WO2020024579A1 - 面罩、显示模组及led显示屏 - Google Patents

面罩、显示模组及led显示屏 Download PDF

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Publication number
WO2020024579A1
WO2020024579A1 PCT/CN2019/075703 CN2019075703W WO2020024579A1 WO 2020024579 A1 WO2020024579 A1 WO 2020024579A1 CN 2019075703 W CN2019075703 W CN 2019075703W WO 2020024579 A1 WO2020024579 A1 WO 2020024579A1
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WO
WIPO (PCT)
Prior art keywords
mask
display module
conductive layer
fastener
pcb board
Prior art date
Application number
PCT/CN2019/075703
Other languages
English (en)
French (fr)
Inventor
张奇
杨志军
吴能友
何昆鹏
吴振志
吴涵渠
Original Assignee
深圳市奥拓电子股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市奥拓电子股份有限公司 filed Critical 深圳市奥拓电子股份有限公司
Publication of WO2020024579A1 publication Critical patent/WO2020024579A1/zh

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to the field of display, in particular to a mask, a display module and an LED display screen.
  • the EMC certification (electromagnetic compatibility certification) of LED displays is an entry condition for LED displays to enter the market.
  • the EMC certification of indoor LED displays must meet the international safety certification standards.
  • the EMC certification standards for outdoor LED displays are far from enough.
  • a mask includes a base and a first conductive layer, the base is provided with a lamp hole for the LED lamp beads to pass through, and the base includes a first end surface and a second end surface opposite to each other, The first conductive layer is disposed on the first end surface.
  • the first conductive layer is a metal conductive paint layer.
  • a display layer is further included.
  • the display layer is black and is disposed on the second end surface for adjusting the display effect of the rear cover of the first conductive layer.
  • the above mask is provided with a first conductive layer, so that the mask also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the mask and the interference electromagnetic waves radiated from the front of the PCB board are in opposite directions and opposite magnetic poles, so they can cancel each other out, thereby effectively reducing the display module. Electromagnetic interference.
  • a second aspect of the present invention provides a display module including a bottom case, a PCB board, LED lamp beads, a fastener, and a mask.
  • the PCB board is disposed on the bottom case, and the LED lamp bead array is arranged.
  • the mask is any of the masks described above, the LED lamp beads are exposed to the mask through the lamp holes of the mask, and a plurality of fixing holes are also provided on the base of the mask.
  • the fastener passes through the fixing hole to connect and fix the mask and the PCB board, and a first conductive layer of the mask is in contact with the fastener, and the first conductive layer is in contact with the fastener.
  • An electromagnetic shielding net is formed between the fastener and the lamp surface of the PCB.
  • the fastener includes an inverted pin, the inverted pin is fixed on the PCB board, and the mask is fixedly connected to the PCB board through the inverted pin.
  • the barb needle includes a head and a tail portion opposite to each other, the tail portion is fixedly connected to the PCB board, the head portion is provided with a circular groove, and the mask is sleeved on the face plate.
  • the first conductive layer of the mask is in contact with the side wall or the bottom of the annular groove, so that An electromagnetic shielding network is formed between a conductive layer.
  • the tail portion is fixedly connected to a side of the PCB board facing away from the LED lamp beads.
  • the head includes a first portion, a second portion, and a third portion, and the first portion is a portion of the head between the annular groove and the tail, and the The second portion is a portion corresponding to the annular groove, the third portion is a portion of the head portion remote from the tail portion, and the first portion and the third portion are respectively located in the annular groove
  • the two sides are oppositely connected and connected by the second part, the mask is sleeved on the outer edge of the second part, and the diameter of the fixing hole of the mask is smaller than the cross section of the first part and the third part width.
  • a diameter of the fixing hole is smaller than or equal to a cross-sectional width of the second portion or larger than a cross-sectional width of the second portion.
  • a third aspect of the present invention provides an LED display screen, which comprises a fixing frame and at least one display module, the display module is fixed on the fixing frame, and the display module is any one of the above. Display module.
