CN103268181B - Capacitive touch screen module and preparation method thereof - Google Patents

Abstract

A capacitive touch screen module and a preparation method thereof relate to a touch screen. The capacitive touch screen module is provided with a substrate, a cover plate and a flexible circuit board; a lower transparent conductive film is deposited on the lower surface of the substrate, and a lower circuit pattern and a lower conductive electrode are prepared on the lower transparent conductive film. An upper transparent conductive film is deposited on the upper surface of the upper transparent conductive film, and an upper circuit pattern and an upper conductive electrode are prepared on the upper transparent conductive film; a transparent insulating layer is provided on the cover plate, and a transparent insulating layer is prepared on the non-visible area of the cover plate The color coating is provided with an external electrode on the color coating; the cover plate is bonded to the lower transparent conductive film through a transparent insulating layer, and the external electrode is connected to the lower conductive electrode in corresponding contact; both the external electrode and the upper conductive electrode are provided with There is a conductive adhesive layer; the flexible circuit board is bound to the upper conductive electrode and the external electrode.

Description

Capacitive touch screen module and preparation method thereof

technical field

The invention relates to a touch screen, in particular to a capacitive touch screen module and a preparation method thereof.

Background technique

As a new type of human-computer interaction interface, touch screen is widely used in various digital information systems. The traditional manufacturing method of capacitive touch screen modules on the market is to first bind the flexible circuit board to the capacitive screen substrate, and then bond the capacitive screen substrate and the cover plate to form a module. Since the driving and receiving patterns of the capacitive screen are respectively made on the two surfaces of the substrate, it is necessary to use two binding processes to complete the binding of the flexible circuit board to the two surfaces of the capacitive screen substrate, and it is necessary to bend the flexible circuit board. The second binding will cause the flexible circuit board to be disconnected, thus affecting the yield rate, production efficiency and production cost of the capacitive screen module. Therefore, how to reduce the binding process of the flexible circuit board and the capacitive screen in the process of making the capacitive touch screen module, reduce the complexity of the manufacturing technology, improve production efficiency and product yield, reduce the production cost of the module, etc., are the problems that the present invention needs to solve. The problem.

Chinese patent 201110137392.2 discloses a capacitive touch screen, comprising an ITO glass substrate with a printed circuit layer on the front, and a PET film pasted on the outer surface of the printed circuit layer. Also provided is the preparation method of the above-mentioned capacitive touch screen, including: a binding step, forming a printed circuit layer on the ITO glass substrate, and then binding the flexible circuit board to the ITO glass substrate to connect with the printed circuit layer; Paste on the surface of the PET film, cut the PET film into small pieces matching the size of the ITO glass substrate, and paste the small piece of PET film on the outer surface of the printed circuit layer on the ITO glass substrate. This invention replaces the traditional glass cover plate with PET film, greatly simplifies the equipment and process operation of the bonding process, and has low cost and high efficiency, which is suitable for mass production; the bonding of PET film belongs to the method of soft and hard, and the product yield rate It can reach more than 99%.

Contents of the invention

The purpose of the present invention is to solve the problems of how to reduce the binding process between the flexible circuit board and the capacitive screen, reduce the complexity of the manufacturing technology, improve production efficiency and product yield, and reduce the production cost of the module in the process of manufacturing the capacitive touch screen module. Provided are a capacitive touch screen module and a preparation method thereof.

The capacitive touch screen module is provided with a base plate, a cover plate and a flexible circuit board (FPC);

A lower transparent conductive film is deposited on the lower surface of the substrate, a lower circuit pattern and a lower conductive electrode are prepared on the lower transparent conductive film, an upper transparent conductive film is deposited on the upper surface of the substrate, and an upper transparent conductive film is prepared on the upper transparent conductive film. There is an upper circuit pattern and an upper conductive electrode; the cover plate is provided with a transparent insulating layer, a color coating is prepared on the non-visible area of the cover plate, and an external electrode is arranged on the color coating; the cover plate The transparent insulating layer is bonded to the lower transparent conductive film, and the external electrode is in contact with the lower conductive electrode; a conductive adhesive layer is provided on the external electrode and the upper conductive electrode; the flexible circuit board (FPC) is connected to the upper conductive electrode and the upper conductive electrode. External electrode binding.

