KR101981394B1 - Apparatus for Testing Combination Real Time High Speed Using Color Image - Google Patents

Abstract

The high-speed real-time COF film composite inspection system using color images extracts color components from the inspection region of the COF film by using a color R (red) component, a color G (green) component, and a color B (blue) component, It is possible to increase the production speed of the product by increasing the promptness and accuracy of the defect type detection by automatically checking the goodness or the badness using the color component.

Description

[0001] The present invention relates to a high speed real time COF film composite inspection apparatus using color images,

More particularly, the present invention relates to an inspection apparatus for a display panel. More particularly, the present invention relates to an inspection apparatus for a display panel, Speed real-time COF film composite inspection apparatus using a color image that extracts color components using a color B component and automatically checks whether the color components are good or bad using the extracted color components.

In the display market, the growth of smartphones, tablet PCs, large-size LCD panels, and 3D TVs is explosive. In the case of display panels, the country is a strategic growth business. However, as the price competitiveness of the display market is worsening due to the narrowing gap in technology competitiveness among countries, the price competition for components used in display panels is causing competition.

However, lowering the cost of a component has reached its limit when considering the cost of raw materials for the part. Therefore, by inspecting the display panel and detecting defects, it is possible to reduce the manufacturing cost and the product reliability in the process.

Such a display panel uses COF (Chip On Film) technology, which is a surface mounting package of a semiconductor, which mounts a bare chip of a large-scale integrated circuit on a tape-like insulating film forming a lead wiring and connects to a lead.

Since the defect detection of the COF film is mostly performed by visual inspection, the error rate for the defect detection increases due to the lack of experts and the fatigue accumulation due to the long-time inspection, resulting in deterioration of product reliability and economical efficiency as well as degradation of product reliability .

The COF film is composed of a solder resist (SR) surface and a polyimide (PI) surface on which the substrate is printed.

Inspection items of COF film are chip inspection, marking inspection, pattern inspection on SR surface and damage inspection on PI surface.

The defect inspection of the existing COF film was carried out by manual inspection of the workers due to the diversity of the detection items and the characteristics of the product to be inspected.

Such manual inspections have resulted in a slowdown in the worker's work speed, an increase in work proficiency, an increase in work errors, and a general distrust of the product quality of the clients.

However, there is a problem in that the work standard can not be equally applied to the inspection due to the difference in capability of the individual workers.

In order to solve such a problem, the present invention is characterized in that both sides of a COF (Chip On Film) film are respectively photographed by a camera, and a check region of a COF film is defined as a color R component, a color G component, The present invention provides a high speed real time COF film composite inspection apparatus using a color image for extracting color components using blue components and automatically checking whether the color components are good or bad using the extracted color components.

According to an aspect of the present invention, there is provided an apparatus for inspecting a high-speed real-time COF film using color images,
An air slider unit supported on a support on a stage on the vibration absorbing member and for raising a COF film on a plate on which a discharge hole for air discharge and a suction hole for air suction are periodically formed;
A transfer member for fixing the COF film that is air floating on the air slider unit at one or both sides of the air slider unit and slidably transferring the COF film horizontally;
An upper camera for capturing images of the SR surface of the COF film;
A lower camera for photographing the PI surface of the COF film to acquire an image;
A PLC for controlling the movement of the transfer member installed on one or both sides of the air slider unit;
An image capturing unit for capturing an image of an upper camera and a lower camera and collecting the captured image;
An image processor for extracting a color R (Red) value, a color G (Green) value, and a color B (Blue) value from RGB values of a color image of the acquired upper camera and the lower camera 132;
A pattern generating unit for generating a signal pattern for applying a signal for operation of a substrate to a PCB attached to the COF film;
The inspection area is divided on the SR (Solder Resist) surface or the PI (Polyimide) surface and each inspection area is divided into color components R (red), G (green) And a control unit for performing a binarization process on the extracted color components and selecting a color component having the highest resolution among color components extracted from the respective inspection areas to determine a defect type,
When the lead is recognized in the InnerLead portion on the PI (Polyimide) plane, the control unit sets the position of the lead over three regions of interest (ROI), and the x and y coordinates of the center of the lead width Registers the reference image as a reference image, compares the read width of the input image with the x and y coordinates of the reference image based on the registered reference image, generates a shift amount of the lead to determine whether the product is good or defective ,
The vibration absorbing member is a device for absorbing the minute rotation and impact of the stage and the support,
A curved surface portion forming an opening of the housing;
A pillar member inserted into the opening of the curved surface portion and coupled to an upper portion of the pedestal;
A spherical circular sphere connected to an upper portion of the column member;
A seating part which receives and rotates a certain part of the circular sphere;
A support extending in the seating portion and formed in a straight line shape;
A spring member coupled to an upper end of the support;

And a guide member guiding the support member linearly reciprocated by the elasticity of the spring member and receiving the support member and the spring member.

