TW201519044A - Touch panel and touch control module - Google Patents

Abstract

A touch control panel is provided, including a substrate, a plurality of bonding pads, and a plurality of auxiliary pads. The substrate is bonded to a flexible printed circuit by a conductive glue in a bonding area, which is defined on a surface of the substrate. The bonding pads and auxiliary pads are formed on the surface of the substrate and situated in the bonding area. At least some auxiliary pads and some bonding pads are disposed alternately. Furthermore, a touch control module is provided, including a flexible printed circuit and an aforementioned touch panel. The touch panel is electrically connected to the flexible printed circuit.

Description

Touch panel and touch module

The present invention relates to a touch panel and a touch module, and more particularly to a touch panel and a touch module that facilitate bonding with a flexible circuit board.

Generally, the touch panel transmits and communicates with the controller through a flexible circuit board. In the architecture, the touch panel and the flexible circuit board are bonded together by a conductive adhesive. In other words, the touch panel and the flexible circuit board are electrically connected and fixed to each other by the conductive adhesive.

However, since the adhesion of the conductive adhesive to the substrate of the touch panel is inferior to that of the flexible circuit board, the touch panel is relatively susceptible to external force between the touch panel and the flexible circuit board (eg, during assembly and production). The phenomenon of at least partial peeling of the conductive paste due to the influence of the whole line pulling and the reliability test after the assembly is completed, and further breaking the circuit with the flexible circuit board, thereby reducing the production yield of the product.

In view of the above, the invention is structurally improved in a region where the touch panel is used for bonding with the flexible circuit board, and the touch panel and the conductive adhesive are used when the touch panel is bonded to the flexible circuit board through the conductive adhesive. It has better adhesion between the two.

The present invention provides a touch panel comprising: a substrate, wherein a surface of the substrate is defined as a bonding region, and the substrate is bonded to a flexible circuit board through a conductive adhesive in the bonding region; a plurality of bonding terminals are formed on the surface of the substrate and located in the bonding region; A plurality of auxiliary pads are formed on the surface of the substrate and located in the bonding region, wherein at least a portion of the auxiliary pads are alternately spaced from the bonding terminals.

The present invention further provides a touch module comprising: a flexible circuit board; and a touch panel electrically connected to the flexible circuit board, and the touch panel comprises: a substrate, wherein a surface of the substrate is defined a bonding area, and the substrate is bonded to the flexible circuit board through a conductive adhesive in the bonding region; a plurality of bonding terminals are formed on the surface of the substrate and located in the bonding region; and a plurality of auxiliary pads are formed on the bonding pad The surface of the substrate is located in the joint region, and at least a portion of the auxiliary pads are arranged at an interval from the joint terminals.

Therefore, the touch panel and the touch module provided by the present invention effectively improve the bonding strength between the touch panel and the conductive adhesive through the structural design, and reduce the risk of circuit breaking of the touch panel and the flexible circuit board. In turn, the production yield of the touch module is improved, and the touch module has good product stability and quality.

1‧‧‧Touch Module

10‧‧‧Touch panel

11‧‧‧Substrate

12‧‧‧electrode layer

13‧‧‧Join terminal

14‧‧‧Auxiliary pads

15‧‧‧Wire

20‧‧‧Soft circuit board

21‧‧‧Electrical terminals

30‧‧‧ conductive adhesive

A‧‧‧ junction area

FIG. 1 is a partial top view showing a touch module according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view taken along the line x-x in Fig. 1.

3 is a cross-sectional view showing a touch module according to another embodiment of the present invention.

In the various embodiments of the invention described below, the terms "upper" and "lower" are used to denote the relative positional relationship and are not intended to limit the invention.

Referring to FIG. 1 and FIG. 2, a partial top view of a touch module according to an embodiment of the present invention and a cross-sectional view along the x-x cross-sectional line in FIG. 1 are respectively illustrated. As shown in the figure, the touch module 1 of the present embodiment includes a touch panel 10 and a Flexible Printed Circuit (FPC) 20 electrically connected to each other. The touch panel 10 includes a substrate 11 , an electrode layer 12 , a plurality of bonding pads 13 , and a plurality of auxiliary pads 14 .

A surface of the substrate 11 is defined with a bonding area A, and the substrate 11 is bonded to the flexible circuit board 20 through a conductive paste 30 on the bonding area A. The electrode layer 12 can be, for example, a transparent conductive layer formed on the substrate 11 through a patterning process for performing touch sensing of the touch panel 10. The bonding terminal 13 is formed on the surface of the substrate 11 and located in the bonding area A. In the design, the bonding terminal 13 can be electrically connected to the electrode layer 12 through a wire 15, for example, and is electrically conductive through the conductive adhesive 30. The flexible circuit board 20 is connected. The auxiliary pad 14 is formed on the surface of the substrate 11 and located in the land A. Specifically, the auxiliary pad 14 of the present embodiment is formed on the same surface of the substrate 11 as the bonding terminal 13, and at least a portion of the auxiliary pad 14 It is arranged in an alternating interval with the bonding terminals 13.