  • the display module and the LED display screen are provided with a first conductive layer on the mask, so that the mask also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the mask and the interference electromagnetic waves radiated from the front of the PCB board are in opposite directions and opposite magnetic poles, so they can cancel each other out. , Thereby effectively reducing the electromagnetic interference of the display module.
  • FIG. 1 is a schematic cross-sectional structure diagram of a mask according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional structure diagram of a display module according to an embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional structure diagram of an inverted pin of a display module according to an embodiment of the present invention.
  • FIG. 1 illustrates a schematic structural diagram of a mask 10 according to an embodiment of the present invention.
  • the mask 10 includes a base 110 and a first conductive layer 120.
  • the base 110 is provided with a light hole 110a.
  • the base 110 includes a first end surface 111 and a second end surface 113 opposite to each other.
  • the first conductive layer 120 is disposed on the first end surface 111.
  • the mask 10 When the mask 10 is mounted on a display module, it can effectively reduce the electromagnetic interference on the front surface of the display module (that is, the surface of the LED lamp).
  • the interference electromagnetic waves radiated from the front of the PCB board are transmitted to the conductive layer along the fastener, and the conductive layer of the mask 10 itself also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the mask 10 are radiated from the front of the PCB board.
  • the interference electromagnetic waves have opposite directions and opposite magnetic poles, forming convection with each other, thereby canceling out part of the electromagnetic waves and reducing the electromagnetic interference.
  • the first conductive layer 120 is a metal conductive paint layer.
  • the metal conductive paint layer is directly formed on the substrate 110, and the forming method may be one or more of spray coating, coating, printing, and 3D printing. Of course, it may also be other forming methods, as long as the The metal conductive paint can be formed on the substrate 110.
  • the mask 10 further includes a display layer 140.
  • the display layer 140 is black and is disposed on the second end surface 113 to adjust the display effect of the mask 10 provided with the conductive layer.
  • the display layer 140 may be directly formed on the second end surface 113 of the substrate 110.
  • the above-mentioned 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 and the interference electromagnetic waves radiated from the front surface of the PCB board are opposite to each other and have opposite magnetic poles, so they can cancel each other, which is effective Reduce the electromagnetic interference of the display module.
  • an embodiment of the present invention further provides a display module 20.
  • the display module 20 includes a bottom case 210, a PCB board 220, LED lamp beads 230, a fastener 240, and a mask 250.
  • the PCB The board 220 is disposed on the bottom case 210, the LED lamp beads 230 array is arranged on the PCB board 220, and the mask 250 is the mask 10 according to any one of the above embodiments, and the LED lamp beads 230 is exposed to the mask 250 through the lamp holes of the mask 250.
  • the base of the mask 250 is also provided with a plurality of fixing holes, and the fixing holes may be provided between four adjacent lamp holes.
  • the fastener 240 passes through the fixing hole to connect and fix the mask 250 and the PCB board 220, and a first conductive layer of the mask 250 is in contact with the fastener 240, and the first conductive layer is in the first conductive layer.
  • An electromagnetic shielding net is formed between the fastener 240 and the lamp surface of the PCB board 220.
  • the fastener 240 is fixed on a side of the PCB board 220 facing away from the LED lamp beads 230.
  • a pad 221 is provided on a side of the PCB board 220 facing away from the LED lamp beads 230 around the perforation, and the fastener 240 is fixed to the pad 221 by welding.
  • the fastener 240 includes a barb pin 241, the barb pin 241 is fixed on the PCB board 220, and the mask 250 passes through
  • the buckle pin 241 is fixedly connected to the PCB board 220.
  • the buckle pin 241 includes a head portion 2411 and a tail portion 2413 opposite to each other.
  • a cross-sectional width D1 of the head portion 2411 is smaller than a cross-sectional width D2 of the tail portion 2413.
  • the PCB board 220 corresponds to the fixing hole and the buckle.
