CN104866156B - A kind of sapphire substrate graphene surface formula capacitance plate and preparation method - Google Patents
A kind of sapphire substrate graphene surface formula capacitance plate and preparation method Download PDFInfo
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Abstract
The invention discloses a kind of sapphire substrate graphene surface formula capacitance plate and preparation methods, are related to the layer structure technical field of capacitive touch screen.Including from top to bottom successively including cover layer, OCA optical adhesive layer, graphene conductive layer and Sapphire Substrate, the epitaxial growth single-layer or multi-layer graphene conductive layer in the Sapphire Substrate, the graphene conductive layer is surrounded by metal copper electrode, and it is bonded with graphene, the metal copper electrode is connected with contact conductor, and the metal copper electrode can be connect by contact conductor with control chip.The present invention reasonably combines sapphire and graphene, improves the wearability of touch screen surface, and the application of graphene simplifies manufacture craft, improves light transmittance, reduce the production cost.
Description
Technical Field
The invention relates to the technical field of a layered structure of a capacitive touch screen.
Background
The sapphire has the advantages of high hardness, scratch resistance, good heat resistance, high light transmittance, stable chemical property and the like, can replace the traditional glass material to manufacture a touch screen protective substrate, and meets the requirements of preventing electronic products such as mobile phones, watches and the like from being broken and scratched. The graphene is a two-dimensional hexagonal structure formed by carbon atoms, has good light transmission, conductivity and mechanical properties, and has the advantages of high sensitivity, light weight, high light transmittance, high conductivity and low cost. The light transmittance of the single-layer graphene reaches 97.7%, and the method is very suitable for researching transparent conductive films. At present, ITO is mainly used for manufacturing a working layer of the touch screen, and the ITO contains indium metal with limited content on the earth, is expensive and particularly has high toxicity, so that the application of the ITO is limited. As a new star of carbonaceous materials, graphene is considered as a substitute material of ITO (indium tin oxide) due to the characteristics of low dimensionality and capability of forming a permeable conductive network under the condition of low density, and is applied to the aspect of touch screens. Therefore, the sapphire and the graphene are reasonably combined, and a novel sapphire substrate graphene surface type capacitive screen structure is designed and developed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a sapphire substrate graphene surface type capacitive screen and a preparation method thereof, wherein sapphire and graphene are reasonably combined, so that the wear resistance of the surface of a touch screen is improved, the application of the graphene simplifies the manufacturing process, the light transmittance is improved, and the manufacturing cost is reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a sapphire substrate graphite alkene surface formula electric capacity screen, includes from last to including apron layer, OCA optical cement layer, graphite alkene conducting layer and sapphire substrate down in proper order epitaxial growth individual layer or multilayer graphite alkene conducting layer on the sapphire substrate, the graphite alkene conducting layer is equipped with the metal copper electrode all around, and laminates with graphite alkene, the metal copper electrode is connected with the electrode lead, the metal copper electrode passes through the electrode lead and can be connected with control chip.
Furthermore, the metal copper electrode is divided into four parts, the four parts are respectively attached to four sides of the graphene conducting layer, the four parts are not communicated with each other at the corners, and the middle position of each part is connected with an electrode lead.
Furthermore, the metal copper electrode is divided into four parts, the four parts are respectively attached to four corners of the graphene conducting layer, the middle of each edge is not communicated, and the corner position of each part is connected with an electrode lead.
Furthermore, the metal copper electrode be a whole, the laminating is in graphite alkene conducting layer four sides, and end to end intercommunication all is connected with the electrode lead on four angles.
Further, the sapphire substrate is a double-sided polished substrate, the thickness of the OCA optical adhesive layer is 0.001-10mm, the width of the metal copper electrode is 0.01-10mm, and the cover plate layer is made of a PC material.
A preparation method of a sapphire substrate graphene surface type capacitive screen comprises the following steps:
1) selecting a sapphire substrate with two polished surfaces, and epitaxially growing a single-layer or multi-layer graphene material on the sapphire substrate to form a graphene conducting layer, wherein the graphene conducting layer is used as a touch screen conducting layer, and the sapphire substrate is used as a base plate;
2) plating a long and narrow metal copper electrode on the periphery of the graphene conducting layer, wherein the metal copper electrode can be widened or narrowed according to actual requirements and is connected with an electrode lead;
3) an OCA optical adhesive layer is covered on the graphene conducting layer and the metal copper electrode, and can be thickened or thinned according to actual requirements;
4) and manufacturing a cover plate layer on the OCA optical adhesive layer so as to finish the whole sapphire substrate graphene surface type capacitive screen.
Further, the graphene conducting layer in step 1) may be transferred to the sapphire substrate by growing single-layer or multi-layer graphene on another substrate, or by spin-coating oxidized graphene on the sapphire substrate.
