulfate polymerizer and water.

[0008] Furthermore, based on 100% by weight, it includes Fluorosilicate 20-40%; Silicate 5-8%; Calcium sulfate polymerizer 2-4%; and the balance is water.

[0009] It is understood that in the repair solution for removing micro-defects on the surface of TFT-LCD glass, as some optional examples of the mass percentage of fluorosilicate, the weight percentage of fluorosilicate can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, and ranges between any two of the above values. As some optional examples of the mass percentage of silicate, the weight percentage of silicate can be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, and ranges between any two of the above values. As some optional examples of the mass percentage of the calcium sulfate salt polymerizing agent, the weight percentage of the calcium sulfate salt polymerizing agent can be 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0% and ranges between any two of the above values.

[0010] Preferably, based on 100% of the total weight percentage, the total weight proportion of fluorosilicate, silicate and calcium sulfate salt polymerizer in the repair solution is in the range of 30%-49%; preferably 35%-42%; more preferably 37.3%-40.5%; most preferably 38.9%-40.5%.

[0011] Furthermore, based on 100% by weight, it includes Fluorosilicate 28-32%; Silicate 6-7%; Calcium sulfate polymerizer 2.3-2.5%; and the balance is water.

[0012] Furthermore, the fluorosilicate is one or more of sodium fluorosilicate, potassium fluorosilicate, magnesium fluorosilicate, and aluminum fluorosilicate.

[0013] Furthermore, the silicate is one or more of sodium silicate, potassium silicate, magnesium silicate and aluminum silicate.

[0014] Furthermore, the calcium sulfate salt polymerizing agent is a compound containing calcium sulfate.

[0015] Preferably, the calcium sulfate salt polymerizing agent is calcium sulfate.

[0016] Furthermore, based on 100% of the total weight percentage, it includes 30% of fluorosilicate, 6.5% of silicate, 2.4% of calcium sulfate polymerizer and the balance water.

[0017] A TFT-LCD glass surface micro-defect repairing liquid is used for pre-treatment before thinning of TFT-LCD.

[0018] This invention uses a silicate / fluorosilicate chemical buffer system for pretreatment before thinning TFT-LCDs to fill and eliminate micro-defects on the glass surface. The invention uses fluorosilicate as the entire buffer system, which is similar to the glass itself; silicate as the filling agent; and calcium sulfate as the polymeric filling system.

[0019] When thinning TFT-LCDs, hydrofluoric acid is used to etch and thin the glass. During the hydrofluoric acid etching process, the glass powder generated inside the glass affects the chemical balance of the fluorosilicate / silicate buffer system. The silicate on the surface of the calcium sulfate salt will fill the micro-defects on the glass surface, preventing the hydrofluoric acid from further etching and thinning the interior of the defects. Other unprotected areas are etched normally, thereby suppressing or eliminating micro-damage to the glass surface.

[0020] Beneficial effects

[0021] Compared with the known public technologies, the technical solution provided by the present invention has the following beneficial effects: (1) The present invention has completely transformed and upgraded the pretreatment system of TFT-LCD glass, effectively solving all the problems of all previous treatment methods; no polishing machine investment is required, the treatment cost is low, the environmental protection requirements are not high, and the risk is low; the glass surface effect is good, and in principle it can be used indefinitely based on the existence of filter press equipment.

[0022] (2) In the prior art, the polishing method requires high fixed asset investment, has low removal efficiency, and affects the strength of the glass; the sulfuric acid system pretreatment process has high environmental treatment costs, high sulfuric acid risk, and thickness uniformity problems on the product surface after etching; the method of the present invention does not require the investment of polishing machines, has low processing costs, low environmental protection requirements, and low risk. The glass surface effect is good and, in principle, can be used indefinitely based on the presence of filter press equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following drawings required for use in the embodiments or the description of the prior art are briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0024] Figure 1 It is a structural schematic diagram of the implementation process of the present invention. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] The repair solution of the present invention is used for pre-treatment before thinning of TFT-LCD, specifically as follows Figure 1 As shown, before thinning the TFT-LCD, the TFT-LCD glass is placed in a repair liquid to fill and eliminate micro defects on the glass surface; then the glass is thinned.

[0027] When thinning TFT-LCDs, hydrofluoric acid is used to etch and thin the glass. During the hydrofluoric acid etching process, the glass powder generated inside the glass affects the chemical balance of the fluorosilicate / silicate buffer system. The silicate on the surface of the calcium sulfate salt will fill the micro-defects on the glass surface, preventing the hydrofluoric acid from further etching and thinning the interior of the defects. Other unprotected areas are etched normally, thereby suppressing or eliminating micro-damage to the glass surface.

[0028] The present invention will be further described below with reference to the embodiments.

