KR20140063482A - Manufacturing method of coverglass for touch screen - Google Patents

Abstract

A manufacturing method of a cover glass for a touchscreen includes the steps of: providing a laminated film including a release film; a release agent coat formed on the release film; a base layer formed on the release agent coat; and a window decoration provided on the base layer; providing a liquid adhesive layer on the base layer and the window decoration for planarizing; and attaching the laminated film of an upper glass substrate by using an optical adhesive layer as a medium; and exposing the base layer by removing the release film and a release agent coat.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a cover glass for a touch screen,

The present invention relates to a method of manufacturing a cover glass for a touch screen capable of sensing a contact position of a target object, and a cover glass.

1 is a perspective view illustrating a conventional capacitive touch panel sensor.

Referring to FIG. 1, a conventional touch panel sensor has a lower insulating sheet 10 and an upper insulating sheet 20 bonded to each other. The lower ITO electrode 30 and the upper ITO electrode 40 are vertically arranged on the opposing surfaces of the lower insulating sheet 10 and the upper insulating sheet 20. Specifically, The upper ITO electrode 40 is oriented from the upper side to the lower side on the bottom surface of the upper insulating sheet 20.

There is a predetermined capacitance, that is, a capacitance value corresponding to the area of each intersection at each intersection of the lower ITO electrode 30 and the upper ITO electrode 40 arranged so as to cross each other, The area of a part of the body is added to the area of the upper ITO electrode 40, so that the capacitance value can be changed.

A connection line 48 made of a metal is connected from the end of the upper ITO electrode 40 to the upper insulating sheet 20 to electrically connect the upper ITO electrode 40 and the electrode 52 of the external circuit board 50 And the lower ITO electrode 20 is connected to the circuit board 50 by a separate connection line.

The connection line 48 provided with a metal can be visually confirmed at the upper part of the transparent upper insulating sheet 20. Conventionally, a separate non-transmissive film for the window decoration 65 is formed on the bottom surface of the reinforced substrate 60 such as a separate glass or translucent reinforced plastic so that the connecting line 48 and the circuit board 50 can not be visually recognized , And the reinforcing substrate (60) is disposed on the upper insulating sheet (20).

However, providing a separate reinforcing substrate 60 on the upper insulating sheet 20 causes an increase in the thickness of the touch panel sensor and complicates the assembling process, and an increase in the thickness of the touch panel sensor It may cause the transparency and sharpness of the touch panel sensor to deteriorate, and the sensitivity of the touch panel sensor may be lowered. Therefore, in recent years, the window decoration 45 may be directly formed on the bottom surface of the upper insulating sheet 20, like the touch panel sensor disclosed in the publication No. 10-2011-0137231.

The present invention provides a method of manufacturing a cover glass for a touch screen and a cover glass capable of improving touch sensitivity by minimizing thickness.

The present invention provides a method of manufacturing a cover glass for a touch screen and a cover glass capable of shortening a manufacturing process time.

The present invention also provides a method of manufacturing a cover glass for a touch screen and a cover glass capable of lowering a defective rate due to a position error occurring during bonding between components.

The present invention also provides a method of manufacturing a cover glass for a touch screen and a cover glass capable of minimizing a defective rate caused by bubbles generated by using an adhesive layer during bonding between components.

According to an exemplary embodiment of the present invention, a method of manufacturing a cover glass for a touch screen disposed on a display to sense a contact position of an object is disclosed. A method of making a cover glass for a touch screen includes providing a laminated film comprising a release film, a release agent coating formed on the release film, a base layer formed on the release agent coating, and window decorations provided on the base layer ; Providing a liquid-phase adhesive layer for planarization on the base layer and window decorations; Adhering a laminated film to an upper glass substrate through an optical adhesive layer; And removing the release film and release agent coating to expose the base layer.

Further, the flat adhesive layer including the liquid adhesive layer and the optical adhesive layer, the base layer, and the window decorations can be transferred onto the upper glass substrate at one time.

Further, the liquid-phase adhesive layer is provided by applying a liquid curing agent on the base layer and the window decoration, then curing the liquid curing agent, and allowing the laminated film to adhere to the upper glass substrate via the optical adhesive layer.

