KR101616950B1 - Touch Screen Panel Assembly And Assembling Method - Google Patents

Abstract

According to the present invention, a touch screen film; A cover glass bonded to the front surface of the touch screen film; And a printing film adhered to the front surface of the cover glass via an optical transparent adhesive (L-OCA), wherein a printing layer is provided on a rear surface of the printing film along an edge of the printing film A touch screen panel assembly is provided. A method of assembling a touch screen panel assembly is also provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch screen panel assembly,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch screen panel assembly and a method of assembling the same, and more particularly, to a touch screen panel assembly in which a print film is bonded to a front surface of a cover glass and a touch screen film is bonded to a rear surface of a cover glass, And a method of assembling the same.

Typically, the touch screen panel assembly is used in a smart phone, a smart pad, a navigation device, or a variety of other electronic devices, and the display panel and the touch screen panel are combined together to form an interface that allows the user to use the electronic device. For example, assuming that a user views the display screen of the smartphone while using it, the user can control or operate the smartphone by simply touching the touch screen panel according to the display screen.

According to the prior art, a touch screen film such as GIF or GFF is formed by forming a baking portion (bezel printing portion) on the back surface of the cover glass and attaching the touch screen film using an optically clear adhesive (OCA) Or an OGS (one glass solution) touch screen panel in which an ITO pattern is formed after baking on the back surface of the cover glass is formed.

The 'back surface' and 'front surface' of the touch screen panel herein are defined with respect to the direction in which the user uses the smartphone. That is, when the user views the smartphone while using it, the user is in the direction of the 'front surface' of the touch screen panel, and the display panel is disposed in the direction of the rear surface of the touch screen panel. A screen displayed on the display panel is displayed to a user through a transparent touch screen panel. The print film and the cover glass disposed on the front surface of the touch screen film are adhered through an optical clear adhesive.

1 is a schematic exploded perspective view of a conventional GFF type touch screen panel assembly.

Referring to the drawings, a baked cover glass 12 is disposed on the front surface of a touch screen film 13 having an FPC 13a. The cover glass 12 is provided with a printed layer 11 printed on its edge along the edge. Although not shown in the drawing, a display panel is disposed on the rear surface of the touch screen film 13. [ An image displayed on a display panel (not shown) is provided to the user through the cover glass 12.

FIG. 2 is a cross-sectional view of the touch screen panel assembly shown in FIG. 1 in a joined state.

Referring to the drawings, the touch screen film 13 and the baked cover glass 12 are bonded through an optical transparent adhesive (OCA) 15. [ The step of baking the cover glass is performed by performing printing at 3 to 5 degrees depending on the presence or absence of the color and the pattern.

As can be understood from the sectional view of Fig. 2, the printing layer 11 provided on the back surface of the baked cover glass 12 forms a step along the edge. Therefore, when the OCA 15 is applied to the surface of the cover glass 12, the possibility of capturing bubbles increases due to the step, and the bubbles trapped in the OCA 15 layer reflect external light, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a touch screen panel assembly and a method of assembling the same which solve the problems of the related art.

It is another object of the present invention to provide a touch screen panel assembly and a method of assembling the same which can prevent deterioration in image quality due to bubbles generated at a joint portion.

Another object of the present invention is to provide a touch screen panel assembly and a method of assembling a touch screen panel that can prevent the scattering of cover glass fragments when the cover glass is damaged by increasing the breaking strength of the cover glass by attaching the print film.

Another object of the present invention is to provide a process for producing a film which is less costly than a chemically reinforced cover glass and which is capable of performing a printing process at 1 to 2 degrees and a printing process of 3 to 5 times to repeatedly perform baking (scratch and scratching of a glass, Adhesion, etc.).

In order to achieve the above object, according to the present invention,

Touch screen film;

A cover glass bonded to the front surface of the touch screen film; And

A printing film adhered to the front surface of the cover glass through an optical transparent adhesive (L-OCA), the printing film being provided on the rear surface of the printing film along the edge of the printing film; A touch screen panel assembly is provided.

