CN111796707A - Metal bridge structure with shadow eliminating effect and touch screen comprising same - Google Patents
Metal bridge structure with shadow eliminating effect and touch screen comprising same Download PDFInfo
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- CN111796707A CN111796707A CN202010484491.7A CN202010484491A CN111796707A CN 111796707 A CN111796707 A CN 111796707A CN 202010484491 A CN202010484491 A CN 202010484491A CN 111796707 A CN111796707 A CN 111796707A
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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
- G06F3/0412—Digitisers structurally integrated in a display
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- 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
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Abstract
The invention discloses a metal bridge structure with a shadow eliminating effect and a touch screen comprising the same, wherein the structure comprises a plurality of folding lines, two adjacent folding lines are connected end to form a bending part, and the folding lines are connected into a metal bridge with two free ends; the metal bridge structure comprises three stacked metal film layers, wherein the metal film layers on the surfaces are subjected to blackening treatment, and the reflectivity of the metal bridge structure is below 35%. The invention also relates to a touch screen comprising the structure. The metal bridge structure disclosed by the invention combines the advantages of the existing ITO (indium tin oxide) bridge and the metal bridge, and achieves the effect of eliminating the shadow of metal bridge points by designing the metal bridge with a certain shape under the condition of not increasing a film layer, so that the appearance effect of a metal bridge scheme product is improved, and the application range of the scheme product is wider.
Description
Technical Field
The invention belongs to the field of touch display, and particularly relates to a metal bridge structure with a shadow eliminating effect and a touch screen comprising the same.
Background
The touch screen product has a double-sided structure, a single-sided bridge structure, a low-end caterpillar structure and the like, and the design of the double-sided touch screen product is mainly applied to apple companies for patent and is applied to apple products or products authorized by apples. The caterpillar structure can only realize simple touch and gestures and is mainly applied to low-end products. Products with a single-sided bridge structure are mainstream in the market, and a large number of consumer electronics, industrial control products, vehicle-mounted products and the like are used. The single-sided bridge structure is divided from the material of the bridging film layer and is provided with an ITO bridge (shown in figure 1) and a metal bridge structure (shown in figure 2). The bridge points of the ITO bridge sensor are not easy to see, but the working procedures are more; the metal bridge sensor has few working procedures, but the metal bridge point is obvious in the conventional design, and the metal bridge is obvious in reflection or transmission.
The single-side bridge structure ITO bridging scheme is the most common scheme in the industry, and the scheme is easy in realization process and technology. As shown in fig. 1, in view of the ITO bridge scheme film layer structure, the scheme has one more ITO film layer than the metal bridge structure product, and the process is decomposed by adding one ITO film coating, one ITO photoetching and etching, so that the product flow is longer, the cost is higher, and the efficiency is lower. In addition, if the ITO bridge scheme is used for forming a film on a PET film, roll-to-roll processing cannot be performed, and the technical difficulty of plating ITO2 after OC is very high.
Compared with the ITO bridge scheme, the single-side bridge type structure metal bridging scheme and the conventional rectangular metal bridge design have the advantages of being more advantageous than the ITO bridge scheme in terms of process flow, cost efficiency and the like, and as shown in figure 2, the film layer structure is reduced by one layer, so that the efficiency can be improved, and the cost can be reduced. However, the metal bridge points of the metal bridge structure product can be easily seen by naked eyes when being directly watched, the appearance effect is poor, the bridge points are obvious and shiny, and the visual effect is influenced. Especially like consumer electronics, the use in a short distance is needed, and the use effect is affected. The product has a narrow application range, can be used only on products with low requirements on appearance effect, or is used on products far away from eyes at ordinary times, and is rarely used on consumer electronics products.
Disclosure of Invention
The invention provides a metal bridge structure with a shadow eliminating effect and a touch screen comprising the same, which combine the advantages of an ITO (indium tin oxide) bridging and a metal bridging, achieve the shadow eliminating effect of a metal bridge point by designing a metal bridge with a certain shape under the condition of not increasing a film layer, improve the appearance effect of a metal bridge scheme product, and enable the application range of the scheme product to be wider.
The technical scheme of the invention is that the metal bridge structure with the shadow eliminating effect comprises a plurality of folding lines, wherein two adjacent folding lines are connected end to form a bending part, and the plurality of folding lines are connected into a fluctuating metal bridge with two free ends; two free ends of the metal bridge are respectively contacted with the two spaced electrodes, the metal bridge is in a multi-layer stacked metal film layer structure, the surface metal film layer is subjected to blackening treatment, and the reflectivity of the metal bridge is below 35%.
Furthermore, the broken lines are 3, and form a Z-shaped metal bridge after being connected, and two free ends of the metal bridge are respectively connected to the spaced electrodes.
