CN111625153B - Touch device and method for improving yield of double-line laser splicing positions - Google Patents

Abstract

The invention relates to the field of capacitive touch screens, in particular to a touch device and a method for improving the yield of double-line laser splicing positions of the touch device.

Description

A touch device and its method for improving the yield rate of two-line laser splicing

technical field

The invention relates to the field of capacitive touch screens, in particular to a touch device and a method for improving the bit yield of two-line laser splicing.

Background technique

Capacitive touch screen technology uses the current induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are each coated with a layer of ITO. The outermost layer is a thin layer of silica glass protective layer. The interlayer ITO coating is used as the working surface. Four electrodes, the inner ITO is the shielding layer to ensure a good working environment. When a finger touches the metal layer, due to the electric field of the human body, a coupling capacitance is formed between the user and the surface of the touch screen. For high-frequency currents, the capacitance is a direct conductor, so the finger absorbs a small current from the contact point. This current flows out of the electrodes on the four corners of the touch screen respectively, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the touch point through accurate calculation of the four current ratios. . Capacitive screens need to achieve multi-touch by adding mutual capacitance electrodes. Simply put, the screen is divided into blocks, and a group of mutual capacitance modules are set in each area to work independently, so the capacitive screen can work independently. The touch situation of each area is detected and processed to realize multi-touch easily. Capacitive technology touch panel CTP (CapacityTouchPanel) uses the current induction of the human body to work. The capacitive screen is a four-layer composite glass screen. The inner surface and the interlayer of the glass screen are each coated with a layer of ITO (nano indium tin oxide), and the outermost layer is only 0. A touch device and its improved two-line laser splicing Bit yield method 15mm thick silica glass protective layer, interlayer ITO coating as the working surface, four electrodes are drawn from the four corners, and the inner layer of ITO is the screen layer to ensure the working environment. When the user touches the capacitive screen, due to the electric field of the human body, the user's finger and the working surface form a coupling capacitance. Because the working surface is connected with a high-frequency signal, the finger absorbs a small current, which flows from the four corners of the screen respectively. Theoretically, the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position through precise calculation of the four current ratios. It can achieve 99% accuracy and has a response speed of less than 3ms.

With the development and maturity of electronic products, the scope of application of touch screens has gradually expanded, and its manufacturing technologies have also shown diversity. At present, the common structures of capacitive touch screens are G+G (glass to glass capacitive touch screen), OGS (single glass capacitive touch screen), GF (glass to soft film capacitive touch screen), GFF (glass to double layer soft touch screen) film capacitive touch screen), etc., and embedded capacitive screens represented by Oncell (the touch panel function is embedded between the color filter substrate and the polarizer), Incell (the touch panel function is embedded in the liquid crystal pixel) capacitive screen. While the product performance is steadily improving, the size of the product is getting bigger and bigger. Continuously increasing the screen-to-body ratio of the product, minimizing the area of the BM (black matrix) area of the cover, and increasing the area of the display area have become the constant pursuit of the industry.

Traditional capacitive displays are mainly made by the following two methods:

The first method is to print silver paste on the pure ITO (indium tin oxide) conductive film that has etched the VA (display area) layer, and complete the peripheral touch sensing circuit by laser etching. However, because the film thickness of the printed silver paste is not easy to control, and due to the increase in the number of processing times in the production process, the silver paste diluent volatilizes and the viscosity increases, the uniformity of the silver paste particles, and the dust-free environment have a great impact on the circuit. It is difficult to refine the manufacturing process of the capacitive screen, and the production yield is low.

The second method is to use the metal ITO conductive film as the conductive film of the capacitive screen, complete the VA area pattern and peripheral wiring through one chemical etching, and then remove the metal in the VA area by secondary etching, and retain the ITO in the VA area as a conductive sensor. Floor. In this process, since the metal layer is plated on the ITO layer through a vacuum sputtering process, there are tiny voids in the metal layer, which cannot be ruled out by normal visual inspection. The voids are prone to side erosion after one metal etching and one ITO etching. This leads to a significant increase in the air-through area, resulting in disconnection of the touch sensing circuit, which affects the production yield and brings instability to the process.