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According to the present invention, the color image is acquired with respect to the inspection region of the COF film, and the color image is used to determine whether the inspection region is good or bad, thereby improving the promptness and accuracy of the defect type detection The production amount of the product is increased.

FIG. 1 is a block diagram of a high-speed real-time COF film composite inspection apparatus using a color image according to an embodiment of the present invention.
2 is a conceptual view of a COF film composite inspection apparatus according to an embodiment of the present invention.
3 is a block diagram briefly showing a configuration of a control apparatus according to an embodiment of the present invention.
4 is a view showing an example of distinguishing inspection regions according to an embodiment of the present invention.
5 is a view showing an example of inspection using a red component of a plating portion among inspection regions according to an embodiment of the present invention.
FIG. 6 is a diagram showing an example of a test using a green component of a pattern portion among inspection regions according to an embodiment of the present invention.
7 is a diagram showing a result of comparison between a gray image and a color image according to an embodiment of the present invention.
8 is a diagram illustrating an example of a reference image according to an embodiment of the present invention.
9 is a cross-sectional view showing a configuration of a vibration-absorbing member according to the first embodiment of the present invention.
10 is a cross-sectional view showing a configuration of a vibration absorbing member according to a second embodiment of the present invention.

Throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

FIG. 1 is a view showing a configuration of a high-speed real-time COF film composite inspection apparatus using color images according to an embodiment of the present invention. FIG. 2 is a schematic view of a COF film composite inspection apparatus according to an embodiment of the present invention, FIG. 3 is a block diagram briefly showing the configuration of a control apparatus according to an embodiment of the present invention. FIG. 4 is a diagram showing an example of distinguishing inspection areas according to an embodiment of the present invention, FIG. 6 is a view showing an example of inspection using a red component of a pattern portion among inspection regions according to an embodiment of the present invention, and FIG. 6 is a view showing an example of inspection using a green component of a pattern portion among inspection regions according to an embodiment of the present invention .

A high speed real time COF film composite inspection apparatus 100 using color images according to an embodiment of the present invention includes an air slider unit 110, a transfer member 120, an upper camera 130, a lower camera 132, 300 and a vibration-absorbing member 200, 400, respectively.

The air slider unit 110 is supported by a predetermined support 102 on a stage 101 on the vibration absorbing members 200 and 400 and includes a discharge hole 111 for air discharge and a suction hole 112 for air suction. And a COF film 103 is air-floated on the plate. A predetermined air pressure generating device (not shown) may be used to supply the air to the discharge hole 111, and a predetermined air pump (not shown) may be used to suck air from the suction hole 112.

The conveying member 120 fixes the COF film 103 that is air-floated on the air slider unit 110 at one or both sides of the air slider unit 110 and slidably feeds the COF film 103 to the left and right.

The upper camera 130 captures an SR (Solder Resist) surface of the COF film 103 to acquire an image, and the lower camera 132 captures an image of a polyimide (PI) surface of the COF film 103 .

The control device 300 includes a PLC (Programmable Logic Controller) 310, an image acquisition unit 320, an image processing unit 330, a pattern generation unit 340, a display unit 350, and a control unit 360.

The PLC 310 controls the movement of the transfer member 120 installed on one or both sides of the air slider unit 110.

The image acquisition unit 320 controls the shooting of the upper camera 130 and the lower camera 132 and the collection of the image acquisition.

The image processing unit 330 extracts a color R value, a color G value, and a color B value from the RGB values of the color images of the upper camera 130 and the lower camera 132.

The pattern generating unit 340 generates a signal pattern to apply a signal for operating the substrate to a PCB (Printed Circuit Board) (not shown) attached to the COF film 103.

The display unit 350 is a liquid crystal display (LCD) displaying a menu required for the control, or an image obtained by the upper camera 130 and the lower camera 132.

As shown in FIG. 4, the controller 360 divides the inspection area on the SR (Solder Resist) surface or the PI (Polyimide) surface. For example, in the SR surface, Extracts each color component using a color R (Red) component, a color G (Green) component, and a color B (Blue) component, and performs a binarization process on the extracted color component.

