FPC of a capacitive touchscreen and a method for mounting the FPC

An FPC of a capacitive touchscreen and a method for mounting the FPC. The FPC comprises a sensing circuit and a driving circuit which respectively matches with a sensing circuit layer and a driving circuit layer of a capacitive touchscreen panel and have several contacts for matching the sensing circuit layer and the driving circuit layer for corresponding connection; an IC driving chip, disposed between the sensing circuit and the driving circuit. The sensing circuit and the driving circuit are disposed in parallel or on the same line. The sensing circuit or the driving circuit is provided with a bending area, and the sensing circuit or the driving circuit is able to be turned towards the driving circuit or the sensing circuit, so as to allow the sensing circuit to match the sensing circuit layer and allow the driving circuit to match the driving circuit layer. According to the present invention, the FPCs of the capacitive touchscreen can be compactly arranged on a substrate, so that the utilization rate of the substrate is greatly increased and the cost is reduced.

FIELD OF THE INVENTION

The invention relates to flexible circuit board design field, especially relates to an FPC of a capacitive touchscreen and a method for mounting the FPC.

BACKGROUND ART

The structure of a capacitive touchscreen in prior art shown inFIG. 1mainly comprises a capacitive touchscreen panel1′ and a flexible circuit board2′, the flexible circuit board2′ is covered by a cover board3′ . Wherein, the capacitive touchscreen panel (sensor) comprises an insulating transparent substrate, a sensing circuit layer and a driving circuit layer. The insulating transparent substrate is made of glass or plastic film; the sensing circuit layer is formed by a transparent conductive film having a sensing circuit or glass; the driving circuit layer is formed by transparent conductive film having driving circuit or glass, and the driving circuit layer and the sensing circuit layer are respectively arranged on both sides of the insulating transparent substrate. The flexible circuit board, called soft board or FPC (Flexible Printed Circuit) for short, is a superexcellent flexible printed circuit board produced by polyimide or polyester film as a substrate, which has high reliability and has characteristics of free bending, strong bending performance, free folding, free winding, anti-slitting, high wiring density, light weight, thin thickness, etc.

The structure of an FPC of the capacitive touchscreen in prior art is shown inFIG. 2, in which the flexible circuit board2′ comprises a sensing circuit5′ and a driving circuit6′ which respectively match a sensing circuit layer and a driving circuit layer of a capacitive touchscreen panel1′, the sensing circuit5′ is arranged perpendicular to the driving circuit6′, the sensing circuit5′ and driving circuit6′ have several contacts9′ for matching the sensing circuit layer and the driving circuit layer for corresponding connection. The sensing circuit5′ and the driving circuit6′ have an IC driving chip4′ disposed therebetween, which has a communication end8′ for communicating with communication devices such as mobile phones. The sensing circuit5′ and the driving circuit6′ are respectively laminated with the sensing circuit layer and the driving circuit layer of a capacitive touchscreen panel1′ and connected therewith, and allow the corresponding contacts to connect with each other. While such an FPC is being cut on the substrate7′, as shown inFIG. 3, since the sensing circuit5′ is perpendicular to the driving circuit6′, this arrangement may occupy a large space, which is not in favor of making a compact arrangement and may waste substrate, so as to cause a high cost.

SUMMARY OF THE INVENTION

Thus, the present invention is to solve the problem that the FPC of the capacitive touchscreen of prior art may occupy a large space, which is not in favor of making a compact arrangement, so as to waste substrate, lower the utilization rate of a substrate and cause a high cost, thereby providing an FPC of a capacitive touchscreen that is able to be arranged on the substrate in a compact manner, achieve a high utilization rate of a substrate and save the cost, and also provide a method of mounting the FPC,

To solve the above mentioned problem, the present invention provides A FPC of a capacitive touchscreen, comprises a sensing circuit and a driving circuit, which respectively match with a sensing circuit layer and a driving circuit layer of a capacitive touchscreen panel and have several contacts for matching the sensing circuit layer and the driving circuit layer for corresponding connection; an IC driving chip, disposed between the sensing circuit and the driving circuit; wherein, the sensing circuit and the driving circuit are disposed in parallel or on the same line; the sensing circuit or the driving circuit is provided with a bending area, and the sensing circuit or the driving circuit is able to be turned towards the driving circuit or the sensing circuit, so as to allow the sensing circuit to match the sensing circuit layer and allow the driving circuit to match the driving circuit layer, a bending portion is located in the bending area after being turned over.