Chinese patent CN201610578836.9 discloses a capacitive screen and its preparation method. By setting an ITO layer whose surface is a metal conductive layer on a transparent substrate, the metal conductive layer and the ITO layer are chemically etched to form the display area of the capacitive screen and its surroundings. routing area, and further laser etching is performed on the surrounding routing area to form a touch sensing circuit. Through the above method, the preparation method can effectively reduce the space occupied by the capacitive touch sensing circuit, increase the screen ratio of the product, so that the product can achieve the appearance effect of narrow borders, and also effectively improve the process yield and process of the product. stability.

However, in the process of making a capacitive screen, there is a process of laser engraving the circuit, which is to use light to burn off the unnecessary places, so as to leave the required conductive channels; as for the size of the burnt spot, it is determined by the size of the laser spot. According to the current industry The spot size of capacitive screen laser machine is generally between 0.03-0.035mm, so the etched line spacing is generally about 0.035mm; in order to reduce the risk of short circuit, products with space will increase the etched line spacing, through double The method of line laser is to design two parallel laser lines with a distance of 0.01-0.02mm, which is adjusted according to actual needs, so that the etching distance can be changed to about 0.05mm. At the same time, the laser equipment of the capacitive screen is passed The galvanometer divides the laser into blocks, and there will be a splicing position between the blocks, and this splicing position is the most problematic part of the entire laser, and there are more problems in the case of double lines, so this application is a A method to improve the bit yield of two-line laser splicing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a touch device and its method for improving the yield rate of two-line laser splicing. This technical solution solves the problem that the existing laser etching method is prone to laser explosion. The method of improving the yield rate of the two-line laser splicing position is to interrupt the silver paste laser line along the splicing line, so that the line of the interrupted silver paste laser line can avoid the splicing position, and there will be no splicing delay zone come the question.

In order to solve the above technical problems, the present invention provides the following technical solutions:

A touch control device is provided, comprising a capacitive touch screen, the capacitive touch screen has a window area, at least one touch sensing unit electrode is provided on the edge area of the window, each of the touch sensing unit electrodes is connected through a touch connection channel There is a silver paste layer, the silver paste layer is drawn out from the touch connection channel and connected to the corresponding touch sensor unit electrode, the silver paste layer is a double-terminal lead-out method, and the silver paste layer is equipped with an equal number of first The silver paste laser line and the interrupted silver paste laser line, the first silver paste laser line is a complete section, and the interrupted silver paste laser line is provided with several splicing and cutting points, and the splicing and cutting points will interrupt the silver paste. The paste laser line is divided into several sections, and the interrupted silver paste laser lines of each section are independent and not connected to each other.

As a preferred solution of the touch device, the capacitive touch screen has a GG structure, a GF structure, a GFF structure, a GF structure or an OGS structure.

As a preferred solution of this kind of touch device, the capacitive touch screen includes several laser-etched blocks, two adjacent laser-etched blocks are connected together, and a stitching line is provided between the adjacent two laser-etched blocks, so The splicing cutting point is set at the splicing line.

As a preferred solution of the touch control device, the interrupted silver paste laser line is interrupted to both ends along the splicing line to form a depression, and the first silver paste laser line corresponds to the interrupted silver paste laser line one by one, forming a Multiple sets of double lead-out lines, the line distance between the first silver paste laser line and the interrupted silver paste laser line in the same group is 0.01-0.02mm.

As a preferred solution of the touch device, the laser lines for breaking the silver paste are arranged in the laser-etched block, and the number of the laser lines for breaking the silver paste is less than or equal to the number of the laser-etched blocks.

