Circuit board and liquid crystal display device using that

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a circuit board capable of jumper connection without using a jumper chip and a liquid crystal display device including the circuit board.

【0002】

[Conventional technology]

In the circuit board, in order to change the input / output terminal arrangement according to the customer's specifications or to change the specifications to some extent, the wiring is changed by connecting the wiring with a jumper such as a lead wire or a chip component. Sometimes. In such a case, even in the case of a flexible circuit board, the wiring is generally connected to each other by using a jumper chip.

【0003】

[Problems to be Solved by the Invention]

However, if chip parts are used for jumper connection, the number of parts increases, the cost increases, and the weight reduction of the device as a whole is impaired.

【0004】

The present invention has been made in view of the above problems, and an object of the present invention is a circuit board capable of connecting wirings of a flexible substrate without using a jumper chip and a liquid crystal using the same. The purpose is to provide a display device.

【0005】

[Means for solving problems]

The circuit board according to the present invention is a circuit board having a flexible substrate and first and second wirings printed and wired on the flexible substrate, and the first wiring is more than other parts. The second widening portion includes a wide-formed first widening portion, and the second wiring includes a second widening portion formed wider than the other portions, and a part of the first wiring including the first widening portion is described. The first widened portion is cut out together with the flexible substrate to form a tongue-shaped portion having a free end, and the tongue-shaped portion is folded back so that the first widened portion is brought into contact with the second widened portion. It is characterized in that the first wiring and the second wiring are formed so as to be connectable.

【0006】

According to the circuit board of the present invention, the tongue-shaped portion formed by cutting out a part of the first wiring together with the flexible substrate is folded back and brought into contact with the second wiring to connect the first wiring and the second wiring. be able to. Therefore, a jumper connection between the first wiring and the second wiring is possible without using a jumper chip.

【0007】

Further, the free end of the tongue-shaped portion formed is the first widening portion formed wider than the other portions of the first wiring, and the first widening portion contacts the second widening portion of the second wiring. Since the jumper between the first wiring and the second wiring is performed, the contact area can be increased, and the first wiring and the second wiring can be jumped with a low contact resistance.

【0008】

More preferably, the circuit board of the present invention is characterized in that the second widening portion has an insertion portion into which the free end of the tongue-shaped portion is inserted.

【0009】

In this circuit board, since the insertion portion is formed in the second widening portion of the second wiring, this difference is obtained when the first widening portion of the first wiring cut out as a tongue-shaped portion is brought into contact with and jumped. By inserting the first widening part into the insertion part, it can be temporarily fixed and connected by soldering or the like. Therefore, work efficiency can be improved.

【0010】

The circuit board of the present invention is a flexible substrate including a first wiring and a second wiring, and is a tongue-shaped portion in which a part of the first wiring is cut out together with the flexible substrate and one end is a free end. By forming the tongue-shaped portion and folding back the tongue-shaped portion, the first wiring is brought into contact with the second wiring with low contact resistance, and the first wiring and the second wiring can be connected to each other. It is a feature.

【0011】

According to the circuit board of the present invention, the tongue-shaped portion formed by cutting out a part of the first wiring together with the flexible substrate is folded back and brought into contact with the second wiring, so that the first wiring and the second wiring have low contact. It can be connected with a resistor. Therefore, a jumper connection between the first wiring and the second wiring is possible without using a jumper chip.

【0012】

Further, preferably, the circuit board of the present invention further has a third wiring located between the first wiring and the second wiring, and the tongue-shaped portion does not come into contact with the third wiring. It is characterized in that it can be contacted with the second wiring.

【0013】

According to the circuit board of the present invention, the first wiring can be jumped to the second wiring without short-circuiting to the third wiring, which is the wiring located between the first wiring and the second wiring.

【0014】

More preferably, in the circuit board of the present invention, the first wiring has a trailing portion following a portion that becomes a free end of the tongue-shaped portion, and the trailing portion is said to be said when the tongue-shaped portion is cut out. It is characterized in that the electrical connection with the tongue is broken.

【0015】

When the circuit board of the present invention is formed by cutting out the tongue-shaped portion, the electrical connection between the tongue-shaped portion and the succeeding portion following the portion that becomes the free end of the tongue-shaped portion in the first wiring is cut. Therefore, the first wiring can be changed from the connection to the succeeding portion, which is the connection before the tongue-shaped portion is cut out, to the connection to the second wiring to which the cut-out tongue-shaped portion is connected. More preferably, the circuit board of the present invention is characterized in that a notch is formed in advance in a portion of the flexible substrate to be cut to form the tongue-shaped portion.

【0016】

Therefore, the circuit board of the present invention can be easily cut at an accurate position to form the tongue-shaped portion.

【0017】

The liquid crystal display device of the present invention is characterized by including any of the circuit boards described above. Therefore, a liquid crystal display device having an effect on the circuit board described above can be obtained.