According to another embodiment of the present invention, there is provided a method of assembling a touch screen panel assembly including a touch screen film, a cover glass, and a print film,

Joining the cover glass to the front surface of the touch screen film; And

Bonding a print film to a cover glass through a liquid type optical transparent adhesive (L-OCA) on the back surface of the print film, the print film being provided with a print layer along the edge of the print film on a rear surface of the print film, A method of assembling a touch screen panel assembly, the method comprising:

According to an aspect of the present invention, the step of bonding the print film comprises:

Applying a liquid type optical transparent adhesive on the entire surface of the back surface of the print film;

Irradiating the liquid type optical transparent adhesive with ultraviolet light to harden it;

Aligning the cover glass with the print film;

Attaching the cover glass and the print film by roll lamination;

Pressing the cover glass and the print film on which the adhesion is made against each other in a thermostatic chamber; And

And completely curing the liquid type optical transparent adhesive by irradiating ultraviolet rays to the cover glass and the print film.

According to another embodiment of the present invention, the step of bonding the cover glass comprises:

Applying a liquid type optical transparent adhesive on the front surface of the touch screen film;

Irradiating the liquid type optical transparent adhesive with ultraviolet light to harden it;

Aligning the cover glass with the touch screen film;

Attaching the cover glass and the touch screen film by roll lamination;

Pressing the cover glass and the touch screen film on which the adhesion is made against each other in a thermostatic chamber; And

And completely curing the liquid type optical transparent adhesive by irradiating ultraviolet rays to the cover glass and the touch screen film.

According to another aspect of the present invention, the liquid type optical transparent adhesive is applied in a slot die manner.

In the touch screen panel assembly according to the present invention, the step formed by the thickness of the print layer provided on the print film does not affect the bonding between the print film and the cover glass, and therefore, Possibility is excluded. Further, since the bonding performed in the process of assembling the touch screen panel assembly according to the present invention is performed using optical transparent resin (OCR) between the flat surfaces, the possibility of bubbles remaining between the surfaces is reduced.

On the other hand, the print film bonded to the front surface of the cover glass can serve not only to protect the cover glass from external impact, but also to prevent scattering of the cover glass fragments upon breakage of the cover glass. Therefore, it is not necessary to use a separate protective film.

1 is a schematic exploded perspective view of a prior art touch screen panel assembly.
2 is a schematic cross-sectional view of a prior art touch screen panel assembly.
3 is a schematic exploded perspective view of a touch screen panel assembly in accordance with the present invention.
4 is a schematic cross-sectional view of a touch screen panel assembly in accordance with the present invention.
5 is a flowchart illustrating a method of assembling a touch screen panel assembly according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the embodiments shown in the accompanying drawings.

3 is a schematic exploded perspective view of a touch screen panel assembly in accordance with an embodiment of the present invention. The touch screen panel assembly shown in the figures may be used in various electronic devices having a touch screen panel, for example, in a smart phone.

3, a touch screen panel assembly 30 according to an exemplary embodiment of the present invention includes a touch screen film 33, a cover glass 32 bonded to a front surface of the touch screen film 33, And a printing film 31 joined to the front surface of the cover glass 32 and having a printing layer 31a formed thereon. The print layer 31a is printed in a predetermined shape along the edge of the print film 31. [ Display is performed through the window region 31b corresponding to the central portion surrounded by the print layer 31a. The user can observe a display screen from a display panel (not shown) disposed behind the touch screen film 33 through the window region 31b. An FPC (Flexible Printed Cable) 33a is extended from one side of the touch screen film 33.

FIG. 4 is a schematic cross-sectional view of the touch screen panel assembly shown in FIG. 3 in an assembled state.

Referring to the drawings, a cover glass 32 is bonded to a front surface of a touch screen film 33 through a liquid optically clear adhesive (L-OCA) 37. The print film 37 is bonded to the front surface of the cover glass 32 through the liquid type optical transparent adhesive 35.

