TW201528093A - Capacitance touch panel - Google Patents

Abstract

A capacitance touch panel includes a substrate, a first inductive film, a second inductive film, and a flexible printed circuit board. The first inductive film disposed on the substrate includes a first film and a plurality of first electrodes, in which the first electrodes are arranged along a first direction. The second inductive film disposed on the first inductive film includes a second film and a plurality of second electrodes, in which the second electrodes are arranged along a second direction. The first direction and the second direction are orthogonal. The flexible printed circuit board includes a linear substrate. The linear substrate is folded twice and becomes a L-shape substrate. The L-shape substrate includes a first coupling portion connected to the first inductive film, a second coupling portion connected to the second inductive film, and a folding part for interconnecting the first coupling portion and the second coupling portion.

Description

Capacitive touch panel

The present invention relates to a touch panel, and more particularly to a capacitive touch panel.

In recent years, due to the breakthrough of touch technology, mechanical button panels have gradually been replaced by touch screens, and related consumer electronic products have also been developed. In response to market demand, touch technology has been widely used in smart phones or It is a mobile device such as a tablet computer.

At present, the mainstream touch mode of smart phones or tablets is capacitive touch. The capacitive touch panel can be made of double glass bonding (Glass/Glass; GG type), double film bonding (Glass/Film/Film; GFF type) and integrated touch (One Glass Solution; OGS). achieve. For example, the double-film-bonded structure includes cutting a continuous electrode-sensing film substrate into a suitable region, sticking it to the substrate, and finally connecting through a flexible circuit board to achieve signal transmission.

The invention provides a capacitive touch panel with an L-shaped flexible circuit board, so as to reduce the usage of the flexible circuit board and facilitate Assemble.

The present invention provides a capacitive touch panel comprising a substrate, a first sensing film, a second sensing film, and a flexible circuit board. The first sensing film is disposed on the substrate, and includes a first film and a plurality of first electrodes disposed on the first film, wherein the first electrodes are arranged in parallel along a first direction. The second sensing film is disposed on the first sensing film, and includes a second film and a plurality of second electrodes disposed on the second film, wherein the second electrodes are arranged in parallel along a second direction, and the second direction is orthogonal In the first direction. The flexible circuit board comprises an elongated substrate, and the elongated substrate is bent twice to form an L-shaped substrate, and the L-shaped substrate has a first connecting portion and a second connecting with the first sensing film. The sensing film is connected to one of the second connecting portions, and a bent portion connecting the connecting portion and the second connecting portion.

The invention provides a method for manufacturing a capacitive touch panel, comprising providing a substrate, a cutting sensing film substrate, and a secondary bending strip flexible circuit board. The sensing film substrate is cut to obtain a first sensing film and a second sensing film. The first sensing film and the second sensing film are stacked on the substrate, wherein the electrode of the first sensing film runs orthogonal to the electrode of the second sensing film. The strip-shaped flexible circuit board is bent twice to obtain an L-shaped flexible circuit board. Finally, the L-shaped flexible circuit board connects the first sensing film and the second sensing film.

100‧‧‧Capacitive touch panel

102‧‧‧Substrate

110‧‧‧First sensing film

112‧‧‧First film

114‧‧‧First electrode

116‧‧‧First direction

120‧‧‧Second sensor film

122‧‧‧Second film

124‧‧‧second electrode

126‧‧‧second direction

130‧‧‧Soft circuit board

131‧‧‧Long strip substrate

132‧‧‧First fold line

133‧‧‧ second fold line

134‧‧‧L-shaped substrate

136‧‧‧First connection

138‧‧‧Second connection

140‧‧‧Bend

142‧‧‧Extension

144‧‧‧First terminal

146‧‧‧second terminal

148‧‧‧ third terminal

149‧‧‧Wire

150‧‧‧Control circuit board

152‧‧‧Protective film

154‧‧‧Insulation tape

S10-S40‧‧‧Steps

FIG. 1 is a schematic view showing an embodiment of a flexible circuit board in a capacitive touch panel of the present invention.

Fig. 2A is a schematic view showing the first bending of the elongated substrate in Fig. 1.

Fig. 2B is a schematic view showing the second bending of the elongated substrate in Fig. 1.

FIG. 3 is an exploded view of an embodiment of a capacitive touch panel of the present invention.

