CN103135865B - touch module and preparation method thereof - Google Patents

Abstract

The present invention relates to a kind of touch module, comprising: a touch control component, a housing and a decorating film. Wherein, this housing is bending, and has the touch area of a bending, and described touch control component covers this touch area, and this touch area is used for this touch control component of touch-control; And this touch control component, housing and decorating film are one-body molded. The preparation method that the invention still further relates to a kind of above-mentioned touch module, this preparation method prepares this touch module mainly by conjunction with in-mold decoration processing procedure and two-sided film-coating technique.

Description

Touch module and preparation method thereof

technical field

The present invention relates to a touch module and a preparation method thereof, in particular to a touch module with a touch function and a preparation method thereof.

Background technique

In recent years, with the diversified development of electronic devices with touch function, the appearance design of the electronic device with touch function is gradually moving toward 2.5-dimensional (2.5D) or 3-dimensional (3D) curved surface design. However, if the existing touch technology meets the product design requirements of curved surfaces, there are great challenges in both materials and processes.

First of all, in terms of materials, whether the existing touch screens are resistive touch screens or capacitive touch screens, ITO is used as the transparent conductive layer. However, since ITO itself is a brittle material and has poor bending resistance, it is prone to damage during curved surface processing, resulting in poor electrical conductivity.

In terms of manufacturing process, if the existing capacitive touch screen is to be processed on a curved surface, it is necessary to first bond the ITO transparent conductive layer to the curved glass substrate, and then attach it to the cover of the electronic device ( CoverLens). Due to the extremely low yield rate of the two stages of curved glass processing and hard-mount hard process, the mass production of electronic devices with curved surfaces and touch functions is relatively poor, resulting in relatively high production costs.

Contents of the invention

In view of this, it is necessary to provide a touch module with curved surface and touch function and its preparation method. The touch module is not only three-dimensional, but also has touch function, and the production cost is relatively low.

A touch module includes: a touch element, a casing and a decoration film. Wherein, the housing is curved and has a curved touch area, the touch element covers the touch area, the shape change trend of the touch element is the same as the shape change trend of the touch area, and the touch area It is used to touch the touch element; and the touch element, the casing and the decorative film are integrally formed, and the edge of the touch element is covered by the casing.

A method for manufacturing a touch module, comprising the following steps: providing a touch element, a decorative film, and a mold, wherein the touch element is a flexible element, and the mold includes a master mold and a male mold, The female mold and the male mold respectively have a parting surface, and the parting surface is curved; the touch element and the decorative film are respectively fixed on the parting surfaces of the female mold and the male mold, the The shape change trend of the touch element and the decorative film is the same as the shape change trend of the parting surface; the mold is closed, and an injection molding material is injected into the mold for injection molding, so that the injection molding material forms a shell , so as to form the touch module; and demoulding, taking out the touch module, the touch element, the casing and the decorative film are integrally formed, and the edge of the touch element is covered by the casing.

Compared with the prior art, the touch module provided by the present invention has the following advantages: the housing in the touch module is curved, and the touch element covers the touch area on the curved housing, And the touch element, the casing and the decorative film are integrally formed, so that the touch element and the decorative film are firmly fixed on the curved casing, so the touch module not only has a three-dimensional appearance but also has a touch Features. In addition, the preparation method of the touch module provided by the present invention integrates the in-mold decoration molding process and the double-coated film technology, and the touch element and the decorative film are simultaneously produced by the in-mold decoration molding process to form the touch panel. module, so that the manufacturing method of the touch module is relatively simple, and the cost is relatively low.

Description of drawings

FIG. 1 is a schematic diagram of a touch module provided by an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view along line III-III in Fig. 1 of the embodiment of the present invention.

FIG. 3 is a schematic structural diagram of the touch element and the decorative film in FIG. 1 .

4 to 7 are schematic diagrams of the manufacturing process of the touch module according to the embodiment of the present invention.

Description of main component symbols

Mold 100

master model 110

Cavity 112

Male model 120

Injection port 122

Touch Module 20

Touch element 210

Base 212

Carbon nanotube layer 214

first electrode 216

second electrode 218

Flexible Circuit Board 219

Housing 220

touch area 222

Decorative film 230

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

The invention provides a touch module with a curved surface. The touch module includes a touch element, a casing and a decorative film. Wherein, the housing is curved, and the whole is curved. The casing has a curved touch area, the touch element covers the touch area, and the touch area is used to touch the touch element and display the display page of the electronic device using the touch module. The touch element, the casing and the decorative film are integrally formed.

