CN103324374A - Capacitive touch screen manufacturing method and capacitive touch screen - Google Patents
Capacitive touch screen manufacturing method and capacitive touch screen Download PDFInfo
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- CN103324374A CN103324374A CN2013102403619A CN201310240361A CN103324374A CN 103324374 A CN103324374 A CN 103324374A CN 2013102403619 A CN2013102403619 A CN 2013102403619A CN 201310240361 A CN201310240361 A CN 201310240361A CN 103324374 A CN103324374 A CN 103324374A
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 9
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Abstract
The invention relates to touch screen technologies and discloses a capacitive touch screen manufacturing method and a capacitive touch screen. According to frame patterns required by the appearance of the touch screen, insulation ink covers a panel substrate to form frame patterns outside a window of the touch screen, and a sensor circuit for detecting a touch position is printed on a transparent conductive coating; meanwhile, conductive ink covers the insulation ink and the transparent conductive coating, the transparent conductive coating extends to the back side of the insulation ink to perform circuit processing outside the window. Therefore, a capacitive touch screen manufacturing process is simple, the production cost is low, the production efficiency is improved, and the actual situations of small and medium-sized enterprises and large-scale production requirements are met.
Description
Technical Field
The invention relates to a touch screen technology, in particular to a capacitive touch screen.
Background
The capacitive touch screen is used as a brand-new computer input device and is mainly used for man-machine conversation operations such as information inquiry, industrial control, military command, multimedia teaching and the like.
In a conventional projected capacitive touch screen on the market, a process flow of a circuit on a glass substrate is generally as follows: firstly, coating photoresist on the surface of indium tin oxide GLASS (ITO GLASS) 102 plated with molybdenum, aluminum and molybdenum, then covering the part which is not required to be reserved by a film 101, exposing 104 for development, curing the photoresist on the part which is not covered by the film 101 as shown in figure 1, removing the photoresist on the part which is covered by the film 101 and is not exposed, then deplating the molybdenum, aluminum and molybdenum 102, finally removing the photoresist which is not covered by the film 101, and cleaning to leave the required circuit on the surface of the ITO GLASS.
However, the yellow light process has complex manufacturing process, very high requirements on environment and equipment and higher production cost; if the circuit design scheme is changed, a photomask (Mask) for photoetching also needs to be redesigned, so that the production cost is greatly increased; and the manufacturing process has many steps, which severely limits the production yield.
In addition, when the Indium Tin Oxide (ITO) 102 layer is plated, a part is generally plated on the base material 202 and a part is plated on the insulating panel 201, and there is a height difference at the connection, as shown in fig. 2, so that a fault occurs at the connection, and an open circuit of a line is generated, resulting in a touch failure.
Disclosure of Invention
The invention aims to provide a manufacturing method of a capacitive touch screen and the capacitive touch screen, so that the manufacturing process of the capacitive touch screen is simpler, the production cost is relatively low, the production efficiency is improved, and the actual conditions and the large-batch production requirements of small and medium-sized enterprises are met better.
In order to solve the technical problem, the invention provides a method for manufacturing a capacitive touch screen, which comprises the following steps:
A. providing a panel substrate with a transparent conductive coating;
B. covering insulating ink on the panel substrate according to a frame pattern required by the appearance of the touch screen to form a frame pattern outside a window of the touch screen, and printing a sensor circuit for detecting a touch position on the transparent conductive coating;
C. and covering the insulating ink and the transparent conductive coating with conductive ink, and extending the transparent conductive coating to the back of the insulating ink for circuit treatment outside the window.
The present invention also provides a capacitive touch screen, comprising: a panel substrate with a transparent conductive coating; it is characterized in that the adhesive is characterized in that,
the panel substrate is covered with a frame pattern outside a touch screen window formed by insulating ink, and a sensor circuit for detecting a touch position is printed on the transparent conductive coating;
the panel substrate further comprises: and the conductive ink covers the insulating ink and the transparent conductive coating, and the transparent conductive coating extends to the back of the insulating ink through the conductive ink and is used for circuit treatment outside the window.
