TWI692278B - Flexible circuit board - Google Patents

Abstract

A flexible circuit board disclosed in this invention includes a base film and a circuit layer. The circuit layer includes a first identify feature and a second identify feature located in different image capture regions on the base film. The first identify feature involves at least one first mark located between dodge segments of two first lines, and the second identify feature involves at least one second mark located between dodge segments of two second lines. The first identify feature is different to the second identify feature in shape or position in order to separate different image capture regions.

Description

Flexible circuit board

The invention relates to a flexible circuit board, in particular to a flexible circuit board with different shape or position characteristics.

The flexible circuit board is an important component of the LCD screen. It is used to connect the LCD panel and the circuit board. In response to the large size and high image quality requirements of the LCD screen, the number of circuits on the flexible circuit board has increased significantly. Therefore, automatic optical inspection (automatic inspection) is required. optical inspection, AOI) replaces visual inspection, captures line pattern images, and uses visual software to analyze whether the line is defective. However, when the line on the flexible circuit board is a repeating pattern and spans different image capture areas, There are no features that can be distinguished between the images captured from different areas. Even if the circuit is judged to have a defect based on the analysis result, it is still impossible to know which region of the flexible circuit board the defect is in.

The purpose of the present invention is to provide a flexible circuit board, the circuit layers on the flexible circuit board have different identification features, which are located in different image capturing areas, so that the AOI system can distinguish circuit images from different areas.

A flexible circuit board of the present invention includes a film substrate, a plurality of transmission holes and a circuit layer. The film substrate has a surface defined by a detection area, the detection area has a first image capture area and a second In the image capturing area, the drive holes are longitudinally arranged on both sides of the film substrate, and the detection area has a length along the arrangement direction of the drive holes on the same side, and the length is not less than that of the drive holes adjacent on the same side A distance between the circuit layer is formed on the surface and has a first identification feature and a second identification feature, the first identification feature is located in the first image capture area, the second identification feature is located in the second image In the extraction area, the first identification feature and the second identification feature are different shape features or position features, wherein the first identification feature is composed of at least one first unit, and the first unit has two first lines and A first mark, the first lines are symmetrically mirrored with each other and each have at least a first extension portion and a first concession portion, the first extension portion extends from one side of the first concession portion, the A distance between the first extensions is smaller than a distance between the first yielding parts, the first mark is located between the first yielding parts, wherein the second identification feature is composed of at least one second unit The second unit has two second lines and a second mark. The second lines are symmetrically mirrored with each other and each has at least a second extension portion and a second concession portion. The second extension portion is from One side of the second concession extends, a spacing between the second extensions is smaller than a spacing between the second concessions, the second mark is located between the second concessions .

If the image captured by the AOI system is a repeated circuit pattern, the analysis software cannot distinguish images in different regions, so the present invention forms the first identification feature and the second identification feature with different shapes or positions on the circuit layer for the AOI system Differentiate the line images captured from the first image capturing area and the second image capturing area.

Please refer to FIG. 1a, which is the first embodiment of the present invention. A tape substrate includes a plurality of flexible circuit boards A, each of which has a thin film substrate 100, a plurality of driving holes 200, and a circuit layer 300 The driving holes 200 are arranged longitudinally on both sides of the film substrate 100. The circuit layer 300 is formed on a surface 110 of the film substrate 100. Preferably, the film substrate 100 is a polyimide (PI) film Or polyethylene terephthalate (PET) film with no less than 7 transmission holes 200 on both sides, a copper foil substrate covering the surface 110 of the film substrate 100 after etching The circuit layer 300 is formed, and the ratio of the circuit layer 300 covering the surface 110 of the thin film substrate 100 is not less than 47.2%.