【0018】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

【0019】

[First Embodiment] FIG. 1 is a perspective view showing a part of the circuit board 10 of the present embodiment. The circuit board 10 is formed with first and second wirings 18 and 32 printed and wired on one surface of the flexible substrate 14. The flexible substrate 14 is formed of, for example, a polyimide resin, a polyester resin (PES), or a polyether terephthalate resin (PET). Further, the first wiring 18 includes a first widening portion 22 formed wider than the other portions, and the second wiring 32 includes a second widening portion 36 formed wider than the other portions. The first and second wires 18,32 are formed of, for example, copper, copper + N nickel plating + gold plating, or other conductive material. The shaded area in FIG. 1 indicates the exposed wiring layer.

【0020】

In FIG. 2, a part of the first wiring 18 including the first widening portion 22 is cut out together with the flexible substrate 14 to form a tongue-shaped portion 26 in which the first widening portion 22 is a free end, and the tongue-shaped portion 26 is formed. A state is shown in which the first wiring 18 and the second wiring 32 are connected by folding back the portion 26, bringing the first widening portion 22 into contact with the second widening portion 36, soldering or adhering with a conductive adhesive. In this way, the circuit board 10 of the present embodiment can connect the first wiring 18 and the second wiring 32.

【0021】

As described above, in the circuit board 10, the tongue-shaped portion 26 formed by cutting out a part of the first wiring 18 together with the flexible substrate 14 is folded back and brought into contact with the second wiring 32 to form the first wiring 18. It can be connected to the second wiring 32. Therefore, a jumper connection between the first wiring 18 and the second wiring 32 is possible without using a jumper chip. The first wiring 18 may be partially cut out in advance before cutting out the flexible substrate 14.

【0022】

Further, the free end 28 of the tongue-shaped portion 26 formed is the first widening portion 22 formed wider than the other portions of the first wiring 18, and the first widening portion 22 is the second wiring 32. Since the jumper between the first wiring 18 and the second wiring 32 is performed in contact with the second widening portion 36, the contact area can be increased and the first wiring 18 and the second wiring 32 have low contact. You can jumper with resistance.

【0023】

Further, as shown in FIG. 2, the trailing portion 24, which is a wiring portion following the portion of the tongue-shaped portion 26 that becomes the free end 28 in the first wiring 18, becomes a tongue-shaped portion 26 when the tongue-shaped portion 26 is cut out. The electrical connection between them is broken. In this way, in the circuit board 10, the cut-out tongue-shaped portion 26 is connected from the connection to the succeeding portion 24, which is the connection before the tongue-shaped portion 26 is cut out, in the connection of the first wiring 18. It can be changed to the connection to wiring 32.

【0024】

Further, as shown in FIG. 3, which is a cross-sectional view taken along the line Aa of FIG. 1, the circuit board 10 is previously formed in a portion where the flexible substrate 14 is cut in order to form the tongue-shaped portion 26. A notch is formed. Therefore, in the circuit board 10, cutting for forming the tongue-shaped portion 26 can be easily performed at an accurate position.

【0025】

FIG. 4 is a perspective view showing a liquid crystal display device 60 formed by connecting the circuit board 10 of the present embodiment to the liquid crystal panel 62. By forming the liquid crystal display device 60 using the circuit board 10, for example, the signal arrangement in the terminal portion 52 of the circuit board 10 can be easily performed according to the specifications of the manufacturer of the electronic device incorporating the liquid crystal display device 60. Can be changed to.

【0026】

[Second Embodiment] The second embodiment is different from the first embodiment in that the third wiring exists between the first wiring and the second wiring. Since the other points are the same as those in the first embodiment, the description thereof will be omitted. Further, in the drawings, the corresponding parts are designated by the same reference numerals as those in the first embodiment.

【0027】

FIG. 5 shows a perspective view of the circuit board 70 of the present embodiment. Further, FIG. 6 is a perspective view showing a state in which a part of the first wiring 18 is cut out together with the flexible substrate 14 to form a tongue-shaped portion 26, and the tongue-shaped portion 26 is connected to the second wiring 32. .. As shown in these figures, in the circuit board 70, the third wiring 72 is located between the first wiring 18 and the second wiring 32, and the cut out tongue-shaped portion 26 contacts the third wiring 72. It can be connected to the second wiring 32 without any trouble. Therefore, the first wiring 18 can be jumped to the second wiring 32 without short-circuiting to the third wiring 72, which is the wiring located between the first wiring 18 and the second wiring 32.

【0028】

7 and 8 are perspective views showing a modified example of the present embodiment, FIG. 7 shows a state before the first widening portion 22 to be the tongue-shaped portion 26 is cut out and folded back, and FIG. 8 is the first A part of the wiring 18 is cut out together with the flexible substrate 14 to form a tongue-shaped portion 26, and the tongue-shaped portion 26 is connected to the second wiring 32 without contacting the third wiring 72. In the examples shown in these figures, there are a plurality of third wirings 72 interposed between the first wiring 18 and the second wiring 32. Further, in this example, the first wiring 18 and the second wiring 32 are in an orthogonal relationship. Although these two points are different from the examples shown in FIGS. 5 and 6, the tongue-shaped portion 26 is not short-circuited to the third wiring 72, which is the wiring located between the first wiring 18 and the second wiring 32. The jumper connection of the first wiring 18 to the second wiring 32 can be performed by the same method as in the examples shown in FIGS. 5 and 6.