Preferably, side lines of the sensing circuit and the driving circuit, where the contacts are provided, are located on the same line.

Preferably, the bending area is arranged on the driving circuit and close to the IC driving chip.

Preferably, the contacts are not located in the bending area.

Preferably, the side lines of the sensing circuit and driving circuit, where no contact is provided, are located on different lines.

Preferably, after the sensing circuit or driving circuit are turned over, the sensing circuit is perpendicular to the driving circuit.

The present invention also discloses a method for mounting the FPC mentioned above to a capacitive touchscreen, includes

Step 1: laminating the sensing circuit or driving circuit of the FPC together with the corresponding sensing circuit layer or driving circuit layer of a capacitive touchscreen panel of a capacitive touchscreen;

Step 2: turning the driving circuit or sensing circuit which is not laminated in the direction perpendicular to the sensing circuit or driving circuit, and a bending portion generated by turning is located in the bending area;

Step 3: laminating the turned driving circuit or the sensing circuit together with the corresponding driving circuit layer or sensing circuit layer of capacitive touchscreen panel together, so as to complete assembling of the FPC.

Preferably, comprises a step of flattening the sensing circuit and the driving circuit, prior to the step 1.

Preferably, side lines of the sensing circuit and the driving circuit, where the contacts are provided, are located on the same line; and side lines of the sensing circuit and driving circuit, where no contact is provided, are located on different lines.

Preferably, the bending area is arranged on the driving circuit and close to the IC driving chip.

Compared with prior art, the technical proposal of the invention has advantage of that:

(1) According to the FPC of the capacitive touchscreen of the invention, the sensing circuit and the driving circuit are disposed in parallel or located on the same line, the sensing circuit or the driving circuit can be turned towards the driving circuit or the sensing circuit, so that the sensing circuit matches the sensing circuit layer and the driving circuit matches the driving circuit layer. Since the FPC circuit board has characteristics of free bending, folding, wrapping, anti-slitting etc., after lamination, the FPC can be freely arranged according to the internal space of the product, which is like a conducting wire. This will not affect the normal use of the product; meanwhile, the FPC with such arrangement can save space, so as to achieve a compact arrangement on the substrate while being cut, so that the utilization rate of a substrate is greatly increased by approximately 160%, and the cost is greatly reduced.

(2) According to the FPC of a capacitive touchscreen of the invention, the side lines of the sensing circuit and the driving circuit having the contacts are located on the same line, so as to make the structure of the product regular and easy to cut, meet the requirements of the capacitive touchscreen, and ensure reliable contact among the contacts.

(3) According to the FPC of a capacitive touchscreen of the invention, the bending area is arranged on the driving circuit and close to the IC driving chip, the FPC with such arrangement is easy to bend, and the bending FPC can meet the requirements of the product, the product quality is ensured.

(4) According to the FPC of a capacitive touchscreen of the invention, the contacts are not provided in the bending area; on one hand, since the bending area is not necessary to contact the sensing circuit layer and driving circuit layer of the capacitive touchscreen panel, no contact is arranged, which may avoid of wasting of material and save the cost; on the other hand, the bending area without contacts arranged therein is in favor of bending operation.

(5) According to the FPC of a capacitive touchscreen of the invention, simply turning the driving circuit or sensing circuit in the direction perpendicular to the sensing circuit or driving circuit can let the FPC meet the requirements of the capacitive touchscreen products, this turning is easy to operate and the cost is reduced.

