CN111423129A - Comprehensive thinning treatment process for liquid crystal display screen - Google Patents
Comprehensive thinning treatment process for liquid crystal display screen Download PDFInfo
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- CN111423129A CN111423129A CN202010354448.9A CN202010354448A CN111423129A CN 111423129 A CN111423129 A CN 111423129A CN 202010354448 A CN202010354448 A CN 202010354448A CN 111423129 A CN111423129 A CN 111423129A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
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Abstract
The invention discloses a comprehensive thinning treatment process for a liquid crystal display screen, which comprises the following steps of: the method comprises the following steps of firstly, sealing glue protection, secondly, liquid crystal display screen pretreatment, thirdly, defect treatment and polishing, fourthly, etching liquid preparation, fifthly, etching pretreatment, sixthly, etching treatment, and seventhly, etching post-treatment; the invention can slightly enlarge the defects on the surface of the liquid crystal display screen through pretreatment before etching, polish and polish the defects on the surface of the liquid crystal display screen through defect polishing treatment to enable the surface to be smooth and bright, enable crystals generated after hydrofluoric acid and glass react to have a temporary attached chemical phenomenon through the chemical characteristics of hydrochloric acid, and precisely control the thickness of the liquid crystal display screen according to requirements through the matching use of nitric acid and hydrochloric acid, and prevent the phenomenon of uneven etching by impacting and dropping the temporarily attached crystals through bubbling generated by a defense corrosion gas pipe at the bottom of an etching tank.
Description
Technical Field
The invention relates to the technical field of liquid crystal display screen production, in particular to a comprehensive thinning treatment process for a liquid crystal display screen.
Background
Along with the scientific development, the competition of the liquid crystal display screen industry is more and more intense, wherein the concentration points of the competition lie in the high resolution, ultrathin and high brightness design and low power consumption of the liquid crystal display screen, the ultrathin display technology has become a mainstream trend of the market, at present, two thinning methods of the liquid crystal display screen are adopted, one is a physical polishing and grinding method, the other is a chemical etching and thinning method, and the chemical etching and thinning method is widely applied by the specific advantages;
the surface of the liquid crystal display screen has some defects during production, and under the chemical etching uniform thinning method, some defect points on the thinned liquid crystal display screen can be amplified to cause the quality problem of the liquid crystal display screen, and meanwhile, the solubility of salts generated by chemical reaction is different, and crystals generated after the reaction are attached to the surface of glass to prevent further reaction of hydrofluoric acid and the glass, so that the etching effect is not uniform.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a comprehensive thinning treatment process for the liquid crystal display screen, the comprehensive thinning treatment process for the liquid crystal display screen can slightly enlarge the defects on the surface of the liquid crystal display screen through pretreatment before etching, is convenient for observation and treatment, and polishes the defects on the surface of the liquid crystal display screen through defect polishing treatment to ensure that the surface of the liquid crystal display screen is flat and bright; the chemical property of the hydrochloric acid enables crystals generated after the hydrofluoric acid and the glass react to have a temporary attachment chemical phenomenon, and the thickness of the liquid crystal display screen can be accurately controlled according to the requirement through the matching use of the nitric acid and the hydrochloric acid; the bubbling generated by the corrosion prevention air pipe at the bottom of the etching tank can impact and drop the temporarily attached crystal, so that the phenomenon of uneven etching is avoided.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a comprehensive thinning treatment process for a liquid crystal display screen comprises the following steps:
the method comprises the following steps: sealing glue for protection, coating a layer of frame glue on the side edge of the liquid crystal display screen, then placing the liquid crystal display screen in an oven, drying for 10-15 minutes at the temperature of 170 ℃ to solidify the frame glue to prevent etching liquid from permeating into the liquid crystal display screen, then coating photoresist on the electrode end of the liquid crystal display screen, placing the liquid crystal display screen in the oven, drying for 5-15 minutes at the temperature of 70 ℃ to solidify the photoresist, and preventing the etching liquid from corroding a lead electrode;
