Capacitive touch screen

Abstract

The utility model discloses a capacitive touch screen which comprises a substrate, an electrode layer, an isolating layer and a metal layer, the electrode layer, the isolating layer and the metal layer are respectively arranged on one side face of the substrate, and the isolating layer is located between the electrode layer and the metal layer. The metal layer comprises metal bridge points and metal wires, the metal bridge points and the metal wires are respectively connected with the electrode layer, and the metal wires are arranged around the periphery of the electrode layer. According to the capacitive touch screen, the substrate, the electrode layer, the isolation layer and the metal layer are arranged, and the metal layer is divided into the metal bridge points and the metal wires, so that the bridging mode that ITO is adopted as the bridge points in a traditional touch screen is canceled, and the etching process of one layer of ITO can be canceled; therefore, machining procedures are reduced, and production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of touch sensing, in particular to a capacitive touch screen. Background Art

[0002] With the development of science and technology, touch screens have become an indispensable part of our daily life and work. Therefore, the production volume of touch screens is also increasing, and there are higher requirements for the improvement of output and production capacity, which has also promoted the vigorous development of this industry. The rapid development of the capacitive touch screen industry has also accelerated the replacement of products, and it is necessary to develop more high-quality and beautiful products with low prices to improve competitiveness. However, the existing touch screen stacking structure is complex and has many processes. For example, in the production process, two layers of ITO (indium tin oxide) layers are usually required in the touch sensing structure, including an ITO pattern layer and an ITO bridge point, so the ITO processing process has two times, which will increase the production process and production time. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a capacitive touch screen which can reduce production processes and thus improve production efficiency.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A capacitive touch screen comprises: a substrate, an electrode layer, an isolation layer and a metal layer, wherein the electrode layer, the isolation layer and the metal layer are respectively arranged on one side surface of the substrate, and the isolation layer is located between the electrode layer and the metal layer; the metal layer comprises metal bridge points and metal routing lines, the metal bridge points and the metal routing lines are respectively connected to the electrode layer, and the metal routing lines are arranged around the four peripheries of the electrode layer.

[0006] In one embodiment, the substrate, the electrode layer, the isolation layer and the metal layer are stacked in sequence from bottom to top.

[0007] In one embodiment, the substrate, the metal layer, the isolation layer and the electrode layer are stacked in sequence from bottom to top.

[0008] In one of the embodiments, it further includes a cover plate and an optical adhesive layer, wherein the optical adhesive layer is located between the cover plate and the substrate, and the optical adhesive layer is used to connect the cover plate and the substrate.

[0009] In one embodiment, the optical adhesive layer is one of OCR optical adhesive and OCA optical adhesive.

[0010] In one embodiment, the cover plate is glass or a composite plate.

[0011] In one embodiment, the substrate is a glass substrate.

[0012] In one embodiment, the electrode layer is an ITO electrode layer.

[0013] In one embodiment, the isolation layer is an OC isolation layer.

[0014] In one embodiment, the metal bridge point and the metal trace are made of molybdenum metal.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] The capacitive touch screen of the utility model is provided with a substrate, an electrode layer, an isolation layer and a metal layer, and the metal layer is divided into a metal bridge point and a metal routing line, thereby eliminating the bridging method of the traditional touch screen using ITO as a bridge point, so that one layer of the ITO etching process can be eliminated; thereby reducing the processing steps and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0018] Figure 1 It is a structural schematic diagram of a capacitive touch screen in the first embodiment of the utility model;

[0019] Figure 2 It is a schematic structural diagram of a capacitive touch screen in a second embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of the connection structure between the electrode layer, the metal bridge point and the isolation layer of the capacitive touch screen in one embodiment of the utility model;

[0021] Figure 4 for Figure 3 A local enlarged structural diagram of the part;

[0022] Figure 5 It is a schematic diagram of the stacking structure of the substrate, the electrode layer and the metal wiring in the capacitive touch screen in the first embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the stacking structure of the substrate, metal wiring and electrode layer of the capacitive touch screen in the second embodiment of the utility model;

