CN212379821U

CN212379821U - High-reliability capacitive touch screen and electronic equipment

Info

Publication number: CN212379821U
Application number: CN202021031724.XU
Authority: CN
Inventors: 陈健立; 林汉良
Original assignee: Truly Opto Electronics Ltd
Current assignee: Truly Opto Electronics Ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-01-19
Anticipated expiration: 2030-06-08

Abstract

The utility model discloses a high reliability capacitive touch screen and electronic equipment, reliability capacitive touch screen includes: a substrate; the conductive pattern layer is arranged on the substrate; the metal wiring layer is positioned at the periphery of the conductive pattern layer and comprises a metal wiring arranged on the substrate and an ITO (indium tin oxide) protective layer arranged on the metal wiring, and the metal wiring is electrically connected with the conductive pattern layer; and the auxiliary protective layer covers the conductive pattern layer and the metal routing layer. Through the utility model discloses the scheme adopts the metal to walk the structure of line + ITO protective layer, when can satisfying anti high reliability requirement, satisfies the resistance requirement of passageway.

Description

High-reliability capacitive touch screen and electronic equipment

Technical Field

The utility model relates to a touch-control technical field especially relates to a high reliability capacitive touch screen and electronic equipment.

Background

The capacitive touch screen technology works by using current induction of a human body. With the continuous development of capacitive touch screens, the types of capacitive touch screens are also increasing, such as an OGS (One Glass Solution) touch screen, a G-G touch screen, and the like.

Taking an OGS touch screen as an example, the OGS touch screen is an electronic product protection screen in which an ITO (Indium Tin oxide) conductive film and a sensor are directly formed on a protection glass, and mainly a piece of glass plays dual roles of protecting the glass and touching the sensor at the same time. Compared with a G-G touch screen, the OGS touch screen has the advantages of lower price, simpler process flow and better control over timely delivery of products, so that the OGS touch screen gradually replaces the G-G touch screen and is widely applied to vehicle-mounted TP (touchscreens), electronic products and the like.

However, in the conventional OGS touch screen, the protective layer of the metal trace is OC glue, the OC glue has insufficient requirement on high reliability, and when the OGS touch screen is continuously placed for more than one thousand hours in an environment with a temperature of 60 ℃ and a humidity of 90%, the OC glue metal trace of the OGS touch screen is easily corroded.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a high reliability capacitive touch screen for among the solution prior art, capacitive touch screen's metal is walked the line and is corroded the problem easily.

In order to solve the above problem, the utility model adopts the following technical scheme:

provided is a high-reliability capacitive touch screen including:

a substrate;

the conductive pattern layer is arranged on the substrate;

the metal wiring layer is positioned at the periphery of the conductive pattern layer and comprises a metal wiring arranged on the substrate and an ITO (indium tin oxide) protective layer arranged on the metal wiring, and the metal wiring is electrically connected with the conductive pattern layer;

and the auxiliary protective layer covers the conductive pattern layer and the metal routing layer.

Optionally, the metal routing layer further includes an ITO substrate disposed between the substrate and the metal routing.

Optionally, the ITO substrate and the ITO protection layer located in the gap of the metal trace are at least partially etched.

Optionally, the width of the ITO substrate at the overlapping portion with each metal trace is greater than the width of the metal trace.

Optionally, the width of the ITO protection layer at the overlapping portion with each metal trace is equal to the width of the metal trace.

Optionally, the conductive pattern layer includes a first ITO conductive layer, an insulating layer, and a second ITO conductive layer, which are sequentially stacked, and the first ITO conductive layer is disposed on the substrate.

Optionally, ink is coated between the ITO substrate and the substrate.

Optionally, the conductive pattern layer includes an ITO conductive layer disposed on the substrate and an MAM bridge bridging the ITO conductive layer.

Optionally, the auxiliary protective layer is OC glue.

An electronic device is also provided, which comprises the high-reliability capacitive touch screen.

