CN116818786A - Foreign matter detection device and method for optical film and optical film coating device - Google Patents
Foreign matter detection device and method for optical film and optical film coating device Download PDFInfo
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- CN116818786A CN116818786A CN202310707564.8A CN202310707564A CN116818786A CN 116818786 A CN116818786 A CN 116818786A CN 202310707564 A CN202310707564 A CN 202310707564A CN 116818786 A CN116818786 A CN 116818786A
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- G—PHYSICS
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/94—Investigating contamination, e.g. dust
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The application belongs to the technical field of foreign matter detection equipment, and particularly relates to a foreign matter detection device and method for an optical film and an optical film coating device. The foreign matter detection device is used for detecting foreign matters on an optical film and comprises a light source, a first polaroid, a second polaroid and an image acquisition device which are sequentially arranged, a detection space is reserved between the first polaroid and the second polaroid, an absorption axis of the first polaroid is perpendicular to an absorption axis of the second polaroid, the image acquisition device can acquire a white image or a black image under the condition that the optical film is positioned in the detection space, and the foreign matters can display black points in the white image and white points in the black image. The foreign matter detection device of the application can solve the problem that the foreign matter with the particle size below 10 μm on the optical film can not be detected at present.
Description
Technical Field
The application belongs to the technical field of foreign matter detection equipment, and particularly relates to a foreign matter detection device and method for an optical film and an optical film coating device.
Background
In the field of optical film coating, an automated optical inspection device (Automatic Optic Inspection, AOI) is commonly used to detect foreign matter on an optical film. In practical use, the particle size of the smallest foreign matter detectable by the automatic optical detection device is about 10 μm, that is, the automatic optical detection device cannot detect foreign matter having a particle size of 10 μm or less. When a foreign matter is present on the optical film, the optical film may be attached to an electronic device, or when another film layer is attached to the optical film, there is a possibility that the attachment may be defective such as foaming. However, how to detect foreign matters with a particle size of 10 μm or less on an optical film is a problem to be solved in the art.
Disclosure of Invention
An object of an embodiment of the present application is to provide a foreign matter detection device, method and optical film coating device for an optical film, which can solve the problem that the foreign matter with the particle size of less than 10 μm on the optical film cannot be detected at present.
In order to solve the technical problems, the application is realized as follows:
in a first aspect, an embodiment of the present application provides a foreign object detection apparatus for an optical film, for detecting a foreign object on the optical film, including a light source, a first polarizer, a second polarizer, and an image acquisition apparatus sequentially disposed,
a detection space is arranged between the first polaroid and the second polaroid, the absorption axis of the first polaroid is vertical to the absorption axis of the second polaroid,
in the case where the optical film is located in the detection space, the image acquisition device may acquire a white image or a black image, and the foreign matter may exhibit a black dot in the white image and a white dot in the black image.
In a second aspect, an embodiment of the present application provides a foreign object detection method for an optical film, which is applied to the above-mentioned foreign object detection device, and the foreign object detection method includes:
turning on a light source to irradiate the first polarizer;
starting an image acquisition device, and acquiring an acquired image through the image acquisition device;
and judging whether the optical film has foreign matters or not by collecting images.
In a third aspect, an embodiment of the present application provides an optical film coating apparatus, including the above-described foreign matter detection apparatus.
In the embodiment of the application, under the condition that the optical film is positioned in the detection space, an included angle is formed between the light absorption axis of the first polarizer and the slow axis of the optical film, the light source is started to irradiate the first polarizer, the light emitted by the light source can be converted into linear polarized light after passing through the first polarizer, and under the condition that the included angle is positioned in a preset range, the linear polarized light can be converted into circular polarized light or the linear polarized light can be kept unchanged after passing through the optical film.
