Circuit board assembly, display assembly and assembling method therefor, and display device

A circuit board assembly includes a connection circuit board, a near field communication antenna and solders. The connection circuit board includes circuit board pads. The near field communication antenna is attached to the connection circuit board, and the near field communication antenna includes: an antenna coil, antenna pads electrically connected to the antenna coil, and through holes penetrating the antenna pads and disposed opposite to the circuit board pads. The solders are connected to the circuit board pads through the through holes.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national phase entry under 35 USC 371 of International Patent Application No. PCT/CN2021/123144, filed on Oct. 11, 2021, which claims priority to Chinese Patent Application No. 202011281093.1, filed on Nov. 16, 2020, which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present disclosure relates to the field of display technologies, and in particular, to a circuit board assembly, a display assembly and an assembling method therefor, and a display device.

BACKGROUND

With the development of technology, consumers have higher and higher demand for multi-functional electronic products, near field communication (NFC) technology thus comes into being. The NFC technology is a short-range high-frequency wireless communication technology, which allows electronic devices to perform non-contact point-to-point data transmission (within ten centimeters) and data exchange with each other. Therefore, the NFC technology is widely used in display devices (e.g., mobile phones) to realize functions such as electronic payment and data transmission.

SUMMARY

In a first aspect, some embodiments of the present disclosure provide a circuit board assembly. The circuit board assembly includes a connection circuit board, a near field communication antenna and solders. The connection circuit board includes circuit board pads. The near field communication antenna is attached to the connection circuit board, and the near field communication antenna includes: an antenna coil, antenna pads electrically connected to the antenna coil, and through holes penetrating the antenna pads and disposed opposite to the circuit board pads. The solders are connected to the circuit board pads through the through holes, so that the antenna pads are electrically connected to the circuit board pads, respectively.

In some embodiments, the antenna pads are disposed in a region surrounded by the antenna coil.

In some embodiments, the near field communication antenna includes: a first insulating layer, a first coil, a first carrying layer, a second coil, a second insulating layer, a first adhesive layer and a magnetic material layer that are stacked in sequence. A first end of the first coil is electrically connected to a first end of the second coil to constitute the antenna coil. Numbers of the circuit board pads, the antenna pads, the through holes and the solders each are two. The two antenna pads are both disposed on the first carrying layer, and are electrically connected to a second end of the first coil and a second end of the second coil in a one-to-one correspondence. The two through holes are disposed opposite to the two circuit board pads in a one-to-one correspondence, and each through hole penetrates the first carrying layer and a corresponding antenna pad in the two antenna pads. Each solder is connected to a corresponding circuit board pad in the two circuit board pads through a through hole in the two through holes. The circuit board assembly further includes a second adhesive layer disposed between the magnetic material layer and the connection circuit board.

In some embodiments, the near field communication antenna further includes a third insulating layer disposed on the first carrying layer, and the third insulating layer separates the two antenna pads.

In some embodiments, the antenna pads each include a first sub-pad located on a side of the first carrying layer away from the connection circuit board. The near field communication antenna further includes a fourth insulating layer covering each first sub-pad.

In some embodiments, the connection circuit board includes: a fifth insulating layer, a first conductive layer, a second carrying layer, a second conductive layer and a sixth insulating layer that are stacked in sequence. The circuit board pads are disposed on a surface of the second carrying layer proximate to the near field communication antenna.

In some embodiments, the connection circuit board further includes a first electromagnetic shielding layer and a second electromagnetic shielding layer. The first electromagnetic shielding layer is disposed on a side of the fifth insulating layer away from the second carrying layer, and the second electromagnetic shielding layer is disposed on a side of the sixth insulating layer away from the second carrying layer.

In some embodiments, the connection circuit board further includes a seventh insulating layer disposed on the second carrying layer, and the seventh insulating layer separates the two circuit board pads.