The touch module is three-dimensional and has a 2.5-dimensional (2.5D) or 3-dimensional (3D) structure. The touch module can be a cover plate of a mobile phone, a casing of an integrated navigation system for a car, or a casing of a three-dimensional touch panel made by Japan Photo Printing Trial.

The shell can be in a curved state such as an arc or a step, so that the shell is not a flat structure, but has a 2.5D or 3D structure, so that the shell shows a curved appearance. The touch area is arranged at the bend of the housing, so that the touch area is also curved like an arc or a step. The housing has an outer surface and an inner surface opposite to the outer surface, wherein the outer surface is a surface facing the user; the outer surface and the inner surface of the touch area of the housing are respectively the outer surface of the housing with part of the inner surface. The touch element can be attached to the decorative film on opposite sides of the casing respectively, wherein the touch element is attached to the inner surface of the casing and is connected to the inner surface of the touch area. The surface is bonded, and the decorative film is bonded to the outer surface of the casing, so that the casing is fixed between the touch element and the decorative film. It can be understood that the touch element can also be arranged on the outer surface of the casing, so that the touch element is fixed between the casing and the decoration film.

The casing can be the casing of electronic devices such as mobile phones, navigators, and steering wheels. The material of the housing can be transparent materials such as polystyrene (PS), polycarbonate (PC) or polymethyl methacrylate (PMMA); it can also be acrylonitrile-butadiene-styrene copolymer ( ABS), polyethylene terephthalate (PET), polycarbonate/acrylonitrile-butadiene-styrene copolymer blend (PC/ABS), polycarbonate/polybutylene terephthalate Ester blends (PC/PBT), polycarbonate/polyethylene terephthalate blends (PC/PET), polycarbonate/polymethyl methacrylate blends (PC/PMMA) or Colored or opaque plastics such as polyamide (PA). The material and thickness of the shell can be selected according to actual needs, for example, when the shell needs to be transparent, the material of the shell can be PMMA. Wherein, when the housing is made of a transparent material, the touch module can be used in a display device. When the housing is made of colored or opaque material, the touch module can be used in electronic devices that do not need a display, such as a steering wheel.

The touch element is integrally formed with the casing, and the edge of the touch element is covered by the casing, so that the touch element is firmly fixed on the casing. Specifically, since the touch area is in a curved state and the touch element is a flexible component, the touch element covers the touch area as the shape of the touch area changes, so that the touch element is fixed on the shell The surroundings of the touch area on the body also make the touch element in a curved state in the touch module, and the shape change trend of the touch element in the touch module is basically the same as the shape change trend of the touch area same. For example, when the touch area of the housing is arc-shaped, the touch element covers the touch area along with the arc shape of the touch area, and is fixed around the touch area, so that the touch element is in the The touch module is also arc-shaped. When the touch area of the housing is stepped, the touch element is fixed around the touch area as the state of the touch area changes, so that the touch element is also stepped in the touch module .

The touch element is a capacitive carbon nanotube touch sensor. The touch element includes a carbon nanotube layer and at least two electrodes electrically connected with the carbon nanotube layer, and the carbon nanotube layer is arranged close to the decoration film. The carbon nanotube layer is mainly used as a transparent conductive layer in the touch element, so the carbon nanotube layer covers the touch area of the housing. The carbon nanotube layer includes a plurality of carbon nanotubes; preferably, the plurality of carbon nanotubes are preferentially oriented and extended in the same direction, and the carbon nanotubes in the same extending direction are connected end-to-end with their adjacent carbon nanotubes by van der Waals force. Wherein, the carbon nanotube layer includes at least one carbon nanotube film. When the carbon nanotube layer includes a plurality of carbon nanotube films, the carbon nanotube films can be arranged in parallel and coplanarly without gaps or stacked, and the carbon nanotubes in the plurality of carbon nanotube films are basically along the same direction Preferred orientation arrangement, that is, the arrangement directions of carbon nanotubes in adjacent carbon nanotube films are basically the same. Because the carbon nanotubes in the carbon nanotube film have good flexibility, the carbon nanotube film has good flexibility, can be bent and folded into any shape and is not easy to break; and still has good transparency and conductivity sex. The carbon nanotube layer has a thickness of 0.5 nanometers to 100 micrometers; preferably, the carbon nanotube layer has a thickness of 100 nanometers to 200 nanometers. The carbon nanotube layer has an ideal light transmittance, and the visible light transmittance of the single-layer carbon nanotube film is greater than 85%. Luminosity is enough.

