TWI457806B - Capacitive touch screen and manufacturing method thereof - Google Patents

Description

Capacitive touch screen and manufacturing method thereof

The invention relates to a touch screen and a manufacturing method thereof, in particular to a capacitive touch screen and a manufacturing method thereof.

The capacitive touch screen includes two sets of wires that intersect vertically and horizontally in the X direction and the Y direction. The conventional capacitive touch screen wire wiring structure has the following defects: 1. Since the conductive film material of the wire is made of a transparent material, the film layer is thin. The bridge layer located above the intersection of the two sets of wires is prone to wire breakage, resulting in partial wire breakage; 2. The conductive film resistance of the wire is high, which reduces the performance of the touch screen; 3. Parasitic X, Y direction The capacitance is large, the noise reduction performance is poor, and the sensitivity and resolution of the touch screen are reduced. 4. The two sets of wires in the X direction and the Y direction are spatially distributed in the space. In the manufacturing process, the bottom layer of the conductive film of the wire needs to be fabricated first. Then, an insulating film is formed, and then a conductive film of the upper layer is prepared. Since the transparent conductive films of the two sets of wires must be separately fabricated, the color difference between the two conductive films is caused, and the quality of the touch screen is lowered. 5. Since the touch screen lacks a mask structure, the touch screen cannot exclude the display device. Electrical interference, resulting in touch screen performance is affected.

One of the technical problems to be solved by the present invention is to provide a capacitive touch screen, which overcomes the problem that the conventional capacitive touch screen has partial wire breakage, high wire resistance of the conductive film of the wire, low sensitivity and resolution, chromatic aberration, and the like. defect.

The second technical problem to be solved by the present invention is to provide a method for manufacturing a capacitive touch screen, which overcomes the problem that the conventional capacitive touch screen has partial wire breakage, high wire resistance of the conductive film of the wire, and low sensitivity and resolution. Defects such as color difference.

The technical solution adopted by the present invention to solve one of the technical problems is to construct a capacitive touch screen comprising a substrate, a transparent conductive film and an insulating film of two sets of wires arranged along the X and Y directions on the substrate, the two The transparent conductive film of the first set of wires of the group of wires is arranged in sections, and the transparent conductive film of the second set of wires of the two sets of wires is segmented by the first set of wires, the first set of wires Each of the spaced apart positions of the transparent conductive film overlaps with each of the spaced positions of the second set of conductive conductive films; and further includes one or more layers of low resistance conductive corresponding to the first set of conductive transparent conductive films a second set of low-resistance conductive films corresponding to one or more layers of the second set of conductive transparent films; the first set of low-resistance conductive films attached to the first set of spaces disposed along the first set of wires Connecting the first set of wire transparent conductive films to the continuous first set of wires on the substrate of the conductive transparent film portion and the interval of the transparent conductive film; the second group of low resistance conductive films a second set of wires extending across the first set of low-resistance conductive films to the second set of conductive transparent films disposed at intervals to connect the second set of conductive transparent films to a continuous second set of wires; The insulating film is located between the first group of low resistance conductive films and the second group of low resistance conductive films and covers the first group of low resistance conductive films and the first group of low resistance conductive films a second set of low-resistance conductive films covering the insulating film and the connected second set of conductive transparent conductive films unit.

In the capacitive touch screen of the present invention, the insulating film covers all of the first set of low-resistance conductive films, the first set of conductive transparent conductive films connected to the low-resistance conductive film, and the low-resistance conductive film The surface of the substrate adjacent to the transparent conductive film.

In the capacitive touch screen of the present invention, the first set of low-resistance conductive films have a width smaller than a width of the first set of conductive transparent films.

In the capacitive touch screen of the present invention, the width of the second set of low resistance conductive films is smaller than the width of the second set of conductive transparent films.

In the capacitive touch screen of the present invention, the insulating film has one of a rectangular shape, a square shape, a circular shape, or an elliptical shape.

In the capacitive touch screen of the present invention, the first group of low-resistance conductive films are metal bridge films or low-resistance transparent conductive films, and the second group of low-resistance conductive films are metal bridge films or low-resistance transparent conductive films. .

