A PDLC film material pre-detection system and detection method

Abstract

The present application relates to the technical field of light control film production, and provides a PDLC film material pre-detection system and a detection method, the detection system comprising a detection platform, a power supply, an image detection component and a control module, the PDLC film material to be detected with a prepositioned copper foil is placed on the detection platform, the power supply is controlled to apply a preset voltage to the PDLC film material so as to expose the defects in the film material before cutting, the image detection component is combined to take an image of the defect area, thereby obtaining the relative position of the defect area in the entire film plane, and then the coordinate position of the defect area is obtained, so as to avoid the defect area during subsequent cutting, and to avoid the waste caused by the detection of defective products after the preparation of conductive silver paste, that is, the pre-detection of the PDLC film material is conducive to cost saving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light control film production, and in particular to a PDLC film material pre-detection system and method. BACKGROUND

[0002] Polymer dispersed liquid crystal, also known as PDLC (Polymer Dispersed Liquid Crystal), is a technology that uses phase separation to uniformly disperse liquid crystal in micron-sized droplets in an organic solid polymer matrix. Since the optical axis of the small droplets composed of liquid crystal molecules is in free orientation, its refractive index does not match that of the matrix. When light passes through the matrix, it is strongly scattered by the droplets, resulting in an opaque milky white state or a semi-transparent state. Applying an electric field can adjust the orientation of the liquid crystal droplets. When the refractive indices of the two match, a transparent state is presented. Remove the electric field, and the liquid crystal droplets return to the original light scattering state, thereby displaying.

[0003] During the preparation of the PDLC film material, impurity particles, protruding tips and other defects may occur, which may cause the PDLC film material to be blackened or burned when powered on. Therefore, detection must be performed before shipment to ensure yield. The existing detection method usually needs to first cut the PDLC film material in half, and then expose the ITO layer by wiping off the lower liquid crystal layer to enable power-on appearance defect inspection. To ensure the reliability of the electrode, electrode printing is often made. Since the PDLC film material needs to complete electrode preparation before appearance and high voltage inspection, electrode preparation will consume expensive conductive paste, and once a defect occurs during high voltage charging, the conductive paste will be wasted. SUMMARY

[0004] The present application aims to provide a PDLC film material pre-detection system and method to solve the problem of material waste caused by defects even if defects are found after the PDLC film material is cut in half and silver paste electrodes are prepared.

[0005] In a first aspect, the present application provides a PDLC film material pre-detection system, comprising:

[0006] An inspection platform is used to fix the PDLC film material to be tested. The PDLC film material to be tested includes a first conductive layer, a first copper foil, two first insulating magnetic strips, a PDLC layer, a second conductive layer, a second copper foil, and two second insulating magnetic strips. The first copper foil and the second copper foil are respectively sandwiched between the first conductive layer and the second conductive layer, and are located on opposite sides of the PDLC layer. The first copper foil is held in place on the upper surface of the second conductive layer by the two first insulating magnetic strips, and the second copper foil is held in place on the lower surface of the first conductive layer by the two second insulating magnetic strips. No electrodes are fabricated on the PDLC film material to be tested.

[0007] A power supply, the positive and negative terminals of which are connected to the first copper foil and the second copper foil, respectively, to apply a preset voltage to the PDLC film.

[0008] An image detection component is arranged around the periphery of the inspection platform for taking images of the surface of the PDLC film.

[0009] The control module is electrically connected to the power supply and the image detection component. It is used to control the power supply to apply a preset voltage to the PDLC film to test for defect areas, and to control the image detection component to acquire image information of the test area. The control module determines the coordinate position of the defect area based on the image information of the test area and stores it so that the defect area can be avoided during subsequent cutting.

[0010] Optionally, the PDLC membrane pre-inspection system further includes: a coding and marking component, which is movably mounted on the inspection platform; the control module is electrically connected to the coding and marking component and is used to control the coding and marking component to mark the defect area according to the coordinate position.

[0011] Optionally, the PDLC membrane pre-inspection system further includes: a longitudinal guide rail and a movable support frame; the longitudinal guide rail is arranged on both sides of the inspection platform along the length direction of the inspection platform, the lower end of the movable support frame is slidably connected to the longitudinal guide rail and driven by a first driving component; the movable support frame includes a transverse support spanning above the inspection platform, a transverse guide rail is arranged on the transverse support, and an installation component that can slide along the width direction of the inspection platform is arranged on the transverse guide rail and driven by a second driving component; the inkjet marking component is fixed on the installation component, and the control module is electrically connected to the first driving component and the second driving component respectively, for driving the inkjet marking component to move according to the coordinate position to inkjet mark each of the defect areas.

[0012] Optionally, the PDLC film material pre-detection system further comprises an adsorption assembly and a mechanical arm; the adsorption assembly is fixed on the mounting assembly and used for adsorbing the base material layer on the upper side of the PDLC raw film material; wherein the PDLC raw film material comprises, from top to bottom, a first base material layer, a first conductive layer, a PDLC layer, a second conductive layer and a second base material layer, the covering area of the first conductive layer and the second conductive layer is larger than the covering area of the PDLC layer, so that the first conductive layer and the second conductive layer located in the edge non-coating area are attached, thereby completely surrounding the PDLC layer in the middle coating area.

