CN109118970B - Face guard, display module assembly and LED display screen - Google Patents
Face guard, display module assembly and LED display screen Download PDFInfo
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- CN109118970B CN109118970B CN201810855359.5A CN201810855359A CN109118970B CN 109118970 B CN109118970 B CN 109118970B CN 201810855359 A CN201810855359 A CN 201810855359A CN 109118970 B CN109118970 B CN 109118970B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0054—Casings specially adapted for display applications
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- Physics & Mathematics (AREA)
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- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention relates to a face shield, a display module and an LED display screen, wherein the face shield comprises a substrate and a first conducting layer, lamp holes are formed in the substrate and used for LED lamp beads to penetrate through, the substrate comprises a first end face and a second end face which are oppositely arranged, the first conducting layer is arranged on the first end face, and when the face shield is assembled on a PCB (printed circuit board) of the display module through a fastening piece, the first conducting layer is in contact with the fastening piece, so that the first conducting layer, the fastening piece and the lamp face of the PCB form an electromagnetic shielding net. Display module assembly and LED display screen include above-mentioned face guard. Above-mentioned face guard, display module assembly and LED display screen through setting up first conducting layer, make the face guard also produce the interference electromagnetic wave, and the interference electromagnetic wave that the face guard produced and PCB board front side radiation come out opposite direction, the magnetic pole is opposite, therefore can offset each other, and then effectual reduction display module assembly's electromagnetic interference.
Description
Technical Field
The invention relates to the field of display, in particular to a mask, a display module and an LED display screen.
Background
The EMC certification (electromagnetic compatibility certification) of the LED display screen, whether domestic or international, is an admission condition for the LED display screen to enter the market. With the development of the LED industry in recent years, the EMC certification of indoor LED display screens needs to reach the standard of international safety certification. But to outdoor LED display screen, firstly, service environment is comparatively more loose, secondly, because the structural limitation of outdoor LED display screen is difficult to break through to some extent, just make outdoor LED display screen's EMC authentication standard still far away not enough.
Outdoor LED display screen adopts the mode of ground connection to reduce EMC mostly, this kind of mode can satisfy to the great display screen of interval, but, to the less display screen of interval, then can't satisfy, this is because the number of piles (VCC layer) of the PCB board of interval display screen is more, the positive radiation of lamp plate also can be very big, the GND of PCB board unilateral can only be connected to the mode of ground connection, and to the positive radiation of PCB board, then it can not be powerless, furthermore, outdoor LED display screen is because components and parts density is big, the radiation electromagnetic wave of production also can release from the lamp face a large number, this can seriously influence EMC's test data.
Disclosure of Invention
Therefore, it is necessary to provide a mask, a display module and an LED display screen for solving the problem that the front radiation electromagnetic wave of the lamp panel of the LED display screen affects the EMC test.
The invention provides a mask, which comprises a substrate and a first conducting layer, wherein lamp holes are formed in the substrate and used for LED lamp beads to penetrate through, the substrate comprises a first end face and a second end face which are oppositely arranged, the first conducting layer is arranged on the first end face, and when the mask is assembled on a PCB (printed circuit board) of a display module through a fastening piece, the first conducting layer is in contact with the fastening piece, so that the first conducting layer, the fastening piece and the lamp face of the PCB form an electromagnetic shielding net.
In one embodiment, the first conductive layer is a layer of metallic conductive paint.
In one embodiment, the display device further comprises a display layer, wherein the display layer is black and is arranged on the second end face and used for adjusting the display effect of the mask after the first conductive layer is arranged.
Above-mentioned face guard through setting up first conducting layer, makes the face guard also produce the interference electromagnetic wave, and the interference electromagnetic wave that the face guard produced and PCB board front side radiation come out opposite direction, the magnetic pole is opposite, therefore can offset each other, and then the effectual electromagnetic interference who reduces the display module assembly.
