KR101233106B1 - Inspection method for yarn down of rubbing cloth - Google Patents

Abstract

The present invention relates to a rubbing cloth inspection method for inspecting agglomeration and leakage, and more particularly, a portal lying horizontally along the outer surface of the rubbing roll within the protruding allowable width of the rubbing cloth portal in the rubbing cloth wound on the rubbing roll. It relates to a test method for checking the presence of.
The rubbing cloth inspection method for inspecting the bunching and tack of the present invention, the rotatable portion for rotatably roving the rubbing roll wound the rubbing cloth, and installed on the side of the rubbing roll to shoot the surface and tangential direction of the rubbing roll, respectively A first camera and a second camera, a front light emitter and a rear light emitter for irradiating light to a subject of the first and second cameras, and photographed images of the first and second cameras are received and analyzed; A rubbing cloth inspection method using an inspection device including a control device, comprising: placing a first camera to photograph a surface of the rubbing roll from a side of a rubbing roll rotatably coupled to a rotating part, and the first camera and a rubbing roll The front light emitting body is disposed so as to irradiate the photographing surface of the first camera therebetween, so that the light is focused on the rubbing cloth which is the subject of the first camera, and within the allowable protrusion range of the outer surface of the rubbing roll. Photographing the portal image of the portal image and obtaining a portal forming direction image of the rubbing cloth coupled with the coordinates of the rubbing roll; The second camera is disposed in the tangential direction of the outer surface of the rubbing roll, and the rear light emitting body is disposed so as to irradiate the subject of the second camera so that light irradiation is performed while the tangential image of the rubbing roll is photographed and combined with the coordinates of the rubbing roll. Obtaining a portal projection length image of the rubbing cloth; An analysis step of determining whether an abnormality of the portal is determined by receiving the portal forming direction image and the portal projection length image by inputting the control device; And a determination step of determining whether or not the portal image is determined as abnormal in the portal formation direction image and determining that it is normal in the portal projection length image in preparation for the two image analysis information.
In addition, in the analysis step, the contrast area in which the contrast difference is generated in the portal formation direction image is determined to be an abnormal area. Next, the analysis step determines the abnormal area in the analysis information of the portal formation direction image. In the protruding length image, if it is determined to be normal, a bunching judging step of judging as bunching may be further performed.

Description

Rubbing cloth inspection method to check the bunching and leaking {INSPECTION METHOD FOR YARN DOWN OF RUBBING CLOTH}

The present invention relates to a rubbing cloth inspection method for inspecting agglomeration and leakage, and more particularly, a portal lying horizontally along the outer surface of the rubbing roll within the protruding allowable width of the rubbing cloth portal in the rubbing cloth wound on the rubbing roll. It relates to a test method for checking the presence of.

In general, an alignment process is performed to align liquid crystal molecules of a liquid crystal display panel.

As the orientation treatment method, a method of rubbing the surface of an alignment film with a rubbing cloth using a rubbing device formed by winding a rubbing cloth around a rotating rubbing roll is used.

Such a rubbing device is configured to rotate a rubbing roll formed by adhering a rubbing cloth to an outer circumferential surface of a roller made of aluminum or stainless steel so as to rub the surface of the alignment film while the rubbing cloth is in contact with the surface of the alignment film. Liquid crystal molecules are arranged to have uniform characteristics.

However, the rubbing cloth used in such a rubbing device is generally used velvet with the fabric and fibers raised, the length of the brush itself is bad, or when the long time use of the rubbing cloth, fluff from the rubbing cloth or rubbing cloth Due to its elasticity, the rubbing cloth is distorted, or a defect is caused by a factor in which foreign matter adheres to the rubbing cloth. The defect of the rubbing cloth may damage the surface of the liquid crystal display panel oriented by the rubbing cloth, resulting in a defect of the liquid crystal display panel.

In order to solve these drawbacks, the rubbing cloth is inspected from time to time, but the usual rubbing cloth inspection method is only a visual inspection, and thus a fine defect of the rubbing cloth cannot be found, thereby increasing the defective rate of the liquid crystal display panel.