FIG. 4 is a schematic view showing an embodiment of a capacitive touch panel of the present invention.

FIG. 5 is a flow chart of an embodiment of a method for fabricating a capacitive touch panel of the present invention.

The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the invention. The spirit and scope of the invention are not departed.

In view of the conventional dual-film-fit capacitive touch panel, it is necessary to use a flexible circuit board to transmit signals, and since the dual-film-fit capacitive touch panel requires two-way simultaneous injection of a trace signal (Tx), it is required Two flexible boards provide trace signals, and a flexible board receives receive (Rx) signals. A total of three flexible boards are required for signal transmission, which is not conducive to system assembly and requires high cost. Accordingly, the present invention proposes an L-shaped flexible circuit board architecture to reduce the amount of flexible circuit boards and improve their system assembly.

Please refer to FIG. 1 , which is a schematic diagram of an embodiment of a flexible circuit board in a capacitive touch panel of the present invention. It should be noted that the first figure mainly shows an elongated substrate constituting one of the flexible circuit board materials, and the non-flexible circuit board as a whole, that is, the terminals on the flexible circuit board and the wires and the like are not shown in the figure. The elongated substrate 131 material may be a plastic or other insulator. The elongated substrate 131 includes a first fold line 132 and a second fold line 133, and the first fold line 132 and the second fold line 133 are substantially at an angle of 45 degrees. The first fold line 132 is a fold line in which the elongated substrate 131 is aligned when the first bend is made. The second fold line 133 is a fold line in which the elongated substrate 131 is aligned when the second bend is made.

The present invention obtains the L-shaped flexible circuit board by bending the elongated substrate 131, which will be specifically described below with reference to the drawings.

Please refer to FIG. 1 and FIG. 2A at the same time, wherein FIG. 2A is a first bending diagram of the elongated substrate in FIG. 1 . It can be seen from FIG. 2A that after the elongated substrate 131 is bent along the first fold line 132, since the angle between the first fold line 132 and the second fold line 133 is 45 degrees, the elongated substrate 131 can be seen after the bending. Right angle turn.

Please refer to FIG. 2A and FIG. 2B at the same time, wherein FIG. 2B is a second bending diagram of the elongated substrate in FIG. 2A. The L-shaped base material 134 in FIG. 2B is formed by bending the elongated base material 131 having the right-angled turning portion in FIG. 2A along the second fold line 133 for the second time.

The L-shaped base material 134 includes a first connecting portion 136, a second connecting portion 138, and a bent portion 140 that connects the first connecting portion 136 and the second connecting portion 138. There is an orthogonal relationship between the first connecting portion 136 and the second connecting portion 138.

As mentioned above, the L-shaped flexible circuit board proposed by the present invention is obtained by bending a long flexible circuit board twice. Therefore, on the manufacturing process of the flexible circuit board, since the original shape is a long strip shape, the layout utilization rate at the time of production is improved.

Please refer to FIG. 3, which is an exploded view of an embodiment of a capacitive touch panel of the present invention. The capacitive touch panel 100 includes a substrate 102 , a first sensing film 110 , a second sensing film 120 , and a flexible circuit board 130 . More specifically, the first sensing film 110 is placed on the substrate 102, and the second sensing film 120 is placed on the first sensing film 110. The flexible circuit board 130 is disposed on the first sensing film 110 and the second sensing film 120, and the first connection portion 136 of the flexible circuit board 130 is connected to the first sensing film 110, and the second connection portion of the flexible circuit board 130 138 is connected to the second sensing film 120.

The purpose of the first sensing film 110 and the second sensing film 120 is to serve as a sensing area for touch. The first sensing film 110 includes a first film 112 and a plurality of first electrodes 114, wherein the first electrodes 114 are arranged in a direction parallel to a first direction 116. The second sensing film 120 includes a second film 122 and a plurality of second electrodes 124, wherein the second electrodes 124 are arranged in a direction parallel to a second direction 126, wherein the first direction 116 and the second direction 126 are orthogonal to each other, The arrangement direction of the one electrode 114 and the second electrode 124 is also orthogonal to each other.

