Display module integrated with NFC coil, display device and manufacturing method

Abstract

The present invention discloses a display module integrated with an NFC coil, a display device, and a manufacturing method. The display module in one embodiment includes a display area and a non-display area, and further includes a substrate and an NFC coil disposed on the substrate at a position corresponding to the non-display area and surrounding the display area. The NFC coil includes a signal input antenna, a signal output antenna, and a shaped coil and a main connection antenna that are alternately arranged and connected in series. The shaped coil is located on a side of the main connection antenna away from the display area. The main connection antenna at one end of the NFC coil close to the signal input antenna connects the shaped coil and the signal input antenna. The main connection antenna at one end of the NFC coil close to the signal output antenna connects the shaped coil and the signal output antenna. The maximum distance of the projection boundary of the projection formed by the main connection antenna in the non-display area is greater than the maximum distance of the projection boundary of the projection formed by any shaped coil in the non-display area.

Description

Technical Field

[0001] The present invention relates to the field of display technology. More specifically, it relates to a display module integrated with an NFC coil, a display device, and a manufacturing method thereof. Background Art

[0002] In the related art, services developed based on NFC (Near Field Communication) technology have gradually penetrated into all aspects of people's lives. For example, NFC is widely used in various fields such as electronic payment, identity authentication, electronic tickets, data exchange, information anti-counterfeiting, etc.

[0003] In current OLED consumer electronic products, the NFC signal transmitting device is often integrated on the customer host side. Such an external mounting method increases the body thickness of OLED products such as mobile phones and watches significantly, which is not conducive to the development of product thinness and lightness. Under the guidance of such consumer demand for thinness and lightness, integrating the NFC transmitting coil on the OLED module has emerged as the times require.

[0004] However, based on the manufacturing technologies of current major OLED panel manufacturers, when the NFC coil is integrated on the OLED module, due to the limitations of the Panel's shape and its own thickness, the magnetic induction signal intensity generated by the NFC coil winding is small. Once the OLED display module is assembled into a complete machine, it makes it almost impossible to receive the magnetic induction signal emitted by the coil on the back of the whole machine, thereby resulting in information transmission failure. Therefore, it is becoming increasingly urgent to design a solution that can enhance the magnetic induction intensity of NFC integration on the OLED module. Summary of the Invention

[0005] The purpose of the present invention is to provide a display module integrated with an NFC coil, a display device, and a manufacturing method thereof, so as to solve at least one of the problems existing in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The first aspect of the present invention provides a display module integrated with an NFC coil. The display module includes a display area and a non-display area surrounding the display area. The display module is characterized in that it further includes a substrate and an NFC coil disposed on the substrate corresponding to the non-display area and surrounding the display area.

[0008] The NFC coil includes:

[0009] A signal input antenna;

[0010] A signal output antenna; and

[0011] The shaped coils and the main connection antennas are alternately arranged and in series. The shaped coils are located on the side of the main connection antennas away from the display area. The main connection antennas at the ends of the NFC coil close to the signal input antenna connect the shaped coils and the signal input antennas. The main connection antennas at the ends of the NFC coil close to the signal output antenna connect the shaped coils and the signal output antennas.

[0012] The maximum distance of the projection boundary of the projection of the main connection antenna formed in the non-display area is greater than the maximum distance of the projection boundary of the projection of any of the shaped coils formed in the non-display area.

[0013] Further, the shaped coils between two adjacent main connection antennas include:

[0014] A first end close to the display area and connected to one of the main connection antennas;

[0015] A second end close to the display area and connected to the other main connection antenna. The first end and the second end are arranged to be disconnected.

[0016] The projection of the shaped coil formed in the non-display area is a convex structure in the direction from the display area to the non-display area.

[0017] The maximum distance of the projection boundary of the projection of each shaped coil formed in the non-display area is greater than the disconnection distance between the first end and the second end.

[0018] Further, the connection position of the first end and the main connection antenna is an arc structure.

[0019] The connection position of the second end and the main connection antenna is an arc structure.

[0020] Further, the projection of the main connection antenna in the non-display area is a circle with a first diameter;

[0021] The projection of the shaped coil in the non-display area is a circle with a second diameter;

[0022] The first diameter is greater than the second diameter.

[0023] The second diameter is greater than the disconnection distance between the first end and the second end;

[0024] Or

[0025] The projection of the main connection antenna in the non-display area is a square;

[0026] The distance between two opposite boundaries of the square projection of the main connection antenna is greater than the second diameter.

[0027] The second diameter is greater than the disconnection distance between the first end portion and the second end portion.

[0028] Furthermore, the projection of the shaped coil in the non-display area includes a straight boundary or a curved boundary, and the junction of two adjacent boundaries is arc-shaped.

[0029] and / or

[0030] When the projection of the shaped coil includes a straight boundary located on the side away from the display area and at a relative position to the disconnection of the first end portion and the second end portion, the length of the straight boundary is greater than the disconnection distance between the first end portion and the second end portion.

[0031] Furthermore, the projection of the main connection antenna in the non-display area is square.

[0032] The distance between two opposite boundaries of the square projection of the main connection antenna is greater than the distance between two opposite boundaries of the square projection of the shaped coil.

[0033] Furthermore, the total magnetic field of the display module is the sum of the magnetic fields of all the shaped coils and the magnetic field of the main connection antenna.

[0034] Furthermore, the boundary distance between adjacent shaped coils is greater than or equal to 5 μm;

[0035] The disconnection distance between the first end portion and the second end portion is greater than or equal to 10 μm.

