CN107272980B - Manufacturing method of large-size capacitive touch screen with double-sided structure - Google Patents
Manufacturing method of large-size capacitive touch screen with double-sided structure Download PDFInfo
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- CN107272980B CN107272980B CN201710655956.9A CN201710655956A CN107272980B CN 107272980 B CN107272980 B CN 107272980B CN 201710655956 A CN201710655956 A CN 201710655956A CN 107272980 B CN107272980 B CN 107272980B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 102
- 239000000463 material Substances 0.000 claims abstract description 100
- 239000000758 substrate Substances 0.000 claims abstract description 69
- 238000007650 screen-printing Methods 0.000 claims abstract description 61
- 230000006698 induction Effects 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 66
- 238000000034 method Methods 0.000 claims description 50
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 41
- 229910052709 silver Inorganic materials 0.000 claims description 41
- 239000004332 silver Substances 0.000 claims description 41
- 238000005530 etching Methods 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 16
- 239000007769 metal material Substances 0.000 claims description 14
- 239000011241 protective layer Substances 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 238000010329 laser etching Methods 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 4
- 239000011521 glass Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- G—PHYSICS
- 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
Abstract
The invention discloses a manufacturing method of a large-size capacitive touch screen with a double-sided structure, which comprises the step of detecting a first substrate to judge whether a screen printing screen plate is deformed, in particular to the deformation of a driving unit array for manufacturing ITO materials and the areas of a first screen printing screen plate and a second screen printing screen plate of an induction unit array, which are formed on the substrate and correspond to the pattern parts of the induction electrodes and/or the driving electrodes. Specifically, patterns comprising a first detection electrode and a second detection electrode are designed in a first screen printing plate and a second screen printing plate, the first detection electrode and the second detection electrode which are made of ITO materials are respectively formed on two surfaces of a first substrate in a screen printing mode, alignment conditions between the first detection electrode and the second detection electrode are compared, position offset between the first detection electrode and the second detection electrode is calculated, and the offset data are used in manufacturing steps of other substrates, so that alignment conditions of other substrates are improved.
Description
Technical Field
The invention relates to a capacitive touch screen technology, in particular to a manufacturing method of a large-size capacitive touch screen with a double-sided structure.
Background
Touch screens (touch screens) are currently the simplest, convenient and natural man-machine interaction mode, and are widely applied to various fields such as information inquiry, industrial control, self-service, multimedia teaching, electronic games and the like. Particularly, large-sized (20 inches and above) touch screens have been increasingly used because of their ability to provide a larger viewable area (or operable area).
Among various touch screen types, the capacitive touch screen has the advantages of accuracy, good use, abrasion resistance, long service life and the like, occupies a place in a large-size touch screen, and has better application prospect. An example of a large-sized capacitive touch screen of a double-sided structure as shown in fig. 1-3, wherein fig. 1, 2 schematically show the topography of the front and back sides thereof, respectively, and fig. 3 shows the relationship between the locations of the structures on the two surfaces, wherein the structure of the front side is shown in solid lines and the structure of the back side is shown in dashed lines. As shown in the drawing, the sensing unit array 11 of ITO material and the driving unit array 12 of ITO material are respectively formed on both surfaces of the substrate 1, wherein the sensing unit array 11 is in a multi-column serial structure, each column of sensing units is respectively connected to the corresponding sensing electrode 31 through the respective sensing electrode trace 21, the driving unit array 12 is in a multi-row serial structure, each row of driving units is respectively connected to the corresponding driving electrode 32 through the driving electrode trace 22, wherein the sensing unit array 11 and the driving unit array 12 are arranged in a visible region of the touch screen, the sensing electrode trace 21, the sensing electrode 31, the driving electrode trace 22 and the driving electrode 32 are arranged in a frame region surrounding the visible region, and wherein the sensing electrode 31 and the driving electrode 32 are arranged in a region near an edge of the substrate 1 for electrical connection with an external circuit.
In general, the process of making a touch screen as shown in FIG. 1 includes: forming a sensing cell array 11 and a driving cell array 12 aligned with each other, respectively; manufacturing a protective layer on the formed sensing cell array 11 and driving cell array 12; forming a sensing electrode wiring 21 and a sensing electrode 31, and forming a driving electrode wiring 22 and a driving electrode 32; protective layers are formed on the formed sense electrode trace 21, sense electrode 31, drive electrode trace 22, and drive electrode 32. In general, a silk screen process is used to make a capacitive touch screen of large size, and a silk screen is used to realize pattern transfer.
However, in actual production, it is found that the screen printing plate is easy to deform due to the material, which affects the yield of the manufactured touch screen product. Particularly when the two screen plates used to make the sensing unit array and the driving unit array are deformed, which affects the alignment between the two. Also, the deformation of the screen is generally non-uniform, which is likely to be localized. Typically, this localized distortion is not discernable by merely viewing the alignment marks on the screen. When deformation (particularly, local deformation) of the screen printing plate, which is not recognized, occurs in an area corresponding to a pattern portion where the sensing electrode and/or the driving electrode are formed on the substrate, the influence of the screen printing plate on the yield is not negligible in consideration of that the interval between the electrodes is generally about 0.3mm, because it may cause serious problems such as hot press dislocation, short circuit, etc. in a subsequent hot press process of the FPC, so that the manufactured touch screen may not be used normally.