[0013] The mechanical arm is arranged on both sides of the inspection platform, and a clamping mechanism can be arranged at the end of the mechanical arm, which is used for inserting the first copper foil, two first insulating magnetic strips, the second copper foil and two second insulating magnetic strips into the preset position of the PDLC raw film material after the first base material layer is adsorbed, so as to form the PDLC film material to be detected.

[0014] Optionally, the width of the first insulating magnetic strip is greater than the width of the first copper foil; and / or the width of the second insulating magnetic strip is greater than the width of the second copper foil.

[0015] Optionally, the first insulating magnetic strip and the second insulating magnetic strip are both rubber soft magnetic strips.

[0016] Optionally, the total thickness of the first insulating magnetic strip and the first copper foil between the first conductive layer and the second conductive layer is within 2 microns of the thickness of the PDLC layer; and the total thickness of the second insulating magnetic strip and the second copper foil between the first conductive layer and the second conductive layer is within 2 microns of the thickness of the PDLC layer.

[0017] Optionally, the PDLC film material pre-detection system further comprises a light supplementing assembly; the light supplementing assembly is arranged on the moving support frame and used for supplementing light when the image detection component photographs the surface of the PDLC film material.

[0018] Optionally, the preset voltage of the power supply is 1.5-3 times of the product nominal voltage; and / or the discharge voltage of the power supply is 10-36V.

[0019] In a second aspect, the present application further provides a PDLC film material pre-detection method based on the PDLC film material pre-detection system of the first aspect, and the PDLC film material pre-detection method comprises the following steps:

[0020] S100, placing the PDLC film material to be detected on the inspection platform and adsorbing and fixing it;

[0021] S200, testing the defect area after applying a preset voltage to the PDLC film material;

[0022] S300, obtaining image information of the defect area, and determining a coordinate position corresponding to the defect area according to the image information of the defect area.

[0023] S400, marking the defect area by code printing according to the coordinate position, determining a cutting scheme for avoiding the defect area, cutting the PDLC film material to be detected into a plurality of PDLC product films, preparing electrodes for the PDLC product films to obtain finished products, and testing the finished products by electrifying to check whether there is a defect.

[0024] Optionally, the S100 further includes:

[0025] S110, placing a PDLC raw film material on an inspection platform and adsorbing and fixing the PDLC raw film material;

[0026] S120, adsorbing and pulling up one side of the PDLC raw film material containing a first conductive layer;

[0027] S130, inserting a first copper foil sheet, two first insulating magnetic strips, a second copper foil sheet, and two second insulating magnetic strips into a preset position of the PDLC raw film material to form the PDLC film material to be detected.

[0028] Optionally, the S200 further includes:

[0029] S210, applying a preset high voltage to the PDLC film material to expose a burst point defect;

[0030] And the S300 further includes:

[0031] S310, obtaining image information of the burst point defect, and determining a coordinate position corresponding to the burst point defect according to the image information of the burst point defect.

[0032] Optionally, the S200 further includes:

[0033] S220, slowly discharging the PDLC film material to expose a coating defect;

[0034] And the S300 further includes:

[0035] S320, obtaining image information of the coating defect, and determining a coordinate position corresponding to the coating defect according to the image information of the coating defect.

[0036] Optionally, the S200 further includes:

[0037] S230, applying a normal voltage to the PDLC film material and slowly discharging to expose a non-conductive foreign matter;

[0038] And, the S300 further comprises:

[0039] S330, acquire the image information of the non-conductive foreign matter, and determine the coordinate position corresponding to the non-conductive foreign matter according to the image information of the non-conductive foreign matter.

[0040] The embodiment of the application has at least the following technical effects:

[0041] The PDLC film material pre-detection system and method provided by the embodiment of the application, by connecting the power supply to the PDLC film material pre-provided with the copper foil sheet, and controlling the power supply to apply a preset voltage to the PDLC film material, so as to expose the defects in the film material before cutting, and combining the image detection component to shoot the image of the defect area, so as to acquire the relative position of the defect area in the whole film plane, and then acquire the coordinate position of the defect area, so as to avoid the defect area during subsequent cutting, and avoid the waste caused by detecting the defective product after the preparation of the conductive silver paste, that is, the pre-detection of the PDLC film material is conducive to saving the cost. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0043] Figure 1 A structural schematic diagram of a PDLC film material pre-detection system provided by the embodiment of the application;

[0044] Figure 2 A module connection schematic diagram of each component of a PDLC film material pre-detection system provided by the embodiment of the application;

[0045] Figure 3 A film layer structure schematic diagram of a PDLC raw film material provided by the embodiment of the application;

[0046] Figure 4 A film layer structure schematic diagram of a PDLC film material provided by the embodiment of the application;

[0047] Figure 5 A flowchart of a PDLC film material pre-detection method provided by the embodiment of the application;

[0048] Figure 6 A specific flowchart of step S100 in a PDLC film material pre-detection method provided by the embodiment of the application;

[0049] Figure 7 A specific flowchart of step S200 in a PDLC film pre-detection method provided by an embodiment of the present application is shown in the figure;

[0050] Figure 8 A specific flowchart of step S300 in a PDLC film pre-detection method provided by an embodiment of the present application is shown in the figure.

