KR101163231B1 - Tap bonding detecting system for flat panel display - Google Patents

Abstract

The present invention relates to a tab attachment inspection system for flat panel displays. The present invention obtains an image of the table 20 'supporting the panel 20 to which the tab 22 is attached and the tab 22 attached to the panel 20 seated on the table 20'. And an image acquisition unit 24 having a light source 26 capable of adjusting the amount of light and a prism 27 for transmitting the light emitted from the light source 26 by adjusting an angle to an object, and the image acquisition unit 24. And a data processing unit (36) having a data processing unit (37) for processing the image obtained in the < RTI ID = 0.0 > According to the tab attachment inspection system for a flat panel display according to the present invention having such a configuration, it is possible to more accurately inspect the state that the tab is attached to the panel, and to inspect the attachment state of the tab in the production line to produce defective products It can eliminate the defects and process the data that has been inspected with the tab attached in real time, which minimizes the occurrence of defects and efficiently manages and utilizes the data related to tap bonding, thus increasing the productivity of the product. There is this. In addition, the present invention has the advantage of inspecting the attachment state of the LOG portion as well as the general pattern portion of the pad by adjusting the angle of the prism of the image acquisition unit and the amount of light of the light source.

Thermocompression, tap, bonder, crimp, inspection

Description

Tap bonding detecting system for flat panel display

1 is a front view showing the main portion of the prior art bonded PCB.

Figure 2 is a block diagram showing the configuration of a preferred embodiment of the tab attachment inspection system for a flat panel display according to the present invention.

3 is a block diagram showing the main configuration of the image acquisition unit constituting the embodiment of the present invention.

Figure 4 is a photograph showing an example of the image obtained in the embodiment of the present invention.

Figure 5a is a photograph for explaining the indentation strength in the image obtained in the embodiment of the present invention.

5B and 5C are explanatory diagrams showing the profile of the image of the indentation.

Figure 6 is an explanatory view showing the analysis of the distribution of indentations in the embodiment of the present invention.

Figure 7 is a photograph showing the pattern of the LOG portion in the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

20: panel 20 ': table

22: Tab 24: Image Acquisition Unit

26: light source 27: prism

27 ': drive motor 28: focusing unit

30: imaging device 32: movement guide

34: drive drive 36: data processing unit

37: data processing unit 38: data transfer unit

40: control unit 42: display unit

44: drive control unit 46: control unit

48: data transmission unit 50: network

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display, and more particularly, to a tab attachment inspection system for inspecting a state in which a tab for electrically connecting a substrate for controlling the flat panel is attached.

Recently, flat panel displays have been used a lot. The flat panel display includes a liquid crystal panel and a plasma display panel (PDP). In such a flat panel display, for example, a tape carrier package (TCP) called a tab is used to electrically connect a printed circuit board (PCB) to a panel. Thermocompression tools are used in devices such as PCB bonders for attaching the tabs to panels.

The PCB bonder is a device for pressing a printed circuit board and a tab or a tab and a panel at a high pressure after heating the heater to a high temperature of about 300 to 500 ℃. The PCB bonded area is more than 2mm in width and 500mm in length, which is getting longer as the flat panel display becomes larger.

Figure 1 shows the configuration of such a conventional PCB bonder. As shown in the drawing, a conventional PCB bonder includes a movable part 1 capable of vertical movement, a support part 3 positioned below the movable part 1 and connected to interlock according to the operation of the movable part 1, and the support part. It consists of the thermocompression tool 7 which is fixed to the lower board 5 provided in the lower part of (3), and performs substantial crimping.

The thermocompression tool 7 includes a fixing jig 8 mounted to the lower plate 5, and a plurality of heat insulating materials 9 are provided at a lower portion of the fixing jig 8 at predetermined intervals, and the heat insulating material ( The lower portion of 9) is provided with an adjustment block (10). That is, the fixing jig 8 and the adjustment block 10 are coupled to each other with the heat insulating material 9 therebetween.

