CN112860093A - Flexible folding touch sensor and manufacturing method thereof - Google Patents
Flexible folding touch sensor and manufacturing method thereof Download PDFInfo
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- CN112860093A CN112860093A CN201911192101.2A CN201911192101A CN112860093A CN 112860093 A CN112860093 A CN 112860093A CN 201911192101 A CN201911192101 A CN 201911192101A CN 112860093 A CN112860093 A CN 112860093A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- G—PHYSICS
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Abstract
The invention relates to the field of sensors, in particular to a flexible folding touch sensor and a manufacturing method thereof. The touch sensor comprises a transparent polyimide base film and nano-silver conducting layers coated and solidified on two sides of the base film, wherein etching patterns and etching electrode leads are arranged on the nano-silver conducting layers. According to the flexible folding touch sensor, a single-layer double-sided conductive film and a silver paste-free pure nano silver process are adopted, compared with the traditional touch sensor, an optical adhesive layer which plays a bonding role in the double-layer conductive film is removed, meanwhile, the electrode lead is directly obtained by etching nano silver, the conventional silver paste electrode lead is replaced, the thickness of the touch sensor is reduced, and the problem that the traditional silver paste lead is fragile and cannot be bent is solved. According to the invention, the transparent polyimide with excellent bending resistance and flexibility is used as a base film material, and the nano-silver pattern and the nano-silver electrode lead are combined, so that the bending resistance of the touch sensor is greatly improved.
Description
Technical Field
The invention relates to the field of sensors, in particular to a flexible folding touch sensor and a manufacturing method thereof.
Background
As the mobile intelligent terminal develops to a bottleneck stage, innovation begins to be soft, the screen is fully adjusted only by a small amount, the difference between a new product and an old product is not large, the change tide is difficult to cause, the experience upgrading of the mobile terminal reaches a peak value, and a consumer enters a consumption fatigue period. Greater innovation is needed if the user's desire to change machines is to be re-motivated, and flexible oled may drive the terminal industry revolutionarily. The flexible oled is likely to enable the mobile phone and the notebook computer to be integrated, the folding screen intelligent device is combined to be the mobile phone with the small screen, the folding screen intelligent device is unfolded to be the notebook computer with the large screen, and the mobile phone, the tablet and the notebook computer are completely likely to achieve the three-in-one function along with the breakthrough of the flexible display technology and the evolution of products. The touch screen is required to be used in the form of a mobile phone, a conventional mutual-capacitive multipoint touch screen adopts a film-film-glass structure, patterns are etched on an Indium Tin Oxide (ITO) conducting film, metal silver paste electrode leads are printed on the edges of the ITO conducting film to reach a touch chip, the Indium Tin Oxide (ITO) and silver paste electrode leads are not resistant to bending, the ITO conducting film and the silver paste electrode leads are easy to brittle after bending, the impedance value of the ITO conducting film and the silver paste electrode leads is rapidly increased, the impedance stability of the ITO conducting film and the silver paste electrode leads is worse, and the touch screen is easy to break due to the fact; the sensor adopts upper and lower conducting film to paste together with OCA optical cement, and its processing procedure is various, and product thickness is relatively thicker, and after repeated folding, has increased OCA optical cement and upper and lower layer conducting film's separation risk.
Chinese patent with publication number CN202995694U discloses a capacitance winding touch screen, which comprises a screen and a cover, wherein the screen comprises a first polymer substrate layer and a second polymer substrate layer, the first polymer substrate layer and the second polymer substrate layer are bonded together through an optical adhesive layer, the surface of the first polymer substrate layer is provided with a first nano metal polymer layer, and the surface of the second polymer substrate layer is provided with a second nano metal polymer layer. The thickness of the capacitive touch screen is thicker due to the complex structure of the capacitive touch screen, and the bending and folding capabilities of the capacitive touch screen are limited.
Disclosure of Invention
In view of the above technical problems, the present invention provides a flexible foldable touch sensor and a manufacturing method thereof, which can ensure that the touch sensor still has a good touch effect after tens of thousands of foldable touch sensors are folded.
The invention adopts the following technical scheme:
a flexible folding touch sensor comprises a transparent polyimide base film and nano-silver conducting layers coated and solidified on two sides of the base film, wherein etching patterns and etching electrode leads are arranged on the nano-silver conducting layers.
Furthermore, the thickness of the touch sensor is less than or equal to 23 um.
