CN106445212A - Touch device and forming method thereof - Google Patents

Abstract

The invention discloses a touch device and a forming method thereof, the touch device comprises a substrate provided with a first surface and a second surface opposite to the first surface, a first touch electrode structure is arranged on the first surface of the substrate, a passivation layer is arranged on the first touch electrode structure, a shading layer is arranged on the passivation layer, wherein a height difference is formed between the shading layer and the passivation layer, a recess is generated on the passivation layer and is surrounded by the shading layer, a protection structure is arranged on the shading layer and the passivation layer and is filled in the recess, and the protection structure is provided with a flat outer surface extending from the upper part of the shading layer to the upper part of the passivation layer.

Description

Touch device and method for forming the same

technical field

The invention relates to a touch device, in particular to a protective structure with a flat outer surface of the touch device.

Background technique

In recent years, portable devices such as mobile computers, mobile phones, smart phones, personal digital assistants, and e-book devices have become more advanced and more functional. Due to the convenience of these devices, these devices have also become one of people's daily necessities. Generally, these devices can be equipped with a touch screen to display data and receive relevant input through the touch screen. For example, when an application program is executed in the device, the user can use a finger to touch and move on the touch screen to input relevant data and instructions, thereby controlling the operation of the application program. Due to the convenient operation of the touch screen, the touch screen has also become one of the most common input interfaces in this generation of devices.

In addition, due to the excellent characteristics of fingerprint recognition in identifying an identity, many portable devices have combined the fingerprint recognition function. Since each person's fingerprint is different, the fingerprint has the characteristic of uniqueness, which greatly improves the security of identity authentication using fingerprint identification. Moreover, the method of identity authentication using fingerprint recognition is also relatively convenient, which saves the user the trouble of memorizing and inputting passwords. However, the existing touch devices with fingerprint recognition function usually have the problem that the distance between the touch surface and the fingerprint recognition device is too far, and the surface of the touch device is uneven, which leads to poor accuracy of the fingerprint recognition function.

Contents of the invention

In order to increase the sensitivity of the edge of the touch device, the present invention provides a protective structure design of the touch device, so that the touch device has a flat outer surface, so as to avoid affecting the touch of the peripheral area due to the uneven outer surface of the touch device. control function sensitivity.

According to some embodiments of the present invention, a touch device is provided, which includes: a substrate having a first surface and a second surface opposite thereto; a first touch electrode structure disposed on the first surface of the substrate; a passivation layer disposed On the first touch electrode structure; the light-shielding layer is arranged on the passivation layer, wherein there is a height difference between the light-shielding layer and the passivation layer, resulting in a depression on the passivation layer and surrounded by the light-shielding layer; and the protection structure is arranged on The light-shielding layer and the passivation layer are filled with depressions, and the protection structure has a flat outer surface extending from above the light-shielding layer to above the passivation layer.

According to some other embodiments of the present invention, a method for forming a touch device is provided, which includes: providing a substrate, the substrate has a first surface and an opposite second surface; forming a first touch electrode structure on the first surface of the substrate; forming a passivation layer on the first touch electrode structure; forming a light-shielding layer on the passivation layer, wherein there is a height difference between the light-shielding layer and the passivation layer; to generate a depression on the passivation layer and surrounded by the light-shielding layer; and forming The protection structure is on the passivation layer and the light-shielding layer and fills the depression. The protection structure has a flat outer surface extending from above the light-shielding layer to above the passivation layer.

Description of drawings

FIG. 1 is a schematic plan view of a touch device according to some embodiments of the present invention;

Fig. 2 is some embodiments of the present invention, a schematic cross-sectional view of a touch device along line 2-2' of Fig. 1;

Fig. 3 is another embodiment of the present invention, a schematic cross-sectional view of a touch device along line 2-2' of Fig. 1;

FIG. 4 is a schematic cross-sectional view of a touch device using the touch structure in FIG. 2 as a fingerprint recognition device according to some embodiments of the present invention;

FIG. 5 is a schematic cross-sectional view of a touch device using the touch structure in FIG. 3 as a fingerprint recognition device according to other embodiments of the present invention.