[0051] Reference signs:

[0052] 100 - inspection platform;

[0053] 200 - PDLC film; 210 - first conductive layer; 220 - second conductive layer; 230 - PDLC layer; 240 - first copper foil sheet; 250 - first insulating magnetic strip; 260 - second copper foil sheet; 270 - second insulating magnetic strip;

[0054] 300 - moving support frame; 300a - first driving component; 310 - transverse support; 310a - second driving component; 311 - mounting assembly;

[0055] 400 - longitudinal guide rail;

[0056] 500 - code spraying marking component;

[0057] 600 - adsorption assembly;

[0058] 700 - image detection component;

[0059] 800 - power supply;

[0060] 900 - mechanical arm;

[0061] 1000 - control module. DETAILED DESCRIPTION

[0062] The technical solutions of the present application will be described in detail below in conjunction with embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0063] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood as having meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0064] As will be understood by one of skill in the art, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be further understood that the terms "comprise," "comprises," "comprising," "include," "includes," "including," "contain," "contains," "containing," "have," "has," "having," or the like, are open-ended linking verbs of inclusion, specifically excluding items or steps other than the those specifically recited. Terms concerning the relative position of elements are defined in relation to the orientation of the device as shown in the drawings.

[0065] In combination Figure 1 And Figure 2 As shown in the drawings, the embodiment of the present application provides a PDLC film pre-detection system, which comprises a detection platform 100, a power supply 800, an image detection component 700 and a control module 1000.

[0066] Specifically, the detection platform 100 is provided with a flat surface with vacuum adsorption function for fixing the PDLC film 200 to be detected. The PDLC film 200 to be detected is a film structure before edge pre-cutting and without electrode preparation. As shown in the drawings, Figure 4 The PDLC film 200 to be detected comprises a first conductive layer 210, a first copper foil sheet 240, two first insulating magnetic adsorption strips 250, a PDLC layer 230 (polymer liquid crystal layer), a second conductive layer 220, a second copper foil sheet 260, and two second insulating magnetic adsorption strips 270. The first copper foil sheet 240 and the second copper foil sheet 260 are respectively clamped between the first conductive layer 210 and the second conductive layer 220 and are respectively located on both sides of the PDLC layer 230. The first copper foil sheet 240 is clamped and adsorbed on the upper surface of the second conductive layer 220 by the two first insulating magnetic adsorption strips 250, and the second copper foil sheet 260 is clamped and adsorbed on the lower surface of the first conductive layer 210 by the two second insulating magnetic adsorption strips 270. In this way, the first copper foil sheet 240 is used as the electrode of the entire second conductive layer 220 and is led out, and the second copper foil sheet 260 is used as the electrode of the entire first conductive layer 210 and is led out, so as to be conductively connected with the power supply 800.

[0067] It should be noted that the insulating magnetic adsorption strips located between the first conductive layer 210 and the second conductive layer 220 can separate the first conductive layer 210 and the second conductive layer 220 to avoid short circuit caused by direct contact between them, and can also fix the copper foil sheet together with the other insulating magnetic adsorption strip.

[0068] Further, the positive and negative poles of the power supply 800 are connected with the first and second copper foil sheets 240 and 260 respectively, for applying a preset voltage to the PDLC film 200, so as to test the defect area. Optionally, the film is subjected to normal or high voltage electrification before the silver paste electrode is cut and prepared. Since there may be impurity particles, protruding tips and other defects in the PDLC film 200, the PDLC film 200 may be broken down and blackened or burnt at the defect position when high voltage is applied, i.e. a burst point is formed. It should be noted that when the positive pole of the power supply 800 is connected with the first copper foil sheet 240, the negative pole is connected with the second conductive layer 220; when the positive pole of the power supply 800 is connected with the second copper foil sheet 260, the negative pole is connected with the first conductive layer 210. Optionally, the power supply 800 can be a direct current power supply 800 or an alternating current power supply 800, which is not limited in the embodiment.

[0069] In the high voltage electrification process, if there is no electrode, it is difficult to ensure the power supply of the whole surface of the PDLC film only by point contact. In the electrification process, the electric charge cannot enter the inside of the PDLC film stably and efficiently; the conductive structure formed by the cooperation of the copper foil and the insulating magnet realizes temporary electrical connection, so that it is possible to test the defects of the PDLC film in advance.