Under the condition that light is converted into circularly polarized light after passing through the optical film, the circularly polarized light can pass through the second polaroid, so that the image acquisition device acquires a white image, if the optical film is provided with foreign matters, the foreign matters can cause damage to the optical film, the optical performance of the optical film can be changed, the light cannot be converted into circularly polarized light after passing through the optical film, and further, the white image is provided with black spots. Under the condition that linearly polarized light is kept unchanged after light passes through the optical film, the light absorption axis of the first polaroid is vertical to the light absorption axis of the second polaroid, so that the linearly polarized light cannot pass through the second polaroid, an image acquisition device can acquire a black image, if the optical film is provided with foreign matters, the foreign matters can cause damage of the optical film, the optical performance of the optical film can be changed, the linearly polarized light cannot be kept unchanged after the light passes through the optical film, and white spots are formed in the black image.
It can be seen that, after the image acquisition device acquires the white image or the black image, the foreign matter can be identified by identifying the black dot in the white image or the white dot in the black image, and the foreign matter can change the optical performance of the optical film no matter whether the particle size of the foreign matter is larger or smaller than 10 μm, so that the foreign matter detection device of the embodiment can identify the foreign matter with the particle size smaller than 10 μm.
Drawings
Fig. 1 is a schematic diagram of a foreign matter detection device for an optical film according to an embodiment of the present application;
fig. 2 is a flow chart of a foreign matter detection method for an optical film according to an embodiment of the present application.
Reference numerals illustrate:
100-light source, 200-first polaroid, 300-second polaroid, 400-image acquisition device and 500-detection space.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that some, but not all embodiments of the application are described. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The foreign matter detection device, the foreign matter detection method and the optical film coating device for the optical film provided by the embodiment of the application are described in detail below through specific embodiments and application scenes thereof with reference to the accompanying drawings.
As shown in fig. 1 to 2, an embodiment of the present application discloses a foreign object detection device for an optical film for detecting foreign objects on the optical film, including a light source 100, a first polarizer 200, a second polarizer 300, and an image acquisition device 400, which are sequentially disposed. Alternatively, the light source 100 may be an LED white backlight, and the image acquisition device 400 may be a camera; taking the orientation shown in fig. 1 as an example, the light source 100, the first polarizer 200, the second polarizer 300, and the image capturing device 400 are sequentially disposed from bottom to top.
A detection space 500 is provided between the first polarizer 200 and the second polarizer 300, and the absorption axis of the first polarizer 200 is perpendicular to the absorption axis of the second polarizer 300. Specifically, the optical film may pass through the detection space 500, and in the case that the optical film does not pass through the detection space 500, the light emitted by the light source 100 is converted into linearly polarized light by the first polarizer 200, and then the linearly polarized light cannot pass through the second polarizer 300 with the optical axis perpendicular to the optical axis of the first polarizer 200, and at this time, the image capturing device 400 may capture a black image.
In the case where the optical film is located in the detection space 500, the image acquisition device 400 may acquire a white image or a black image, and the foreign matter may exhibit a black dot in the white image and a white dot in the black image. Alternatively, the optical film may be an a-Plate film; the black point and the white point can be in the shape of a dot, a ring, a cloud and the like, and the application does not limit the shapes of the black point and the white point.
In the embodiment of the present application, when the optical film is located in the detection space 500, an included angle is formed between the light absorption axis of the first polarizer 200 and the slow axis of the optical film, the light source 100 is turned on to irradiate the first polarizer 200, the light emitted by the light source 100 can be converted into linear polarized light after passing through the first polarizer 200, and when the included angle is located in the preset range, the linear polarized light can be converted into circular polarized light or kept unchanged after passing through the optical film.
Under the condition that the light is converted into circularly polarized light after passing through the optical film, the circularly polarized light can pass through the second polarizer 300, so that the image acquisition device 400 acquires a white image, if the optical film is provided with a foreign object, the foreign object can cause damage to the optical film, the optical performance of the optical film can be changed, the light cannot be converted into circularly polarized light after passing through the optical film, and further, the white image is provided with black spots. Under the condition that the linearly polarized light is kept unchanged after the light passes through the optical film, the light absorption axis of the first polarizer 200 is perpendicular to the light absorption axis of the second polarizer 300, so that the linearly polarized light cannot pass through the second polarizer 300, and the image acquisition device 400 acquires a black image.