NUMERAL REFERENCE IN FIGURES IS AS FOLLOWS

DETAILED DESCRIPTION

A preferable embodiment of the FPC of a capacitive touchscreen of the invention is shown inFIG. 4, FPC (Flexible Printed Circuit), i.e. flexible circuit board, is called soft board for short.

The FPC2comprises a sensing circuit5and a driving circuit6which respectively matches with a sensing circuit layer and a driving circuit layer of a capacitive touchscreen panel and have several contacts9for matching the sensing circuit layer and the driving circuit layer for corresponding connection; an IC driving chip4disposed between the sensing circuit5and the driving circuit6, which has a communication end8for communicating with communication devices such as mobile phones.

The sensing circuit5and the driving circuit6are disposed in parallel or on the same line. The sensing circuit5or the driving circuit6is provided with a bending area10arranged in a position near the IC driving chip4on the driving circuit6. The contacts9are not in the bending area10. The sensing circuit5or the driving circuit6is able to be turned towards the driving circuit6or the sensing circuit5, so as to allow the sensing circuit5to match the sensing circuit layer and allow the driving circuit6to match the driving circuit layer, a bending portion11is located in the bending area10after being turned over, as shown inFIG. 5. In the present embodiment, the bending sensing circuit5arranged in Y direction is perpendicular to the driving circuit6arranged in X direction.

In the present embodiment, side lines of the sensing circuit5and driving circuit6where all contacts9are provided, are located on the same line, and side lines where no contacts9are provided are located on different lines. As shown inFIG. 6, when being cut, the FPC of capacitive touchscreen of the invention occupies little space and is arranged compactly on the substrate7, so that the utilization rate of the substrate is greatly increased and the cost is reduced.

The method for mounting the FPC to a capacitive touchscreen includes

Step 1: laminating the sensing circuit5or driving circuit6of the FPC together with the corresponding sensing circuit layer or driving circuit layer of the capacitive touchscreen panel of the capacitive touchscreen, wherein, the driving circuit6and the sending circuit layer of the capacitive touchscreen are preferably firstly laminated together;

step 2: turning over the driving circuit6or sensing circuit5which is not laminated in the direction perpendicular to the sensing circuit5or driving circuit6, and a bending portion11is located in the bending area10after being turned over; wherein, in the present embodiment, preferably, the sensing circuit5and the driving circuit6is flat enough, the sensing circuit5which has not been laminated is turned towards the direction perpendicular to the driving circuit6and the bending portion11is located in the bending area10after being turned over.

Step 3: laminating the turned driving circuit6or the sensing circuit5together with the corresponding driving circuit layer or sensing circuit layer of capacitive touchscreen panel, so as to complete assembling of the FPC, wherein, in the present embodiment, preferably, the turned sensing circuit5and the corresponding driving circuit layer of capacitive touchscreen panel are laminated together, so as to complete assembling of the FPC.

As alternative embodiments, the method further comprises a step of flattening the sensing circuit5and the driving circuit6prior to the step 1, so as to try to locate the sensing circuit5and the driving circuit6on the same surface.

In other embodiments, the location of the sensing circuit5and the driving circuit6is determined by the sample figure of the sensor panel design of different products, in other words, after being bent, the sensing circuit5also can be arranged in X direction as required, and the driving circuit6also can be arranged in Y direction.

In other embodiments, according to the actual requirements of the products, bending area10also can be arranged on the sensing circuit5and close to the IC driving chip4, as long as the actual requirements of the products can be met.

Obviously, the above-described embodiments are only examples for clear description, and are not restriction of the mode of enforcement. For ordinary skill men in the field, other changes can be made in different forms on the basis of the above description. There is no need to explain all embodiments here. And the apparent changes or variations still drop the protection scope of the invention.