[0036] The second aspect of the present invention provides a display device, including the display module of the first aspect of the present invention.

[0037] The third aspect of the present invention provides a method for manufacturing the display module of the first aspect of the present invention, including:

[0038] Forming a display area on the substrate;

[0039] Forming a non-display area surrounding the display area on the substrate;

[0040] An NFC coil is formed on the substrate in the non-display area and surrounding the display area. The NFC coil includes a signal input antenna, a signal output antenna; and a special-shaped coil and a main connection antenna that are alternately arranged and connected in series. The special-shaped coil is located on the side of the main connection antenna away from the display area. The main connection antenna near the signal input antenna at the end connects the special-shaped coil and the signal input antenna, and the main connection antenna near the signal output antenna at the end connects the special-shaped coil and the signal output antenna. The maximum distance of the boundary of the projection of the main connection antenna in the non-display area is greater than the maximum distance of the boundary of the projection of the special-shaped coil in the non-display area. Wherein, the NFC coil is arranged on the same layer as a metal layer in the display module.

[0041] The beneficial effects of the present invention are as follows:

[0042] In the display module integrated with the NFC coil according to the embodiment of the present invention, the NFC coil is integrated on the display module, which can reduce the overall thickness of the display module and achieve a thin and light design. The special-shaped coil at the end is connected to the signal input and output antennas through the main connection antenna, and the overall series performance of the NFC coil is realized by using the simple structure of the main connection antenna. And through the structural design of the NFC coil, the maximum distance of the projection boundary formed by the main connection antenna in the non-display area is set to be greater than the maximum distance of the projection boundary of any special-shaped coil in the non-display area, so as to improve the magnetic field strength of the display module. Description of the Drawings

[0043] The following further describes in detail the specific embodiments of the present invention with reference to the drawings.

[0044] Figure 1 A schematic structural diagram of an NFC coil showing the related art;

[0045] Figure 2 A schematic structural diagram of a thin film transistor showing an embodiment of the present invention;

[0046] Figure 3 A schematic structural diagram of an NFC coil showing an embodiment of the present invention;

[0047] Figure 4 A schematic diagram of the magnetic field of a circular current i in a three-dimensional coordinate system showing an embodiment of the present invention;

[0048] Figure 5 A schematic diagram of the arc-shaped structure at both ends of the special-shaped coil showing an embodiment of the present invention;

[0049] Figure 6 and Figure 7 Schematic diagrams of different structures of the special-shaped coil showing an embodiment of the present invention;

[0050] Figure 8 and Figure 9 Schematic diagram of the arc-shaped structure of each boundary of the special-shaped coil showing an embodiment of the present invention;

[0051] Figure 10 and Figure 11 Schematic diagrams of different structures of the main connection antenna in the non-display area showing an embodiment of the present invention

[0052] Figure 12 Schematic diagram of the structure of multiple NFC coils showing an embodiment of the present invention. Detailed implementation manners

[0053] To more clearly illustrate the present invention, the present invention will be further described below in conjunction with embodiments and drawings. Similar components in the drawings are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0054] As described above, the current NFC integrated design often has the problem that the emission intensity of the magnetic induction signal is insufficient, resulting in the failure of NFC near-field communication. The solution of integrating NFC on the OLED Panel has relatively large defects and thus cannot be widely applied in current consumer electronic products. Figure 1 Showing the design scheme of the NFC coil in the related art,

[0055] As Figure 1 shown, the NFC coil is a toroidal coil composed of multiple single-wire current in-phase coil windings. The radius of the innermost toroidal coil is R α , and the diameter is 2R α , the direction of the toroidal current i is Figure 1 the clockwise direction shown, and the direction of the induced magnetic field formed is into the paper surface. By increasing the number of coil turns outside the AA area of the display area (or outside the touch sensor layer, Touch Sensor layer), the enhancement of the induced magnetic field B is achieved, but the signal intensity of the magnetic induction generated by such a design is often small. Therefore, an embodiment of the present invention proposes a display module, a display device, and a manufacturing method integrating an NFC coil to solve the above problems.

[0056] The first embodiment of the present invention proposes a display module integrating an NFC coil, such as Figure 3 , Figures 5 to 11As shown, the display module includes a display area AA and a non-display area NA surrounding the display area AA. The display module further includes a substrate 11 and an NFC coil 12 disposed on the substrate 11 within the non-display area NA and surrounding the display area AA. In this embodiment, integrating the NFC coil 12 onto the display module can reduce the overall thickness of the display module and achieve a thin and light design.

[0057] In an alternative embodiment, the NFC coil 12 is disposed on the same layer as the metal layer of the display module. That is, when fabricating the various metal layers of the display module, a scheme of disposing it on the same layer as a certain metal layer can be adopted, and the NFC coil 12 surrounding the display area AA is formed on the non-display area NA using the same process.

[0058] Exemplarily, the display module includes a thin-film driving transistor 13 formed on the substrate 11. When the thin-film driving transistor is a top-gate structure, the structure of the thin-film driving transistor 13 is: an active layer 131 located on the substrate 11, a gate insulating layer 132 disposed on the active layer 131, a gate 133 disposed on the gate insulating layer 132, an interlayer dielectric layer 134 covering the gate 133, and a source-drain electrode layer 135 disposed on the side of the interlayer dielectric layer 134 away from the substrate 11 and connected to the active layer 131.

[0059] Exemplarily, the metal layer of the NFC coil 12 in this embodiment can be disposed on the same layer as the gate 133 or the source-drain electrode layer 135 of the thin-film driving transistor.