[0024] Figure 7 It is a schematic diagram of the stacking structure of the substrate, metal wiring and isolation layer of the capacitive touch screen in the second embodiment of the utility model; DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0026] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a capacitive touch screen 10 includes: a substrate 100, an electrode layer 200, an isolation layer 300 and a metal layer 400, wherein the electrode layer 200, the isolation layer 300 and the metal layer 400 are respectively arranged on one side of the substrate 100, and the isolation layer 300 is located between the electrode layer 200 and the metal layer 400; the metal layer 400 includes a metal bridge point 410 and a metal trace 420, the metal bridge point 410 and the metal trace 420 are respectively connected to the electrode layer 200, and the metal trace 420 is arranged around the four sides of the electrode layer 200.

[0027] It should be noted that by dividing the metal layer into metal bridge points and metal routings, the bridging method of using ITO as a bridge point in the traditional touch screen is eliminated. In this way, one layer of the ITO etching process can be eliminated, thereby reducing the processing steps and improving production efficiency.

[0028] See also Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in the first embodiment, the stacking order of the capacitive touch screen 10 is: the substrate 100, the electrode layer 200, the isolation layer 300 and the metal layer 400 are stacked in sequence from bottom to top. That is, the electrode layer 200 is located on the first layer of the substrate 100, and the electrode layer 200 can be etched by a yellow light process. The metal bridge point 410 in the metal layer 400 is connected to the electrode layer 200, and the metal bridge point 410 is located in the display area of ​​the capacitive touch screen 10, and the two sensing channels or two driving channels on the electrode layer 200 are connected through the metal bridge point 410. At the same time, the metal bridge point 410 and the electrode layer 200 are separated by the isolation layer 300, so that the overlapping area of ​​the metal bridge point 410 and the electrode layer 200 does not contact, thereby avoiding the short circuit between the electrode layer 200 and the metal bridge point 300. At the same time, the isolation layer 300 is partially covered, so it can still ensure that the metal bridge point 300 can connect the sensing channel and the driving channel on the electrode. Preferably, the electrode layer is an ITO electrode layer. The ITO electrode layer is the ITO pattern layer, and the touch sensing function is realized through the ITO pattern layer, metal bridge points and metal wiring.

[0029] See also Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, in the second embodiment, the stacking order of the capacitive touch screen 10 is: the substrate 100, the metal layer 400, the isolation layer 300 and the electrode layer 200 are stacked in sequence from bottom to top. That is, the metal layer 400 is used as the first layer, followed by the isolation layer 300 and the electrode layer 200; the isolation layer 300 is partially located between the metal bridge point 410 and the electrode layer 200, and this part of the isolation layer 300 is used to separate the metal bridge point 410 and the electrode layer 200, so that the overlapping area of ​​the metal bridge point 410 and the electrode layer 200 does not contact, thereby avoiding the short circuit between the electrode layer 200 and the metal bridge point 300; in one embodiment, the electrode layer 200 can be used alone to cover the metal wiring 420, and the metal wiring 420 can be isolated by the electrode layer 200. When the wiring space is insufficient, the isolation layer 300 may be used to cover the metal wiring 420, and the isolation layer 300 may be used to isolate and protect the metal wiring 420, while the electrode layer 200 only needs to be partially connected to the metal wiring 420, and there is no need to fully cover the metal wiring 420; the metal wiring 420 may be isolated and protected by the electrode layer 200 or the isolation layer 300, so that the metal wiring 420 may be prevented from being scratched by foreign objects during the production process and affecting the touch sensing function; in this embodiment, the isolation layer 300 is OC (Over coating, an insulating resin material) isolation layer. Since the bridge structure of the traditional touch screen adopts ITO bridging, two OC layers are required accordingly. One OC layer is used to separate the electrode layer 200 and the metal bridge point 410, and the other OC layer is used to protect the metal wiring. However, in the present embodiment, the bridge structure adopts metal bridging, and the material of the metal bridge point is the same as that of the metal wiring. In this way, during production, the metal bridge point and the metal wiring are manufactured at the same time in the same process. At the same time, the metal wiring 420 can be isolated and protected by the electrode layer 200 or the isolation layer 300, and there is no need to set up a second OC layer to isolate and protect the metal wiring 420. In this way, a process of manufacturing the OC layer can be saved, that is, only three layers of touch function structure are needed to realize the multi-touch function that can only be realized by the existing five-layer touch function structure, thereby improving production efficiency, saving production costs, simplifying the process flow, and further improving the yield rate.

