TW201314537A - Capacitive touch panel structure - Google Patents

Abstract

The invention provides a capacitive touch panel structure. The capacitive touch panel includes only one substrate. A lower surface of the substrate, opposite to the touch surface, includes a capacitive sensor-circuit conductive film, a silkscreen decorative-pattern layer and a leading-out wire layer in order. The leading-out wire layer passes through the silkscreen decorative-pattern layer and connects with the capacitive sensor-circuit conductive film, and then connects to an IC by a flexible circuit board. The present invention provides the touch panel with single substrate has effective results as follows. Substrate and pressure sensitive adhesive are greatly decreased. The manufacturing processes are reduced, so that the producing cost is saved and also prompts the development of environment-protective in capacitive touch panel industry. Furthermore, the thickness of product is thinner, so that slim design of the Human-Computer Interaction is satisfied more conveniently.

Description

Capacitive touch screen structure

The invention relates to a capacitive touch screen, in particular to a structurally refined capacitive touch screen.

The touch screen is a simple, convenient and natural human-computer interaction device that has been widely used in various places. There are many types of touch screens, which are mainly divided into resistive, capacitive, infrared and surface acoustic waves. The capacitive touch screen is a coordinate of a touched position of the detector by using an induced current generated by a change in capacitance generated by electrostatic coupling between an electrode on the glass substrate and the human body. The induction principle uses voltage to act on the four corners of the screen sensing area and form a fixed electric field. When the finger touches the screen, the electric field can induce current. By means of the controller, the contact can be calculated according to the difference of the four corners of the current. position.

At present, it is known that the capacitive touch screen screen structure is composed of two, three or more layers of substrate materials, and then connected to the IC through a flexible circuit board, and the uppermost substrate material is used as a decorative cover of the capacitive touch screen, and the back screen is printed thereon. Ink and pattern, made of glass, tempered glass or PET film. The lower layer or two layers of the substrate are used as the sensor portion of the capacitive touch screen, and the surface of the substrate is provided with a conductive film layer as a capacitive sensor circuit and a metal wire as a lead wire, which is made of glass or tempered glass. Or PET film; the bottom layer of the substrate is a capacitive touch screen protective layer, and the surface of the substrate is provided with a conductive film made of PET film. Each layer of the substrate is adhered together with a pressure sensitive adhesive (PSA) or an optical adhesive (OCA). The following is a description of the common structure and construction of prior art capacitive touch screens from a number of illustrations.

As shown in FIG. 1 and FIG. 1a, an example of a two-layer structure is shown in which the upper cover is a glass substrate 11 and the lower layer is a sensor glass 11' or a film substrate and a sensor film layer (ie, capacitive sensing). The sensor film formed by the conductive film layer of the device (the former example is selected as shown in FIG. 1) is combined, and the pressure sensitive adhesive 2 (PSA) is bonded in the middle.

As shown in FIG. 2 and FIG. 2a, an example of a three-layer structure is formed by combining an upper cover plate of a glass substrate 11 and two layers of sensor films, and optical bonding 3 (OCA) is used between the two. Hehe.

As shown in FIG. 3 and FIG. 3a, an example of a four-layer structure is formed by combining an upper cover of a glass substrate 11, a two-layer sensor film, and a protective film of a film substrate 12. Adhesive bonding is performed between the two using optical adhesive 3 (OCA).

In the prior art multilayer structure described above, the capacitive sensor circuit conductive film layer 4 is respectively integrated in the sensor glass 11' and the sensor film, and the capacitive touch screen is connected to the IC through the flexible circuit board 5. , but it has the following defects:

1) High material cost: the more layers, the more materials are consumed and the higher the cost; 2) the thickness of the finished product is thick, which cannot meet the design requirements of customers' ultra-thin models;

3) Complicated process route: It is necessary to go through multiple combined processes, and each additional process requires loss of labor and loss of yield.

In view of the above drawbacks of the prior art, the object of the present invention is to propose a novel capacitive touch screen structure, which opens up new ideas and feasible solutions for the application of the touch screen in the human-computer interaction device.

The object of the present invention is achieved by the following technical solutions: a capacitive touch screen structure, wherein the capacitive touch screen has one and only one substrate, and the substrate is sequentially integrated with the lower surface of the touch surface thereof. a capacitive sensor circuit conductive film layer, a silk screen decorative pattern layer and a lead wire layer, the lead wire layer passing through the silk screen decorative pattern layer and communicating with the capacitive sensor circuit conductive film layer, and passing through the flexible circuit board Connected to the IC.

The substrate is glass, plexiglass or tempered glass.

The conductive sensor circuit of the capacitive sensor circuit is one or more layers of a transparent conductive metal thin film coated or coated.

The invention discloses the creation and implementation of the touch screen of the single-layer substrate structure, and the outstanding effect thereof is that the amount of the substrate and the pressure sensitive adhesive can be greatly saved, the production process is reduced, the production cost of the product is effectively saved, and the current capacitive touch screen is promoted. The industry is more in line with the current requirements of low carbon and environmental protection; at the same time, the thickness of the product is thinner, which is more convenient to meet the ultra-thin design requirements of human-computer interaction models.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

In view of the fact that the existing capacitive touch screen generally adopts a multi-layer structure of two or more layers, the production process of the product is complicated, the finished product is thick, and it is not suitable for the ultra-thin design of human-computer interaction equipment. After many years of research on the structural characteristics of capacitive touch screens, the researcher of the present invention has proposed a capacitive touch screen with a single-layer structure, which has opened up new ideas and feasible solutions for the application of touch screens in human-computer interaction devices.