The push bolt 11 and the pull bolt 12 are installed to penetrate the adjustment block 10. The heating block 13 is provided at a lower portion of the adjustment block 10 by the push bolt 11 and the full bolt 12 at predetermined intervals. The end of the push bolt 11 is seated on the upper surface of the heating block 13, the full bolt 12 is fastened to the threaded hole formed in the heating block (13). Accordingly, the push bolt 11 may exert a force in a direction away from the heating block 13 with respect to the adjustment block 10, the full bolt 12 is the heating toward the adjustment block 10. The force can be exerted to allow the block 13 to approach. These push bolts 11 and full bolts 12 are used so that the tip surface of the tip 15 to be described below can maintain flatness.

The heater 14 is installed to penetrate the heating block 13 fastened to the adjustment block 10 by the push bolt 11 and the full bolt 12. The heaters 14 are installed to the plurality of adjustment blocks 10 in a row.

The heating block 13 is provided with a tip (15). The tip 15 is attached by applying a predetermined pressure to the tap while being heated by the heat transferred from the heating block 13.

However, the above-described conventional techniques have the following problems.

In other words, after bonding the tabs, the attachment precision inspection is now performed through an alignment mark (not shown) in the inspection process. However, there is a dispersion in the alignment mark itself of the tab, which has a problem affecting the inspection accuracy when attached.

In addition, conventionally, the entire product cannot be inspected, and since it is determined by randomness that the tab is bonded to determine whether the tab is bonded, some unsuitable products may occur.

In particular, as flat panel displays become larger in recent years, the size of panels used therein has also increased. Therefore, when one panel is defective, the loss is increased, resulting in a high production cost of the panel.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to more accurately inspect the state where the tab is attached to the panel.

Another object of the present invention is to enable a full inspection of the state that the tab is attached to the panel.

Still another object of the present invention is to be able to receive and process data in real time inspecting the state that the tab is attached to the panel.

Another object of the present invention is to provide an inspection system that can also check the attachment state of the LOG portion corresponding to both ends of the tab.

According to a feature of the present invention for achieving the above object, the present invention is to obtain a table for supporting a panel with a tab attached, and to obtain an image of the tab attached to the panel seated on the table, adjustment of the amount of light An image acquisition unit having a possible light source and a prism capable of transmitting the light emitted from the light source to an object by adjusting an angle, and a data processing unit for processing data obtained by the image acquisition unit to obtain data related to a tab attachment state. It is configured to include a data processing unit having a.

The image acquiring unit is driven by the prism and the light source by a control unit of the data processing unit, and a focusing unit performs focusing on the object to receive the light reflected from the object and the image pickup device acquires the image data.

The image acquisition unit is driven by the control unit of the data processing unit in a direction away from the tab of the panel along the movement guide.

A driving control unit further includes a control unit for controlling the driving of the table and a data transmission unit for transferring data from the data processing unit to an external network.

The data processing unit of the data processing unit detects data related to the strength, quantity, and distribution of the indentation generated by the conductive ball in the image acquired by the image acquisition unit to determine whether the tab is attached.

The indentation strength S is expressed as S = 0.7H + 0.3 Area, where H is a value quantifying the shade of the brightness of the indentation intensity, Area is the area of the area where the indentation is formed, and the indentation strength is a predetermined value. When larger, the attachment state of the tab is judged as good.

The quantity of the indentation is divided into several sections of the tab pattern, and the attachment state is determined to be good when the number of indentations in the section is equal to or greater than a predetermined number. The distribution of the indentation is determined by the initial indentation position of each pattern. The attachment state is judged to be good only when the distance between the final indentation positions is greater than or equal to a predetermined distance.

According to the tab attachment inspection system for a flat panel display according to the present invention having such a configuration, it is possible to more accurately inspect the state that the tab is attached to the panel, and to inspect the attachment state of the tab in the production line to produce defective products It can eliminate the defects and process the data that has been inspected with the tab attached in real time, which minimizes the occurrence of defects and efficiently manages and utilizes the data related to tap bonding, thus increasing the productivity of the product. There is this.