[0060] It should be noted that the display module of the embodiment of the present invention is not limited to a top-gate or bottom-gate structure. With the design criterion of disposing the NFC coil 12 on the same layer as the metal layer of the display module, it can be integrated into the display module, thereby simplifying the process flow and achieving a thin and light design of the display module.

[0061] As Figure 3 shown, the NFC coil 12 of the embodiment of the present invention includes:

[0062] A signal input antenna 121 for accessing a current signal;

[0063] A signal output antenna 122 for outputting a current signal;

[0064] Shaped coils 123 and main connection antennas 124 that are alternately arranged and connected in series.

[0065] Exemplarily, the signal input antenna 121 and the signal output antenna 122 are disposed in the bonding area of the non-display area NA. The signal input antenna 121 accesses the current signal of the host of the display module, and after flowing through the entire series-connected NFC coil 12, the current signal is output from the signal output antenna 122.

[0066] That is to say, although each part of the NFC coil is defined, in practical applications, the antennas of the NFC coil according to the embodiments of the present invention are arranged in series. That is, the signal input antenna 121, the signal output antenna 122, the alternately arranged and serially connected special-shaped coils 123, and the main connection antenna 124 form a complete NFC coil 12 in series.

[0067] In the embodiments of the present invention, the special-shaped coil 123 is located on the side of the main connection antenna 124 away from the display area AA. That is to say, as Figure 3 shown, the NFC coil 12 according to the embodiments of the present invention forms an annular NFC coil structure in which the main connection antenna 124 is located on the inner side close to the display area AA, and the special-shaped coil 123 is located on the outer side away from the display area AA.

[0068] In this embodiment, the antennas constituting the NFC coil 12 are designed in series. That is, the adjacent special-shaped coil 123 and the main connection antenna 124 are in a series structure. Further, at the end position of the NFC coil 12, in this embodiment, the main connection antenna 124 is used to connect the special-shaped coil 123, the signal input antenna 121, and the main connection antenna 124 is used to connect the special-shaped coil 123 and the signal output antenna 122 to form a continuous NFC coil 12.

[0069] In a specific embodiment, as Figure 3 shown, the main connection antenna 124a at the end of the NFC coil 12 close to the signal input antenna 121 connects the special-shaped coil 123 and the signal input antenna 121, and the main connection antenna 124b at the end of the NFC coil 12 close to the signal output antenna 122 connects the special-shaped coil 123 and the signal output antenna 122. That is to say, the path of the signal current entering the NFC coil 12 is the signal input antenna 121, the main connection antenna 124a at the end of the NFC coil 12 close to the signal input antenna 121, the special-shaped coil 123, the alternately arranged main connection antenna 124 and special-shaped coil 123, the main connection antenna 124b at the end of the NFC coil 12 close to the signal output antenna 122, and finally output through the signal output antenna 122.

[0070] In this embodiment, the main connection antenna 124 is used to connect the special-shaped coil 123 at the end and the signal input antenna 121 and the signal output antenna 122. The simple structure of the main connection antenna 124 is used to realize the overall series performance of the NFC coil, and avoid the phenomenon that the connection is blocked due to the complex structure of the special-shaped coil 123 when the special-shaped coil 123 is connected to the signal input and output antennas.

[0071] As Figure 3 、Figures 5 to 12 As shown, the maximum distance L1 of the projection boundary of the projection formed by the main connection antenna 124 in the non-display area NA is greater than the maximum distance L2 of the projection boundary of the projection formed by any one of the shaped coils 123 in the non-display area NA.

[0072] Specifically, the maximum distance of the projection boundary in this embodiment is determined based on the projection. Exemplarily, the main connection antenna 124 includes a plurality of main connection antenna boundaries, and the plurality of main connection antenna boundaries are located at different positions in the non-display area NA. The projection in the non-display area NA is a discontinuous annular structure, and the break points are the first end 123a and the second end 123b connected to the shaped coil 123. Therefore, for the main connection antennas 124 at different positions and in a relatively large number, in the embodiment of the present invention, the projection formed by the main connection antenna 124 is regarded as a whole, and the design is carried out with the maximum distance of the projection boundary of this projection, that is, Figure 3 taking the shown L1 as the maximum distance of the projection boundary of the main connection antenna 124. That is to say, in a specific example, when the projection formed by the main connection antenna 124 is a discontinuous circular structure, the maximum distance of the projection boundary of the projection formed by the main connection antenna 124 is the diameter of the circle.

[0073] In this embodiment, the shaped coil 123 is an annular structure arranged around the display area AA and connected to the main connection antenna 124. The maximum distance L2 of the projection boundary of the shaped coil 123 is determined according to the projection of one shaped coil 123 in the non-display area NA. That is, different from the overall projection of the annular structure formed by the main connection antenna 124, for the projection formed by one shaped coil 123 in the non-display area NA, the maximum distance L2 of its boundary is the maximum distance between the boundaries at the relative positions of this projection. As Figure 3 shown, when the projection of each shaped coil 123 in the non-display area NA is circular, the maximum distance of the projection boundary of the shaped coil 123 is the diameter of the circle.

[0074] Therefore, in this embodiment, the maximum distance L1 of the projection boundary of the projection formed by the main connection antenna 124 in the non-display area NA is set to be greater than the maximum distance L2 of the projection boundary of the projection formed by any one of the shaped coils 123 in the non-display area NA, which can effectively increase the magnetic field strength of the NFC coil. That is to say, for the display module in the embodiment of the present invention, the NFC coil is integrated into the display module, the process flow is simplified, and the thin and light design of the display module is realized. At the same time, through the structural design of the NFC coil, the magnetic field strength of the display module is improved.