Please refer to FIG. 1a, the surface 110 defines a detection area 111, part of the circuit layer 300 is located in the detection area 111, and an automatic optical inspection (AOI) system is directed to the circuit layer 300 located in the detection area 111 Perform testing to confirm whether the circuit layer 300 is defective. The detection area 111 has a length L along the arrangement direction of the transmission holes 200 on the same side, and the length L is not less than that of the transmission holes 200 adjacent on the same side A distance D between, preferably, the length L is greater than the distance D, the detection area 111 includes a first image capture area 111a and a second image capture area 111b, in this embodiment, the first The image capturing area 111a and the second image capturing area 111b are longitudinally arranged in the detection area 111, so the same CCD camera can be used to sequentially capture the first image capturing area 111a and the second image capturing area The image of the circuit layer 300 in 111b, and then analyze the image by visual software to determine whether the circuit layer 300 is defective.

Please refer to FIG. 1a, the circuit layer 300 has a first identification feature and a second identification feature, the first identification feature is located in the first image capture area 111a, and the second identification feature is located in the second image capture In the region 111b, in this embodiment, the first recognition feature and the second recognition feature are different shape features, so when the visual software analyzes the image, it can be distinguished by the first recognition feature and the second recognition feature Images from the first image capturing area 111a and the second image capturing area 111b.

Please refer to FIG. 1b, the first identification feature is composed of at least one first unit 310, the first unit 310 has two first lines 311 and a first mark 312, the two first lines 311 mirror each other symmetrically, Each of the first lines 311 has at least a first extension portion 311a and a first yielding portion 311b. The first extension portion 311a is connected to the first yielding portion 311b and extends from one side of the first yielding portion 311b , A pitch P1a between the first extending portions 311a is smaller than a pitch P1b between the first yielding portions 311b, the first mark 312 is located in the space between the first yielding portions 311b, Preferably, each of the first lines 311 has two first extending portions 311a, which extend outward from both sides of the first yielding portion 311b, respectively.

Please refer to FIG. 1c, the second identification feature is composed of at least one second unit 320, the second unit 320 has two second lines 321 and a second mark 322, the two second lines 321 mirror each other symmetrically, Each second line 321 has at least one second extension portion 321a and a second concession portion 321b, the second extension portion 321a is connected to the second concession portion 321b and extends from one side of the second concession portion 321b , A pitch P2a between the second extension portions 321a is smaller than a pitch P2b between the second yield portions 321b, the second mark 322 is located in the space between the second yield portions 321b, Preferably, each of the second lines 321 has two second extending portions 321a, which extend outward from both sides of the second yielding portion 321b, respectively.

In this embodiment, the pitch P1a between the first extending portions 311a is substantially equal to the pitch P2a between the second extending portions 321a, and the pitch between the first yielding portions 311b P1b is substantially equal to the pitch P2b between the second concessions 321b, and the first lines 311, the first mark 312, the second lines 321, the second mark 322 and others are located on the film The circuits on the substrate 100 are formed by the same etching process.

The first identification feature and the second identification feature depend on the shape, position or combination of the first mark 312 and the second mark 322, so when the shape of the first mark 312 is different from the shape of the second mark 322 When the first recognition feature and the second recognition feature are different shape features, the relative position of the first mark 312 in the first image capture area 111a is different from the second mark 322 in the second image capture When the relative position in the area 111b is taken, the first recognition feature and the second recognition feature are different location features.

Please refer to FIG. 1a. Preferably, the first recognition feature is composed of a plurality of first units 310, and the second recognition feature is composed of a plurality of second units 320, so the first recognition feature includes a plurality of first marks 312, and the second identification feature includes a plurality of second marks 322, when the shape of the first mark 312 of one of the first units 310 and the second mark 322 of one of the second units 320 are different The first identification feature and the second identification feature are different shape features. In the first embodiment, the first marks 312 of the first units 310 have different shapes, and the first The two marks 322 have different shapes, and the shapes of the first marks 312 and the second marks 322 are not repeated.

Please refer to FIG. 1a. In this embodiment, the positions of the first marks 312 of the first units 310 and the second marks 322 of the second units 320 are symmetrically arranged, that is, the first marks 312 The arrangement in the first image capturing area 111a is the same as the arrangement of the second marks 322 in the second image capturing area 111b, so the first identification feature and the second identification feature are the same position feature and Different shape features.