Accordingly, those skilled in the art have been working to develop a method for manufacturing a large-sized capacitive touch screen having a double-sided structure, solving the above-mentioned problems.
Disclosure of Invention
In order to achieve the above object, the present invention provides a method for manufacturing a large-sized capacitive touch screen with a double-sided structure, wherein the method comprises the following steps:
a first step of using a first screen having a first pattern including a first cell array thereon; forming a first pattern of ITO material including a first array of cells on a first surface of a substrate; wherein the first pattern comprises a first alignment mark, and the first pattern comprises a first alignment mark of ITO material;
a second step of using a second screen having a second pattern including a second cell array thereon; directly or indirectly aligning the second screen printing plate with the first pattern of the ITO material through an alignment mark, and forming a second pattern of the ITO material, comprising a second cell array, on the second surface of the substrate; the second pattern comprises a second alignment mark, the second pattern comprises a second alignment mark of ITO material, and the second screen printing plate is aligned to the first pattern of the ITO material by aligning the second alignment mark on the second screen printing plate to the first alignment mark of the ITO material in the first pattern;
A third step of using a third screen having a third pattern including a plurality of first electrodes thereon; directly or indirectly aligning the third screen printing plate with the first pattern of the ITO material or the second pattern of the ITO material, and forming a third pattern of a metal material, comprising a plurality of first electrodes, on the first surface of the substrate through a screen printing process; wherein the third pattern comprises a third alignment mark, and the third screen is aligned to the first pattern of the ITO material or the second pattern of the ITO material by aligning the third alignment mark on the third screen to the first alignment mark of the ITO material in the first pattern or the second alignment mark of the ITO material in the second pattern;
a fourth step of using a fourth screen having a fourth pattern including a plurality of second electrodes thereon; directly or indirectly aligning the fourth screen printing plate with the first pattern of the ITO material, the second pattern of the ITO material or the third pattern of the metal material, and forming a fourth pattern of the metal material, comprising a plurality of second electrodes, on the second surface of the substrate through a screen printing process; wherein the fourth pattern comprises a fourth alignment mark, and the fourth screen is aligned to the first pattern of the ITO material or the second pattern of the ITO material or the third pattern of the metal material by aligning the fourth alignment mark on the fourth screen to the first alignment mark of the ITO material in the first pattern or the second alignment mark of the ITO material in the second pattern or the third alignment mark of the metal material in the third pattern;
Wherein, the first pattern and the second pattern both further comprise a plurality of first detection electrodes and a plurality of second detection electrodes, and the formed first pattern and second pattern both further comprise a plurality of first detection electrodes of ITO material and a plurality of second detection electrodes of ITO material;
the first detection electrodes and the second detection electrodes are arranged in the first pattern and the second pattern such that the plurality of first detection electrodes and the plurality of second detection electrodes in the first pattern are aligned one to one with the plurality of first detection electrodes and the plurality of second detection electrodes in the second pattern in a first direction when the first screen and the second screen are aligned to coincide with each other; and is also provided with
When the first and third screen printing plates are registered with each other (e.g., by the first and third alignment marks), the plurality (at least two) of first detection electrodes are aligned one-to-one with all or part of the plurality of first electrodes in a first direction and are not registered in a second direction (e.g., spaced apart by a set distance; and the plurality of first detection electrodes are closer to an edge of the first screen printing plate); and/or
When the positions of the first and fourth screen plates are registered with each other (e.g., by the first and fourth alignment marks), the plurality of (at least two) second detection electrodes are aligned one-to-one with all or part of the plurality of second electrodes in the first direction and are not registered in the second direction (e.g., spaced apart by a set distance; and the plurality of second detection electrodes are closer to an edge of the first screen plate); and/or
When the positions of the second and third screen plates are registered with each other (e.g., by the second and third alignment marks), the plurality of (at least two) first detection electrodes are aligned one-to-one with all or part of the plurality of first electrodes in the first direction and are not registered in the second direction (e.g., spaced apart by a set distance; and the plurality of first detection electrodes are closer to an edge of the second screen plate); and/or
When the positions of the second screen and the fourth screen are registered with each other (e.g., by the second alignment mark and the fourth alignment mark), the plurality of (at least two) second detection electrodes are aligned one-to-one with all or part of the plurality of second electrodes in the first direction and are not registered in the second direction (e.g., spaced apart by a set distance; and the plurality of second detection electrodes are closer to an edge of the second screen);
Wherein the first direction is a direction in which the plurality of first electrodes, the plurality of second electrodes, the plurality of first detection electrodes, and the plurality of second detection electrodes are arranged; the second direction is perpendicular to the first direction;
the manufacturing method comprises a detection step for the first substrate and a subsequent manufacturing step for the other substrates, wherein
In the detecting step, the first step and the second step are performed on the substrate first; then observing the formed first plurality of detection electrodes of the ITO material and the formed second plurality of detection electrodes of the ITO material, and recording the deviation displacement of the positions of the first plurality of detection electrodes and the second plurality of detection electrodes in the first direction relative to the positions of the first plurality of detection electrodes and the second plurality of detection electrodes in the second plurality of detection electrodes;
in the manufacturing step, the first step to the fourth step are sequentially performed on the substrate, wherein in the second step, after the second screen is aligned to the first pattern of the ITO material by an alignment mark (for example, by aligning the second alignment mark to the first alignment mark of the ITO material), the second screen is moved in a direction opposite to the first direction with respect to the second surface by the offset displacement, and then the second pattern is formed on the second surface by a screen printing process.