The material of the first film 112 and the second film 122 may be glass or plastic, and the material of the first electrode 114 and the second electrode 124 may be a transparent conductive material such as Indium Tin Oxide (ITO), or It is a metal pattern with a very thin line width. The substrate 102 may be glass or plastic, and the material of the protective film 152 may be polyethylene terephthalate (Polyethylene). Terephthalate; PET) film.

The capacitive touch panel 100 further includes a protective film 152 as a protective layer for protecting the overall structure and covering the second sensing film 120 and tangential to the flexible circuit board 130 or maintaining a gap.

Please refer to FIG. 4 again, which is a schematic diagram of an embodiment of a capacitive touch panel of the present invention.

The first electrode 114 in the figure is a lateral electrode, and the second electrode 124 is a longitudinal electrode. The trace signal passes through the first connection portion 136 of the flexible circuit board 130 through the first electrode 114 to form a uniform electric field between the first electrode 114 and the second electrode 124, and when operated by using the touch method, due to the conductor The contact of the (finger) will cause a change in the capacitance of the touch sensing area, and the second electrode 124 transmits the corresponding received signal.

The length of the first sensing film 110 in the first direction 116 is greater than the length of the second sensing film 120 in the first direction 116 such that the second sensing film 120 cannot completely cover the first sensing film 110. That is to say, the opposite ends of the first electrode 114 on the first sensing film 110 are not completely covered by the second sensing film 120. After the second sensing film 120 covers the first sensing film 110, the overall shape is substantially bilaterally symmetrical.

The first connecting portion 136 of the flexible circuit board 130 is connected to the portion of the first sensing film 110 exposed to the second sensing film 120, and the second connecting portion 138 of the flexible circuit board 130 is connected to the second sensing film 120.

The purpose of the flexible circuit board 130 is the channel communication number. The flexible circuit board 130 includes an L-shaped substrate 134, an extension portion 142, a plurality of first terminals 144, a plurality of second terminals 146, and a plurality of third terminals 148. First terminal 144 The second terminal 146 is disposed on the second connecting portion 138 , and the third terminal 148 is disposed on the extending portion 142 . The first terminal 144, the second terminal 146, and the third terminal 148 are located on the same surface of the L-shaped substrate 134, so that the flexible circuit board 130 is covered on the first sensing film 110 and the second sensing film 120, and the first terminal is The 144 and the second terminal 146 may be in contact with the first electrode 114 and the second electrode 124, respectively.

The flexible circuit board 130 further includes a plurality of wires 149 as a channel for signal transmission. The wire 149 connects the first terminal 144, the second terminal 146, and the third terminal 148 to each other. It should be noted that the first electrode 114, the second electrode 124, the first terminal 144, the second terminal 146, and the wire 149 indicated in FIG. 4 are only used to indicate the connection relationship, not the actual number.

The capacitive touch panel 100 further includes a control circuit board 150 for processing touch signals and connecting with the outside world. The control circuit board 150 and the third terminal 148 in the flexible circuit board 130 are connected to each other. The L-shaped flexible circuit board 130 allows the extensions 142 of the flexible circuit board 130 to be connected to the control circuit board 150 to be integrated on the same side of the substrate 102, thereby facilitating assembly.

The capacitive touch panel 100 further includes an insulating tape 154 that can fix and protect the flexible circuit board 130. The insulating tape 154 is placed on the bent portion 140 of the flexible circuit board 130 and fixed on the substrate 102, and is also a protective measure to prevent the bent portion 140 from being broken due to material fatigue caused by repeated bending.

Referring to FIG. 5, it is a flowchart of an embodiment of a method for fabricating a capacitive touch panel of the present invention. Step S10 includes providing a substrate and then cutting A sensing film substrate is cut to obtain a first sensing film and a second sensing film. Step S20 is to first place the first sensing film on the substrate, and then stack the second sensing film on the first sensing film, wherein the electrode of the first sensing film runs orthogonal to the electrode of the second sensing film. Step S30 is secondly bent into a strip-shaped flexible circuit board to obtain an L-shaped flexible circuit board. In step S40, the L-shaped flexible circuit boards obtained in step S30 are respectively connected to the first sensing film and the second sensing film.