Therefore, the present applicant has applied for a rubbing cloth defect removal device that can automatically detect the rubbing cloth strands caused by the baffle of the rubbing cloth and also automatically remove the rubbing cloth strands. (Korean Patent Application 10-2008- 0009763)

The conventional application is to remove and measure the baffle, foreign matter and squeaky strands of the rubbing cloth using a plurality of cameras, the first camera of the plurality of cameras to shoot in the direction of the axial center of the rubbing roll The portal width was measured, and another camera was photographed in the tangential direction of the rubbing roll to photograph the projecting cross section of the rubbing cloth wound on the rubbing roll. That is, the gap and the baffle of the portal are detected by the image pickup obtained from the first camera, and the peep portal protruding beyond the allowable value is detected by the other camera to remove the baffle and the beep portal by the forceps of the removal means.

However, the conventional inspection is to remove and remove the squeezing portal and the baffle protruding beyond the allowable value, it was not detected as a failure when the portal lying within the allowable protrusion length of the rubbing cloth while having a length longer than the allowable.

For example, the lying portal having the abnormal length and which is not detected and lying down is in contact with the liquid crystal surface in the alignment process so that the liquid crystal surface is dug to form a bend. Such bending causes the image to be distorted, thereby acting as a factor of degrading the quality of the liquid crystal display panel.

Therefore, it is necessary to study a leak test method that can improve the quality of the liquid crystal display panel by determining the presence of the leak portal.

The rubbing cloth inspection method for checking the agglomeration and leakage according to the present invention,

The liquid crystal display panel examines the surface of the rubbing cloth rolled up on the rubbing roll and examines the leaky portals lying on the side of the rubbing cloth base from the base of the rubbing cloth and having more than the allowable length such as squeaking. An object of the present invention is to provide an inspection method capable of minimizing orientation defects.

In another aspect, the present invention is to examine the agglomeration of the normal length of the portal is lying close to the adjacent portal and agglomeration.

Rubbing cloth inspection method for checking the bunching and leakage of the present invention for solving the above problems,

A rotating part for rotatably arranging a rubbing roll on which a rubbing cloth is rolled, a first camera and a second camera positioned on a side of the rubbing roll and installed to photograph a surface and a tangential direction of the rubbing roll, respectively, and the first camera In the rubbing cloth inspection method using an inspection device including a front and rear light emitter for irradiating light to the subject of the second camera, and a control device for receiving and analyzing the captured image of the first camera and the second camera. The first camera is disposed to photograph the surface of the rubbing roll on the side of the rubbing roll rotatably coupled to the rotating part, and the front light emitter is disposed to irradiate the photographing surface of the first camera between the first camera and the rubbing roll. Rubbing is combined with the coordinates of the rubbing roll by taking a picture of the portal image within the allowable protrusion range of the outer surface of the rubbing roll while focusing light on the rubbing cloth that is the subject of the first camera. Obtaining a portal formation direction image of the; The second camera is disposed in the tangential direction of the outer surface of the rubbing roll, and the rear light emitting body is disposed so as to irradiate the subject of the second camera so that light irradiation is performed while the tangential image of the rubbing roll is photographed and combined with the coordinates of the rubbing roll. Obtaining a portal projection length image of the rubbing cloth; An analysis step of determining whether an abnormality of the portal is determined by receiving the portal forming direction image and the portal projection length image by inputting the control device; And a determination step of determining whether or not the portal image is determined as abnormal in the portal formation direction image and determining that it is normal in the portal projection length image in preparation for the two image analysis information.

As described in detail above, the rubbing cloth inspection method for checking the agglomeration and leakage of the present invention,

Take images of the surface and protrusion length of the rubbing cloth rolled up on the rubbing roll, respectively, such as squeezing, above the allowable length, normal length, or short length, or have a group of sides to protrude from the base of the rubbing cloth. By examining the lying portals, the alignment of the LCD panel can be minimized.

In addition, it is possible to provide a useful method to further reduce the failure rate by examining the agglomeration in which the portal of the normal length lay and agglomerate adjacent to the adjacent portal.

1 and 2 is a schematic view showing a rubbing roll and rubbing cloth inspection apparatus of the present invention.
Figure 3 is a block diagram showing the process of a rubbing cloth leak test method according to an embodiment of the present invention.
Figure 4 is a schematic diagram showing a rubbing cloth portal example according to an embodiment of the present invention.
Figure 5 is a schematic diagram showing an example of agglomeration of the rubbing cloth portal according to another embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. It should be understood, however, that the appended drawings illustrate only the contents and scope of technology of the present invention, and the technical scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the technical idea of the present invention based on these examples.