The at least two electrodes are arranged on the surface of the carbon nanotube layer and are electrically connected with the at least two electrodes. The material of the electrode is metal, carbon nanotube, conductive silver paste or other conductive materials, as long as the electrode can conduct electricity. Preferably, the material of the electrode is carbon nanotubes or conductive silver paste; wherein, the conductivity of carbon nanotubes and conductive silver paste is hardly affected by bending or less affected by bending, and is a flexible material.

The touch element further includes a flexible substrate, and the carbon nanotube layer is disposed on the surface of the flexible substrate. The carbon nanotube layer is disposed close to the decorative film, and the flexible substrate is disposed away from the decorative film, and is used to support the carbon nanotube layer and the at least two electrodes. The material of the flexible substrate is a material with characteristics such as flexibility, high temperature resistance and electrical insulation, specifically polycarbonate (PC), polymethyl methacrylate (PMMA) or polyethylene terephthalate ( PET), or materials such as polyethersulfone (PES), cellulose ester, polyvinyl chloride (PVC), benzocyclobutene (BCB) or acrylic resin. Preferably, the material of the flexible substrate is a transparent flexible material such as PMMA or PC.

The touch control element may further include a flexible circuit board, which is arranged on one side of the carbon nanotube layer and electrically connected to the at least two electrodes, for being electrically connected to other units, so that The touch element works.

It can be understood that other functional layers, such as shielding layers, protective layers, etc., can also be added to the touch element at appropriate positions.

The decorative film is mainly used to identify the touch module, so that the touch module has a certain pattern or color, so as to achieve an aesthetic appearance of the touch module, and can also display that the touch module realizes Icons and brands of touch buttons for various functions. The decorative film is arranged corresponding to the outer surface of the casing, so the shape of the decorative film should be the same as that of the outer surface of the casing, and it will change with the shape of the outer surface of the casing. The decorative film is arranged on the surface of the touch module, which is directly visible to the user, so the decorative film also has the function of preventing the housing from being worn and scratched. The decorative film can also include a metal film layer formed by vacuum evaporation, vacuum sputtering and other methods, and the decorative film can make the surface of the touch module appear metallic. Wherein, when the touch module is applied to a display device, the part of the decorative film corresponding to the touch area of the casing should be transparent so that the user can see the display page of the display device; other areas of the decorative film Can be designed into the desired color.

The touch element and the decorative film in the touch module are integrally molded by the injection molding material, and the injection molded material forms a shell, so the touch element and the decorative film can be firmly fixed on the shell at the same time. physically. In addition, since the touch element has a touch function, the touch module also has a touch function. In addition, since the touch element is flexible and bendable, the touch module is three-dimensional and has a 2.5-dimensional or 3-dimensional structure. Therefore, the touch module can not only have a touch function, but also have a three-dimensional structure.

The present invention further provides a method for preparing the above-mentioned touch module. The preparation method mainly combines the in-mold decoration process and double-coated film technology to prepare the touch module. Specifically, the preparation method includes the following steps: a, providing the touch element, the decorative film and a mold, the mold including a master mold and a male mold; b, separately forming the touch element and the decorative film fixed on the female mold and the male mold; c, mold closing, injecting an injection molding material into the mold for injection molding to form the touch module; and d, demolding, taking out the touch module mod.

In step a, the female mold and the male mold in the mold are molded together to form a mold cavity, and the mold cavity is used for placing the touch element and the decorative film. The specific structure of the mold is related to the required structure of the touch module. The mold can be made according to the structure of the touch module, especially the mold can be made according to the structure of the shell. An injection port is formed on the male mold for injecting the injection material to be molded into the mold cavity. The shape of the mold cavity should match the shape of the touch module.

The surface of the female mold facing the male mold is the parting surface of the female mold, the parting surface of the female mold has a selected area, and the selected area is used to fix the area of the touch element, the female mold The shape and structure of the selected area of the parting surface for fixing the touch element should match the shape of the touch element, so as to fix the touch element on the parting surface of the master mold.