[0075] In an optional embodiment, the total magnetic field of the display module is the sum of the magnetic field of the shaped coil 123 and the magnetic field of the main connection antenna 124, thereby realizing the design of enhancing the magnetic field of the display module.

[0076] In an alternative embodiment, as Figure 5 shown, the special-shaped coil 123 located between two adjacent main connection antennas 124 includes:

[0077] A first end portion 123a close to one side of the display area AA and connected to one of the main connection antennas 124a;

[0078] A second end portion 123b close to one side of the display area AA and connected to the other main connection antenna 124b. The first end portion 123a and the second end portion 123b are disconnected from each other.

[0079] The projection of the special-shaped coil 123 formed in the non-display area NA is a convex structure in the direction from the display area AA to the non-display area NA.

[0080] The maximum distance of the projection boundary of the projection of each special-shaped coil 123 formed in the non-display area NA is greater than the disconnection distance D1 between the first end portion 123a and the second end portion 123b.

[0081] As Figure 3 shown, the special-shaped coil 123 in the embodiment of the present invention is a partial circular structure. The first end portion 123a and the second end portion 123b of the special-shaped coil 123 are designed to be disconnected, thereby forming the partial circular structure of this embodiment.

[0082] The main connection antennas 124 and the special-shaped coils 123 in this embodiment are alternately arranged. Different main connection antennas 124 are arranged on both sides of one special-shaped coil 123. As Figure 3 shown, the first end portion 123a of the same special-shaped coil 123 is connected to the main connection antenna 124a on the left side, and the second end portion 123b of the same special-shaped coil 123 is connected to another main connection antenna 124b. In this connection, a scheme in which the first end portion 123a and the second end portion 123b are disconnected from each other is formed.

[0083] The special-shaped coil 123 in the embodiment of the present invention is a convex structure, and its convex direction is the direction away from the display area AA, that is, the direction from the display area AA to the non-display area NA. Through the structure formed by the above design, the special-shaped coil 123 and the main connection antenna 124 in the embodiment of the present invention form a series circuit. Moreover, the special-shaped coil 123 in the embodiment of the present invention is approximately a ring-shaped structure. On the basis of ensuring that the special-shaped coil 123 and the main connection antenna 124 can form a complete magnetic field circuit, this setting can also enable the special-shaped coil 123 itself to have good magnetic inductive performance, and further improve the overall magnetic inductive intensity of the display module.

[0084] In an alternative embodiment, the disconnection distance D1 between the first end portion 123a and the second end portion 123b is greater than or equal to 10 μm. That is, as Figure 3 the disconnection distance D1 shown min ≥ 10 μm. This disconnection distance D1 is obtained by considering the current process limit distance. In this setting, it can ensure that the first end portion 123a and the second end portion 123b are disconnected, avoiding the problem of overlap in the process due to the width of the coil itself and the problem of affecting the magnetic induction intensity of the display module.

[0085] Furthermore, in the embodiment of the present invention, the maximum distance of the projection boundary of the projection of each shaped coil 123 formed in the non-display area NA is greater than the disconnection distance D1 between the first end portion 123a and the second end portion 123b. Through this setting, the projection of each shaped coil 123 in the non-display area NA is approximately in a ring-shaped design. That is, when the maximum distance of the projection boundary is greater than the disconnection distance D1, the formed ring structure has a wide end and a narrow end. In this structure, the shaped coil 123 is approximately a complete ring structure, and the magnetic field intensity of the shaped coil 123 will be greater.

[0086] In an alternative embodiment, as Figure 3 shown, the projection of the main connection antenna 124 in the non-display area NA is a circle with a first diameter 2R α .

[0087] The projection of the shaped coil 123 in the non-display area NA is a circle with a second diameter .

[0088] In a specific example, the projections of the main connection antenna 124 and the shaped coil 123 are both circular structures. In this structure, the maximum distance of the projection boundary of the main connection antenna 124 is the first diameter 2R α , and the maximum distance of the projection boundary of the shaped coil 123 is the second diameter

[0089] It should be noted that the maximum distance of the projection boundary of the main connection antenna 124 in the embodiment of the present invention is not the maximum process distance of the main connection antenna 124. That is, the maximum distance of the projection boundary in the embodiment of the present invention is designed according to the display area AA of the display module. Exemplarily, the larger the display area AA, the larger the maximum distance L1 of the projection boundary of the main connection antenna 124. Similarly, the maximum distance of the projection boundary of the shaped coil 123 in the embodiment of the present invention is not the maximum process distance of the shaped coil 123. That is, the maximum distance of the projection boundary in the embodiment of the present invention is designed according to the non-display area NA of the display module. Exemplarily, the larger the non-display area NA, the larger the maximum distance L2 of the projection boundary of the shaped coil 123.

[0090] In an alternative embodiment, the maximum distance of the projection boundary of the irregular coil 123 is greater than or equal to 30 μm. This setting is obtained considering the current process limit distance, which can avoid the problem of overlap of the irregular coil 123 formed by the process due to the width of the coil itself, and avoid the problem of affecting the magnetic induction intensity of the display module. The specific maximum distance of the projection boundary can be designed according to actual applications and will not be elaborated here.