[0070] In order to obtain the images of the defect areas at different positions, the image detection component 700 is arranged around the inspection platform 100, for photographing the surface of the PDLC film 200. Optionally, since the size of the PDLC film 200 is large, the image detection component 700 in the embodiment of the application can be multiple, so as to photograph the surfaces of the PDLC film 200 at different areas. Optionally, the image detection component 700 can also be installed above the inspection platform 100, and is driven to move by the transmission assembly to photograph the defects at different areas of the film. Optionally, the image detection component 700 can be a CCD image sensor, so as to improve the image accuracy and the detection accuracy of the defect position.

[0071] In order to realize the generation and position confirmation of the defect area (the present embodiment takes the burst point defect as an example for illustration), the present embodiment electrically connects the control module 1000 with the power supply 800 and the image detection component 700, the control module 1000 is used to control the opening or closing of the power supply 800 (the control module 1000 acts as the switch of the power supply 800), the power supply 800 can be opened to realize the application of the preset voltage to the PDLC film material 200, so that the defect area in the PDLC film material 200 forms a burst point, and the image detection component 700 is controlled to acquire the image information of the burst point, and the corresponding coordinate position of the defect area is determined and stored according to the image information of the burst point, so as to avoid the defect area in subsequent cutting. The coordinate position of the defect area (burst point) can be determined according to the relative position of the image of the burst point relative to the image of the whole PDLC film material 200 (background), and by establishing a coordinate system, the specific coordinate position can be determined; the center of the PDLC film material 200 or a certain corner of the PDLC film material 200 can be taken as the origin of the coordinate system to establish the coordinate system.

[0072] Optionally, the control module 1000 in the embodiment of the present application can be a programmable logic controller (PLC), which can be suitable for industrial control, can adapt to various working conditions, has high control precision and stability.

[0073] The PDLC film material pre-detection system provided by the present embodiment can connect the power supply 800 to the PDLC film material 200 pre-provided with a copper foil sheet, apply a preset voltage to the PDLC film material 200 by controlling the power supply 800, so as to expose the defects in the film material before cutting, and take pictures of the image of the defect area by the image detection component 700, so as to acquire the relative position of the defect area in the whole film plane, and then acquire the coordinate position of the defect area, so as to avoid the defect area in subsequent cutting, and avoid the waste caused by detecting the defective product after the conductive silver paste is prepared, that is, the pre-detection of the PDLC film material 200 is beneficial to cost saving.

[0074] Optionally, the PDLC film material pre-detection system further comprises a code spraying marking component 500, which is movably installed on the inspection platform 100.

[0075] Specifically, the control module 1000 is electrically connected with the code spraying marking component 500, and is used to control the code spraying marking component 500 to spray and mark the defect area according to the pre-stored coordinate position, that is, the code spraying marking component 500 automatically moves to the corresponding position for code spraying marking according to the coordinate of the defect area, so as to mark the defect position, so as to avoid the defect position in subsequent cutting, and avoid the flow of defective materials into subsequent processes to cause greater material waste.

[0076] In some embodiments, in order to obtain the burst point image and the code marking above the inspection platform 100, the PDLC film front detection system further comprises a longitudinal guide rail 400 and a movable support frame 300. The longitudinal guide rail 400 is arranged on both sides of the inspection platform 100 along the length direction of the inspection platform 100, that is, one longitudinal guide rail 400 is arranged on each side of the inspection platform 100 along the length direction, and the lower end of the movable support frame 300 is provided with a sliding block which is slidably connected with the longitudinal guide rail 400 and is driven by a first driving component 300a.

[0077] Further, the movable support frame 300 comprises a transverse support 310 which is arranged above the inspection platform 100 along the width direction of the inspection platform 100, that is, the transverse support 310 is arranged above the inspection platform 100 along the width direction of the inspection platform 100. A transverse guide rail is arranged on the transverse support 310, and the transverse guide rail is arranged on the side or bottom edge of the transverse support 310. A mounting assembly 311 which can slide along the width direction of the inspection platform 100 is arranged on the transverse guide rail. The mounting assembly 311 is also slidably connected with the transverse guide rail through a sliding block and is driven by a second driving component 310a.

[0078] The code marking component 500 is fixed on the mounting assembly 311, and the control module 1000 is electrically connected with the first driving component 300a and the second driving component 310a respectively, so as to drive the code marking component 500 to move according to the coordinate position of the defect area determined in advance, thereby realizing code marking of each defect area.

[0079] Optionally, the first driving component 300a and the second driving component 310a are both linear motors, which have high transmission efficiency and positioning accuracy and are convenient for accurate code marking.

[0080] In some embodiments, in order to facilitate automatic installation of the copper foil and the insulating magnetic strip, the PDLC film front detection system further comprises an adsorption assembly 600 and a mechanical arm 900.