The male mold is provided with an injection port through the male mold for injecting molten injection material into the mold cavity. Preferably, the injection port is set in the mold cavity close to the edge of the mold cavity, so as to ensure that the injection molded head is formed in the non-touch area of the housing, and basically does not affect the carbon nanotube layer in the touch element conductivity. It can be understood that the mold can have multiple injection ports. The surface of the male mold facing the female mold is the parting surface of the male mold. The parting surface of the male mold has a selected area, and the shape and structure of the selected area of the male mold parting surface are consistent with the decoration The form fit of the film is used to fix the decorative film on the parting surface of the male mold. The mold parting surface of the male mold is opposite to the mold parting surface of the female mold, and can form the mold cavity.

The mold may further include a first film feeding device, and the first film feeding device includes a pair of film conveying wheels and a pair of guiding wheels. The pair of film conveying wheels are respectively arranged on the upper and lower sides of the mould, and are used for pulling the decorative film and conveying the decorative film into the mold cavity of the mould. The guide wheels are used to guide the conveying direction of the decorative film.

Step b is fixing the touch element to the selected area of the master mold, and the flexible base of the touch element is attached to the selected area of the master mold; and fixing the decorative film to the male mold on the selected area of the model. Wherein, the touch element can be fixed on the selected area of the master mold by vacuum adsorption.

The decorative film can be conveyed to the selected area of the male mold through the first film feeding device, specifically, the decorative film is pulled by the first film feeding device and made to move along the direction of the male mold. The parting surface is sent between the male mold and the female mold and positioned on the parting surface of the male mold, so that the decorative film is attached to a selected area of the parting surface of the male mold 120 .

The mold further includes a second film feeding device. The structure of the second film feeding device is the same as that of the first film feeding device, the touch element can be sent to the selected area of the master mold through the second film feeding device, specifically, the touch element is in the Under the traction of the second film feeding device, it is sent to the selected area of the master mold along the parting surface of the master mold, so that the touch element is firmly fixed on the selected area of the master mold.

Step c specifically includes the following steps: firstly, combining the male mold and the female mold to form the mold cavity. Secondly, the injection molding material is filled, and the injection molding material is injected into the mold cavity from the injection port of the male mold until the injection molding material completely fills the mold cavity; it is fixed on the parting surface of the male mold The decorative film and the touch element fixed on the parting surface of the master mold are adhered to the surface of the injection molding material at the same time. Then, the injection molding material is cooled, and the injection molding material is formed into the casing, thereby forming a touch module in which the touch element, the casing, and the decorative film are integrally molded. Wherein, the injection molding material is the raw material of the shell.

When the decorative film is conveyed by the first film feeding device, under the extrusion of the parting surface of the male mold, the decorative film adhered to the surface of the injection molding material is cut from the first film feeding device. to separate it from the decorative film on the first film feeding device.

Step d is to open the male mold and the female mold, and push out the touch module to obtain a touch module with a decorative film and a touch element attached to the surface.

Since the touch element includes a carbon nanotube layer, the carbon nanotube layer has good flexibility and can be a roll material, and the touch element is a flexible element, so a roll-to-roll process (roll-to-roll) can be used. -roll) provides the touch element, therefore, the second film feeding device provided by the mold can quickly provide the touch element, so as to achieve rapid production of the touch module, thereby improving production efficiency and reducing production cost purposes. Since the carbon nanotube layer has the characteristics of better bending resistance, high pressure resistance, high temperature resistance, stable properties and strong surface wear resistance, in the process of preparing the touch module by the above method, the carbon The nanotube layer is basically not damaged and still has good conductivity; for example, the carbon nanotube layer is still flexible after passing through 285°C and 700 atmospheres, its surface is basically not damaged, and the conductivity basically has no significant change ; Therefore, the touch module has a touch function. The touch module adopts the method of in-mold injection molding and double-coated film to form the casing, and at the same time, the touch element and the decorative film are fixed on the casing together. Therefore, the touch module The group preparation method is relatively simple. In addition, since the touch element is flexible, the yield of the touch module is relatively high.

The touch module provided by the present invention and the manufacturing method thereof will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to FIG. 1 to FIG. 2 , the embodiment of the present invention provides a touch module 20 , and the touch module 20 includes a touch element 210 , a housing 220 and a decoration film 230 . Wherein, the casing 220 is disposed between the touch element 210 and the decoration film 230 , the touch element 210 and the decoration film 230 are integrally formed, and the periphery of the touch element 210 is covered by the casing 220 . Specifically, during the injection molding process of the casing 220 , the touch element 210 and the decoration film 230 are fixed on the casing 220 at the same time.