Further, the manufacturing method further includes cutting the substrate after the manufacturing step to remove the plurality of first detection electrodes of the ITO material and the plurality of second detection electrodes of the ITO material.
Further, the first step includes,
placing the first screen printing plate on the first surface, wherein a first ITO layer is formed on the first surface;
forming a patterned first etching paste layer on the first ITO layer through a silk screen printing process; the thickness of the first etching paste layer is 5-50 microns;
drying the first etching paste layer, wherein the drying temperature is 100-300 ℃, and the drying time is 10-50 minutes;
and removing the first etching paste layer.
Further, the second step includes,
placing the second screen on the second surface, the second surface having a second ITO layer formed thereon;
forming a patterned second etching paste layer on the second ITO layer through a silk screen printing process; the thickness of the second etching paste layer is 5-50 microns;
drying the second etching paste layer, wherein the drying temperature is 100-300 ℃, and the drying time is 10-50 minutes;
and removing the second etching paste layer.
Further, the manufacturing method also comprises the steps of,
in the manufacturing step, after the first step and the second step are completed, a protective layer is formed on the surfaces of the formed first cell array of the ITO material and the formed second cell array of the ITO material, respectively.
Further, the third step comprises,
placing the third screen on the protective layer on the first surface;
forming the third graph of the silver paste material through a silk screen printing process; the thickness of the silver paste is 5-30 microns;
and curing the silver paste, wherein the curing temperature is 100-250 ℃, and the curing time is 10-50 minutes.
Further optionally, the third pattern further includes a plurality of first electrode traces; the third pattern is formed to further include a plurality of first electrode traces of silver paste material.
Further optionally, the third step further comprises,
after the curing is completed, the third pattern is etched using a laser etching process to form a plurality of first electrode traces of silver paste material.
Further, the manufacturing method also comprises the steps of,
in the manufacturing step, after the third step is completed, forming a layer of protection layer on the surfaces of the formed multiple first electrode wires of the silver paste material, and curing the protection layer;
The curing temperature is 80-250 degrees, and the curing time is 10-50 minutes.
Further, the fourth step includes,
placing the fourth screen on the protective layer on the second surface;
forming the fourth graph of the silver paste material through a silk screen printing process; the thickness of the silver paste is 5-30 microns;
and curing the silver paste, wherein the curing temperature is 100-250 ℃, and the curing time is 10-50 minutes.
Further optionally, the fourth pattern further includes a plurality of second electrode traces; the fourth pattern is formed to further include a plurality of second electrode traces of silver paste material.
Further optionally, the fourth step further comprises,
after the curing is completed, the fourth pattern is etched using a laser etching process to form a plurality of second electrode traces of silver paste material.
Further, the manufacturing method also comprises the steps of,
in the manufacturing step, after the fourth step is completed, forming a layer of protection layer on the surfaces of the formed second electrode wires of the silver paste material, and curing the protection layer;
the curing temperature is 80-250 degrees, and the curing time is 10-50 minutes.
Further alternatively, the first cell array is a driving cell array; the first electrode is a driving electrode; the first electrode wire is a driving electrode wire;
The second cell array is an induction cell array; the second electrode is an induction electrode; the second electrode trace is an inductive electrode trace.
Further alternatively, the first cell array is an array of sensing cells; the first electrode is an induction electrode; the first electrode wire is an induction electrode wire;
the second cell array is a driving cell array; the second electrode is a driving electrode; the second electrode trace is a drive electrode trace.
Further, the substrate is rectangular; the first direction is the length direction of the rectangle.
Further, the first electrodes, the second electrodes, the first detection electrodes and the second detection electrodes are rectangular, and have a width of 0.1-3mm and a length of 0.5-10mm.
Further, the set distance is 0.1-50mm.
Further, the material of the substrate is glass.
