CN105404427A - Frame lamination technology for touch screens - Google Patents

Abstract

The invention discloses a touch screen frame sticking process, which comprises a TFT liquid crystal screen module (2) processing process, an OGS touch screen (1) film pasting process, and an OGS touch screen (1) and a TFT liquid crystal screen module (2) Bonding bonding process; in the film bonding process of the OGS touch screen, the wire frame (3) and the indicator position hole (5) are screen printed at the same time; and pasted on the back of the OGS touch screen (1) before the bonding process A layer of explosion-proof film (6), the explosion-proof film (6) and the TFT liquid crystal screen module (2) are pasted by foam glue (7). After adopting the above structure, the bonding between the OGS touch screen and the TFT LCD module is firmer, without bubbles, and the bonding quality is better; at the same time, it saves a process, which improves the production efficiency and saves costs; the explosion-proof film plays a role The effect of being broken first, thereby reducing the pressure effect of external force and avoiding explosion.

Description

Frame sticking process of touch screen

technical field

The invention relates to the technical field of touch screen production, in particular to a touch screen frame sticking process.

Background technique

The production process of capacitive touch screen involves a key process, that is, the bonding process. The traditional touch screen bonding process includes the following steps: clean and dry the surface of the TP sensor and tempered glass panel, and then remove static electricity; paste the TP sensor and tempered glass panel with optical glue and send it to the central vacuum machine for defoaming; Take out the TP sensor and tempered glass panel from the central vacuum machine for mechanical positioning and bonding to form a capacitive touch screen module; select and cut PVC film and PET film; glue and dry PVC film and PET film; The PET film is bonded to the TP sensor and the tempered glass panel respectively to form a capacitive touch module wrapped in a micro-airbag; the module is sent to a central vacuum machine for defoaming; the PVC film and the PET film are removed. At present, there are mainly two types of lamination technologies for TP sensors and tempered glass panels: frame lamination and full lamination. Full lamination has high requirements for equipment and requires a special full lamination factory for processing. The yield rate of products is low, so the manufacturing cost High, and there is a problem after bonding, but it is not easy to repair. In the frame-mounting technology, there will be a certain gap between the TP sensor and the tempered glass panel after bonding, so water ripples are prone to appear after the TP sensor and the tempered glass panel are stressed.

The website of the State Intellectual Property Office also discloses a patent of "bonding process of touch screen" with publication number CN104786483A, which includes a casing and a touch screen. Before the touch screen is bonded to the casing, the bonding surface of the touch screen is roughened, and then Adhesives are used to bond the touch screen to the casing, so as to change the wettability and adhesion of the touch screen surface, improve the adhesion between the touch screen and the casing, and ensure the bonding quality of the product; the rough treatment is corona treatment . However, this bonding process is only suitable for the bonding between the touch screen and the casing, but not for the bonding between the TFT display module and the OGS touch screen; and the corona treatment is processed by using high frequency and high voltage. Corona discharge on the surface of the plastic produces low-temperature plasma, which causes free radical reactions on the surface of the plastic to cross-link the polymer, roughens the surface and increases its wettability to polar solvents. Therefore, these ions are formed by electric shock and Penetration into the surface of the printed object destroys its molecular structure, resulting in the irreparability of the product.

Contents of the invention

The technical problem to be solved by the present invention is to provide a frame-attaching process of a touch screen that is firmly bonded, saves steps, and reduces costs without destroying the surface molecules of the substrate.

In order to solve the above-mentioned technical problems, the frame sticking process of the touch screen provided by the invention includes the processing technology of the TFT liquid crystal screen module, the film sticking process of the OGS touch screen and the laminating process of bonding the OGS touch screen and the TFT liquid crystal screen module; In the film sticking process of the OGS touch screen, the wire frame and the position hole of the indicator light are screen-printed at the same time; and a layer of explosion-proof film is pasted on the back of the OGS touch screen before the lamination process, and the explosion-proof film and the TFT LCD module are passed through the bubble Cotton paste.

After the screen printing of the wire frame and the position hole of the indicator light is carried out on the OGS touch screen at the same time, the back printing is carried out, and the infrared position hole on the OGS touch screen is screen printed.

The position hole for the indicator light is a transparent hole, and its transmittance is more than or equal to 90%.

A product protection film is pasted on the front of the OGS touch screen, and the size of the product protection film is consistent with the frame size of the OGS touch screen, and an extension part is provided at one of the corners to facilitate tearing by hand.

After the screen printing is completed, a layer of back protective film is pasted on the surface of the explosion-proof film, and the back protective film needs to be torn off before the bonding process with the TFT LCD module; the frame size of the back protective film is larger than the wire frame The size of the frame, the unilateral distance between the two is greater than 1mm.

When laminating the OGS touch screen and TFT LCD screen, place the OGS touch screen and TFT LCD screen modules on the fixture respectively, and press and glue the two through foam glue, and the thickness of the foam glue is not greater than 0.5 mm.