In the capacitive touch screen of the present invention, a mask layer is provided, and the mask layer is attached to the other side surface of the transparent conductive film and the insulating film side of the two sets of wires on the substrate. One or more transparent conductive film layers, the arrangement area of the mask layer corresponding to the arrangement area of the first group of wires and the second group of wires.

In the capacitive touch screen of the present invention, the mask layer is a continuous transparent conductive film layer or a patterned transparent conductive film layer.

In the capacitive touch screen of the present invention, an insulating protective layer covering the mask layer and exposing a local connection point of the mask layer is included.

The technical solution adopted by the present invention to solve the second technical problem is to provide a method for manufacturing a capacitive touch screen, comprising the steps of: S1, simultaneously or separately forming transparent conductive materials of the first group and the second group of wires on the substrate. a film, a transparent conductive film of the first set of wires is arranged in sections, and a transparent conductive film of the second set of wires is arranged in sections at intervals of the first set of wires, each of the first conductive conductive films of the first set of wires and the interval Each of the two sets of conductive transparent films has a one-to-one coincidence position; S2, a first set of low-resistance conductive films corresponding to the first set of conductive transparent films, and a first set of low-resistance conductive films along the first set of conductive lines Attaching the first set of wire transparent conductive films to the continuous first set of wires attached to the spaced apart first set of conductive transparent film portions and the substrate at the interval of the transparent conductive film; S3, forming an insulating film, insulating film Covering a first set of low-resistance conductive films at the intersection of the two sets of wires and a surface of the substrate adjacent to the first set of low-resistance conductive films; S4, making a transparent conductive corresponding to the second set of wires a second group of low-resistance conductive films, the second group of low-resistance conductive films traversing the first group of low-resistance conductive films along the second set of wires in the insulating film and the second set of wire-transparent conductive films disposed at intervals The two sets of wire transparent conductive films are connected into a continuous second set of wires.

In the manufacturing method of the capacitive touch screen of the present invention, the transparent conductive film and the insulating film on the other side of the substrate are provided on the other side surface of the substrate, and the transparent surface is formed on the surface. a step of the conductive film mask layer, the set region of the mask layer corresponding to the arrangement area of the first group of wires and the second group of wires.

In the manufacturing method of the capacitive touch screen wiring of the present invention, the method further comprises: forming an insulating protective layer on the mask layer covering the mask layer and exposing a local connection point of the mask layer; step.

The capacitive touch screen and the manufacturing method thereof for implementing the present invention have the beneficial effects compared with the prior art:

1. The low-resistance conductive film layer is thick, and it is not easy to break the wire, which improves the continuity of the two sets of wires;

2. The line resistance of the low-resistance conductive film layer is much smaller than the line resistance of the transparent wire film layer, which reduces the line resistance of the two sets of wires and improves the performance of the touch screen;

3. When the insulating film is adjacent to one side edge of the second group of conductive transparent film and does not contact the second group of conductive transparent film, the edge of the insulating film does not rise, so the low-resistance conductive film layer does not break at the edge of the insulating film. Line, which improves the yield of the product.

4. The transparent conductive film layers of the two sets of wires can be fabricated at the same time, avoiding the chromatic aberration caused by the separate fabrication, improving the product quality of the touch screen, and at the same time, since the transparent conductive layer is disposed on the back surface of the substrate as a mask layer, it can be effectively eliminated. Electrical interference from the display device to ensure that the touch screen performance is not affected;

5. The cross structure of two sets of low-resistance conductive film layers is adopted, the line resistance of the low-resistance conductive film layer is small, and the low-resistance conductive film can be made narrow, so that the cross-sectional area of the two low-resistance conductive film layers becomes very large. Small, the parasitic capacitance in the X and Y directions is small, so as to reduce the effect of noise, thereby improving the technical performance of the sensitivity and resolution of the touch screen.

1‧‧‧Substrate

2‧‧‧Transparent conductive film

3‧‧‧Insulation film

4‧‧‧Transparent conductive film

5‧‧‧Low-resistance conductive film

6‧‧‧Low-resistance conductive film

7‧‧‧mask layer

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a plan view showing the structure of a node of an embodiment of a capacitive touch screen of the present invention.

Figure 2 is a cross-sectional view taken along line A-A of Figure 1.

Figure 3 is a flow chart showing an embodiment of a method of manufacturing a capacitive touch screen of the present invention.

