Film structure of touch screen dry etching silver paste

Abstract

The utility model discloses a touch screen dry etching silver paste film structure which comprises a first insulation protection layer, a first dry etching silver paste wiring layer, a first film layer, a first optical cement layer, a second insulation protection layer, a second dry etching silver paste wiring layer and a second film layer which are sequentially stacked, and the first insulation protection layer covers the first dry etching silver paste wiring layer. The second insulation protection layer covers the second dry etching silver paste wiring layer. Thus, the first dry-etching silver paste wiring layer is protected through the first insulation protection layer, and the second dry-etching silver paste wiring layer is protected through the second insulation protection layer, so that migration of silver ions can be avoided, short circuit of two adjacent channels on the silver paste wiring layer is avoided, and the service life of a product is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of touch screens, in particular to a film structure of dry-engraved silver paste for touch screens. Background Art

[0002] In the touch screen industry, there are three ways to make silver paste wiring: silk screen silver paste, exposure silver paste, and dry-engraving silver paste. Compared with the other two processes, dry-engraving silver paste has low production cost and can achieve very small line width and line spacing, so it can achieve narrow frame technology, so it is widely used in wearable products. However, the biggest problem with dry-engraving silver paste at present is that dry-engraving dust will remain on the dry-engraving circuit. The so-called dry-engraving dust refers to silver paste dust. Silver paste dust contains silver ions. In long-term use or in a humid environment, it may cause silver ion migration, and eventually cause a short circuit between two adjacent channels of the silver paste wiring, which in turn causes product failure. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide a film structure of dry-etched silver paste for a touch screen which can prevent the migration of silver ions.

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

[0005] A film structure of dry-etched silver paste for a touch screen comprises: a first insulating protective layer, a first dry-etched silver paste routing layer, a first film layer, a first optical adhesive layer, a second insulating protective layer, a second dry-etched silver paste routing layer and a second film layer, wherein the first insulating protective layer, the first dry-etched silver paste routing layer, the first film layer, the first optical adhesive layer, the second insulating protective layer, the second dry-etched silver paste routing layer and the second film layer are stacked in sequence from top to bottom, and the first insulating protective layer covers the first dry-etched silver paste routing layer, and the second insulating protective layer covers the second dry-etched silver paste routing layer.

[0006] In one embodiment, the first insulating protective layer is insulating oil.

[0007] In one embodiment, the thickness of the first insulating protection layer is 4-6 μm.

[0008] In one embodiment, the second insulating protective layer is insulating oil.

[0009] In one embodiment, the thickness of the second insulating protection layer is 4-6 μm.

[0010] In one embodiment, the first optical adhesive layer is an OCA optical adhesive layer.

[0011] In one embodiment, the thickness of the first optical adhesive layer is 0.25 mm.

[0012] In one of the embodiments, a second optical adhesive layer is further included, and the second optical adhesive layer is disposed on a side of the first insulating protection layer away from the first dry-etched silver paste wiring layer.

[0013] In one embodiment, the second optical adhesive layer is an OCA optical adhesive layer.

[0014] In one embodiment, the thickness of the second optical adhesive layer is 0.25 mm.

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

[0016] The film structure of the dry-engraved silver paste for the touch screen of the utility model is provided with a first insulating protective layer, a first dry-engraved silver paste wiring layer, a first film layer, a first optical adhesive layer, a second insulating protective layer, a second dry-engraved silver paste wiring layer and a second film layer, so that the first dry-engraved silver paste wiring layer can be protected by the first insulating protective layer, and the second dry-engraved silver paste wiring layer can be protected by the second insulating protective layer, so as to avoid the migration of silver ions and further avoid the short circuit between two adjacent channels on the silver paste wiring layer, so as to improve the service life of the product. 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 schematic diagram of the stacking structure of the film structure of the dry-etching silver paste for the touch screen in one embodiment of the utility model;

[0019] Figure 2 It is a front view structural schematic diagram of a film structure of a touch screen dry-etching silver paste in one embodiment of the utility model;

[0020] Figure 3 for Figure 1 A schematic diagram of the structure of the first film layer and the first dry-etched silver paste wiring layer of the film structure of the touch screen dry-etched silver paste;

[0021] Figure 4 It is a structural schematic diagram of a second film layer and a second dry-etching silver paste wiring layer of a film structure of dry-etching silver paste for a touch screen in one embodiment of the utility model. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1, Figure 2 , Figure 3 and Figure 4 As shown, a film structure 10 of dry-etched silver paste for a touch screen includes: a first insulating protective layer 100, a first dry-etched silver paste routing layer 200, a first film layer 300, a first optical adhesive layer 400, a second insulating protective layer 500, a second dry-etched silver paste routing layer 600 and a second film layer 700. The first insulating protective layer 100, the first dry-etched silver paste routing layer 200, the first film layer 300, the first optical adhesive layer 400, the second insulating protective layer 500, the second dry-etched silver paste routing layer 600 and the second film layer 300 are stacked in sequence from top to bottom, and the first insulating protective layer 500 covers the first dry-etched silver paste routing layer 200, and the second insulating protective layer 500 covers the second dry-etched silver paste routing layer 200.