[0091] In an alternative embodiment, as Figure 3 shown, the first diameter 2R α is greater than the second diameter , thereby forming a double-ring structure of an inner ring and an outer ring composed of the main connection antenna 124 and the irregular coil 123. Moreover, the second diameter is greater than the disconnection distance D1 between the first end 123a and the second end 123b. On the basis of ensuring that the alternately arranged main connection antenna 124 and the irregular coil 123 are connected in series, the ring structure formed by the irregular coil 123 is further made more approximate to a closed ring, thereby increasing the magnetic induction intensity of the display module.

[0092] In an alternative embodiment, as Figure 7 shown, the boundary distance D2 between adjacent irregular coils 123 is greater than or equal to 5 μm. This setting is obtained considering the current process limit distance, which can avoid the problem of overlap of the irregular coil 123 formed by the process due to the width of the coil itself, ensure that the overall display module is of a ring design, and avoid the problem of affecting the magnetic induction intensity of the display module. The specific maximum distance of the projection boundary can be designed according to actual applications and will not be elaborated here.

[0093] In a specific example, taking the Figure 3 shown NFC coil 12 structure as an example, that is, when the projections of the main connection antenna 124 and the irregular coil 123 are circular structures, the magnetic field of the display module of this structure is: the sum of the magnetic field of the irregular coil 123 and the magnetic field of the main connection antenna 124.

[0094] Specifically, as Figure 4 shown, it represents that the magnitude of the magnetic field at point P at a distance l′ from the circular current coil in a three-dimensional coordinate system is

[0095] Figure 3 The left side represents the main connection antenna 124 with a radius of R α and a radius of Structural design of the NFC coil 12 with a combined design of a special-shaped coil 123. The current signal i enters from the signal input antenna on the left, passes through the alternately arranged main connection antenna 124 and the special-shaped coil 123, and finally flows out from the signal output antenna on the right. The magnetic field of the coil formed by the main connection antenna 124 is B α , the current signal i flows through each single special-shaped coil 123 in the Figure 3 clockwise direction shown and generates an induced magnetic field of the corresponding special-shaped coil 123 as Since the magnetic field direction generated by the special-shaped coil 123 is the same as that of the main coil of the main connection antenna 124, according to the principle of vector superposition, it can be known that the total magnetic field generated by the entire coil design is i is a positive integer, i ≤ n. That is, the magnetic field of the annular structure formed by the main connection antenna 124 and the sum of the individual magnetic fields of all the special-shaped coils 123.

[0096] In this embodiment, the magnetic field B of the coil formed by the main connection antenna 124 α The calculation formula is:

[0097]

[0098] The calculation formula for the induced magnetic field of a single special-shaped coil 123 :

[0099]

[0100] Based on the above formula, for the special-shaped coil 123β i The ratio of the electromagnetic field intensity generated by the main connection antenna 124α is:

[0101]

[0102] Based on the NFC coil 12 of the embodiment of the present invention, it can be seen that the radius of the main connection antenna 124 is much larger than the radius of the special-shaped coil 123, that is That is, the first diameter is much larger than the second diameter, that is, the projection boundary distance of the main connection antenna 124 is greater than the projection boundary distance of a single special-shaped coil 123. Since in the actual product design, the two often differ by two orders of magnitude (10 2 ), that is, the projection boundary distance of the main connection antenna 124 is at least 100 times greater than the projection boundary distance of a single special-shaped coil 123.

[0103] Therefore,

[0104] That is to say, the magnetic induction intensity of the special-shaped coil 123 in this embodiment is much greater than the magnetic induction intensity of the main connection antenna 124. Therefore, the above design also shows that the newly added multiple special-shaped coils 123β1, β2,... βi In the design of them, the magnetic fields they generate are all much larger than the magnetic field B generated around the main connection antenna 124 α .

[0105] According to the right-hand screw rule, the intensity of the NFC coil 12 in the embodiment of the present invention is the sum of the two. It can be seen that the magnetic field intensity B of the NFC coil 12 in the embodiment of the present invention all will also be increased by at least two orders of magnitude, greatly improving the magnetic field intensity of the display module.

[0106] As Figure 3 shown, when the shaped coil 123 is a circular structure, sharp ends are formed when the shaped coil 123 is connected to the main connection antennas 124 on both sides. This structure will cause an electrostatic discharge effect (ESD) to easily occur at the sharp points, affecting the overall performance of the display module.

[0107] In an alternative embodiment, as Figure 5 shown, the connection between the first end 123a and the main connection antenna 124a is arc-shaped, and the connection between the second end 123b and the main connection antenna 124b is arc-shaped. In a specific example, the connection is an arc chamfer, and the chamfer arc R1≥5μm. Through this setting, in the embodiment of the present invention, the connections of the two sides of the shaped coil 123 with the main connection antenna 124 are set as arc-shaped structures, which further improves the problem of possible electrostatic breakdown caused by electrostatic discharge at this position on the basis of increasing the magnetic induction intensity of the display module.

[0108] In an alternative embodiment, as Figure 6 shown, the projection of the shaped coil 123 in the non-display area NA includes a straight boundary or a curved boundary, and the junction of two adjacent boundaries is arc-shaped.

[0109] In this embodiment, the shape of the projection of the shaped coil 123 in the non-display area NA has different structures. For example Figure 3 shown, the shaped coil 123 is a complete arc-shaped structure, and for another example, the shaped coil 123 is Figure 6 shown as a square ring structure including multiple straight boundaries, and for another example, the shaped coil 123 is Figure 7 shown as a ring structure including both straight lines and arcs. That is to say, the embodiment of the present invention does not limit the specific structure of the shaped coil 123. With the design criterion that the shaped coil 123 and the main connection antenna 124 are alternately and serially arranged and the projection of the shaped coil 123 in the non-display area NA forms a ring structure, the shaped coil 123 can generate a magnetic induction effect.