It can be seen from the above embodiments that the L-shaped flexible circuit board proposed by the present invention is obtained by bending a long flexible circuit board twice. Therefore, on the manufacturing process of the flexible circuit board, since the original shape is a long strip shape, the typesetting utilization rate at the time of production is improved. Through the L-shaped flexible circuit board architecture, the flexible circuit board usage limit of the conventional double film-bonded capacitive touch panel is broken, the amount of the flexible circuit board is reduced, and the system assembly property is improved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and retouched without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Capacitive touch panel

102‧‧‧Substrate

110‧‧‧First sensing film

114‧‧‧First electrode

116‧‧‧First direction

120‧‧‧Second sensor film

124‧‧‧second electrode

130‧‧‧Soft circuit board

134‧‧‧L-shaped substrate

136‧‧‧First connection

138‧‧‧Second connection

140‧‧‧Bend

142‧‧‧Extension

144‧‧‧First terminal

146‧‧‧second terminal

148‧‧‧ third terminal

149‧‧‧Wire

150‧‧‧Control circuit board

154‧‧‧Insulation tape

Claims (10)

A capacitive touch panel comprising: a substrate; a first sensing film disposed on the substrate, comprising a first film and a plurality of first electrodes disposed on the first film, wherein the first An electrode is arranged in parallel along a first direction; a second sensing film is disposed on the first sensing film, and includes a second film and a plurality of second electrodes disposed on the second film, wherein the plurality of electrodes The second electrodes are arranged in parallel along a second direction, the second direction is orthogonal to the first direction; and a flexible circuit board comprises an elongated substrate, and the elongated substrate is formed by bending twice An L-shaped substrate having a first connecting portion connected to the first sensing film, a second connecting portion connected to the second sensing film, and connecting the first connecting portion and the first portion a bent portion of the two connecting portions. The capacitive touch panel of claim 1, wherein a length of the first sensing film along the first direction is greater than a length of the second sensing film along the first direction. The capacitive touch panel of claim 1, wherein the elongated substrate comprises a first fold line and a second fold line, and the elongated substrate is bent along the first fold line and the second fold line. An angle between the first fold line and the second fold line is 45 degrees, such that the first connecting portion of the L-shaped substrate is orthogonal to the first Two connections. The capacitive touch panel of claim 1 further comprising an insulating tape for fixing the bent portion on the substrate. The capacitive touch panel of claim 1, further comprising a control circuit board, the flexible circuit board further comprising an extension connected to the control circuit board. The capacitive touch panel of claim 5, wherein the flexible circuit board comprises a plurality of first terminals disposed on the first connection portion, a plurality of second terminals disposed on the second connection portion, and The plurality of third terminals of the extending portion, the first terminals, the second terminals and the third terminals are located on the same surface of the elongated substrate. The capacitive touch panel of claim 6, wherein the first terminals are connected to the first sensing film, the second terminals are connected to the second sensing film, the third terminals and the control circuit board The flexible circuit board further includes a plurality of wires connecting the first terminals and the second terminals to the third terminals. The capacitive touch panel of claim 1, further comprising a protective film disposed on the second sensing film. A capacitive touch panel comprising: a first sensing film is disposed on the substrate, and includes a first film and a plurality of first electrodes disposed on the first film, wherein the first electrodes are arranged in parallel along a first direction a second sensing film disposed on the first sensing film, comprising a second film and a plurality of second electrodes disposed on the second film, wherein the second electrodes are parallel along a second direction Arranging, the second direction is orthogonal to the first direction, and a length of the first sensing film along the first direction is greater than a length of the second sensing film along the first direction; and two flexible circuit boards, each of the The flexible circuit board comprises an elongated substrate, the elongated substrate is bent twice to form an L-shaped substrate, and the L-shaped substrate has a first connection portion connected to the first sensing film a second connecting portion connected to the second sensing film, and a bent portion connecting the first connecting portion and the second connecting portion, wherein the first connecting portions are located on opposite sides of the substrate, The second connecting portions are located on the same side of the substrate. A method for manufacturing a capacitive touch panel, comprising: providing a substrate; cutting a sensing film substrate to obtain a first sensing film and a second sensing film; and the first sensing film and the second sensing film Stacked on the substrate, wherein the electrode of the first sensing film is oriented orthogonal to the electrode of the second sensing film; and a long flexible circuit board is bent twice to obtain an L-shaped soft electric device. a circuit board; and connecting the L-shaped flexible circuit board to the first sensing film and the second sensing film.