CN114326213A - Support piece of display module backlight source, manufacturing method of support piece and display module - Google Patents
Support piece of display module backlight source, manufacturing method of support piece and display module Download PDFInfo
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- CN114326213A CN114326213A CN202210060644.4A CN202210060644A CN114326213A CN 114326213 A CN114326213 A CN 114326213A CN 202210060644 A CN202210060644 A CN 202210060644A CN 114326213 A CN114326213 A CN 114326213A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 35
- 238000007639 printing Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000002671 adjuvant Substances 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 abstract description 12
- 239000010439 graphite Substances 0.000 abstract description 12
- -1 graphite alkene Chemical class 0.000 abstract description 8
- 230000017525 heat dissipation Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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Abstract
The disclosure provides a support piece of a display module backlight source, a manufacturing method thereof and a display module, wherein a first surface of the support piece comprises a non-mark area and at least one mark area; wherein the non-marking areas are coated with graphene ink. This is disclosed through scribble graphite alkene printing ink at support piece's non-mark zone surface, makes the regional mark district that forms of not scribbling graphite alkene printing ink, and then can realize the location in mark position when carrying out the module counterpoint, need not to carry out the radium-shine operation of laser, has avoided the radium-shine operation of mark line complicated and the bad phenomenon that leads to produce, has effectively promoted support piece's radiating efficiency simultaneously.
Description
Technical Field
The disclosure relates to the technical field of display, in particular to a support member of a backlight source of a display module, a manufacturing method of the support member and the display module.
Background
For a liquid crystal display module, a liquid crystal layer cannot actively emit light, a backlight source is required to irradiate the liquid crystal layer to realize light emission, for the display module, a backlight rubber is usually configured to be used as a support member of the backlight source, and a mark line is arranged on one surface of the support member, which is far away from the backlight source, so as to realize module alignment between the display module and a Flexible Printed Circuit (FPC).
At present, the manufacturing mode of mark lines adopts laser, but the laser degree is difficult to control, as shown in fig. 1. The depth inconsistency often appears in Mark line at radium-shine in-process, and the radium-shine shallow of Mark line easily leads to Charge Coupled Device (CCD) to fail when discerning the Mark line, leads to the counterpoint to be inaccurate to influence the module equipment, if the radium-shine deep of Mark line then easily leads to the protruding membrane material that withstands the sizing agent opposite side in the sizing agent back, causes the module fold, influences the final display effect of display module.
Disclosure of Invention
An object of the embodiment of the present disclosure is to provide a support member for a backlight of a display module, a manufacturing method thereof, and a display module, so as to solve the problem that in the prior art, a manufacturing process of a mark line on a support member of a backlight is unstable, which causes inaccurate module alignment or affects a display effect of the module.
The embodiment of the disclosure adopts the following technical scheme: a first surface of the support comprises a non-mark area and at least one mark area; wherein the non-marking regions are coated with graphene ink.
In some embodiments, the mark region is a line region having a first preset width.
In some embodiments, the first predetermined width is between 0.25 mm and 0.35 mm.
In some embodiments, a second face of the support conforms to a backlight source disposed within the first end of the support, the second face being an opposite face of the support from the first face; the first surface of the supporting piece further comprises a space avoiding area which is arranged in the second end part and used for releasing stress generated after the graphene printing ink is dried, and the second end part is one end of the supporting piece, which is far away from the first end part; a positioning portion is arranged between the first end portion and the second end portion, and the marking area is arranged in the positioning portion.
In some embodiments, the distance between the peripheral edge of the non-marking zone and the peripheral edge of the support is a second predetermined width.
In some embodiments, the second predetermined width is between 4 millimeters and 6 millimeters.
In some embodiments, the graphene ink is blended with 10% graphene, 25% resin, and 65% additives and solvents.
This embodiment still provides a display module assembly, includes at least: a backlight source; the support member as described above, wherein the backlight source is attached to the second surface of the support member.
The embodiment also provides a manufacturing method of the support member of the backlight source of the display module, which comprises the following steps: manufacturing a non-marking area and a corresponding shape of a marking area on a silk-screen steel mesh; the silk-screen steel mesh is oppositely arranged on a first surface of a support, graphene printing ink is printed on the first surface by a scraper, and the non-marking area and the marking area are formed; baking and curing the support; and after the support piece after baking and curing is cooled, performing punch forming on the support piece.