Also provided is a method for improving the bit yield of two-line laser splicing, including the following steps:

Forming an ITO line on the ITO film layer of the capacitive touch screen, the ITO line includes an ITO electrode line and an ITO lead-out line;

Using shrinkage aging treatment to completely crystallize the ITO electrode lines and ITO lead-out lines on the ITO circuit;

Paste the dry film on the ITO circuit, and carry out ultraviolet exposure treatment, so that the dry film is hardened along the direction of the conductive circuit pattern;

Cleaning off the unhardened dry film with a developing solution to expose the ITO circuit;

Etch the exposed ITO lines with etching solution;

Removing the hardened dry film, so that only the ITO circuit layer forming the conductive circuit remains on the ITO film layer;

Printing conductive silver glue on the frame area of the ITO circuit layer forming the conductive circuit, and performing laser etching on the conductive silver glue to form a silver glue overlapping circuit.

As a preferred solution for improving the yield rate of two-line laser splicing of a touch device, conductive silver glue is printed on the frame area of the ITO circuit layer forming the conductive line, and the conductive silver glue is laser etched to form Silver glue lap lines, including:

Determine the area of the frame area of the ITO circuit layer, and divide the frame area of the ITO circuit layer into several laser-etched blocks with equal areas;

Determine the stitching line between two adjacent laser-etched blocks;

In the frame area of the ITO circuit layer, silk screen block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines and interrupted silver paste laser lines;

Baking the silver paste block, the first silver paste laser line and interrupting the silver paste laser line, heating and drying to form a silver paste layer and a wiring silver paste;

The interrupted silver paste laser line after drying is divided into several sections with the stitching line as the critical line;

Laser etching is performed on the laser-etched block with the silver paste block and the trace silver paste to form the silver paste bonding circuit.

As an optimal solution for improving the yield rate of two-line laser splicing of a touch device, the area of the frame area of the ITO line layer is determined, and before the frame area of the ITO line layer is divided into several laser-etched blocks with equal areas, Also includes:

Determine the window area and non-window area of the ITO film layer;

printing a decorative layer on the window area;

forming touch sensing unit electrodes on the non-window area;

A laser shielding layer is printed on the surface of the printing decoration layer.

As a preferred solution of the method for improving the yield rate of two-line laser splicing of a touch device, the edge metal layer is overlapped with the electrodes of the touch sensing unit.

As an optimal solution for improving the yield rate of two-line laser splicing of a touch device, block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines and interruptions are printed on the frame area of the ITO circuit layer. Among the silver paste laser lines, block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines and interrupted silver paste laser lines are silk-screened on the laser shielding layer.

The beneficial effect that the present invention has compared with prior art is:

First determine the window area and non-window area of the ITO thin film layer, print the decorative layer on the window area, and form the touch sensing unit electrode on the non-window area, wherein the edge metal layer overlaps with the touch sensing unit electrode, and then print the decorative layer Laser shielding layer printed on the surface. Divide the frame area of the ITO circuit layer into several laser-etched blocks with the same area, and determine the stitching line between two adjacent laser-etched blocks, that is, find out the difference between the first laser-etched block and the first laser-etched block. The splicing line between the laser shielding layer is silk-screened with block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines and interrupted silver paste laser lines, and the silver paste blocks, first silver paste laser lines and printing The broken silver paste laser line is baked, heated and dried to form a silver paste layer and a silver paste for routing. After drying, the broken silver paste laser line is divided into splice lines as the critical line, and the broken silver paste laser line is divided into In several sections, laser etching is performed on the laser etching block with the silver paste block and the wiring silver paste to form a silver glue lap circuit.

The touch control device and its method for improving the yield rate of the two-line laser splicing position, by interrupting the silver paste laser line along the splicing line, the splicing position can be avoided by interrupting the alignment of the silver paste laser line. There will be no problems caused by splicing delay. According to the production verification, the first silver paste laser line is complete, while the interruption of the silver paste laser line is intermittent, which leads to the depression point where the interruption of the silver paste laser line is interrupted. There is a feeling of a boss, the distance of this boss can be adjusted and optimized according to the accuracy of the actual laser equipment, and this slight boss does not affect the performance of the entire channel, but effectively improves the problem of the laser burst point of a splicing position. It has been verified that the method for improving the yield rate of the two-line laser splicing can effectively improve the problem of the explosion point of the two-line laser splicing, and improve the yield of the two-line laser etching splicing.