When a separate reinforcing substrate having a window decoration formed thereon is directly bonded to the upper insulating sheet by using an optical adhesive layer, an optical adhesive layer having a considerable thickness has to be used in order to compensate the window decoration and the step difference of the reinforcing substrate. Specifically, the optical adhesive layer covering the window decoration of about 20 占 퐉 requires a thickness of at least 100 占 퐉 or more. Therefore, the thick optical adhesive layer causes the touch sensitivity of the touch screen to be lowered, resulting in lowering the transparency. Moreover, there is a difficulty completely preventing the occurrence of bubbles between the optical adhesive layer on the film and the window decoration.

However, in the cover glass according to the present invention, an optical adhesive layer (optically clear adhesive (OCA)) provided on the liquid adhesive layer may be formed to a very thin thickness of several to several tens of micrometers by providing a liquid adhesive layer to remove a step of window decoration have. Accordingly, the overall thickness of the cover glass becomes thinner, which can ultimately realize the effect of improving the sensitivity of the touch screen and improving the transparency. Furthermore, there is also an effect that bubble generation can be minimized between the liquid adhesive layer and the window decoration.

In addition, since the flat adhesive layer, the base layer, and the window decoration are transferred all at once onto the upper glass substrate, the process time can be shortened, and the occurrence of defective rate due to the position error occurring when stacking the layers can be minimized.

For reference, the base layer can be provided by coating and curing a liquid curing agent on a release film, and a PET film or other synthetic resin film having a thickness of about 20 mu m or the like can be directly placed on a release film, When a hard coating resin is used, it can be up to 5 탆.

Further, the laminated film is provided corresponding to at least one upper glass substrate, and can be cut and used corresponding to one upper glass substrate before being adhered to the upper glass substrate.

In addition, the laminated film provided corresponding to at least one upper glass substrate may be in close contact with a glass ledge corresponding to at least one upper glass substrate. Thereafter, the laminated film and the glass ledge may be cut together corresponding to one upper glass substrate, and in this case, the release film and the release agent coating may be cut off.

When a laminated film corresponding to a plurality of upper glass substrates is prepared and used for cutting, a natural finishing treatment is performed in the cutting process. Therefore, it is possible to drastically shorten the time required for finishing the component.

When a separate reinforcing substrate having a window decoration is directly bonded to an upper insulating sheet using an optical adhesive layer, it has heretofore been necessary to use an optical adhesive layer having a considerable thickness in order to offset a step between the window decoration and the reinforcing substrate. Specifically, the optical adhesive layer covering the window decoration of about 20 占 퐉 requires a thickness of at least 100 占 퐉 or more. Therefore, the thick optical adhesive layer causes the touch sensitivity of the touch screen to be lowered, resulting in lowering the transparency. Moreover, there is a difficulty completely preventing the occurrence of bubbles between the optical adhesive layer on the film and the window decoration.

However, in the method of manufacturing a cover glass according to the present invention, a liquid-phase adhesive layer is provided to remove a step of window decoration, and an optical adhesive layer is provided on a flat liquid-phase adhesive layer so that the thickness of the optical adhesive layer is extremely thin Can be formed. Therefore, the overall thickness of the cover glass becomes thinner, which can ultimately realize the effect of improving the sensitivity and transparency of the touch screen, and can prevent air bubbles that may occur between the liquid adhesive layer and the window decoration.

Further, in the method of manufacturing a cover glass according to the present invention, since the flat adhesive layer, the base layer, and the window decoration are transferred onto the upper glass substrate at one time, not only the process time is reduced but also the defective rate due to the position error The occurrence can be minimized.

1 is a perspective view illustrating a conventional touch panel sensor.
2 is a cross-sectional view of a first laminated film bonded to an upper glass substrate of a touch screen in a method of manufacturing a cover glass according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a process of bonding the first laminated film to the upper glass substrate and removing the first release film to expose the first base layer.
4 is a cross-sectional view illustrating a first electrode pattern formed on a first base layer.
5 is a front view and a cross-sectional view of a first laminated film produced to a size corresponding to a plurality of upper glass substrates.
FIG. 6 is a cross-sectional view illustrating a method of manufacturing a semiconductor device according to another embodiment of the present invention. Referring to FIG. 6, a second flat adhesive layer is provided on a first base layer having a first electrode pattern formed thereon, a second laminated film is bonded, And FIG.
7 is a cross-sectional view illustrating a second electrode pattern formed on the second base layer.
8 is a front view and a cross-sectional view of a second laminated film manufactured to have a size corresponding to a plurality of upper glass substrates.
9 is a bottom view of the touch screen of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments. For reference, the same numbers in this description refer to substantially the same elements and can be described with reference to the contents described in the other drawings under these rules, and the contents which are judged to be obvious to the person skilled in the art or repeated can be omitted.