In some embodiments, the baking temperature of the support is 100 degrees celsius and the curing time is 8 seconds.
The beneficial effects of this disclosed embodiment lie in: the graphene ink is coated on the surface of the non-marking area of the support piece, so that the area which is not coated with the graphene ink forms the marking area, and then the positioning can be realized when the module is aligned to the marking area, the laser operation of laser is not needed, the generation of bad phenomena caused by the complex laser operation of mark lines is avoided, and meanwhile, the heat dissipation efficiency of the support piece is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a laser process in the prior art;
FIG. 2 is a schematic view of a first side of a support member according to a first embodiment of the present disclosure;
FIG. 3 is another schematic view of a first side of a support member according to the first embodiment of the present disclosure;
FIG. 4 is a flowchart illustrating a method for manufacturing a supporting member of a backlight source of a display module according to a third embodiment of the disclosure;
fig. 5 is a schematic diagram of a silk-screen forming process in a third embodiment of the disclosure.
Detailed Description
Various aspects and features of the disclosure are described herein with reference to the drawings.
It will be understood that various modifications may be made to the embodiments of the present application. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Other modifications will occur to those skilled in the art within the scope and spirit of the disclosure.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.
These and other characteristics of the present disclosure will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.
It should also be understood that, although the present disclosure has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of the disclosure, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the disclosure that may be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as not to obscure the present disclosure with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.
For the liquid crystal display module, the liquid crystal layer can not actively emit light, the backlight source is required to irradiate the liquid crystal layer to realize the emission of light, the display module is generally provided with a backlight rubber iron to be used as a supporting piece of the backlight source, and a mark line is arranged on one surface of the supporting piece far away from the backlight source and used for CCD equipment to identify the position of the mark line, so that the module alignment between the display module and the FPC is realized.
At present, the manufacturing mode of mark lines adopts laser, but the laser degree is difficult to control, as shown in fig. 1. The inconsistent condition of depth often appears in radium-shine in-process Mark line, and the radium-shine shallow of Mark line easily leads to CCD equipment to fail when discerning the Mark line, leads to the inaccurate module equipment that influences of counterpointing, if the radium-shine deep of Mark line then easily leads to the protruding membrane material that withstands the cement opposite side in the cement back, causes the module fold, influences the final display effect of display module.
In order to solve the above problem, a first embodiment of the present disclosure provides a supporting member for a backlight of a display module, where the size of the supporting member is close to the size of the display module, and the specific shape of the supporting member is also adjusted according to the shape of the display module and its actual installation requirement, which is not limited in this embodiment. The supporting member provided by this embodiment includes a first surface and a second surface that are arranged oppositely, where the second surface is used for being attached to a backlight, and the first surface is divided into a non-mark area 10 and at least one mark area 20, as shown in fig. 2, the surface of the non-mark area 10 is coated with graphene ink, and the surface of the mark area 20 is not coated with graphene ink, that is, the mark area 20 is formed at a position where the graphene ink is not coated, so that the surface of the mark area 20 presents the color of the supporting member itself, and has a significant difference from the black non-mark area 10. When the CCD is used for identification, the mark area which is obviously different from the graphene ink can play a role of a mark line, and accurate positioning is carried out on the alignment of a subsequent module.
As shown in fig. 2, the mark region 20 may be shaped as a linear region having a first predetermined width, so that it is closer in shape to the shape of the mark line, which is more easily recognized by the CCD. Specifically, the shape of the mark area 20 may be a straight line, a broken line, or a curved line, and the length of the linear area of each mark area 20 may be adjusted. As shown in fig. 2, the four mark areas 20 are included, wherein two mark areas 20 on the left side in fig. 2 are both linear, the length of the upper mark area 20 is smaller than the length of the lower mark area 20, and two mark areas 20 on the right side are both zigzag, so that the edge determination during module alignment is facilitated. In some embodiments, the first predetermined width of the marking region 20 may be set between 0.25 mm and 0.35 mm, and if the first predetermined width is too narrow, the undried graphene ink may flow to cause the marking region 20 not to be formed; if the first preset width is too wide, although the problem that the mark area 20 is not formed can be avoided, when the module is subsequently aligned, the wider mark area 20 is not beneficial to positioning of the CCD equipment, so that the positioning precision of the CCD equipment is easily reduced, the module is not accurately aligned or the alignment fails, the assembly and the use of the display module are affected, and the yield is reduced.