First, a schematic description of a rubbing cloth inspection apparatus for performing the agglomeration and leakage test method of the present invention, as shown in FIGS. 1 and 2, the rubbing cloth inspection apparatus 10 wraps a rubbing cloth 90 on an outer surface thereof. It comprises the rotating part 20 arranged to support the rotation of the rubbing roll 80.

The first camera 30 and the second camera 40 are disposed on the side of the built-up rubbing roll, so that three-axis movement is possible by the moving means. The first camera 30 faces the surface of the rubbing roll, and the second camera 40 is positioned in the tangential direction of the lowest end of the rubbing roll so that the portal 92 of the rubbing cloth 90 wound on the rubbing roll To shoot. Here, the first camera and the second camera are for measuring the surface and the portal protrusion length of the rubbing cloth, respectively, as shown in addition to the horizontal arrangement can be rotated about the axis of the rubbing roll so that the installation position can be changed have. In addition, the image acquisition of the front surface of the rubbing cloth is obtained by rotating the rubbing roll while photographing a predetermined area of a predetermined width with a camera to obtain an outer surface of the rubbing cloth of a predetermined width, and then moving the camera in the axial direction of the rubbing roll. Acquisition is made through a method of acquiring an outer surface image of a rubbing cloth of another region adjacent to an image.

In addition, the front light emitting body 50 is disposed between the first camera 30 and the rubbing roll 80 to be coaxial with the first camera to irradiate light onto the subject, and to the rear of the subject of the second camera 40. The rear light emitter 60 is disposed to allow light to be irradiated. Since the front light emitting body is positioned in the same direction as the first camera with respect to the rubbing roll as the subject, the front light emitting body is formed in the form of a ring or polygonal ring formed with a through hole to irradiate light without disturbing the shooting of the first camera. In addition, a plurality of light emitting means such as an LED is installed inside the ring so that light is irradiated toward the subject. In this case, since the rubbing roll is formed in a curved surface, various methods may be applied, such as adjusting the spacing of the light emitting means to irradiate the same light on the curved surface. In addition, the front light emitter may emit light to the subject of the first camera in various directions in addition to the coaxial installation as shown, and the rear light emitter may be second in various directions such as the lower side of the subject other than the back of the subject of the second camera. The subject of the camera may be irradiated with light.

In addition, each part including the first camera and the second camera is connected to the control device 70 to transmit the captured image and to control the operation of each part. The control device includes a central processing unit for analyzing or calculating a required image from the received image, and various DBs, input / output units, RAM, and the like.

In the rubbing cloth inspection method using the rubbing cloth inspection apparatus, a rubbing roll joining step of accumulating a rubbing roll in which a rubbing cloth is wound on the rotating part is performed, as shown in FIG. 3.

When the combining of the rubbing roll is completed, the portal acquisition direction image acquisition step of the rubbing cloth is performed. In this step, the first camera 30 positioned on the side of the rubbing roll is used to photograph the surface of the rubbing cloth 90 rolled up on the roving roll, and in front of the photographing area of the rubbing cloth which is the subject in order to obtain a clear image. The light emitted from the light emitter 50 is concentrated to be irradiated. In particular, the photographing is performed by capturing the portal image by focusing within the allowable protrusion range of the portal to acquire the portal formation direction image within the allowable protrusion range.

In addition, the acquired image information is combined with the coordinate information of the rubbing roll to facilitate the contrast in the steps described below. For reference, the method of applying the coordinates may be applied to various methods such as calculating the coordinate values that are moved while considering the rotation angle of the rubbing roll and combining the coordinates with the image.

Next, the portal projection length image acquisition step of the rubbing cloth is performed. This step is a step of photographing the protruding length of the portal 92 protruding from the base 91 portion of the rubbing cloth 90 using the second camera 40 arranged in the tangential direction of the outer surface of the rubbing roll. That is, since the second camera is located in the tangential direction of the rubbing roll, an image of an acceptable reference line may be obtained by measuring the thickness (protrusion length) of the rubbing cloth that is outward from the surface of the rubbing roll. The rear light emitter 60 is disposed at a portion of the rubbing cloth, which is the subject, to face the second camera 40 so that light irradiation can be performed to photograph the protruding length of the portal. In addition, the coordinate information is combined in the portal projection length image so that contrast is made for the same portion as the portal formation direction image obtained in the previous step. At this time, the range of the allowable reference line in the protruding length of the portal range includes the sum of the lengths considering the error due to the rotation at the protruding end of the normal portal, or the range including the sum of the lengths considering the error due to the rotation from the base within the normal portal. Can be.