Symbol Description

100, 300～touch device;

100A～touch area;

100B～surrounding area;

110～substrate;

110A～the first surface of the substrate;

110B～the second surface of the substrate;

120～the first touch electrode structure;

121～the first axial electrode;

122～the second axial electrode;

130～insulation layer;

140, 230 ~ passivation layer;

150～shading layer;

152 ~ depression;

160～protective structure;

161～adhesive layer;

162～protective film;

170～conductive hole;

171 ~ wire;

180～joint pad;

190～external circuit components;

200～touch panel;

210～second substrate;

220～the second touch electrode structure;

240～viscose;

H ~ height difference.

detailed description

Referring to FIG. 1 , it shows a schematic plan view of a touch device 100 according to some embodiments of the present invention, viewed from the perspective that the touch surface is at the bottom. In some embodiments, the touch device 100 may be a capacitive touch panel, which includes a first touch electrode structure 120 disposed on the touch region 100A of the touch device 100 . The first touch electrode structure 120 includes a first axial electrode 121 and a second axial electrode 122 placed alternately in an insulating manner, the first axial electrode 121 extends along a first direction such as the X-axis direction, and the second axial electrode structure 122 extending along a second direction, such as the Y-axis direction. The first touch electrodes 121 and the second touch electrodes 122 can be respectively electrically connected to the bonding pads 180 via wires 171, and the bonding pads 180 are bonded and connected to external circuit components 190 such as a flexible printed circuit board (FPC), thereby connecting the The sensing signal of the first touch electrode structure 120 is transmitted to the integrated circuit on the FPC for processing. These wires 171 and external circuit elements 190 are disposed in the peripheral area 100B of the touch device 100 .

Referring to FIG. 2 , it shows a schematic cross-sectional view of the touch device 100 along line 2-2' of FIG. 1 according to some embodiments of the present invention. The touch device 100 includes a substrate 110 . The substrate 110 is, for example, a glass substrate with a thickness ranging from 0.4 mm to 0.7 mm. The substrate 110 has a first surface 110A and a second surface 110B opposite to the first surface 110A. The first touch electrode structure 120 is disposed above the first surface 110A of the substrate 110 , and the first touch electrode structure 120 includes a first axial electrode 121 and a second axial electrode 122 which are insulated and arranged alternately. In some embodiments, the first axial electrode 121 is formed above the substrate 110, the second axial electrode 122 is formed above the first axial electrode 121, and the first axial electrode 121 may be a driving electrode, and the second axial electrode 121 may be a driving electrode. The electrodes 122 can be receiving electrodes, and vice versa. The touch device 100 further includes an insulating layer 130 disposed between the first axial electrode 121 and the second axial electrode 122 to electrically isolate the first axial electrode 121 and the second axial electrode 122. The material of the insulating layer 130 For example, epoxy resin, solder mask, or other suitable insulating substances, such as silicon oxide layer, silicon nitride layer, silicon oxynitride layer, metal oxide or combinations thereof of inorganic materials; or polyamide of organic polymer materials. For polyimide, parylene, polynaphthalenes, fluorocarbons, acrylates, the thickness of the insulating layer 130 may be in a range of about 2 μm˜3 μm. In addition, in some embodiments, the passivation layer 140 may be covered above the second axial electrode 122 and the insulating layer 130, and the material of the passivation layer 140 is, for example, polyimide (Polyimide), polyimide-like (Polyimide- like material), the thickness of the passivation layer 140 may be in the range of about 2 μm˜3 μm.

In some embodiments, a plurality of conductive holes 170 are formed in the substrate 110 , and the conductive holes 170 penetrate from the first surface 100A to the second surface 100B of the substrate 100 . In some embodiments, the first axis electrodes 121 and the second axis electrodes 122 of the first touch electrode structure 120 can be electrically connected to the wires 171 through the conductive holes 170 , and connected to the bonding pads 180 through the wires 171 . The conductive hole 170 can use laser drilling technology to form a through hole in the substrate 110, and use electroplating, sputtering, etc. to make a conductive connection metal (such as Cu, Ag, Ni, etc.) in the through hole to form the conductive hole 170. , electrically connect the first touch electrode structure 120 to the wire 171 through the conductive hole 170 .