In some embodiments, the antenna pads each include a second sub-pad located on a side of the first carrying layer proximate to the connection circuit board. The connection circuit board further includes an eighth insulating layer formed by a portion of a material for forming the second adhesive layer, and the eighth insulating layer fills in a gap between the circuit board pads and second sub-pads.

In some embodiments, the antenna pads each include a first sub-pad located on a side of the first carrying layer away from the connection circuit board and a second sub-pad located on a side of the first carrying layer proximate to the connection circuit board. The near field communication antenna further includes a third insulating layer disposed on the first carrying layer; the third insulating layer includes an upper insulating layer disposed on a surface of the first carrying layer away from the connection circuit board, and a lower insulating layer disposed on a surface of the first carrying layer proximate to the connection circuit board; the upper insulating layer separates first sub-pads of the antenna pads, and the lower insulating layer separates second sub-pads of the antenna pads.

In some embodiments, the first coil and the first sub-pads of the antenna pads are located in a same layer and made of a same material; and the second coil and the second sub-pads of the antenna pads are located in a same layer and made of a same material.

In some embodiments, the circuit board pads and the first conductive layer are made of a same material.

In a second aspect, some embodiments of the present disclosure provide a display assembly including a display panel and the circuit board assembly according to any one of the embodiments in the first aspect. The near field communication antenna of the circuit board assembly is located on a back side of the display panel, a first end of the connection circuit board of the circuit board assembly is electrically connected to the display panel, and a second end of the connection circuit board is configured to be electrically connected to a main board.

In some embodiments, the display panel includes a panel body and a bending portion connected to a side of the panel body; the bending portion is configured such that a driver chip is disposed thereon, and an end of the bending portion is located on a back side of the panel body and bonded to the first end of the connection circuit board.

In some embodiments, the display panel is a flexible display panel integrated with a touch layer, and the display assembly further includes: a cover plate, a third adhesive layer, a polarizer, a fourth adhesive layer and a heat dissipation film that are stacked in sequence; the panel body is disposed between the fourth adhesive layer and the heat dissipation film.

In some embodiments, the display assembly further includes: a cover plate, a fifth adhesive layer, a touch layer, a polarizer, a sixth adhesive layer and a heat dissipation film that are stacked in sequence, and a touch circuit board. The panel body of the display panel is disposed between the sixth adhesive layer and the heat dissipation film. An end of the touch circuit board is bonded to the touch layer, and another end of the touch circuit board is bonded to the connection circuit board.

In a third aspect, some embodiments of the present disclosure provide a method for assembling the display assembly according to any one of the embodiments in the second aspect. The method includes: assembling the near field communication antenna with the connection circuit board to form the circuit board assembly before the first end of the connection circuit board is electrically connected to the display panel.

In some embodiments, assembling the near field communication antenna with the connection circuit board to form the circuit board assembly before the first end of the connection circuit board is electrically connected to the display panel includes, includes: bonding a chip on film to the display panel; and assembling the near field communication antenna with the connection circuit board to form the circuit board assembly before the first end of the connection circuit board is bonded to the chip on film.

In a fourth aspect, some embodiments of the present disclosure provide a display device. The display device includes: a housing, a main board and the display assembly according to any one of the embodiments in the second aspect. The main board, and the display panel and the circuit board assembly of the display assembly are all disposed inside the housing.

In some embodiments, the housing includes a front housing and a rear housing. The front housing includes: a second bottom wall, a second side wall located at a periphery of the second bottom wall, and a flange extending toward an outer side of the front housing. The flange is located on a side of the second side wall away from the second bottom wall. The rear housing includes a third bottom wall and a third side wall located at a periphery of the third bottom wall. The third side wall is stuck outside the second side wall and abuts against the flange.

DETAILED DESCRIPTION

Hereinafter, the terms such as “first” and “second” are used for descriptive purposes only, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined with “first” or “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, the terms “a plurality of”, “the plurality of” and “multiple” each mean two or more unless otherwise specified.

The phrase “applicable to” or “configured to” used herein means an open and inclusive expression, which does not exclude devices that are applicable to or configured to perform additional tasks or steps.

