CN116754566B - Flexible folding screen protective film detection method - Google Patents

Flexible folding screen protective film detection method Download PDF

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CN116754566B
CN116754566B CN202311035432.1A CN202311035432A CN116754566B CN 116754566 B CN116754566 B CN 116754566B CN 202311035432 A CN202311035432 A CN 202311035432A CN 116754566 B CN116754566 B CN 116754566B
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pixel point
preset
brightness
image
value
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CN116754566A (en
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张永汉
王霞
刘永春
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Shaoxing Xuyuan New Material Technology Co ltd
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Shaoxing Xuyuan New Material Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
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    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
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    • B08B3/04—Cleaning involving contact with liquid
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/48—Preparation of the surfaces
    • B29C63/481—Preparation of the surfaces mechanically
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    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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    • G01—MEASURING; TESTING
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    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N1/34—Purifying; Cleaning
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
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    • B07C2301/00—Sorting according to destination
    • B07C2301/0008—Electronic Devices, e.g. keyboard, displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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Abstract

The invention relates to the field of protective film detection, in particular to a method for detecting a protective film of a flexible folding screen, which comprises the following steps of S1, degreasing and dedusting the surface of the flexible folding screen; s2, finishing pre-positioning pasting of the protective film and leveling; s3, folding and unfolding the folding screen for preset times; s4, collecting an image of the protective film; step S5, dividing the acquired image into a plurality of pixel points, for a single pixel point, controlling a detection module to detect the brightness value of the pixel point by a central control module, and determining whether the pixel point acquired for the single pixel point accords with a preset standard according to the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the acquired standard film-attached image; and S6, packaging the flexible folding screen adhered with the protective film qualified in detection, and solving the problem that the carrying performance of the factory equipment is not up to standard due to insufficient detection precision and lack of defect statistics and analysis.

Description

Flexible folding screen protective film detection method
Technical Field
The invention relates to the field of protective film detection, in particular to a method for detecting a flexible folding screen protective film.
Background
The flexible folding screen can be bent or even twisted by 360 degrees, and the electronic product applying the flexible folding screen can be designed through foldable and bendable screen technology, so that a user can obtain more information display areas by folding or unfolding the screen, and meanwhile, the flexible folding screen has higher portability, and the flexible folding screen is not only used for mobile phones, but also can be used for wearing VR (virtual reality) and dust collectors and some medical equipment.
The electronic product with the flexible folding screen is required to be stuck with the protective film before leaving the factory, firstly, the screen can be effectively protected from being scratched, static electricity and dust, and secondly, the purchasing experience of consumers can be enhanced, so that how to detect the comprehensive performance of the protective film of the product before leaving the factory, and ensuring that the screen protective film is in a good visual state gradually becomes a concern of electronic product manufacturers.
Chinese patent publication No.: CN107782280B discloses a method for detecting the thickness of a patch film and a mobile terminal for detecting the current capacitance value of a screen of the mobile terminal; judging whether a film is stuck on a screen of the mobile terminal according to the current capacitance value and the preset capacitance value, and judging whether the film affects the infrared ranging function of the mobile terminal when determining that the film is stuck on the screen of the mobile terminal; determining the thickness of the film when the film influences the infrared distance measurement function of the mobile terminal; when the thickness of the film is larger than a first preset thickness threshold and smaller than a second preset thickness threshold, the emission energy of the infrared sensor is increased, so that the influence of the film on the infrared distance measurement function of the mobile terminal is reduced; when the thickness of the film is larger than or equal to a second preset thickness threshold, prompting a user that the thickness of the film is unsuitable, and replacing the film is needed, wherein the second preset thickness threshold is larger than the first preset thickness threshold. Therefore, the detection precision of the method is not enough, and all possible defects generated after the protective film is pasted are not counted and analyzed, so that the protective film with the unqualified performance on factory equipment is caused, and the experience and the usability of the product are affected.
Disclosure of Invention
In view of the above, the invention provides a method for detecting a flexible folding screen protective film, which is used for overcoming the defects that the detection precision of the screen protective film is insufficient in the prior art, and counting and analyzing all possible defects generated after the protective film is pasted are not carried out, so that the protective film with substandard carrying performance on factory equipment is caused, and the experience and the service performance of products are affected.
In order to achieve the above object, the present invention provides a method for detecting a protective film of a flexible folding screen, comprising:
step S1, oil is removed from the surface of a flexible folding screen by using alcohol, and the surface of the screen after oil removal is removed by using a cleaning roller;
step S2, rolling the protective film along one end of the protective film by using a pasting roller after the protective film is placed above the screen to finish pre-positioning pasting of the protective film, and leveling the protective film after the pre-positioning pasting is finished by using a leveling plate to finish pasting of the protective film;
s3, folding and unfolding the screen adhered with the protective film for preset times;
s4, placing the screen in a closed state, and acquiring an image of the protective film by using an industrial camera;
step S5, dividing the acquired image into a plurality of pixel points, for a single pixel point, controlling a detection module to detect the brightness value of the pixel point, determining whether the brightness value of the pixel point meets a preset standard according to the difference value between the brightness value of the pixel point and the brightness value of the pixel point of a standard film-attached image, controlling the detection module to detect the gray value of the pixel point and determining whether the detection of the pixel point meets the preset standard according to the gray value when the brightness value of the pixel point does not meet the preset standard, or marking the pixel point as a first-level residual pixel point;
And S6, packaging the flexible folding screen adhered with the protective film which is qualified in detection.