The light-shielding layer 150 is disposed on the passivation layer 140 and located in the peripheral region 100B of the touch device 100. The arrangement of the light-shielding layer 150 can shield the conductive wires 171 located in the peripheral region 100B, preventing the conductive wires 171 made of metal materials from reflecting light and causing damage. affect the appearance of the touch device 100 . The material of the light-shielding layer 150 is, for example, black or photoresist or ink of other colors. The black photoresist can be used to make the light-shielding layer 150 through the coating and photolithography process, or the light-shielding layer 150 can be made in color through the printing process. The ink makes the light-shielding layer 150 . Since the light-shielding layer 150 needs to have a shielding effect, the thickness of the light-shielding layer 150 is usually in the range of about 10 μm to 15 μm, which makes a height difference H between the light-shielding layer 150 and the passivation layer 140, and forms a depression 152 in the passivation layer. The layer 140 is surrounded by a light-shielding layer 150 . In some embodiments, the height difference H is in a range of about 10 μm˜15 μm.

In the existing technology, a protective layer is provided on the surface of the touch device to protect the components in the touch device, such as a scratch-resistant and high-hardness diamond-like carbon film, and its film thickness is usually about 3 μm. In the range of ~5 μm, the height difference H between the light-shielding layer and the passivation layer is usually about 10 μm to 15 μm, and the diamond-like carbon or other protective films used in the prior art cannot make up for this height difference H, making the touch screen There is a height difference of 10 μm to 15 μm between the touch area and the surrounding area of the device, which leads to unevenness on the outer surface of the touch device, thereby affecting the accuracy of the finger touch function at the junction of the touch area and the surrounding area.

According to the embodiments of the present invention, the above-mentioned problems can be solved. As shown in FIG. 2 , an adhesive layer 161 can be formed on the light-shielding layer 150 and the passivation layer 140. The adhesive layer 161 can compensate for the height difference H between the light-shielding layer 150 and the passivation layer 140, and fill the area surrounded by the light-shielding layer 150. The depression 152. The material of the adhesive layer 161 is, for example, optical glue (OCA) or liquid optical glue (LOCA), and the adhesive layer 161 has a flat surface extending from above the light shielding layer 150 to above the passivation layer 140 . In some embodiments, the thickness of the adhesive layer 161 on the passivation layer 140 ranges from about 10 μm to 30 μm, and the optimum thickness range is 15 μm to 20 μm, which is used to compensate for the thickness of the light shielding layer 150 (10 μm to 15 μm). Due to the resulting height difference, the thickness of the adhesive layer 161 on the light shielding layer 150 is less than 5 μm.

After that, the protective film 162 is pasted on the adhesive layer 161 , and the protective film 162 and the adhesive layer 161 together constitute the protective structure 160 of the touch device 100 . The outer surface of the protective film 162 can be used as the touch surface of the touch device 100 while preventing the surface of the touch device 100 from being worn or scratched. In some embodiments, the protective film 162 may be a thin glass substrate or a sapphire substrate with a thickness ranging from about 0.1 mm to 0.2 mm. In this embodiment, the adhesive layer 161 can compensate for the height difference H between the light-shielding layer 150 and the passivation layer 140 and fill up the recess 152, and the protective film 162 has a high hardness to provide a scratch-resistant effect, so the outer surface of the touch device 100 There is no height difference between the touch area 100A and the peripheral area 100B on the surface, so that the outer surface of the touch device 100 becomes a flat surface, thereby improving touch sensitivity.

Referring to FIG. 3 , it is a schematic cross-sectional view of the touch device 100 along line 2-2' of FIG. 1 according to some embodiments of the present invention. In this embodiment, a glass film can be formed on the light-shielding layer 150 and the passivation layer 140 as the protection structure 160 of the touch device 100 by low-temperature deposition technology. In some embodiments, the thickness of the protective structure 160 formed by the glass film is between 10 μm and 200 μm, and the most preferred embodiment is in the range of 20 μm to 30 μm. The glass film formed by low temperature deposition technology can be used as the protective structure 160 to compensate The height difference H between the light shielding layer 150 and the passivation layer 140 fills up the recess 152 surrounded by the light shielding layer 150 . There is no height difference between the touch area 100A and the peripheral area 100B on the outer surface of the touch device 100, and the outer surface of the touch device 100 becomes a flat surface, thereby improving the touch at the junction of the touch area 100A and the peripheral area 100B. control sensitivity. In addition, the protection structure 160 formed by the glass film has the characteristics of scratch resistance and high hardness at the same time, so it can also serve as the touch surface of the touch device 100 and protect the components inside the touch device 100 . Furthermore, since the thickness of the protective structure 160 formed by the glass film is thinner than that of the embodiment shown in FIG. The touch sensitivity of the touch device 100, in other words, when the distance between the finger and the first touch electrode structure 120 is reduced to 20 μm-30 μm, the amount of capacitance change between the ridges and valleys of the fingerprint can be reduced by the back-end processing gas Fully identified and the error value is greatly reduced.