[0081] The adsorption assembly 600 is installed on the mounting assembly 311 and is used for adsorbing the base material layer of the PDLC raw film material (the base material layer can be understood as a layer of insulating material attached to the first conductive layer 210, which is used for protecting the conductive material below and facilitating adsorption). For example, the adsorption assembly 600 comprises a plurality of adsorption units 610 which are arranged on the mounting assembly 311 and are used for adsorbing the base material layer of the PDLC raw film material. Figure 3As shown, the PDLC raw film material is divided into a coating area in the middle area and a non-coating area in the edge area according to the area, and the PDLC raw film material comprises a first substrate layer, a first conductive layer 210, a PDLC layer 230, and a second conductive layer 220, a second substrate layer arranged from top to bottom, the coverage of the first conductive layer 210 and the second conductive layer 220 is greater than the coverage of the PDLC layer 230, so that the first conductive layer and the second conductive layer in the edge non-coating area are attached, thereby completely covering the PDLC layer in the middle coating area. Among them, the first substrate layer and the second substrate layer are not shown in Figure 3 and Figure 4 .

[0082] The mechanical arm 900 is arranged on both sides of the inspection platform 100, and is used to pull up the edge first conductive layer 210 after the first substrate layer is adsorbed, so as to insert the first copper foil sheet 240, two first insulating magnetic attraction strips 250, the second copper foil sheet 260, and two second insulating magnetic attraction strips 270 into the preset position of the PDLC raw film material to form the PDLC film material 200 to be detected.

[0083] The embodiment can realize automatic loading of the copper foil sheet and the insulating magnetic attraction strip by arranging the adsorption assembly and the mechanical arm, which is beneficial to improve the preloading efficiency of the film material to be detected, thereby shortening the time of the whole detection process, and the automatic equipment can also be provided with a positioning assembly, which is used to confirm the loading position of the copper foil sheet and the insulating magnetic attraction strip, thereby improving the loading accuracy.

[0084] In some embodiments, the width of the first insulating magnetic attraction strip 250 is greater than the width of the first copper foil sheet 240; the width of the second insulating magnetic attraction strip 270 is greater than the width of the second copper foil sheet 260, that is, the copper foil sheet is completely covered by the corresponding insulating magnetic attraction strip, which is beneficial to ensure the insulation effect and the adsorption stability, and is convenient for improving the detonation effect after a preset voltage is applied. It should be noted that the width in the embodiment refers to the horizontal direction in Figure 3 .

[0085] Optionally, the first and second insulating magnetic strips 250 and 270 are rubber soft magnetic strips, which have certain flexibility and can adapt to the structure of the film material when inserted into the film material. Rubber has insulating properties, which can prevent short circuit between the first and second conductive layers 210 and 220, and the cost is not high. The soft magnetic strip is used to support the conductive layers on both sides of the interval, and the two conductive layers are separated to avoid short circuit when electrified. At the same time, through the insulating effect of the rubber soft magnetic strip, the conductive layer is isolated from the copper foil or other excellent conductive film layer and the PDLC layer, avoiding short circuit of the electric conduction, and the copper foil directly contacts the PDLC layer, which changes the thickness of the PDLC layer between the conductive layers (for example, the copper foil connected to one side of the conductive layer contacts the side edge of the PDLC layer, which changes the voltage between the side edge of the PDLC layer and one side), resulting in a difference between the applied voltage and the actual time voltage between the PDLC polymer liquid crystal layer of the two conductive layers (mainly caused by the distance difference between the two layers), which further causes false detection when detecting the defects of the PDLC pre-cut film.

[0086] In some embodiments, the total thickness of the first insulating magnetic strip 250 and the first copper foil sheet 240 between the first and second conductive layers 210 and 220 is within 2 microns of the thickness of the PDLC layer 230. In addition, the total thickness of the second insulating magnetic strip 270 and the second copper foil sheet 260 between the first and second conductive layers 210 and 220 is within 2 microns of the thickness of the PDLC layer 230.

[0087] In this embodiment, the thickness of the copper foil and the soft magnetic strip is approximately the same as the thickness of the polymer liquid crystal layer (the difference is within a small range, for example: 2 microns), which reduces the cutting parameter mismatch caused by the low edge liquid crystal layer thickness during the pre-cut film cutting process, causing cutting errors and affecting the film cutting size precision.

[0088] Optionally, since the defects are generally located inside the PDLC film 200, in order to improve the clarity of the burst point image, the PDLC film pre-detection system further comprises a light supplement assembly; the light supplement assembly is arranged on the moving support frame 300 and is used to supplement light when the image detection component 700 photographs the surface of the PDLC film 200.

[0089] Optionally, for the slow discharge release defect mode, the preset voltage adopted by the power supply 800 is 1.5-3 times of the nominal voltage of the product, and the discharge voltage is 10-36V. Among them, the set discharge voltage is the voltage that can maintain the haze of the PDLC film at 50-80% when powered on, and the liquid crystal layer of the PDLC film is in an incomplete turning state at this voltage, which is beneficial to expose some coating defects, thereby avoiding the defect film from flowing into the subsequent production, and the screening in the pre-cutting stage can reduce the waste of production equipment, materials and personnel costs.

[0090] Based on the same inventive concept, the embodiments of the present application also provide a PDLC film material pre-detection method based on the PDLC film material pre-detection system as in the above embodiments, as shown in the figure, the PDLC film material pre-detection method comprises the following steps S100-S300: Figure 5

[0091] S100, place the PDLC film material 200 to be detected on the inspection platform 100 and adsorb and fix.