Further, in the step S5, the central control module controls the detection module to detect the brightness value of the single pixel point, and determines a determination mode for whether the single pixel point meets a preset standard according to the difference value between the measured brightness value of the pixel point and the brightness value of the pixel point of the standard film-attached image, wherein,
the first judging mode is that the central control module judges that a single pixel point accords with a preset standard and marks the pixel point as a qualified pixel point; the first judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is smaller than a first preset brightness difference value;
the second judging mode is that the central control module judges that the single pixel point does not accord with a preset standard, controls the detection module to detect the gray value of the single pixel point, and determines whether the detection of the single pixel point accords with the judging mode of the preset standard according to the detected gray value; the second judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is larger than or equal to the first preset brightness difference value and smaller than a second preset brightness difference value;
The third judging mode is that the central control module judges that a single pixel point does not accord with a preset standard and marks the pixel point as a first-level residual sub-pixel point; and the third judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is larger than or equal to the second preset brightness difference value.
Further, the central control module controls the detection module to detect the gray value of the single pixel point in the second judging mode, and the central control module determines whether the detection of the single pixel point accords with the judging mode of the preset standard according to the detected gray value, wherein,
the first detection judging mode is a secondary judging mode that the central control module judges that the detection of the single pixel point does not accord with a preset standard, the central control module switches the screen in the step S4 to be in an on and white tone state, controls the detection module to re-detect the brightness value of the pixel point of the image, and determines whether the single pixel point accords with the preset standard or not according to the detected brightness value of the single pixel point; the first detection judging mode meets the condition that the gray value of a single pixel point is smaller than a first preset gray value;
The second detection judging mode is that the central control module judges that the detection of the single pixel point does not accord with a preset standard, and the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image are increased to corresponding values according to the difference value between the measured gray value of the single pixel point and the first preset gray value; the second detection judging mode meets the condition that the gray value of a single pixel point is larger than or equal to a first preset gray value and smaller than a second preset gray value;
the third detection judgment mode is that the central control module judges that the detection of the single pixel point meets a preset standard and marks the pixel point as a qualified pixel point; the third detection judging mode meets the condition that the gray value of the single pixel point is larger than or equal to the second preset gray value.
Further, the central control module calculates the difference between the gray value of the single pixel point and the first preset gray value in the second detection judging mode, marks the difference as a gray difference, and the adjusting module determines the adjusting mode of the brightness of the image of the protective film acquired by the industrial camera and the standard film-sticking image according to the gray difference,
The first brightness adjustment mode is that the adjustment module uses a first preset brightness adjustment coefficient to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the first brightness adjustment mode meets the condition that the gray level difference value is smaller than a first preset gray level difference value;
the second brightness adjustment mode is that the adjustment module uses a second preset brightness adjustment coefficient to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the second brightness adjustment mode meets the condition that the gray level difference value is larger than or equal to the first preset gray level difference value and smaller than a second preset gray level difference value;
the third brightness adjustment mode is that the adjustment module uses a third preset brightness adjustment coefficient to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the third brightness adjustment mode meets the condition that the gray level difference value is larger than or equal to the second preset gray level difference value.
Further, the central control module calculates the difference between the regulated brightness difference and the preset brightness difference under the first preset condition, marks the obtained difference as a correction difference, and determines the correction mode of the brightness of the protective film image and the standard film-sticking image acquired by the industrial camera according to the correction difference,
The first correction mode is that the adjustment module uses a first preset correction coefficient to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the first correction mode meets the condition that the correction difference value is smaller than a first preset correction difference value;
the second correction mode is that the adjusting module uses a second preset correction coefficient to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the second correction mode meets the condition that the correction difference value is larger than or equal to the first preset correction difference value and smaller than a second preset correction difference value;
the third correction mode is that the adjustment module uses a third preset correction coefficient to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the third correction mode meets the condition that the correction difference value is larger than or equal to the second preset correction difference value;
the first preset condition is that the adjustment module completes the increase of the brightness of the image of the protective film and the standard film-sticking image acquired by the industrial camera, the central control module calculates the difference value between the brightness value of the adjusted pixel point and the brightness value of the pixel point of the standard film-sticking image, the difference value is recorded as the adjusted brightness difference value, and the adjusted brightness difference value is larger than the preset brightness difference value.
Further, the central control module calculates the ratio of the corrected brightness difference value and the brightness difference value before correction of the single pixel point under a second preset condition to determine a secondary judgment mode for whether the pixel point meets a preset standard or not, wherein,
the first secondary judgment mode is that the central control module judges that a single pixel point accords with a preset standard and marks the pixel point as a qualified pixel point; the first secondary judgment mode satisfies that the ratio of the brightness difference value after correction to the brightness difference value before correction is greater than or equal to one;
the second secondary judgment mode is that the central control module judges that a single pixel point does not accord with a preset standard and marks the pixel point as a secondary residual pixel point; the second secondary judgment mode satisfies that the ratio of the brightness difference value after correction to the brightness difference value before correction is smaller than one;
the second preset condition is that the adjustment module completes correction of brightness of the image of the protective film and the standard film-sticking image acquired by the industrial camera; the central control module marks the difference value between the brightness value of the corrected single pixel point and the brightness value of the corrected standard film pasting image as the brightness difference value after correction, and marks the difference value between the brightness value of the corrected single pixel point and the brightness value of the corrected standard film pasting image as the brightness difference value before correction.