[0110] Further, when the projection of the shaped coil 123 includes multiple boundaries and adjacent boundaries form intersections, for example Figure 6 as shown, the straight boundary 1231 and the straight boundary 1232 perpendicular to the straight boundary 1231 form an intersection point, Figure 6 as shown, multiple straight boundaries intersect to form a total of 4 intersection points A1, A2, A3, and A4. Another example is, for example Figure 7 as shown, the arc boundary 1233 and the straight boundary 1231 connecting the arc boundary 1233 form an intersection point. Under the above structural design, electrostatic discharge is likely to occur at the intersection point. Therefore, in the embodiments of the present invention, the intersection point is set as an arc structure, for example Figure 8 as shown and Figure 9 as shown, the structures at the corresponding positions are designed to be arc-shaped, thereby improving the electrostatic discharge problem at this position.

[0111] Further, in an alternative embodiment, the distance between the intersection position of two adjacent boundaries of the shaped coil 123 and the connection position of the first end 123a and the main connection antenna 124 is greater than or equal to the process limit distance, and the distance between the intersection position of two adjacent boundaries of the shaped coil 123 and the connection position of the second end 123b and the main connection antenna 124 is greater than or equal to the process limit distance, for example 5 μm.

[0112] That is to say, based on the foregoing embodiments, as Figure 8 shown, in this embodiment, the shaped coil 123 and the main connection antennas 124 on both sides are set as arc-shaped structures, that is, the connection between the first end 123a and the main connection antenna 124 on the left is arc-shaped, such as the arc structure at R1, and the connection between the second end 123b and the main connection antenna 124 on the right is arc-shaped to achieve the improvement of the electrostatic discharge problem. On this basis, in the embodiments of the present invention, the position where the shaped coil 123 forms a junction is designed to be arc-shaped to further improve the electrostatic discharge of the shaped coil 123, such as the arc structure between the straight boundary 1232 and the straight boundary 1234, or the arc structure at R2. Further, in the embodiments of the present invention, the distance D3 between the arc-shaped junction position of the shaped coil 123 near the first end 123a and the first end 123a is also designed, and the distance D3 between the arc-shaped junction position of the shaped coil 123 near the second end 123b and the second end 123b is designed to ensure that there is a buffer area between adjacent arc-shaped structures, further improving the electrostatic discharge at adjacent arc-shaped structures.

[0113] Moreover, this setting also takes into account the current process limit distance, which can avoid the problem of overlap of the irregular-shaped coil 123 formed by the process due to the width of the coil itself, ensure that the overall display module is in a ring design, and avoid the problem of affecting the magnetic induction intensity of the display module. The specific maximum distance of the projection boundary can be designed according to actual applications and will not be elaborated here.

[0114] In a specific example, as Figure 8 shown, the projection of the irregular-shaped coil 123 in the non-display area NA is a square ring structure, and each boundary is a straight boundary. Among them, Figure 8 at the intersection of the shown straight boundary 1231 and the straight boundary 1232 perpendicular to the straight boundary 1231, and at the intersection of the straight boundary 1231 and the second end 123b connecting the main connection antenna 124. In this embodiment, both intersections are designed to be arc-shaped, that is, the arc structures at R1 and R2. Moreover, the distance D3 between the two arc-shaped intersections is set to be lengthened, for example, such that it is greater than or equal to 5 μm.

[0115] In another specific example, as Figure 9 shown, the projection of the irregular-shaped coil 123 in the non-display area NA is an irregular projection, including an arc-shaped boundary 1233 and a straight boundary 1231. Among them, Figure 8 at the intersection of the shown arc-shaped boundary 1233 and the straight boundary 1231 connected to the arc-shaped boundary 1233, and at the intersection of the straight boundary 1231 and the second end 123b connecting the main connection antenna 124. In this embodiment, both intersections are designed to be arc-shaped, that is, the arc structures at R1 and R2. Moreover, the distance D3 between the two arc-shaped intersections is set to be lengthened, for example, such that it is greater than or equal to 5 μm. Therefore, through the above settings of the present invention, the magnetic induction intensity of the display module can be improved, and the electrostatic discharge problem of the display module can also be improved.

[0116] In an alternative embodiment, as Figure 8 shown, when the projection of the irregular-shaped coil 123 includes a straight boundary 1235 located on the side away from the display area AA and at a relative position to the disconnection between the first end 123a and the second end 123b, the length D4 of the straight boundary 1235 is greater than the disconnection distance D1 between the first end 123a and the second end 123b.

[0117] Based on the foregoing embodiments, it can be known that the display module of the embodiment of the present invention does not limit the specific shape of the irregular-shaped coil 123, but it is necessary to ensure that the irregular-shaped coil 123 is in a ring structure and can generate magnetic induction by itself. Therefore, the embodiment of the present invention designs the boundary length D4 and the disconnection distance D1 of one boundary of the irregular-shaped coil 123, as Figure 8As shown, the shaped coil 123 includes a plurality of straight boundaries. One of the straight boundaries 1235 is located on the side away from the display area AA and at a relative position corresponding to the disconnection between the first end 123a and the second end 123b. This straight boundary 1235 is disposed opposite to the disconnection. Therefore, when the length of the straight boundary 1235 is greater than the fracture distance of the disconnection, the shaped coil 123 presents an approximately closed series loop structure with different lengths, avoiding the appearance of a shape such as "П", that is, the disconnection distance D1 is equal to or greater than the straight boundary, thereby avoiding affecting the magnetic induction effect.