Referring to FIG. 1 and FIG. 2 , the capacitive touch screen of the present invention comprises a substrate 1 , a transparent conductive film of two sets of wires arranged along the X and Y directions on the substrate 1 , an insulating film 3 , and two sets of low-resistance conductive materials. membrane.

The transparent conductive film 2 of the first set of wires of the two sets of wires is arranged in sections, and the transparent conductive film 4 of the second set of wires is arranged at intervals of the first set of wires, each of the first set of conductive transparent films 2 A spacing position coincides with each of the spaced positions of the second group of conductive transparent films 4 in a one-to-one correspondence.

The first group of low-resistance conductive films 5 of the two sets of low-resistance conductive films are disposed corresponding to the first group of conductive transparent films 2, and the second group of low-resistance conductive films 6 are disposed corresponding to the second group of conductive transparent films 4. The first group of low-resistance conductive films 5 are attached to the portions of the first set of the conductive transparent films 2 and the substrates 1 at intervals of the transparent conductive film in the direction of the first set of wires, and the first set of conductive transparent films are 2 connected into a continuous first set of wires. The second group of low-resistance conductive films 6 are attached to the second group of the conductive transparent films 2 across the first group of the low-resistance conductive films 5 in the second group of wires. A continuous second set of wires.

The low resistance conductive film may include, but not limited to, a metal bridge film or a low resistance transparent conductive film. The first group of low-resistance conductive film 5 and the second group of low-resistance conductive film 6 may be combined as follows: 1. The first group of low-resistance conductive films 5 and the second group of low-resistance conductive films 6 are made of metal Bridge film; 2, the first group of low-resistance conductive film 5 and the second group of low-resistance conductive film 6 are both made of low-resistance transparent conductive film; 3, the first group of low-resistance conductive film 5 uses metal bridge film, the second group of low resistance The conductive film 6 is made of a low-resistance transparent conductive film; 4. The first group of low-resistance conductive films 5 are made of a low-resistance transparent conductive film, and the second group of low-resistance conductive films 6 are made of a metal bridge film.

The insulating film 3 is located between the first group of the low-resistance conductive film 5 and the second group of the low-resistance conductive film 6 and covers the surface of the substrate 1 adjacent to the first group of the low-resistance conductive film 5 and the first group of the low-resistance conductive film 5. The second group of low-resistance conductive films 6 cover the portions of the insulating film 3 and the second set of the conductive transparent films 4 to be connected.

The substrate 1 may be a glass substrate or other transparent plate instead of glass.

In the present embodiment, the insulating film 3 covers all of the first group of low-resistance conductive films 5, and also covers the connection portion of the first group of conductive transparent films 2 connected to the first group of low-resistance conductive films 5 and the first group of wires. The transparent conductive film 2 is connected to the surface of the partial substrate 1. In other embodiments, the insulating film 3 may cover only the intersection portion of the first group of low-resistance conductive films 5 crossing the second group of low-resistance conductive films 6 and the surface of the portion of the substrate 1.

The first group of low-resistance conductive films may be one layer, two layers, three layers or multiple layers, and the second group of low-resistance conductive films may also be one layer, two layers, three layers or multiple layers.

In the present embodiment, the width of the first group of low resistance conductive films 5 is smaller than the width of the first group of the wire transparent conductive films 2. In other embodiments, the width of the first set of low-resistance conductive films 5 may be equal to or greater than the width of the first set of conductive transparent films 2, as needed.

Also, in the present embodiment, the width of the second group of low-resistance conductive films 6 is smaller than the width of the second group of the wire-transparent conductive films 4. In other embodiments, the width of the second set of low-resistance conductive films 6 may be equal to or greater than the width of the second set of conductive transparent films 4, as needed.

In the present embodiment, the shape of the insulating film 3 is a rectangle. In other embodiments, the shape of the insulating film 3 may include, but is not limited to, a square, a circle, or an ellipse.

In order to eliminate electrical interference from the display and ensure the performance of the touch screen is not affected, the capacitive touch screen of the present invention may be provided with a mask layer 7.