Further, the central control module determines whether the detection of the screen protection film meets the judgment mode of the preset standard according to the duty ratio of each residual sub-pixel point to the total pixel point of the image of the protection film under the third preset condition, wherein,
the first type of judgment mode is that the central control module judges that the detection of the screen protective film meets a preset standard and the flexible folding screen with the protective film which is qualified in detection is packaged; the first type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is smaller than a preset first-level defective ratio, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is smaller than a preset second-level defective ratio;
the second type of judgment mode is that the central control module judges that the detection of the screen protection film does not meet a preset standard, and the leveling pressure of the leveling plate in the step S2 is increased to a corresponding value according to the difference value between the duty ratio of the first-level defective pixel point and the total pixel point of the image of the protection film and the preset first-level defective duty ratio; the second type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is smaller than the preset second-level defective pixel point;
The third type of judgment mode is that the central control module judges that the detection of the screen protection film does not meet a preset standard, and reduces the rolling rotation speed of the cleaning roller in the step S1 to a corresponding value according to the difference value between the duty ratio of the second-level residual pixel point and the total pixel point of the image of the protection film and the preset second-level residual duty ratio; the third type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is smaller than the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset second-level defective pixel point;
the fourth type of judgment mode is that the central control module judges that the screen protection film detection does not meet the preset standard and does not meet the preset standard because the protection film performance is not qualified, and the central control module judges that the protection film is discarded; the fourth type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset second-level defective pixel point;
And the third preset condition meets the condition that the central control module completes the judgment of the total pixel points of the image of the protective film.
Further, the central control module determines a determination mode for whether the protective film meets a preset standard for reuse according to the duty ratio of the qualified pixel point to the total pixel point of the image of the protective film under a fourth preset condition, wherein,
the first protection film judging mode is that the central control module judges that the protection film meets the preset standard of reuse, and the protection film is reused after being cleaned; the first protective film judging mode meets the condition that the duty ratio of the qualified pixel points to the total pixel points of the image of the protective film is smaller than a preset qualified duty ratio;
the second protection film judging mode is that the central control module judges that the protection film does not accord with a preset standard for reuse, and the protection film is discarded; the second protection film judging mode meets the condition that the duty ratio of the qualified pixel point to the total pixel point of the image of the protection film is larger than or equal to a preset qualified duty ratio;
the fourth preset condition satisfies that the central control module is in the second type of judgment mode or the third type of judgment mode.
Further, the central control module calculates the difference between the duty ratio of the first-order defective pixel point and the total pixel point of the image of the protective film and the preset first-order defective pixel point in the second-type judging mode, and marks the difference as a leveling difference, the adjusting module determines an adjusting mode of the leveling pressure for the leveling plate in the step S2 according to the leveling difference,
The first pressure adjusting mode is that the adjusting module uses a first preset pressure adjusting coefficient to correspond to a leveling pressure increasing value of the leveling plate in the step S2; the first pressure adjusting mode meets the condition that the leveling difference value is smaller than a first preset leveling difference value;
the second pressure adjusting mode is that the adjusting module uses a second preset pressure adjusting coefficient to correspond to the leveling pressure increasing value of the leveling plate in the step S2; the second pressure adjusting mode meets the condition that the leveling difference value is larger than or equal to the first preset leveling difference value and smaller than a second preset leveling difference value;
the third pressure adjusting mode is that the adjusting module uses a third preset pressure adjusting coefficient to correspond to the leveling pressure increasing value of the leveling plate in the step S2; the third pressure adjusting mode meets the condition that the leveling difference value is larger than or equal to the second preset leveling difference value.
Further, the central control module calculates the difference between the duty ratio of the second-level defective pixel point and the total pixel point of the image of the protective film and the preset second-level defective duty ratio in the third-type judging mode, and marks the difference as a dust removal difference, the adjusting module determines the adjusting mode of the rolling rotation speed of the cleaning roller in the step S1 according to the dust removal difference, wherein,
The first rotation speed adjusting mode is that the adjusting module uses a first preset rotation speed adjusting coefficient to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the first rotation speed adjusting mode meets the condition that the dust removal difference value is smaller than a first preset dust removal difference value;
the second rotation speed adjusting mode is that the adjusting module uses a second preset rotation speed adjusting coefficient to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the second rotating speed adjusting mode meets the condition that the dust removal difference value is larger than or equal to the first preset dust removal difference value and smaller than a second preset dust removal difference value;
the third rotation speed adjusting mode is that the adjusting module uses a third preset rotation speed adjusting coefficient to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the third rotating speed adjusting mode meets the condition that the dust removal difference value is larger than or equal to the second preset dust removal difference value.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the industrial camera is used for collecting the image of the protective film, the collected image is divided into a plurality of pixel points, and the brightness value of each pixel point is detected.
Further, according to the difference between the brightness value of the pixel point and the brightness value of the pixel point of the standard film-attached image, whether the pixel point meets the preset standard is determined, when the pixel point does not meet the preset standard is determined, the detection module is controlled to detect the gray value of the pixel point, and according to the detected gray value, the determination mode of whether the detection of the pixel point meets the preset standard is determined, or the pixel point is marked as a first-level residual pixel point, so that the condition of the pixel point does not meet the requirement is accurately detected and determined.
Further, when the brightness value of the single pixel point does not meet the preset standard and the reason cannot be determined, the central control module further detects that the reason of the non-meeting standard is caused by the bottom color of the screen or the detected brightness by detecting the gray value of the single pixel point, so that the detection precision is further increased through targeted modification or adjustment.