In addition, the present invention has the advantage of inspecting the attachment state of the LOG portion as well as the general pattern portion of the pad by adjusting the angle of the prism of the image acquisition unit and the amount of light of the light source.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the tab attachment inspection system for a flat panel display according to the present invention will be described in detail.

Figure 2 is a block diagram showing a configuration of a preferred embodiment of the tab attachment inspection system for a flat panel display according to the present invention, Figure 3 is a block diagram showing the main configuration of the image acquisition unit constituting an embodiment of the present invention.

As shown in these figures, a plurality of tabs 22 are attached along one side edge of the panel 20. The tab 22 is attached to the panel 20 by a tab bonder. The panel 20 to which the tab 22 is attached should be inspected for the attachment state of the tab 22. The panel 20 to which the tab 22 is attached is seated on a separate table 20 'and its position is adjusted. When the table 20 'is a plane parallel to the surface of the panel 20 as the XY plane, the table 20' can be moved in the XY direction and in the θ direction, so that the position of the panel 20 can be moved. have.

The image acquisition unit 24 is a part for acquiring an image for inspecting whether the tab 22 is attached to the panel 20. The image acquisition unit 24 includes a light source 26. The light source 26 provides light used to obtain an image. The light source 26 is a high brightness LED (LED) is used. The LED (LED) is used that can control the amount of light. If necessary, the light source 26 may be provided with lenses for condensing. The image acquisition unit 24 extracts the position and intensity of the indentation 23 'from the image of the indentation 23' by the conductive ball using a profile of image brightness. It uses the principle of differential submicron.

As shown in FIG. 3, the light emitted from the light source 26 is only the light polarized in one direction through the polarization filter 26 ′. Light emitted from the polarization filter 26 ′ is reflected by the prism 27 and transmitted to the tab 22. The prism 27 is a birefringent prism, which is called a Nomarski prism. The prism 27 is capable of adjusting the angle by the drive motor 27 '. Since the angle of the prism 27 can be adjusted by the driving motor 27 ′, the image acquisition unit 24 allows the log portion of the tab 22 as well as the general pattern 23 of the tab 22. The pattern 23 can also be inspected. The prism 27 also receives light reflected from the tab 22 and transmits the light to the imaging device 30 (CCD), which will be described below.

Light reflected from the tab 22 passes through the prism 27 and passes through the analyzer 28 '. The analyzer 28 ′ may generate a phase difference when light is reflected from the tap 22, and serves to make the phase difference visible in the visible region.

Light passing through the analyzer 28 ′ is transmitted to the image pickup device 30. The imaging device 30 senses the transmitted light to produce an image. The imaging device 30 is used that is relatively high resolution. Reference numeral 28 is a focusing unit for matching the focusing of the image acquired by the image acquisition unit 24.

The image acquisition unit 24 is moved along the movement guide 32 to adjust the distance to the panel 20. The movement of the image acquisition unit 24 relative to the movement guide 32 is made by a drive drive 34. The image acquisition unit 24 is moved toward and away from the panel 20 with respect to the movement guide 32 by the drive drive 34.

The data processor 36 is a part that processes data obtained based on the image acquired by the image acquisition unit 24. That is, the indentation strength, the indentation amount and the indentation distribution generated by the conductive ball 23 'on the pattern 23 of the tab 22 are detected by the conductive ball based on the image obtained by the image acquisition unit 24. Produce data This operation is performed by the data processing unit 37. The data processing unit 37 serves to detect data by analyzing the acquired image. The data processed by the data processing unit 37 is transferred to the data transmission unit 38 to deliver the data where necessary.

The data processor 36 is provided with a control unit 40. The control unit 40 serves to control the image acquisition unit 24 and the drive drive 34. The control unit 40 controls the light source 26, the driving motor 27 ′, the focusing unit 28, the imaging device 30, the driving drive 34, and the like of the image acquisition unit 24. do. The control unit 40 adjusts the amount of light of the light source 26, the rotation angle of the driving motor 27 ′, the focusing operation of the focusing unit 28, the driving adjustment of the imaging device 30, and the driving drive 34. Adjust the operation of).