[0092] Optionally, the copper foil and the insulating magnetic attraction sheet in the PDLC film material 200 can be prepared in advance on the inspection platform 100 or arranged in advance on other equipment, and this step is not limited.

[0093] S200, test the defect area after applying a preset voltage to the PDLC film material 200.

[0094] Specifically, by applying high voltage or regular voltage and slow discharge to the PDLC film material 200, different defect conditions in the film material form burst points, which facilitates subsequent determination of the specific position of the burst points through the image of the burst points.

[0095] S300, acquire image information of the defect area, and determine the coordinate position corresponding to the defect area according to the image information of the defect area.

[0096] Specifically, the image information of the burst points is acquired by the image detection component 700, that is, the image of the burst points in the entire PDLC film material 200 is recorded, and the position of the burst points in the entire PDLC film material 200 can be determined according to the image information of the burst points, such as: the distance of the burst points to the edge of the PDLC in different directions. The control module 1000 can take a corner of the PDLC film material 200 as the vertex of the coordinate system in advance, so as to acquire the coordinate information of each burst point, and store these coordinate information, which is convenient for subsequent marking or direct import into the cutting equipment for avoidance.

[0097] ​S400, code marking is performed on the defect area according to the coordinate position, a cutting scheme is determined for avoiding the defect area, the PDLC film material to be detected is cut into multiple pieces of PDLC product film, electrodes are prepared on the PDLC product film to obtain finished products, and the finished products are shipped after being tested without defects.

[0098] Specifically, the code marking part 500 is controlled to move to the corresponding defect position to perform code marking, so as to facilitate avoidance during subsequent cutting and ensure the quality of the film material. According to the position of the code marking, a specific avoidance cutting scheme (for example, an automatic cutting program) is executed, so that the whole piece of PDLC film material to be detected is cut into multiple small film pieces for subsequent electrode preparation. The PDLC film material pre-detection method provided in the embodiment of the present application exposes the defects in the film material before cutting by applying a preset voltage to the PDLC film material pre-provided with a copper foil piece, acquires an image of the defect area, determines the relative position of the defect area in the whole film plane, and then acquires the coordinate position of the defect area, so as to avoid the defect area during subsequent cutting and avoid waste caused by detecting the defective product after the conductive silver paste is prepared, which is beneficial to cost saving.

[0099] In some embodiments, as shown in Figure 6 S100 further includes:

[0100] S110, the PDLC raw film material is placed on the inspection platform 100 and is adsorbed and fixed.

[0101] Specifically, the PDLC raw film material is placed at a predetermined position of the inspection platform 100, and the raw material is adsorbed and fixed by the vacuum adsorption structure on the inspection platform 100 to avoid shaking. It should be noted that the PDLC raw film material here refers to the film material without electrode preparation, which only includes the first conductive layer, the PDLC layer 230 and the second conductive layer 220, that is, the film material structure before the electrode preparation.

[0102] S120, one side of the PDLC raw film material containing the first conductive layer 210 is adsorbed and pulled up.

[0103] Specifically, the edge of the first conductive layer 210 located at the uppermost layer is adsorbed and pulled up (specifically, adsorbed on the first substrate layer on the first conductive layer 210) by the adsorption assembly 600, so that the first conductive layer 210 located at the edge is separated from the second conductive layer 220, which facilitates subsequent installation of the copper foil piece and the insulating magnetic strip.

[0104] S130, the first copper foil piece 240, two first insulating magnetic strips 250, the second copper foil piece 260 and two second insulating magnetic strips 270 are inserted into the preset position of the PDLC raw film material to form the PDLC film material 200 to be detected.

[0105] Specifically, one of the first insulating magnetic attraction strips 250 and the first copper foil 240 is placed between the first conductive layer 210 and the second conductive layer 220 on one side by the mechanical arm, and the first copper foil 240 is located between the first insulating magnetic attraction strip 250 and the second conductive layer 220, and the other first insulating magnetic attraction strip 250 is placed on the side of the second conductive layer 220 away from the first copper foil 240, so that the first copper foil is fixed on the upper surface of the second conductive layer 220 (that is, the surface of the second conductive layer 220 close to the first conductive layer 210) by the two first insulating magnetic attraction strips 250. After the first insulating magnetic attraction strip 250 and the first copper foil 240 are placed, the adsorption assembly 600 can be released.

[0106] Similarly, one of the second insulating magnetic attraction strips 270 and the second copper foil 260 is placed between the first conductive layer 210 and the second conductive layer 220 on one side by the mechanical arm, and the second copper foil 260 is located between the second insulating magnetic attraction strip 270 and the first conductive layer 210, and the other second insulating magnetic attraction strip 270 is placed on the side of the first conductive layer 210 away from the second copper foil 260, so that the second copper foil is fixed on the upper surface of the first conductive layer 210 (that is, the surface of the first conductive layer 210 close to the second conductive layer 220) by the two second insulating magnetic attraction strips 270. After the first insulating magnetic attraction strip 250 and the first copper foil 240 are placed, the adsorption assembly 600 can be released, so that the assembly of the PDLC raw material film to the PDLC film 200 is completed.