The foam glue is composed of the splicing of the first foam glue and the second foam glue, both of which are L-shaped, and the joints of the two are respectively located at two diagonal corners of the frame.

The splicing at each diagonal corner is formed by the cooperation of the stepped concave surface of one foam glue and the stepped convex surface of the other foam glue, and one end of a single foam glue is a stepped concave surface, and the other end is a stepped convex surface .

Before the laminating process, the cross-section of the foam glue includes a release film layer, a double-sided adhesive layer, a foam layer, a double-sided adhesive layer and a release film layer; Tear off the two outer layers of release film, and stick them to the explosion-proof film on the OGS touch screen and the TFT LCD module through the double-sided adhesive layers on both sides of the foam layer.

The release film layer is provided with hand-tearable parts on the two foam glues at one of the spliced diagonal corners.

After adopting above technology, the present invention has following advantage compared with prior art:

1) Since the OGS touch screen and TFT LCD module are pressed and bonded by foam glue, the bonding between the two is firmer, without air bubbles, and the bonding quality is better; at the same time, when screen printing the OGS touch screen, Synchronous screen printing of the wire frame and the indicator light saves a process, improves production efficiency and saves costs; the explosion-proof film is pasted between the OGS touch screen and the TFT LCD module, and once the external force is applied, the explosion-proof film will be activated. To be the first to be broken through, so as to reduce the pressure of external force and avoid explosion;

2) During the production and bonding process of the OGS touch screen, the product protective film is always covered and pasted on the front, which protects the OGS touch screen from the attachment of dust and other sundries on the one hand, and facilitates a series of operations on it on the other hand; In addition, extensions are set on the corners of the product protection film to facilitate hand operation when tearing off the product protection film; similarly, the setting of the back protection film also plays the same role;

3) The foam glue is spliced by two L-shaped first foam glue and second foam glue. On the one hand, it reduces the processing difficulty of the foam glue, and on the other hand, it facilitates the positioning of the position during lamination; at the same time, The combination of stepped concave surface and stepped convex surface is set at the two splicing points to make the splicing positioning more accurate and the splicing more firm; and a hand-tearing part is set at a corner of the release film layer of the foam glue for convenience. It is easy to hold and operate when tearing off the release film layer.

Description of drawings

FIG. 1 is a schematic structural view of the touch screen in the frame bonding process of the touch screen according to the present invention.

FIG. 2 is a schematic diagram of the side structure of the touch screen in the frame bonding process of the touch screen according to the present invention.

FIG. 3 is a schematic structural diagram of an OGS touch screen in the present invention.

FIG. 4 is a schematic diagram of a side partial structure of an OGS touch screen in the present invention.

Fig. 5 is a structural schematic diagram of foam glue in the present invention.

Fig. 6 is a schematic cross-sectional structure diagram of the foam glue in the present invention.

Among them: 1. OGS touch screen; 2. TFT LCD module; 3. Wire frame; 4. Infrared position hole; 5. Indicator position hole; 6. Explosion-proof membrane; 7. Foam glue; 7-1. The first Foam glue; 7-2, second foam glue; 7-3, stepped convex surface; 7-4, stepped concave surface; 7-5, hand tearing part; 7-6, release film layer; 7-7 , double-sided adhesive layer; 7-8, foam layer; 8, product protection film; 9, back protection film; 10, extension.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As can be seen from the schematic structural diagrams of the frame sticking process of the touch screen of the present invention shown in Figures 1 to 5, it includes the processing technology of the TFT liquid crystal screen module 2, the film sticking process of the OGS touch screen 1 and the bonding of the OGS touch screen 1 and the TFT liquid crystal screen module 2 Fitting fitting process. In the film sticking process of the OGS touch screen, the wire frame 3 and the position hole 5 of the indicator light are screen printed at the same time. And before the laminating process, a layer of explosion-proof film 6 is pasted on the back of the OGS touch screen 1, and foam glue 7 is pasted between the explosion-proof film 6 and the TFT liquid crystal screen module 2.

After the screen printing of the line frame 3 and the position hole 5 of the indicator light is carried out on the OGS touch screen 1 at the same time, the back printing is carried out, and the infrared position hole 4 on the OGS touch screen 1 is screen printed.

The indicator light position hole 5 is a transparent hole, and its transmittance is more than or equal to 90%.

A product protection film 8 is pasted on the front of the OGS touch screen 1 . The size of the product protection film 8 is consistent with the size of the frame of the OGS touch screen 1 , and an extension 10 is provided at one of the corners to facilitate tearing by hand.

After the screen printing is completed, a back protection film 9 is pasted on the surface of the explosion-proof film 6, and the back protection film 9 needs to be torn off before the lamination process with the TFT liquid crystal screen. The frame size of the back protection film 9 is larger than the frame size of the wire frame 3 , and the distance between the two sides is greater than 1mm.