In addition, the phrase “based on” used is meant to be open and inclusive, since a process, step, calculation or other action that is “based on” one or more of the stated conditions or values may, in practice, be based on additional conditions or value exceeding those stated.

The term “about” or “substantially” as used herein includes a stated value and an average value within an acceptable range of deviation of a particular value. The acceptable range of deviation is determined by a person of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system).

A display device in embodiments of the present disclosure may be a display device having a near field communication antenna, such as a mobile phone or a smart watch, which is not specifically limited here.

A structure of the display device is described below by taking the mobile phone as an example, and a structure of a display device of other type may be arranged with reference to a structure of a circuit board assembly in the mobile phone provided in embodiments.

As shown inFIG.1,FIG.1is a front view of the display device (the mobile phone) in some embodiments of the present disclosure. The display device includes a housing200and a display assembly100disposed in the housing200. The housing200has a substantially rectangular shape. The reference sign b indicates a display area of the display device.

As shown inFIG.2,FIG.2is a section view taken along the line A-A inFIG.1. The housing200includes a first bottom wall210and a first side wall220disposed at an edge of the first bottom wall210. The display assembly100includes a cover plate1, a third adhesive layer21, a polarizer3, a fourth adhesive layer22, a display panel4and a heat dissipation film5that are stacked in sequence. The cover plate1is adhered to the first side wall220of the housing200through an adhesive P. The polarizer3, the display panel4and the heat dissipation film5are all disposed in a space formed by the housing200and the cover plate1. The display panel4is a flexible display panel integrated with a touch layer, so that there is no need to provide an additional touch panel. This helps reduce the stack thickness of the display assembly100.

The flexible display panel4may be an organic light-emitting diode (OLED) display panel, or may be other flexible display panel, which is not specifically limited here. The third adhesive layer21and the fourth adhesive layer22may both be optically clear adhesive (OCA) layers, but are not limited thereto. They may both be other adhesive layers capable of realizing adhesion.

The display assembly100further includes a chip on film (COF)9and a circuit board assembly6, and the circuit board assembly6includes the near field communication (NFC) antenna62and a connection circuit board63that are both located on a back side (i.e., a non-display side) of the display panel4. The NFC antenna62is in a shape of a plate and is attached between the heat dissipation film5and the connection circuit board63. The connection circuit board63may be a flexible printed circuit (FPC) board, or a common non-bendable circuit board, which is not specifically limited here.

As shown inFIG.2, the COF9includes a carrier film91and a driver chip (IC)92disposed on the carrier film91. One end of the carrier film91is bonded to the display panel4, and the other end of the carrier film91is bonded to a first end (the m1end as shown inFIG.2) of the connection circuit board63. The driver chip92is adhered to the heat dissipation film5through an adhesive tape c.

The display device further includes a main board7. The main board7is disposed inside the housing200and located on a side of the connection circuit board63away from the display panel4. A second end (the m2end as shown inFIG.2) of the connection circuit board63is electrically connected to the main board7through a connector a′.

As shown inFIGS.3and4,FIG.3is a diagram showing a state of the NFC antenna62being attached to the connection circuit board63on an attaching fixture300in some embodiments of the present disclosure, andFIG.4is a section view taken along the line B-B inFIG.3. The connection circuit board63has circuit board pads631, and a first positioning hole6301and a second positioning hole6302.

The NFC antenna62includes an antenna coil621and antenna pads622electrically connected to the antenna coil621. The antenna pad622has a substantially rectangular shape and is disposed opposite to a circuit board pad631. The NFC antenna62is further provided therein with a third positioning hole6201and a fourth positioning hole6202. The circuit board assembly6further includes a solder64disposed between the antenna pad622and the circuit board pad631, so that the antenna pad622is electrically connected to the circuit board pad631.

The solder64may be a solder paste or other solder64, which is not specifically limited here.