step two: pretreating the liquid crystal display screen, namely preparing mixed liquid from 40% hydrofluoric acid, 50% hydrochloric acid and purified water, and putting the liquid crystal display screen into a tank containing the mixed liquid for soaking for 10-15 minutes to pretreat, so that the defects on the surface of the liquid crystal display screen are slightly enlarged, and the liquid crystal display screen is convenient to observe and treat;
step three: polishing the defects, namely placing the liquid crystal display screen which is pretreated and has the defects on a workbench of a polishing machine, positioning the liquid crystal display screen by using an optical leveling instrument, fixing the peripheral edge of the liquid crystal display screen by using a clamp, uniformly coating polishing liquid on the surface of the liquid crystal display screen, standing for 30 seconds, starting the polishing machine to polish the two sides of the liquid crystal display screen, and enabling the surface of the liquid crystal display screen to be flat and bright;
step four: preparing an etching solution, namely mixing 40% hydrofluoric acid, 70% nitric acid, 50% hydrochloric acid and purified water, and dropwise adding a phosphate buffer solution to adjust the HP value of the etching solution to 8-10 to prepare the etching solution for later use;
step five: performing etching pretreatment, cleaning the two sides of the liquid crystal display screen by using acetone and ethanol in sequence to ensure that dust, oil stains and the like do not adhere to the two sides of the liquid crystal display screen, washing the liquid crystal display screen by using deionized water, soaking for 10-15 minutes, and taking out and wiping;
step six: etching treatment, namely etching by adopting a multi-piece vertical soaking method, vertically placing a plurality of liquid crystal display screens into a specially-made frame body, adding etching liquid into a tank, and placing the frame body loaded with the plurality of liquid crystal display screens into the tank for soaking and etching;
step seven: and (3) carrying out etching post-treatment, cleaning the outer surface of the display screen by using acetone and ethanol again to ensure that dust, oil stains and the like are not attached to the display screen, washing the glass substrate by using deionized water again, soaking for 10-15 minutes, taking out and drying to obtain the thinned liquid crystal display screen.
The further improvement lies in that: and D, mixing the hydrofluoric acid, the hydrochloric acid and the purified water in the mixed liquid prepared in the step two according to a mixing ratio of 2:2:1, wherein the liquid level of the mixed liquid completely submerges the display screen.
The further improvement is that the mixing ratio of the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in the fourth step is 2:1:2:1, the mixing method is to add and fully stir the materials in sequence, and the phosphate buffer solution is prepared by adding water into 250ml of 0.2 mol/L potassium dihydrogen phosphate solution and 118ml of 0.2 mol/L sodium hydroxide solution to dilute the materials to 1000 ml.
The further improvement lies in that: and in the sixth etching treatment, the soaking etching waiting time is controlled to be 5-20 minutes according to the polishing degree of the defect treatment of the liquid crystal display screen in the third step, and an anti-corrosion air pipe is additionally arranged at the bottom of the tank in the sixth step so as to generate bubbling.
The further improvement lies in that: and the drying condition in the seventh step is to bake for 15-20 minutes at 150 ℃.
The invention has the beneficial effects that: the invention can slightly enlarge the defects on the surface of the liquid crystal display screen through pretreatment before etching, is convenient for observation and treatment, and polishes the defects on the surface of the liquid crystal display screen through defect polishing treatment to ensure that the surface is smooth and bright;
the chemical property of the hydrochloric acid enables crystals generated after the hydrofluoric acid and the glass react to have a temporary attachment chemical phenomenon, and the thickness of the liquid crystal display screen can be accurately controlled according to the requirement through the matching use of the nitric acid and the hydrochloric acid;
the bubbling generated by the corrosion prevention air pipe at the bottom of the etching tank can impact and drop the temporarily attached crystal, so that the phenomenon of uneven etching is avoided.