Referring to FIG. 2, the mask layer 7 is attached to the other side surface of the substrate 1 on which the two transparent conductive films 2, 4 and the insulating film 3 are disposed, and one or more transparent conductive film layers are used. The arrangement area of the mask layer 7 corresponds to the arrangement area of the first group of wires and the second group of wires, that is, under the condition that the mask requirement is satisfied, the area of the mask layer 7 may be equal to, smaller or larger than the first group of wires and The arrangement area of the second set of wires.

The mask layer 7 may be a continuous transparent conductive film layer, and a transparent conductive film layer that satisfies a desired pattern may be used as needed.

In order to protect the mask layer 7, an insulating protective layer (not shown) covering the mask layer 7 may be provided, and a local connection point of the mask layer is exposed on the insulating protective layer to connect the leads of the mask layer 7.

Please refer to FIG. 1 and FIG. 3 . The manufacturing method of the capacitive touch screen of the present invention comprises the following steps:

In the first step, the transparent conductive films 2 and 4 of the first group and the second group of wires are simultaneously formed on the substrate 1. The transparent conductive film 2 of the first group of wires is arranged in sections, and the second group of wires is disposed. The transparent conductive film 4 is disposed in sections at intervals of the first set of wires. Each of the spaced positions of the first set of conductive transparent films 2 coincides with each of the spaced positions of the second set of conductive transparent films 4.

a second step of fabricating a first set of low-resistance conductive films 5 corresponding to the first set of conductive transparent films 2, the first set of low-resistance conductive films 5 being adhered to the first set of wires disposed at intervals along the first set of wires The first group of conductive transparent films 2 are connected to a continuous first set of wires on the substrate 1 at a portion of the film 2 and at the interval of the transparent conductive film 2.

In the third step, the insulating film 3 is formed, and the insulating film 3 covers the surface of the substrate 1 adjacent to the first group of low-resistance conductive films 5 at the intersection of the two sets of wires and the first group of low-resistance conductive films 5.

In a fourth step, a second set of low-resistance conductive films 6 corresponding to the second set of conductive transparent films 4 are fabricated, and the second set of low-resistance conductive films 6 are covered across the first set of low-resistance conductive films 5 along the second set of wires. The second set of the wire-transparent conductive films 4 are joined into a continuous second group of wires at a portion of the insulating film 3 and the spaced-apart second set of wire-transparent conductive films 4.

In the first step, the transparent conductive films 4, 2 of the first set of wires and the second set of wires are respectively formed on the substrate 1 as needed, without affecting the realization of the object of the present invention.

In other embodiments, in order to realize the mask requirement of the touch screen, the manufacturing method of the capacitive touch screen of the present invention includes the step of fabricating a mask layer, wherein the step of providing two sets of conductive transparent films 2 on the substrate 1 4 and a transparent conductive film mask layer 7 attached to the surface on the other side surface opposite to the insulating film 3, the arrangement area of the mask layer 7 and the arrangement area of the first group of wires and the second group of wires Corresponding. This step can be carried out before, during or after the first step, the second step, the third step, and the fourth step.

In other embodiments, in order to achieve protection of the mask layer 7 of the touch screen, the method of manufacturing the capacitive touch screen of the present invention includes the step of fabricating an insulating protective layer of the mask layer, the step of which is in the mask layer 7 An insulating protective layer covering the mask layer 7 and exposing the local connection points of the mask layer is formed. This step is performed after the above-described step of making a mask layer.

1‧‧‧Substrate

2‧‧‧Transparent conductive film

3‧‧‧Insulation film

4‧‧‧Transparent conductive film

5‧‧‧Low-resistance conductive film

6‧‧‧Low-resistance conductive film

7‧‧‧mask layer

Claims (12)