The attaching fixture300includes an attaching stage310, and a first positioning column320and a second positioning column330that are disposed on the attaching stage310. When the NFC antenna62is attached to the connection circuit board63, the first positioning hole6301and the second positioning hole6302in the connection circuit board63are respectively matched with the first positioning column320and the second positioning column330first, and then the third positioning hole6201and the fourth positioning hole6202in the NFC antenna62are respectively matched with the first positioning column320and the second positioning column330. As a result, the pre-alignment of the NFC antenna62and the connection circuit board63is achieved. Next, the solder64is coated between the antenna pad622and the circuit board pad631; then, pressure welding is performed on the antenna pad622of the NFC antenna62and the circuit board pad631of the connection circuit board63to ensure the conduction therebetween; and finally, an adhesive layer is provided between the NFC antenna62and the connection circuit board63to enable the two to be attached together.

However, the attachment of the NFC antenna62and the connection circuit board63needs to be achieved through a cooperation between the positioning holes in the NFC antenna62, the positioning holes in the connection circuit board63and the positioning columns of the attaching fixture300; and there are inevitably errors in sizes and positions between the first positioning hole6301and the third positioning hole6201, and between the second positioning hole6302and the fourth positioning hole6202. Thus, it affects the alignment accuracy of the NFC antenna62and the connection circuit board63, and is not conducive to the subsequent welding between the antenna pads622and the circuit board pads631.

As shown inFIGS.5and6,FIG.5is an expanded view of the circuit board assembly6and the display panel4in some embodiments of the present disclosure, andFIG.6is a section view taken along the line C-C inFIG.5. The NFC antenna62is attached to the connection circuit board63. The NFC antenna62includes: an antenna coil621, antenna pads622electrically connected to the antenna coil621, and through holes623penetrating the antenna pads622and disposed opposite to the circuit board pads631. The solder64is connected to the circuit board pad631through the through hole623, so that the antenna pad622is electrically connected to the circuit board pad631.

In the embodiments, the NFC antenna62may be assembled with the connection circuit board63through a surface mount technology (SMT) process. The through holes623in the antenna pads622are firstly captured by a charge coupled device (CCD) camera of a mounting equipment to be respectively aligned with the circuit board pads631; and then the solder64is injected into the through hole623in the antenna pad622, so that the solder64is connected to the circuit board pad631. As a result, the antenna pad622is soldered to the circuit board pad631, which ensures the electrical connection between the antenna pad622and the circuit board pad631. Finally, a region of the NFC antenna62other than the antenna pads622is adhered to the connection circuit board63, so that the two are attached to each other.

Since the NFC antenna62has the through hole623penetrating the antenna pad622, the CCD camera of the mounting equipment may be used to capture the through hole623in the antenna pad622during assembly, so as to realize the alignment of the through hole623and the circuit board pad631. In this way, it is not necessary to realize the alignment of the NFC antenna62and the connection circuit board63through the cooperation between the positioning holes and the positioning columns, thereby avoiding inaccurate alignment caused by the alignment through the cooperation between the positioning holes and the positioning columns. As a result, it not only improves the alignment accuracy of the NFC antenna62and the connection circuit board63, but also has no need to provide positioning holes in the NFC antenna62and the connection circuit board63, which saves the time for providing the positioning holes in the NFC antenna62and the connection circuit board63, and thus helps improve the assembly efficiency of the NFC antenna62and the connection circuit board63.

A diameter of the through hole623should not be too large and too small. In a case where the diameter of the through hole623is too small, the solder64cannot flow into the through hole623, which will increase the risk of pseudo soldering between the antenna pad622and the circuit board pad631. In a case where the diameter of the through hole623is too large, there will be too much space of the antenna pad622to be occupied. It has been found through research that, in a case where the diameter of the through hole623is 0.3 mm, it can not only ensure that the solder64flows into the through hole623smoothly, but also enable the through hole623not to occupy too much space.

The arrangement position of the antenna pads622of the NFC antenna62is not unique. In some embodiments, as shown inFIGS.5and6, the antenna pads622are disposed outside a region surrounded by the antenna coil621.