Further, when the brightness value of the detected single pixel point is unqualified due to the fact that the brightness of the image of the protective film and the brightness of the standard film-attached image acquired by the industrial camera are not up to standard, the brightness is increased by the adjusting module, and the problem that the brightness value of the detected single pixel point is unqualified due to the fact that the brightness is not up to standard is solved.
Further, when the adjustment module completes the increase of the brightness of the image of the protective film acquired by the industrial camera and the standard film-attached image and the adjusted brightness difference value is larger than the preset brightness difference value, the adjustment module ensures the accuracy of brightness adjustment by correcting the brightness of the image of the protective film acquired by the industrial camera and the standard film-attached image.
Further, after the adjustment module completes correction of brightness of the protective film image acquired by the industrial camera and the standard film-attached image, whether the pixel points accord with a preset standard or not is judged secondarily, and accurate judgment of single pixel points is guaranteed.
Further, after the central control module completes the judgment of the total pixel points of the image of the protective film, the judgment mode of whether the detection of the screen protective film meets the preset standard is determined by counting and analyzing the duty ratio of each defective pixel point to the total pixel points of the image of the protective film, so that the state of the protective film before leaving the factory is judged scientifically and accurately.
Furthermore, the invention also carries out scientific judgment on whether the protective film with flaws can be reused, thereby avoiding the waste of the protective film and avoiding the problem that defective products appear on factory equipment.
Further, when the defect occurs in the adhesive protective film due to the insufficient leveling pressure of the screed in step S2, the central control module reduces or overcomes the similar defect by increasing the leveling pressure.
Further, when the rolling speed of the cleaning roller in step S1 is too high, and the dust removal does not reach the standard, the central control module sufficiently removes pollutants such as dust on the screen by reducing the rolling speed, so that the performance of the further-adhered protective film is ensured.
Drawings
FIG. 1 is a flow chart of a method for detecting a protective film of a flexible folding screen according to an embodiment of the invention;
FIG. 2 is a flowchart of a method for determining whether a single pixel point meets a preset standard according to an embodiment of the present invention;
FIG. 3 is a flowchart of a determination method for detecting whether a single pixel point meets a preset standard according to an embodiment of the present invention;
fig. 4 is a flowchart of a brightness adjustment manner of the image of the protective film and the standard film image acquired by the industrial camera according to the embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that, the data in this embodiment are obtained by comprehensive analysis and evaluation of the historical detection data and the corresponding historical detection results of three months before the current detection by the central control module. According to the invention, the central control module comprehensively determines the numerical value of each preset parameter standard aiming at the current detection according to the brightness value of the pixel point, the gray value of the pixel point, the brightness of the image of the protective film and the standard film-sticking image and the occupation ratio of the residual pixel point of the collected image which are detected in the accumulation way for 12245 times in the previous three months before the current detection. It will be understood by those skilled in the art that the determination manner of the system according to the present invention for the parameters mentioned above may be that the value with the highest duty ratio is selected as the preset standard parameter according to the data distribution, the weighted summation is used to take the obtained value as the preset standard parameter, each history data is substituted into a specific formula, and the value obtained by using the formula is taken as the preset standard parameter or other selection manner, as long as different specific conditions in the single item determination process can be definitely defined by the obtained value by the system according to the present invention are satisfied.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
Please refer to fig. 1, fig. 2, fig. 3 and fig. 4, which are flowcharts of a method for detecting a flexible folding screen protective film according to an embodiment of the invention; the embodiment of the invention discloses a flow chart of a judging mode of whether the single pixel point accords with a preset standard; the embodiment of the invention discloses a flow chart of a judging mode for judging whether the detection of a single pixel point accords with a preset standard; the embodiment of the invention discloses a flow chart of a brightness adjusting mode of an image of a protective film and a standard film-sticking image acquired by an industrial camera.
The detection method of the embodiment of the invention comprises the following steps:
step S1, oil is removed from the surface of a flexible folding screen by using alcohol, and the surface of the screen after oil removal is removed by using a cleaning roller;
step S2, rolling the protective film along one end of the protective film by using a pasting roller after the protective film is placed above the screen to finish pre-positioning pasting of the protective film, and leveling the protective film after the pre-positioning pasting is finished by using a leveling plate to finish pasting of the protective film;
step S3, folding and unfolding the screen to which the protective film is attached 100 times;
s4, placing the screen in a closed state, and acquiring an image of the protective film by using an industrial camera;
Step S5, dividing the acquired image into a plurality of pixel points, for a single pixel point, controlling a detection module to detect the brightness value of the pixel point, determining whether the brightness value of the pixel point meets a preset standard according to the difference value between the brightness value of the pixel point and the brightness value of the pixel point of a standard film-attached image, controlling the detection module to detect the gray value of the pixel point and determining whether the detection of the pixel point meets the preset standard according to the gray value when the brightness value of the pixel point does not meet the preset standard, or marking the pixel point as a first-level residual pixel point;
and S6, packaging the flexible folding screen adhered with the protective film which is qualified in detection.
Specifically, in the step S5, the central control module controls the detection module to detect the brightness value of the single pixel point, and determines a determination mode for whether the single pixel point meets a preset standard according to the difference value between the measured brightness value of the pixel point and the brightness value 100 of the pixel point of the standard film-attached image, wherein,
the first judging mode is that the central control module judges that a single pixel point accords with a preset standard and marks the pixel point as a qualified pixel point; the first judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is smaller than a first preset brightness difference value of 25.23;
The second judging mode is that the central control module judges that the single pixel point does not accord with a preset standard, controls the detection module to detect the gray value of the single pixel point, and determines whether the detection of the single pixel point accords with the judging mode of the preset standard according to the detected gray value; the second judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is more than or equal to the first preset brightness difference value and less than the second preset brightness difference value by 28.35;
the third judging mode is that the central control module judges that a single pixel point does not accord with a preset standard and marks the pixel point as a first-level residual sub-pixel point; and the third judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is larger than or equal to the second preset brightness difference value.