As can be seen, after the image acquisition device 400 acquires the white image or the black image, the foreign matter can be identified by identifying the black dot in the white image or the white dot in the black image, and the foreign matter can change the optical performance of the optical film no matter whether the particle size of the foreign matter is larger or smaller than 10 μm, so the foreign matter with the foreign matter detection device of the present embodiment can identify the foreign matter with the particle size smaller than 10 μm.
In an alternative embodiment, the image capturing device 400 may capture a white image under a condition that the slow axis of the optical film forms a first preset angle with the light absorption axis of the first polarizer 200, the first preset angle being 40 ° to 50 °. Optionally, the first preset included angle may be 42 °, 45 °, 48 °, and the specific value of the first preset included angle is not limited in the present application. If the first preset included angle is smaller than 40 ° or larger than 50 °, the obtained white image has gray scale, and when judging, the gray scale in the white image may be judged as a black point, thereby causing misjudgment. In this embodiment, the first preset included angle is controlled to be 40-50 degrees, so that the risk of misjudgment can be reduced.
In an alternative embodiment, the image capturing device 400 may capture a black image under a condition that the slow axis of the optical film forms a second predetermined angle with the light absorption axis of the first polarizer 200, the second predetermined angle being 0 ° to 5 °, or 85 ° to 95 °. Optionally, the second preset included angle may be 2 °, 4 °, or 87 °, 90 °, 92 °, or the like, and the specific value of the second preset included angle is not limited in the present application. If the second preset included angle is greater than 5 ° and less than 85 ° or the second preset included angle is greater than 95 °, the obtained black image has gray scale, and when judging, the gray scale may be judged as white point, thereby causing misjudgment. In this embodiment, the second preset included angle is controlled to be 0 ° to 5 ° or 85 ° to 95 °, so that the risk of misjudgment can be reduced.
After detecting the foreign matter on the optical film, the foreign matter-containing region of the optical film needs to be removed, and in order to facilitate removal of the foreign matter-containing region of the optical film, in an alternative embodiment, the foreign matter detection device further includes a marking device for marking the foreign matter on the optical film. The control system of the foreign matter detection device can acquire the position coordinates of the white point in the black image and the position coordinates of the black point in the white image, the position coordinates of the foreign matter on the optical film can be confirmed through the position coordinates of the black point and the white point, and the control system can control the marking device to mark the foreign matter on the optical film, so that the region of the optical film with the foreign matter can be conveniently removed.
In the above embodiment, the marking device marks all the areas with the foreign matter on the optical film, and in the case that the foreign matter detecting device of the present embodiment is combined with the automatic optical detecting device and the area with the foreign matter on the portion of the optical film has been marked according to the detection condition of the automatic optical detecting device, the marking device repeatedly marks the marked area of the optical film.
To avoid repeated marking, in an alternative embodiment, the foreign object detection device further includes an information recognition system in communication with the image acquisition device 400, the information recognition system configured to compare the marked area of the optical film with the area to be marked such that the marking device marks the foreign object that is not marked in the area to be marked. Specifically, the communication connection means that communication is formed between connected devices through transmission and interaction of signals, and can be divided into wired connection and wireless connection; wired connections are typically made through cables, optical fibers, or the like; the wireless connection is typically a connection through radio communication, bluetooth, infrared, NFC, etc. The region to be marked refers to all regions with foreign matter on the optical film determined according to the foreign matter detection device. In this embodiment, the information identifying system may compare the marked area with the area to be marked of the optical film, so as to confirm the unmarked area in the area to be marked, and further make the marking device mark only the foreign matter in the unmarked area, i.e. the marking device marks only the unmarked foreign matter in the area to be marked, so that the problem of repeated marking can be solved. It should be noted that, the marked area may be stored in the information recognition system in advance, or the automatic optical detection device may be communicatively connected to the information recognition system, so that the information recognition system obtains the marked area through the automatic optical detection device.