It is worth mentioning that the auxiliary pad 14 of the embodiment can be designed to be made of a conductive or non-conductive material. The specific material is as long as the adhesive of the conductive adhesive 30 to the material used is compared with the material of the substrate 11. Adhesiveness is better. For example, the auxiliary pad 14 may be the same material as the bonding terminal 13 For example, a conductive metal such as silver or copper, or the same material as the electrode layer 12, such as a conductive material such as Indium Tin Oxide (ITO). In the specific experimental data, when the material of the auxiliary pad 14 is indium tin oxide, the average tensile force between the touch panel 10 and the flexible circuit board 20 is 1.43 Newtons, and in the case where the remaining conditions are the same, only the auxiliary pad 14 is removed. The average tensile force between the touch panel 10 and the flexible circuit board 20 is reduced to 0.23 Newtons. Of course, if the auxiliary pad 14 is actually designed with a conductive material, those skilled in the art can understand that the spacing between the connecting terminal 13 and the auxiliary pad 14 is designed to be a safe distance, and the bonding terminal 13 and the auxiliary pad 14 are avoided. The capacitive coupling effect occurs, however, the actual safety distance is not limited by the present invention, and is actually adjusted in consideration of factors such as the size of the land A, the number and size of the joint terminals 13, and the material of the auxiliary pad 14 and the joint terminal 13.

In addition, since the auxiliary pad 14 can be made of the same material as the bonding terminal 13 or the electrode layer 12, the auxiliary pad 14 of the present embodiment can be formed on the same process as the bonding terminal 13 or the electrode layer 12 in the process, without increasing the entire process. Process steps of the touch module 1. Moreover, those skilled in the art can understand that generally, in the process of the bonding terminal 13 or the electrode layer 12 of the touch panel 10, a target film is usually used for sputtering deposition to form a whole film layer, and then removed by etching. The unnecessary area, and finally the remaining area is used to achieve the desired function, so the present embodiment can reduce the area of the etching removal by increasing the design of the auxiliary pad 14 of the same material as the bonding terminal 13 or the electrode layer 12, effectively Reduce material waste.

After the touch panel 10 of the present embodiment is bonded to the flexible circuit board 20 through the conductive adhesive 30, the bonding terminal 13 and the auxiliary pad 14 are located on the substrate 11 and the conductive adhesive. Between 30, in other words, this one The structure can reduce the area in which the substrate 11 directly contacts the conductive paste 30. In this way, since the material of the auxiliary pad 14 of the embodiment has better adhesion to the conductive adhesive 30 than the material of the substrate 11, the touch panel 10 and the conductive adhesive can be reduced when subjected to an external force. The chance of peeling occurs 30, and the circuit connection between the touch panel 10 and the flexible circuit board 20 is stably maintained.

Based on the foregoing design structure of the auxiliary pad 14, in another embodiment, more auxiliary pads 14 can be designed on the surface of the substrate 11 and located in the bonding area A, so that the additional designed auxiliary pads 14 are not Under the circuit connection between the touch panel 10 and the flexible circuit board 20, a region other than the bonding terminal 13 and the original auxiliary pad 14 in the bonding area A is disposed in a regular or irregular manner, thereby further reducing the substrate 11 The area of the conductive adhesive 30 is directly contacted, and the bonding strength between the conductive adhesive 30 and the touch panel 10 is further improved.

It is further noted that the flexible circuit board 20 includes a plurality of conductive terminals 21. When the flexible circuit board 20 is bonded to the touch panel 10 through the conductive adhesive 30, the conductive terminals 21 can be electrically connected through the conductive adhesive 30. The joint terminal 13 of the control panel 10 is provided. The conductive adhesive 30 used in this embodiment is anisotropically conductive because the conductive adhesive 30 is disposed between the touch panel 10 and the flexible circuit board 20 in a practical manner. The colloid of the material prevents the conductive terminals 13 and the conductive auxiliary pads 14 which are alternately arranged on the touch panel 10 from being electrically connected to each other, and the conductive terminals 21 of the flexible circuit board 20 are not mutually connected to each other. Conducted and electrically shorted.

Furthermore, in the touch module 1 of the present embodiment, the bonding terminals 13 of the touch panel 10 and the conductive terminals 21 of the flexible circuit board 20 are, for example, designed to have the same size in size (length and width), and thus 2, the joint terminal 13 and the guide The electrical terminals 21 are aligned and correspondingly disposed. Of course, considering the actual process, there may be a problem of alignment tolerance. The size between the actual bonding terminal 13 and the conductive terminal 21 can be designed according to requirements, and is not limited.