In this embodiment, the touch module 20 is a front cover of a mobile phone. The overall appearance of the housing 220 is arc-shaped. The housing 220 includes an arc-shaped touch area 222, and the touch area 222 is located in the middle of the housing 220, the touch element 210 covers the inner surface of the touch area 222, and the touch area 222 is used for touch The touch element 210 . The touch area 222 is an arc-shaped structure surrounded by two relatively parallel arcs and two relatively parallel straight lines. The material of the housing 220 is transparent PMMA. The touch element 210 is a flexible capacitive touch element, and the touch element 210 is fixed around the touch area 222 on the inner surface of the housing 220 as the shape of the touch area 222 of the housing 220 changes. .

Please refer to FIG. 3 , the decorative film 230 is arranged on the outer surface of the housing 220 , and the part of the decorative film 230 corresponding to the touch area 222 of the housing 220 is transparent, and the other parts of the decorative film 230 It is mainly black and has the phone's brand XXX printed on it. The capacitive touch element 210 includes a PET substrate 212 , a carbon nanotube layer 214 , two first electrodes 216 , two second electrodes 218 and a flexible circuit board 219 . The carbon nanotube layer 214 is attached to the surface of the substrate 212 and covers the touch area 222 , and is used as a transparent conductive layer of the touch element 210 . The two first electrodes 216 and the two second electrodes 218 are separately disposed on the edge of the carbon nanotube layer 214 . The flexible circuit board 219 is electrically connected to the carbon nanotube layer 214 through the two first electrodes 216 and the two second electrodes 218 . Wherein, the two first electrodes 216 and the two second electrodes 218 are made of conductive silver glue, so the two first electrodes 216 and the two second electrodes 218 are also flexible, and can follow the inner shell 220 The shape of the surface changes and bends.

The carbon nanotube layer 214 is a single-layer carbon nanotube film, and the carbon nanotube layer is a self-supporting structure. The carbon nanotube layer 214 includes a plurality of carbon nanotubes that are parallel to each other and have their axes preferentially aligned along the same direction. Most of the carbon nanotubes in the carbon nanotube layer 214 are connected end-to-end along the extending direction of the carbon nanotubes, and the axial direction basically extends in the same preferred direction. Further, the carbon nanotube layer 214 includes a plurality of carbon nanotube bundles preferentially oriented in the same direction, and the carbon nanotube bundles have substantially equal lengths and are arranged end to end to form a continuous carbon nanotube layer.

Since the carbon nanotubes have good electrical conductivity along the axial direction parallel to the carbon nanotubes, and the axial directions of the carbon nanotubes in the carbon nanotube layer 214 basically extend along the same direction, the carbon nanotubes The resistance of the axial direction of the carbon nanotubes in the nanotube layer 214 is much smaller than that of other directions, and this direction is defined as a low resistance direction. In this embodiment, the two first electrodes 216 are arranged perpendicular to the low impedance direction. The resistance of the direction perpendicular to the axial direction of the carbon nanotubes of the carbon nanotube layer 214 is much larger than other directions, so this direction can be further defined as a high resistance direction. In addition, in the carbon nanotube layer 214, among most of the carbon nanotubes extending in the same direction, each carbon nanotube is connected end-to-end with the adjacent carbon nanotubes in the extending direction through van der Waals force, and the carbon nanotubes There are also a small number of randomly arranged carbon nanotubes in the film, and these randomly arranged carbon nanotubes will contact with other adjacent carbon nanotubes, so that the carbon nanotube layer 214 still has electrical conductivity in the direction of high impedance, but only relatively Compared with other directions, the resistance of the carbon nanotube layer in the high impedance direction is larger, and the conductivity is lower. The two second electrodes 218 are arranged perpendicular to the high impedance direction. The two first electrodes 216 and the two second electrodes 218 are formed by printing conductive silver paste on four sides of the carbon nanotube layer 214 .

Please refer to FIG. 4 to FIG. 7, the present invention provides a method for preparing the above-mentioned touch module 20, the method includes the following steps:

(S100) Provide the touch element 210, the decorative film 230 and a mold 100, the mold 100 includes a female mold 110 and a male mold 120; (S200) separate the touch element 210 and the decorative film 230 Fixing the female mold 110 and the male mold 120; (S300) injecting PMMA material into the mold 100 for injection molding to form the mobile phone front cover touch module 20; and (S400) demoulding, from the mold In 100, take out the front cover of the mobile phone.

