CN215895429U

CN215895429U - Touch screen

Info

Publication number: CN215895429U
Application number: CN202122324728.8U
Authority: CN
Inventors: 徐洪滨
Original assignee: Wannian Lianchuang Display Technology Co ltd
Current assignee: Wannian Lianchuang Display Technology Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-02-22
Anticipated expiration: 2031-09-24

Abstract

The utility model belongs to the technical field of touch screens, and particularly relates to a touch screen which comprises a functional sheet, an FPC board and a cover board; the functional sheet comprises a touch sensing layer and an adhesive layer, and the cover plate is bonded with the functional sheet through the adhesive layer; the functional sheet is provided with a through hole for exposing the silver finger, part of the FPC board is arranged in the through hole and is in compression joint with the silver finger to form a binding area, one surface of the binding area, which is far away from the cover plate, is provided with an anti-oxidation layer for covering the metal exposed part of the binding area, one surface of the binding area, which faces the cover plate, is provided with a sealing layer, and the binding area is hermetically bonded with the cover plate through the sealing layer. According to the utility model, by arranging the bonding layer, the sealing layer and the anti-oxidation layer, the functional sheet and the cover plate are completely attached together, and the binding area is sealed and subjected to anti-oxidation treatment, so that the corrosion of salt mist and water vapor is avoided.

Description

Touch screen

Technical Field

The utility model belongs to the technical field of touch screens, and particularly relates to a touch screen.

Background

The traditional touch screen comprises cover glass, a Flexible Printed Circuit (FPC) board and a touch sensing film. The FPC board of the flexible circuit board and the touch sensing film need to be pressed, bound and electrically connected, and exposed metal pins are also arranged at the connection position of the flexible circuit board. Therefore, the requirement for water vapor and salt mist corrosion prevention is high, and the salt mist and water vapor prevention treatment is usually performed by sealing glue in the binding region.

However, salt spray experiments and practical use show that the bonding position of the flexible circuit board and the functional sheet is most easily corroded to cause poor contact, and the poor contact cannot be completely avoided through a dispensing mode, and meanwhile, if the functional sheet and the cover plate are not completely sealed and have gaps, external moisture can easily enter the bonding position of the flexible circuit board and the touch sensing layer, so that the region is more easily corroded.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a touch screen, which aims to solve the problem that a binding area between an FPC board and a functional sheet in the existing touch screen is easily corroded by smoke.

The utility model provides the following technical proposal, a touch screen comprises a functional sheet, and a FPC board and a cover board which are respectively positioned at the two sides of the functional sheet; the functional sheet comprises a touch sensing layer and a bonding layer which are stacked, the touch sensing layer is arranged in the direction away from the cover plate, and the cover plate is bonded with the functional sheet through the bonding layer; the touch sensing layer comprises a plurality of touch sensing units and silver fingers arranged on the touch sensing units; a through hole is dug in the functional sheet to expose the silver finger, part of the FPC board is arranged in the through hole and is in compression joint with the silver finger to form a binding area, and an anti-oxidation layer is arranged on one surface, far away from the cover plate, of the binding area; and one surface of the binding region facing the cover plate is provided with a sealing layer, and the binding region is hermetically bonded with the cover plate through the sealing layer.

Compared with the prior art, the utility model has the beneficial effects that: through setting up tie coat, sealing layer, anti oxidation coating, the function piece with the apron is in the same place completely, and to binding the district and insulating, complete sealing treatment, having cut off steam, salt fog and have got into binding the district, avoided the corruption of salt fog, steam, improve the quality of product.

Preferably, the FPC board comprises an FPC body and a golden finger arranged on the FPC body, and the golden finger is connected with the silver finger on the touch sensing unit in a hot-pressing mode, so that the FPC board is connected with the functional sheet.

Preferably, the material of tie coat is OCA optical cement.

Preferably, the touch sensing layer is made of an ITO film.

Preferably, the thickness of the oxidation preventing layer is smaller than that of the bonding layer.

Preferably, the surface of the FPC is adhered with conductive adhesive for releasing static electricity.

Preferably, the material of the oxidation preventing layer is silicon dioxide.

Preferably, the sealing layer is made of a double-sided adhesive tape.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a front view of a touch screen provided by an embodiment of the present invention;

FIG. 2 is a rear view of a touch screen provided by an embodiment of the present invention;

fig. 3 is a schematic position diagram of a binding region in a touch screen according to an embodiment of the present invention;

description of reference numerals:

FPC board-1, function sheet-2, touch induction layer-21, adhesive layer-22, cover plate-3, anti-oxidation layer-4, sealing layer-5, binding area-6, silver finger-7;

reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the utility model.