An analysis step of determining whether an abnormality of the portal is performed by analyzing the portal formation direction image and the portal projection length image obtained in the above step is inputted and analyzed.

As shown in FIG. 4, except for the rayon cloth, the rubbing cloth has a form in which the roots of the portals are coupled to the base of most cloths such as hyper cloth and cotton cloth. These portals may be combined one by one, or a plurality of them may be combined to form a group, and may be considered as one of the determination conditions to set the allowable width when determining whether to be located within the width.

As shown in the drawing, the portal (a part) of the normal rubbing cloth is displayed with a predetermined width w in the portal formation direction image.

In FIG. 4, the portal of b has a length protruding beyond the allowable height, but in the portal formation direction image, the portal is indicated to be normal by being displayed with the same width w1 as the width w of the normal portal. On the other hand, the portal of c protrudes above the allowable height and lies on the side, and is measured as the width (w2) longer than the width of the normal portal in the portal formation direction image. In addition, the portal of d has a length longer than that of the normal portal, but lies within the side while being positioned within the allowable height, and is displayed as a width (w3) longer than the normal portal width (w) in the portal formation direction image. Accordingly, in the portal image forming direction image analysis, the coordinates of the image having a width out of its range are detected based on the set width of the normal portal. For example, in the drawing, a and b can be treated as normal, and c and d can be discriminated as a defective abnormal portal. In addition, the reference range may further include a precision control step of adjusting the precision of the detection target detection by setting and adjusting the error range.

Meanwhile, in the portal projection length image, the reference value of the allowable projection length is set to include a predetermined error range and is indicated by a dotted line in FIG. 4. In the case of a in the normal portal 4 is located within the allowable protrusion length is not detected. In the case of spiking (b, c), it is detected as out of the allowable protrusion length and is determined as an abnormal portal. However, in the case of a leaking portal (d) that is squeaking and lying within the allowable protrusion length, it is determined as a normal portal.

When determining the portal formation direction image and the portal projection length image, the contrast can be clearly contrasted by adjusting the contrast. This adjustment may be applied to various methods other than the concrete, such as removing a certain color sequentially so that only the required color range appears.

Next, a leak determination step of determining whether or not leakage is performed in comparison with the analyzed portal formation direction image information and portal projection length image information is performed. In this step, by comparing the coordinates of the two image information to determine whether or not to determine whether the portal portal direction direction image information in the same coordinate was determined as an abnormal portal, portal projection length image information is determined to be a portal portal Provide final information.

For example, in the case of the normal portal (a) of FIG. 4, normal discrimination is made in both images, and among the beeping portals (b, c, d), the beeping portal (b) having the same width as the normal portal is portal formation direction image information. Is determined to be normal, but portal portal length image information is determined to be an abnormal portal. Finally, it is determined that the bleeding is to be removed by the bleeding removing means. In addition, the other pimple portal (c) is determined as an abnormal portal in both the portal formation direction image information and the portal projection length image information, so this is also judged to be the final peep. Another squeezing portal (d) was identified as an abnormal portal in portal formation direction image information, but in portal projection length image information, it was determined as a normal portal. Information is provided by a leaky portal on the display.

Therefore, it is possible to confirm the presence of the leaking portal, it is possible to prevent the liquid crystal display panel from being dug during the alignment process by the final measure.

In addition, the present invention can also detect the aggregation of the portal on the basis of the measured image. The agglomeration is included in the quilting means the quilting formed in the portal length of the normal range. In other words, the agglomeration is a state in which the portals of the lying part are concentrated because the normal portal is lying in the direction in which the force is applied to the one side due to the external force and the poor binding, and then does not return to the original position.