In step S100 , please refer to FIG. 4 , the specific structure of the mold 100 is related to the required structure of the touch module, and the mold 100 can be manufactured according to the structure of the touch module. The female mold 110 and the male mold 120 are molded together to form a mold cavity 112, and the mold cavity 112 is used for fixing the touch element and the decorative film. Formed on the male mold 120 is an injection port 122 that runs through the male mold 120 for injecting the injection material PMMA to be molded into the mold cavity 112. The injection port 122 is arranged on the edge of the mold cavity 112 to It is ensured that the injection molding of PMMA is formed in the non-touch area of the casing 220, which basically does not affect the conductivity of the carbon nanotube layer. Wherein, the shapes and structures of the female mold 110 and the male mold 120 of the mold 100 match the shapes of the touch element 210 and the decoration film 230 respectively. The mold 100 also includes a first film feeding device (not shown) and a second film feeding device (not shown).

Please refer to FIG. 5, step S200 specifically includes the following steps: use the first film feeding device to pull the decorative film 230, and send the decorative film 230 to the male mold along the parting surface of the male mold 120 120 and the female mold 110, and fixed on the male mold 120, so that the decorative film 230 is attached to the parting surface of the male mold 120; and the second film feeding device is used to pull the touch element 210, And the touch element 210 is sent between the master mold 110 and the male mold 120 along the parting surface of the master mold 110, and fixed on the parting surface of the master mold 110, so that the touch element The PET base 212 of 210 is pasted on the parting surface of the master mold 110 .

Please refer to FIG. 6 . Step S300 specifically includes the following steps: First, combine the male mold 120 and the female mold 110 . Next, PMMA is injected, and the PMMA is injected from the injection port 122 of the male mold 120 until the PMMA fills the mold cavity 112; the decorative film 230 and the touch element 210 attached in the mold cavity 112 adhere to the surface of the PMMA. Then, the injection of PMMA was stopped and cooled.

In the process of merging the female mold 110 and the male mold 120, under the extrusion of the parting surfaces of the female mold 110 and the male mold 120, the PMMA housing 220 of the touch module 20 is adhered to The touch element 210 and the decoration film 230 on both sides are cut off, and separated from the touch element on the second film feeding device and the decoration film on the first film feeding device respectively.

Please refer to FIG. 7 , step S400 is specifically: open the male mold 120 and the female mold 110, and push out the touch module 20 of the front cover of the mobile phone to obtain a decorative film 230 and touch elements attached to the surface respectively. 210 mobile phone front cover.

The carbon nanotube layer 214 of the touch element 210 in the touch module 20 prepared by the above method has not been damaged after high temperature and high pressure, so the relevant performance of the carbon nanotube layer 214 has basically no significant change, such as, The sheet resistance of the carbon nanotube layer 214 has little change before and after the in-mold decoration process, so the electrical conductivity of the carbon nanotube layer 214 has no significant change. The two first electrodes 216 and the two second electrodes 218 are conductive silver paste, which are basically not damaged after the above-mentioned in-mold decoration process, and still have good conductivity. The flexible circuit board 219 is basically not damaged after the above-mentioned in-mold decoration process. Therefore, the touch function of the touch element 210 is basically not affected by the in-mold decoration process, and the touch module 20 has a touch function.

The touch module provided by the embodiment of the present invention and its preparation method have the following advantages: First, the touch module provided by the embodiment of the present invention mainly adopts the method of in-mold injection molding and double coating At the same time as the curved shell, the touch element and the decorative film are fixed on the shell together. Therefore, the preparation method of the touch module is relatively simple, and the film can be pasted on the curved surface, and the product yield is high. Higher, which is conducive to reducing costs. In addition, the method of in-mold injection molding can make the housing curved, the touch element and the decorative film are both flexible elements, the touch element covers the touch area on the curved housing, and the touch The element, the casing and the decorative film are integrally formed, so that the touch element and the decorative film are firmly fixed on the curved casing. Therefore, the touch module can not only be curved, but also have a three-dimensional structure and an aesthetically pleasing Appearance, also has touch function. Second, the touch element is a flexible element, which can be a roll material, and the touch element can be quickly provided to the mold by a roll-to-roll process, thereby further reducing the production cost. Thirdly, after the above-mentioned in-mold decoration molding process, the electrical conductivity of the carbon nanotube layer has basically no significant change, and the performance of other components in the touch element is basically not affected by the in-mold decoration molding process. The impact of the process. Therefore, the touch control element still has a touch control function after the in-mold decoration molding process, so the touch control module has a touch control function, so that the electronic device using the touch control module has a touch control function.