Specifically, the central control module controls the detection module to detect the gray value of the single pixel point in the second judging mode, and the central control module determines whether the detection of the single pixel point accords with the judging mode of the preset standard according to the detected gray value, wherein,
The first detection judging mode is a secondary judging mode that the central control module judges that the detection of the single pixel point does not accord with a preset standard, the central control module switches the screen in the step S4 to be in an on and white tone state, controls the detection module to re-detect the brightness value of the pixel point of the image, and determines whether the single pixel point accords with the preset standard or not according to the detected brightness value of the single pixel point; the first detection and judgment mode satisfies that the gray value of a single pixel point is smaller than a first preset gray value 102.80;
the second detection judging mode is that the central control module judges that the detection of the single pixel point does not accord with a preset standard, and the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image are increased to corresponding values according to the difference value between the measured gray value of the single pixel point and the first preset gray value; the second detection and judgment mode satisfies that the gray value of the single pixel point is larger than or equal to the first preset gray value and smaller than the second preset gray value 156.30;
the third detection judgment mode is that the central control module judges that the detection of the single pixel point meets a preset standard and marks the pixel point as a qualified pixel point; the third detection judging mode meets the condition that the gray value of the single pixel point is larger than or equal to the second preset gray value.
Specifically, the central control module calculates the difference between the gray value of the single pixel point and the first preset gray value in the second detection judging mode, marks the difference as a gray difference, and the adjusting module determines the adjusting mode of the brightness of the image of the protective film acquired by the industrial camera and the standard film-sticking image according to the gray difference,
the first brightness adjustment mode is that the adjustment module uses a first preset brightness adjustment coefficient of 1.02 to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the first brightness adjustment mode meets the condition that the gray level difference value is smaller than a first preset gray level difference value 18.52;
the second brightness adjustment mode is that the adjustment module uses a second preset brightness adjustment coefficient of 1.04 to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the second brightness adjustment mode meets the condition that the gray level difference value is more than or equal to the first preset gray level difference value and less than a second preset gray level difference value by 35.58;
the third brightness adjustment mode is that the adjustment module uses a third preset brightness adjustment coefficient of 1.08 to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the third brightness adjustment mode meets the condition that the gray level difference value is larger than or equal to the second preset gray level difference value.
Specifically, the central control module calculates the difference between the regulated brightness difference and the preset brightness difference of 25.00 under the first preset condition, marks the obtained difference as a correction difference, and determines the correction mode of the brightness of the image of the protective film and the standard film-sticking image acquired by the industrial camera according to the correction difference, wherein,
the first correction mode is that the adjustment module uses a first preset correction coefficient of 0.999 to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the first correction mode meets the condition that the correction difference is smaller than a first preset correction difference value of 2.23;
the second correction mode is that the adjusting module uses a second preset correction coefficient of 0.998 to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the second correction mode meets the condition that the correction difference is larger than or equal to the first preset correction difference and smaller than a second preset correction difference by 5.88;
the third correction mode is that the adjustment module uses a third preset correction coefficient of 0.995 to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the third correction mode meets the condition that the correction difference value is larger than or equal to the second preset correction difference value;
The first preset condition is that the adjustment module completes the increase of the brightness of the image of the protective film and the standard film-sticking image acquired by the industrial camera, the central control module calculates the difference value between the brightness value of the adjusted pixel point and the brightness value of the pixel point of the standard film-sticking image, the difference value is recorded as the adjusted brightness difference value, and the adjusted brightness difference value is larger than the preset brightness difference value.
Specifically, the central control module calculates the ratio of the corrected brightness difference value and the brightness difference value before correction of the single pixel point under a second preset condition to determine a secondary judgment mode for whether the pixel point meets a preset standard or not, wherein,
the first secondary judgment mode is that the central control module judges that a single pixel point accords with a preset standard and marks the pixel point as a qualified pixel point; the first secondary judgment mode satisfies that the ratio of the brightness difference value after correction to the brightness difference value before correction is greater than or equal to one;
the second secondary judgment mode is that the central control module judges that a single pixel point does not accord with a preset standard and marks the pixel point as a secondary residual pixel point; the second secondary judgment mode satisfies that the ratio of the brightness difference value after correction to the brightness difference value before correction is smaller than one;
The second preset condition is that the adjustment module completes correction of brightness of the image of the protective film and the standard film-sticking image acquired by the industrial camera; the central control module marks the difference value between the brightness value of the corrected single pixel point and the brightness value of the corrected standard film pasting image as the brightness difference value after correction, and marks the difference value between the brightness value of the corrected single pixel point and the brightness value of the corrected standard film pasting image as the brightness difference value before correction.