Compared with the prior art, according to the frame pattern required by the appearance of the touch screen, the embodiment of the invention covers the insulating ink on the panel substrate to form the frame pattern outside the window of the touch screen, and prints a sensor circuit for detecting the touch position on the transparent conductive coating; and covering the insulating ink and the transparent conductive coating with conductive ink, and extending the transparent conductive coating to the back of the insulating ink for circuit treatment outside the window. Compared with the existing yellow light process, touch screen manufacturers can omit complex photoetching equipment and expensive masks (masks), so that the manufacturing process of the capacitive touch screen is simpler, the production cost is relatively low, the production efficiency is improved, and the capacitive touch screen better meets the actual conditions and mass production requirements of small and medium-sized enterprises.
In addition, holes can be reserved in the insulating ink, and the insulating ink with the holes is covered on the panel substrate to form a frame pattern outside the window of the touch screen; and printing the conductive ink on the part of the reserved hole, and extending the transparent conductive coating to the back surface of the insulating ink for circuit treatment outside the window. Or, the whole conductive ink can be printed on the edge of the window, and the transparent conductive coating extends to the back of the insulating ink for circuit processing outside the window. The implementation mode of the invention can be flexibly and changeably realized, the technical difficulty that the transparent conductive coating extends to the back surface of the insulating ink is overcome, the climbing phenomenon (namely the height difference at the connection part) of the ITO layer in the figure 2 is avoided, and the touch performance of the touch screen is effectively improved. Moreover, the price of the conductive ink is low, and the printing technology is quite mature, so that the mode of extending the transparent conductive coating to the back surface of the insulating ink by printing the conductive ink for circuit processing outside the window is mature in technology, low in cost and beneficial to mass production.
In addition, printing the whole strip of conductive ink on the edge of the window, extending the transparent conductive coating to the back of the insulating ink, and covering the insulating ink on the whole strip of conductive ink in the scheme for processing the circuit outside the window; wherein the insulating ink covering the whole strip of conductive ink overlaps the position of the insulating ink covered by the whole strip of conductive ink. The whole conductive ink is covered with the insulating ink, so that the color of a frame outside a window of the touch screen can be kept consistent, the appearance is attractive, the whole conductive ink can be protected and isolated, and the phenomena of abrasion and short circuit are prevented.
In addition, the conductive ink is transparent conductive ink; or the conductive ink is the same color as the insulating ink. Transparent conductive ink or conductive ink with the same color as the insulating ink is adopted, so that the color of a frame outside a window of the touch screen is kept consistent, and the appearance of the touch panel is attractive. For example, if the conductive ink having the same color as the insulating ink is used for the frame pattern outside the window of the touch panel having the hole in the insulating ink, the space left in the insulating ink is not visible in appearance.
In addition, the transparent conductive coating is any one of an Indium Tin Oxide (ITO) film, a carbon nanotube film or a nano silver film. The conductive materials are common conductive materials for producing electronic products, have stable performance and rich varieties, enable touch screen manufacturers to have more choices, and are beneficial to controlling cost and popularizing technology.
In addition, the panel base material is any one of the following materials: polycarbonate PC panels, polyethylene terephthalate PET panels, GLASS panels. The materials can be used as panel materials, so that manufacturers of capacitive touch screens can freely select panel substrates according to needs, the application range of the technology for printing the conductive circuits on the panel substrates is wide, and popularization and application are facilitated.
Drawings
FIG. 1 is a schematic illustration of exposure and development in a process for manufacturing a capacitive touch screen according to the prior art;
FIG. 2 is a schematic structural diagram of a joint between a substrate and an insulating panel in a manufacturing process of a capacitive touch panel according to the prior art;
FIG. 3 is a flow chart of a method of manufacturing a capacitive touch screen according to a first embodiment of the present invention;
FIG. 4 is a schematic illustration of a hole in an insulating ink according to a first embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a hole in an insulating ink according to a first embodiment of the present invention;
FIG. 6 is a schematic side view of a first embodiment of the present invention in which conductive ink is printed at the locations of the holes;
fig. 7 is a schematic view of printing a whole strip of conductive ink on the edge of a window according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
The first embodiment of the invention relates to a method for manufacturing a capacitive touch screen. The specific flow is shown in fig. 3.