Please refer to FIG. 2, which is the second embodiment of the present invention. The difference from the first embodiment is that the first marks 312 of the first units 310 have the same shape (circular), and the second units 320 The second marks 322 have the same shape (inverted triangle), but the shapes of the first marks 312 are different from the shapes of the second marks 322, so the first identification feature and the second identification feature are the same position feature And different shape features.

Please refer to FIG. 3, which is the third embodiment of the present invention. The difference from the first embodiment is that the first marks 312 of the first units 310 and the second marks 322 of the second units 320 The position is an asymmetric configuration, that is, the arrangement of the first marks 312 in the first image capture area 111a is different from the arrangement of the second marks 322 in the second image capture area 111b, so the first The identification feature and the second identification feature are different position features and different shape features.

Please refer to FIG. 4, which is a fourth embodiment of the present invention. The difference from the third embodiment is that the first marks 312 of the first units 310 and the second marks 322 of the second units 320 have The same shape (circle), so the first recognition feature and the second recognition feature are different position features and the same shape feature.

Please refer to FIGS. 1a to 4. Preferably, the first marks 312 are not connected to the first lines 311 and are electrically insulated from the first lines 311, and the second marks 322 are not connected to the second lines 321 And electrically insulated from the second lines 321, and the first mark 312 and the second mark 322 are solid dummy patterns. In other embodiments, the first mark 312 may be connected to the first lines A line 311, the second mark 322 can be connected to the second lines 321, the invention is not limited thereto.

Please refer to FIGS. 5a to 5c, which is a fifth embodiment of the present invention. The difference from the first embodiment is that the first mark 312 and the second mark 322 are hollow dummy patterns. Preferably, the first The line width of the mark 312 is substantially equal to the line width of the first lines 311, the line width of the second mark 322 is substantially equal to the line width of the second lines 321, and the line width of the first lines 311 is substantially The upper limit is equal to the line width of the second lines 321.

Please refer to FIG. 6, which is a sixth embodiment of the present invention. The difference from the first embodiment is that the first image capturing area 111a and the second image capturing area 111b are arranged laterally in the detection area 111, so The circuit layer 300 images located in the first image capturing area 111a and the second image capturing area 111b are captured by different CCD cameras.

Please refer to FIG. 7, which is a seventh embodiment of the present invention. The detection area 111 is divided into a first image capturing area 111a, a second image capturing area 111b, a third image capturing area 111c and A fourth image capturing area 111d, the first image capturing area 111a and the second image capturing area 111b are arranged longitudinally, a CCD camera captures its image, the third image capturing area 111c and the fourth The image capturing areas 111d are arranged longitudinally, and their images are captured by another CCD camera. The image capturing areas each have an identification feature, and the identification features are different shape features or position features to distinguish the For the image capturing area, the present invention does not limit the number and arrangement of image capturing areas. According to the size of the detection area 111 and the configuration of the CCD camera, the detection area 111 is selectively divided into a plurality of image capturing areas.

The scope of protection of the present invention shall be subject to the scope defined in the attached patent application. Any changes and modifications made by those who are familiar with this skill without departing from the spirit and scope of the present invention shall fall within the scope of protection of the present invention. .

100: thin film substrate 110: surface 111: detection area 111a: first image capture area 111b: Second image capture area 111c: third image capture area 111d: fourth image capture area 200: transmission hole 300: line layer 310: Unit 1 311: First line 311a: First extension 311b: the first concession 312: First mark 320: Unit 2 321: Second line 321a: Second extension 321b: Second concession 322: Second mark A: Flexible circuit board D: distance L: length P1a: pitch P1b: pitch P2a: pitch P2b: pitch