Furthermore, the thickness of the base film is less than or equal to 23um, the thickness of the nano silver conducting layer is 100-120nm, and the square resistance of the nano silver conducting layer is 5-30 omega/grid.
Further, the touch sensor is folded for 30 ten thousand times at a bending radius of 2mm and a frequency of bending 180 degrees every 1.3s, and the resistance change rate is less than 10%.
The invention also provides a method for preparing the flexible folding touch sensor, which comprises the following steps:
(1) coating nano silver ink on the two sides of the base film to prepare a nano silver conductive film;
(2) and (3) performing laser etching on the pattern and the nano silver electrode lead on the nano silver conductive film to obtain the touch sensor.
Further, the laser etching process adopts an ultraviolet picosecond laser machine.
Furthermore, the output power of the ultraviolet picosecond laser machine is 0.4-0.6W, and the laser frequency is 500-1500 KHz.
Furthermore, the diameter of the nano silver wire in the nano silver ink is 18-22nm, and the length is 20-30 um.
Furthermore, the base film and the nano silver conductive film are arranged on a bearing film in the preparation process, the bearing film is polyethylene terephthalate, and the thickness of the bearing film is more than or equal to 80 um.
The invention also provides touch equipment comprising the touch sensor.
According to the flexible folding touch sensor, a single-layer double-sided conductive film and a silver paste-free pure nano silver process are adopted, compared with the traditional touch sensor, an optical adhesive layer which plays a bonding role in the double-layer conductive film is removed, meanwhile, the electrode lead is directly obtained by etching nano silver, the conventional silver paste electrode lead is replaced, the thickness of the touch sensor is reduced, and the problem that the traditional silver paste lead is fragile and cannot be bent is solved. According to the invention, the transparent polyimide with excellent bending resistance and flexibility is used as a base film material, and the nano-silver pattern and the nano-silver electrode lead are combined, so that the bending resistance of the touch sensor is greatly improved. The touch sensor has stable channel impedance, the resistance change rate is less than 10%, and the appearance effect and the touch effect are good under the conditions that the touch sensor is bent for 30 ten thousand times at the bending radius of 2mm and is bent for 180 degrees every 1.3 s.
According to the manufacturing method of the flexible folding touch sensor, the nano silver conducting layers are coated on the two sides of the base film, so that the application of an OCA optical adhesive layer is omitted, patterns and electrode leads are etched on the double-side conducting film by adopting a laser etching process, silver paste wiring is not needed, the manufacturing process is simplified, and the efficiency is improved.
According to the manufacturing method of the flexible folding touch sensor, the ultraviolet picosecond laser machine is adopted for etching to replace the traditional infrared fiber laser, the output power and the laser frequency of the infrared fiber laser are limited, so that the conductive layer on the other surface cannot be influenced in the double-sided laser etching process, and the feasibility of laser etching on a single-layer double-sided conductive film is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a flexible folding touch sensor according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A flexible folding touch sensor comprises a transparent polyimide base film and nano-silver conducting layers coated and solidified on two sides of the base film, wherein etching patterns and etching electrode leads are arranged on the nano-silver conducting layers.
According to the flexible folding touch sensor, a single-layer double-sided conductive film and a silver paste-free pure nano silver process are adopted, and compared with the traditional touch sensor, an optical adhesive layer with a bonding effect in a double-layer conductive film is removed, the thickness of the touch sensor is reduced, and the risk of separation of an OCA optical adhesive and the conductive film in the folding process is effectively avoided; meanwhile, the nano silver wire is used for replacing indium tin oxide, and the excellent light transmittance and bending resistance of the nano silver wire are utilized to form a nano silver wire conductive film and etch patterns and electrode leads, so that the problem that the indium tin oxide is easily broken when being repeatedly folded is solved, the conventional silver paste electrode lead is replaced, and the problems that the thickness of a product is increased after the silver paste is solidified and the silver paste is easily brittle and cannot be bent are solved; on the other hand, transparent polyimide is used as a base film material, and the excellent bending resistance is fully utilized.
The invention provides a single-layer double-sided conductive film touch sensor free of silver paste electrode leads and of a pure nano silver line structure, which effectively solves the problems that Indium Tin Oxide (ITO) and silver paste electrode leads are not bent and are easy to break and OCA and a conductive film are separated, so that the touch sensor provided by the invention has excellent folding performance and meets the requirements of a foldable smart phone, a flexible electronic device and the like.