In step 310, a panel substrate with a transparent conductive coating is provided. Specifically, the panel base material may be any one of a polycarbonate PC panel, a polyethylene terephthalate PET panel, and a GLASS panel. The transparent conductive coating can also be any one of an Indium Tin Oxide (ITO) film, a carbon nanotube film or a nano silver film. For example, a GLASS panel with an ITO film, or a PET panel with a carbon nanotube film, etc. is provided. Of course, in practical applications, other materials can be used for the panel substrate or the transparent conductive coating, which is not exemplified here.
Next, in step 320, according to a frame pattern required by the appearance of the touch screen, the insulating ink is covered on the panel substrate to form a frame pattern outside the window of the touch screen. Specifically, one method is to print or sputter insulating ink (the insulating ink has photosensitive glue) on the panel substrate, cover the part which is not needed to be reserved with a film, and perform illumination, wherein the illumination is to solidify the insulating ink and wash off the insulating ink covered by the film to obtain a frame pattern required by the appearance of the touch screen. Another method is to print insulating ink directly on the panel to form the required border pattern outside the touch screen window, i.e. print insulating ink only on the portion of the panel where the border pattern is to be formed.
It should be noted that in this step, a hole needs to be formed in the insulating ink, and the effect schematic diagram is shown in fig. 4, where reference numeral 402 in fig. 4 is the insulating ink forming the border pattern, reference numeral 401 is the hole formed in the insulating ink, and reference numeral 403 is the window of the touch screen. The cross-sectional view is shown in fig. 5, 501 is a panel substrate, and 502 is a transparent conductive coating on the panel substrate. The insulating ink 402 with the holes is coated on the panel substrate, and is mainly used for the subsequent extending treatment of the transparent conductive coating 502 (the subsequent extending treatment of the transparent conductive coating 502 will be described in detail later).
It should be noted that, in this embodiment, the fact that the hole is formed in the insulating ink 402 is a concept of leaving a space in the insulating ink 402, that is, the transparent conductive coating 502 on the panel substrate is exposed through the hole 401 formed in the insulating ink 402 at the position of the frame outside the touch screen window 403, so as to facilitate the extending process of the transparent conductive coating 502. Of course, in practical applications, the shape of the hole 401 may be circular, square, triangular, etc., and the shape of the hole 401 may be selected according to the requirements of the practical process.
Next, in step 330, a sensor circuit for detecting a touch position is printed on the transparent conductive coating. Specifically, in this embodiment, an indium tin oxide ITO film is used as an example of the transparent conductive coating layer. Specifically, acid-resistant ink having a wiring structure is printed on the entire screen, and then the screen is washed with acid solution, and the ITO layer not covered with the portion is washed away, thereby etching to form a desired ITO wiring. Or, if the required precision requirement is higher, the unnecessary part on the ITO layer can be knocked off by adopting a laser mode to form the required ITO circuit. Of course, in practical application, the transparent conductive coating may also be made of other transparent conductive materials such as a carbon nanotube film or a nano silver film, which are not described herein again.
In addition, it is worth mentioning that step 320 and step 330 have no absolute precedence relationship, that is, the printing of the sensor circuit in step 330 may be performed first, and then the forming of the border pattern outside the window of the touch screen in step 320 may be performed.
In step 340, the insulating ink and the transparent conductive coating are covered with conductive ink at the same time, and the transparent conductive coating is extended to the back of the insulating ink for circuit processing outside the window. Specifically, as shown in fig. 6, the conductive ink 601 is printed on the insulating ink 402 at the position of the hole, and the transparent conductive coating is extended to the back of the insulating ink for circuit processing outside the window. In the embodiment, the conductive ink 601 printed at the position of the reserved hole is the same color as the insulating ink 402, so that the part of the reserved hole is prevented from being seen from the appearance, the consistency of the color and the structure of the frame outside the window of the touch screen is kept, and the appearance effect of the touch panel is ensured. That is, if the insulating ink is black insulating ink, the conductive ink is also black conductive ink, for example, carbon paste is used as the conductive ink, and the black conductive ink is printed on the position of the hole of the insulating ink, so that the transparent conductive coating 502 extends to the back of the insulating ink 402 for circuit processing outside the window 403. The circuit on the transparent conductive coating extending to the back of the insulating ink 402 is connected with the mobile phone motherboard through an FPC (flexible circuit board), and when a user's finger touches a touch area in the window, the position information of the contact is detected by the sensor circuit on the transparent conductive coating, and the position information of the contact is output to the mobile phone motherboard through the conductive ink and the FPC.