Further, the included angle of the bending part is 60-150 degrees.
Furthermore, the metal film layer is sequentially of a three-layer structure of MoNb/AlNd/MoNb, CuNi/Cu/CuNi or CuNi/Cu/CuNiTi from bottom to top.
Further, the width of the metal bridge is 5-15 μm.
Further, the sheet resistance of the metal film on the surface layer of the metal bridge structure is within a range of 0.2 Ω to 1.5 Ω.
The invention also relates to a preparation method of the metal bridge structure with the shadow eliminating effect, which specifically comprises the following steps:
1) sequentially plating three layers of metal films on the surface of a product needing to be provided with a metal bridge structure through magnetron sputtering, and filling a certain amount of oxygen or nitrogen into sputtering gas during magnetron sputtering of surface metal;
2) after the film coating is finished, a photoresist film pattern of the required metal bridge is made on the surface of the film layer through photoetching;
3) after photoetching, removing other redundant metal film layers outside the pattern by an etching method; finally, removing the light resistance film on the surface of the figure to obtain the metal bridge structure with the shadow eliminating effect.
Further, the volume ratio of the oxygen or nitrogen to the sputtering gas in the step 1) is 5-25%.
The invention also relates to a touch screen which comprises a substrate layer, wherein the substrate layer is provided with a shadow eliminating layer and an ITO (indium tin oxide) graph layer, the ITO graph layer is provided with an insulating layer below the metal bridge structure, the metal bridge structure is arranged above the insulating layer, a lead wire positioned at the periphery of the touch screen is arranged on the same layer with the metal bridge structure, and a protective layer is arranged above the metal bridge structure and the lead wire. Wherein the substrate layer can be selected from glass, PET film or COP film or PI film.
The invention also relates to an electronic product, which comprises the touch screen.
According to the conventional rectangular metal bridge structure touch screen, when the screen is lightened, the metal bridge points are lightened visually, the bridge points are very obvious, and the bridge points of the screen which is extinguished or lightened are obviously reflected under a dark background, so that the visual effect is seriously influenced.
The invention respectively solves the problem that the bridge points are obvious when the screen is lighted and extinguished or the background is dark, and has the following beneficial effects:
1. the metal bridge points are obviously lightened in a screen lightening state, the metal bridge with the special shape is designed, the conventional rectangular metal bridge is modified into a Z-shaped metal bridge with a bent part, light rays transmitted from the left corner and the right corner of the metal bridge point form light interference, and the light intensity at the bridge point is weakened, so that the shadow eliminating effect is achieved.
2. Under the state of a dark background of a screen-off or bright screen, the metal bridge points are obviously seen by reflecting external light, and the reflectivity of the metal film layer on the surface layer is reduced from about 50% to below 35%. The specific technical means is that a certain amount of oxygen is filled during sputtering of the surface metal, so that the surface metal is blackened to a certain extent, the reflectivity of the surface metal is reduced, and the metal bridge point reflected light is obviously improved under the state of a screen-off or bright-screen dark background.
3. The metal film material system adopts a MoNb/AlNd/MoNb, or CuNi/Cu/CuNi or CuNi/Cu/CuNiTi three-layer structure; the adhesive force of the metal film on the base material can be met, the electrical performance requirement of the product can be met, the selection of the surface metal can prevent the metal from being oxidized in the air, and the patterning can be realized easily under the existing equipment and process.
4. The metal bridge structure can realize the purpose of eliminating the shadow of the metal bridge points without additionally adding a film system through special bridge point shape design and changing a film coating process, and has low cost and high efficiency.
Drawings
Fig. 1 is a schematic diagram of an ITO bridge structure product in the background art, wherein the left diagram is a schematic diagram of a film layer structure of a touch screen, and the right diagram is a top view of the touch screen.
Fig. 2 is a schematic diagram of a conventional metal bridge structure product in the background art, wherein a left diagram is a schematic diagram of a film layer structure of a touch screen, and a right diagram is a top view of the touch screen.
Fig. 3 is a schematic diagram of a film structure of a touch screen provided in the present invention.
Fig. 4 is a top view of the metal bridge structure of example 1. Wherein 1 is a metal bridge broken line, and 2 is an electrode.
Fig. 5 is a top view of the metal bridge structure of example 2.
Fig. 6 is a schematic structural diagram of a touch screen in embodiment 4.
Fig. 7 is a comparative photograph of mobile phone screen under reflected light, wherein the left image is the mobile phone screen with conventional metal bridge structure, and the right image is the mobile phone screen with metal bridge structure of the present invention.