Specifically, in some embodiments of the present invention, the thickness of the touch sensor is less than or equal to 23 um.
Specifically, in some embodiments of the present invention, the base film has a thickness ≦ 23um, and preferably, the base film has a thickness of 10-23 um; the thickness of the nano silver conducting layer is 100-120nm, and the square resistance of the nano silver conducting layer is 5-30 omega/lattice. The invention selects transparent polyimide (CPI) as a base film, has the excellent performance of the traditional PI, has the characteristics of high heat resistance, high reliability, flexing resistance, low density, low dielectric constant, easy realization of micro-pattern circuit processing and the like, and overcomes the defect of light yellow or deep yellow color of the traditional PI film. The nano silver conductive layer has excellent light transmission and bending resistance, and provides possibility for realizing flexibility, a bendable display screen, a touch screen and the like. The invention coats nano silver ink on the two sides of the transparent polyimide base film to prepare the nano silver conductive film, has high heat resistance, high transmittance, bending resistance and high deformation amount, can not generate plastic deformation after repeated folding, and has stable impedance.
The invention also provides a method for preparing the flexible folding touch sensor, which comprises the following steps:
(1) coating nano silver ink on the two sides of the base film to prepare a nano silver conductive film;
(2) and (3) performing laser etching on the pattern and the nano silver electrode lead on the nano silver conductive film to obtain the touch sensor.
According to the invention, the nano silver conductive layers are coated on the two sides of the base film, so that the application of an OCA optical adhesive layer is omitted, patterns and electrode leads are etched on the double-sided conductive film by adopting a laser etching process, silver paste wiring is not required, the process procedure is simplified, and the efficiency is improved.
Because most touch screens in the current market need to screen print silver paste electrode leads to a touch chip at the edge due to high sheet resistance of a conductive material, but the thickness of the solidified silver paste is 4-6um, the product thickness is increased, and meanwhile, the silver paste is brittle and cannot resist bending.
Specifically, in some embodiments of the present invention, the laser etching process employs an ultraviolet picosecond laser. The traditional laser etching mostly adopts an infrared fiber laser, but when the infrared fiber laser is used for carrying out double-sided laser etching on a flexible base film, laser penetrates through the film to the other side to damage a conducting layer on the other side, and the structure of the conducting layer on the other side is damaged. The ultraviolet picosecond laser machine selected by the invention has the characteristics of low absorption rate, narrow pulse width and low power, the surface precision of the ultraviolet picosecond laser etching material can be controlled within 1UJ through low power and low pulse, the typical value of the surface thickness of the material melted by each laser pulse is 10-100nm under the condition, and the ultraviolet picosecond laser etching material cannot penetrate through the conductive layer on the back of the material under the thickness of the conductive layer and the base film of the ultraviolet picosecond laser etching material, so that the ultraviolet picosecond laser etching material is beneficial to realizing the laser etching process of a single-layer double-sided.
More specifically, the output power of the ultraviolet picosecond laser machine is 0.4-0.6W, the wavelength is 355nm, the pulse width is less than 10PS, the laser frequency is 500-1500KHz, the scanning speed is 2000-6000mm/s, and the scanning times are 1-3.
Specifically, in some embodiments of the present invention, the nano-silver wires in the nano-silver ink have a diameter of 18-22nm and a length of 20-30 um.
Specifically, in some embodiments of the present invention, the base film and the nano silver conductive film are disposed on a carrier film, the carrier film is polyethylene terephthalate, and the thickness of the carrier film is greater than or equal to 80 μm. The carrier film serves to protect the circuit and to support the conductive film material for processing, for example, in the laser etching process, the carrier film is attached to the conductive layer with the etched pattern and the lead, and then the pattern and the lead on the other side are laser etched.
According to the touch sensor, the overall thickness is controlled within 23 μm, a single-layer double-conductive-surface silver paste-free pure nano silver process is adopted, compared with the existing touch sensor, an OCA (optical clear adhesive) layer and a silver paste lead wire are removed, the thickness of the sensor is obviously reduced, the sensor is thinner and more flexible, and the light transmittance of a product is improved. The touch sensor is folded for 30 ten thousand times at the bending radius of 2mm and the frequency of bending 180 degrees every 1.3s, and the resistance change rate is less than 10 percent.