【0029】

FIG. 9 is a perspective view showing another modified example of the present embodiment, in which a portion of the first wiring 18 continuing from the first widening portion 22 is cut out together with the flexible substrate 14 to form a tongue-shaped portion 26. Indicates a state in which the tongue-shaped portion 26 is to be connected to the second wiring 32 without contacting the third wiring 72 by passing the two insertion portions 74, 74 formed in the vicinity of the third wiring 72. ing. By connecting the tongue-shaped portion 26 passing under the third wiring 72 to the second wiring 32 in this way, the third wiring 72 interposed between the first wiring 18 and the second wiring 32 can be reliably connected. The first wiring 18 and the second wiring 32 can be connected in an insulated state.

【0030】

[Third Embodiment] The third embodiment is different from the first embodiment in that an insertion portion into which the free end of the tongue-shaped portion is inserted is formed in the second widening portion of the second wiring. Since the other points are the same as those in the first embodiment, the description thereof will be omitted. Further, in the drawings, the corresponding parts are designated by the same reference numerals as those in the first embodiment.

【0031】

FIG. 10 is a perspective view showing a state in which the free end 28 of the tongue-shaped portion 26 is inserted into the insertion portion 82 formed in the second widening portion 36 in the circuit board 80 of the present embodiment. In the circuit board 80, since the insertion portion 82 is formed in the second widening portion 36 of the second wiring 32, the free end 28 of the tongue-shaped portion 26 is brought into contact with the second widening portion 36 of the second wiring 32. When jumping, the free end 28 of the tongue-shaped portion 26 can be inserted into the insertion portion 82 and temporarily fixed. Therefore, the state can be easily maintained and the tongue-shaped portion 26 and the second widening portion 36 of the second wiring 32 can be connected by soldering or the like, and the work efficiency can be improved.

【0032】

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention or within the scope of claims. It is possible.

【0033】

For example, in each of the above embodiments, when the first wiring is cut out together with the flexible substrate to form the tongue-shaped portion, an example is shown in which the first wiring is cut out from the immediate vicinity of the first wiring. The tongue-shaped portion may be cut out at intervals of minutes.

【0034】

You may.

【0035】

Further, in each of the above embodiments, a first widening portion wider than the other portions of the first wiring is formed, the portion is used as a free end of the tongue-shaped portion, and a portion of the second wiring to which the tongue-shaped portion is connected. Is shown as the second widening part, which is wider than the other parts. However, if the tongue-shaped portion of the first wiring and the second wiring can be connected with a sufficiently small contact resistance, the first widening portion and the second widening portion do not necessarily have to be formed wider than the other portions.

【0036】

Further, in each of the above embodiments, a circuit board having only one wiring layer is shown, but even if the circuit board has a plurality of wiring layers, the area where the circuit pattern does not exist other than one surface layer is tongue-in-cheek. It is also possible to form a portion to be a shaped portion, and to form a circuit board capable of jumper wiring between the first wiring and the second wiring by the tongue-shaped portion.

[Simple explanation of drawings]

[Figure 1]

It is a perspective view which shows a part of the circuit board of 1st Embodiment.

[Figure 2]

FIG. 5 is a perspective view showing a state in which a tongue-shaped portion is cut out, folded back, and connected to a second wiring in the circuit board of the first embodiment.

[Fig. 3]

It is sectional drawing of the circuit board at the position along the line Aa shown in FIG.

[Fig. 4]

It is a perspective view which shows the liquid crystal display device using the circuit board of 1st Embodiment.

[Fig. 5]

It is a perspective view which shows a part of the circuit board of 2nd Embodiment.

[Fig. 6]

FIG. 5 is a perspective view showing a state in which the tongue-shaped portion of the circuit board shown in FIG. 5 is cut out, folded back, and connected to the second wiring.

[Fig. 7]

It is a perspective view which shows a part of the circuit board of the modification of 2nd Embodiment.

[Fig. 8]

FIG. 5 is a perspective view showing a state in which the tongue-shaped portion of the circuit board shown in FIG. 7 is cut out, folded back, and connected to the second wiring.

[Fig. 9]

It is a perspective view which shows a part of the circuit board of another modification of 2nd Embodiment.

[Fig. 10]

It is a perspective view which shows a part of the circuit board of 3rd Embodiment.

[Explanation of symbols]

10,70,80 Circuit board 14 Flexible substrate 18 1st wiring 22 1st widening part 24 Subsequent 26 Tongue 28 Free end 32 2nd wiring 36 2nd widening part 40 3rd wiring 44 notch 60 LCD display 72 3rd wiring 82 Insert