It should be understood that the width and length of the mark region 20 shown in fig. 2 are only schematic and are used to highlight the position and shape of the mark region 20, and the effect of actual manufacturing is not shown in this embodiment.
In some embodiments, the support member may be divided into three parts, such as a first end part 1 and a second end part 2 at both side end parts of the support member and a positioning part 3 between the first end part and the second end part, as shown in fig. 3. In actual use, the backlight source of the display module is usually disposed in the first end portion 1 of the supporting member (not shown in the figure), that is, the backlight source is disposed near one end of the supporting member, and the mark area 20 is disposed in the positioning portion 3, so that the CCD device can obtain the position of the mark area 20 in the area to perform module alignment operation. When actual preparation support piece, can also set up one on support piece's first face and keep away empty district 30, should keep away from empty district 30 and set up in second end 2, keep away from backlight one side promptly, the coating of graphite alkene printing ink is also not carried out on the surface in empty district 30, and the stress that mainly used release graphite alkene printing ink after drying contracts in and produce avoids printing ink to contract in and leads to support piece deformation and influence display module's roughness.
In some embodiments, the size of the clearance area 30 may be adjusted according to the actual size of the display module, but it should be ensured that the size of the clearance area 30 is much larger than the size of the mark area 20, so as to avoid the CCD device from mistakenly recognizing the clearance area 30 as the mark area 20 during the recognition; meanwhile, the void avoiding area with larger size can realize better stress release effect, and guarantee that the flatness of the support piece meets the requirement. It should be noted that, the first end portion, the second end portion, and the positioning portion recited in the present embodiment are not specifically divided or limited, and only show a schematic positional relationship among the backlight source, the clearance area 30, and the mark area 20 on the support, and may be adjusted according to requirements during actual manufacturing, which is not limited in the present embodiment. It should be noted that the shape of the clearance area 30 may be a rectangular clearance, and the size of the clearance area may be 20mm × 60mm, and the distance from the outer peripheral edge of the clearance area to the edge of the support member is 30mm, so as to ensure that the position of the clearance area 30 can effectively reduce the internal stress.
In the actual process of manufacturing the supporting member, the non-mark area 10 of a plurality of supporting members can be printed on the roll of raw material at the same time, and in order to facilitate the cutting and subsequent installation of the supporting member after printing, as shown in fig. 2 or fig. 3, a certain distance is provided between the peripheral edge of the non-mark area 10 and the peripheral edge of the supporting member, and the distance is a second preset width, and the cutting can be performed in the area when the cutting is performed. When specifically setting up, the second preset width can be between 4 millimeters to 6 millimeters, is convenient for cut and subsequent assembly operation.
It should be understood that the graphene ink used in the present embodiment is formed by blending a certain amount of graphene and resin in an assistant and a solvent, and preferably 10% of graphene, 25% of resin and 65% of assistant and solvent are blended. The graphene printing ink blended in the ratio can form the marking area 20 with clear boundary and moderate line width, so that the marking area 20 can be accurately used for module positioning, and the module assembly precision is improved. Further, in the embodiment, the graphene ink with the above ratio is used for coating the non-mark area 10, so that the good heat dissipation performance of the graphene ink can be utilized, and the heat dissipation capability of the display module is improved.
Specifically, table 1 shows a comparison of the heat dissipation performance of the support fabricated by different processes or under different conditions.
TABLE 1
As can be seen from table 1, the graphite sheet is a commonly used heat dissipation element of the support member, and has good heat dissipation performance, but because the graphite sheet is expensive, the area of the graphite sheet disposed on the support member is usually small, and the graphite sheet cannot be used in a large area. For the supporting piece without any heat dissipation measure, the heat dissipation effect is poor under the basically same test condition, and the normal use of the display module is easily influenced. The graphene ink A comprises the following components in percentage by weight: 10% of graphene, 25% of resin, 65% of auxiliary agent and solvent, wherein the graphene ink B comprises the following components in percentage by weight: based on test results, the graphene ink A has a better heat dissipation effect under the basically same test conditions, the manufacturing cost is lower, the graphene ink A can be coated on the surface of a support in a large area, the good heat dissipation performance of the support is realized, and the display module has better environment adaptability.