[0024] It should be noted that, during the manufacturing process, the first dry-engraved silver paste routing layer 200 is first formed by dry-engraving on the first film layer 300, and then the first insulating protective layer 100 is covered on the first dry-engraved silver paste routing layer 200. The first insulating protective layer 100 is used to isolate and protect the first dry-engraved silver paste routing layer 200, thereby preventing the migration of silver paste ions. It should also be noted that a binding position is provided on the first dry-engraved silver paste routing layer 200, and the binding position needs to be bound to the flexible circuit board, so the first insulating protective layer 100 needs to avoid the binding position. Similarly, a second dry-engraved silver paste routing layer 600 is formed by dry-engraving on one side of the second film layer 300, and a second insulating protective layer 500 is covered on the second dry-engraved silver paste routing layer 600. The second insulating protective layer 500 is used to isolate and protect the second dry-engraved silver paste routing layer 600, thereby avoiding the migration of silver ions during long-term use or in a humid state, thereby avoiding short circuits, and then increasing the service life of the product.

[0025] Preferably, the first insulating protective layer 100 is insulating oil. The insulating oil can be screen-printed through a polyester screen to cover the first dry-engraved silver paste wiring layer 200. The curing temperature of the insulating oil is 150 degrees Celsius and the curing time is 10 minutes. Preferably, the thickness of the first insulating protective layer is 4-6 μm, so that the thickness of the overall structure is not affected. In addition, the insulating oil can also be UV insulating oil.

[0026] Preferably, the second insulating protective layer 500 is insulating oil. Similarly, the processing technology of the second insulating protective layer 500 is the same as that of the first insulating protective layer 100. Preferably, the thickness of the second insulating protective layer 500 is 4-6 μm.

[0027] Preferably, the first optical adhesive layer 400 is an OCA optical adhesive layer. OCA optical adhesive layer is a special adhesive used to bond optical elements. It has the advantages of high light transmittance and high bonding strength, so it can ensure bonding stability without affecting the display effect of the product. Preferably, the thickness of the first optical adhesive layer 400 is 0.25 mm.

[0028] Furthermore, the film structure of the touch screen dry-engraved silver paste also includes a second optical adhesive layer 800, which is arranged on a side of the first insulating protective layer 100 away from the first dry-engraved silver paste wiring layer 200. The second optical adhesive layer 800 enables the film structure to be bonded and connected with other components. Preferably, the second optical adhesive layer is an OCA optical adhesive layer. Preferably, the thickness of the second optical adhesive layer 800 is 0.25 mm.

[0029] 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 film structure for dry-engraving silver paste for a touch screen, characterized in that: include: A first insulating protective layer, a first dry-engraved silver paste routing layer, a first film layer, a first optical adhesive layer, a second insulating protective layer, a second dry-engraved silver paste routing layer and a second film layer. The first insulating protective layer, the first dry-engraved silver paste routing layer, the first film layer, the first optical adhesive layer, the second insulating protective layer, the second dry-engraved silver paste routing layer and the second film layer are stacked in sequence from top to bottom, and the first insulating protective layer covers the first dry-engraved silver paste routing layer, and the second insulating protective layer covers the second dry-engraved silver paste routing layer.

2. The film structure of the touch screen dry-engraving silver paste according to claim 1, characterized in that: The first insulating protective layer is insulating oil.

3. The film structure of the touch screen dry-engraving silver paste according to claim 2, characterized in that: The thickness of the first insulating protection layer is 4-6 μm.

4. The film structure of the touch screen dry-engraving silver paste according to claim 1, characterized in that: The second insulating protective layer is insulating oil.

5. The film structure of the touch screen dry-engraving silver paste according to claim 4, characterized in that: The thickness of the second insulating protection layer is 4-6 μm.

6. The film structure of the touch screen dry-engraving silver paste according to claim 1, characterized in that: The first optical adhesive layer is an OCA optical adhesive layer.

7. The film structure of the touch screen dry-engraving silver paste according to claim 6, characterized in that: The thickness of the first optical adhesive layer is 0.25 mm.

8. The film structure of the touch screen dry-engraving silver paste according to claim 1, characterized in that: It also includes a second optical adhesive layer, which is arranged on a side of the first insulating protection layer away from the first dry-etched silver paste wiring layer.

9. The film structure of the touch screen dry-engraving silver paste according to claim 8, characterized in that: The second optical adhesive layer is an OCA optical adhesive layer.

10. The film structure of the touch screen dry-engraving silver paste according to claim 9, characterized in that: The thickness of the second optical adhesive layer is 0.25 mm.

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