Specifically, the central control module determines, under a third preset condition, a determination mode for whether the detection of the screen protection film meets a preset standard according to the duty ratio of each residual sub-pixel point to the total pixel points of the image of the protection film, wherein,
the first type of judgment mode is that the central control module judges that the detection of the screen protective film meets a preset standard and the flexible folding screen with the protective film which is qualified in detection is packaged; the first type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is smaller than 0.5% of the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is smaller than 0.3% of the preset second-level defective pixel point;
The second type of judgment mode is that the central control module judges that the detection of the screen protection film does not meet a preset standard, and the leveling pressure of the leveling plate in the step S2 is increased to a corresponding value according to the difference value between the duty ratio of the first-level defective pixel point and the total pixel point of the image of the protection film and the preset first-level defective duty ratio; the second type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is more than or equal to 0.5% of the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is less than 0.3% of the preset second-level defective pixel point;
the third type of judgment mode is that the central control module judges that the detection of the screen protection film does not meet a preset standard, and reduces the rolling rotation speed of the cleaning roller in the step S1 to a corresponding value according to the difference value between the duty ratio of the second-level residual pixel point and the total pixel point of the image of the protection film and the preset second-level residual duty ratio; the third type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is smaller than the preset first-level defective pixel point by 0.5%, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset second-level defective pixel point by 0.3%;
The fourth type of judgment mode is that the central control module judges that the screen protection film detection does not meet the preset standard and does not meet the preset standard because the protection film performance is not qualified, and the central control module judges that the protection film is discarded; the fourth type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is greater than or equal to 0.5% of the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is greater than or equal to 0.3% of the preset second-level defective pixel point;
and the third preset condition meets the condition that the central control module completes the judgment of the total pixel points of the image of the protective film.
Specifically, the central control module determines a determination mode for whether the protective film meets a preset standard for reuse according to the duty ratio of the qualified pixel point to the total pixel point of the image of the protective film under a fourth preset condition, wherein,
the first protection film judging mode is that the central control module judges that the protection film meets the preset standard of reuse, and the protection film is reused after being cleaned; the first protective film judging mode meets the condition that the ratio of the qualified pixel points to the total pixel points of the image of the protective film is smaller than 99.6% of the preset qualified ratio;
The second protection film judging mode is that the central control module judges that the protection film does not accord with a preset standard for reuse, and the protection film is discarded; the second protection film judging mode meets the condition that the duty ratio of the qualified pixel point to the total pixel point of the image of the protection film is larger than or equal to a preset qualified duty ratio;
the fourth preset condition satisfies that the central control module is in the second type of judgment mode or the third type of judgment mode.
Specifically, the central control module calculates the difference between the duty ratio of the first-order defective pixel point and the total pixel point of the image of the protective film and the preset first-order defective pixel point in the second-type determination mode, and marks the difference as a leveling difference, and the adjustment module determines an adjustment mode of the leveling pressure for the leveling plate in the step S2 according to the leveling difference,
the first pressure adjusting mode is that the adjusting module uses a first preset pressure adjusting coefficient 1.10 to correspond to the leveling pressure increasing value of the leveling plate in the step S2; the first pressure adjusting mode meets the condition that the leveling difference value is smaller than a first preset leveling difference value by 0.12%;
the second pressure adjusting mode is that the adjusting module uses a second preset pressure adjusting coefficient 1.20 to correspond to the leveling pressure increasing value of the leveling plate in the step S2; the second pressure adjusting mode meets the condition that the leveling difference value is larger than or equal to the first preset leveling difference value and smaller than the second preset leveling difference value by 0.28%;
The third pressure adjusting mode is that the adjusting module uses a third preset pressure adjusting coefficient 1.30 to correspond to the leveling pressure increasing value of the leveling plate in the step S2; the third pressure adjusting mode meets the condition that the leveling difference value is larger than or equal to the second preset leveling difference value.
Specifically, the central control module calculates the difference between the duty ratio of the second-level defective pixel point and the total pixel point of the image of the protective film and the preset second-level defective pixel point in the third-type judging mode, and marks the difference as a dust removal difference, and the adjusting module determines an adjusting mode for the rolling rotation speed of the cleaning roller in the step S1 according to the dust removal difference,
the first rotation speed adjusting mode is that the adjusting module uses a first preset rotation speed adjusting coefficient of 0.95 to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value of 0.08%; the first rotation speed adjusting mode meets the condition that the dust removal difference value is smaller than a first preset dust removal difference value;
the second rotation speed adjusting mode is that the adjusting module uses a second preset rotation speed adjusting coefficient of 0.85 to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the second rotating speed adjusting mode meets the condition that the dust removal difference value is more than or equal to the first preset dust removal difference value and less than 0.16% of a second preset dust removal difference value;
The third rotation speed adjusting mode is that the adjusting module uses a third preset rotation speed adjusting coefficient of 0.70 to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the third rotating speed adjusting mode meets the condition that the dust removal difference value is larger than or equal to the second preset dust removal difference value.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method for detecting a flexible folding screen protective film, comprising:
Step S1, oil is removed from the surface of a flexible folding screen by using alcohol, and the surface of the screen after oil removal is removed by using a cleaning roller;
step S2, rolling the protective film along one end of the protective film by using a pasting roller after the protective film is placed above the screen to finish pre-positioning pasting of the protective film, and leveling the protective film after the pre-positioning pasting is finished by using a leveling plate to finish pasting of the protective film;
s3, folding and unfolding the screen adhered with the protective film for preset times;
s4, placing the screen in a closed state, and acquiring an image of the protective film by using an industrial camera;
step S5, dividing the acquired image into a plurality of pixel points, for a single pixel point, controlling a detection module to detect the brightness value of the pixel point, determining whether the brightness value of the pixel point meets a preset standard according to the difference value between the brightness value of the pixel point and the brightness value of the pixel point of a standard film-attached image, controlling the detection module to detect the gray value of the pixel point and determining whether the detection of the pixel point meets the preset standard according to the gray value when the brightness value of the pixel point does not meet the preset standard, or marking the pixel point as a first-level residual pixel point;
S6, packaging the flexible folding screen adhered with the protective film which is qualified in detection;