The data obtained by the data processor 36 is displayed on the display 42 so that an operator can see it. The display unit 42 displays the data obtained by the data processing unit 36 in a manner that can be viewed by an operator in real time.

The drive controller 44 controls the drive drive 28 for controlling the movement of the table 20 'on which the panel 20 is seated, and receives data from the data processor 36 and transmits the data to the network 50. It plays a role. To this end, the drive control unit 44 is provided with a control unit 46 and a data transmission unit 48. In fact, the driving controller 44 may be provided together with the data processor 36. That is, the control unit 40 of the data processing unit 36 and the control unit 46 of the driving control unit 48 are integrated into one, and the data processing transmission unit 38 and the data transmission unit 48 are integrated into one. It may be.

Hereinafter, the operation of the tab attachment inspection system for a flat panel display according to the present invention having the above configuration will be described in detail.

First, the operation of the tab attachment inspection system of the present invention will be described. The panel 20 to which the tab 22 is attached is seated on the table 20 'and driven by the drive drive 28 to move the panel 20 to the inspection position.

The image acquisition unit 24 is guided along the movement guide 32 by the drive drive 34 and moved to a position adjacent to the tab 22 of the panel 20. In this state, the image acquisition unit 24 is driven to acquire an image of the tab 22. That is, light from the light source 26 driven by the control of the control unit 40 is transmitted to the prism 27 through the polarization filter 26 ', and the light from the prism 27 to the tab 22. Delivered. Light transmitted to the tab 22 is reflected from the tab 22 and is transmitted back to the prism 27. The light transmitted to the prism 27 passes through the prism 27 and the analyzer 28 ′, and is then transmitted to the imaging device 30. An image is obtained by the light transmitted to the imaging device 30.

An example of such an image is shown in FIG. 4. Here, the pattern 23 of the tab 22 extends vertically and is provided at regular intervals. The pattern 23 overlaps with that of the panel 20. Therefore, only the pattern 23 of the tab 22 is visible in the acquired image. An indentation 23 'generated by the conductive ball is generated in the pattern 23.

By detecting and confirming the strength (protrusion degree), quantity, and distribution of the indentation 23 'generated by the conductive ball, it is possible to determine whether the tab 22 is attached or not.

That is, indentations 23 ′ A and B in the image as shown in FIG. 5A may be displayed as shown in FIGS. 5B and 5C, respectively. Here, the value between the most protruding portion on one surface and the most protruding portion on the other surface is H (the shade of brightness and is quantified), and the area of the area where the indentation 23 'is formed is Area. Indentation strength S = 0.7H + 0.3 Area. In determining the indentation strength S, the protrusion height H plays a role of 70% and the area area plays a role of 30%. Here, good judgment is made when ΣS _i > ΣS _Limit .

Next, the quantity of the indentation 23 'is demonstrated. It is to check how much the quantity of the indentation 23 'generated by the conductive ball is in a predetermined region. That is, as shown in FIG. 4, each pattern 23 is divided into predetermined areas, and the number of indentations 23 'is determined in each of the areas to determine whether the bonded state is present.

C _ij > C _j-Limit

When this expression is satisfied, a suitability judgment is made. Here, i denotes the position of the pattern 23 and j denotes the area of each pattern 23. In this embodiment, by dividing one pattern 23 into three areas, the quantity of the indentation 23 'is checked to determine the quality of the bonded state.

Next, the bonding state of the pad 22 is determined using the distribution of the indentation 23 '. As shown in FIG. 6, the distance L between the final position where the indentation 23 'is present at the starting position where the indentation 23' exists in one pattern 23 is identified.

L _i > L _Limit

Here, L _i refers to the distribution distance of the i-th pattern 23, which is determined to be a proper state only when it is larger than a predetermined value.