A capacitive touch screen comprising a substrate, a transparent conductive film and an insulating film of two sets of wires arranged along the X and Y directions on the substrate, the improvement being that a first set of wires of the two sets of wires The transparent conductive film is disposed in sections, and the transparent conductive film of a second set of wires of the two sets of wires is segmented by the first set of wires, and each of the transparent conductive films of the first set of wires a spacing position coincides with each of the spaced positions of the transparent conductive film of the second set of wires; and further comprising a first group of low resistances corresponding to one or more layers of the transparent conductive film of the first set of wires a second set of low-resistance conductive films corresponding to one or more layers of the transparent conductive film of the second set of wires; the first set of low-resistance conductive films are attached at intervals along the first set of wires Connecting the transparent conductive film of the first set of wires to the continuous first conductive wire on the substrate of the first group of wires and the portion of the transparent conductive film at the interval of the transparent conductive film; the second group of low resistance Conductive Connecting the first group of low-resistance conductive films along the second set of wires to the transparent conductive film of the second set of wires disposed at intervals to connect the transparent conductive films of the second set of wires into a continuous one Two sets of wires; the insulating film is located between the first set of low-resistance conductive films and the second set of low-resistance conductive films and adjacent to a side edge of the second set of wires of the transparent conductive film without contacting the second set of wires The transparent conductive film covers the first set of low-resistance conductive film and the surface of the substrate adjacent to the first set of low-resistance conductive films, the second set of low-resistance conductive films covering the insulating film and the connected The transparent conductive film of the two sets of wires is partially. The capacitive touch screen of claim 1, wherein the insulating film Covering all of the first group of low-resistance conductive films, the first group of wires connected to the first group of low-conductivity conductive films, and the portion of the first group of low-resistance conductive films and the transparent conductive film The surface of the substrate. The capacitive touch screen of claim 1, wherein the width of the first set of low-resistance conductive films is smaller than the width of the transparent conductive film of the first set of wires. The capacitive touch screen of claim 1, wherein the width of the second set of low-resistance conductive films is smaller than the width of the transparent conductive film of the second set of wires. The capacitive touch screen of claim 1, wherein the insulating film has a rectangular, square, circular or elliptical shape. The capacitive touch screen of claim 1, wherein the first group of low-resistance conductive films is a metal bridge film or a low-resistance transparent conductive film, and the second group of low-resistance conductive films is The metal bridge film or the low resistance transparent conductive film. The capacitive touch screen of any one of claims 1 to 6, further comprising a mask layer attached to the transparent conductive film on the substrate where the two sets of wires are disposed One or more layers of the transparent conductive film layer on the opposite side surface of the insulating film, the arrangement area of the mask layer corresponding to the arrangement area of the first group of wires and the second group of wires. The capacitive touch screen of claim 7, wherein the mask layer is a continuous transparent conductive film layer or a patterned transparent conductive film layer. The capacitive touch screen of claim 8, wherein an insulating protective layer covering the mask layer and exposing a local connection point of the mask layer is included. A method for manufacturing a capacitive touch screen, comprising the steps of: simultaneously or separately forming a transparent conductive film of a first set of wires and a second set of wires on a substrate, wherein the transparent conductive film of the first set of wires is spaced apart Segmented, the transparent conductive film of the second set of wires is segmented by the first set of wires, the first Each of the spaced positions of the transparent conductive film of the set of wires overlaps with each of the spaced positions of the transparent conductive film of the second set of wires; and a first one of the transparent conductive films corresponding to the first set of wires is formed a low-resistance conductive film, the first set of low-resistance conductive films are attached to the substrate of the first set of wires and the substrate of the transparent conductive film at intervals along the first set of wires The transparent conductive film of the first set of wires is connected to the first set of wires; an insulating film is formed, the insulating film covers the first group of low-resistance conductive at the intersection of the first set of wires and the second set of wires a film and the surface of the substrate adjacent to the first set of low-resistance conductive films, and adjacent to a side edge of the transparent conductive film of the second set of wires without contacting the transparent conductive film of the second set of wires; a second set of low-resistance conductive films on the transparent conductive film of the second set of wires, the second set of low-resistance conductive films covering the first set of low-resistance conductive films in the second set of wires in the second set of wires Membrane and The transparent conductive film of the second set of wires partially disposed across the transparent conductive film of the second set of wires into a continuous connection of the second set of wires. The method of manufacturing a capacitive touch screen according to claim 10, wherein the transparent conductive film including the first set of wires and the second set of wires on the substrate is opposite to a side of the insulating film On the other side surface, a step of forming the transparent conductive film-mask layer on the surface, the arrangement area of the mask layer corresponding to the arrangement area of the first group of wires and the second group of wires. The method for manufacturing a capacitive touch screen according to claim 11, comprising the step of forming an insulating protective layer covering the mask layer and exposing a local connection point of the mask layer on the mask layer. .