The control unit 360 selects a color component having the highest resolution among the color components extracted from the respective inspection regions to determine the defect type.

For example, as shown in FIG. 5, since the color R (Red) component of the color component of the plating unit has the highest resolution and it is easy to determine the defect type, the binarization process is performed using the color R (Red) Or the defective type.

For example, as shown in FIG. 6, since the color G (Green) component of the color component of the pattern portion has the highest resolution and it is easy to determine the defect type, the binarization process is performed using the color G (Green) Determine the type.

As described above, the present invention can increase the reliability and accuracy of the defect inspection by selecting an appropriate color among the color components in the inspection region.

As shown in Fig. 7, in the case of the gray image, since it is difficult for the operator to easily determine the type of defect, it takes much time to determine the failure and the accuracy may be lowered. In contrast, Since there is a vivid color in the area and the defect determination is performed using the corresponding color, the defect type can be detected quickly and accurately.

The defect inspection items of the COF film 103 according to the present invention include a foreign matter (lead portion), a foreign substance (chip backside), a foreign substance (backside PI), M / K other defects, SLIT bending, (A / M), resin bleed (resin), resin bleed, resin bubble, resin bubble, NO potting, other process failure, S / R other defect, plating discoloration S / R smearing, S / R foreign matter (conductive), S / R foreign matter (non-conductive) )to be.

Among these defect types, there are defects that must be judged by the color, and it is very difficult to distinguish the parts that need to distinguish colors such as plating discoloration by the Mono camera.

And the inner lead bonding defect for checking the attachment state of the chip on the PI (Polyimide) surface is checked.

When the lead is recognized in the InnerLead portion on the PI (Polyimide) plane, the controller 360 sets the position of the lead over three regions of interest (ROI), and the center of the lead width in each lead , and y coordinates, and registers it as a reference image as shown in FIG.

The control unit 360 compares the read width of the input image with the x and y coordinates of the center based on the registered reference image to generate a shift amount of the lead to determine whether it is a good product or a defective product.

The COF film composite testing apparatus 100 of the present invention has an advantage that simultaneous inspection of the SR (solder resist) surface and the inner reader portion can be performed.

The present invention adopts a non-contact type air lifting system as a technology for transporting a product having a flatness of 100 占 퐉 or less of the COF film 103. [

However, since the COF film 103 is a soft product, vibration or dislocation may occur, so that it is advantageous for defect inspection to minimize vibration.

9 and 10 below explain the structure of the vibration absorbing member 200, 400 of the present invention in detail.

9 is a cross-sectional view showing a configuration of a vibration-absorbing member according to the first embodiment of the present invention.

The vibration absorbing member 200 according to the first embodiment of the present invention is a device for absorbing the fine rotation and impact of the stage 101 and the support table 102, A curved surface portion 203 forming an opening of the housing 201 and a pillar member 216 inserted into an opening of the curved surface portion 203 and coupled to an upper portion of the pedestal 20, A spherical circular hole 215 connected to the upper portion of the column member 216 and a seating portion 214 receiving and rotating a predetermined portion of the circular hole 215; A spring member 212 coupled to an upper end of the support body 213 and a support member 213 which is linearly reciprocated by the elasticity of the spring member 212, And a guide member 210 for receiving the support member 213 and the spring member 212.

The seating part 214 may be formed in a concave hemispherical shape to enclose the sphere.

The seat 214 and the support 213 are pushed in the direction of compressing the spring member 212 and returned to their original positions by the repulsive force of the spring member 212.

The seat portion 214 holds the circular sphere 215 on the inner side, and the circular vibration absorbing member 200 along the inner rim is rotated by engaging the balls 215 against each other.

The housing 201 is rotated in accordance with the fine rotation of the circular hole 215 and the housing 201 is compressed to the repulsive force of the spring member 212. Then, do.

10 is a cross-sectional view showing a configuration of a vibration absorbing member according to a second embodiment of the present invention.

In the second embodiment of the present invention, a plurality of shock absorbing members 400 are formed on the lower surface of the stage 101 to absorb an external impact.

The impact absorbing member 400 according to the embodiment of the present invention includes a cap portion 401 coupled to a lower surface of the stage 101 and a first impact control member 410 coupled to a lower portion of the cap portion 401 A second shock control member 420 coupled to a lower portion of the first shock control member 410 and having a smaller diameter than the first shock control member 410, And a third impact control member 430 coupled to the second impact control member 420 and having a smaller diameter than the second impact control member 420.