The invention provides a display module, which comprises a bottom shell, a PCB (printed circuit board), LED lamp beads, a fastener and a mask, wherein the PCB is arranged on the bottom shell, the LED lamp beads are arrayed on the PCB, the mask is any one of the masks, the LED lamp beads penetrate through lamp holes of the mask and are exposed out of the mask, a plurality of fixing holes are further formed in the substrate of the mask, the fastener penetrates through the fixing holes to connect and fix the mask and the PCB, a first conducting layer of the mask is in contact with the fastener, and an electromagnetic shielding net is formed among the first conducting layer, the fastener and the lamp faces of the PCB.
In one embodiment, the fastening member includes a reverse-buckling pin, the reverse-buckling pin is fixed on the PCB, and the mask is fixedly connected to the PCB through the reverse-buckling pin.
In one embodiment, the reverse-buckling pin comprises a head part and a tail part which are oppositely arranged, the tail part is fixedly connected to the PCB, the head part is provided with an annular groove, the mask is sleeved on the head part at a position corresponding to the annular groove, and the first conducting layer of the mask is in contact with the side wall or the bottom of the annular groove, so that an electromagnetic shielding net is formed among the lamp surface of the PCB, the reverse-buckling pin and the first conducting layer.
In one embodiment, the tail part is fixedly connected to one side of the PCB board, which is far away from the LED lamp bead.
In one embodiment, the head portion includes a first portion, a second portion and a third portion, the first portion is a portion of the head portion located between the annular groove and the tail portion, the second portion is a portion corresponding to the annular groove, the third portion is a portion of the head portion away from the tail portion, the first portion and the third portion are located on two sides of the annular groove respectively, are arranged oppositely, and are connected through the second portion, the mask is sleeved on an outer edge of the second portion, and a diameter of a fixing hole of the mask is smaller than cross-sectional widths of the first portion and the third portion.
In one embodiment, the diameter of the fixing hole is smaller than or equal to the cross-sectional width of the second portion, or larger than the cross-sectional width of the second portion.
The invention provides an LED display screen in a third aspect, which is characterized by comprising a fixing frame and at least one display module, wherein the display module is fixed on the fixing frame, and the display module is any one of the display modules.
According to the display module and the LED display screen, the first conducting layer is arranged on the face cover, so that the face cover also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the face cover are opposite to the interference electromagnetic waves radiated from the front surface of the PCB and have opposite magnetic poles, so that the interference electromagnetic waves can be mutually offset, and the electromagnetic interference of the display module is effectively reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a mask according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view illustrating a display module according to an embodiment of the invention;
fig. 3 is a schematic cross-sectional view illustrating a flip-flop pin of a display module according to an embodiment of the invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 exemplarily shows a structural schematic view of a face shield 10 according to an embodiment of the present invention, the face shield 10 includes a substrate 110 and a first conductive layer 120, a lamp hole 110a is formed in the substrate 110 for an LED lamp to pass through, the substrate 110 includes a first end surface 111 and a second end surface 113 which are oppositely disposed, the first conductive layer 120 is disposed on the first end surface 111, and when the face shield 10 is assembled on a PCB of a display module by a fastener, the first conductive layer 120 contacts the fastener, so that the first conductive layer 120, the fastener and the lamp surface of the PCB form an electromagnetic shielding mesh.
When the face shield 10 is assembled on the display module, the electromagnetic interference of the front surface of the display module (namely the lamp surface where the LED lamp is located) can be effectively reduced. When the display module is in operation, the interference electromagnetic waves radiated from the front surface of the PCB are transmitted to the conductive layer along the fastening piece, the conductive layer of the face mask 10 also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the face mask 10 and the interference electromagnetic waves radiated from the front surface of the PCB are opposite in direction and opposite in magnetic pole, and form convection with each other, so that partial electromagnetic waves are offset, and the effect of reducing electromagnetic interference is achieved.
In some embodiments, the first conductive layer 120 is a layer of metallic conductive paint. The metal conductive paint layer is directly formed on the substrate 110 in one or more of spraying, coating, printing and 3D printing, and of course, other forming methods are also possible as long as the metal conductive paint layer can be formed on the substrate 110.