The agglomeration is in a state in which the portal 92 having the normal length is inclined to one side and is densely packed within the normal width as shown in the example of FIG. 5. Such agglomeration does not have a long portal length, such as a squeaky portal or a stalk portal, so it does not appear as a line with an abnormal width in the portal formation direction image or as a protruding length in the portal projection length image. However, in the portal formation direction image, since a large number of portals are concentrated in a certain area, a difference occurs in contrast between other normal areas.

Therefore, in the analyzing step, it is possible to determine the abnormality of the portal and to measure the contrast difference due to the portal density. For example, in the portal image forming direction image, it is possible to determine whether there is an abnormality by checking the contrast region that differs from the contrast of the normal portal array by determining whether the region is greater than or equal to the set size (permissible region).

Another method of analyzing the clustering is to add a plurality of consecutive images and determine the afterimage. Since the rubbing cloth is wound around a circular roll, the portal is bent to one side by the roll as the measurement is made while rotating the roll.

That is, when the rubbing roll is rotated at a predetermined angle by a camera arranged in the rotational direction of the portal, the photographing is made, and the plurality of photographed images are combined.

In the summation of the multiple images, the normal straight portal does not change from side to side, but the portal image is clearly displayed. Appears as a dog. Therefore, it is possible to determine whether an abnormality (collapse) is determined by the sharpness of the portal image.

Next, the aggregation determination step of determining the aggregation may be further performed by comparing the analysis information (contrast region or sharpness) of the portal formation direction image and the analysis information of the portal projection length image. In the clustering determination step, the analysis information of the portal formation direction image is determined to be an abnormal region by contrast or sharpness, and when determined to be normal in the portal projection length image, it is determined to be clustering.

10: inspection device 20: rotating part
30: first camera 40: second camera
50: front light emitter 60: rear light emitter
70: control device 80: rubbing roll
90: Loving Can
91: Base 92: Portal

Claims (4)

Rotating part 20 for rotatably arranging the rubbing roll 80 in which the rubbing cloth 90 is wound, and a first camera positioned on the side of the rubbing roll and installed to photograph the surface and the tangential direction of the rubbing roll, respectively. 30) and the second camera 40, the front light emitting body 50 and the rear light emitting body 60 for irradiating light to the subjects of the first camera and the second camera 60, the first camera and the second camera In the rubbing cloth inspection method using the inspection device 10 including a control device 70 for receiving and analyzing the captured image,
The first camera is disposed to photograph the surface of the rubbing roll on the side of the rubbing roll rotatably coupled to the rotating part, and the front light emitter is disposed to irradiate the photographing surface of the first camera between the first camera and the rubbing roll. Photographing a portal image within an allowable protrusion range of an outer surface of the rubbing roll while focusing light onto a rubbing cloth that is a subject of the first camera to obtain a portal forming direction image of the rubbing cloth coupled with the coordinates of the rubbing roll;
The second camera is disposed in the tangential direction of the outer surface of the rubbing roll, and the rear light emitter is disposed to irradiate the subject of the second camera so that the light is irradiated while the tangential image of the rubbing roll is photographed and combined with the coordinates of the rubbing roll. Obtaining a portal projection length image of the rubbing cloth;
An analysis step of determining whether an abnormality of the portal is determined by receiving the portal forming direction image and the portal projection length image by inputting the control device;
And a determination step of determining whether or not it is a leakage when it is determined that the portal formation direction image is abnormal in contrast with the two image analysis information and the portal projection length image is normal.
The analyzing step is characterized in that the control device receives the portal forming direction image and the portal projection length image of the same portion by the coordinates of the rubbing roll,
In the analyzing step, by measuring the contrast region in which the contrast difference more than the allowable region in the portal image forming direction image is determined as the abnormal region,
Next, the analyzing step is determined by the abnormal region in the analysis information of the portal formation direction image, and determined in the portal projection length image is determined as a bunching step; Rubbing cloth inspection method further comprises. The method of claim 1,
The portal forming direction image and the portal projection length image in the analysis step, characterized in that the contrast of the image of the abnormal portal by contrast is clearly contrasted. The method of claim 1,
In the above analysis step
In the portal formation direction image, the portal having a length larger than the allowable portal width is measured to determine the abnormal portal.
A rubbing cloth inspection method, characterized in that the portal protruding length from the portal projection length is measured by measuring the protruding portal more than the allowable portal projection length. delete

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