If the thickness of the adhesive layer is greater than 10 μm when the optical film is attached, it is not necessary to cut out the region of the optical film having only the foreign matter having a particle diameter of 10 μm or less, but the above-described embodiment may cut out all the regions of the optical film having the foreign matter, which may cause waste of the optical film.
In order to solve the problem of optical film waste, further, the first marking structure of the marking device for marking the unlabeled foreign matter can be made different from the second marking structure in the marked area. The two kinds of mark structures can be different in color, different in mark line type or different in mark shape. Specifically, taking the example that the minimum particle size of the foreign matters detectable by the automatic optical detection device is 10 μm, at this time, the second marking structure in the marked area is used for marking the foreign matters with particle size larger than 10 μm, after the information comparison, the first marking structure for marking the untagged foreign matters by the marking device is used for marking the foreign matters with particle size smaller than 10 μm, and the first marking structure and the second marking structure are different, so that the foreign matters with particle size smaller than 10 μm and larger than 10 μm on the optical film can be distinguished, and the area of the optical film only with the foreign matters with particle size smaller than 10 μm can be selectively reserved or cut off, thereby solving the problem of waste of the optical film. The above-mentioned automatic optical detection device is merely exemplary in that the minimum particle diameter of the foreign matter detectable by the automatic optical detection device is 10 μm, and the detection accuracy of the automatic optical detection device may be adjusted so that the minimum particle diameter of the foreign matter detectable by the automatic optical detection device is 15 μm, 20 μm, or the like.
In an alternative embodiment, the image acquisition device 400 may acquire a white image in the case that the first polarizer 200 is located at the first position; in the case where the first polarizer 200 is located at the second position, the image capturing device 400 may capture a black image. The first position is a position when a first preset included angle between the light absorption axis of the first polarizer 200 and the slow axis of the optical film is 40-50 degrees; the second position is a position when a second preset included angle between the light absorption axis of the first polarizer 200 and the slow axis of the optical film is 0 to 5 degrees, or 85 to 95 degrees.
The foreign object detection device further includes a rotation driving member connected to the first polarizer 200 to drive the first polarizer 200 to rotate between the first position and the second position. Alternatively, the rotary drive may be a motor, rotary cylinder, or the like. In this embodiment, the rotation driving member can drive the first polarizer 200 to rotate, so as to adjust the included angle between the light absorption axis of the first polarizer 200 and the slow axis of the optical film, and further enable the image acquisition device 400 to switch between acquiring a white image and acquiring a black image, so that the image acquisition device 400 can switch between acquiring a white image and acquiring a black image through the rotation driving member without manually adjusting the position of the first polarizer 200, thereby facilitating the operation of a user.
In an alternative embodiment, the rotation driving member is connected to the first polarizer 200 and the second polarizer 300, respectively, to simultaneously drive the first polarizer 200 and the second polarizer 300 to rotate. In this embodiment, the rotation driving member may be connected to the first polarizer 200 and the second polarizer 300 through a transmission mechanism, so as to achieve the purpose of driving the first polarizer 200 and the second polarizer 300 to rotate simultaneously, where the transmission mechanism may be a gear transmission mechanism, a belt pulley transmission mechanism, etc. The rotation driving member can simultaneously drive the first polarizer 200 and the second polarizer 300 to rotate, and the rotation angles of the first polarizer 200 and the second polarizer 300 are kept consistent, so that the light absorption axis of the first polarizer 200 and the light absorption axis of the second polarizer 300 can be kept vertical, and the position of the second polarizer 300 does not need to be independently adjusted after the position of the first polarizer 200 is adjusted. Of course, in addition to the present embodiment, a driving member may be further disposed to drive the second polarizer 300 to rotate.