  • the needle 241 is provided with a perforation.
  • the head 2411 of the inverted pin 241 passes through the perforation from the side of the PCB board 220 facing away from the LED lamp beads 230 and enters the fixing hole of the mask 250.
  • a mask 250 is sleeved on the head 2411, and the tail 2413 is fixedly connected to the side of the PCB board 220 facing away from the LED lamp beads 230, so that the mask 250 passes through the inverted pin 241 It is fixed on the PCB board 220.
  • the mask 250 is fixed to the head 2411 of the inverse pin 241 by a combination of a sleeve and a buckle, without the use of screws or other parts. Fixing the mask 250 by means of a buckle, and fixing the inverted pin 241 to the PCB board 220 at the same time, compared to fixing the mask 250 by means of screws, damage to the LED lamp beads 230 during fixing the mask 250 can be avoided.
  • the head 2411 is provided with an annular groove 2415.
  • the annular groove 2415 is provided along the circumferential direction of the head 2411.
  • the diameter of the fixing hole is smaller than the cross section of the head 2411. Width, so that when the head 2411 penetrates the fixing hole of the mask 250, the head 2411 and the mask 250 form a tight fit, and finally, under the action of external force, the mask 250 is sleeved on the mask 250 The position of the head 2411 corresponding to the annular groove 2415.
  • the first conductive layer of the mask 250 is in contact with the side wall or the bottom of the annular groove 2415.
  • An electromagnetic shielding net is formed between the lamp surface, the buckle pin 241 and the first conductive layer, which plays a role of eliminating interference electromagnetic waves.
  • the annular groove 2415 is disposed at an end of the head portion 2411 far from the tail portion 2413.
  • the head portion 2411 includes a first portion 241a, a second portion 241b, and a third portion.
  • a portion 241c, the first portion 241a is a portion of the head portion 2411 between the annular groove 2415 and the tail portion 2413, and the second portion 241b is a portion corresponding to the annular groove 2415
  • the third portion 241c is a portion of the head portion 2411 far from the tail portion 2413, and the first portion 241a and the third portion 241c are located on two sides of the annular groove 2415, respectively, and pass through The second portion 241b is connected.
  • the mask 250 is sleeved on an outer edge of the second portion 241b, and a diameter of a fixing hole of the mask 250 is smaller than a cross-sectional width of the first portion 241a and the third portion 241c.
  • the diameter of the fixing hole may be smaller than or equal to the cross-sectional width of the second portion 241b, or may be larger than the cross-sectional width of the second portion 241b.
  • the head portion 2411 is cylindrical, and the first portion 241a, the second portion 241b, and the third portion 241c may correspond to a cylindrical shape.
  • the first portion The cross-sectional width of 241a, the second portion 241b, and the third portion 241c is the diameter of the corresponding portion.
  • the first portion 241a is covered by the mask 250, and the third portion 241c is exposed from the mask 250, so that the third portion 241c is approximately a bolt head in appearance.
  • the head 2411 of the buckle pin 241 is first aligned with the fixing hole.
  • the mask 250 cannot be inserted into the third portion 241c.
  • the third portion 241c penetrates into the fixing hole, and the mask 250 sends deformation and is sleeved on the outer edge of the third portion 241c.
  • the mask 250 enters the annular groove 2415 along the third portion 241c, and is sleeved on the outer edge of the second portion 241b, that is, the mask 250 and the inverted pin 241 are fixed.
  • an end of the third portion 241c away from the annular groove 2415 is provided with a slope.
  • the buckle pin 241 is made of stainless steel, which has strong rigidity and is not easy to rust. Further, in order to reduce the friction between the barb needle 241 and the mask 250, the surface of the barb needle 241 may also be nickel-plated.
  • the implementation manner of the fastener is not limited to the buckle pin 241, it only needs to meet the requirement of forming a stable contact between the fastener 241 and the first conductive layer of the mask 250, and then the mask 250 An electromagnetic shielding net may be formed between the first conductive layer, the fastener, and the lamp surface of the PCB.