In some embodiments, the thickness of the glass film on the light-shielding layer 150 is the difference between the thickness of the glass film on the passivation layer 140 and the light-shielding layer 150, thereby saving the production process and completing the production of the glass film at one time. In this embodiment, the thickness of the glass film on the light-shielding layer 150 is 5 μm˜15 μm.

Referring to FIG. 4 , it is a schematic cross-sectional view of a touch device 300 using the touch structure of the touch device 100 in FIG. 2 as a fingerprint recognition device according to some embodiments of the present invention. In some embodiments, the above-mentioned first touch electrode structure 120 can be used as a fingerprint identification device, and another touch panel 200 with a touch position sensing function can be combined under the first touch electrode structure 120 to A touch device 300 with functions of fingerprint identification and touch position sensing is formed.

In some embodiments, the substrate 110 can be used as an upper cover of the touch panel 200 , and the touch panel 200 further includes a second substrate 210 disposed opposite to the substrate 110 , the second substrate 210 is, for example, a glass substrate or a plastic substrate. The first touch electrode structure 120 of this application can sense the texture of the object (such as a fingerprint) and the coordinate position of the object. In some embodiments, a second touch electrode structure 220 can be additionally added as a touch sensing position. The second touch electrode structure 220 is formed on the second substrate 210, and a passivation layer 230 is formed on the second touch electrode structure 220 to protect the second touch electrode structure 220, and an adhesive 240 is formed on the passivation layer 230 Used to combine the passivation layer 230 and the substrate 110 . In other embodiments, the second touch electrode structure 220 may be directly disposed under the second surface 110B of the substrate 110 . In this embodiment, the second touch electrode structure 220 can provide the location where the operator touches the touch device 300 with fingerprint recognition function, and the touch panel 200 can be capacitive touch, resistive touch or other Existing touch methods. In some embodiments, the second touch electrode structure 220 may be a single-layer indium tin oxide (SITO) touch structure or a double-layer indium tin oxide (DITO) touch structure. Although FIG. 4 shows that the embodiment of FIG. 2 is combined with the touch panel 200 to form the touch device 300 , the embodiment of FIG. 3 can also be combined with the touch panel 200 to form the touch device 300 .

Referring to FIG. 5 , it is a schematic cross-sectional view of a touch device 300 using the touch structure of the touch device 100 in FIG. 3 as a fingerprint recognition device according to other embodiments of the present invention. In some embodiments, the substrate 110 can be used as the upper cover of the touch panel 200, and the second touch electrode structure 220 is directly formed on the second surface 110B of the substrate 110, and is formed under the second touch electrode structure 220. The passivation layer 230 is used to protect the second touch electrode structure 220 . Then attach the second substrate 210 under the passivation layer 230 to form the touch panel 200 . The touch panel 200 can be capacitive touch, resistive touch or other existing touch methods. The second touch electrode structure 220 may be a single-layer indium tin oxide (SITO) touch structure or a double-layer indium tin oxide (DITO) touch structure. Although FIG. 5 shows that the embodiment of FIG. 3 is combined with the touch panel 200 to form the touch device 300 , the above embodiment of FIG. 2 can also be combined with the touch panel 200 to form the touch device 300 .

Since the substrate 110 is thicker than the protective structure 160, the thinned protective structure 160 can be prevented from cracking, and the supporting strength of the whole touch device can be provided. Furthermore, compared with the method of forming the touch electrodes on the thinned protective structure 160, the embodiment of the present invention forms the first touch electrode structure 120 on the substrate 110, which can reduce the fragments caused by movement or strengthening during the production process. The efficiency can also reduce the risk of breakage caused when the bonding pad 180 is combined with the flexible printed circuit board.

To sum up, the present invention provides a protection structure for a touch device. The protection structure enables the touch device to have a flat outer surface, thereby improving the touch sensitivity of the touch device at the junction of the touch area and the peripheral area.