[0118] Based on the foregoing embodiments, the embodiments of the present invention design the shaped coil 123 and the ends at the connection positions between the two sides of the shaped coil 123 and the main connection antenna 124. In the following embodiments, the embodiments of the present invention design the main connection antenna 124.

[0119] In an alternative embodiment, as Figure 10 shown, the projection of the main connection antenna 124 in the non-display area NA is square, and the distance L1 between two opposite boundaries of the square projection of the main connection antenna 124 is greater than the second diameter The second diameter is greater than the disconnection distance D1 between the first end 123a and the second end 123b.

[0120] Taking the projection of the shaped coil 123 in the non-display area NA as a loop structure as an example, the projection of the main connection antenna 124 in the non-display area NA in this embodiment is square, that is, the projections of the shaped coil 123 and the main connection antenna 124 are of different shapes. In this structure, the projection area of the square projection of the main connection antenna 124 is still much larger than the projection area of a single shaped coil 123, that is, the distance L1 between two opposite boundaries of the square projection of the main connection antenna 124 is greater than the second diameter Through this setting, the magnetic field of the main connection antenna 124 and the magnetic field of the shaped coil 123 are formed, effectively improving the magnetic induction intensity of the display module.

[0121] In another alternative embodiment, as Figure 11 shown, the projection of the main connection antenna 124 in the non-display area NA is square, and the distance L1 between two opposite boundaries of the square projection of the main connection antenna 124 is greater than the distance L2 between two opposite boundaries of the square projection of the shaped coil 123.

[0122] Taking the projection of the special-shaped coil 123 in the non-display area NA as a square ring structure as an example, the projection of the main connection antenna 124 of this embodiment in the non-display area NA is square. That is, the projections of the special-shaped coil 123 and the main connection antenna 124 are approximate square structures. In this structure, the projection area of the square projection of the main connection antenna 124 is still much larger than the projection area of a single special-shaped coil 123. That is, the distance L1 between two opposite boundaries of the square projection of the main connection antenna 124 is greater than the distance L2 between two opposite boundaries of the square projection of the special-shaped coil 123. Through this setting, the magnetic field of the main connection antenna 124 and the magnetic field of the special-shaped coil 123 are formed, effectively improving the magnetic induction intensity of the display module.

[0123] The present invention Figure 10 and Figure 11 The magnetic field intensity of the display module shown can be designed according to the principle of the foregoing embodiment. That is, the total magnetic field intensity of the display module is equal to the sum of the magnetic field intensity formed by the main connection antenna 124 and the magnetic field intensities of all the special-shaped coils 123. And, based on the foregoing description, it can be known that the electromagnetic field intensity generated by the special-shaped coil 123 with the same current intensity I α and the electromagnetic field intensity B generated by the main connection antenna 124

[0124]

[0125] Therefore, when the distance between two opposite boundaries of the square projection of the main connection antenna 124 is much greater than the distance between two opposite boundaries of the square projection of the special-shaped coil 123, the special-shaped coil 123 has a very large magnetic induction intensity, further greatly improving the magnetic induction intensity of the display module.

[0126] It should be noted that the main connection antenna 124 of the display module in the embodiment of the present invention is not limited to Figures 5 to 12 the square or circular shape shown. That is, Figures 5 to 12 the main connection antenna 124 shown is only an exemplary illustration of the embodiment of the present invention. Similarly, the shape of the special-shaped coil 123 is also not limited to Figures 5 to 12 the square or circular shape shown. Taking the series connection of the special-shaped coil 123 and the main connection antenna 124 to complete the loop as the design criterion, those skilled in the art can set the structures of the main connection antenna 124 and the special-shaped coil 123 according to actual applications, which will not be elaborated here.

[0127] In an alternative embodiment, as Figure 12As shown, the display module includes a plurality of NFC coils 12 located in the non-display area NA. The centers of the NFC coils 12 are located at the same central point. In the direction from the display area AA to the non-display area NA, the projection boundary distance of the projection of the NFC coil 12 in the non-display area NA gradually increases. The magnetic field strength in this structure is the sum of the magnetic fields of all the NFC coils. The magnetic field strength of the display module according to the embodiment of the present invention is further improved by the plurality of NFC coils with a ring structure.

[0128] It should be noted that the number and size of the NFC coils are set according to the edge size of the non-display area and the size of the display area, which will not be elaborated here.

[0129] Another embodiment of the present invention provides a display device, which includes the display module of the foregoing embodiment of the present invention. The display device includes the liquid crystal display panel of the above embodiment. The display device according to the embodiment of the present invention can be any product or component that requires a liquid crystal display panel, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a vehicle-mounted display device, etc. The embodiments of the present invention are not limited thereto.

[0130] Another embodiment of the present invention provides a method for manufacturing the display module of the foregoing embodiment of the present invention. The method includes:

[0131] Form a display area AA on the substrate 11;

[0132] Form a non-display area NA surrounding the display area AA on the substrate 11;

[0133] Form an NFC coil 12 disposed in the non-display area NA and surrounding the display area AA on the substrate 11. The NFC coil 12 includes a signal input antenna 121, a signal output antenna 122; and a special-shaped coil 123 and a main connection antenna 124 that are alternately arranged and connected in series. The special-shaped coil 123 is located on the side of the main connection antenna 124 away from the display area AA. The main connection antenna 124 at the end close to the signal input antenna 121 connects the special-shaped coil 123 and the signal input antenna 121. The main connection antenna 124 at the end close to the signal output antenna 122 connects the special-shaped coil 123 and the signal output antenna 122. The maximum distance L1 of the projection of the main connection antenna 124 in the non-display area NA is greater than the maximum distance L2 of the projection of the special-shaped coil 123 in the non-display area NA. Among them, the NFC coil 12 is disposed on the same layer as a metal layer in the display module.