As shown inFIGS.7and8,FIG.7is an expanded view of the circuit board assembly6and the display panel4in some other embodiments of the present disclosure, andFIG.8is a section view taken along the line D-D inFIG.7. The antenna pads622are disposed in the region surrounded by the antenna coil621. By arranging the antenna pads622in the region surrounded by the antenna coil621, the antenna pads622may make full use of the space of the NFC antenna62, which helps reduce the space occupied by the NFC antenna62.

Structures of the NFC antenna62and the connection circuit board63are not unique. In some embodiments, the NFC antenna62is of a double-layer coil structure, and the connection circuit board63is of a double-layer circuit board structure. The specific structures are as follows.

As shown inFIGS.6and8, the NFC antenna62includes a first insulating layer624a, a first coil6211, a first carrying layer625, a second coil6212, a second insulating layer624b, a first adhesive layer626and a magnetic material layer627that are stacked in sequence. The connection circuit board63includes a first electromagnetic shielding layer632a, a fifth insulating layer633a, a first conductive layer634a, a second carrying layer635, a second conductive layer634b, a sixth insulating layer633b, and a second electromagnetic shielding layer632bthat are stacked in sequence. The circuit board assembly6further includes a second adhesive layer65disposed between the magnetic material layer627and the connection circuit board63.

As shown inFIGS.8,9and10,FIG.9is a top view of the connection circuit board63inFIG.7, andFIG.10is a top view of the NFC antenna62inFIG.7. The numbers of the circuit board pads631, the antenna pads622, the through holes623and the solders64each are two. Each circuit board pad631is disposed on a surface of the second carrying layer635proximate to the NFC antenna62; the two antenna pads622are both disposed on the first carrying layer625; and each antenna pad622includes a first sub-pad622alocated on a side of the first carrying layer625away from the connection circuit board63(a sub-pad located on a upper side of the first carrying layer625) and a second sub-pad622blocated on a side of the first carrying layer625proximate to the connection circuit board63(a sub-pad located on a lower side of the first carrying layer625).

The two through holes623are disposed opposite to the two circuit board pads631in a one-to-one correspondence, and each through hole623penetrates the first carrying layer625and a corresponding antenna pad622. Each solder64is connected to a corresponding circuit board pad631through a through hole623.

It will be noted that, when the NFC antenna62and the connection circuit board63are attached, the antenna pads622and the circuit board pads631are exposed. For example, as shown inFIGS.8and9, the connection circuit board63is provided therein with a first avoidance opening636, and a position of the first avoidance opening636corresponds to a position of the circuit board pads631, so that the circuit board pads631are exposed. As shown inFIGS.7and8, the NFC antenna62is provided therein with a second avoidance opening628and a third avoidance opening629. A position of the second avoidance opening628corresponds to a position of first sub-pads622aof the antenna pads622, so that the first sub-pads622aare exposed; and a position of the third avoidance opening629corresponds to a position of second sub-pads622bof the antenna pads622, so that the second sub-pads622bare exposed.

As shown inFIGS.6,8and11,FIG.11is a diagram showing a connection principle of the antenna coil621and the antenna pads622of the NFC antenna62in some embodiments of the present disclosure. A first end O1of the first coil6211is electrically connected to a first end O2of the second coil6212. For example, the electrical connection between the first end O1of the first coil6211and the first end O2of the second coil6212may be achieved through a via hole penetrating the first carrying layer625, so as to form the antenna coil621. A second end O3of the first coil6211and a second end O4of the second coil6212are electrically connected to the two antenna pads622in a one-to-one correspondence. That is, the first coil6211and the second coil6212are connected in series, and then two ends of the first coil6211and the second coil6212that are connected in series are electrically connected to the two antenna pads622in the one-to-one correspondence.

As shown inFIGS.6and8, the first insulating layer624a, the second insulating layer624b, the fifth insulating layer633aand the sixth insulating layer633beach may be a protective layer (an overlay).