The present invention relates to a method of manufacturing a cover glass for a touch screen for sensing a contact position of a target object on a display and a cover glass provided through the manufacturing method, A method of manufacturing a cover glass for a touch screen according to the present invention will be described in detail.

FIG. 2 is a cross-sectional view of a first laminated film bonded to an upper glass substrate of a touch screen in a method of manufacturing a cover glass according to an embodiment of the present invention, FIG. 3 is a cross- 1 is a cross-sectional view illustrating a process of removing a release film to expose a first base layer, FIG. 4 is a cross-sectional view illustrating a first electrode pattern formed on a first base layer, FIG. 5 is a cross- 6 is a front view and a cross-sectional view of a first laminated film manufactured in a size of 1 to 6 mm. FIG. 6 is a cross-sectional view of a second laminated film provided on a first base layer on which a first electrode pattern is formed, FIG. 7 is a cross-sectional view showing a second electrode pattern formed on the second base layer, and FIG. 8 is a cross-sectional view illustrating a process of bonding a plurality of upper glass To substrate FIG. 9 is a bottom view of the touch screen of FIG. 7; FIG.

2 shows a first laminated film 120 for transferring a first flat adhesive layer 125, a first base layer 123, and a window decoration 124 onto the upper glass substrate 110 at a time .

The first laminated film 120 is formed from the bottom by referring to Figure 2 and includes a first release film 121, a first release agent coating 122, a first base layer 123, a window decoration 124, (125) are stacked in this order. The window decoration 124 is not provided on a separate reinforcing substrate disposed on the uppermost layer as in the conventional art but is provided directly on the upper surface of the first base layer 123. [

3, the first laminated film 120 is in close contact with the upper glass substrate 110 via the first flat adhesive layer 125. [ Thereafter, the first release film 121 may be removed from the first laminated film 120 to expose the first base layer 123.

Then, as shown in FIG. 4, a first electrode pattern 140 is provided on the first base layer 123. In this case, the primer treatment may be performed on the surface of the first base layer 123 before the first electrode pattern 140 is formed so that the first electrode pattern 140 does not easily separate from the surface.

The first electrode pattern 140 may be provided not only by using ITO, IZO, ATO, AZO, carbon nanotubes, transparent organic materials, etc., but also by applying a metal fiber solution and curing the metal fiber solution . For example, silver may be provided by applying or hardening a curing agent solution having nanowires. Here, since the first electrode pattern 140 is provided on the flat first base layer 123, even if transparent conductive ceramics such as ITO having high brittleness is used, there is no part to be refracted, so that the risk of breakage during use is reduced.

Meanwhile, the first electrode pattern may be electrically connected to the flexible circuit board by the first wire member, and the first wire member may be formed on the window decoration with a silver paste or a thin metal electrode.

For reference, a separate index-matched coating layer may be formed first on the first base layer, and the first electrode pattern and the first wire member may be provided. The coating layer may include a component such as silicon oxide or niobium oxide that scatters light or matches the refractive index of light similar to the ITO electrode, and the coating layer may include a material formed on the first base layer The contour line of the one-electrode pattern is prevented from being exposed from the outside. Alternatively, the first base layer may be provided so as to match the refractive index with the first electrode pattern. For example, the first hard coating layer may be made of a transparent organic material and a material having a refractive index of 1.6 or higher may be used to reduce the refractive index difference with ITO to provide an index matching effect.

On the other hand, when the first electrode pattern is formed of an opaque metal, most of metals such as aluminum, copper, nickel, chromium, titanium, gold, and silver, or the metal alloy may be used as the material. However, it is preferable that the first electrode pattern is formed to be thin enough (not more than 3 mu m in general) so as not to be visible from the outside, and the first electrode pattern is an electrode pattern placed on the display, The change in the capacitance value between the first and second electrode patterns due to the contact of the object approaching the touch screen can be easily induced.

In general, the thickness of the plastic film provided with the electrode pattern is approximately 100 to 200 mu m. This is because an electrode layer for an electrode pattern is conventionally formed and an electrode pattern is formed directly on the plastic film through a patterning process such as a photolithography process, and the thickness of the plastic film has to be maintained at least 100 μm or more.