Please refer to FIG. 3 , which is a cross-sectional view of the touch module according to another embodiment of the present invention, which is corresponding to the cross-sectional position of FIG. 2 . As shown in the figure, this embodiment assumes the architecture of the touch module 1 fabricated under the alignment tolerance of the process. The difference between this embodiment and the embodiment of FIG. 2 is only that the bonding terminal 13 and the conductive terminal 21 are correspondingly arranged to form a partial overlap. In this structure, since the auxiliary pad 14 for improving the bonding strength is disposed independently of the electrode layer 12 and the bonding terminal 13, if the auxiliary pad 14 is designed with a conductive material, the auxiliary pad 14 does not affect the touch panel. 10 and the circuit connection between the flexible circuit boards 20.

Finally, in the foregoing embodiments, the substrate 10 mentioned may be, for example, a transparent substrate such as glass, plastic, film, or the like, and further, the transparent substrate is further reinforced and has both load bearing and protection. Substrate. In addition, the electrode layer 12 can be made of, for example, a transparent conductive material such as Indium Tin Oxide, Aluminum Zinc Oxide, or Indium Gallium Aluminum Oxide, and the electrode layer 12 is further Designed as a single or multiple layer of transparent conductive layer. Furthermore, the electrode pattern formed by the patterning process of the electrode layer 12 may be a long strip-shaped, continuous continuous diamond shape. The various embodiments described above are not intended to be limiting of the invention.

In summary, the present invention structurally improves the bonding area of the substrate of the touch panel, and adds the auxiliary pad to allow the touch panel to be bonded to the flexible circuit board through the conductive adhesive, and the touch panel and the conductive adhesive Better adhesion between force. Therefore, the invention can effectively improve the bonding strength between the touch panel and the conductive adhesive, reduce the risk of circuit breaking of the touch panel and the flexible circuit board, thereby improving the production yield of the touch module and allowing the touch. The control module has good product stability and quality.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. Those skilled in the art having the ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

1‧‧‧Touch Module

10‧‧‧Touch panel

11‧‧‧Substrate

12‧‧‧electrode layer

14‧‧‧Auxiliary pads

15‧‧‧Wire

20‧‧‧Soft circuit board

21‧‧‧Electrical terminals

A‧‧‧ junction area

Claims (15)

A touch panel includes: a substrate, wherein a surface of the substrate is defined by a bonding region, and the substrate is bonded to a flexible circuit board through a conductive adhesive; the plurality of bonding terminals are formed on the substrate The surface of the substrate is located in the joint region; and a plurality of auxiliary pads are formed on the surface of the substrate and located in the joint region, wherein at least some of the auxiliary pads are arranged at an interval from the joint terminals. The touch panel of claim 1, wherein the auxiliary pads are electrically conductive or non-conductive materials. The touch panel of claim 1, wherein the auxiliary pads and the bonding terminals are made of the same material. The touch panel of claim 1, further comprising an electrode layer formed on the substrate and electrically connecting the bonding terminals through a wire. The touch panel of claim 4, wherein the auxiliary pads and the electrode layer are made of the same material. The touch panel of claim 1, wherein the bonding terminals and the auxiliary pads are located between the substrate and the conductive paste. The touch panel of claim 1, wherein the bonding terminals are electrically connected to the flexible circuit board through the conductive adhesive. A touch module includes: a flexible circuit board; and a touch panel electrically connected to the flexible circuit board, and the touch panel includes: a substrate, wherein a surface of the substrate is defined by a bonding area, and the substrate passes through the bonding area a conductive adhesive to be bonded to the flexible circuit board; a plurality of bonding terminals formed on the surface of the substrate and located in the bonding region; and a plurality of auxiliary pads formed on the surface of the substrate and located in the bonding region, at least a portion thereof The auxiliary pads are arranged at an interval from the bonding terminals. The touch panel of claim 8, wherein the flexible circuit board further comprises a plurality of conductive terminals, and the conductive terminals are electrically connected to the joint terminals through the conductive adhesive. The touch module of claim 8, wherein the bonding terminals and the auxiliary pads are located between the substrate and the conductive paste. The touch module of claim 8, wherein the auxiliary pads are electrically conductive or non-conductive materials. The touch module of claim 8, wherein the auxiliary pads and the bonding terminals are made of the same material. The touch module of claim 8, wherein the touch panel further comprises an electrode layer formed on the substrate, and the connection terminals are electrically connected by a wire. The touch module of claim 13, wherein the auxiliary The pad is made of the same material as the electrode layer. The touch module of claim 8, wherein the conductive paste has an anisotropic conductive material.