Description of drawings

FIG. 1 is a schematic diagram of a common method for improving the yield rate of two-line laser splicing in the prior art;

FIG. 2 is a partial schematic diagram of a common method for improving the bit yield of two-line laser splicing in the prior art;

FIG. 3 is a schematic diagram of a double-improved two-line laser splicing bit yield method in the prior art;

Fig. 4 is a schematic diagram of the method for improving the yield rate of two-line laser splicing according to the present invention;

FIG. 5 is a schematic flow diagram of a double-improved two-line laser splicing bit yield method in the prior art;

Fig. 6 is a schematic flow diagram of S700 ") in the dual-improved double-line laser splicing bit yield method in the prior art;

Fig. 7 is a schematic diagram of the method for improving the yield rate of two-line laser splicing according to the present invention;

Fig. 8 is a schematic flow diagram of S700) in the method for improving the yield rate of two-line laser splicing according to the present invention;

Fig. 9 is a schematic flow diagram 2 of S700) in the method for improving the yield rate of two-line laser splicing according to the present invention;

FIG. 10 is a schematic flowchart of S707) in the method for improving the yield rate of two-line laser splicing according to the present invention.

The labels in the figure are:

1- Touch the connection channel;

2-silver paste layer;

3-The first silver paste laser line;

4- the second silver paste laser line;

5 - the first laser etching block;

6 - the first laser etching block;

7- splicing line;

8- Interrupt the silver paste laser line.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", The orientation or positional relationship indicated by "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have Certain orientations, constructed and operative in certain orientations, therefore are not to be construed as limitations on the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

With the development and maturity of electronic products, the scope of application of touch screens has gradually expanded, and its manufacturing technologies have also shown diversity. At present, the common capacitive touch screen structures are G+G (glass to glass capacitive touch screen), OGS (single glass capacitive touch screen), GF (glass to soft film capacitive touch screen), GFF (glass to double layer soft touch screen) Film capacitive touch screen) and other external capacitive screens, as well as On cell (touch panel function embedded between the color filter substrate and polarizer), In cell (touch panel function embedded in liquid crystal pixels) as representatives Embedded capacitive screen. While the product performance is steadily improving, the size of the product is also getting bigger and bigger. Continuously increasing the screen-to-body ratio of the product, minimizing the area of the BM (black matrix) area of the cover, and increasing the area of the display area have become the goals that people in the industry are constantly pursuing.

Please refer to FIG. 1 and FIG. 2 , the touch control device in the prior art includes a capacitive touch screen, and the capacitive touch screen has a GG structure, a GF structure, a GFF structure, a GF2 structure or an OGS structure. The capacitive touch screen has a window area, and at least one touch sensor unit electrode is provided on the edge area of the window, and each touch sensor unit electrode is connected to a silver paste layer 2 through a touch connection channel 1, and the silver paste layer 2 is connected from the touch connection channel 1 After being drawn out, it is connected to the corresponding touch sensor unit electrode. The silver paste layer 2 is a double-ended lead-out method. The silver paste layer 2 is provided with the first silver paste laser line 3 and the second silver paste laser line 4 with equal numbers. The first silver paste laser line 3 and the second silver paste laser line 4 are both a complete segment, and the first silver paste laser line 3 corresponds to the second silver paste laser line 4 one by one, forming multiple sets of double lead-out lines.

After the touch device in the prior art is directly etched by laser, the line distance between the first silver paste laser line 3 and the second silver paste laser line 4 of the same group is about 0.035mm (that is, the size of the light spot), which is used as a large-scale capacitor When using a screen (above 15 inches), the wiring space of the product will be relatively larger. The most important thing is that because the wiring is relatively long and there are many, the problem of short circuit and other problems will also increase. The problem caused by smallness requires the use of double-line laser etching. The line distance between the first silver paste laser line 3 and the second silver paste laser line 4 of the same group before laser etching is about 0.01-0.02m After laser etching, the distance between the first silver paste laser line 3 and the second silver paste laser line 4 of the same group can be increased to about 0.05 mm.