It can be seen that, in the method for manufacturing a capacitive touch screen with a double-sided structure, whether the screen printing plate is deformed or not is judged by performing the detection step on the first substrate, particularly, the deformation of the area corresponding to the pattern portion of the sensing electrode and/or the driving electrode formed on the substrate, which occurs in the first and second screen printing plates for manufacturing the driving unit array and the sensing unit array of the ITO material. Specifically, patterns comprising a first detection electrode and a second detection electrode are designed in a first screen printing plate and a second screen printing plate, the first detection electrode and the second detection electrode which are made of ITO materials are respectively formed on two surfaces of a first substrate in a screen printing mode, alignment conditions between the first detection electrode and the second detection electrode are compared, position offset between the first detection electrode and the second detection electrode is calculated, and the offset data are used in manufacturing steps of other substrates, so that alignment conditions of other substrates are improved. Therefore, the invention can effectively reduce or even eliminate the adverse effect of the deformation of the screen printing plate on the product, thereby improving the yield of the large-size capacitive touch screen with the double-sided structure. The manufacturing method of the invention has the advantages of simplicity, easy implementation and low cost.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
Fig. 1-3 show one example of a prior art large-size capacitive touch screen of a double-sided structure, wherein fig. 1, 2 schematically show the topography of the front and back sides thereof, respectively, and fig. 3 shows the relationship between the locations of the structures on the two surfaces, wherein the structure of the front side is shown in solid lines and the structure of the back side is shown in dashed lines.
FIG. 4 shows the detection steps in a method for manufacturing a large-sized capacitive touch screen with a double-sided structure according to the present invention in a preferred embodiment.
Fig. 5-8 schematically illustrate first, second, third and fourth screen printing plates used in the method of making a double-sided structured large-size capacitive touch screen of the present invention in a preferred embodiment.
FIG. 9 shows the positional relationship between the sense/drive sense electrodes and the sense electrodes on the alignment marks of the first and third screen plates when they are aligned with each other in a preferred embodiment.
FIG. 10 shows the positional relationship between the sense/drive sense electrodes and the drive electrodes on the second and fourth screen printing plates when the alignment marks are aligned with each other in a preferred embodiment.
FIG. 11 shows the first two steps in the fabrication process of the large-size capacitive touch screen with double-sided structure of the present invention in a preferred embodiment.
Fig. 12 shows the operation of cutting the substrate after the completion of the manufacturing step in the manufacturing method of the large-sized capacitive touch screen with the double-sided structure according to the present invention in a preferred embodiment.
Fig. 13 and 14 schematically illustrate first and second screen printing plates used in the method of manufacturing a large-sized capacitive touch screen having a double-sided structure according to another preferred embodiment of the present invention.
Detailed Description
The manufacturing method of the large-size capacitive touch screen with the double-sided structure comprises the steps of firstly detecting one substrate and then manufacturing other substrates. The detecting step may be performed on the substrate of the first touch screen to be manufactured when a batch of touch screens are manufactured; and executing the manufacturing steps on the substrates of the touch screens to be manufactured in the batch. Alternatively, the detecting step may be performed on the first substrate to be fabricated that is started every day; and executing the manufacturing steps on the base plates of other touch screens to be manufactured in the same day. Alternatively, the detecting step may be performed by starting the first substrate to be manufactured every time the screen printing machine is started; and executing the manufacturing steps for starting the substrates of other touch screens to be manufactured for the silk screen printing machine.
In a preferred embodiment of the present invention, as shown in FIG. 3, a substrate 110 is inspected. Wherein, the material of the substrate 110 is glass, preferably ITO glass; it is rectangular, with a length of 600mm and a width of 360mm.
The detection steps are specifically as follows:
in the first step, an array of sensing cells of ITO material, a first alignment mark 114, a sensing detection electrode 112, and a driving detection electrode 113 are formed on a first surface of a substrate 110 using a first screen 100.
Wherein the first surface of the substrate 110 has been formed with a first ITO layer 1101.
The first screen 100 used is shown in fig. 5, and has a first pattern thereon, which includes a sensing cell array 101, a first alignment mark 104, a sensing electrode 102, and a driving electrode 103.
The sensing detection electrode 102 and the driving detection electrode 103 in the first pattern are arranged next to one side of the first screen 100, as shown in fig. 5, on the upper long side, and each of them is arranged along the long side. The reason for this arrangement is that the sensing step requires alignment of the sense sensing electrode 102 in the first screen 100 and the sense electrode 302 in the third screen 300 (see fig. 7) and alignment of the drive sensing electrode 103 in the first screen 100 and the sense electrode 403 in the fourth screen 400 (see fig. 8). The alignment described above is specifically:
When the first alignment mark 104 of the first screen 100 and the third alignment mark 304 of the third screen 300 coincide with each other in alignment with the positions of the first screen 100 and the third screen 400, as shown in fig. 9, the plurality of sensing electrodes 102 are aligned one by one with the plurality of sensing electrodes 301 in a first direction (i.e., the above-mentioned long sides) along the arrangement direction of the plurality of sensing electrodes, and the plurality of sensing electrodes 102 are spaced apart from the plurality of sensing electrodes by a set distance in a second direction. The second direction is perpendicular to the first direction, and on the first screen 100, the second direction is directed from the first cell array 201 to the plurality of first sensing electrodes 102 and the plurality of driving detection electrodes 103, i.e., the vertically upward direction in fig. 5. Therefore, it can be said that the plurality of sensing electrodes 102 are closer to the upper long side than the plurality of sensing electrodes 302.