Figure 1a: A top view of a flexible circuit board according to the first embodiment of the present invention. Figure 1b: Partially enlarged view of Figure 1a. Figure 1c: Partially enlarged view of Figure 1a. Figure 2: A top view of a flexible circuit board according to the second embodiment of the present invention. Figure 3: A top view of a flexible circuit board according to the third embodiment of the present invention. Figure 4: A top view of a flexible circuit board according to the fourth embodiment of the present invention. Figure 5a: A top view of a flexible circuit board according to a fifth embodiment of the present invention. Figure 5b: Partially enlarged view of Figure 5a. Figure 5c: Partially enlarged view of Figure 5a. Figure 6: A top view of a flexible circuit board according to the sixth embodiment of the present invention. Figure 7: A top view of a flexible circuit board according to the seventh embodiment of the present invention.

100: thin film substrate

110: surface

111: detection area

111a: first image capture area

111b: Second image capture area

200: transmission hole

300: line layer

312: First mark

322: Second mark

A: Flexible circuit board

D: distance

L: length

Claims (14)

A flexible circuit board, including: A thin film substrate having a surface, the surface defines a detection area, the detection area has a first image capture area and a second image capture area; A plurality of transmission holes are arranged longitudinally on both sides of the film substrate, and the detection area has a length along the arrangement direction of the transmission holes on the same side, and the length is not less than a distance between the transmission holes adjacent on the same side ;as well as A circuit layer is formed on the surface, the circuit layer has a first identification feature and a second identification feature, the first identification feature is located in the first image capture area, and the second identification feature is located in the second image In the extraction area, the first identification feature and the second identification feature are different shape features or position features, wherein the first identification feature is composed of at least one first unit, and the first unit has two first lines and A first mark, the first lines are symmetrically mirrored with each other and each have at least a first extension portion and a first concession portion, the first extension portion extends from one side of the first concession portion, the A spacing between the first extensions is smaller than a spacing between the first yielding portions, the first mark is located between the first yielding portions, wherein the second identification feature is composed of at least one second unit The second unit has two second lines and a second mark. The second lines are symmetrically mirrored with each other and each has at least a second extension portion and a second concession portion. The second extension portion is from One side of the second concession extends, a spacing between the second extensions is smaller than a spacing between the second concessions, the second mark is located between the second concessions . The flexible circuit board as described in item 1 of the patent application scope, wherein the first mark is electrically insulated from the first circuits. The flexible circuit board as described in item 1 of the patent application scope, wherein the first mark is a solid dummy pattern. The flexible circuit board as described in item 1 of the patent application scope, wherein the first mark is a hollow dummy pattern. The flexible circuit board as described in item 4 of the patent application scope, wherein the line width of the first mark is substantially equal to the line width of the first lines. The flexible circuit board as described in item 1 of the patent application scope, wherein the first identification feature is composed of a plurality of first units, and the second identification feature is composed of a plurality of second units, one of which is the first unit of the The first mark and one of the second marks of the second unit have different shapes. The flexible circuit board as described in item 6 of the patent application scope, wherein the first marks of the first units have different shapes. The flexible circuit board as described in item 6 of the patent application scope, wherein the first marks of the first units have the same shape. The flexible circuit board as described in item 6 of the patent application scope, wherein the positions of the first marks of the first units and the second marks of the second units are symmetrically arranged. The flexible circuit board as described in item 6 of the patent application scope, wherein the positions of the first marks of the first units and the second marks of the second units are asymmetrically arranged. The flexible circuit board as described in item 1 of the patent application scope, wherein the first identification feature is composed of a plurality of first units, the second identification feature is composed of a plurality of second units, and the first of the first units The positions of the marks and the second marks of the second units are asymmetrically arranged. The flexible circuit board as described in item 11 of the patent application scope, wherein the first marks of the first units and the second marks of the second units have the same shape. The flexible circuit board as described in item 1 of the patent application scope, wherein the two sides of the thin film substrate have not less than 7 transmission holes, respectively. The flexible circuit board as described in item 1 of the patent application scope, wherein the proportion of the circuit layer covering the surface of the thin film substrate is not less than 47.2%.

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