The substrate can be one of tempered glass plate, strengthened glass plate, ordinary glass plate, transparent plate of polymer material and the like.

The cover plate can be one of tempered glass plate, strengthened glass plate, ordinary glass plate, transparent plate made of polymer material and the like.

The transparent conductive film can be prepared by using ITO film, graphene film, carbon nanotube and transparent conductive material film.

The color coating can be ink coating, varnish coating or frame glue coating of various colors and the like.

The external electrode material can be selected from materials with strong electrical conductivity, such as carbon paste or silver paste.

The transparent insulating glue can be selected from various UV glues such as OCA, LOCA, and OCR.

The conductive glue layer can be selected from ACF, ACP, ACA glue and the like.

The preparation method of described capacitive touch screen module, comprises the following steps:

1) Depositing a transparent conductive film on the lower surface of the substrate, and depositing a transparent conductive film on the upper surface of the substrate;

2) Prepare a circuit pattern layer and a lower conductive electrode on the lower transparent conductive film, and prepare a circuit pattern layer and an upper conductive electrode on the upper transparent conductive film;

3) Prepare a layer of color coating on the non-visible area of the cover plate;

4) Prepare external electrodes on the surface of the color coating;

5) Prepare a transparent insulating adhesive layer on the cover plate;

6) After the product eliminates air bubbles, attach the base plate to the cover plate and connect the conductive electrodes to the external electrodes to ensure that the electrical signal is normal during transmission;

7) Prepare a conductive adhesive layer on the external electrode on the cover plate and the upper conductive electrode on the substrate;

8) Bind the flexible circuit board (FPC) with the upper conductive electrode and the external electrode to obtain a capacitive touch screen module.

In step 4), the method for preparing external electrodes on the surface of the color coating can be through a screen printing process, and the function of the external electrodes is to connect to an external control circuit.

In step 5), the transparent insulating adhesive layer and the external electrodes are preferably on the same horizontal plane to ensure that the substrate and the cover plate are in a relatively parallel state after bonding.

In step 8), the upper conductive electrode and the outer electrode are on the same side of the cover plate, so the bonding of the flexible circuit board (FPC) and the substrate can be completed at one time.

The invention deposits a transparent conductive film on both surfaces of the substrate, and prepares a corresponding transparent pattern layer and a conductive electrode on the transparent conductive film; prepares a color coating on the non-visible area of the cover plate, and coats the color coating Prepare an external electrode on the layer; prepare a transparent insulating adhesive layer on the cover plate in addition to the external electrode; attach the substrate to the cover plate, and make the conductive electrode on one surface of the substrate and the The external electrodes on the substrate are correspondingly contacted and connected; a conductive adhesive layer is prepared on the conductive electrodes on the other surface of the substrate and the external electrodes of the cover plate; finally, on the conductive adhesive A flexible circuit board (FPC) is prepared on the layer.

Since the external electrode of the cover plate and the conductive electrode of the substrate are on the same side of the cover plate, the connection between the FPC and the conductive electrode can be realized by one heat press: a part of the connection On the external electrode of the cover plate, another part is on the conductive electrode of the substrate. After bonding the base plate and the cover plate, an air bubble elimination process is also performed.

Description of drawings

FIG. 1 is a structural composition diagram of a substrate, a transparent conductive film and an upper transparent conductive film.

Fig. 2 is a plan view of the structural composition of the upper transparent conductive film, the lower conductive electrode and the upper conductive electrode.

FIG. 3 is a cross-sectional view along line A-A of FIG. 2 .

In FIGS. 2 and 3 , the dashed-line frame is the lower conductive electrode, and the solid-line frame is the upper conductive electrode.

Figure 4 is a plan view of the color coating. In Figure 4, the shaded part is a non-visible area.

Fig. 5 is a B-B sectional view of Fig. 4 .

Fig. 6 is a plan view of the structural composition of the color coating and the external electrodes.

Fig. 7 is a C-C sectional view of Fig. 6 .

Fig. 8 is a plan view of the structural composition of the transparent insulating glue layer, the external electrodes and the color coating.

FIG. 9 is a D-D sectional view of FIG. 8 .

10 is a plan view of the structural composition of the color coating, the upper transparent conductive film, the external electrodes, the conductive electrodes and the upper conductive electrodes.