[0030] See also Figure 1 or Figure 2As shown, in one embodiment, the capacitive touch screen further includes a cover plate 500 and an optical adhesive layer 600, the optical adhesive layer 600 is located between the cover plate 500 and the substrate 100, and the optical adhesive layer 600 is used to connect the cover plate 500 and the substrate 100. The cover plate 500 is located at the outermost layer of the capacitive touch screen, and the internal structure of the capacitive touch screen is isolated and protected by the cover plate 500. In this embodiment, the optical adhesive layer 600 is one of OCR (Optical Clear Resin) optical glue or OCA (Optically Clear Adhesive) optical glue, both of which are special adhesives used in the optical field, and both of which have high light transmittance and good bonding ability, so they can ensure the bonding quality and display effect of the capacitive touch screen.

[0031] Preferably, the cover plate 500 is made of glass or a composite plate. Glass has high light transmittance, which can ensure the display effect of the capacitive touch screen; and the composite plate, compared with the glass material, can prevent glass fragments from splashing and injuring people when the touch screen is broken.

[0032] Preferably, the substrate is a glass substrate. The various layers of structures are formed on the glass substrate by yellow light process.

[0033] Preferably, the electrode layer is an ITO electrode layer, which is an ITO pattern layer, and the touch sensing function is realized through the ITO pattern layer, metal bridge points and metal wiring.

[0034] Preferably, the isolation layer is an OC isolation layer.

[0035] Preferably, the metal bridge points and metal traces are made of molybdenum metal.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A capacitive touch screen, characterized in that: include: A substrate, an electrode layer, an isolation layer and a metal layer, wherein the electrode layer, the isolation layer and the metal layer are respectively arranged on one side of the substrate, and the isolation layer is located between the electrode layer and the metal layer; The metal layer includes metal bridge points and metal routing lines, the metal bridge points and the metal routing lines are respectively connected to the electrode layer, and the metal routing lines are arranged around the four peripheries of the electrode layer.

2. The capacitive touch screen according to claim 1, characterized in that: The substrate, the electrode layer, the isolation layer and the metal layer are stacked in sequence from bottom to top.

3. The capacitive touch screen according to claim 1, characterized in that: The substrate, the metal layer, the isolation layer and the electrode layer are stacked in sequence from bottom to top.

4. The capacitive touch screen according to claim 2 or 3, characterized in that: It also includes a cover plate and an optical adhesive layer, wherein the optical adhesive layer is located between the cover plate and the substrate, and the optical adhesive layer is used to connect the cover plate and the substrate.

5. The capacitive touch screen according to claim 4, characterized in that: The optical adhesive layer is one of OCR optical adhesive and OCA optical adhesive.

6. The capacitive touch screen according to claim 4, characterized in that: The cover plate is glass or a composite plate.

7. The capacitive touch screen according to claim 1, characterized in that: The substrate is a glass substrate.

8. The capacitive touch screen according to claim 1, characterized in that: The electrode layer is an ITO electrode layer.

9. The capacitive touch screen according to claim 1, characterized in that: The isolation layer is an OC isolation layer.

10. The capacitive touch screen according to claim 1, characterized in that: The metal bridge points and the metal traces are made of molybdenum metal.

Images