Drawings
FIG. 1 is a flow chart of the thinning process of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example 1
According to fig. 1, the embodiment provides a comprehensive thinning process for a liquid crystal display panel, which includes the following steps:
the method comprises the following steps: sealing glue for protection, coating a layer of frame glue on the side edge of the liquid crystal display screen, then placing the liquid crystal display screen in an oven, drying for 10-15 minutes at the temperature of 170 ℃ to solidify the frame glue to prevent etching liquid from permeating into the liquid crystal display screen, then coating photoresist on the electrode end of the liquid crystal display screen, placing the liquid crystal display screen in the oven, drying for 5-15 minutes at the temperature of 70 ℃ to solidify the photoresist, and preventing the etching liquid from corroding a lead electrode;
step two: pretreating the liquid crystal display screen, namely preparing mixed liquid from 40% hydrofluoric acid, 50% hydrochloric acid and purified water, and putting the liquid crystal display screen into a tank containing the mixed liquid for soaking for 10-15 minutes to pretreat, so that the defects on the surface of the liquid crystal display screen are slightly enlarged, and the liquid crystal display screen is convenient to observe and treat;
step three: polishing the defects, namely placing the liquid crystal display screen which is pretreated and has the defects on a workbench of a polishing machine, positioning the liquid crystal display screen by using an optical leveling instrument, fixing the peripheral edge of the liquid crystal display screen by using a clamp, uniformly coating polishing liquid on the surface of the liquid crystal display screen, standing for 30 seconds, starting the polishing machine to polish the two sides of the liquid crystal display screen, and enabling the surface of the liquid crystal display screen to be flat and bright;
step four: preparing an etching solution, namely mixing 40% hydrofluoric acid, 70% nitric acid, 50% hydrochloric acid and purified water, and dropwise adding a phosphate buffer solution to adjust the HP value of the etching solution to 8-10 to prepare the etching solution for later use;
step five: performing etching pretreatment, cleaning the two sides of the liquid crystal display screen by using acetone and ethanol in sequence to ensure that dust, oil stains and the like do not adhere to the two sides of the liquid crystal display screen, washing the liquid crystal display screen by using deionized water, soaking for 10-15 minutes, and taking out and wiping;
step six: etching treatment, namely etching by adopting a multi-piece vertical soaking method, vertically placing a plurality of liquid crystal display screens into a specially-made frame body, adding etching liquid into a tank, and placing the frame body loaded with the plurality of liquid crystal display screens into the tank for soaking and etching;
step seven: and (3) carrying out etching post-treatment, cleaning the outer surface of the display screen by using acetone and ethanol again to ensure that dust, oil stains and the like are not attached to the display screen, washing the glass substrate by using deionized water again, soaking for 10-15 minutes, taking out and drying to obtain the thinned liquid crystal display screen.
And D, mixing the hydrofluoric acid, the hydrochloric acid and the purified water in the mixed liquid prepared in the step two according to a mixing ratio of 2:2:1, wherein the liquid level of the mixed liquid completely submerges the display screen.
And the mixing ratio of the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in the fourth step is 2:1:2:1, the mixing method comprises the steps of adding and fully stirring the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in sequence, and the phosphate buffer solution is prepared by adding water into 250ml of 0.2 mol/L potassium dihydrogen phosphate solution and 118ml of 0.2 mol/L sodium hydroxide solution and diluting the mixture to 1000 ml.
And controlling the soaking and etching waiting time of the liquid crystal display screen which is not subjected to polishing treatment without defects in the etching treatment in the sixth step to be 15-20 minutes, additionally arranging an anti-corrosion air pipe at the bottom of the tank in the sixth step to generate bubbles, and baking the liquid crystal display screen in the seventh step for 15-20 minutes at the temperature of 150 ℃.