The invention also provides touch equipment comprising the touch sensor.
The flexible folding touch sensor and the manufacturing method thereof according to the present invention are described in detail above, and will be further described with reference to specific embodiments.
Example 1
A touch sensor is prepared by the following method:
(1) coating nano silver ink on two sides of a 13-micron-thick transparent polyimide base film, and curing to obtain a nano silver conductive film, wherein the thicknesses of the nano silver conductive layers on the two sides are respectively 100nm, and the square resistance of the nano silver conductive layer is 30 omega/grid;
(2) and (3) performing laser etching on the pattern and the nano-silver electrode lead on the nano-silver conductive film by adopting an ultraviolet picosecond laser machine to obtain the touch sensor.
The set output power of the ultraviolet picosecond laser machine is 0.45W, the laser frequency is 800KHz, and the scanning speed is 4500 mm/s.
Example 2
A touch sensor is prepared by the following method:
(1) coating nano silver ink on two sides of a transparent polyimide base film with the thickness of 20 mu m, and curing to obtain a nano silver conductive film, wherein the thickness of the nano silver conductive layers on the two sides is 105nm respectively, and the square resistance of the nano silver conductive layer is 20 omega/grid;
(2) and (3) performing laser etching on the pattern and the nano-silver electrode lead on the nano-silver conductive film by adopting an ultraviolet picosecond laser machine to obtain the touch sensor.
The set output power of the ultraviolet picosecond laser machine is 0.5W, the laser frequency is 1000KHz, and the scanning speed is 5000 mm/s.
Example 3
A touch sensor is prepared by the following method:
(1) coating nano silver ink on two sides of a transparent polyimide base film with the thickness of 23 mu m, and curing to obtain a nano silver conductive film, wherein the thickness of the nano silver conductive layers on the two sides is 110nm respectively, and the square resistance of the nano silver conductive layer is 10 omega/grid;
(2) and (3) performing laser etching on the pattern and the nano-silver electrode lead on the nano-silver conductive film by adopting an ultraviolet picosecond laser machine to obtain the touch sensor.
The set output power of the ultraviolet picosecond laser machine is 0.55W, the laser frequency is 1200KHz, and the scanning speed is 5500 mm/s.
Comparative example 1
A touch sensor is prepared by the following method:
(1) coating nano silver ink on two sides of a transparent polyimide base film with the thickness of 23 mu m, and curing to obtain a nano silver conductive film, wherein the thickness of the nano silver conductive layers on the two sides is 110nm respectively;
(2) and (3) performing laser etching on the nano-silver conductive film by adopting an ultraviolet picosecond laser machine, and printing silver paste on the edge of the pattern to prepare an electrode lead to obtain the touch sensor.
Comparative example 2
A touch sensor is prepared by the following method:
(1) coating nano silver ink on a transparent polyimide base film with the thickness of 23um to prepare a first nano silver conductive film, wherein the thickness of the nano silver conductive film is 110 nm; etching patterns and a nano-silver electrode lead on the first nano-silver conductive film by adopting an ultraviolet picosecond laser machine;
(2) coating nano-silver ink on a transparent polyimide base film with the thickness of 23 mu m to prepare a second nano-silver conductive film, wherein the thickness of the nano-silver conductive film is 110nm, and performing laser etching on a pattern and a nano-silver electrode lead on the second nano-silver conductive film by adopting an ultraviolet picosecond laser machine;
(3) and then adhering the first nano silver conductive film and the second nano silver conductive film together by using OCA (optical clear adhesive) with the thickness of 50um to obtain the touch sensor.
Comparative example 3
A touch sensor is prepared by the following method:
(1) coating nano silver ink on two sides of a transparent polyimide base film with the thickness of 23 mu m, and curing to obtain a nano silver conductive film, wherein the thickness of the nano silver conductive layers on the two sides is 110nm respectively;
(2) and (3) performing laser etching on the pattern and the nano-silver electrode lead on the nano-silver conductive film by adopting an infrared fiber laser to obtain the touch sensor.
Comparative example 4
A touch sensor is prepared by the following method:
(1) coating nano silver ink on two sides of a polyethylene terephthalate (PET) base film with the thickness of 23um, and curing to obtain a nano silver conductive film, wherein the thickness of the nano silver conductive layers on the two sides is 110nm respectively;
(2) and (3) performing laser etching on the pattern and the nano-silver electrode lead on the nano-silver conductive film by adopting an ultraviolet picosecond laser machine to obtain the touch sensor.