In addition, those skilled in the art can also make other changes within the spirit of the present invention, and these changes made according to the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims (17)

1. A touch module, comprising: a touch element, a housing and a decorative film, characterized in that the housing is curved and has a curved touch area, the touch element covers In the touch area, the shape change trend of the touch element is the same as the shape change trend of the touch area, and the touch area is used to touch the touch element; and the touch element, the casing and the decorative film are integrally formed, the touch area The edge of the touch element is covered by the casing. 2 . The touch module according to claim 1 , wherein the touch element is attached to the decorative film on opposite sides of the housing. 3 . 3. The touch module according to claim 1, wherein the touch element is fixed between the housing and the decoration film. 4. The touch module according to claim 1, wherein the touch element is a capacitive touch element. 5. The touch module according to claim 1, wherein the touch element comprises a carbon nanotube layer and at least two electrodes, the at least two electrodes are electrically connected to the carbon nanotube layer, and The carbon nanotube layer covers the touch area. 6 . The touch module according to claim 5 , wherein the carbon nanotube layer comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes extend along a same direction with preferential orientation. 7. The touch module according to claim 5, wherein the touch element further comprises a flexible substrate, the carbon nanotube layer is disposed on the surface of the flexible substrate, and the flexible substrate is far away from the Decorative film set. 8. The touch module according to claim 7, wherein the touch element further comprises a flexible circuit board, and the flexible circuit board is electrically connected to the at least two electrodes. 9 . The touch module according to claim 1 , wherein the touch element is fixed around the casing close to the touch area. 10. The touch module according to claim 1, wherein the touch area is arc-shaped or stepped. 11. The touch module according to claim 10, wherein the touch element is arc-shaped or stepped. 12. The touch module according to claim 1, wherein the housing is a mobile phone housing, a navigator housing or a steering wheel housing. 13. The touch module according to claim 1, wherein the housing is made of a transparent material, and the part of the decorative film corresponding to the touch area of the housing is transparent. 14. A method for preparing a touch module, comprising the following steps: Provide a touch element, a decorative film and a mold, wherein the touch element is a flexible element, the mold includes a female mold and a male mold, the female mold and the male mold respectively have a parting surface, the parting The mold surface is curved; The touch element and the decorative film are respectively fixed on the parting surfaces of the female mold and the male mold, and the shape change trend of the touch element and the decorative film is the same as that of the parting surface ; Closing the molds, and injecting an injection molding material into the mold for injection molding, so that the injection molding material forms a shell, thereby forming the touch module; and Demoulding, taking out the touch module, the touch element, the casing and the decorative film are integrally formed, and the edge of the touch element is covered by the casing. 15. The manufacturing method of the touch module according to claim 14, wherein the mold further comprises a first film feeding device, and the male mold has a male mold parting surface, wherein the decorative film The step of fixing into the male mold is: the decorative film is sent to a selected area of the male mold parting surface along the male mold parting surface under the traction of the first film feeding device; and The decorative film is fixed on the parting surface of the male mold. 16. The manufacturing method of the touch module according to claim 15, wherein the mold further comprises a second film feeding device, the master mold has a mold parting surface, and the mold parting surface Set opposite to the parting surface of the male mold, wherein the step of fixing the touch element into the master mold is: the touch element is pulled along the mother mold under the traction of the second film feeding device. The mold parting surface is sent to the selected area of the female mold parting surface; and the touch element is fixed on the female mold parting surface. 17. The manufacturing method of the touch module according to claim 14, wherein the step of closing the mold and injecting an injection molding material into the mold for injection molding comprises: merging the master mold and The male mold forms a mold cavity; the injection molding material is filled in the mold cavity until the injection molding material completely fills the mold cavity, the decorative film fixed on the male mold and the The touch element on the master mold is adhered to the surface of the injection molding material at the same time; and cooling, so that the injection molding material forms a shell with a touch area, thereby forming a touch element integrally molded with the touch element, the shell, and the decorative film. control module.