Example 2
According to fig. 1, the embodiment provides a comprehensive thinning process for a liquid crystal display panel, which includes the following steps:
the method comprises the following steps: sealing glue for protection, coating a layer of frame glue on the side edge of the liquid crystal display screen, then placing the liquid crystal display screen in an oven, drying for 10-15 minutes at the temperature of 170 ℃ to solidify the frame glue to prevent etching liquid from permeating into the liquid crystal display screen, then coating photoresist on the electrode end of the liquid crystal display screen, placing the liquid crystal display screen in the oven, drying for 5-15 minutes at the temperature of 70 ℃ to solidify the photoresist, and preventing the etching liquid from corroding a lead electrode;
step two: pretreating the liquid crystal display screen, namely preparing mixed liquid from 40% hydrofluoric acid, 50% hydrochloric acid and purified water, and putting the liquid crystal display screen into a tank containing the mixed liquid for soaking for 10-15 minutes to pretreat, so that the defects on the surface of the liquid crystal display screen are slightly enlarged, and the liquid crystal display screen is convenient to observe and treat;
step three: polishing the defects, namely placing the liquid crystal display screen which is pretreated and has the defects on a workbench of a polishing machine, positioning the liquid crystal display screen by using an optical leveling instrument, fixing the peripheral edge of the liquid crystal display screen by using a clamp, uniformly coating polishing liquid on the surface of the liquid crystal display screen, standing for 30 seconds, starting the polishing machine to polish the two sides of the liquid crystal display screen, and enabling the surface of the liquid crystal display screen to be flat and bright;
step four: preparing an etching solution, namely mixing 40% hydrofluoric acid, 70% nitric acid, 50% hydrochloric acid and purified water, and dropwise adding a phosphate buffer solution to adjust the HP value of the etching solution to 8-10 to prepare the etching solution for later use;
step five: performing etching pretreatment, cleaning the two sides of the liquid crystal display screen by using acetone and ethanol in sequence to ensure that dust, oil stains and the like do not adhere to the two sides of the liquid crystal display screen, washing the liquid crystal display screen by using deionized water, soaking for 10-15 minutes, and taking out and wiping;
step six: etching treatment, namely etching by adopting a multi-piece vertical soaking method, vertically placing a plurality of liquid crystal display screens into a specially-made frame body, adding etching liquid into a tank, and placing the frame body loaded with the plurality of liquid crystal display screens into the tank for soaking and etching;
step seven: and (3) carrying out etching post-treatment, cleaning the outer surface of the display screen by using acetone and ethanol again to ensure that dust, oil stains and the like are not attached to the display screen, washing the glass substrate by using deionized water again, soaking for 10-15 minutes, taking out and drying to obtain the thinned liquid crystal display screen.
And D, mixing the hydrofluoric acid, the hydrochloric acid and the purified water in the mixed liquid prepared in the step two according to a mixing ratio of 2:2:1, wherein the liquid level of the mixed liquid completely submerges the display screen.
And the mixing ratio of the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in the fourth step is 2:1:2:1, the mixing method comprises the steps of adding and fully stirring the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in sequence, and the phosphate buffer solution is prepared by adding water into 250ml of 0.2 mol/L potassium dihydrogen phosphate solution and 118ml of 0.2 mol/L sodium hydroxide solution and diluting the mixture to 1000 ml.
And the liquid crystal display screen which has slight defects in the etching treatment in the sixth step and is subjected to slight polishing treatment controls the soaking etching waiting time to be 10-15 minutes, an anti-corrosion air pipe is additionally arranged at the bottom of the tank in the sixth step so as to generate bubbles, and the drying condition in the seventh step is that the baking is carried out for 15-20 minutes in the environment of 150 ℃.