As shown inFIG.8, the first coil6211and upper sub-pads (i.e., the first sub-pads622a) of the two antenna pads622may be formed by performing a patterning process including etching on a same conductive layer, and the second coil6212and lower sub-pads (i.e., the second sub-pads622b) of the two antenna pads622may be formed by performing a patterning process including etching on a same conductive layer (e.g., a copper layer). InFIGS.6and8, the reference sign d denotes a gap region where a material is removed.

The first carrying layer625and the second carrying layer635each may be made of polyimide (PI), but are not limited thereto. They may be made of other insulating base material.

The first adhesive layer626and the second adhesive layer65each may be an acrylic hot-melt adhesive layer, but are not limited thereto. They may be other adhesive layers that can realize adhesion.

The magnetic material layer627may be a ferrite layer, but is not limited thereto. The magnetic material layer627may be other magnetic material layer627.

The first electromagnetic shielding layer632aand the second electromagnetic shielding layer632bare used to protect a circuit of the connection circuit board63from electromagnetic interference of components such as the NFC antenna62. Of course, in a case where the connection circuit board63adopts other anti-electromagnetic interference measure, the first electromagnetic shielding layer632aand the second electromagnetic shielding layer632bmay not be provided.

The first conductive layer634aand the second conductive layer634beach may be a metal layer, e.g., a copper layer. The circuit board pad631and the first conductive layer634amay be made of a same material, or different materials, which is not specifically limited here.

In the embodiments, the antenna coil621is arranged to be of a two-layer structure (i.e., including the first coil6211and the second coil6212), which may enhance the strength of a signal generated by the antenna coil621and improve the communication effect of the NFC antenna62. The connection circuit board63is arranged as a double-layer circuit board, which increases the layout space of components of the connection circuit board63and facilitates the optimized layout of the components of the connection circuit board63.

Of course, the NFC antenna62is not limited to be of a double-coil structure, and the NFC antenna62may be arranged to be of a single-layer coil structure. That is, the second coil6212and the second insulating layer624bas shown inFIGS.6and8are removed. The connection circuit board63is also not limited to be of the double-layer circuit board structure, and the connection circuit board63may be arranged to be of a single-layer circuit board structure. That is, the second conductive layer634band the sixth insulating layer633bas shown inFIGS.6and8are removed.

In some embodiments, as shown inFIGS.6and8, the NFC antenna62further includes a third insulating layer624cdisposed on the first carrying layer625, and the third insulating layer624cseparates the two antenna pads622. In this way, the two antenna pads622may be better insulated, which greatly reduces the probability of a short circuit happened to the two antenna pads622.

The third insulating layer624cincludes an upper insulating layer6241cdisposed on a surface of the first carrying layer625away from the connection circuit board63, and a lower insulating layer6242cdisposed on a surface of the first carrying layer625proximate to the connection circuit board63. The upper insulating layer6241cis disposed in the second avoidance opening628and separates two first sub-pads622a, and the lower insulating layer6242cis disposed in the third avoidance opening629and separates two second sub-pads622b. The upper insulating layer6241cand the lower insulating layer6242ceach may be an insulating green oil layer, but are not limited thereto. They may be insulating layers of other types.

In some embodiments, as shown inFIGS.6and8, the NFC antenna62further includes a fourth insulating layer624d. The fourth insulating layer624dcovers each first sub-pad622a. By arranging the fourth insulating layer624d, it may not only prevent a short circuit between the two first sub-pads622a, but also protect the first sub-pads622aand prevent corrosion of water and oxygen.

As shown inFIG.8, the fourth insulating layer624dmay fill in the second avoidance opening628to cover each first sub-pad622a. The fourth insulating layer624dmay be an insulating adhesive layer (e.g., a fluorinated liquid layer), and the insulating adhesive layer may be coated through an adhesive dispensing process.