  • the screw can be specially processed to form a ring groove in the nut portion of the screw, so that the structure of the screw is similar to that of the head of the inverted pin 241, and the same effect can be achieved.
  • the display module 20 further includes a potting adhesive layer, the potting adhesive layer is disposed on the PCB board 220, and the LED lamp beads 230 are at least partially exposed from the potting adhesive layer. .
  • a potting adhesive layer By providing a potting adhesive layer, moisture can be prevented from entering the PCB board 220 and the waterproof performance of the display module 20 is enhanced.
  • the inverse pin 241 is first fixed on the PCB board 220, and then potting is performed on the PCB board 220.
  • the display module 20 is provided with a first conductive layer on the mask 250 so that the mask 250 also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the mask 250 and the interference electromagnetic waves radiated from the front surface of the PCB 220 are opposite to each other and have opposite magnetic poles. This can effectively reduce the electromagnetic interference of the display module 20.
  • the present invention also provides an LED display screen.
  • the LED display screen includes a fixing frame and at least one display module.
  • the display module is fixed on the fixing frame.
  • the display module is any one of the above embodiments.
  • the above-mentioned LED display screen is provided with a first conductive layer on the mask, so that the mask also generates interference electromagnetic waves, and the interference electromagnetic waves generated by the mask and the interference electromagnetic waves radiated from the front of the PCB board are in opposite directions and opposite magnetic poles, so they can cancel each other out, which is effective Reduce the electromagnetic interference of the display module.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • 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