A liquid optically clear adhesive (L-OCA, 37) remains liquid before being applied to the cover glass. The liquid type optical transparent adhesive 37 is applied to the entire surface of the cover glass 32 and is then bonded to the touch screen film 33 and the print film 37 through a process described in detail later.

As can be understood from the structure of the touch screen panel assembly shown in Figs. 3 and 4, other components are not additionally disposed or bonded to the surface on which the print layer 31a printed on the print film 31 is formed. That is, the step formed by the thickness of the print layer 31a is not affected by the liquid-type optical transparent adhesive (L-OCA) which is filled with the liquid, so that the print film 31 is bonded to the cover glass 32. Therefore, the possibility that microbubbles are generated during the bonding process due to the step difference of the print layer 31a is excluded.

Meanwhile, the bonding performed in the process of constructing the touch screen panel assembly according to the present invention uses a liquid-type optical transparent adhesive (L-OCA) between the flat surfaces, so that the possibility that bubbles remain between the surfaces is reduced. That is, the touch screen panel assembly shown in Fig. 4 is joined between the front surface of the touch screen film 33 and the rear surface of the cover glass 32, and the rear surface of the print film 31 and the cover glass 32, the front surface of the touch screen film 33 on which the bonding is performed has fine irregularities due to the electrode lines, and the rear surface of the printing film 31 has a printing step difference. However, When bonding is performed between the flat rear surface and the front surface of the cover glass 32 through the process of applying the entire surface of the transparent adhesive (L-OCA) to a uniform thickness, the difference in thickness or shape It is possible to prevent the phenomenon of bubble residue after the joining caused by the difference of the bubbles.

On the other hand, the print film 31 bonded to the front surface of the cover glass 32 not only protects the cover glass 32 from external impact, but also splashes off the cover glass pieces 32 at the time of breakage of the cover glass 32 (Scattering) of the liquid can be prevented. That is, even if the cover glass 32 is broken due to an external impact, the fragments of the cover glass bonded to the print film 31 through the liquid type optical transparent adhesive 35 do not scatter around the print film 31, As shown in FIG.

5 is a flow diagram illustrating a method of bonding components using a liquid optically transparent adhesive in a touch screen panel assembly in accordance with the present invention. The joining method described with reference to Fig. 5 can be used not only in the joining between the touch screen film 33 and the cover glass 32 described with reference to Figs. 3 and 4, but also in the joining between the cover glass 32 and the print film Lt; RTI ID = 0.0 > 31). ≪ / RTI > The example shown in Fig. 5 is described with respect to the bonding between the cover glass 32 and the printing film 31. Fig.

  When the bonding process is started (Step 51) and the print film 31 is bonded onto the front surface of the cover glass 32, first, a liquid type optical transparent adhesive 35 is applied to the front surface of the print film 31 (Step 52). The liquid optically transparent adhesive is applied in a continuous line using a slot die method and is thus applied in a face-to-face manner. Since the liquid type optical transparent adhesive (L-OCA) is in a viscous liquid state before curing, a film of a liquid type optical transparent adhesive having a uniform thickness as a whole is formed.

Next, the liquid optically transparent adhesive is cured (step 53). The hardening of the liquid type optical transparent adhesive can be performed by irradiating ultraviolet rays. The liquid type optical transparent adhesive having the hardened state maintains a state of being attached to the print film 31. [ Therefore, the liquid type optical transparent adhesive does not flow on the surface of the print film 31 unless the external force is applied, and does not fall down from the surface of the cover glass 32 even when the print film 31 is turned over.

Next, the cover glass 32 is aligned with the print film 31 (step 54). It is preferable to use a camera vision system for alignment. For example, the alignment state can be confirmed by picking up the cover glass 32 and the print film 31 using a camera vision system. At this time, a specific mark or point of the print layer 31a formed on the print film 31 may serve as marking for alignment.