When laminating the OGS touch screen 1 and the TFT liquid crystal screen module 2, place the OGS touch screen 1 and the TFT liquid crystal screen module 2 on the fixture respectively, and press and glue the two through the foam glue 7, and foam The thickness of the cotton glue 7 is not greater than 0.5mm.

The foam glue 7 is composed of a first foam glue 7-1 and a second foam glue 7-2, both of which are L-shaped, and the joints of the two are respectively located at two diagonal corners of the frame.

The splicing at each diagonal is formed by the cooperation of the step-shaped concave surface 7-4 of one foam glue and the stepped convex surface 7-3 of the other foam glue, and one end of a single foam glue is a stepped concave surface 7- 4. The other end is a stepped convex surface 7-3.

Before the bonding process of the foam glue 7, its cross section includes a release film layer 7-6, a double-sided adhesive layer 7-7, a foam layer 7-8, a double-sided adhesive layer 7-7 and Release film layer 7-6. When performing the bonding process, the two outer layers of release film layers 7-6 are torn off respectively, and the double-sided adhesive layers 7-7 on both sides of the foam layer 7-8 are connected to the explosion-proof film 6 on the OGS touch screen 1 respectively. Paste, paste with TFT LCD module 2.

The release film layer 7-6 is provided with a hand-tearable part 7-5 on the two foam glues at one of the spliced diagonal corners.

The above is only a preferred and feasible implementation example of the present invention, and cannot therefore limit the scope of rights of the present invention. All corresponding changes should fall within the protection scope of the claims of the present invention.

Claims (10)

1. the frame of touch-screen pastes a technique, the attaching process that it comprises the processing technology of TFT liquid crystal display module (2), the film coating process of OGS touch screen (1) and OGS touch screen (1) and TFT liquid crystal display module (2) is fitted; It is characterized in that: in the film coating process of OGS touch screen, wire frame (3) and pilot lamp location hole (5) are carried out serigraphy simultaneously; And paste one deck blow-out disc (6) at the back side of OGS touch screen (1) before carrying out attaching process, pasted by foam rubber (7) between blow-out disc (6) and TFT liquid crystal display module (2).

2. the frame of touch-screen according to claim 1 pastes technique, it is characterized in that: after serigraphy OGS touch screen (1) being carried out simultaneously to wire frame (3) and pilot lamp location hole (5), carry out again returning print, serigraphy is carried out to the infrared location hole (4) in OGS touch screen (1).

3. the frame of touch-screen according to claim 2 pastes technique, it is characterized in that: described pilot lamp location hole (5) is transparent apertures, its transmitance >=90%.

4. the frame of touch-screen according to claim 1 pastes technique; it is characterized in that: the front of described OGS touch screen (1) is pasted with product protection film (8); the size of this product protection film (8) is consistent with the frame size of OGS touch screen (1), and an edge is provided with the extension (10) be convenient to hand and torn wherein.

5. the frame of touch-screen according to claim 1 pastes technique, it is characterized in that: after serigraphy completes, have one deck back protection film (9) at the surface mount of blow-out disc (6), this back protection film (9) carry out with the attaching process of TFT liquid crystal display before need to be torn; The frame size of back protection film (9) is greater than the frame size of wire frame (3), and both monolateral distances are greater than 1mm.

6. the frame of touch-screen according to claim 5 pastes technique, it is characterized in that: when carrying out OGS touch screen (1) and fitting with TFT liquid crystal display module (2), respectively OGS touch screen (1) and TFT liquid crystal display module (2) are placed on tool, and both are carried out compacting gummed by foam rubber (7), and the thickness of foam rubber (7) is not more than 0.5mm.

7. the frame of touch-screen according to claim 6 pastes technique, it is characterized in that: described foam rubber (7) is spliced by all L-shaped the first foam rubber (7-1) and the second foam rubber (7-2) and formed, and both stitching portions lay respectively at two diagonal angles place of frame.

8. the frame of touch-screen according to claim 7 pastes technique, it is characterized in that: the splicing at each diagonal angle place is formed by the step concave surface (7-4) of one of them foam rubber and step convex surface (7-3) cooperation of another one foam rubber, and one end of single foam rubber is step concave surface (7-4), the other end is then step convex surface (7-3).

9. the frame of touch-screen according to claim 6 pastes technique, it is characterized in that: described foam rubber (7) is before carrying out attaching process, and its xsect comprises release film layer (7-6), layers of two-sided (7-7), foamed cotton layer (7-8), layers of two-sided (7-7) and release film layer (7-6) successively; When carrying out attaching process, respectively the two-layer release film layer (7-6) of outside torn, pasted with the blow-out disc (6) in OGS touch screen (1) respectively by the layers of two-sided (7-7) of foamed cotton layer (7-8) both sides, paste with TFT liquid crystal display module (2).

10. the frame of touch-screen according to claim 9 pastes technique, it is characterized in that: two foam rubber at described release film layer (7-6) the diagonal angle place of a splicing are wherein equipped with hand and tear portion (7-5).