一种面罩(10)、显示模组(20)及LED显示屏，该显示模组(20)及LED显示屏包括该面罩(10)。该面罩(10)包括基底(110)及第一导电层(120)，该基底(10)上设置有灯孔(110a)，以供LED灯珠(230)穿过，该基底(110)包括相对设置的第一端面(111)和第二端面(113)，该第一导电层(120)设置于该第一端面(111)上，当该面罩(10)通过紧固件(240)装配于显示模组(20)的PCB板(220)上时，该第一导电层(120)与该紧固件(240)接触，以使得该第一导电层(120)与该紧固件(240)、该PCB板(220)的灯面形成电磁屏蔽网。该面罩(10)、显示模组(20)及LED显示屏，通过设置第一导电层(120)，使面罩(10)也产生干扰电磁波，且面罩(10)产生的干扰电磁波与PCB板(220)正面辐射出来的干扰电磁波方向相反、磁极相反，因而能够相互抵消，进而有效的降低显示模组(20)的电磁干扰。

Description

面罩、显示模组及LED显示屏 技术领域
本发明涉及显示领域，特别是涉及面罩、显示模组及LED显示屏。
 背景技术
不管是在国内还是在国际，LED显示屏的EMC认证（电磁兼容性认证），都是LED显示屏进入市场的准入条件。随着近几年LED行业的发展，户内LED显示屏的EMC认证，都需要达到了国际安规认证的标准。但是对于户外LED显示屏，首先，使用环境相对较为宽松，其次，由于户外LED显示屏在结构上的局限性很难有所突破，就使户外LED显示屏的EMC认证标准还远远不够。
户外LED显示屏大都采用接地的方式来降低EMC，这种方式对于间距较大的显示屏来说可以满足，但是，对于间距较小的显示屏，则无法满足，这是因为小间距显示屏的PCB板的层数（VCC层）更多，灯板正面的辐射也会很大，接地的方式只能连接PCB板单侧的GND，而对于PCB板的正面辐射，则无能无力，此外，户外LED显示屏由于元器件密度大，产生的辐射电磁波也会大量的从灯面进行释放出来，这会严重影响到EMC的测试数据。
 技术问题
基于此，有必要针对LED显示屏的灯板正面的辐射电磁波对EMC测试造成影响的问题，提供一种面罩、显示模组及LED显示屏。
 技术解决方案
本发明第一方面提供一种面罩，包括基底及第一导电层，所述基底上设置有灯孔，以供LED灯珠穿过，所述基底包括相对设置的第一端面和第二端面，所述第一导电层设置于所述第一端面上，当所述面罩通过紧固件装配于显示模组的PCB板上时，所述第一导电层与所述紧固件接触，以使得所述第一导电层与所述紧固件、PCB板的灯面形成电磁屏蔽网。
在其中一个实施例中，所述第一导电层为金属导电漆层。
在其中一个实施例中，还包括显示层，所述显示层呈黑色，设置于所述第二端面上，用以调节设置所述第一导电层后面罩的显示效果。
上述面罩，通过设置第一导电层，使面罩也产生干扰电磁波，且面罩产生的干扰电磁波与PCB板正面辐射出来的干扰电磁波方向相反、磁极相反，因而能够相互抵消，进而有效的降低显示模组的电磁干扰。
本发明第二方面提供一种显示模组，包括底壳、PCB板、LED灯珠、紧固件及面罩，所述PCB板设置于所述底壳上，所述LED灯珠阵列的排布于所述PCB板上，所述面罩为上述任一所述的面罩，所述LED灯珠穿过所述面罩的灯孔外露于所述面罩，所述面罩的基底上还设置有若干固定孔，所述紧固件穿过所述固定孔将所述面罩与所述PCB板连接固定，且所述面罩的第一导电层与所述紧固件接触，在所述第一导电层与所述紧固件、PCB板的灯面之间形成电磁屏蔽网。
在其中一个实施例中，所述紧固件包括倒扣针，所述倒扣针固定于所述PCB板上，所述面罩通过所述倒扣针固定连接于所述PCB板。
在其中一个实施例中，所述倒扣针包括相对设置的头部和尾部，所述尾部固定连接于所述PCB板，所述头部设置有一环形凹槽，所述面罩套设于所述头部的与所述环形凹槽相对应的位置，所述面罩的第一导电层与所述环形凹槽的侧壁或底部接触，从而在所述PCB板的灯面、倒扣针及第一导电层之间形成电磁屏蔽网。