In some embodiments, as shown inFIGS.6and8, the connection circuit board63further includes a seventh insulating layer633cdisposed on the second carrying layer635. The seventh insulating layer633cis disposed in the first avoidance opening636and separates the two circuit board pads631. In this way, the circuit board pads631and the first conductive layer634amay be better insulated, which greatly reduces the probability of the short circuit happened between the two circuit board pads631.

The seventh insulating layer633cmay be an insulating green oil layer, but is not limited thereto. The seventh insulating layer633cmay also be an insulating layer of other type.

In some embodiments, as shown inFIGS.6and8, the connection circuit board63further includes an eighth insulating layer633dformed by a portion of a material for forming the second adhesive layer65. The eighth insulating layer633dfills in a gap between the circuit board pads631and the second sub-pads622b.

In the case where the NFC antenna62is attached to the connection circuit board63, the portion of the material for forming the second adhesive layer65overflows into the gap between the circuit board pads631and the second sub-pads622bunder pressing of the pressure. That is, the portion of the material for forming the second adhesive layer65overflows into the third avoidance opening629and the first avoidance opening636to form the eighth insulating layer633d. By arranging the eighth insulating layer633d, it may be possible to protect the circuit board pads631and the second sub-pads622b, so as to prevent the circuit board pads631and the second sub-pads622bfrom being corroded by external water and oxygen.

FIG.12is a partial section view of the display device according to some embodiments of the present disclosure. A main difference between the structure of the display device inFIG.12and the structure of the display device inFIG.2is that the first end of the connection circuit board63inFIG.12is directly bonded to the display panel4.

As shown inFIG.12, the display panel4is the flexible display panel integrated with the touch layer, and the display panel4includes a panel body41and a bending portion42connected to a side of the panel body41. The driver chip92is disposed on the bending portion42. The cover plate1, the third adhesive layer21, the polarizer3, the fourth adhesive layer22, the panel body41and the heat dissipation film5are stacked in sequence.

An end of the bending portion42is located on the back side (i.e., the non-display side) of the panel body41, and is bonded to the first end (the m1end inFIG.12) of the connection circuit board63.

In the embodiments, a bonding area in which the flexible circuit board is bonded is thus omitted on an edge of the panel body41, so that the size of a bezel of the display device may be reduced.

FIG.13is a partial section view of the display device according to some embodiments of the present disclosure. Main differences between the structure of the display device inFIG.13and the structure of the display device inFIG.12are that the panel body41and the touch layer25inFIG.13are arranged separately, and a structure of the housing200inFIG.13is different from a structure of the housing200inFIG.12.

As shown inFIG.13, the cover plate1, a fifth adhesive layer23, the touch layer25, the polarizer3, a sixth adhesive layer24, the panel body41and the heat dissipation film5are stacked in sequence. The display assembly100further includes a touch circuit board8, one end of the touch circuit board8is bonded to the touch layer25, and the other end of the touch circuit board8is bonded to the connection circuit board63.

The touch layer25and the polarizer3may be designed into one piece or separately designed, which is not specifically limited here. The fifth adhesive layer23and the sixth adhesive layer24may both be OCA layers, but are not limited thereto. They may be other adhesive layers capable of realizing adhesion.

The housing200includes a front housing230and a rear housing240. The front housing230includes a second bottom wall231and a second side wall232located at a periphery of the second bottom wall231. The front housing230further includes a flange233extending toward an outer side of the front housing230, and the flange233is located on a side of the second side wall232away from the second bottom wall231. The polarizer3, the touch layer25, the display panel4, the heat dissipation film5, the circuit board assembly6, and the touch circuit board8are all located inside the front housing230.

The rear housing240includes a third bottom wall241and a third side wall242located at a periphery of the third bottom wall241. The third side wall242is stuck outside the second side wall232and abuts against the flange233, so that the front housing230and the rear housing240are fastened together. An arrangement space250is formed between the second bottom wall231and the third bottom wall241, and the main board7is disposed in the arrangement space250. The second bottom wall231of the front housing230is provided with an opening therein, and the second end (the m2end inFIG.13) of the connection circuit board63extends into the arrangement space250through the opening and is electrically connected to the main board7. By arranging the housing200to be a structure in which the front housing230and the rear housing240are fastened together, it is convenient to disassemble and replace the main board7in the arrangement space250.