In an alternative embodiment, the foreign object detection device further includes a first position detection device, where the first position detection device is used to detect the position of the first polarizer 200, the first position detection device is electrically connected to the rotation driving member, and in a case where the first polarizer 200 is located in the first position, the rotation driving member may be controlled to be in the closed state by the first position detection device. Alternatively, the first position detecting device may be a touch type detecting switch or an induction type detecting switch. In this embodiment, when the rotation driving member drives the first polarizer 200 to rotate to the first position, the first position detecting device may detect the first polarizer 200, and then the first position detecting device may control the rotation driving member to be in the off state, or the first position detecting device may control the rotation driving member to be in the off state through the control system, so that the first polarizer 200 is prevented from rotating beyond the first position, and further the white image obtained by the image obtaining device 400 is prevented from having a gray scale, so as to prevent the gray scale in the white image from being determined as a black point.
And/or, the foreign matter detection device further comprises a second position detection device, the second position detection device is used for detecting the position of the first polaroid 200, the second position detection device is electrically connected with the rotary driving piece, and the rotary driving piece can be controlled to be in a closed state through the second position detection device under the condition that the first polaroid 200 is located at the second position. Alternatively, the second position detecting device may be a touch type detecting switch or an induction type detecting switch. In this embodiment, when the rotation driving member drives the first polarizer 200 to rotate to the second position, the second position detecting device can detect the first polarizer 200, and then the second position detecting device can control the rotation driving member to be in a closed state, or the second position detecting device controls the rotation driving member to be in a closed state through the control system, so that the first polarizer 200 can be prevented from rotating beyond the second position, and further the black image obtained by the image obtaining device 400 is prevented from having gray scale, so that the gray scale in the black image is prevented from being determined as white point.
The embodiment of the application also discloses a foreign matter detection method for an optical film, which is applied to the foreign matter detection device in any embodiment, and comprises the following steps:
s100, turning on the light source 100 to enable the light source 100 to irradiate the first polarizer 200.
An included angle is formed between the light absorption axis of the first polarizer 200 and the slow axis of the optical film, the light source 100 is turned on to irradiate the first polarizer 200, light emitted by the light source 100 can be converted into linear polarized light after passing through the first polarizer 200, and under the condition that the included angle is in a preset range, the linear polarized light can be converted into circular polarized light after passing through the optical film or the linear polarized light is kept unchanged.
S200, the image acquisition device 400 is turned on, and the acquired image is acquired by the image acquisition device 400.
In case that the light is converted into circularly polarized light after passing through the optical film, the circularly polarized light may pass through the second polarizer 300, so that the image capturing device 400 captures a white image. In the case that the linearly polarized light is maintained after passing through the optical film, since the light absorption axis of the first polarizer 200 is perpendicular to the light absorption axis of the second polarizer 300, the linearly polarized light cannot pass through the second polarizer 300, so that the image acquisition apparatus 400 acquires a black image. The acquired image is a white image or a black image.
S300, judging whether the optical film has foreign matters or not by collecting images.
If the optical film has a foreign matter, the foreign matter may cause damage to the optical film, which may change the optical performance of the optical film, so that the linearly polarized light emitted by the first polarizer 200 cannot be converted into circularly polarized light after passing through the optical film, and further, a white image has black dots; or the linearly polarized light emitted by the first polarizer 200 cannot be kept unchanged after passing through the optical film, so that the black image has white spots; the foreign matter presents a black spot in the white image and a white spot in the black image, so that whether the optical film has the foreign matter can be judged by judging whether the collected image has the black spot or the white spot.
As can be seen, after the image acquisition device 400 acquires the white image or the black image, the foreign matter can be identified by identifying the black dot in the white image or the white dot in the black image, and the foreign matter can change the optical performance of the optical film no matter whether the particle size of the foreign matter is larger or smaller than 10 μm, so the foreign matter with the foreign matter detection device of the present embodiment can identify the foreign matter with the particle size smaller than 10 μm.