FIG. 11 is a sectional view along line E-E of FIG. 10 .

Fig. 12 is a plan view of the structural composition of the color coating, the upper transparent conductive film, the conductive adhesive layer and the conductive electrodes.

FIG. 13 is a cross-sectional view along line F-F of FIG. 12 .

Fig. 14 is a plan view of the structural composition of the color coating, the upper transparent conductive film, the flexible circuit board (FPC) and the conductive electrodes.

Fig. 15 is a G-G sectional view of Fig. 14 .

detailed description

As shown in FIGS. 1-15 , the embodiment of the capacitive touch screen module includes a substrate 008 , a cover 001 and a flexible circuit board (FPC) 011 . A lower transparent conductive film 007 is deposited on the lower surface of the substrate 008, a lower circuit pattern and a lower conductive electrode 006 are prepared on the lower transparent conductive film 007, and an upper transparent conductive film 009 is deposited on the upper surface of the substrate 008. An upper circuit pattern and an upper conductive electrode 010 are prepared on the upper transparent conductive film 009; a transparent insulating layer 004 is provided on the cover plate 001, and a color coating 002 is prepared on the non-visible area of the cover plate 001. The coating 002 is provided with an external electrode 003; the cover plate 001 is bonded to the lower transparent conductive film 007 through the transparent insulating layer 004, and the external electrode 003 is connected to the lower conductive electrode 006; the external electrode 003 and the upper conductive electrode 010 A conductive adhesive layer 005 is provided on the top; the flexible circuit board (FPC) 011 is bound to the upper conductive electrode 010 and the external electrode 003 .

The preparation method of described capacitive touch screen module, comprises the following steps:

1) Deposit a transparent conductive film 007 on the lower surface of the substrate 008, and deposit a transparent conductive film 009 on the upper surface of the substrate 008, as shown in FIG. 1 ;

2) Prepare the circuit pattern layer and the lower conductive electrode 006 on the lower transparent conductive film 007, prepare the circuit pattern layer and the upper conductive electrode 010 on the upper transparent conductive film 009 (as shown in Figures 2 and 3, Figure 2 is a plan view, Figure 3 is a cross-sectional view; the dotted line frame is the lower conductive electrode 006, and the solid line frame is the upper conductive electrode 010);

3) Prepare a layer of color coating 002 on the non-visible area of the cover plate 001 (the shaded part in Figure 4 is the non-visible area, Figure 4 is a plan view, and Figure 5 is a cross-sectional view);

4) Prepare the external electrode 003 on the surface of the color coating 002; the method for preparing the external electrode 003 on the surface of the color coating 002 can be through a screen printing process, and the function of the external electrode 003 is to connect an external control circuit. FIG. 6 is a plan view, and FIG. 7 is a cross-sectional view.

5) Prepare a transparent insulating adhesive layer 004 on the cover plate 001; the transparent insulating adhesive layer 004 and the external electrode 003 are preferably on the same horizontal plane to ensure that the substrate 008 and the cover plate 001 are in a relatively parallel state after bonding; the transparent insulating adhesive layer The glue layer 004 can use OCA glue, because this glue has the advantages of good light transmittance, high temperature resistance, and not easy to yellow and deteriorate; in Figure 8, the transparent insulating glue layer 004 is inside the dotted line frame; Sectional view.

6) After the product eliminates air bubbles, attach the substrate 008 to the cover plate 001 and connect the conductive electrode 006 to the external electrode 003 to ensure that the electrical signal is normal during transmission. Figure 10 is a plan view, and Figure 11 is a cross-sectional view.

7) Prepare a conductive adhesive layer 005 on the external electrode 003 on the cover plate 001 and the upper conductive electrode 010 on the substrate 008; the conductive adhesive layer 005 can use ACF adhesive, which is characterized by Z-axis electrical conduction and XY Plane insulation, Figure 12 is a plan view, and Figure 13 is a cross-sectional view.

8) Bind the flexible circuit board (FPC) 011 with the upper conductive electrode 010 and the external electrode 003 to obtain a capacitive touch screen module. The upper conductive electrode 010 and the external electrode 003 are on the same side of the cover plate 001, so the binding of the flexible circuit board (FPC) 011 and the substrate 008 can be completed at one time; FIG. 14 is a plan view, and FIG. 15 is a cross-sectional view.