In some embodiments, the mask 10 further includes a display layer 140, wherein the display layer 140 is black and disposed on the second end surface 113 to adjust a display effect of the mask 10 after disposing the conductive layer. The display layer 140 may be directly formed on the second end surface 113 of the substrate 110.
The mask 10 is provided with the first conductive layer 120, so that the mask 10 also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the mask 10 are opposite to the interference electromagnetic waves radiated from the front surface of the PCB and have opposite magnetic poles, so that the interference electromagnetic waves can be cancelled out, and the electromagnetic interference of the display module can be effectively reduced.
Referring to fig. 2, an embodiment of the present invention further provides a display module 20, where the display module 20 includes a bottom case 210, a PCB 220, LED beads 230, a fastener 240 and a cover 250, the PCB 220 is disposed on the bottom case 210, the array of LED beads 230 is arranged on the PCB 220, the face mask 250 is the face mask 10 of any one of the above embodiments, the LED lamp beads 230 pass through the lamp holes of the face mask 250 to be exposed out of the face mask 250, the base of the face shield 250 is further provided with a plurality of fixing holes, which can be arranged between four adjacent lamp holes, the fastening member 240 passes through the fastening hole to connect and fix the face shield 250 and the PCB 220, and the first conductive layer of the face shield 250 is in contact with the fastening member 240, an electromagnetic shielding mesh is formed between the first conductive layer and the fastener 240 and the lamp surface of the PCB 220.
In some embodiments, the fastener 240 is fixed to a side of the PCB board 220 facing away from the LED bead 230. In a specific embodiment, a bonding pad 221 is disposed on a side of the PCB 220 facing away from the LED bead 230 and around the perforation, and the fastener 240 is fixed to the bonding pad 221 by welding.
Referring to fig. 2 and 3, in one or more embodiments, the fastening member 240 includes a reverse-buckling pin 241, the reverse-buckling pin 241 is fixed on the PCB 220, and the mask 250 is fixedly connected to the PCB 220 through the reverse-buckling pin 241. The back-off needle 241 comprises a head 2411 and a tail 2413 which are oppositely arranged, the section width D1 of the head 2411 is smaller than the section width D2 of the tail 2413, the PCB 220 is provided with a perforation corresponding to the fixing hole and the back-off needle 241, the head 2411 of the back-off needle 241 penetrates through the perforation from one side of the PCB 220 departing from the LED lamp bead 230 and enters the fixing hole of the face shield 250, the face shield 250 is sleeved on the head 2411, the tail 2413 is fixedly connected to one side of the PCB 220 departing from the LED lamp bead 230, and therefore the face shield 250 is fixed on the PCB 220 through the back-off needle 241.
The face mask 250 is fixed to the head 2411 of the back-off pin 241 by a sleeving and buckling combination manner without using screws or other parts for fixing. Fixing face guard 250 through the mode of buckle, simultaneously with back-off pin 241 fixed connection in PCB board 220, compare the mode through screw fixing face guard 250, can avoid the damage to LED lamp pearl 230 when fixing face guard 250.
In a specific embodiment, the head 2411 is provided with an annular groove 2415, the annular groove 2415 is arranged along the circumference of the head 2411, the diameter of the fixing hole is smaller than the cross-sectional width of the head 2411, so that when the head 2411 penetrates into the fixing hole of the mask 250, the head 2411 and the mask 250 form a tight fit, finally, under the action of an external force, the mask 250 is sleeved on the position of the head 2411 corresponding to the annular groove 2415, and when the mask 250 is fixed, the first conductive layer of the mask 250 contacts with the side wall or the bottom of the annular groove 2415, so that an electromagnetic shielding mesh is formed among the lamp surface of the PCB 220, the inverted buckle needle 241 and the first conductive layer, and the electromagnetic shielding mesh plays a role in eliminating interfering electromagnetic waves.