在其中一个实施例中，所述尾部固定连接于所述PCB板的背离所述LED灯珠的一侧。
在其中一个实施例中，所述头部包括第一部分、第二部分和第三部分，所述第一部分为所述头部的位于所述环形凹槽与所述尾部之间的部分，所述第二部分为与所述环形凹槽对应的部分，所述第三部分为所述头部的远离所述尾部的部分，所述第一部分与所述第三部分分别位于所述环形凹槽的两侧，相对设置，并通过所述第二部分连接，所述面罩套设于所述第二部分的外缘，且所述面罩的固定孔的直径小于所述第一部分及第三部分的截面宽度。
在其中一个实施例中，所述固定孔的直径小于等于所述第二部分的截面宽度，或大于所述第二部分的截面宽度。
本发明第三方面提供一种LED显示屏，其特征在于，包括固定架及至少一个显示模组，所述显示模组固定于所述固定架上，所述显示模组为上述任一所述的显示模组。
 有益效果
上述显示模组及LED显示屏，通过在面罩设置第一导电层，使面罩也产生干扰电磁波，且面罩产生的干扰电磁波与PCB板正面辐射出来的干扰电磁波方向相反、磁极相反，因而能够相互抵消，进而有效的降低显示模组的电磁干扰。
 附图说明
图1为本发明一实施例的面罩的剖面结构示意图；
图2为本发明一实施例的显示模组的剖面结构示意图；
图3为本发明一实施例的显示模组的倒扣针的剖面结构示意图。
 本发明的实施方式
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施方式。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施方式。相反地，提供这些实施方式的目的是使对本发明的公开内容理解的更加透彻全面。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本发明。本文所使用的术语“及／或”包括一个或多个相关的所列项目的任意的和所有的组合。
请参阅图1，图1示例性的示出了本发明一实施例面罩10的结构示意图，所述面罩10包括基底110及第一导电层120，所述基底110上设置有灯孔110a，以供LED灯珠穿过，所述基底110包括相对设置的第一端面111和第二端面113，所述第一导电层120设置于所述第一端面111上，当所述面罩10通过紧固件装配于显示模组的PCB板上时，所述第一导电层120与所述紧固件接触，以使得所述第一导电层120与所述紧固件、PCB板的灯面形成电磁屏蔽网。
所述面罩10装配于显示模组上时，能够有效的降低显示模组的正面（即LED灯所处的灯面）的电磁干扰。显示模组在工作时，PCB板正面辐射出来的干扰电磁波沿着紧固件传递到导电层，面罩10的导电层本身也产生干扰电磁波，且面罩10产生的干扰电磁波与PCB板正面辐射出来的干扰电磁波方向相反、磁极相反，彼此形成对流，从而抵消了部分电磁波，起到降低电磁干扰的作用。
在一些实施例中，所述第一导电层120为金属导电漆层。所述金属导电漆层直接成型于所述基底110上，成型的方式可以是喷涂、涂布、印刷、3D打印中的一种或多种，当然，也可以是其他的成型方式，只要能够将金属导电漆成型在基底110上即可。
在一些实施例中，所述面罩10还包括显示层140，所述显示层140呈黑色，设置于所述第二端面113上，用以调节设置导电层后面罩10的显示效果。所述显示层140可以直接成型于所述基底110的第二端面113上。
上述面罩10，通过设置第一导电层120，使面罩10也产生干扰电磁波，且面罩10产生的干扰电磁波与PCB板正面辐射出来的干扰电磁波方向相反、磁极相反，因而能够相互抵消，进而有效的降低显示模组的电磁干扰。
请参阅图2，本发明一实施例还提供一种显示模组20，所述显示模组20包括底壳210、PCB板220、LED灯珠230、紧固件240及面罩250，所述PCB板220设置于所述底壳210上，所述LED灯珠230阵列的排布于所述PCB板220上，所述面罩250为上述任一实施例所述的面罩10，所述LED灯珠230穿过所述面罩250的灯孔外露于所述面罩250，所述面罩250的基底上还设置有若干固定孔，所述固定孔可以设置于相邻的四个灯孔之间，所述紧固件240穿过所述固定孔将所述面罩250与所述PCB板220连接固定，且所述面罩250的第一导电层与所述紧固件240接触，在所述第一导电层与所述紧固件240、PCB板220的灯面之间形成电磁屏蔽网。