in the step S5, the central control module controls the detection module to detect the brightness value of the single pixel point, and determines a determination mode for whether the single pixel point meets a preset standard according to the difference value between the measured brightness value of the pixel point and the brightness value of the pixel point of the standard film-attached image, wherein,
the first judging mode is that the central control module judges that a single pixel point accords with a preset standard and marks the pixel point as a qualified pixel point; the first judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is smaller than a first preset brightness difference value;
the second judging mode is that the central control module judges that the single pixel point does not accord with a preset standard, controls the detection module to detect the gray value of the single pixel point, and determines whether the detection of the single pixel point accords with the judging mode of the preset standard according to the detected gray value; the second judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is larger than or equal to the first preset brightness difference value and smaller than a second preset brightness difference value;
The third judging mode is that the central control module judges that a single pixel point does not accord with a preset standard and marks the pixel point as a first-level residual sub-pixel point; the third judging mode meets the condition that the difference value between the brightness value of the pixel point and the brightness value of the pixel point of the standard film pasting image is larger than or equal to the second preset brightness difference value;
the central control module controls the detection module to detect the gray value of the single pixel point in the second judging mode, and the central control module determines whether the detection of the single pixel point accords with the judging mode of the preset standard according to the detected gray value, wherein,
the first detection judging mode is a secondary judging mode that the central control module judges that the detection of the single pixel point does not accord with a preset standard, the central control module switches the screen in the step S4 to be in an on and white tone state, controls the detection module to re-detect the brightness value of the pixel point of the image, and determines whether the single pixel point accords with the preset standard or not according to the detected brightness value of the single pixel point; the first detection judging mode meets the condition that the gray value of a single pixel point is smaller than a first preset gray value;
The second detection judging mode is that the central control module judges that the detection of the single pixel point does not accord with a preset standard, and the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image are increased to corresponding values according to the difference value between the measured gray value of the single pixel point and the first preset gray value; the second detection judging mode meets the condition that the gray value of a single pixel point is larger than or equal to a first preset gray value and smaller than a second preset gray value;
the third detection judgment mode is that the central control module judges that the detection of the single pixel point meets a preset standard and marks the pixel point as a qualified pixel point; the third detection judging mode meets the condition that the gray value of the single pixel point is larger than or equal to the second preset gray value.
2. The method according to claim 1, wherein the central control module calculates a difference between the gray value of the single pixel point and the first preset gray value in the second detection determination mode, and marks the difference as a gray difference, and the adjustment module determines an adjustment mode for brightness of the image of the protective film acquired by the industrial camera and the standard film-attached image according to the gray difference, wherein,
The first brightness adjustment mode is that the adjustment module uses a first preset brightness adjustment coefficient to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the first brightness adjustment mode meets the condition that the gray level difference value is smaller than a first preset gray level difference value;
the second brightness adjustment mode is that the adjustment module uses a second preset brightness adjustment coefficient to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the second brightness adjustment mode meets the condition that the gray level difference value is larger than or equal to the first preset gray level difference value and smaller than a second preset gray level difference value;
the third brightness adjustment mode is that the adjustment module uses a third preset brightness adjustment coefficient to increase the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the third brightness adjustment mode meets the condition that the gray level difference value is larger than or equal to the second preset gray level difference value.
3. The method for detecting a protective film for a flexible folding screen according to claim 2, wherein the central control module calculates a difference between the adjusted brightness difference and a preset brightness difference under a first preset condition, and marks the calculated difference as a corrected difference, and the adjustment module determines a correction mode for brightness of the protective film image and the standard film-attached image acquired by the industrial camera according to the corrected difference,
The first correction mode is that the adjustment module uses a first preset correction coefficient to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the first correction mode meets the condition that the correction difference value is smaller than a first preset correction difference value;
the second correction mode is that the adjusting module uses a second preset correction coefficient to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the second correction mode meets the condition that the correction difference value is larger than or equal to the first preset correction difference value and smaller than a second preset correction difference value;
the third correction mode is that the adjustment module uses a third preset correction coefficient to reduce the brightness of the image of the protective film acquired by the industrial camera and the brightness of the standard film-sticking image to corresponding values; the third correction mode meets the condition that the correction difference value is larger than or equal to the second preset correction difference value;
the first preset condition is that the adjustment module completes the increase of the brightness of the image of the protective film and the standard film-sticking image acquired by the industrial camera, the central control module calculates the difference value between the brightness value of the adjusted pixel point and the brightness value of the pixel point of the standard film-sticking image, the difference value is recorded as the adjusted brightness difference value, and the adjusted brightness difference value is larger than the preset brightness difference value.
4. The method for detecting a flexible folding screen protective film according to claim 3, wherein the central control module calculates a ratio between a corrected brightness difference value and a pre-corrected brightness difference value of a single pixel point under a second preset condition to determine a secondary determination mode for whether the pixel point meets a preset standard, wherein,
the first secondary judgment mode is that the central control module judges that a single pixel point accords with a preset standard and marks the pixel point as a qualified pixel point; the first secondary judgment mode satisfies that the ratio of the brightness difference value after correction to the brightness difference value before correction is greater than or equal to one;
the second secondary judgment mode is that the central control module judges that a single pixel point does not accord with a preset standard and marks the pixel point as a secondary residual pixel point; the second secondary judgment mode satisfies that the ratio of the brightness difference value after correction to the brightness difference value before correction is smaller than one;
the second preset condition is that the adjustment module completes correction of brightness of the image of the protective film and the standard film-sticking image acquired by the industrial camera; the central control module marks the difference value between the brightness value of the corrected single pixel point and the brightness value of the corrected standard film pasting image as the brightness difference value after correction, and marks the difference value between the brightness value of the corrected single pixel point and the brightness value of the corrected standard film pasting image as the brightness difference value before correction.