[0107] Optionally, the copper foil and the insulating magnetic attraction strip can be assembled on both sides of the PDLC layer 230 at the same time as the cutting area by two groups of adsorption assemblies 600 and mechanical arms, so as to improve the assembly efficiency.

[0108] In some embodiments, as shown in Figure 7 and Figure 8 The S200 further includes:

[0109] S210, a preset high voltage is applied to the PDLC film to expose the explosion point defects;

[0110] The S300 further includes:

[0111] S310, image information of the explosion point defects is obtained, and a coordinate position corresponding to the explosion point defects is determined according to the image information of the explosion point defects.

[0112] Specifically, a preset high voltage is applied to the PDLC film, so that the defect position generates an explosion point. The principle of generating the explosion point can refer to the content of the foregoing embodiments, which will not be repeated here. The image information of the explosion point defects is obtained by the image detection component, and the specific coordinate position of the explosion point defects is determined.

[0113] In some embodiments, as shown in Figure 7 and Figure 8 for the coating trace type of defects, the S200 further comprises:

[0114] S220, slow discharging the PDLC film 200 to expose the coating defects.

[0115] and the S300 further comprises:

[0116] S320, acquiring image information of the coating defects, and determining coordinate positions corresponding to the coating defects according to the image information of the coating defects.

[0117] Specifically, the slow discharging exposes internal coating defects: the internal coating defects are identified by slow discharging of the power supply 800, and the coating trace type of defects is detected by low voltage (e.g. 10V-36V). The liquid crystal in the PDLC layer 230 does not fully turn under low voltage (i.e. the haze of the PDLC layer 230 remains at 50-80%), thereby exposing some coating defects. The image information can be acquired by the image detection component 700 (camera) to determine the positions of the coating defects.

[0118] Optionally, referring to Figure 7 and Figure 8 for the non-conductive foreign matter type of defects in the film, the S200 further comprises:

[0119] S230, applying normal voltage to the PDLC film 200 and slowly discharging to expose the non-conductive foreign matter.

[0120] and the S300 further comprises:

[0121] S330, acquiring image information of the non-conductive foreign matter, and determining coordinate positions corresponding to the non-conductive foreign matter according to the image information of the non-conductive foreign matter.

[0122] Specifically, for the non-conductive foreign matter in the film, the PDLC film 200 is normally powered (the power-on voltage makes the haze of the PDLC layer 230 remain at 50-80%) and then slowly discharged. The orientation of the liquid crystal in the PDLC layer 230 around the non-conductive foreign matter is different from that of the normal position, so it will show different recovery speeds from the overall area. The image information can be acquired by the image detection component 700 (camera) to determine the positions of the defects.

[0123] It should be noted that S210-S230 in step S200 only represent three different defect exposure manners, and do not represent the sequence of the three steps; similarly, S310-S330 in step S300 only represent three different defect exposure manners, and do not represent the sequence of the three steps.

[0124] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0125] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0126] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0127] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A PDLC film material pre-positioning detection system, characterized in that, The utility model relates to a kind of PDLC film material detection device, including: Inspection platform, for the PDLC film material to be detected is fixed, the PDLC film material to be detected includes first conductive layer, first copper foil, two pieces of first insulating magnetic strip, PDLC layer, second conductive layer, second copper foil, two pieces of second insulating magnetic strip;Wherein, the first copper foil and the second copper foil are clamped between the first conductive layer and the second conductive layer respectively, and are located at the two sides of the PDLC layer respectively, the first copper foil is clamped and absorbed on the upper surface of the second conductive layer by two pieces of the first insulating magnetic strip, and the second copper foil is clamped and absorbed on the lower surface of the first conductive layer by two pieces of the second insulating magnetic strip;The PDLC film material to be detected is not prepared electrode; Power supply, the power supply is alternating current power supply, two poles of the power supply are connected with the first copper foil and the second copper foil respectively, for the PDLC film material is applied with preset voltage; Image detection component, arranged at the periphery of the inspection platform, for shooting the surface of the PDLC film material; Control module, the control module is electrically connected with the power supply and the image detection component, for controlling the power supply to test the defect area after the PDLC film material is applied with preset voltage, and controlling the image detection component to obtain the image information of the defect area, and determining the coordinate position corresponding to the defect area according to the image information of the defect area and storing, to avoid the defect area when subsequent cutting; The PDLC film material to be detected is formed by inserting first copper foil, two pieces of first insulating magnetic strip, second copper foil, two pieces of second insulating magnetic strip into the preset position of PDLC raw film material;Wherein, PDLC raw film material includes first substrate layer, first conductive layer, PDLC layer, second conductive layer and second substrate layer arranged from top to bottom, the coverage of first conductive layer and the second conductive layer is greater than the coverage of the PDLC layer, resulting in the first conductive layer and the second conductive layer located in the edge non-coating area are attached, so that the PDLC layer in the middle coating area is completely covered.