In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In a first embodiment of the present invention, as shown in fig. 1-3, a touch screen includes a functional sheet 2, and an FPC board 1 and a cover board 3 respectively located at both sides of the functional sheet; the functional sheet 2 comprises a touch sensing layer 21 and an adhesive layer 22 which are laminated; the adhesive layer 22 is attached to the touch sensing layer 21, the adhesive layer 22 is arranged in a direction close to the cover plate 3, the touch sensing layer 21 is arranged in a direction far away from the cover plate 3, and the cover plate 3 is adhered to the functional sheet 2 through the adhesive layer 22; the touch sensing layer 21 comprises a plurality of touch sensing units and silver fingers 7, the silver fingers 7 are arranged on the touch sensing units, the FPC board 1 is arranged on one surface, far away from the cover plate 3, of the functional sheet 2, through holes are formed in the functional sheet 2 to expose the silver fingers 7, part of the FPC board 1 is arranged in the through holes and is in compression joint with the silver fingers 7 to form a binding area 6, an anti-oxidation layer 4 is arranged on one surface, far away from the cover plate 3, of the binding area 6, the anti-oxidation layer 4 is used for covering the metal exposed part of the binding area 6, a sealing layer 5 is arranged on one surface, facing the cover plate 3, of the binding area 6, and the binding area 6 is hermetically bonded with the cover plate 3 through the sealing layer 5. Compared with the prior art, the utility model has the beneficial effects that: by arranging the bonding layer 22, the sealing layer 5 and the anti-oxidation layer 4, the functional sheet 2 and the cover plate 3 are completely attached together, and the binding area 6 is insulated and completely sealed, so that water vapor and salt mist are prevented from entering the binding area, the corrosion of the salt mist and the water vapor is avoided, and the product quality is improved.

Preferably, the FPC board 1 includes an FPC board body and a gold finger, the gold finger is provided on the FPC board body, and the gold finger (covered by the oxidation-resistant layer 4, not shown) is connected to the silver finger 7 on the touch sensing unit by hot pressing so that the FPC board 1 and the functional sheet 2 are bonded together by hot pressing.

Preferably, the material of the bonding layer 22 is OCA optical adhesive, which is one of the raw materials of an important touch screen, and the OCA optical adhesive is made into a non-substrate material, and then a layer of release film is respectively attached to the upper and lower bottom layers, so that the double-sided adhesive tape is a non-substrate material. It is the best adhesive for touch screens. Its advantages are high clearness, high optical transparency (99% of total light transmittance), high adhesion, high weatherability, water resistance, high resistance to high temp and ultraviolet, controlled thickness, uniform spacing, and no yellowing, peeling and deterioration.

Preferably, the touch sensing layer 21 is made of an ITO film, which is an n-type semiconductor material and has high electrical conductivity, high visible light transmittance, high mechanical hardness, and good chemical stability. It is the most commonly used thin film material for transparent electrodes of Liquid Crystal Displays (LCDs), Plasma Displays (PDPs), electroluminescent displays (EL/OLEDs), touch screens, solar cells, and other electronic instruments.

Preferably, the thickness of the oxidation-resistant layer 4 is smaller than that of the adhesive layer 22, so as to prevent the FPC board 1 and the functional sheet 2 from foaming due to protrusion when the surfaces away from the cover plate 3 are attached to a display module (not shown).

Preferably, a conductive adhesive is attached to the surface of the FPC board 1, and the conductive adhesive is an adhesive having a certain conductivity after being cured or dried. It can connect multiple conductive materials together to form an electrical path between the connected materials. The adhesive with certain conductivity after the conductive adhesive is cured or dried can connect a plurality of conductive materials together, so that an electric path is formed between the connected materials.

Preferably, the material of the oxidation preventing layer 4 is silicon dioxide.

Preferably, the sealing layer 5 is made of a double-sided adhesive tape.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A touch screen is characterized by comprising a functional sheet, and FPC boards and cover boards which are respectively positioned at two sides of the functional sheet; the functional sheet comprises a touch sensing layer and a bonding layer which are stacked, the touch sensing layer is arranged in the direction away from the cover plate, and the cover plate is bonded with the functional sheet through the bonding layer; the touch sensing layer comprises a plurality of touch sensing units and silver fingers arranged on the touch sensing units; a through hole is dug in the functional sheet to expose the silver finger, part of the FPC board is arranged in the through hole and is in compression joint with the silver finger to form a binding area, and an anti-oxidation layer is arranged on one surface, far away from the cover plate, of the binding area; and one surface of the binding region facing the cover plate is provided with a sealing layer, and the binding region is hermetically bonded with the cover plate through the sealing layer.

2. The touch screen of claim 1, wherein the FPC board comprises an FPC body and a gold finger arranged on the FPC body, and the gold finger is connected with the silver finger on the touch sensing unit in a hot-pressing manner, so that the FPC board is connected with the functional sheet.

3. The touch screen of claim 1, wherein the adhesive layer is made of OCA optical cement.

4. The touch screen of claim 1, wherein the touch sensitive layer is made of an ITO film.

5. The touch panel of claim 1, wherein the oxidation protection layer has a thickness less than a thickness of the adhesive layer.

6. The touch screen of claim 1, wherein a conductive adhesive is attached to the surface of the FPC board for releasing static electricity.

7. The touch screen of claim 1, wherein the oxidation resistant layer is made of silicon dioxide.

8. The touch screen of claim 1, wherein the sealing layer is made of double-sided adhesive tape.