However, in the present invention, the first base layer 123 is provided on the first release film 121, the first base layer 123 is transferred to the upper glass substrate 110, The thickness of the first base layer 123 used in the present invention is substantially the same as the thickness of the second base layer 123 used in the present invention, And may be provided in a super thin film having a thickness of 50 mu m or less, and in some cases, 5 mu m. Therefore, the thickness of the touch screen can be drastically reduced, which improves the sensitivity of the touch screen and contributes to enhancement of the merchantability of the product.

Hereinafter, the manufacturing process of the first laminated film will be described in detail with reference to FIG.

First, the first laminated film 120 may be provided at a size corresponding to at least one upper glass substrate 110, and in this embodiment, a first laminated film 120 of 4 * 4 may be formed at a time Process, and the design can be changed to 5 * 5, 6 * 6, 3 * 4, etc. depending on the intention of the manufacturer.

The first laminated film 120 is formed to have a size corresponding to the plurality of upper glass substrates 110. The first laminated film 120 has a size corresponding to one upper glass substrate 110 before being adhered to the upper glass substrate 110, Can be cut along the line 126 and used.

5, a first release agent coating 122 may be formed on the first release film 121. The first release agent coating 122 may be formed on the first release film 121, The coating 122 may be provided in a layer state and may be placed on the first release film 121 as it is. However, in this case, since bubbles may enter or be displaced in the process of being laid, The liquid material for the first release agent coating 122 is dropped onto the first release film 121 and the first release film 121 is passed through the roller so that the liquid material is discharged from the first release film 121 121 and may be cured to form the first release agent coating 122. [

After the first release agent coating 122 is formed as described above, the first base layer 123 may be formed thereon. It is preferable to form this layer by a roll coating method using a liquid material rather than directly laying the layer material.

Further, after the first base layer 123 is formed, a window decoration 124 is formed. The window decoration 124 may be provided in a frame shape so as to cover the edge of the upper glass substrate 110 to cover the opaque wire and the circuit board electrically connecting the wire and the external device to the edge of the touch screen .

The window decorating 124 may also be formed by dropping a layer state or a liquid material as described above and may be patterned into a frame shape. However, in the case of the window decoration 124, Is preferable because the patterning process can be omitted.

Further, after the window decoration 124 is formed, a liquid material may be dropped to form the first flat adhesive layer 125 and formed by a lamination method.

Hereinabove, the re-manufacturing process of the first laminated film corresponding to the plurality of upper glass substrates has been described.

For reference, in the case of a base layer, a liquid curing agent can be applied and cured on a release film, but a PET film or other synthetic resin film having a thickness of about 20 mu m or other synthetic resin film can be directly placed on a release film .

However, in the manufacturing method according to the present invention, since the first laminated film 120 corresponding to the plurality of upper glass substrates 110 is formed and cut and used, a natural finishing process is performed in the cutting process.

Therefore, the first base film 123 on the first release film 121, the first flat adhesive layer 125 that can be formed on the first base layer 123, and the like, The time required for the finishing process can be shortened.

Since the first flat adhesive layer 125, the first base layer 123 and the window decorations 124 are transferred onto the upper glass substrate 110 at a time, the process time can be shortened, It is possible to minimize the occurrence of the defect rate due to the position error. In addition, since each layer of the touch screen is not bonded using an adhesive layer such as a transparent double-sided adhesive such as OCA, defects due to bubble generation do not occur.

Although the first flat adhesive layer 125 is formed on the first base layer 123 and the window decorations 124 by using a liquid material in the present embodiment, As shown in FIG. In this embodiment, the first flat adhesive layer 125 is provided in a two-layer structure including a liquid-phase adhesive layer 127 and an optical adhesive layer 128, and the liquid-phase adhesive layer 127 has a liquid- (123) and window decoration (124), and then curing the liquid curing agent. The first laminated film 120 can be brought into close contact with the upper glass substrate via the optical adhesive layer 128. For reference, the optical adhesive layer 128 may be provided on the liquid adhesive layer 127 as shown in FIG. 3, or may be provided by being placed on the upper glass substrate.

A method of manufacturing a cover glass according to the present invention is characterized in that a liquid phase adhesive layer 127 is provided to remove the step of the base layer 123 and the window decoration 124 and an optical adhesive layer 128 is formed on the flat liquid phase adhesive layer 127 So that the thickness of the optical adhesive layer 128 can be made very thin to the order of several to several tens of micrometers. Therefore, the overall thickness of the cover glass becomes thinner, which can ultimately realize the effect of improving the sensitivity and transparency of the touch screen, and can prevent air bubbles that may occur between the liquid adhesive layer and the window decoration.