2. The PDLC film pre-position detection system of claim 1, wherein, Further including: Code marking component, the code marking component is movably installed on the inspection platform; The control module is electrically connected with the code marking component, for controlling the code marking component to mark the defect area according to the coordinate position.

3. The PDLC film pre-position detection system of claim 2, wherein, Further including: Longitudinal guide rail and moving support frame; The longitudinal guide rail is arranged on both sides of the inspection platform along the length direction of the inspection platform, the lower end of the moving support frame is slidably connected with the longitudinal guide rail, and is driven by the first driving component; The moving support frame includes a transverse support that spans above the inspection platform, the transverse support is provided with a transverse guide rail, the transverse guide rail is provided with an installation assembly that can slide along the width direction of the inspection platform, and is driven by the second driving component. The ink-jet marking component is fixed on the mounting assembly, and the control module is electrically connected with the first driving component and the second driving component respectively, so as to drive the ink-jet marking component to move according to the coordinate position to mark the defect area.

4. The PDLC film pre-position detection system of claim 3, wherein, Further comprising: an adsorption assembly and a mechanical arm; The adsorption assembly is fixed on the mounting assembly and used for adsorbing the PDLC raw material film on the upper substrate layer; the mechanical arm is arranged on both sides of the inspection platform, and a clamping mechanism is arranged at the end of the mechanical arm and used for inserting the first copper foil, two first insulating magnetic strips, the second copper foil and two second insulating magnetic strips into the preset position of the PDLC raw material film through the clamping mechanism after the first substrate layer is adsorbed, so as to form the PDLC film to be detected.

5. The PDLC film pre-position detection system of claim 1, wherein, The width of the first insulating magnetic strip is greater than the width of the first copper foil; and / or the width of the second insulating magnetic strip is greater than the width of the second copper foil.

6. The PDLC film pre-position detection system of claim 1, wherein, The first insulating magnetic strip and the second insulating magnetic strip are both rubber soft magnetic strips.

7. The PDLC film pre-position detection system of claim 1, wherein, The total thickness of the first insulating magnetic strip and the first copper foil between the first conductive layer and the second conductive layer is within 2 microns of the thickness of the PDLC layer; The total thickness of the second insulating magnetic strip and the second copper foil between the first conductive layer and the second conductive layer is within 2 microns of the thickness of the PDLC layer.

8. The PDLC film pre-position detection system of claim 3, wherein, Further comprising: A light supplementing assembly is arranged on the moving support frame and used for supplementing light when the image detection component photographs the surface of the PDLC film.

9. The PDLC film pre-position detection system of claim 1, wherein, The preset voltage of the power supply is 1.5-3 times of the nominal voltage of the product; and / or the discharge voltage of the power supply is 10-36V.

10. A method for detecting the presence of a PDLC film based on the system for detecting the presence of a PDLC film according to any one of claims 2-9, wherein The PDLC film pre-detection method comprises: S100, placing the PDLC film to be detected on the inspection platform and adsorbing and fixing; S200, testing the defect area after a preset voltage is applied to the PDLC film; S300, acquiring image information of the defect area and determining the coordinate position corresponding to the defect area according to the image information of the defect area; S400, ink-jet marking the defect area according to the coordinate position; A cutting scheme is determined according to the defect area to avoid cutting, and the PDLC film to be detected is cut into multiple PDLC product films; electrodes are prepared on the PDLC product films to obtain finished products, and the finished products are shipped after being tested without defects; The S100 further comprises: S110, placing the PDLC raw material film on the inspection platform and adsorbing and fixing; S120, adsorbing and pulling up the side of the PDLC raw material film containing the first conductive layer; S130, inserting the first copper foil, two first insulating magnetic strips, the second copper foil and two second insulating magnetic strips into the preset position of the PDLC raw material film to form the PDLC film to be detected.

11. The method of claim 10, wherein the PDLC film is a polymer dispersed liquid crystal film. The S200 further comprises: S210, applying a preset high voltage to the PDLC film to expose the burst point defect; And the S300 further comprises: S310, image information of the burst point defect is acquired, and a coordinate position corresponding to the burst point defect is determined according to the image information of the burst point defect.

12. The PDLC film pre-positioning detection method of claim 10, wherein, The S200 further comprises: S220, the PDLC film material is slowly discharged to expose the coating defect; And the S300 further comprises: S320, image information of the coating defect is acquired, and a coordinate position corresponding to the coating defect is determined according to the image information of the coating defect.

13. The method of claim 10, wherein the PDLC film is a polymer dispersed liquid crystal film. The S200 further comprises: S230, the PDLC film material is applied with a normal voltage and slowly discharged to expose the non-conductive foreign matter; And the S300 further comprises: S330, image information of the non-conductive foreign matter is acquired, and a coordinate position corresponding to the non-conductive foreign matter is determined according to the image information of the non-conductive foreign matter.

Images