Fig. 8 is a comparative photograph of a mobile phone screen when transmitting light, wherein the left image is a mobile phone screen of a conventional metal bridge structure, and the right image is a mobile phone screen of a metal bridge structure according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1:
as shown in FIG. 4, a metal bridge structure with shadow eliminating effect comprises 3 folding lines 1, wherein two adjacent folding lines are connected end to form 2 bending parts, and the metal bridge structure is provided with two free ends, the free ends are respectively connected to electrodes 2 at two ends of the metal bridge structure, and the shape of the whole metal bridge is similar to a Z shape when being overlooked. The metal bridge comprises a metal film layer formed by stacking CuNi/Cu/CuNiTi three layers, wherein the surface metal film layer is subjected to blackening treatment, the reflectivity of the metal bridge is below 35%, the surface resistance of the metal bridge is 0.6 Ω, and the width of the metal bridge is 10 μm.
The preparation method of the metal bridge structure with the shadow eliminating effect comprises the following steps:
1) sequentially plating a CuNi/Cu/CuNiTi three-layer metal film on the surface of a product needing to be provided with a metal bridge structure through magnetron sputtering, and filling a certain amount of oxygen into sputtering gas during the magnetron sputtering of the CuNiTi metal film, wherein the volume ratio of the oxygen to the sputtering gas is 15%;
2) after the film coating is finished, a photoresist film pattern of the required metal bridge is made on the surface of the film layer through photoetching;
3) after photoetching, removing other redundant metal film layers outside the pattern by an etching method; finally, removing the light resistance film on the surface of the figure to obtain the metal bridge structure with the shadow eliminating effect.
Example 2: as shown in fig. 5, a metal bridge structure with a shadow eliminating effect includes 5 folding lines, wherein two adjacent folding lines are connected end to form 4 bending portions, and have two free ends, and the free ends are respectively connected to electrodes at two ends of the metal bridge structure. The metal bridge comprises metal film layers stacked by three layers of MoAlMo, wherein the surface metal film layer is subjected to blackening treatment, the reflectivity is 30%, the surface resistance is 0.4 ohm, and the width of the metal bridge is 10 mu m. The preparation method is the same as that of the embodiment 1, a certain amount of nitrogen is filled into sputtering gas when the Mo metal film is subjected to magnetron sputtering, wherein the volume ratio of the nitrogen to the sputtering gas is 25%.
Example 3: the utility model provides a metal bridge structure with shadow effect disappears, this structure includes 4 broken lines, and end to end connection forms 3 kink altogether between two adjacent broken lines to have two free ends, the free end is connected to the electrode at metal bridge structure both ends respectively. The metal bridge comprises a metal film layer formed by stacking CuNi/Cu/CuNi three layers, wherein the surface metal film layer is subjected to blackening treatment, the reflectivity is 35%, the surface resistance is 0.6 ohm, and the width of the metal bridge is 15 mu m. The preparation method is the same as that of the embodiment 1, a certain amount of oxygen is filled into sputtering gas during magnetron sputtering of the CuNi metal film, wherein the volume ratio of nitrogen to the sputtering gas is 10%.
Example 4:
a touch screen was manufactured using the metal bridge structure of example 1, as shown in fig. 3 and 6; the touch screen comprises a substrate layer, wherein a shadow eliminating layer and an ITO (indium tin oxide) graphic layer are arranged on the substrate layer, an insulating layer is arranged below the ITO graphic layer, a metal bridge structure is arranged above the insulating layer, a lead which is positioned on the periphery of the touch screen is arranged on the same layer as the metal bridge structure, and a protective layer is arranged above the metal bridge structure and the lead.
The specific preparation process comprises the following steps:
step 1: plating an ITO shadow eliminating layer and an ITO film on the surface of the substrate by a magnetron sputtering method;
step 2: making the ITO film into a required pattern by yellow light and an etching process;
and step 3: making an insulating layer on a pattern needing to span a bridge on the ITO by a yellow light process;
and 4, step 4: plating metal films on the surfaces of the substrate and the pattern by a magnetron sputtering method;
and 5: making the metal film layer into a bridge and a peripheral lead by yellow light and an etching process;
step 6: and (4) coating a protective layer on the pattern by a yellow light process to obtain the touch screen.
A picture of a mobile phone prepared by using the touch screen obtained in example 4 in reflected light is compared with a mobile phone screen prepared by using a conventional metal bridge structure in the background art, as shown in fig. 7, where the left picture is a mobile phone screen of the conventional metal bridge structure, and the right picture is a mobile phone screen of the metal bridge structure of the present invention. The comparison of the photos when light is transmitted (the mobile phone screen is lighted) is shown in fig. 8, wherein the left picture is the mobile phone screen with the conventional metal bridge structure, and the right picture is the mobile phone screen with the metal bridge structure of the invention. The mobile phone screen adopting the metal bridge structure has better bridge point shadow eliminating effect than that of the conventional metal bridge structure under reflected light or transmitted light, the mobile phone with the conventional metal bridge structure has obvious bridge points visible to naked eyes, and the mobile phone screen adopting the metal bridge structure of the invention has no bridge points observed to naked eyes.