When alignment is performed, adhesion between the cover glass 32 and the printing film 31 is made (step 55). The cover glass 32 is fixedly disposed on a jig (not shown), and a printing film 31 is disposed on the cover glass 32. The cover glass 32 is heated to a predetermined temperature (35 to 70 degrees Celsius) Lt; RTI ID = 0.0 > pressure. ≪ / RTI > As described above, the liquid type optical transparent adhesive does not fall off from the surface of the print film 31 even if the liquid type optical transparent adhesive applied on the print film 31 faces downward, since the liquid type optical transparent adhesive is in a state of temporary curing.

 Next, the cover glass 32 and the print film 31 to which the adhesion is made are conveyed to the thermostatic chamber. In the thermostat pressurizing chamber, the cover glass 32 and the print film 31 are pressed together (step 56) while the temperature is kept constant. Through this process, the bonding force is increased, and the fine bubbles which may remain in the liquid type optical transparent adhesive are removed. Then, the cover glass 32 and the printing film 31 are irradiated with ultraviolet rays to complete curing (step 57), and the bonding process is ended (step 58).

As mentioned above, the bonding method shown in Fig. 5 can also be applied to the bonding of the touch screen film and the cover glass. The bonding of the touch screen film to the cover glass will be described as follows.

First, a liquid type optical transparent adhesive 37 is applied on the front surface of the touch screen film 33. The liquid optically clear adhesive is applied to the continuous line, i.e., the surface, using a slot die approach. Then, ultraviolet rays are irradiated on the liquid type optical transparent adhesive applied on the front surface of the touch screen film 33 to make it hard.

Thereafter, the cover glass 32 is aligned with the touch screen film 33. Alignment is accomplished using a camera vision system. When alignment is performed, adhesion between the cover glass 32 and the touch screen film 33 is made. It is preferable that the cover glass is fixedly disposed on a jig (not shown), a touch screen film is disposed on the jig, and the pressure is applied by a roller heated to a constant temperature.

 Next, the cover glass 32 and the touch screen film 33 to which the adhesion is made are transferred to the thermostatic chamber. In the thermostatic pressurizing chamber, the cover glass 32 and the touch screen film 33 are pressed together while the temperature is kept constant. Through this process, the bonding force is increased, and minute bubbles that may remain in the liquid type optical transparent adhesive film are removed. Then, ultraviolet rays are applied to the cover glass 32 and the touch screen film 33 to complete the curing of the liquid type optical transparent adhesive, and the bonding process is terminated.

31. Printed film 31a. Printing layer
32. Cover Glass 33. Touch Screen Film

Claims (5)

delete A method of assembling a touch screen panel assembly comprising a touch screen film, a cover glass, and a print film,
Joining the cover glass to the front surface of the touch screen film; And
Bonding a print film to a cover glass through a liquid type optical transparent adhesive (L-OCA) on the back surface of the print film, the print film being provided with a print layer along the edge of the print film on a rear surface of the print film, A step of bonding the film,
Wherein the step of bonding the print film comprises:
Applying a liquid type optical transparent adhesive on the entire surface of the back surface of the print film;
Irradiating the liquid type optical transparent adhesive with ultraviolet light to harden it;
Aligning the cover glass with the print film;
Attaching the cover glass and the print film by roll lamination;
Pressing the cover glass and the print film on which the adhesion is made against each other in a thermostatic chamber; And
And completely curing the liquid type optical transparent adhesive by irradiating ultraviolet rays to the cover glass and the print film. delete 3. The method of claim 2,
The step of bonding the cover glass comprises:
Applying a liquid type optical transparent adhesive on the front surface of the touch screen film;
Irradiating the liquid type optical transparent adhesive with ultraviolet light to harden it;
Aligning the cover glass with the touch screen film;
Attaching the cover glass and the touch screen film by roll lamination;
Pressing the cover glass and the touch screen film on which the adhesion is made against each other in a thermostatic chamber; And
And completely curing the liquid type optical transparent adhesive by irradiating ultraviolet rays to the cover glass and the touch screen film. The method according to claim 2 or 4,
Wherein the liquid optically transparent adhesive is applied in a slot die manner. ≪ RTI ID = 0.0 > 11. < / RTI >

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