The annular groove 2415 is disposed at one end of the head 2411 away from the tail 2413, the head 2411 includes a first portion 241a, a second portion 241b and a third portion 241c according to the position of the annular groove 2415, the first portion 241a is a portion of the head 2411 located between the annular groove 2415 and the tail 2413, the second portion 241b is a portion corresponding to the annular groove 2415, the third portion 241c is a portion of the head 2411 away from the tail 2413, and the first portion 241a and the third portion 241c are respectively located at two sides of the annular groove 2415, are disposed opposite to each other, and are connected by the second portion 241 b. The mask 250 is sleeved on the outer edge of the second portion 241b, and the diameter of the fixing hole of the mask 250 is smaller than the cross-sectional widths of the first portion 241a and the third portion 241 c. The diameter of the fixing hole may be smaller than or equal to the cross-sectional width of the second portion 241b, or larger than the cross-sectional width of the second portion 241b, as long as the first conductive layer of the mask 250 is in contact with the inverted needle 241 when the mask 250 is sleeved on the second portion 241 b. In a specific embodiment, to facilitate the assembly of the mask 250, the head 2411 is cylindrical, and the first portion 241a, the second portion 241b and the third portion 241c may be correspondingly cylindrical, and at this time, the cross-sectional widths of the first portion 241a, the second portion 241b and the third portion 241c are the diameters of the corresponding portions.
After the mask 250 is sleeved on the outer periphery of the second portion 241b, the first portion 241a is covered by the mask 250, and the third portion 241c is exposed out of the mask 250, so that the third portion 241c is similar to a bolt head when viewed from the appearance.
When the face mask 250 is sleeved in the annular groove 2415, firstly, the head 2411 of the inverted buckle needle 241 is aligned with the fixing hole, at this time, because the section width of the third part 241c is larger than the diameter of the fixing hole, the face mask 250 cannot be sleeved in the third part 241c, under the action of external force, the third part 241c penetrates into the fixing hole, the face mask 250 is deformed to be sleeved at the outer edge of the third part 241c, under the continuous action of the external force, the face mask 250 enters the annular groove 2415 along the third part 241c to be sleeved at the outer edge of the second part 241b, namely, the face mask 250 and the inverted buckle needle 241 are fixed. In some embodiments, to facilitate positioning of the mask 250 with the inverted spike 241, an end of the third portion 241c distal to the annular groove 2415 is provided with a ramp.
In a specific embodiment, the back-off pin 241 is made of stainless steel, so that it has high rigidity and is not prone to rusting. Further, in order to reduce the friction between the pin 241 and the mask 250, the surface of the pin 241 may be plated with nickel.
It can be understood by those skilled in the art that the implementation manner of the fastening member is not limited to the inverted pin 241, and it is only necessary to form a stable contact between the fastening member 241 and the first conductive layer of the face shield 250, and then form an electromagnetic shielding net between the first conductive layer of the face shield 250, the fastening member, and the lamp surface of the PCB. Illustratively, the screw may be specially processed to form an annular groove in the nut portion of the screw, so that the structure of the screw is similar to the head structure of the back-off pin 241, and the same effect may be achieved.
In some embodiments, the display module 20 further includes a potting adhesive layer disposed on the PCB 220, and the LED beads 230 are at least partially exposed from the potting adhesive layer. Through setting up the encapsulating glue layer, can avoid moisture to enter into on the PCB board 220, strengthened display module assembly 20's waterproof performance.
In the embodiment with the potting adhesive layer, the reverse buckling pin 241 is fixed on the PCB 220 first, and then the potting adhesive is performed on the PCB 220.
In the display module 20, the first conductive layer is disposed on the face shield 250, so that the face shield 250 also generates interfering electromagnetic waves, and the interfering electromagnetic waves generated by the face shield 250 and the interfering electromagnetic waves radiated from the front surface of the PCB 220 have opposite directions and opposite magnetic poles, so that the interfering electromagnetic waves can be cancelled out, and the electromagnetic interference of the display module 20 can be effectively reduced.
The invention further provides an LED display screen, which comprises a fixing frame and at least one display module, wherein the display module is fixed on the fixing frame, and the display module is the display module in any embodiment.