This embodiment makes the region of not coating graphite alkene printing ink form the mark district through the non-mark district surface coating graphite alkene printing ink at support piece, and then can realize the location in mark position when carrying out the module counterpoint, need not to carry out the radium-shine operation of laser, has avoided the radium-shine operation of mark line complicacy and the bad phenomenon that leads to produce, has effectively promoted support piece's radiating efficiency simultaneously.
The second embodiment of the disclosure provides a display module, the display module is a liquid crystal display module with a backlight source, the backlight source supports based on the support piece provided by the first embodiment of the disclosure, the second surface of the support piece is attached to the backlight source, the first surface is divided into a non-mark area and at least one mark area, graphene ink is coated on the surface of the non-mark area of the support piece, so that the mark area is formed in the area which is not coated with the graphene ink, and then positioning can be realized in the position of the mark area when module alignment is carried out, laser operation is not needed, the generation of bad phenomena caused by complex laser operation of mark lines is effectively reduced, the process cost can be effectively reduced, and the manufacturing efficiency of the support piece is improved.
A third embodiment of the present disclosure provides a method for manufacturing a supporting member in the first embodiment, which mainly uses a silk-screen forming process, and the flowchart is shown in fig. 4, and mainly includes steps S10 to S40:
s10, manufacturing a non-marking area and a marking area on the silk-screen steel mesh in corresponding shapes;
s20, placing the silk screen steel mesh opposite to the first surface of the support, and printing graphene ink on the first surface by using a scraper to form a non-marking area and a marking area;
s30, baking and curing the support;
and S40, performing punch forming on the support after being baked and solidified is cooled.
Specifically, when manufacturing, firstly, the shape of the silk screen steel mesh is manufactured according to the requirement, the non-mark area is hollowed out, the mark area is filled with the ink through soldering tin or other methods, when the scraper is used for printing graphene ink, as shown in fig. 5, the ink is printed on the first surface of the support through the hollowed-out area, and the part filled with the soldering tin is not printed, so that a blank mark area is formed.
After graphite alkene printing ink printed on support piece, need through stoving solidification design, make graphite alkene printing ink layer stably adhere to on support piece surface, but the coiled material silk screen printing easily leads to the material local or whole S type deformation that takes place after the whole face toasts, leads to the support piece warpage, influences the display module group roughness, consequently needs select suitable stoving temperature and curing time with the support piece deformation that the minimize leads to because of toasting the solidification. Table 2 shows the deformation of the support at different baking temperatures and curing times.
TABLE 2
| Silkscreen pattern | Baking temperature (. degree.C.) | Curing time(s) | Curing effect | Deformation condition |
| Local part | 120 | 7 | Shaping of | S-shape deformation and warping degree>3mm |
| Integral body | 120 | 7 | Shaping of | S-shape deformation and warping degree>3mm |
| Local part | 110 | 7.5 | Shaping of | S-shape deformation and warping degree>2mm |
| Integral body | 110 | 7.5 | Shaping of | S-shape deformation and warping degree>2mm |
| Local part | 100 | 8 | Shaping of | Local degree of warp<0.5mm |
| Integral body | 100 | 8 | Shaping of | S-shape deformation and warping degree>2mm |
| Local part | 90 | 8.5 | Is not formed | Local degree of warp>2mm |
| Integral body | 90 | 8.5 | Is not formed | S-shape deformation and warping degree>2mm |
| Local part | 80 | 9 | Is not formed | Local degree of warp>2mm |
| Integral body | 80 | 9 | Is not formed | S-shape deformation and warping degree>2mm |
Based on table 2, can inject to toast the temperature and be 100 degrees centigrade, and curing time is 8 seconds, can guarantee that curing effect is good this moment, and support piece's warpage is less than 0.5mm simultaneously, satisfies the whole roughness demand of support piece. On this basis, carry out stamping forming to the support piece after the cooling, realize further leveling to support piece, later cut according to the demand, obtain independent support piece and carry out the installation of other subassemblies in the module.