[0029] (1) Implementation Example 1:

[0030] A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 30% sodium fluorosilicate, 6.5% magnesium silicate, 2.4% calcium sulfate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0031] Example 2:

[0032] A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 28% potassium fluorosilicate, 7% magnesium silicate, 2.3% calcium sulfate, and the balance being water. The potassium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0033] Example 3:

[0034] A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 32% magnesium fluorosilicate, 6% sodium silicate, 2.5% calcium sulfate, and the balance being water. The magnesium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the sodium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0035] Example 4:

[0036] A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 20% aluminum fluorosilicate, 8% magnesium silicate, 2% calcium sulfate, and the balance being water. The aluminum fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0037] Example 5:

[0038] A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 40% sodium fluorosilicate, 5% magnesium silicate, 4% calcium sulfate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0039] Comparative Example 1: A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 15% sodium fluorosilicate, 4% magnesium silicate, 1% calcium sulfate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0040] Comparative Example 2: A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 43% sodium fluorosilicate, 9% magnesium silicate, 5% calcium sulfate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0041] Comparative Example 3: A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 21% sodium fluorosilicate, 5.2% magnesium silicate, 2.1% calcium sulfate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0042] Comparative Example 4: A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 39% sodium fluorosilicate, 7.5% magnesium silicate, 3.8% calcium sulfate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours; the magnesium silicate is then added and aged at 35°C for 24 hours; the calcium sulfate is then added to the solution system, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0043] Comparative Example 5: A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 6.5% magnesium silicate, 2.4% calcium sulfate, and the remainder being water. Magnesium silicate is added to EDI pure water and aged at 35°C for 24 hours. Calcium sulfate is then added to the solution, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0044] Comparative Example 6: A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 30% sodium fluorosilicate, 2.4% calcium sulfate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours. Calcium sulfate is then added to the solution, stirred for 1 hour, and the solution is allowed to become clear and transparent for use.

[0045] Comparative Example 7: A TFT-LCD glass surface micro-defect repair solution comprises, based on 100% total weight percentage, 30% sodium fluorosilicate, 6.5% magnesium silicate, and the balance being water. The sodium fluorosilicate is stirred and dissolved in EDI pure water for 2 hours. The magnesium silicate is then added and aged at 35°C for 24 hours. The solution is then stirred for 1 hour and then clarified and transparent for use.

[0046] (2) Performance testing 1) Test method The glass is high-aluminum glass, and the depth of the scratches and cracks on the glass is less than 0.5mm. When using, several high-aluminum glass sheets are grouped and immersed in the repair solution of the embodiment and comparative example for 15 minutes respectively. After the soaking, they are cleaned with a 5% sodium hydroxide solution at a temperature of 40°C, and then rinsed with pure water.

[0047] 2) Performance test methods or standards The examples and comparative examples were tested by microscope or naked eye, and the inhibition ratio was within the range of 40-50% or greater, which met the requirements.

[0048] 3) Performance test results

[0049] Note: "-" means the indentation is not visible due to the bulge, which is a major defect.

[0050] By comparing the performance test results of the embodiment and the comparative example, it can be seen that the repair solution obtained by compounding sodium fluorosilicate, magnesium silicate and calcium sulfate in the present invention can have a good repair effect on surface defects such as scratches, microcracks and bruises on the surface of TFT-LCD glass. At the same time, when the components contain 28-32% sodium fluorosilicate, 6-7% magnesium silicate and 2.3-2.5% calcium sulfate, the effect is best.

[0051] This invention uses a silicate / fluorosilicate chemical buffer system for pretreatment before thinning TFT-LCDs to fill and eliminate micro-defects on the glass surface. The invention uses fluorosilicate as the entire buffer system, which is similar to the glass itself; silicate as the filling agent; and calcium sulfate as the polymeric filling system.

[0052] When thinning TFT-LCDs, hydrofluoric acid is used to etch and thin the glass. During the hydrofluoric acid etching process, the glass powder generated inside the glass affects the chemical balance of the fluorosilicate / silicate buffer system. The silicate on the surface of the calcium sulfate salt will fill the micro-defects on the glass surface, preventing the hydrofluoric acid from further etching and thinning the interior of the defects. Other unprotected areas are etched normally, thereby suppressing or eliminating micro-damage to the glass surface.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A TFT-LCD glass surface micro-defect repair solution, characterized in that: Based on 100% by weight, it includes Fluorosilicate 20-40%; Silicate 5-8%; Calcium sulfate polymerizer 2-4%; and the balance being water; Based on the total weight percentage of 100%, the total weight of fluorosilicate, silicate and calcium sulfate salt polymerizer in the repair solution accounts for 30%-49%.

2. The TFT-LCD glass surface micro-defect repair solution according to claim 1, characterized in that: Based on 100% by weight, it includes Fluorosilicate 28-32%; Silicate 6-7%; Calcium sulfate polymerizer 2.3-2.5%; and the balance is water.

3. The TFT-LCD glass surface micro-defect repair solution according to claim 1, characterized in that: The fluorosilicate is one or more of sodium fluorosilicate, potassium fluorosilicate, magnesium fluorosilicate and aluminum fluorosilicate.

4. The TFT-LCD glass surface micro-defect repair solution according to claim 1, characterized in that: The silicate is one or more of sodium silicate, potassium silicate, magnesium silicate and aluminum silicate.

5. The TFT-LCD glass surface micro-defect repair solution according to claim 1, characterized in that: The calcium sulfate salt polymerizing agent is a compound containing calcium sulfate.

6. The TFT-LCD glass surface micro-defect repair solution according to claim 1, characterized in that: The calcium sulfate salt polymerizing agent is calcium sulfate.

7. The TFT-LCD glass surface micro-defect repair solution according to claim 1, characterized in that: Based on 100% of the total weight percentage, the composition includes 30% fluorosilicate, 6.5% silicate, 2.4% calcium sulfate polymerizer and the balance water.

8. A TFT-LCD glass surface micro-defect repair solution according to any one of claims 1 to 7, used for pretreatment before thinning of TFT-LCD.

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