The utility model discloses a technical scheme can reach following beneficial effect:

the ITO protective layer is plated on the back of the metal wiring, ITO is an oxide, the anti-oxidation capability is stronger than that of the metal wiring, therefore, the ITO with high reliability resistance is plated on the back of the metal wiring, the higher product requirement can be met, but the resistance of the ITO is high, the surface resistance of the ITO can reach 30-80 ohms, the surface resistance of the metal wiring is only 0.3 +/-0.1 ohms, the resistance requirement of the channel can be met only by adopting the metal wiring for long wiring, therefore, the structure of the metal wiring and the ITO protective layer is adopted, the resistance requirement of the channel can be met while the high reliability resistance requirement is met.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof of the present invention explain the present invention and do not form an improper limitation to the present invention. In the drawings:

fig. 1 is a schematic structural diagram of a capacitive touch screen disclosed in the prior art;

fig. 2 is a schematic side view of a capacitive touch screen according to an embodiment of the present invention;

fig. 3 is a schematic front structural view of a capacitive touch screen according to an embodiment of the present invention.

Wherein the following reference numerals are specifically included in figures 1-3:

a substrate-1; a metal routing layer-2; metal routing-2'; auxiliary protective layer-3, OC glue-3'; ink-4; a metal trace-21; an ITO protective layer-22; ITO substrate-23.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses a high reliability capacitive touch screen can be applied to electronic products such as on-vehicle TP. As shown in fig. 2 and 3, the high-reliability capacitive touch screen includes a substrate 1, a conductive pattern layer, a metal wiring layer 2, and an auxiliary protective layer 3. The substrate 1 may be a glass substrate 1 provided with a window area and a non-window area located at the periphery of the window area. The conductive pattern layer may be provided in the window area of the substrate 1. The metal wiring layer 2 is disposed in the non-window area of the substrate 1, is located at the periphery of the conductive pattern layer, and includes a metal wiring 21 disposed on the substrate 1 and an ITO (Indium Tin oxide) protective layer 22 disposed on the metal wiring 21, the metal wiring 21 is electrically connected to the conductive pattern layer to electrically connect the conductive pattern layer to an electronic device, such as an FPC, and the metal wiring 21 may be made of MoAlMo (molybdenum aluminum molybdenum, MAM for short). Auxiliary protective layer 3 covers conductive pattern layer and metal routing layer 2, and auxiliary protection conductive pattern layer and metal routing layer 2 reduce by the corrosion risk, and auxiliary protective layer 3 can be OC glues, reduces the change to current process, reduce cost.

In the existing capacitive touch screen, as shown in fig. 1, a metal trace 2 ' is only covered by OC glue 3 ', but hardness and compactness of the OC glue 3 ' are not very high, and in a project with a high reliability requirement, the metal trace 21 is corroded, so that the reliability is not satisfied. For current capacitive touch screen, the utility model discloses a capacitive touch screen, it has the ITO protective layer 22 to plate at the metal wiring 21 back (the one side of base plate 1 dorsad), ITO itself is the oxide, the oxidation resistance is stronger than the metal wiring 21, consequently, the ITO of the anti high reliability of one deck is plated at the metal wiring 21 back, can satisfy higher product demand, but ITO's resistance is high, its surface resistance can reach 30-80 ohm, and the surface resistance of metal wiring 21 only has 0.3 +/-0.1 ohm, long line of walking adopts the metal to walk the resistance requirement that line 21 could satisfy the passageway, consequently, adopt the metal to walk the structure of line 21+ ITO protective layer 22, when can satisfying anti high reliability requirement, satisfy the resistance requirement of passageway.

Further, metal routing layer 2 further includes ITO substrate 23 disposed between substrate 1 and metal routing 21, and ITO substrate 23 protects metal routing 21, thereby further reducing the risk of corrosion of metal routing 21.

It should be noted that at least a portion of the ITO substrate 23 and the ITO protection layer 22 located in the gap between the metal traces 21 is etched away, that is, each metal trace 21 is a separate metal trace 21, so as to prevent each metal trace 21 from being conducted by the ITO substrate 23 and the ITO protection layer 22. The width of the overlapping portion of the ITO substrate 23 and each metal trace 21 may be greater than the width of the metal trace 21, the width of the ITO substrate 23 protruding from each side of the metal trace 21 may be approximately 10 μm, and the width of the overlapping portion of the ITO protective layer 22 and each metal trace 21 may be equal to the width of the metal trace 21. With such an arrangement, the alignment tolerance of the mask used in exposing the ITO protection layer 22 is taken into consideration, so as to reduce the risk of etching the metal trace 21 when the ITO protection layer 22 is etched.