Example 3
According to fig. 1, the embodiment provides a comprehensive thinning process for a liquid crystal display panel, which includes the following steps:
the method comprises the following steps: sealing glue for protection, coating a layer of frame glue on the side edge of the liquid crystal display screen, then placing the liquid crystal display screen in an oven, drying for 10-15 minutes at the temperature of 170 ℃ to solidify the frame glue to prevent etching liquid from permeating into the liquid crystal display screen, then coating photoresist on the electrode end of the liquid crystal display screen, placing the liquid crystal display screen in the oven, drying for 5-15 minutes at the temperature of 70 ℃ to solidify the photoresist, and preventing the etching liquid from corroding a lead electrode;
step two: pretreating the liquid crystal display screen, namely preparing mixed liquid from 40% hydrofluoric acid, 50% hydrochloric acid and purified water, and putting the liquid crystal display screen into a tank containing the mixed liquid for soaking for 10-15 minutes to pretreat, so that the defects on the surface of the liquid crystal display screen are slightly enlarged, and the liquid crystal display screen is convenient to observe and treat;
step three: polishing the defects, namely placing the liquid crystal display screen which is pretreated and has the defects on a workbench of a polishing machine, positioning the liquid crystal display screen by using an optical leveling instrument, fixing the peripheral edge of the liquid crystal display screen by using a clamp, uniformly coating polishing liquid on the surface of the liquid crystal display screen, standing for 30 seconds, starting the polishing machine to polish the two sides of the liquid crystal display screen, and enabling the surface of the liquid crystal display screen to be flat and bright;
step four: preparing an etching solution, namely mixing 40% hydrofluoric acid, 70% nitric acid, 50% hydrochloric acid and purified water, and dropwise adding a phosphate buffer solution to adjust the HP value of the etching solution to 8-10 to prepare the etching solution for later use;
step five: performing etching pretreatment, cleaning the two sides of the liquid crystal display screen by using acetone and ethanol in sequence to ensure that dust, oil stains and the like do not adhere to the two sides of the liquid crystal display screen, washing the liquid crystal display screen by using deionized water, soaking for 10-15 minutes, and taking out and wiping;
step six: etching treatment, namely etching by adopting a multi-piece vertical soaking method, vertically placing a plurality of liquid crystal display screens into a specially-made frame body, adding etching liquid into a tank, and placing the frame body loaded with the plurality of liquid crystal display screens into the tank for soaking and etching;
step seven: and (3) carrying out etching post-treatment, cleaning the outer surface of the display screen by using acetone and ethanol again to ensure that dust, oil stains and the like are not attached to the display screen, washing the glass substrate by using deionized water again, soaking for 10-15 minutes, taking out and drying to obtain the thinned liquid crystal display screen.
And D, mixing the hydrofluoric acid, the hydrochloric acid and the purified water in the mixed liquid prepared in the step two according to a mixing ratio of 2:2:1, wherein the liquid level of the mixed liquid completely submerges the display screen.
And the mixing ratio of the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in the fourth step is 2:1:2:1, the mixing method comprises the steps of adding and fully stirring the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in sequence, and the phosphate buffer solution is prepared by adding water into 250ml of 0.2 mol/L potassium dihydrogen phosphate solution and 118ml of 0.2 mol/L sodium hydroxide solution and diluting the mixture to 1000 ml.
And controlling the soaking and etching waiting time of the liquid crystal display screen subjected to deep polishing treatment and having serious defects in the etching treatment in the sixth step to be 5-10 minutes, adding an anti-corrosion air pipe at the bottom of the tank in the sixth step to generate bubbles, and baking the liquid crystal display screen for 15-20 minutes at the temperature of 150 ℃ in the seventh step.