Furthermore, the thickness of the OCA optical adhesive layer is 0.001-10mm, the width of the metal copper electrode is 0.01-10mm, and the cover plate layer is made of a PC material.
Further, the metal copper electrode in the step 2) is connected with an electrode lead in one of the following three ways, namely, a first way: the metal copper electrode is divided into four parts which are respectively attached to four sides of the graphene conducting layer, every two parts of the metal copper electrode are not communicated at the corners, and the middle position of each part is connected with an electrode lead; and the second method comprises the following steps: the metal copper electrode is divided into four parts which are respectively attached to four corners of the graphene conducting layer, the middle of each edge is not communicated, and the corner position of each part is connected with an electrode lead; and the third is that: the metal copper electrode be a whole, the laminating is in graphite alkene conducting layer four sides, and end to end intercommunication all is connected with the electrode lead on four angles.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the novel projection type capacitive screen is prepared by combining the advantages of the sapphire and the graphene, and the novel high-hardness sapphire material is used as the touch screen protective substrate, so that the wear resistance of the surface of the touch screen is improved; the graphene replaces the traditional Indium Tin Oxide (ITO) to prepare the capacitive screen, and is used as a conductive layer of the capacitive screen, so that the manufacturing process is simplified, the light transmittance is improved, and the manufacturing cost is reduced.
When the graphene capacitive touch screen works, a low-voltage alternating current battery is formed in the graphene conductive layer, when a finger of a user contacts the surface of the graphene capacitive touch screen, a coupling capacitor is formed between the finger and the graphene conductive layer, a certain amount of charges are transferred to a human body at the moment, in order to recover charge loss, the charges are replenished from four corners of the graphene capacitive touch screen, the amount of the replenished charges in each direction is proportional to the distance of a contact point, and the position of the contact point can be calculated by the control chip.
The cover plate layer is made of a PC material; the function of the OCA optical cement layer is as follows: firstly, the bonding property between the graphene conducting layer and the cover plate layer is increased; secondly, graphene is protected from being damaged; and thirdly, eliminating the influence of the surface unevenness and the horizontal ripple phenomenon of the graphene after growth or transfer on the touch screen in the prior art.
The preparation method of the graphene conductive layer includes three methods: the first method is that a graphene material is directly epitaxially grown on a sapphire substrate; secondly, growing graphene on other substrates and then transferring the graphene to a sapphire substrate; thirdly, graphene oxide is coated on the surface of the sapphire substrate in a spinning mode; the sapphire substrate is used as a substrate, and the graphene material is used as a conducting layer to prepare the surface type capacitive screen.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of the present invention;
FIG. 2 is a schematic structural view of embodiment 1 of the copper metal electrode and electrode lead connection of FIG. 1;
FIG. 3 is a schematic structural view of embodiment 2 of the copper metal electrode and electrode lead connection of FIG. 1;
FIG. 4 is a schematic structural view of embodiment 3 of the copper metal electrode and electrode lead connection of FIG. 1;
the device comprises a sapphire substrate 1, a graphene conducting layer 2, an OCA optical adhesive layer 3, a cover plate layer 4, a metal copper electrode 5 and an electrode lead 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the sapphire substrate graphene surface capacitive screen provided by the invention comprises a cover plate layer 4, an OCA optical adhesive layer 3, a graphene conducting layer 2 and a sapphire substrate 1 which are sequentially arranged from top to bottom, wherein the single-layer or multi-layer graphene conducting layer 2 is epitaxially grown on the sapphire substrate 1, a metal copper electrode 5 is arranged on the periphery of the graphene conducting layer 2 and is attached to graphene, the metal copper electrode 5 is connected with an electrode lead 6, and the metal copper electrode 5 can be connected with a control chip through the electrode lead 6.
As shown in fig. 2, the metal copper electrode 5 of the present invention is divided into four parts, which are respectively attached to four sides of the graphene conductive layer 2, and two parts of the metal copper electrode are not connected at the corners, and the middle part of each part is connected with an electrode lead 6.
As shown in fig. 3, the metal copper electrode 5 of the present invention is divided into four parts, which are respectively attached to four corners of the graphene conductive layer 2, the middle of each side is not connected, and the corner of each part is connected with an electrode lead 6.
As shown in fig. 4, the metal copper electrode 5 of the present invention is a whole, and is attached to four sides of the graphene conductive layer 2, and is connected end to end, and the four corners are connected to electrode leads 6.
The sapphire substrate 1 is a double-sided polished substrate, the thickness of the OCA optical adhesive layer 3 is 0.001-10mm, the width of the metal copper electrode 5 is 0.01-10mm, and the cover plate layer 4 is made of a PC material.