Compared with the existing yellow light process, the method has the advantages that a touch screen manufacturer can omit complicated photoetching equipment and replacement of an expensive Mask (Mask), and the printing technology adopted by the method is simple in equipment and mature in process, so that the production cost is greatly saved for the touch screen manufacturer, and the method better meets the actual conditions of small and medium-scale enterprises and the requirements of mass production. And moreover, the transparent conductive coating in the window is skillfully extended to the back surface of the insulating ink by a mode of reserving holes on the insulating ink, so that the method is simple to realize, low in cost and beneficial to large-batch production. Moreover, the phenomenon of climbing (namely, the height difference at the joint) of the ITO layer in the figure 2 is avoided, so that the touch performance of the touch screen is effectively improved.
In this embodiment, the transparent conductive coating layer is any one of an indium tin oxide ITO thin film, a carbon nanotube thin film, and a nano silver thin film. The conductive materials are common conductive materials for producing electronic products, and have stable performance and rich varieties. In addition, the panel base material may be any one of the following materials: polycarbonate PC panels, polyethylene terephthalate PET panels, GLASS panels. The capacitive touch screen can be freely selected by manufacturers according to needs, and control cost and technical popularization are facilitated.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the steps contain the same logical relationship, which is within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
A second embodiment of the present invention relates to a method for manufacturing a capacitive touch panel, and the present embodiment is substantially the same as the first embodiment, and is mainly different in that in the first embodiment, a conductive ink is printed on a hole-reserved portion of an insulating ink, and a transparent conductive coating layer is extended to the back surface of the insulating ink for circuit processing outside a window. In the second embodiment of the invention, the transparent conductive coating is extended to the back of the insulating ink by printing the whole strip of conductive ink on the edge of the window for circuit treatment outside the window.
Specifically, as shown in fig. 7, the entire strip of conductive ink 701 is printed on the transparent conductive coating at the edge of the touch screen window 403, and the transparent conductive coating is extended to the back of the insulating ink. That is, the entire strip of conductive ink 701 partially overlies the transparent conductive coating in the window and partially overlies the insulating ink that forms the border pattern outside of the touch screen window 403.
In addition, it is worth mentioning that a layer of insulating ink can be covered on the whole conductive ink; wherein the insulating ink overlying the entire strip of conductive ink overlaps the location of the insulating ink covered by the entire strip of conductive ink. The whole conductive ink is covered with the insulating ink, so that the color of a frame outside a window of the touch screen can be kept consistent, the appearance is attractive, the whole conductive ink can be protected and isolated, and the phenomena of abrasion and short circuit are prevented. In this embodiment, the entire printed conductive ink is a transparent conductive ink. The integrity of the touch screen window and border patterns and the aesthetics of the touch screen window and border patterns can be maintained by using the transparent conductive ink.
A third embodiment of the present invention relates to a capacitive touch panel including: the panel substrate is covered with a frame pattern outside a touch screen window formed by insulating ink, and a sensor circuit for detecting a touch position is printed on the transparent conductive coating.
The panel substrate further comprises: and the conductive ink covers the insulating ink and the transparent conductive coating, and the transparent conductive coating extends to the back of the insulating ink through the conductive ink and is used for circuit treatment outside the window.
In this embodiment, the insulating ink has a hole, the conductive ink covers the hole of the insulating ink, and the transparent conductive coating extends to the back of the insulating ink for circuit treatment outside the window. Specifically, the conductive ink is the same color as the insulating ink.
In addition, it should be noted that the transparent conductive coating in this embodiment may be any one of an indium tin oxide ITO film, a carbon nanotube film, or a nano silver film. The panel substrate may be any of a polycarbonate PC panel, a polyethylene terephthalate PET panel, and a GLASS panel.
Since the first embodiment corresponds to the present embodiment, the present embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and the technical effects that can be achieved in the first embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
A fourth embodiment of the present invention relates to a capacitive touch panel, and the present embodiment is substantially the same as the third embodiment, and is mainly different in that in the third embodiment, a conductive ink is printed on a hole-left portion of an insulating ink, and a transparent conductive coating layer is extended to the back surface of the insulating ink for circuit treatment outside a window. In the fourth embodiment of the invention, the transparent conductive coating is extended to the back of the insulating ink by printing the whole strip of conductive ink on the edge of the window for circuit treatment outside the window.