在一些实施例中，所述紧固件240固定于所述PCB板220的背离所述LED灯珠230的一侧。在具体的实施例中，所述PCB板220的背离所述LED灯珠230的一侧于所述穿孔的周边设置有焊盘221，所述紧固件240焊接固定于所述焊盘221。
请参阅图2及图3，在一个或多个实施例中，所述紧固件240包括倒扣针241，所述倒扣针241固定于所述PCB板220上，所述面罩250通过所述倒扣针241固定连接于所述PCB板220。所述倒扣针241包括相对设置的头部2411和尾部2413，所述头部2411的截面宽度D1小于所述尾部2413的截面宽度D2，所述PCB板220上对应所述固定孔及倒扣针241设置有穿孔，所述倒扣针241的头部2411从所述PCB板220的背离所述LED灯珠230的一侧穿过所述穿孔后，进入到所述面罩250的固定孔内，并将面罩250套设于所述头部2411，所述尾部2413固定连接于所述PCB板220的背离所述LED灯珠230的一侧，从而所述面罩250通过所述倒扣针241固定于PCB板220上。
所述面罩250通过套设与卡扣结合的方式固定于所述倒扣针241的头部2411，而无需使用螺丝或其他零件的配合完成固定。通过卡扣的方式固定面罩250，同时将倒扣针241固定连接于PCB板220，相比通过螺钉固定面罩250的方式，可以避免在固定面罩250时对LED灯珠230的损伤。
在具体的实施例中，所述头部2411设置有一环形凹槽2415，所述环形凹槽2415沿所述头部2411的周向设置，所述固定孔的直径小于所述头部2411的截面宽度，从而当所述头部2411穿入所述面罩250的固定孔时，所述头部2411与所述面罩250形成紧配合，最终在外力的作用下，所述面罩250套设于所述头部2411的与所述环形凹槽2415相对应的位置，当面罩250被固定时，面罩250的第一导电层与所述环形凹槽2415的侧壁或底部接触，从而在PCB板220的灯面、倒扣针241及第一导电层之间形成电磁屏蔽网，起到消除干扰电磁波的作用。
所述环形凹槽2415设置于所述头部2411的远离所述尾部2413的一端，根据所述环形凹槽2415所处位置，所述头部2411包括第一部分241a、第二部分241b和第三部分241c，所述第一部分241a为所述头部2411的位于所述环形凹槽2415与所述尾部2413之间的部分，所述第二部分241b为与所述环形凹槽2415对应的部分，所述第三部分241c为所述头部2411的远离所述尾部2413的部分，所述第一部分241a与所述第三部分241c分别位于所述环形凹槽2415的两侧，相对设置，并通过所述第二部分241b连接。所述面罩250套设于所述第二部分241b的外缘，且所述面罩250的固定孔的直径小于所述第一部分241a及第三部分241c的截面宽度。所述固定孔的直径可以小于等于所述第二部分241b的截面宽度，也可以大于所述第二部分241b的截面宽度，只要能够将面罩250套设于所述第二部分241b时，面罩250的第一导电层与倒扣针241相接触即可。在具体的实施例中，为了便于面罩250的装配，所述头部2411为圆柱形，所述第一部分241a、第二部分241b、第三部分241c均可对应为圆柱形，此时，第一部分241a、第二部分241b、第三部分241c的截面宽度即对应部分的直径。
面罩250套设于第二部分241b的外周后，第一部分241a被面罩250所遮盖，第三部分241c外露于所述面罩250，使得第三部分241c从外观上看去近似于一螺栓头。
将面罩250套入所述环形凹槽2415内时，首先将所述倒扣针241的头部2411对准固定孔，此时，由于第三部分241c的截面宽度大于固定孔的直径，因此面罩250不能套入第三部分241c，在外力的作用下，第三部分241c穿入固定孔内，面罩250发送形变而套设于所述第三部分241c外缘，在外力的持续作用下，面罩250沿着第三部分241c进入到所述环形凹槽2415内，套设于所述第二部分241b的外缘，即将面罩250与所述倒扣针241完成固定。在一些实施例中，为了便于面罩250与倒扣针241的定位，所述第三部分241c远离所述环形凹槽2415的一端设置有斜面。
在具体的实施例中，所述倒扣针241由不锈钢材质制成，在具有较强刚度的同时，又不易生锈。进一步，为了减少倒扣针241与面罩250之间的摩擦力，所述倒扣针241的表面还可以进行镀镍处理。