Similarly, when the first alignment mark 104 and the fourth alignment mark 404 coincide with each other in alignment with the positions of the first screen 100 and the fourth screen 400, the plurality of drive detection electrodes 103 and the plurality of drive electrodes 403 are aligned one by one in the above-described first direction along the direction in which the plurality of drive electrodes 403 are arranged, and the plurality of drive detection electrodes 103 are spaced apart from the plurality of drive electrodes 403 by a set distance in the above-described second direction.
In this example, the plurality of driving detection electrodes 103 are spaced apart from the plurality of driving electrodes 403 by a distance equal to the distance by which the plurality of sensing detection electrodes 102 are spaced apart from the plurality of sensing electrodes in the second direction.
The first step described above specifically includes, see fig. 4, a and b:
1. a first screen 100 is placed over the first ITO layer 1101 on the first surface.
2. Forming a patterned first etching paste layer on the first ITO layer 1101 by a screen printing process; the first etching paste layer can be formed by applying ITO dry etching paste (product of gold wetting technology Co., ltd.) with model ZL-3D-8, and has a thickness of 5-50 μm.
3. The first layer of etching paste is baked, for example, by placing the substrate 110 into an oven. Wherein the temperature of the drying is 100-300 ℃, and the drying time is 10-50 minutes. In this process, the etching paste layer reacts with the contacted ITO layer, and the portion of the ITO layer is removed.
4. The first etching paste layer is removed, for example, by immersing the substrate in clean water and washing. Thereby leaving a patterned ITO layer on the first surface of the substrate 110 in the same pattern as the first pattern of the first screen 100.
In the second step, a driving unit array of ITO material, a second alignment mark 214, an inductive sensing electrode 212, and a driving sensing electrode are formed on the second surface of the substrate 110 using the second screen 200.
Wherein, the second surface of the substrate 110 has formed thereon a second ITO layer 1102. In this example, the substrate 110 is formed with ITO layers on both surfaces thereof in advance. However, in other examples, the substrate 110 may have an ITO layer formed on only one surface thereof in advance as the first ITO layer 1101; after the first step is completed, a second ITO layer 1102 is formed on the other surface, and then a second process is performed.
The second screen 200 has thereon a second pattern including a driving unit array 201, a second alignment mark 103, a sensing detection electrode 202, and a driving detection electrode 203, as shown in fig. 6.
The sensing electrodes 202 and the driving electrodes 203 in the second pattern correspond to the positions of the sensing electrodes 102 and the driving electrodes 103 in the first pattern, i.e., when the first and second alignment marks 104, 204 of the first and second screen printing plates 100, 200 are aligned to overlap the first and second screen printing plates 100, 200, the sensing electrodes 102, 202 of the first and second screen printing plates 100, 200 are aligned to each other, and the driving electrodes 103, 203 are aligned to each other.
Thus, it can be known from the previous description of the sensing detection electrode 102 and the driving detection electrode 103 of the first screen 100:
When the second alignment mark 204 of the second screen 200 and the third alignment mark 304 of the third screen 300 coincide with each other in alignment with the positions of the second screen 200 and the third screen 300, the plurality of sensing electrodes 202 and the plurality of sensing electrodes 302 are aligned one to one in the aforementioned first direction along the direction in which the plurality of sensing electrodes 302 are arranged, and the plurality of sensing electrodes 202 are spaced apart from the plurality of sensing electrodes 302 by a set distance in the aforementioned second direction; and is also provided with
When the second alignment mark 204 and the fourth alignment mark 404 of the fourth screen 400 coincide with the positions of the second screen 200 and the fourth screen 400 in alignment with each other, as shown in fig. 10, the plurality of driving detection electrodes 203 and the plurality of driving electrodes 403 are aligned one by one in the aforementioned first direction along the direction in which the plurality of driving electrodes 403 are arranged, and the plurality of driving detection electrodes 203 are spaced apart from the plurality of driving electrodes 403 by a set distance in the aforementioned second direction.
In this example, the plurality of sensing electrodes 202 are spaced apart from the plurality of sensing electrodes 302 in the aforementioned second direction by a distance equal to the distance by which the plurality of driving detection electrodes 203 are spaced apart from the plurality of driving electrodes 403 in the aforementioned second direction, and also equal to the distance by which the plurality of driving detection electrodes 103 are spaced apart from the plurality of driving electrodes 403 in the second direction and the distance by which the plurality of sensing detection electrodes 102 are spaced apart from the plurality of sensing electrodes in the second direction.
Preferably, the set distance is 0.1-1mm.
The second step described above specifically includes, see c in fig. 4:
1. the second screen 200 is placed over the second ITO layer 1102 on the second surface and the second alignment marks 204 on the second screen 200 are aligned with the first alignment marks 114 of ITO material formed on the first surface.
2. Forming a patterned second etching paste layer on the second ITO layer 1102 through a silk screen process; the second etching paste layer can be formed by applying ITO dry etching paste with model ZL-3D-8 and has a thickness of 5-50 micrometers.