Further, in step S200, the image obtaining device 400 is turned on, and the white image and the black image are obtained by the image obtaining device 400, and when judging, the foreign matter on the optical film can be judged by the black point in the white image and the white point in the black image together, so as to improve the accuracy of judging whether the foreign matter is on the optical film.
The embodiment of the application also discloses an optical film coating device which comprises the foreign matter detection device in any embodiment.
The foregoing embodiments of the present application mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in view of brevity of line text, no further description is provided herein. The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
Claims (10)
1. A foreign matter detection device for an optical film for detecting foreign matters on the optical film is characterized by comprising a light source (100), a first polaroid (200), a second polaroid (300) and an image acquisition device (400) which are sequentially arranged,
a detection space (500) is arranged between the first polaroid (200) and the second polaroid (300), the light absorption axis of the first polaroid (200) is vertical to the light absorption axis of the second polaroid (300),
the image acquisition device (400) may acquire a white image or a black image in which the foreign matter may exhibit a black dot and a white dot in the black image, with the optical film being located within the detection space (500).
2. The foreign matter detection device for an optical film according to claim 1, wherein the image acquisition device (400) can acquire a white image in a case where a slow axis of the optical film makes a first preset angle with an absorption axis of the first polarizer (200), the first preset angle being 40 ° to 50 °.
3. The foreign matter detection device for an optical film according to claim 1, wherein the image acquisition device (400) can acquire a black image in a case where a slow axis of the optical film makes a second preset angle with an absorption axis of the first polarizer (200), the second preset angle being 0 ° to 5 °, or 85 ° to 95 °.
4. The foreign matter detection device for an optical film according to claim 1, further comprising a marking device for marking a foreign matter on the optical film.
5. The foreign object detection device for an optical film according to claim 4, further comprising an information recognition system in communication with the image acquisition device (400), the information recognition system being configured to compare a marked area of the optical film with an area to be marked so that the marking device marks a foreign object that is not marked in the area to be marked.
6. The foreign matter detection device for an optical film according to claim 1, wherein the image acquisition device (400) can acquire a white image with the first polarizer (200) located at a first position; the image acquisition device (400) may acquire a black image with the first polarizer (200) in the second position;
the foreign matter detection device further comprises a rotary driving piece, wherein the rotary driving piece is connected with the first polaroid (200) so as to drive the first polaroid (200) to rotate between the first position and the second position.
7. The foreign matter detection device for an optical film according to claim 6, wherein the rotation driving member is connected to the first polarizer (200) and the second polarizer (300), respectively, to simultaneously drive the first polarizer (200) and the second polarizer (300) to rotate.
8. The foreign matter detection device for an optical film according to claim 6, further comprising a first position detection device for detecting a position of the first polarizer (200), the first position detection device being electrically connected to the rotation driving member, the rotation driving member being controllable to be in a closed state by the first position detection device in a case where the first polarizer (200) is located at the first position; and/or the number of the groups of groups,
the foreign matter detection device further comprises a second position detection device, the second position detection device is used for detecting the position of the first polaroid (200), the second position detection device is electrically connected with the rotary driving piece, and under the condition that the first polaroid (200) is located at the second position, the rotary driving piece can be controlled to be in a closed state through the second position detection device.
9. A foreign matter detection method for an optical film, characterized by being applied to the foreign matter detection device according to any one of claims 1 to 8, the foreign matter detection method comprising:
turning on a light source (100) such that the light source (100) irradiates the first polarizer (200);
starting the image acquisition device (400), and acquiring an acquired image through the image acquisition device (400);
judging whether the optical film has foreign matters or not through the acquired image.
10. An optical film coating apparatus comprising the foreign matter detection apparatus according to any one of claims 1 to 8.
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