Bending performance tests are performed on the touch sensors prepared in the embodiments 1 to 3 and the comparative examples 1 to 4 of the present invention, and the specific experimental processes are as follows:
the touch module prepared in each embodiment and the comparative example is tested by using an XHS-ZW-03A model repeated bender manufactured by Shenzhen Xinhensen instruments Limited, and the test conditions are as follows: one end of a module to be tested is clamped by a clamping plate, one end of the clamping plate is a semicircular angle with the radius of 2mm, the other end of the clamping plate is clamped on a crank shaft, the module is repeatedly bent under the driving of a motor, and the bending frequency is once every 1.3 seconds. And recording the bending times, the resistance change rate and the appearance effect or failure reasons of different touch sensors. The results are shown in Table 1.
TABLE 1 bending contrast test results of different touch sensors
As can be seen from table 1, the single-layer double-sided conductive film touch sensor with a pure nano silver wire structure and without a silver paste electrode lead provided by the invention removes an OCA glue layer, and selects a transparent polyimide base film and a silver nano wire as a conductive layer, so that the problems that an Indium Tin Oxide (ITO) and a silver paste electrode lead are not resistant to bending and are easy to break and the OCA and the conductive film are separated are effectively solved.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (10)
1. The flexible folding touch sensor is characterized by comprising a transparent polyimide base film and nano-silver conducting layers coated and solidified on two sides of the base film, wherein etching patterns and etching electrode leads are arranged on the nano-silver conducting layers.
2. The flexible folding touch sensor of claim 1, wherein the touch sensor has a thickness of 23um or less.
3. The flexible folding touch sensor according to claim 1, wherein the thickness of the base film is not greater than 23 μm, the thickness of the nano-silver conductive layer is 100-120nm, and the sheet resistance of the nano-silver conductive layer is 5-30 Ω/grid.
4. The flexible folding touch sensor of claim 1, wherein the touch sensor folds 30 million times at a frequency of 180 ° per 1.3s at a 2mm bend radius with a rate of change of resistance of less than 10%.
5. A method of making the flexible, folding touch sensor of any of claims 1-4, comprising the steps of:
(1) coating nano silver ink on the two sides of the base film to prepare a nano silver conductive film;
(2) and (3) performing laser etching on the pattern and the nano silver electrode lead on the nano silver conductive film to obtain the touch sensor.
6. The method of claim 5, wherein the laser etching process uses an ultraviolet picosecond laser.
7. The method as claimed in claim 6, wherein the output power of the UV picosecond laser machine is 0.4W to 0.6W, and the laser frequency is 500KHz to 1500 KHz.
8. The method of claim 5, wherein the diameter of the silver nanowires in the silver ink is 18-22nm, and the length of the silver nanowires is 20-30 um.
9. The manufacturing method of the flexible folding touch sensor according to claim 5, wherein the base film and the nano silver conductive film are placed on a carrier film in a preparation process, the carrier film is polyethylene terephthalate, and the thickness of the carrier film is greater than or equal to 80 μm.
10. A touch device comprising the touch sensor of any one of claims 1-4.
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| CN201911192101.2A CN112860093A (en) | 2019-11-28 | 2019-11-28 | Flexible folding touch sensor and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114767105A (en) * | 2022-06-22 | 2022-07-22 | 苏州百孝医疗科技有限公司 | Implantable electrochemical biosensor, testing method and implantable medical device |
| CN114835899A (en) * | 2022-05-31 | 2022-08-02 | 深圳市华科创智技术有限公司 | High-temperature-resistant shape memory transparent polyimide film and shape memory electrode prepared from same |
-
2019
- 2019-11-28 CN CN201911192101.2A patent/CN112860093A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114835899A (en) * | 2022-05-31 | 2022-08-02 | 深圳市华科创智技术有限公司 | High-temperature-resistant shape memory transparent polyimide film and shape memory electrode prepared from same |
| CN114767105A (en) * | 2022-06-22 | 2022-07-22 | 苏州百孝医疗科技有限公司 | Implantable electrochemical biosensor, testing method and implantable medical device |
| CN114767105B (en) * | 2022-06-22 | 2022-10-14 | 苏州百孝医疗科技有限公司 | Implantable electrochemical biosensor, testing method and implantable medical device |
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