FIG.14is a partial section view of the display device according to some embodiments of the present disclosure. A main difference between the structure of the display device inFIG.14and the structure of the display device inFIG.13is that, the display panel inFIG.13is the flexible display panel4, while the display panel4in FIG.14is a liquid crystal display panel4.

As shown inFIG.14, the display assembly100includes the cover plate1, a seventh adhesive layer26, the touch layer25, an eighth adhesive layer27, an upper polarizer281, the display panel4, a lower polarizer282, a backlight source29and the circuit board assembly6that are disposed in sequence.

The backlight source29includes a backplane291, a light guide plate292disposed on a side of the backplane291, optical film(s)293disposed on a side of the light guide plate292proximate to the display panel4and a light source294disposed on a side of the light guide plate292.

The NFC antenna62is in the shape of the plate and is attached between the backplane291and the connection circuit board63.

The light source294may be a light-emitting diode (LED) lamp or a lamp tube, which is not specifically limited here. The seventh adhesive layer26and the eighth adhesive layer27may both be OCA layers, but are not limited thereto. They may be other adhesive layers capable of realizing adhesion.

Some embodiments of the present disclosure provide an assembling method for the display assembly100described in any of the above embodiments. The assembling method includes following steps as shown inFIG.15.FIG.15is a flow diagram of the assembling method for the display assembly100in the embodiments of the present disclosure.

In S1, as shown inFIG.8, the NFC antenna62is assembled with the connection circuit board63to form the circuit board assembly6.

The NFC antenna62may be assembled with the connection circuit board63through the SMT process. The through holes623in the antenna pads622are firstly captured by the CCD camera of the mounting equipment to be respectively aligned with the circuit board pads631; then the solder64is injected into the through hole623in the antenna pad622, so that the solder64is connected to the circuit board pad631, and the antenna pad622is soldered to the circuit board pad631; and finally, the region of the NFC antenna62other than the antenna pads622is adhered to the connection circuit board63by pressing. After the antenna pad622and the circuit board pad631are soldered, X-ray inspection is performed to ensure the soldering yield of the antenna pad622and the circuit board pad631.

The NFC antenna62is assembled with the connection circuit board63through the SMT process, which can not only achieve a relatively high alignment accuracy, but also precisely control the amount of the solder64injected into the through hole623in the antenna pad622to precisely control the height of the solder64, so that the electrical connection between the antenna pad622and the circuit board pad631can be achieved in a case where the height of the solder64is not more than 50 μm.

In S2, as shown inFIG.7, the first end of the connection circuit board63is electrically connected to the display panel4.

As shown inFIGS.12and13, the first end (the m1end inFIGS.12and13) of the connection circuit board63may be directly bonded to the display panel4to achieve electrical connection. In addition, as shown inFIGS.2and14, the first end of the connection circuit board63may be electrically connected to the display panel4indirectly. That is, the COF9is bonded to the display panel4, and then the first end of the connection circuit board63is bonded to the COF9, so that the first end of the connection circuit board63is electrically connected to the display panel4.

In the assembling method for the display assembly100, since the NFC antenna62is assembled with the connection circuit board63before the first end of the connection circuit board63is electrically connected to the display panel4, when the NFC antenna62is assembled with the connection circuit board63, it may avoid the damage to the display panel4caused by the assembly equipment, thereby improving the yield of the display assembly100.

The assembling method for other components in the display assembly100will not be repeated here.

For features described in the embodiments of the assembly method for the display assembly100that are the same as or similar to those of product embodiments of the display assembly100, reference may be made to the description in the product embodiments of the display assembly100, which will not be repeated here.

In the above description of the embodiments, specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.