The process of laminating the first flat adhesive layer 125, the first base layer 123, and the window decorations 124 using the first laminated film 120 on the upper glass substrate 110 has been described .

The touch screen may have a second electrode pattern 150 that interacts with the first electrode pattern 140 to detect the position of the target object.

6, the first base layer 123 is transferred onto the upper glass substrate 110 and the second release film 131 and the second release agent coating 132 formed on the second release film 131 And a second base layer 133 formed on the first release agent coating 132 and the second release layer 130 formed on the second release agent coating 132. The second laminate film 130 is formed on the first electrode pattern The second laminated film 130 may be closely contacted to the first base layer 123 formed with the first base layer 123.

7, a second electrode pattern 150 (see FIG. 7) that electrically interacts with the first electrode pattern 140 is formed on the second base layer 133 exposed by removing the second release film 131, ) Can be formed. Here, when the second release film 131 is removed, the second release agent coating 132 may be attached to the second release film 131 and removed together.

It is needless to say that the first laminate film 130 may be formed on the first base layer 123 and the second laminate film 130 may be formed on the first base layer 123, The second base layer 133 may be formed after the second base film 133 is exposed by bringing the second laminated film 130 into close contact with the second flat adhesive layer 135. [ A second wire member 152 for electrically connecting the second electrode pattern 150 and the second electrode pattern 150 to an external device may be formed on the second electrode pattern 150. [

The second laminated film 130 is also provided in a size corresponding to a plurality of (4 * 4) upper glass substrates 110 like the first laminated film 120 and is cut along the second cut line 136 The first electrode layer 140 may be formed on the first base layer 123 by forming a dissection pattern 134 on the first base layer 123 to electrically connect the external device to the first electrode pattern 140. [ The end of the member 142 can be exposed.

9, when the second base layer 133 is transferred onto the first base layer 123 and then the second electrode pattern 150 and the second wire member 152 are formed as described above, A touch screen such as a bar is formed.

Accordingly, when the object approaches the surface of the upper glass substrate 110, a change in the capacitance value caused by the mutual action of the first and second electrode patterns 140 and 150 causes the first and second wire members 142 and 152 Therefore, it can be transmitted to the external device, and the control unit corresponding to the external device can calculate the touch position using the change of the value.

Although the present invention has been described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. It can be understood that

110: upper glass substrate 120: first laminated film
121: first release film 122: first release agent coating
123: first base layer 124: window decoration
125: first flat adhesive layer 126: first cutting line
130: second laminated film 131: second release film
132: Second release agent coating 133: Second base layer
134: incision pattern 135: second flat adhesive layer
136: second cutting line 140: first electrode pattern
142: first wire member 150: second electrode pattern

Claims (6)

A method of manufacturing a cover glass for a touch screen, the touch glass being disposed on an upper surface of the display,
Providing a laminated film comprising a release film, a release agent coating formed on the release film, a base layer formed on the release agent coating, and window decorations provided on the base layer;
Providing a liquid-phase adhesive layer for planarization on the base layer and the window decorations;
Adhering the laminated film to an upper glass substrate through an optical adhesive layer; And
Removing the release film and the release agent coating to expose the base layer;
Wherein the cover glass is formed of a metal. The method according to claim 1,
Wherein the base adhesive layer, the liquid adhesive layer and the optical adhesive layer, the base layer, and the window decoration are transferred onto the upper glass substrate at one time. The method according to claim 1,
The liquid-phase adhesive layer is provided by applying a liquid curing agent on the base layer and the window decoration, and then curing the liquid curing agent, and the laminated film is brought into close contact with the upper glass substrate via the optical adhesive layer Wherein the method comprises the steps of: The method according to claim 1,
Wherein the laminated film is provided corresponding to at least one or more upper glass substrates and is cut to correspond to the upper glass substrate before being brought into close contact with the upper glass substrate. The method according to claim 1,
Characterized in that the laminated film is provided corresponding to at least one or more of the upper glass substrates and is cut out correspondingly to one of the upper glass substrates after closely adhering the laminated film to a glass ledge corresponding to at least one of the upper glass substrates Wherein the method comprises the steps of: A cover glass for a touch screen manufactured by the method for manufacturing a cover glass for a touch screen according to any one of claims 1 to 5.

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