5. The method according to claim 4, wherein the central control module determines a determination mode for whether the detection of the screen protection film meets a preset standard according to a ratio of each residual sub-pixel to a total pixel of an image of the protection film under a third preset condition,
the first type of judgment mode is that the central control module judges that the detection of the screen protective film meets a preset standard and the flexible folding screen with the protective film which is qualified in detection is packaged; the first type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is smaller than a preset first-level defective ratio, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is smaller than a preset second-level defective ratio;
the second type of judgment mode is that the central control module judges that the detection of the screen protection film does not meet a preset standard, and the leveling pressure of the leveling plate in the step S2 is increased to a corresponding value according to the difference value between the duty ratio of the first-level defective pixel point and the total pixel point of the image of the protection film and the preset first-level defective duty ratio; the second type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is smaller than the preset second-level defective pixel point;
The third type of judgment mode is that the central control module judges that the detection of the screen protection film does not meet a preset standard, and reduces the rolling rotation speed of the cleaning roller in the step S1 to a corresponding value according to the difference value between the duty ratio of the second-level residual pixel point and the total pixel point of the image of the protection film and the preset second-level residual duty ratio; the third type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is smaller than the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset second-level defective pixel point;
the fourth type of judgment mode is that the central control module judges that the screen protection film detection does not meet the preset standard and does not meet the preset standard because the protection film performance is not qualified, and the central control module judges that the protection film is discarded; the fourth type of judgment mode satisfies that the ratio of the first-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset first-level defective pixel point, and the ratio of the second-level defective pixel point to the total pixel point of the image of the protective film is larger than or equal to the preset second-level defective pixel point;
And the third preset condition meets the condition that the central control module completes the judgment of the total pixel points of the image of the protective film.
6. The method according to claim 5, wherein the central control module determines a determination mode for whether the protective film meets a preset standard for reuse according to a ratio of the qualified pixel point to a total pixel point of an image of the protective film under a fourth preset condition, wherein,
the first protection film judging mode is that the central control module judges that the protection film meets the preset standard of reuse, and the protection film is reused after being cleaned; the first protective film judging mode meets the condition that the duty ratio of the qualified pixel points to the total pixel points of the image of the protective film is smaller than a preset qualified duty ratio;
the second protection film judging mode is that the central control module judges that the protection film does not accord with a preset standard for reuse, and the protection film is discarded; the second protection film judging mode meets the condition that the duty ratio of the qualified pixel point to the total pixel point of the image of the protection film is larger than or equal to a preset qualified duty ratio;
the fourth preset condition satisfies that the central control module is in the second type of judgment mode or the third type of judgment mode.
7. The method according to claim 6, wherein the central control module calculates a difference between a duty ratio of the first-order defective pixel and a total pixel of an image of the protective film and the preset first-order defective pixel in the second-type determination mode, and marks the difference as a leveling difference, and the adjustment module determines an adjustment mode of a leveling pressure for the screed in the step S2 based on the leveling difference, wherein,
the first pressure adjusting mode is that the adjusting module uses a first preset pressure adjusting coefficient to correspond to a leveling pressure increasing value of the leveling plate in the step S2; the first pressure adjusting mode meets the condition that the leveling difference value is smaller than a first preset leveling difference value;
the second pressure adjusting mode is that the adjusting module uses a second preset pressure adjusting coefficient to correspond to the leveling pressure increasing value of the leveling plate in the step S2; the second pressure adjusting mode meets the condition that the leveling difference value is larger than or equal to the first preset leveling difference value and smaller than a second preset leveling difference value;
the third pressure adjusting mode is that the adjusting module uses a third preset pressure adjusting coefficient to correspond to the leveling pressure increasing value of the leveling plate in the step S2; the third pressure adjusting mode meets the condition that the leveling difference value is larger than or equal to the second preset leveling difference value.
8. The method according to claim 7, wherein the central control module calculates a difference between a duty ratio of the second-order defective pixel and a total pixel of an image of the protective film and the preset second-order defective duty ratio in the third type of determination mode, and marks the difference as a dust removal difference, and the adjustment module determines an adjustment mode for the rolling rotation speed of the cleaning roller in the step S1 based on the dust removal difference, wherein,
the first rotation speed adjusting mode is that the adjusting module uses a first preset rotation speed adjusting coefficient to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the first rotation speed adjusting mode meets the condition that the dust removal difference value is smaller than a first preset dust removal difference value;
the second rotation speed adjusting mode is that the adjusting module uses a second preset rotation speed adjusting coefficient to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the second rotating speed adjusting mode meets the condition that the dust removal difference value is larger than or equal to the first preset dust removal difference value and smaller than a second preset dust removal difference value;
the third rotation speed adjusting mode is that the adjusting module uses a third preset rotation speed adjusting coefficient to reduce the rotation speed of the rolling of the cleaning roller in the step S1 to a corresponding value; the third rotating speed adjusting mode meets the condition that the dust removal difference value is larger than or equal to the second preset dust removal difference value.
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