The conductive pattern layer comprises a first ITO conductive layer arranged on the substrate 1, an insulating layer arranged on the first ITO conductive layer and a second ITO conductive layer arranged on the insulating layer, the first ITO conductive layer and the second ITO conductive layer are crossed bar-shaped hollow patterns, and a plurality of touch induction points are formed by the first ITO conductive layer and the second ITO conductive layer.

Ink 4 (BM for short) is coated on the back surface of the substrate 1 in the non-window area (i.e. between the metal trace 21 and the substrate 1). The metal traces 21 are shielded by the ink 4 to prevent the metal traces 21 from being seen from the front of the touch screen.

At this time, the processing sequence of the capacitive touch screen is adjusted from the existing first ITO conductive layer plating, second ITO conductive layer plating, and metal wiring 21 plating to the first ITO conductive layer plating and ITO substrate 23 plating, metal wiring 21 plating, second ITO conductive layer plating, and ITO protection layer 22 plating. Therefore, the scheme does not increase the cost, and only needs to adjust the production and processing sequence.

When the metal wiring layer 2 does not include the ITO substrate 23, but only includes the metal wiring 21 and the ITO protective layer 22, the conductive pattern layer includes an ITO conductive layer provided on the substrate 1 and an MAM (MoAlMo, molybdenum aluminum molybdenum) bridge bridging the ITO conductive layer. The pattern shape of the ITO conductive layer can be a triangular structure, a flexible structure or a rectangular structure. The conductive pattern layer is stable in structure and convenient for batch production.

The processing sequence of the capacitive touch screen is adjusted from the prior ITO plating conducting layer, MAM plating bridging and metal plating routing 21 to metal plating routing 21, ITO plating conducting layer and ITO protective layer 22 and MAM plating bridging. Therefore, the scheme does not increase the cost, and only needs to adjust the production and processing sequence.

The electronic equipment comprises the high-reliability capacitive touch screen. In this electronic equipment, the ITO protective layer 22 has been plated at the metal wiring 21 back (the one side of base plate 1 dorsad), ITO itself is the oxide, the oxidation resistance is stronger than metal wiring 21, consequently, the ITO of the anti high reliability of one deck is plated at metal wiring 21 back, can satisfy higher product demand, but ITO's resistance is high, its sheet resistance can reach 30-80 ohm, and metal wiring 21's sheet resistance only 0.3 +/-0.1 ohm, long line adopts metal wiring 21 can satisfy the resistance requirement of passageway, consequently, adopt the structure of metal wiring 21+ ITO protective layer 22, when can satisfy anti high reliability requirement, satisfy the resistance requirement of passageway.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.

Claims

1. A high reliability capacitive touch screen, comprising:

a substrate;

the conductive pattern layer is arranged on the substrate;

2. The high reliability capacitive touch screen of claim 1, wherein the metal trace layer further comprises an ITO substrate disposed between the substrate and the metal traces.

3. The high reliability capacitive touch screen of claim 2, wherein the ITO substrate and the ITO protection layer located in the gap of the metal traces are at least partially etched.

4. The high-reliability capacitive touch screen according to claim 3, wherein the width of the ITO substrate at the overlapping portion with each metal trace is greater than the width of the metal trace.

5. The high-reliability capacitive touch screen according to claim 3, wherein the width of the ITO protective layer at the overlapping portion with each metal trace is equal to the width of the metal trace.

6. The high-reliability capacitive touch screen according to any one of claims 2 to 5, wherein the conductive pattern layer comprises a first ITO conductive layer, an insulating layer and a second ITO conductive layer stacked in this order, and the first ITO conductive layer is provided on the substrate.

7. The high reliability capacitive touch screen of claim 6, wherein the ITO substrate and the substrate are inked therebetween.

8. The high reliability capacitive touch screen of claim 1, wherein the conductive pattern layer comprises an ITO conductive layer disposed on the substrate and a MAM bridge bridging the ITO conductive layer.

9. The high reliability capacitive touch screen of any of claims 1-5, wherein the auxiliary protective layer is OC glue.

10. An electronic device characterized by comprising the high-reliability capacitive touch screen according to any one of claims 1 to 9.