Above-mentioned LED display screen through set up first conducting layer at the face guard, makes the face guard also produce the interference electromagnetic wave, and the interference electromagnetic wave that the face guard produced and PCB board front surface radiation come out opposite direction, the magnetic pole is opposite, therefore can offset each other, and then effectual reduction display module's electromagnetic interference.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A display module is characterized by comprising a bottom shell, a PCB (printed circuit board), LED lamp beads, a fastener and a mask, wherein the PCB is arranged on the bottom shell, and the LED lamp bead array is arranged on the PCB;
the mask comprises a substrate and a first conducting layer, lamp holes are formed in the substrate and used for LED lamp beads to penetrate through, the substrate comprises a first end face and a second end face which are arranged oppositely, the first conducting layer is arranged on the first end face, the second end face is adjacent to the PCB, and the first end face is far away from the PCB;
the LED lamp beads penetrate through the lamp holes of the face mask to be exposed out of the face mask, and a plurality of fixing holes are further formed in the substrate of the face mask;
the fastener comprises an inverted buckle pin, and the inverted buckle pin comprises a head part and a tail part which are oppositely arranged; the tail part is fixedly connected to one side of the PCB, which is far away from the LED lamp bead; the head penetrates through the fixing hole, an annular groove is formed in the head, the mask is sleeved on the position, corresponding to the annular groove, of the head, a first conducting layer of the mask is in contact with the side wall or the bottom of the annular groove, the PCB, the inverted buckle pin and the first conducting layer are electrically connected, and an electromagnetic shielding net is formed between the first conducting layer and the lamp surface of the fastener and the PCB.
2. The display module of claim 1, wherein the cross-sectional width of the head portion is smaller than the cross-sectional width of the tail portion; the PCB is provided with a through hole corresponding to the fixing hole, and the head part penetrates through the through hole and the fixing hole of the mask from one side of the PCB, which is far away from the LED lamp panel; the PCB is provided with a pad at the periphery of the through hole, and the tail part is welded and fixed on the pad.
3. The display module assembly according to claim 1 or 2, wherein the head portion includes a first portion, a second portion and a third portion, the first portion is a portion of the head portion located between the annular groove and the tail portion, the second portion is a portion corresponding to the annular groove, the third portion is a portion of the head portion away from the tail portion, the first portion and the third portion are respectively located on two sides of the annular groove, are oppositely disposed, and are connected through the second portion, the mask is sleeved on an outer edge of the second portion, and a diameter of the fixing hole of the mask is smaller than cross-sectional widths of the first portion and the third portion.
4. The display module of claim 3, wherein the diameter of the fixing hole is smaller than or equal to the cross-sectional width of the second portion, or larger than the cross-sectional width of the second portion.
5. An LED display screen, characterized in that, includes a fixing frame and at least one display module, the display module is fixed on the fixing frame, the display module is the display module of any claim 1-4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855359.5A CN109118970B (en) | 2018-07-31 | 2018-07-31 | Face guard, display module assembly and LED display screen |
| PCT/CN2019/075703 WO2020024579A1 (en) | 2018-07-31 | 2019-02-21 | Mask, display module and led display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855359.5A CN109118970B (en) | 2018-07-31 | 2018-07-31 | Face guard, display module assembly and LED display screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109118970A CN109118970A (en) | 2019-01-01 |
| CN109118970B true CN109118970B (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810855359.5A Active CN109118970B (en) | 2018-07-31 | 2018-07-31 | Face guard, display module assembly and LED display screen |
Country Status (2)
| Country | Link |
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| CN (1) | CN109118970B (en) |
| WO (1) | WO2020024579A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109118970B (en) * | 2018-07-31 | 2021-09-24 | 深圳市奥拓电子股份有限公司 | Face guard, display module assembly and LED display screen |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020024579A1 (en) | 2020-02-06 |
| CN109118970A (en) | 2019-01-01 |
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Address after: 518000 1805, tower 2, Shenye Jinyuan Building, No.112, Qingshuihe 1st Road, Qingshuihe community, Luohu District, Shenzhen City, Guangdong Province Applicant after: SHENZHEN AOTO ELECTRONICS Co.,Ltd. Address before: 518000 9th Floor, United Headquarters Building, No. 63 Xuefu Road, Nanshan District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN AOTO ELECTRONICS Co.,Ltd. |
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