The invention relates to a preparation method of a sapphire substrate graphene surface type capacitive screen, which comprises the following steps:
1) selecting a sapphire substrate with two polished surfaces, and epitaxially growing a single-layer or multi-layer graphene material on the sapphire substrate to form a graphene conducting layer, wherein the graphene conducting layer is used as a touch screen conducting layer, and the sapphire substrate is used as a base plate;
2) the periphery of the graphene conducting layer is plated with a long and narrow metal copper electrode 5, the metal copper electrode 5 can be widened or narrowed according to actual requirements, and is connected with an electrode lead 6;
3) an OCA optical adhesive layer covers the graphene conducting layer and the metal copper electrode 5, and can be thickened or thinned according to actual requirements;
4) and manufacturing a cover plate layer on the OCA optical adhesive layer so as to finish the whole sapphire substrate graphene surface type capacitive screen.
In the step 1, the graphene conducting layer can be transferred to the sapphire substrate by growing single-layer or multi-layer graphene on other substrates, or oxidized graphene is spin-coated on the sapphire substrate.
In a further optimized embodiment, the thickness of the OCA optical glue layer 3 is 0.001-10mm, the width of the metal copper electrode 5 is 0.01-10mm, and the cover plate layer 4 is made of a PC material.
In a further preferred embodiment, the metallic copper electrode 5 in step 2 is connected to the electrode lead 6 in one of the following three ways, namely: the metal copper electrode 5 is divided into four parts, the four parts are respectively attached to the four sides of the graphene conducting layer 2, the four parts are not communicated with each other at the corners, and the middle part of each part is connected with an electrode lead 6; and the second method comprises the following steps: the metal copper electrode 5 is divided into four parts, the four parts are respectively attached to four corners of the graphene conducting layer 2, the middle of each side is not communicated, and the corner position of each part is connected with an electrode lead 6; and the third is that: the metal copper electrode 5 be a whole, the laminating is in 2 four sides of graphite alkene conducting layer, and end to end intercommunication all are connected with electrode lead 6 on four angles.
The working principle of the invention is as follows: the novel projection type capacitive screen is prepared by combining the advantages of the sapphire and the graphene, and the novel high-hardness sapphire material is used as the touch screen protective substrate, so that the wear resistance of the surface of the touch screen is improved; the graphene replaces the traditional indium tin oxide (the capacitive screen is prepared by ITO, the graphene is used as a conductive layer of the capacitive screen, and the application of the graphene simplifies the manufacturing process, improves the light transmittance and reduces the manufacturing cost.
When the graphene capacitive touch screen works, a low-voltage alternating current battery is formed in the graphene conductive layer, when a finger of a user contacts the surface of the graphene capacitive touch screen, a coupling capacitor is formed between the finger and the graphene conductive layer, a certain amount of charges are transferred to a human body at the moment, in order to recover charge loss, the charges are replenished from four corners of the graphene capacitive touch screen, the amount of the replenished charges in each direction is proportional to the distance of a contact point, and the position of the contact point can be calculated by the control chip.
The cover plate layer is made of a PC material; the function of the OCA optical cement layer is as follows: firstly, the bonding property between the graphene conducting layer and the cover plate layer is increased; secondly, graphene is protected from being damaged; and thirdly, eliminating the influence of the surface unevenness and the horizontal ripple phenomenon of the graphene after growth or transfer on the touch screen in the prior art.
The preparation method of the graphene conductive layer includes three methods: the first method is that a graphene material is directly epitaxially grown on a sapphire substrate; secondly, growing graphene on other substrates and then transferring the graphene to a sapphire substrate; thirdly, graphene oxide is coated on the surface of the sapphire substrate in a spinning mode; the sapphire substrate is used as a substrate, and the graphene material is used as a conducting layer to prepare the surface type capacitive screen.