The invention can slightly enlarge the surface defect of the liquid crystal display screen through the pretreatment before the etching, is convenient for observation and treatment, and polishes the surface defect of the liquid crystal display screen through the defect polishing treatment to ensure that the surface is smooth and bright; the chemical property of the hydrochloric acid enables crystals generated after the hydrofluoric acid and the glass react to have a temporary attachment chemical phenomenon, and the thickness of the liquid crystal display screen can be accurately controlled according to the requirement through the matching use of the nitric acid and the hydrochloric acid; the bubbling generated by the corrosion prevention air pipe at the bottom of the etching tank can impact and drop the temporarily attached crystal, so that the phenomenon of uneven etching is avoided.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The comprehensive thinning treatment process for the liquid crystal display screen is characterized by comprising the following steps of:
the method comprises the following steps: sealing glue for protection, coating a layer of frame glue on the side edge of the liquid crystal display screen, then placing the liquid crystal display screen in an oven, drying for 10-15 minutes at the temperature of 170 ℃ to solidify the frame glue to prevent etching liquid from permeating into the liquid crystal display screen, then coating photoresist on the electrode end of the liquid crystal display screen, placing the liquid crystal display screen in the oven, drying for 5-15 minutes at the temperature of 70 ℃ to solidify the photoresist, and preventing the etching liquid from corroding a lead electrode;
step two: pretreating the liquid crystal display screen, namely preparing mixed liquid from 40% hydrofluoric acid, 50% hydrochloric acid and purified water, and putting the liquid crystal display screen into a tank containing the mixed liquid for soaking for 10-15 minutes to pretreat, so that the defects on the surface of the liquid crystal display screen are slightly enlarged, and the liquid crystal display screen is convenient to observe and treat;
step three: polishing the defects, namely placing the liquid crystal display screen which is pretreated and has the defects on a workbench of a polishing machine, positioning the liquid crystal display screen by using an optical leveling instrument, fixing the peripheral edge of the liquid crystal display screen by using a clamp, uniformly coating polishing liquid on the surface of the liquid crystal display screen, standing for 30 seconds, starting the polishing machine to polish the two sides of the liquid crystal display screen, and enabling the surface of the liquid crystal display screen to be flat and bright;
step four: preparing an etching solution, namely mixing 40% hydrofluoric acid, 70% nitric acid, 50% hydrochloric acid and purified water, and dropwise adding a phosphate buffer solution to adjust the HP value of the etching solution to 8-10 to prepare the etching solution for later use;
step five: performing etching pretreatment, cleaning the two sides of the liquid crystal display screen by using acetone and ethanol in sequence to ensure that dust, oil stains and the like do not adhere to the two sides of the liquid crystal display screen, washing the liquid crystal display screen by using deionized water, soaking for 10-15 minutes, and taking out and wiping;
step six: etching treatment, namely etching by adopting a multi-piece vertical soaking method, vertically placing a plurality of liquid crystal display screens into a specially-made frame body, adding etching liquid into a tank, and placing the frame body loaded with the plurality of liquid crystal display screens into the tank for soaking and etching;
step seven: and (3) carrying out etching post-treatment, cleaning the outer surface of the display screen by using acetone and ethanol again to ensure that dust, oil stains and the like are not attached to the display screen, washing the glass substrate by using deionized water again, soaking for 10-15 minutes, taking out and drying to obtain the thinned liquid crystal display screen.
2. The comprehensive thinning treatment process for the liquid crystal display screen according to claim 1, characterized in that: and D, mixing the hydrofluoric acid, the hydrochloric acid and the purified water in the mixed liquid prepared in the step two according to a mixing ratio of 2:2:1, wherein the liquid level of the mixed liquid completely submerges the display screen.
3. The process for comprehensively thinning the liquid crystal display screen according to claim 1, wherein the hydrofluoric acid, the nitric acid, the hydrochloric acid and the purified water in the fourth step are mixed in a ratio of 2:1:2:1, the mixing method is to add and fully stir the materials in sequence, and the phosphate buffer solution is prepared by adding water into 250ml of 0.2 mol/L potassium dihydrogen phosphate solution and 118ml of 0.2 mol/L sodium hydroxide solution to dilute the materials to 1000 ml.
4. The comprehensive thinning treatment process for the liquid crystal display screen according to claim 1, characterized in that: and in the sixth etching treatment, the soaking etching waiting time is controlled to be 5-20 minutes according to the polishing degree of the defect treatment of the liquid crystal display screen in the third step, and an anti-corrosion air pipe is additionally arranged at the bottom of the tank in the sixth step so as to generate bubbling.
5. The comprehensive thinning treatment process for the liquid crystal display screen according to claim 1, characterized in that: and the drying condition in the seventh step is to bake for 15-20 minutes at 150 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010354448.9A CN111423129A (en) | 2020-04-29 | 2020-04-29 | Comprehensive thinning treatment process for liquid crystal display screen |
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| CN202010354448.9A CN111423129A (en) | 2020-04-29 | 2020-04-29 | Comprehensive thinning treatment process for liquid crystal display screen |
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