3. The second etch paste layer is baked, for example, by placing the substrate 110 into an oven. Wherein the temperature of the drying is 100-300 ℃, and the drying time is 10-50 minutes. In this process, the etching paste layer reacts with the contacted ITO layer, and the portion of the ITO layer is removed.
4. The second etching paste layer is removed, for example, by immersing the substrate in clean water and washing. Thereby leaving a patterned ITO layer on the second surface of the substrate 110 in the same pattern as the second pattern of the second screen 200.
After the completion of the second one of the inspection steps, the operator observes the plurality of sensing electrodes 112, 212 of the ITO material and the plurality of driving sensing electrodes of the ITO material formed on both surfaces of the substrate 110, records positional deviations therebetween, and specifically, records deviation displacements of the plurality of sensing electrodes 212 with respect to the plurality of sensing electrodes 112 in the aforementioned first direction, as shown by c in fig. 4. This offset displacement is a vector, i.e. its direction is recorded in addition to the magnitude of the offset displacement. The magnitude of the offset displacement of sensing electrode 212 in a first direction relative to sensing electrode 112, shown as c in fig. 4, is distance a, and the direction is to the right.
In addition, the offset displacement in the first direction of the plurality of drive detection electrodes formed on both surfaces may also be recorded.
Thus, the inspection of the first substrate 110 is completed, and then the fabrication steps may be performed on the other substrates of the lot, and this will be described below using one of the substrates 210 as an example.
In a preferred embodiment of the present invention, as shown in fig. 11, a substrate 210 is subjected to a fabrication process. The material of the substrate 210 is ITO glass, which is rectangular, and has a size of 360mm by 600mm.
The preparation steps are as follows:
first, as shown in d and e of fig. 11, an array of sensing cells of ITO material, a first alignment mark 114, a sensing electrode 112, and a driving electrode 113 are formed on a first surface of a substrate 210 using a first screen 100.
Wherein the first surface of the substrate 201 has been formed with a first ITO layer 2101.
The first screen 100 used is the first screen 100 used in the detecting step, and the structure thereof is not described herein.
In addition, the details of the first step are the same as those of the first step performed in the detection step, and are not described here.
In the second step, as shown in f of fig. 11, a driving unit array of ITO material, a second alignment mark 214, an inductive sensing electrode 212, and a driving sensing electrode are formed on the second surface of the substrate 210 using the second screen 200.
Wherein the second surface of the substrate 210 has been formed with a second ITO layer 2102.
The second screen 200 used in the detecting step is the second screen 200, and the structure thereof is not described herein.
The difference between the second step and the second step performed in the detection step is that:
when the second screen 200 is initially placed over the second ITO layer 1102 on the second surface, after the second alignment marks 204 on the second screen 200 are aligned with the first alignment marks 114 of ITO material formed on the first surface, the screen printing is no longer directly performed, but the second screen 200 is moved relative to the second surface with a relative displacement opposite to the offset displacement obtained in the detecting step. In this example, the second screen eye is moved to the left by a distance A in the first direction.
A screen printing process is then performed to pattern the second ITO layer 2102. The specific operation of this part is the same as the second step performed in the detection step and is not described here.
After the first and second steps are completed, a protective layer is formed on the surfaces of the first and second unit arrays of ITO material, respectively. The protective layers formed on the first and second surfaces, respectively, may be performed after the completion of the first and second steps, respectively, or may be performed after the completion of the first and second steps.
In a third step, a third pattern of a metallic material including a plurality of sensing electrodes is formed on the first surface of the substrate 210 using the third screen 300, and a plurality of sensing electrode traces are formed.
The third screen printing plate 300 is shown in fig. 7, and the third pattern thereon includes a third alignment mark 304, a plurality of sensing electrodes 302, and a plurality of sensing electrode traces 301.
The third step specifically comprises;
1. the third screen printing plate 300 is placed over the protective layer on the first surface with its third alignment marks 304 aligned to the first alignment marks 114 of the ITO material.
2. Forming a patterned silver paste material, namely a third alignment mark comprising the silver paste material, a plurality of sensing electrodes and a third pattern of a plurality of sensing electrode wires, on the first surface through a silk screen printing process; the thickness of the silver paste is 5-30 microns.
3. And curing the patterned silver paste at 100-250 ℃ for 10-50 minutes.
In this example, a plurality of sensing electrodes and a plurality of sensing electrode traces of the silver paste material are simultaneously formed by a screen printing process.
However, in other examples, it is also possible to form a plurality of sensing electrodes of a silver paste material and a silver paste portion for forming a plurality of sensing electrode traces (i.e., a plurality of sensing electrode traces not directly forming a silver paste material) using only a silk screen process, and then, after the above-described curing is completed, etch the above-described silver paste portion using a laser etching process to form the sensing electrode traces of the respective silver paste materials. In this example, the third pattern of the third screen printing plate used may include only the plurality of sensing electrodes and the pattern portion corresponding to the silver paste portion described above.
Fourth, a fourth pattern of a metal material including a plurality of sensing electrodes is formed on the second surface of the substrate 210 using the third screen 400, and a plurality of sensing electrode traces are formed.