Two-line laser etching is to laser the capacitive touch screen into blocks, that is to say, the laser is not one line no matter how long it is from the beginning to the end, and then laser another one, but divided into good blocks, and the laser will divide the points at one time. All the lines within this range are lasered, and then move to the next block of lasers. As for the size of the block, it will be determined according to the galvanometer of each device. The general block size on the market is between 120mm-180mm. This also shows that for small-sized mobile phones, there is no need to divide into blocks in a single touch screen. Only when the product is larger than the range of the blocks, the block laser is required. Please refer to Figure 3, the capacitive touch screen includes several laser-etched blocks, two adjacent laser-etched blocks are connected together, and there is a stitching line between the adjacent two laser-etched blocks, such as the adjacent ones in the figure The first laser-etched block 5 and the first laser-etched block 6 , the joint line 7 is the joint line between the first laser-etched block 5 and the first laser-etched block 6 . When performing double-line laser etching, all first silver paste laser lines 3 and all second silver paste laser lines 4 in the area of the first laser etching block 5 will be laser etched first, and then moved to the first laser etching block 6 area range laser etching, similarly need to laser etch all the first silver paste laser lines 3 and all the second silver paste laser lines 4, at this time there will be a gap between the laser etching block and the laser etching block A splice-bit laser case. The position of the stitching line 7 is just the end of the laser of the last first laser etching block 5 and the beginning of the laser of the next first laser etching block 6, which is when the light is most unstable. At this time, in order to solve this problem, the laser etching equipment adopts the method of delay compensation; that is, the laser that extends to a small range of the next block at the end of the previous block, and extends into a short range of the previous block at the beginning of the next block. At this time, the laser at the splicing position will be doubled and repeated as the normal laser, and there will always be a laser burst point not selected by the design, which will lead to the problem of open and short circuit in the circuit.

Please refer to FIG. 5 , the method for improving the bit yield of double-line laser splicing in the prior art includes the following steps:

S100") form ITO lines on the ITO film layer of the capacitive touch screen, and the ITO lines include ITO electrode lines and ITO lead-out lines;

S200") uses shrinkage aging treatment to completely crystallize the ITO electrode wires and ITO lead wires on the ITO circuit;

S300") Lay the dry film on the ITO circuit and perform ultraviolet exposure treatment to harden the dry film along the direction of the conductive circuit pattern;

S400") wash off the unhardened dry film with a developer to expose the ITO circuit;

S500") will expose the ITO line to be etched away with etching solution;

S600") to remove the hardened dry film, so that only the ITO circuit layer that forms the conductive circuit remains on the ITO film layer;

S700") printing conductive silver glue on the frame area of the ITO circuit layer forming the conductive line, and performing laser etching on the conductive silver glue to form silver glue overlapping lines.

Please refer to Figure 6, S700") Print conductive silver glue on the frame area of the ITO circuit layer forming the conductive line, and perform laser etching on the conductive silver glue to form silver glue lap lines, specifically including the following steps:

S701") Determine the area of the frame area of the ITO circuit layer, and divide the frame area of the ITO circuit layer into several laser-etched blocks with equal areas;

S702") Determine the stitching line between two adjacent laser-etched blocks;

S703") Silk-screen block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines 3 and second silver paste laser lines 4 in the frame area of the ITO circuit layer;

S704") Baking the silver paste block, the first silver paste laser line 3 and the second silver paste laser line 4, heating and drying to form the silver paste layer 2 and the wiring silver paste;

S705") Laser etching is performed on the laser etching block with the silver paste block and the wiring silver paste to form a silver glue lap line.