It is worth mentioning that the whole conductive ink partially covers the transparent conductive coating in the window, and partially covers the insulating ink forming the border pattern outside the window of the touch screen, and the adopted conductive ink is transparent conductive ink to maintain the integrity of the window of the touch screen and the beauty of the window and the border of the touch screen.
Since the second embodiment corresponds to the present embodiment, the present embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and the technical effects that can be achieved in the second embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the second embodiment.
Furthermore, it will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (13)
1. A manufacturing method of a capacitive touch screen is characterized by comprising the following steps:
A. providing a panel substrate with a transparent conductive coating;
B. covering insulating ink on the panel substrate according to a frame pattern required by the appearance of the touch screen to form a frame pattern outside a window of the touch screen, and printing a sensor circuit for detecting a touch position on the transparent conductive coating;
C. and covering the insulating ink and the transparent conductive coating with conductive ink, and extending the transparent conductive coating to the back of the insulating ink for circuit treatment outside the window.
2. The method for manufacturing the capacitive touch screen according to claim 1, wherein in the step B, holes are formed in the insulating ink, and the insulating ink with the holes is covered on the panel substrate to form a frame pattern outside a window of the touch screen;
and C, printing the conductive ink on the hole-reserved part, and extending the transparent conductive coating to the back surface of the insulating ink for circuit treatment outside the window.
3. A method for making a capacitive touch screen according to claim 1, wherein the step C comprises the following substeps:
printing the whole conductive ink on the edge of the window, and extending the transparent conductive coating to the back surface of the insulating ink for circuit treatment outside the window.
4. A method for making a capacitive touch screen according to claim 3, further comprising the following steps after step C:
covering the whole conductive ink with the insulating ink;
wherein the insulating ink covering the whole strip of conductive ink overlaps the position of the insulating ink covered by the whole strip of conductive ink.
5. A method of making a capacitive touch screen according to claim 1,
the conductive ink is transparent conductive ink; or,
the conductive ink is the same color as the insulating ink.
6. A method of making a capacitive touch screen according to any of claims 1 to 5,
the transparent conductive coating is an Indium Tin Oxide (ITO) film, a carbon nanotube film or a nano silver film.
7. The method for manufacturing a capacitive touch screen according to any one of claims 1 to 5, wherein the panel substrate is any one of the following:
polycarbonate PC panels, polyethylene terephthalate PET panels, GLASS panels.
8. A capacitive touch screen, comprising: a panel substrate with a transparent conductive coating, characterized in that,
the panel substrate is covered with a frame pattern outside a touch screen window formed by insulating ink, and a sensor circuit for detecting a touch position is printed on the transparent conductive coating;
the panel substrate further comprises: and the conductive ink covers the insulating ink and the transparent conductive coating, and the transparent conductive coating extends to the back of the insulating ink through the conductive ink and is used for circuit treatment outside the window.
9. A capacitive touch screen according to claim 8,
the insulating ink is provided with a reserved hole, and the conductive ink covers the reserved hole part of the insulating ink.
10. A capacitive touch screen according to claim 8,
the conductive ink covers the whole edge part of the window.
11. A capacitive touch screen according to any one of claims 8 to 10,
the conductive ink is transparent conductive ink; or,
the conductive ink is the same color as the insulating ink.
12. A capacitive touch screen according to any one of claims 8 to 10,
the transparent conductive coating is an Indium Tin Oxide (ITO) film, a carbon nanotube film or a nano silver film.
13. A capacitive touch screen according to any of claims 8 to 10, wherein the panel substrate is any of:
polycarbonate PC panels, polyethylene terephthalate PET panels, GLASS panels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102403619A CN103324374A (en) | 2013-06-18 | 2013-06-18 | Capacitive touch screen manufacturing method and capacitive touch screen |
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| CN2013102403619A CN103324374A (en) | 2013-06-18 | 2013-06-18 | Capacitive touch screen manufacturing method and capacitive touch screen |
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| CN103823593A (en) * | 2014-02-27 | 2014-05-28 | 蓝思科技（长沙）有限公司 | Method for preparing cover glass with colorful window frame and application of cover glass |
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Application publication date: 20130925 |