The fourth screen printing plate 400 is shown in fig. 8, and the fourth pattern thereon includes a fourth alignment mark 304, a plurality of driving electrodes 403, and a plurality of driving electrode traces 401.
The fourth step specifically comprises;
1. the fourth screen printing plate 400 is placed over the protective layer on the second surface with its fourth alignment marks 404 aligned with the second alignment marks 214 of ITO material.
2. Forming a patterned silver paste material, namely a fourth pattern comprising a fourth alignment mark of the silver paste material, a plurality of driving electrodes and a plurality of driving electrode wires, on the second surface through a silk screen printing process; the thickness of the silver paste is 5-30 microns.
3. And curing the patterned silver paste at 100-250 ℃ for 10-50 minutes.
Similarly, in other examples, it is also possible to form a plurality of driving electrodes of a silver paste material and a silver paste portion for forming a plurality of driving electrode traces (i.e., a plurality of driving electrode traces that do not directly form a silver paste material) using only a silk screen process, and then, after the above-described curing is completed, etch the above-described silver paste portion using a laser etching process to form the driving electrode traces of the respective silver paste materials. In this example, the fourth pattern of the fourth screen used may include only the plurality of driving electrodes and the pattern portion corresponding to the silver paste portion described above.
Finally, the substrate 210 after the above manufacturing steps is cut to remove the portions where the plurality of driving detection electrodes of the ITO material are located, as shown in fig. 12, along the illustrated transverse line, so as to separate the portions where the plurality of driving detection electrodes of the ITO material are located. It can be seen that the resulting substrate 210 is identical to that shown in fig. 1-3, i.e., the finished product of a large-size capacitive touch screen of a double-sided structure is finally obtained.
In another preferred embodiment of the present invention, the method of making a double sided structured large size capacitive touch screen of the present invention is implemented using first and second screen printing plates 1100, 1200 as shown in fig. 13 and 14. In comparison with the previously described embodiments, the first pattern of the first screen 1100 used in the present embodiment further includes a first electrode 1102, and the second pattern of the second screen 1200 further includes a second electrode 1203; the specific detection steps and manufacturing steps are identical to those of the previous preferred embodiment, and are not repeated here.
Thus, in this embodiment, the first pattern on the first surface of the substrate after the detecting step and the fabricating step further includes a first electrode of ITO material, and the second pattern on the second surface further includes a second electrode of ITO material; then, a first electrode of a metal material is formed over the first electrode of the ITO material, and a second electrode of a metal material is formed over the second electrode of the ITO material. The advantage of doing so is that through ITO material's first, second electrode, metal material's first, second electrode can adhere to the surface of base plate better, from this guarantees the integrality of electrode to improve the yields.
It should be further noted that in the preferred embodiment described above in connection with the drawings, only four (i.e., first-fourth) screen panels are involved, and for simplicity, the alignment marks on each screen panel are described as first-fourth alignment marks that can be aligned one to another. However, one of ordinary skill in the art will appreciate that there are indirect registration means other than this direct registration means when registering the screen.
For example, after the first step of the inspection step and the manufacturing step described in the above embodiments, the other screen having the other alignment marks thereon is used, and thereby the first pattern of the first surface of the substrate is changed to be the first pattern having the other alignment marks, and then the second screen is used so that the second alignment marks are aligned with the other alignment marks in the first pattern. This does not directly align the second alignment mark in the second screen with the first alignment mark in the first pattern, but the second screen is still indirectly aligned with the first pattern (through its second alignment mark with the other alignment mark in the first pattern).
Similarly, the third screen may also be indirectly aligned with the first pattern of ITO material or the second pattern of ITO material, and the fourth screen may also be indirectly aligned with the first pattern of ITO material or the second pattern of ITO material or the third pattern of metal material.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. A manufacturing method of a large-size capacitive touch screen with a double-sided structure comprises the following steps:
a first step of using a first screen having thereon a first pattern including a first cell array; forming a first pattern of ITO material including a first array of cells on a first surface of a substrate;
a second step of using a second screen having a second pattern including a second cell array thereon; aligning the second screen printing plate with the first pattern of the ITO material through an alignment mark, and forming a second pattern of the ITO material, comprising a second cell array, on the second surface of the substrate;
A third step of using a third screen having a third pattern including a plurality of first electrodes thereon;
aligning the third screen printing plate with the first pattern of the ITO material or the second pattern of the ITO material, and forming a third pattern of a metal material, comprising a plurality of first electrodes, on the first surface of the substrate through a screen printing process;
a fourth step of using a fourth screen having a fourth pattern including a plurality of second electrodes thereon;
aligning the fourth screen printing plate with the first pattern of the ITO material or the second pattern of the ITO material or the third pattern of the metal material, and forming a fourth pattern of the metal material, comprising a plurality of second electrodes, on the second surface of the substrate through a screen printing process;
the first pattern and the second pattern both further comprise a plurality of first detection electrodes and a plurality of second detection electrodes, and the formed first pattern and second pattern both further comprise a plurality of first detection electrodes of ITO material and a plurality of second detection electrodes of ITO material;