Please refer to FIG. 4 , the touch control device includes a capacitive touch screen, and the capacitive touch screen has a GG structure, a GF structure, a GFF structure, a GF2 structure or an OGS structure. The capacitive touch screen has a window area, and at least one touch sensor unit electrode is provided on the edge area of the window, and each touch sensor unit electrode is connected to a silver paste layer 2 through a touch connection channel 1, and the silver paste layer 2 is connected from the touch connection channel 1 After being drawn out, it is connected to the corresponding touch sensor unit electrode. The silver paste layer 2 is a double-ended lead-out method. The silver paste layer 2 is provided with the first silver paste laser line 3 and the interrupted silver paste laser line 8 in equal numbers. A silver paste laser line 3 is a complete section, and the interrupted silver paste laser line 8 is provided with several splicing and cutting points, and the splicing and cutting points will interrupt the silver paste laser line 8 and divide it into several sections, and the interrupted silver paste laser line 8 of each section Lines 8 are independent and not connected to each other.

The capacitive touch screen includes several laser-etched blocks, two adjacent laser-etched blocks are connected together, and a splicing line is provided between the two adjacent laser-etched blocks, and the splicing cut-off point is set at the splicing line. As shown in the adjacent first laser-etched block 5 and first laser-etched block 6 , the joint line 7 is the joint line between the first laser-etched block 5 and the first laser-etched block 6 .

The interrupted silver paste laser line 8 is interrupted to both ends along the splicing line to form a depression. The first silver paste laser line 3 corresponds to the interrupted silver paste laser line 8 one-to-one, forming multiple sets of double lead-out lines. The line distance between the silver paste laser line 3 and the interrupted silver paste laser line 8 is 0.01-0.02mm, the interrupted silver paste laser line 8 is set in the laser etching block, and the number of interrupted silver paste laser lines 8 is less than or equal to the laser The number of etched blocks.

Please refer to FIG. 7, the method for improving the yield rate of two-line laser splicing of the touch device includes the following steps:

S100) forming an ITO line on the ITO film layer of the capacitive touch screen, the ITO line includes an ITO electrode line and an ITO lead-out line;

S200) using shrinkage aging treatment to completely crystallize the ITO electrode wires and ITO lead wires on the ITO circuit;

S300) Attaching a dry film on the ITO circuit, and performing ultraviolet exposure treatment, so that the dry film is hardened along the direction of the conductive circuit pattern;

S400) Cleaning the unhardened dry film with a developer to expose the ITO circuit;

S500) Etching the exposed ITO lines with an etching solution;

S600) Removing the hardened dry film so that only the ITO circuit layer forming the conductive circuit remains on the ITO film layer;

S700) Print conductive silver glue on the frame area of the ITO circuit layer forming the conductive lines, and perform laser etching on the conductive silver glue to form silver glue overlapping lines.

Please refer to Figure 8, S700) Print conductive silver glue on the frame area of the ITO circuit layer forming the conductive line, and perform laser etching on the conductive silver glue to form a silver glue lap line, specifically including the following steps:

S705) Determine the area of the frame area of the ITO circuit layer, and divide the frame area of the ITO circuit layer into several laser-etched blocks with equal areas;

S706) Determine the stitching line between two adjacent laser etching blocks;

S707) Silk-print block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines 3 and interrupted silver paste laser lines 8 in the frame area of the ITO circuit layer;

S708) Baking the silver paste block, the first silver paste laser line 3 and the interrupted silver paste laser line 8, heating and drying to form the silver paste layer 2 and the wiring silver paste;

S709) Divide the interrupted silver paste laser line 8 after drying into several sections with the stitching line as the critical line;

S710) Laser etching is performed on the laser etching block having the silver paste block and the wiring silver paste to form a silver adhesive bonding circuit.

Please refer to FIG. 9, S705) Determine the area of the frame area of the ITO line layer, and before dividing the frame area of the ITO line layer into several laser-etched blocks with equal areas, the following steps are also included:

S701) Determine the window area and non-window area of the ITO thin film layer;

S702) printing a decoration layer on the window area;

S703) Form a touch sensing unit electrode on the non-window area, and the edge metal layer overlaps with the touch sensing unit electrode;

S704) Printing a laser shielding layer on the surface of the printing decoration layer.

Please refer to FIG. 10 , S707) Specifically, silk-screen block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines 3 and interrupted silver paste laser lines 8 are printed on the laser shielding layer.