[0134] In a specific example, such as Figure 2As shown, take the example where the NFC coil 12 is disposed on the same layer as the metal layer in the driving thin film transistor 13. Exemplarily, the process of forming the thin film driving transistor 13 includes:

[0135] Form an active layer 131 on the substrate 11, form a gate insulating layer 132 covering the active layer 131 on the substrate 11, form a gate 133 on the gate insulating layer 132, form an interlayer dielectric layer 134 on the gate 133, and form the source and drain of the source-drain electrode layer 135 on the interlayer dielectric layer 134, where the source and drain are connected to the active layer 131 through vias. The driving thin film transistor 13 includes multiple metal layers. The NFC coil 12 in the embodiment of the present invention can be fabricated with any one of the metal layers using the same process. Exemplarily, when fabricating the gate 133, the process of fabricating the gate 133 can form the NFC coil 12 in the non-display area NA, realizing the integration design of the NFC coil 12 in the display module, which is beneficial to the thin and light design of the display module.

[0136] In the description of the present invention, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including an..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0137] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A display module integrated with an NFC coil, the display module including a display area and a non-display area surrounding the display area, characterized in that The display module further includes a substrate and an NFC coil disposed on the substrate corresponding to the non-display area and surrounding the display area. The NFC coil includes: A signal input antenna; A signal output antenna; and Shaped coils and main connection antennas that are alternately arranged and connected in series. The shaped coil is located on the side of the main connection antenna away from the display area. The main connection antenna at the end of the NFC coil close to the signal input antenna connects the shaped coil and the signal input antenna, and the main connection antenna at the end of the NFC coil close to the signal output antenna connects the shaped coil and the signal output antenna. The maximum distance of the projection boundary of the projection of the main connection antenna in the non-display area is greater than the maximum distance of the projection boundary of the projection of any of the shaped coils in the non-display area.

2. The display module according to claim 1, wherein The shaped coil located between two adjacent main connection antennas includes: A first end portion close to the display area and connected to one of the main connection antennas; A second end portion close to the display area and connected to the other main connection antenna. The first end portion and the second end portion are disconnected. The projection of the shaped coil in the non-display area is a convex structure in the direction from the display area to the non-display area. The maximum distance of the projection boundary of the projection of each shaped coil in the non-display area is greater than the disconnection distance between the first end portion and the second end portion.

3. The display module according to claim 2, wherein The connection position of the first end portion and the main connection antenna is an arc structure. The connection position of the second end portion and the main connection antenna is an arc structure.

4. The display module according to claim 2, wherein The projection of the main connection antenna in the non-display area is a circle with a first diameter; The projection of the shaped coil in the non-display area is a circle with a second diameter; The first diameter is greater than the second diameter. The second diameter is greater than the disconnection distance between the first end portion and the second end portion; Or The projection of the main connection antenna in the non-display area is a square; The distance between two opposite boundaries of the square projection of the main connection antenna is greater than the second diameter. The second diameter is greater than the disconnection distance between the first end portion and the second end portion.

5. The display module according to claim 2, wherein The projection of the shaped coil in the non-display area includes a straight boundary or a curved boundary, and the connection position of two adjacent boundaries is an arc structure. And / or When the projection of the shaped coil includes a straight boundary located on the side away from the display area and at the relative position of the disconnection between the first end portion and the second end portion, the length of the straight boundary is greater than the disconnection distance between the first end portion and the second end portion.

6. The display module according to claim 5, wherein The projection of the main connection antenna in the non-display area is a square. The distance between two opposite boundaries of the square projection of the main connection antenna is greater than the distance between two opposite boundaries of the square projection of the shaped coil.

7. The display module according to any one of claims 1 to 6, characterized in that, The total magnetic field of the display module is the sum of the magnetic fields of all the shaped coils and the magnetic field of the main connection antenna.

8. The display module according to any one of claims 2 to 6, characterized in that The boundary distance between adjacent shaped coils is greater than or equal to 5 μm; The disconnection distance between the first end and the second end is greater than or equal to 10 μm.

9. A display device, characterized in that, Comprising the display module according to any one of claims 1 to 8.

10. A method for manufacturing a display module according to any one of claims 1 to 8, characterized in that, Comprising: Forming a display area on the substrate; Forming a non-display area surrounding the display area on the substrate; Forming an NFC coil on the substrate, which is arranged in the non-display area and surrounds the display area. The NFC coil includes a signal input antenna and a signal output antenna; and alternately arranged and serially connected shaped coils and main connection antennas. The shaped coils are located on the side of the main connection antenna away from the display area. The main connection antenna on the side of the end close to the signal input antenna connects the shaped coil and the signal input antenna. The main connection antenna on the side of the end close to the signal output antenna connects the shaped coil and the signal output antenna. The maximum boundary distance of the projection of the main connection antenna in the non-display area is greater than the maximum boundary distance of the projection of the shaped coil in the non-display area. Wherein, the NFC coil is arranged on the same layer as a metal layer in the display module.

Images