Claims (10)
1. The metal bridge structure with the shadow eliminating effect is characterized by comprising a plurality of folding lines, wherein two adjacent folding lines are connected end to form a bending part, and the plurality of folding lines are connected into a fluctuating metal bridge with two free ends; two free ends of a metal bridge are respectively contacted with two spaced electrodes, the metal bridge is a metal film layer stacked in multiple layers, the surface metal film layer is subjected to blackening treatment, and the reflectivity of the metal bridge is below 35%.
2. The metal bridge structure of claim 1, wherein: the broken lines are 3, and form Z-shaped metal bridge after connection.
3. The metal bridge structure of claim 1, wherein: the included angle of the bending part is 60-150 degrees.
4. The metal bridge structure of claim 1, wherein: the metal film layer is sequentially of a three-layer structure of MoNb/AlNd/MoNb, CuNi/Cu/CuNi or CuNi/Cu/CuNiTi from bottom to top.
5. The metal bridge structure according to any one of claims 1 to 4, wherein: the width of the metal bridge is 5-15 μm.
6. The metal bridge structure according to any one of claims 1 to 4, wherein: the surface resistance of the metal bridge surface layer metal film is 0.2 Ω -1.5 Ω.
7. The method for preparing a metal bridge structure with a shadow-eliminating effect according to any one of claims 1 to 6, comprising the following steps:
1) sequentially plating three layers of metal films on the surface of a product needing to be provided with a metal bridge structure through magnetron sputtering, and filling a certain amount of oxygen or nitrogen into sputtering gas during magnetron sputtering of surface metal;
2) after the film coating is finished, a photoresist film pattern of the required metal bridge is made on the surface of the film layer through photoetching;
3) after photoetching, removing other redundant metal film layers outside the pattern by an etching method; finally, removing the light resistance film on the surface of the figure to obtain the metal bridge structure with the shadow eliminating effect.
8. The method of claim 7, wherein: the volume ratio of the oxygen or nitrogen to the sputtering gas in the step 1) is 5-25%.
9. The utility model provides a touch screen, its characterized in that, this touch screen includes the substrate layer, is equipped with vanishing layer and ITO graphic layer on the substrate layer, and the below that sets up the metal bridge structure on the ITO graphic layer is equipped with the insulating layer, and the insulating layer top sets up the metal bridge structure, sets up with the metal bridge structure with the layer setting in addition and is located touch screen outlying lead wire, and the top of metal bridge structure and lead wire sets up the protective layer.
10. An electronic product, characterized in that: the electronic product comprising the touch screen of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010484491.7A CN111796707B (en) | 2020-06-01 | 2020-06-01 | Metal bridge structure with shadow eliminating effect and touch screen comprising same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010484491.7A CN111796707B (en) | 2020-06-01 | 2020-06-01 | Metal bridge structure with shadow eliminating effect and touch screen comprising same |
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| CN111796707A true CN111796707A (en) | 2020-10-20 |
| CN111796707B CN111796707B (en) | 2023-02-17 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103164094A (en) * | 2011-12-16 | 2013-06-19 | Lg伊诺特有限公司 | Electrode pattern of touch panel and forming method for the same |
| CN103853397A (en) * | 2012-12-04 | 2014-06-11 | 厦门天马微电子有限公司 | Capacitive touch screen and manufacturing method thereof |
| US20170147114A1 (en) * | 2015-06-25 | 2017-05-25 | Boe Technology Group Co., Ltd. | Capacitive touch screen, method of manufacturing the same and display device |
| WO2017143659A1 (en) * | 2016-02-24 | 2017-08-31 | 京东方科技集团股份有限公司 | Metal bridge of touch structure, touch screen, and electronic equipment |
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2020
- 2020-06-01 CN CN202010484491.7A patent/CN111796707B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103164094A (en) * | 2011-12-16 | 2013-06-19 | Lg伊诺特有限公司 | Electrode pattern of touch panel and forming method for the same |
| CN103853397A (en) * | 2012-12-04 | 2014-06-11 | 厦门天马微电子有限公司 | Capacitive touch screen and manufacturing method thereof |
| US20170147114A1 (en) * | 2015-06-25 | 2017-05-25 | Boe Technology Group Co., Ltd. | Capacitive touch screen, method of manufacturing the same and display device |
| WO2017143659A1 (en) * | 2016-02-24 | 2017-08-31 | 京东方科技集团股份有限公司 | Metal bridge of touch structure, touch screen, and electronic equipment |
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| CN111796707B (en) | 2023-02-17 |
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