According to the embodiment, the graphene ink is coated on the surface of the non-marking area of the support piece through the screen printing forming process, so that the area which is not coated with the graphene ink forms the marking area, and then the positioning can be realized when the module is aligned to the marking area, the laser operation is not needed, the generation of a bad phenomenon caused by the complex laser operation of a mark line is avoided, and meanwhile, the heat dissipation efficiency of the support piece is effectively improved.
While the present disclosure has been described in detail with reference to the embodiments, the present disclosure is not limited to the specific embodiments, and those skilled in the art can make various modifications and alterations based on the concept of the present disclosure, and the modifications and alterations should fall within the scope of the present disclosure as claimed.
Claims (10)
1. The support piece of the display module backlight source is characterized in that a first surface of the support piece comprises a non-mark area and at least one mark area; wherein the non-marking regions are coated with graphene ink.
2. The support member as claimed in claim 1, wherein the marking zone is a linear region having a first predetermined width.
3. The support member of claim 2, wherein the first predetermined width is between 0.25 mm and 0.35 mm.
4. The support member of claim 1, wherein a second face of the support member is configured to engage a backlight source disposed within the first end of the support member, the second face being an opposite face of the support member from the first face;
the first surface of the supporting piece further comprises a space avoiding area which is arranged in the second end part and used for releasing stress generated after the graphene printing ink is dried, and the second end part is one end of the supporting piece, which is far away from the first end part;
a positioning portion is arranged between the first end portion and the second end portion, and the marking area is arranged in the positioning portion.
5. The support member according to claim 1, wherein a spacing between a peripheral edge of the non-marking zone and a peripheral edge of the support member is a second preset width.
6. Support according to claim 5, characterized in that said second preset width is comprised between 4 and 6 mm.
7. The support according to any one of claims 1 to 6, characterized in that the graphene ink is blended from 10% graphene, 25% resin and 65% adjuvant with a solvent.
8. A display module at least comprises:
a backlight source;
the support of any of claims 1-7, wherein the backlight is conformable to the second face of the support.
9. A manufacturing method of a support member of a display module backlight source is characterized by comprising the following steps:
manufacturing a non-marking area and a corresponding shape of a marking area on a silk-screen steel mesh;
the silk-screen steel mesh is oppositely arranged on a first surface of a support, graphene printing ink is printed on the first surface by a scraper, and the non-marking area and the marking area are formed;
baking and curing the support;
and after the support piece after baking and curing is cooled, performing punch forming on the support piece.
10. The method of claim 9, wherein the support member is baked at 100 degrees celsius for a curing time of 8 seconds.
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| CN106413243A (en) * | 2016-10-31 | 2017-02-15 | 努比亚技术有限公司 | Substrate and circuit board |
| CN207992980U (en) * | 2018-04-24 | 2018-10-19 | 信利光电股份有限公司 | A kind of touch screen for Wearable |
| CN110113866A (en) * | 2019-05-27 | 2019-08-09 | 深圳市三德冠精密电路科技有限公司 | A kind of guard method for preventing flexible circuit board cross Mark from deforming |
| CN110189621A (en) * | 2019-06-27 | 2019-08-30 | 上海碳源汇谷新材料科技有限公司 | A kind of antifalsification label based on graphene |
| CN210626821U (en) * | 2019-06-27 | 2020-05-26 | 北海惠科光电技术有限公司 | Display panel and display device |
| CN110337191A (en) * | 2019-07-03 | 2019-10-15 | 常州轻工职业技术学院 | A method of the 3D printing great power LED printed circuit board based on Graphene conductive ink |
| WO2021255762A1 (en) * | 2020-06-20 | 2021-12-23 | Shilpan Pravinchandra Patel | Graphene based security thread, methods of manufacturing the same and application thereof. |
| CN111740030A (en) * | 2020-06-30 | 2020-10-02 | 上海天马微电子有限公司 | Display panel, display device and manufacturing method of display panel |
| CN113025125A (en) * | 2020-11-04 | 2021-06-25 | 山东华冠智能卡有限公司 | Graphene conductive ink for RFID electronic tag and preparation method thereof |
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