the first detection electrodes and the second detection electrodes are arranged in the first pattern and the second pattern such that the plurality of first detection electrodes and the plurality of second detection electrodes in the first pattern are aligned one to one with the plurality of first detection electrodes and the plurality of second detection electrodes in the second pattern in a first direction when the first screen and the second screen are aligned to coincide with each other; and when the first screen and the third screen are registered with each other, the plurality of first detection electrodes are aligned one by one with all or part of the plurality of first electrodes in the first direction and are not registered in the second direction; and/or when the first screen and the fourth screen are registered with each other, the plurality of second detection electrodes are aligned one-to-one with all or part of the plurality of second electrodes in the first direction and are not registered in the second direction; and/or when the second screen and the third screen are registered with each other, the plurality of first detection electrodes are aligned one-to-one with all or part of the plurality of first electrodes in the first direction and are not registered in the second direction; and/or when the second screen and the fourth screen are registered with each other, the plurality of second detection electrodes are aligned one-to-one with all or part of the plurality of second electrodes in the first direction and are not registered in the second direction;
Wherein the first direction is a direction in which the plurality of first electrodes, the plurality of second electrodes, the plurality of first detection electrodes, and the plurality of second detection electrodes are arranged; the second direction is perpendicular to the first direction;
the manufacturing method comprises a detection step of performing first one of the substrates and a subsequent manufacturing step of performing other substrates, wherein in the detection step, the first step and the second step are performed first; then observing the formed first plurality of detection electrodes of the ITO material and the formed second plurality of detection electrodes of the ITO material, and recording the deviation displacement of the positions of the first plurality of detection electrodes and the second plurality of detection electrodes in the first direction relative to the positions of the first plurality of detection electrodes and the second plurality of detection electrodes in the second plurality of detection electrodes;
in the manufacturing step, the first step to the fourth step are sequentially performed, wherein in the second step, after the second screen is aligned to the first pattern of the ITO material by the alignment mark, the second screen is moved in a direction opposite to the first direction with respect to the second surface by the offset displacement, and then the second pattern is formed on the second surface by a screen printing process.
2. The fabrication method of claim 1, wherein the fabrication method further comprises dicing the substrate after the fabrication step to remove the plurality of first detection electrodes of the ITO material and the plurality of second detection electrodes of the ITO material.
3. The method of claim 1 or 2, wherein the first step comprises,
placing the first screen printing plate on the first surface, wherein a first ITO layer is formed on the first surface;
forming a patterned first etching paste layer on the first ITO layer through a silk screen printing process; the thickness of the first etching paste layer is 5-50 microns;
drying the first etching paste layer, wherein the drying temperature is 100-300 ℃, and the drying time is 10-50 minutes;
removing the first etching paste layer;
and removing the first etching paste layer and the first ITO layer covered by the first etching paste layer.
4. The method of claim 3, wherein the second step comprises,
placing the second screen on the second surface, the second surface having a second ITO layer formed thereon;
forming a patterned second etching paste layer on the second ITO layer through a silk screen printing process; the thickness of the second etching paste layer is 5-50 microns;
Drying the second etching paste layer, wherein the drying temperature is 100-300 ℃, and the drying time is 10-50 minutes;
removing the second etching paste layer;
and removing the second etching paste layer and the second ITO layer covered by the second etching paste layer.
5. The method of manufacturing as claimed in claim 4, wherein the method of manufacturing further comprises,
in the manufacturing step, after the first step and the second step are completed, a protective layer is formed on the surfaces of the formed first cell array of the ITO material and the formed second cell array of the ITO material, respectively.
6. The method of claim 5, wherein the third step comprises,
placing the third screen on the protective layer on the first surface;
forming the third graph of the silver paste material through a silk screen printing process; the thickness of the silver paste is 5-30 microns;
and curing the silver paste, wherein the curing temperature is 100-250 ℃, and the curing time is 10-50 minutes.
7. The method of claim 6, wherein the third step further comprises,
after the curing is completed, the third pattern is etched using a laser etching process to form a plurality of first electrode traces of silver paste material, wherein the fourth step further comprises,
After the curing is completed, the fourth pattern is etched using a laser etching process to form a plurality of second electrode traces of silver paste material.
8. The method of claim 5, wherein the fourth step comprises,
placing the fourth screen on the protective layer on the second surface;
forming the fourth graph of the silver paste material through a silk screen printing process; the thickness of the silver paste is 5-30 microns;
and curing the silver paste, wherein the curing temperature is 100-250 ℃, and the curing time is 10-50 minutes.
9. The method of claim 7, wherein
The first cell array is a driving cell array; the first electrode is a driving electrode; the first electrode wire is a driving electrode wire;
the second cell array is an induction cell array; the second electrode is an induction electrode; the second electrode trace is an inductive electrode trace.
10. The method of claim 7, wherein
The first cell array is a sensing cell array; the first electrode is an induction electrode; the first electrode wire is an induction electrode wire;
the second cell array is a driving cell array; the second electrode is a driving electrode; the second electrode trace is a drive electrode trace.
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