The substrate can be one of tempered glass plate, strengthened glass plate, ordinary glass plate, transparent plate of polymer material and the like.

The cover plate can be one of tempered glass plate, strengthened glass plate, ordinary glass plate, transparent plate made of polymer material and the like.

The transparent conductive film can be prepared by using ITO film, graphene film, carbon nanotube and transparent conductive material film.

The color coating can be ink coating, varnish coating or frame glue coating of various colors and the like.

The external electrode material can be selected from materials with strong electrical conductivity, such as carbon paste or silver paste.

The transparent insulating glue can be selected from various UV glues such as OCA, LOCA, and OCR.

The conductive glue layer can be selected from ACF, ACP, ACA glue and the like.

The shape of the external conductive electrode and the conductive electrode may be a rectangle, a square, a circle, an ellipse, and the like.

Claims (7)

1. A capacitive touch screen module, characterized in that it is provided with a substrate, a cover plate and a flexible circuit board; A lower transparent conductive film is deposited on the lower surface of the substrate, a lower circuit pattern and a lower conductive electrode are prepared on the lower transparent conductive film, an upper transparent conductive film is deposited on the upper surface of the substrate, and an upper transparent conductive film is prepared on the upper transparent conductive film. There is an upper circuit pattern and an upper conductive electrode; the cover plate is provided with a transparent insulating layer, a color coating is prepared on the non-visible area of the cover plate, and an external electrode is arranged on the color coating; the cover plate The substrate is bonded on the cover plate through the transparent insulating layer and the lower transparent conductive film, and the substrate partially covers the external electrodes; in the direction perpendicular to the lower surface of the substrate, the The part of the external electrode covered by the substrate is correspondingly connected to the lower conductive electrode; the part of the external electrode not covered by the substrate and the upper conductive electrode are provided with a conductive adhesive layer; the flexible circuit board is connected to the upper conductive electrode and the external electrode. binding; The transparent conductive film is prepared from ITO film, graphene film, carbon nanotube and transparent conductive material film; The external electrode material is selected from carbon paste or silver paste. 2. The capacitive touch screen module as claimed in claim 1, wherein the substrate adopts one of tempered glass plate, strengthened glass plate, ordinary glass plate, and polymer material transparent plate; the cover plate adopts tempered glass It is one of glass plate, strengthened glass plate, ordinary glass plate, and polymer material transparent plate. 3. The capacitive touch screen module according to claim 1, characterized in that the color coating is ink coating, varnish coating or frame glue coating of various colors. 4. The capacitive touch screen module according to claim 1, wherein the transparent insulating layer is selected from various UV glues such as OCA, LOCA, and OCR; the conductive adhesive layer can be selected from ACF, ACP, and ACA glue. 5. The method for preparing a capacitive touch screen module according to any one of claims 1 to 4, comprising the following steps: 1) Depositing a transparent conductive film on the lower surface of the substrate, and depositing a transparent conductive film on the upper surface of the substrate; 2) preparing a lower circuit pattern and a lower conductive electrode on the lower transparent conductive film, and preparing an upper circuit pattern and an upper conductive electrode on the upper transparent conductive film; 3) Prepare a layer of color coating on the non-visible area of the cover plate; 4) Prepare external electrodes on the surface of the color coating; 5) preparing a transparent insulating layer on the cover plate; 6) After the product eliminates air bubbles, attach the base plate to the cover plate and connect the conductive electrodes to the external electrodes to ensure that the electrical signal is normal during transmission; 7) Prepare a conductive adhesive layer on the external electrode on the cover plate and the upper conductive electrode on the substrate; 8) Binding the flexible circuit board with the upper conductive electrode and the external electrode to obtain a capacitive touch screen module; the upper conductive electrode and the external electrode are on the same side of the cover plate, and the binding of the flexible circuit board and the substrate is completed at one time . 6. The preparation method of the capacitive touch screen module as claimed in claim 5, characterized in that in step 4), the method of preparing the external electrodes on the surface of the color coating is through a screen printing process. 7. The preparation method of the capacitive touch screen module as claimed in claim 5, characterized in that in step 5), the transparent insulating layer and the external electrode are on the same horizontal plane to ensure that the substrate and the cover plate are relatively parallel after being bonded. state.