On the other hand, the LOG portion corresponding to both ends of the pad 22 is weak in the state of the indentation (23 '). Therefore, in the present invention, the image acquisition unit 24 controls the angle of the prism 27 with the driving motor 27 'and the light amount of the light source 26 so that the image acquisition unit 24 displays the image of the general pattern 23 and the LOG portion. All can be obtained.

For reference, Figure 7 shows a picture of the LOG portion. Although the indentation 23 'is relatively weaker than other parts of the LOG portion, the image may be acquired and analyzed by adjusting the angle of the prism 27 and the amount of light from the light source 26. Determination of the attachment status in the LOG portion is performed by checking the strength, number and distribution of the indentation 23 'as described above.

On the other hand, the data obtained by the data processing unit 36 as described above is displayed on the display unit 42 in real time to enable the operator to confirm. Therefore, the operator can check whether the tab 22 is properly attached to each panel 20 in real time.

In addition, the data processing transmission unit 38 sends data to the data transmission unit 48 of the drive control unit 44, and the data transmission unit 48 transmits the data to the network 50, thereby managing the data. It can be done in real time.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

In the tab attachment inspection system for a flat panel display according to the present invention as described in detail above, the following effects can be obtained.

First, in the present invention, it is possible to examine how accurately the tab is attached to the panel by detecting the strength, the number, and the distribution state of the indentation generated by the conductive ball while the tab is attached to the panel. That is, since the strength, number and distribution state of the indentation by the conductive ball are detected by using the principle of differential interference microscope in the acquired image, it is possible to detect the attachment state of the tap more accurately.

In the present invention, since the image acquisition unit is installed near the table on which the panel is supported and has a built-in light source, all the products can be inspected. Therefore, there is an effect that can minimize the defective rate of the product through a full inspection.

In the present invention, the image obtained by the image acquisition unit may be processed in a data processing unit to obtain desired data and to deliver the desired data in real time through the display unit and the network. Therefore, the state in which the tab is attached to the panel can be checked in real time, thereby minimizing defects.

On the other hand, in the present invention, the light source of the image acquisition unit can control the amount of light, and the angle of the prism can be adjusted, so that not only the attachment inspection on the general pattern of the tab, but also the attachment state of the LOG portions at both ends of the tab can be performed together. The effect of being able to reliably grasp the attachment state of a single equipment.

Claims (7)

A table for supporting the tabbed panel, Acquiring an image of a tab attached to the panel seated on the table, a light source capable of adjusting the amount of light, a prism for transmitting the light emitted from the light source by adjusting the angle to the object, and focusing for focusing the object. And an image acquisition unit including an image pickup device that receives image light emitted from the light source and reflected from an object. And a data processing unit including a data processing unit for processing the image acquired by the image acquisition unit to obtain data related to a tap attachment state, and a control unit for controlling the image acquisition unit. The data processing unit of the data processing unit detects one or more of data related to the strength, quantity, and distribution of indentation generated by the conductive ball in the image acquired by the image acquisition unit, and determines whether the tab is attached or not. Tabbed inspection system for flat panel displays. delete The flat panel display tab attachment inspection system according to claim 1, wherein the image acquisition unit is driven by a control unit of the data processing unit in a direction away from the tab of the panel along a movement guide. 4. The flat panel display tab of claim 3, further comprising a drive control unit having a control unit for controlling the drive of the table and a data transfer unit for transferring data from the data processing unit to an external network. Attachment inspection system. delete The method of claim 1, wherein the indentation strength (S) is expressed as S = 0.7H + 0.3 Area, where H is a value quantified the shade of the brightness of the indentation intensity, Area is the area of the area where the indentation is formed, A tab attachment inspection system for a flat panel display, characterized in that the attachment state of the tab is determined to be good when the indentation strength is greater than a predetermined value. 7. The method of claim 6, wherein the quantity of the indentation divides the pattern of the tab into several sections, and it is determined that the attachment state is good only when the number of indents in the section is equal to or greater than a predetermined number. A tab attachment inspection system for a flat panel display, characterized in that the attachment state is determined to be good when the distance between the initial indentation position and the final indentation position of the pattern is greater than or equal to a predetermined distance.

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