In this way, interrupting the routing of the silver paste laser line 8 can avoid the splicing position, and the problem caused by the splicing delay will not occur. After production verification, the first silver paste laser line 3 is complete, and the interruption of the silver paste The laser line 8 is discontinuous, which leads to a feeling of a boss at the concave point that interrupts the discontinuity of the silver paste laser line 8. The distance of the boss can be adjusted and optimized according to the accuracy of the actual laser equipment, and this slight boss does not It affects the performance of the entire channel, but effectively improves the problem of laser explosion of a splicing bit. For an 86-inch product with a length and width of about 2000*1100mm, calculated according to the maximum galvanometer of 180mm, about 7*12=84 blocks need to be separated, and the block in the middle position will appear in 4 directions and need to be spliced. If each There are too many explosion points in the splicing positions in all directions. As long as there is a certain explosion point that is too large, the silver paste layer 2 will be exploded, and there will be a disconnection, or the laser will be blown to the wiring silver paste to cause a short circuit, which will cause a short circuit in the product. become bad. It has been verified that the method for improving the yield rate of the two-line laser splicing can effectively improve the problem of the explosion point of the two-line laser splicing, and improve the yield of the two-line laser etching splicing.

When the present invention is manufactured: first determine the window area and non-window area of the ITO thin film layer, print a decorative layer on the window area, and form a touch sensing unit electrode on the non-window area, wherein the edge metal layer overlaps with the touch sensing unit electrode , and then print the laser shielding layer on the surface of the printing decoration layer. Divide the frame area of the ITO circuit layer into several laser-etched blocks with the same area, determine the stitching line between two adjacent laser-etched blocks, that is, find out the first laser-etched block 5 and the first laser-etched block The splicing line 7 between 6, on the laser shielding layer, block-shaped silver paste block and the first silver paste laser line 3 of multiple groups of dual channels and the interrupted silver paste laser line 8 are used for the silver paste block, the first silver paste block and the silver paste laser line 8. The paste laser line 3 and the interrupted silver paste laser line 8 are baked, heated and dried to form the silver paste layer 2 and the silver paste for routing, and the dried interrupted silver paste laser line 8 takes the splicing line as the critical line, The laser line 8 for breaking the silver paste is divided into several sections, and laser etching is performed on the laser etching block with the silver paste block and the wiring silver paste to form a silver paste overlapping circuit.

In the touch control device and its method for improving the yield rate of two-line laser splicing, by interrupting the silver paste laser line 8 along the splicing line 7, the splicing can be avoided by interrupting the alignment of the silver paste laser line 8 bit, there will be no problems caused by splicing delay. According to production verification, the first silver paste laser line 3 is complete, while the interrupted silver paste laser line 8 is intermittent, which leads to the interruption of the silver paste laser line 8. There is a feeling of convexity at the intermittent concave point. The distance of this convexity can be adjusted and optimized according to the accuracy of the actual laser equipment, and this slight convexity does not affect the performance of the entire channel, but effectively improves the laser explosion of a splicing position. Point of question. It has been verified that the method for improving the yield rate of the two-line laser splicing can effectively improve the problem of the explosion point of the two-line laser splicing, and improve the yield of the two-line laser etching splicing.

Claims (8)