Although the present invention has been disclosed in conjunction with the above preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the appended claims.

Claims (18)

1. a kind of contactor control device, including：

Substrate, has first surface and second surface corresponding thereto；

First touch electrode structure, is arranged on this first surface of this substrate；

Passivation layer, is arranged on this first touch electrode structure；

Light shield layer, is arranged on this passivation layer, and wherein this light shield layer and this passivation interlayer have a difference in height, Produce one depression on this passivation layer and by this light shield layer around；And

Protection structure, is arranged on this light shield layer and this passivation layer and fills up this depression, and this protection structure has One is had to extend to the flat outer surface above this passivation layer above this light shield layer.

2. contactor control device as claimed in claim 1, wherein this protection structure include adhesion coating and protection Film, this adhesion coating fills up this and is recessed and covers this light shield layer and this passivation layer, and this protecting film is arranged at this and glues On layer, and this flat outer surface of this protection structure is a surface of this protecting film.

3. contactor control device as claimed in claim 2, wherein this adhesion coating make up this light shield layer and this passivation This difference in height of interlayer, and there are flat surfaces.

4. contactor control device as claimed in claim 2, wherein this protecting film are a glass substrate, have thickness Degree scope is 0.1mm～0.3mm.

5. contactor control device as claimed in claim 1, wherein this protection structure are a glass-film, this glass Thickness range above this passivation layer for the film is 20 μm～30 μm, and this glass-film is above this light shield layer Thickness range is 5 μm～15 μm.

6. contactor control device as claimed in claim 1, wherein this first touch electrode structure are distinguished for a fingerprint A part for identification device.

7. contactor control device as claimed in claim 6, also includes second touch control electrode structure, is arranged at this Below this second surface of substrate, this second touch control electrode structure is of a position of touch sensing device further Point.

8. contactor control device as claimed in claim 1, wherein this first touch electrode structure include first axle To electrode and the second axial electrode, this first axial electrode is drive electrode, and this second axial electrode is to connect Receive electrode.

9. contactor control device as claimed in claim 8, also includes insulating barrier, is arranged at this first axial direction electricity Between pole and this second axial electrode.

10. contactor control device as claimed in claim 1, also includes multiple conductive holes and runs through this substrate, should First touch electrode structure is electrically connected to a wire via those conductive holes.

11. contactor control devices as claimed in claim 1, wherein this substrate are glass substrate, have thickness Scope is 0.4mm～0.7mm.

A kind of 12. forming methods of contactor control device, including：

There is provided a substrate, this substrate has a first surface and a second surface corresponding thereto；

Form one first touch electrode structure on this first surface of this substrate；

Form a passivation layer on this first touch electrode structure；

Form a light shield layer on this passivation layer, wherein this light shield layer and this passivation interlayer have a height Difference, with produce a depression on this passivation layer and by this light shield layer around；And

Form a protection structure and and fill up this depression on passivation layer and this light shield layer, this protection structure has One extends to the flat outer surface above this passivation layer above this light shield layer.

The forming method of 13. contactor control devices as claimed in claim 12, wherein forms this protection structure Step includes forming an adhesion coating and covers this light shield layer and this passivation layer and fill up this depression, and provides one Protecting film is attached on this adhesion coating.

The forming method of 14. contactor control devices as claimed in claim 12, wherein forms this protection structure Step includes forming a glass-film with a preparation technology in low temperature, and this glass-film fills up this depression.

The forming method of 15. contactor control devices as claimed in claim 12, wherein this first touch control electrode are tied Structure constitutes a part for a fingeprint distinguisher.

The forming method of 16. contactor control devices as claimed in claim 15, also includes forming one second touch-control Below this second surface of this substrate, this second touch control electrode structure is a position of touch sense to electrode structure Survey a part for device.

The forming method of 17. contactor control devices as claimed in claim 12, wherein forms this first touch-control electricity The step of pole structure includes forming one first axial electrode and one second axial electrode, this first axial electrode For drive electrode, this second axial electrode is receiving electrode.

The forming method of 18. contactor control devices as claimed in claim 12, also includes formation and runs through this substrate Multiple conductive holes, and this first touch electrode structure is electrically connected to a wire via the plurality of conductive hole.