The first shock control member 410 includes a first body 411 having a rectangular shape with a predetermined space formed therein and a first gear portion 413 along the inner edge of the first body 411 And a protrusion 412 protruding inward from the lower end of the first body 411.

The second impact control member 420 includes a second body 421 formed to be smaller than the diameter of the first impact control member 410 and slidably inserted through the lower end opening of the first impact control member 410, A second gear portion 422 is formed along an inner side edge of the second body 421 and an engaging member 423 is fixed to the protrusion 412 of the first impact control member 410 .

The gear member 423a is formed along the outer edge of the engaging member 423 so that the gear member is meshed with the first gear portion 413 and is engaged with the gear member 423a, 413, respectively.

The third impact control member 430 has a third body 431 formed to be smaller than the diameter of the second impact control member 420 and slidably inserted through the lower end opening of the second impact control member 420, A third inner gear portion 423 formed along the inner side edge of the third body 431 and a third outer gear portion 433 along the outer side edge.

The third outer gear portion 433 of the third impact control member 430 is engaged with the second gear portion 422 and the third outer gear portion 433 is engaged with the second gear portion 422 .

A press member 440 is attached to the lower portion of the third impact control member 430 to apply an external force to the third impact control member 430.

The press member 440 is engaged with the pinion gears 433 and 434 on the third inner gear portion 433 of the third impact adjusting member 430 and is engaged with the pinion gears 433 and 434 on both sides A groove 442 formed at a predetermined depth in the upper center of the cylindrical housing 441; a pedestal 443 formed in a horizontal direction on the lower end surface of the cylindrical housing 441; And an upper central portion of the protrusion 443 protrudes upward.

The cylindrical housing 441 has a lower surface opened and the protruding portion 444 is inserted into the opening of the lower surface of the cylindrical housing 441 and the lower end surface of the cylindrical housing 441 is inserted into the pedestal 443 Which is sealed.

A spring member 445 is coupled to the inner space of the cylindrical housing 441 between the groove 442 and the upper surface of the protrusion 444.

The embodiments of the present invention described above are not implemented only by the apparatus and / or method, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

100: COF film composite inspection system
110: air slider unit
120:
130: upper camera
132: Lower camera
200, 400: vibration absorbing member
300: Control device

Claims (5)

An air slider unit supported on a support on a stage on the vibration absorbing member and for raising a COF film on a plate on which a discharge hole for air discharge and a suction hole for air suction are periodically formed;
A transfer member for fixing the COF film that is air floating on the air slider unit at one or both sides of the air slider unit and slidably transferring the COF film horizontally;
An upper camera for capturing images of the SR surface of the COF film;
A lower camera for photographing the PI surface of the COF film to acquire an image;
A PLC for controlling the movement of the transfer member installed on one or both sides of the air slider unit;
An image capturing unit for capturing an image of an upper camera and a lower camera and collecting the captured image;
An image processor for extracting a color R (Red) value, a color G (Green) value, and a color B (Blue) value from RGB values of a color image of the acquired upper camera and the lower camera 132;
A pattern generating unit for generating a signal pattern for applying a signal for operation of a substrate to a PCB attached to the COF film;
The inspection area is divided on the SR (Solder Resist) surface or the PI (Polyimide) surface and each inspection area is divided into color components R (red), G (green) And a control unit for performing a binarization process on the extracted color components and selecting a color component having the highest resolution among color components extracted from the respective inspection areas to determine a defect type,
When the lead is recognized in the InnerLead portion on the PI (Polyimide) plane, the control unit sets the position of the lead over three regions of interest (ROI), and the x and y coordinates of the center of the lead width Registers the reference image as a reference image, compares the read width of the input image with the x and y coordinates of the reference image based on the registered reference image, generates a shift amount of the lead to determine whether the product is good or defective ,
The vibration absorbing member is a device for absorbing the minute rotation and impact of the stage and the support,
A curved surface portion forming an opening of the housing;
A pillar member inserted into the opening of the curved surface portion and coupled to an upper portion of the pedestal;
A spherical circular sphere connected to an upper portion of the column member;
A seating part which receives and rotates a certain part of the circular sphere;
A support extending in the seating portion and formed in a straight line shape;
A spring member coupled to an upper end of the support;
And a guide member guiding the support member linearly reciprocated by the elasticity of the spring member and receiving the support member and the spring member. delete delete delete delete

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