1. A touch device, characterized in that it comprises a capacitive touch screen, the capacitive touch screen has a window area, the edge area of the window is provided with at least one touch sensing unit electrode, each of the touch sensing unit electrodes passes through A touch connection channel (1) is connected with a silver paste layer (2), and the silver paste layer (2) is drawn out from the touch connection channel (1) and connected to the corresponding touch sensing unit electrode, and the silver paste layer (2) be the double-end drawing mode, be provided with the first silver paste laser line (3) of quantity equal in the silver paste layer (2) and interrupt silver paste laser line (8), described first silver paste laser line ( 3) It is a complete section, and the described interrupted silver paste laser line (8) is provided with some splicing cut-off points, and the described spliced cut-off points will interrupt the silver paste laser line (8) and be divided into several sections, each section's punched The silver paste cutting laser lines (8) are mutually independent and not connected to each other; The capacitive touch screen includes several laser-etched blocks, two adjacent laser-etched blocks are connected together, and a splicing line is arranged between the adjacent two laser-etched blocks, and the splicing cutting point is set at the splicing line place; The interrupted silver paste laser line (8) is interrupted to both ends along the splicing line to form a depression, and the first silver paste laser line (3) is in one-to-one correspondence with the interrupted silver paste laser line (8), forming multiple A group of double lead-out lines, the line distance between the first silver paste laser line (3) and the interrupted silver paste laser line (8) in the same group is 0.01-0.02mm. 2 . The touch device according to claim 1 , wherein the capacitive touch screen has a GG structure, a GF structure, a GFF structure, a GF2 structure or an OGS structure. 3. A touch control device according to claim 2, characterized in that, the interrupted silver paste laser lines (8) are arranged in the laser etching block, and the number of interrupted silver paste laser lines (8) is less than or equal to the laser The number of etched blocks. 4. A method for improving the yield rate of two-line laser splicing of a touch device, applied to a touch device as claimed in claim 3, characterized in that it comprises the following steps: Forming an ITO line on the ITO film layer of the capacitive touch screen, the ITO line includes an ITO electrode line and an ITO lead-out line; Using shrinkage aging treatment to completely crystallize the ITO electrode lines and ITO lead-out lines on the ITO circuit; Paste the dry film on the ITO circuit, and carry out ultraviolet exposure treatment, so that the dry film is hardened along the direction of the conductive circuit pattern; Cleaning off the unhardened dry film with a developing solution to expose the ITO circuit; Etch the exposed ITO lines with etching solution; Removing the hardened dry film, so that only the ITO circuit layer forming the conductive circuit remains on the ITO film layer; Printing conductive silver glue on the frame area of the ITO circuit layer forming the conductive circuit, and performing laser etching on the conductive silver glue to form a silver glue overlapping circuit. 5. The method for improving the yield rate of two-line laser splicing of a kind of touch device according to claim 4, characterized in that, on the frame area of the ITO circuit layer forming the conductive circuit, conductive silver glue is printed, and the conductive Silver glue is laser etched to form silver glue lap lines, including: Determine the area of the frame area of the ITO circuit layer, and divide the frame area of the ITO circuit layer into several laser-etched blocks with equal areas; Determine the stitching line between two adjacent laser-etched blocks; In the frame area of the ITO circuit layer, silk screen block-shaped silver paste blocks and multiple sets of dual-channel first silver paste laser lines (3) and interrupted silver paste laser lines (8); The silver paste block, the first silver paste laser line (3) and the interrupted silver paste laser line (8) are baked, heated and dried to form a silver paste layer (2) and a wiring silver paste; The interrupted silver paste laser line (8) after drying is divided into several sections with the stitching line as the critical line; Laser etching is performed on the laser-etched block with the silver paste block and the trace silver paste to form the silver paste bonding circuit. 6. The method for improving the bit yield rate of two-line laser splicing of a touch device according to claim 5, wherein the area of the frame area of the ITO line layer is determined, and the frame area of the ITO line layer is divided into several areas Before the equal laser etched block also includes: Determine the window area and non-window area of the ITO film layer; printing a decorative layer on the window area; forming touch sensing unit electrodes on the non-window area; A laser shielding layer is printed on the surface of the printing decoration layer. 7 . The method for improving the bit yield of two-line laser splicing of a touch device according to claim 5 , wherein the edge metal layer overlaps with the electrodes of the touch sensing unit. 7 . 8. The method for improving the yield rate of two-line laser splicing of a touch device according to claim 7, characterized in that, in the frame area of the ITO circuit layer, a block-shaped silver paste block and multiple sets of dual-channel first In a silver paste laser line (3) and interrupting the silver paste laser line (8), it is the first silver paste laser line (3) and the first silver paste laser line (3) of the silk screen printing block on the laser shielding layer and multiple groups of dual channels. Break the silver paste laser line (8).

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