In order to achieve the above object, the technical solution of the present invention is mainly shown in FIG. 4 and FIG. 4a: it is different from the conventional conventional capacitive touch screen in that it has one and only one substrate, and the substrate faces away from it. The lower surface of the touch surface is sequentially integrated with a capacitive sensor circuit conductive film layer 4, a silk screen decorative pattern layer 6 and a lead wire layer 7, and the lead wire layer 7 passes through the silk screen decorative pattern layer 6 and the capacitive sensor circuit. The conductive film layer 4 is in communication and is connected to the IC through the flexible circuit board 5. As an optional optimization of the technical solution, the substrate may be a glass substrate 11, or an organic glass, or a tempered glass, etc., and the capacitive sensor circuit conductive film layer 4 may be a single layer coating layer or a coating film. The layer may also be a multi-layer coating layer or a coating layer, and the coating layer or the coating layer may be variously processed. For example, vacuum coating, evaporation, printing coating, deposition method; the material may be aluminum, cadmium, nickel, indium tin oxide, silver paste, carbon and other conductive materials.

From a simple point of view of the process: the capacitive touch screen is processed on the glass substrate 11 to process the conductive film layer 4 of the capacitive sensor circuit, and then the silk screen decorative pattern layer 6 is processed on the conductive film layer as The protective film layer is protected, and then the lead layer 7 is printed, and the lead wire layer 7 is connected to the capacitive sensor circuit conductive film layer 4. Finally, the lead wire layer 7 is connected to the IC through the flexible circuit board 5. In this way, the finished product of the single-layer capacitive touch screen is realized. This process description is intended to illustrate the layering sequence of the single-layer capacitive touch screen of the present invention, and does not unfold its specific process. However, on the basis of the prior art, the researchers have successfully produced successful samples through practice and obtained better test results.

The touch screen of the single-layer substrate structure of the invention is created and implemented, and the structural design integrating the appearance and the function has the following advantages.

1) Material cost is greatly reduced: at least 60% of raw material usage can be reduced. Taking a two-layer structure as an example, a layer of substrate and a pressure sensitive adhesive or optical glue are saved.

2) Thinning: It can be reduced by at least 0.15mm or more. For example, a two-layer structure (the sensor part is made of a single-layer PET film substrate), a PET film with a thickness of at least 0.125mm and an optical adhesive of at least 0.025mm, at least Reduce by 0.15mm.

3) Reduction of production process: The traditional capacitive touch screen is processed separately for each layer structure, and it needs to be combined in two or two after processing. The new invention is only required to be processed on a single layer substrate, and no combined process is required.

The capacitive touch screen structure of the single-layer structure of the present invention is comprehensively promoted, and the current capacitive touch screen industry is more in line with the current requirements of low-carbon environmental protection; at the same time, the thickness of the product is thinner, and it is more convenient to meet the ultra-thin design requirements of human-computer interaction models. .

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents of the present invention and the equivalents of the drawings are all included in the present invention. Within the scope of protection, it is given to Chen Ming.

11. . . Glass substrate

11’. . . Sensor glass

12. . . Film substrate

2. . . Pressure sensitive adhesive

3. . . Optical glue

4. . . Capacitive sensor circuit conductive film

5. . . Flexible circuit board

6. . . Silk screen decorative pattern layer

7. . . Lead line layer

1 is a schematic structural view of a touch screen in the prior art.

Figure 1a is an enlarged schematic view of the sensor portion of Figure 1.

2 is a schematic structural view of another touch screen in the prior art.

Figure 2a is an enlarged schematic view of the sensor portion of Figure 2.

FIG. 3 is a schematic structural diagram of another touch screen in the prior art.

Figure 3a is an enlarged schematic view of the sensor portion of Figure 3.

4 is a schematic structural view of a single layer touch screen of the present invention.

Figure 4a is an enlarged schematic view of the sensor portion of Figure 4.

11. . . Glass substrate

4. . . Capacitive sensor circuit conductive film

6. . . Silk screen decorative pattern layer

7. . . Lead line layer

Claims (3)

A capacitive touch screen structure is characterized in that: the capacitive touch screen has one and only one substrate, and the lower surface of the substrate facing away from the touch surface thereof is sequentially provided with a capacitive sensor circuit conductive film layer and silk screen decoration a pattern layer and a lead layer, the lead line layer passing through the silk screen decorative pattern layer and communicating with the capacitive sensor circuit conductive film layer, and connected to the IC through the flexible circuit board. The capacitive touch screen structure according to claim 1, wherein the substrate is glass, plexiglass or tempered glass. The capacitive touch screen structure according to claim 1, wherein the conductive sensor circuit of the capacitive sensor circuit is one or more layers of a transparent conductive metal film layer coated or coated.