Claims (2)
1. The utility model provides a sapphire substrate graphite alkene surface formula electric capacity screen which characterized in that: the device comprises a cover plate layer (4), an OCA optical adhesive layer (3), a graphene conducting layer (2) and a sapphire substrate (1) from top to bottom, wherein a single-layer or multi-layer graphene conducting layer (2) is epitaxially grown on the sapphire substrate (1), metal copper electrodes (5) are arranged on the periphery of the graphene conducting layer (2) and are attached to graphene, the metal copper electrodes (5) are connected with electrode leads (6), and the metal copper electrodes (5) can be connected with a control chip through the electrode leads (6);
the metal copper electrode (5) is divided into four parts which are respectively attached to four sides of the graphene conducting layer (2), the four parts are not communicated with each other at the corners, and the middle part of each part is connected with an electrode lead (6); or,
the metal copper electrode (5) is divided into four parts which are respectively attached to four corners of the graphene conducting layer (2), the middle of each side is not communicated, and the corner position of each part is connected with an electrode lead (6); or,
the metal copper electrode (5) is an integral body, is attached to four sides of the graphene conducting layer (2), is communicated end to end, and is connected with electrode leads (6) at four corners;
the metal copper electrode is in a long and narrow shape formed by plating the periphery of the graphene conducting layer, and can be widened or narrowed according to actual requirements;
the graphene conducting layer is formed by growing single-layer or multi-layer graphene on other substrates and then transferring the single-layer or multi-layer graphene onto a sapphire substrate, or oxidized graphene is spin-coated on the sapphire substrate;
the sapphire substrate (1) is a double-sided polished substrate, the thickness of the OCA optical adhesive layer (3) is 0.001-10mm, the width of the metal copper electrode (5) is 0.01-10mm, and the cover plate layer (4) is made of a PC material;
a low-voltage alternating current battery is formed in the graphene conducting layer, when a user finger contacts the surface of the capacitive screen, a coupling capacitor is formed between the finger and the graphene conducting layer, charges are transferred to a human body, the charges are replenished from four corners of the capacitive screen to recover charge loss, the amount of the replenished charges in each direction is proportional to the distance of the contact point, and the position of the contact point is calculated by the control chip;
the OCA optical adhesive layer is used for increasing the bonding property between the graphene conducting layer and the cover plate layer, protecting the graphene from being damaged and eliminating the phenomena of unevenness and water ripples on the surface of the grown or transferred graphene.
2. The method for preparing a sapphire substrate graphene surface type capacitive screen according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
1) selecting a sapphire substrate with two polished surfaces, and epitaxially growing a single-layer or multi-layer graphene material on the sapphire substrate to form a graphene conducting layer, wherein the graphene conducting layer is used as a touch screen conducting layer, and the sapphire substrate is used as a base plate;
2) the periphery of the graphene conducting layer is plated with a long and narrow metal copper electrode (5), the metal copper electrode can be widened or narrowed according to actual requirements, and the metal copper electrode (5) is connected with an electrode lead (6);
3) an OCA optical adhesive layer covers the graphene conducting layer and the metal copper electrode (5), and can be thickened or thinned according to actual requirements;
4) manufacturing a cover plate layer on the OCA optical adhesive layer so as to complete the whole sapphire substrate graphene surface type capacitive screen;
the graphene conducting layer in the step 1) can be transferred to the sapphire substrate by growing single-layer or multi-layer graphene on other substrates, or oxidized graphene is coated on the sapphire substrate in a spinning mode;
the metal copper electrode (5) in the step 2) is connected with an electrode lead (6) in one of the following three ways, namely, the first way: the metal copper electrode (5) is divided into four parts which are respectively attached to four sides of the graphene conducting layer (2), the four parts are not communicated with each other at the corners, and the middle part of each part is connected with an electrode lead (6); and the second method comprises the following steps: the metal copper electrode (5) is divided into four parts which are respectively attached to four corners of the graphene conducting layer (2), the middle of each side is not communicated, and the corner position of each part is connected with an electrode lead (6); and the third is that: the metal copper electrode (5) is an integral body, is attached to four sides of the graphene conducting layer (2), is communicated end to end, and is connected with electrode leads (6) at four corners;
the thickness of the OCA optical adhesive layer (3) is 0.001-10mm, the width of the metal copper electrode (5) is 0.01-10mm, and the cover plate layer (4) is made of a PC material;
a low-voltage alternating current battery is formed in the graphene conducting layer, when a user finger contacts the surface of the capacitive screen, a coupling capacitor is formed between the finger and the graphene conducting layer, charges are transferred to a human body, the charges are replenished from four corners of the capacitive screen to recover charge loss, the amount of the replenished charges in each direction is proportional to the distance of the contact point, and the position of the contact point is calculated by the control chip;
the OCA optical adhesive layer is used for increasing the bonding property between the graphene conducting layer and the cover plate layer, protecting the graphene from being damaged and eliminating the phenomena of unevenness and water ripples on the surface of the grown or transferred graphene.
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| CN113253242B (en) * | 2021-06-03 | 2021-10-22 | 宁波永新光学股份有限公司 | Window assembly mounted on vehicle-mounted laser radar |
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| WO2012108371A1 (en) * | 2011-02-09 | 2012-08-16 | 株式会社インキュベーション・アライアンス | Method for producing multilayer graphene coated substrate |
| US9632542B2 (en) * | 2013-05-02 | 2017-04-25 | The Boeing Company | Touch screens comprising graphene layers |
| CN104020919B (en) * | 2014-05-20 | 2018-01-19 | 深圳市航泰光电有限公司 | A kind of grapheme capacitive touch screen and its production method |
| CN204833226U (en) * | 2015-06-12 | 2015-12-02 | 中国电子科技集团公司第十三研究所 | Sapphire base plate graphite alkene surface formula electric capacity screen |
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