本领域技术人员可以理解的是，所述紧固件的实现方式不限于为倒扣针241，只需要满足紧固件241与面罩250的第一导电层之间形成稳定接触，进而在面罩250的第一导电层、紧固件及PCB板的灯面之间形成电磁屏蔽网即可。示例性的，可以对螺钉进行特殊的加工处理，在螺钉的螺帽部分加工形成一环形凹槽，进而使螺钉的结构与倒扣针241的头部结构类似，也可以实现同等的效果。
在一些实施例中，所述显示模组20还包括灌封胶层，所述灌封胶层设置于所述PCB板220上，所述LED灯珠230至少部分外露于所述灌封胶层。通过设置灌封胶层，可以避免水分进入到PCB板220上，增强了显示模组20的防水性能。
在设置有灌封胶层的实施例中，所述倒扣针241先固定于所述PCB板220上，再于PCB板220上进行灌胶。
上述显示模组20，通过在面罩250设置第一导电层，使面罩250也产生干扰电磁波，且面罩250产生的干扰电磁波与PCB板220正面辐射出来的干扰电磁波方向相反、磁极相反，因而能够相互抵消，进而有效的降低显示模组20的电磁干扰。
本发明还提供一种LED显示屏，所述LED显示屏包括固定架及至少一个显示模组，所述显示模组固定于所述固定架上，所述显示模组为上述任一实施例所述的显示模组。
上述LED显示屏，通过在面罩设置第一导电层，使面罩也产生干扰电磁波，且面罩产生的干扰电磁波与PCB板正面辐射出来的干扰电磁波方向相反、磁极相反，因而能够相互抵消，进而有效的降低显示模组的电磁干扰。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种面罩，其特征在于，包括基底及第一导电层，所述基底上设置有灯孔，以供LED灯珠穿过，所述基底包括相对设置的第一端面和第二端面，所述第一导电层设置于所述第一端面上，当所述面罩通过紧固件装配于显示模组的PCB板上时，所述第一导电层与所述紧固件接触，以使得所述第一导电层与所述紧固件、PCB板的灯面形成电磁屏蔽网。
  2. 根据权利要求1所述的面罩，其特征在于，所述第一导电层为金属导电漆层。
  3. 根据权利要求1所述的面罩，其特征在于，还包括显示层，所述显示层呈黑色，设置于所述第二端面上，用以调节设置所述第一导电层后面罩的显示效果。
  4. 一种显示模组，其特征在于，包括底壳、PCB板、LED灯珠、紧固件及面罩，所述PCB板设置于所述底壳上，所述LED灯珠阵列的排布于所述PCB板上，所述面罩为权利要求1-3任一项所述的面罩，所述LED灯珠穿过所述面罩的灯孔外露于所述面罩，所述面罩的基底上还设置有若干固定孔，所述紧固件穿过所述固定孔将所述面罩与所述PCB板连接固定，且所述面罩的第一导电层与所述紧固件接触，在所述第一导电层与所述紧固件、PCB板的灯面之间形成电磁屏蔽网。
  5. 根据权利要求4所述的显示模组，其特征在于，所述紧固件包括倒扣针，所述倒扣针固定于所述PCB板上，所述面罩通过所述倒扣针固定连接于所述PCB板。
  6. 根据权利要求5所述的显示模组，其特征在于，所述倒扣针包括相对设置的头部和尾部，所述尾部固定连接于所述PCB板，所述头部设置有一环形凹槽，所述面罩套设于所述头部的与所述环形凹槽相对应的位置，所述面罩的第一导电层与所述环形凹槽的侧壁或底部接触，从而在所述PCB板的灯面、倒扣针及第一导电层之间形成电磁屏蔽网。
  7. 根据权利要求6所述的显示模组，其特征在于，所述尾部固定连接于所述PCB板的背离所述LED灯珠的一侧。
  8. 根据权利要求6所述的显示模组，其特征在于，所述头部包括第一部分、第二部分和第三部分，所述第一部分为所述头部的位于所述环形凹槽与所述尾部之间的部分，所述第二部分为与所述环形凹槽对应的部分，所述第三部分为所述头部的远离所述尾部的部分，所述第一部分与所述第三部分分别位于所述环形凹槽的两侧，相对设置，并通过所述第二部分连接，所述面罩套设于所述第二部分的外缘，且所述面罩的固定孔的直径小于所述第一部分及第三部分的截面宽度。
  9. 根据权利要求8所述的显示模组，其特征在于，所述固定孔的直径小于等于所述第二部分的截面宽度，或大于所述第二部分的截面宽度。
  10. 一种LED显示屏，其特征在于，包括固定架及至少一个显示模组，所述显示模组固定于所述固定架上，所述显示模组为权利要求4-9任一项所述的显示模组。
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