CN114498014B - Display device - Google Patents
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- CN114498014B CN114498014B CN202210111837.8A CN202210111837A CN114498014B CN 114498014 B CN114498014 B CN 114498014B CN 202210111837 A CN202210111837 A CN 202210111837A CN 114498014 B CN114498014 B CN 114498014B
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- display panel
- flexible circuit
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- 238000004891 communication Methods 0.000 claims abstract description 81
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The disclosure provides a display device, belongs to the technical field of display, and solves the problem that an existing near field communication antenna occupies a large space. The display device of the present disclosure includes: a display panel having a light-emitting surface and a backlight surface; the flexible circuit board is electrically connected with the display panel; the near field communication antenna comprises at least one coil, at least part of the structure of the at least one coil is integrated on the flexible circuit board, and the coil on the flexible circuit board faces the display panel; the first magnetic field constraint structure is arranged on one side of the flexible circuit board, which is away from the display panel.
Description
Technical Field
The disclosure belongs to the technical field of display, and particularly relates to a display device.
Background
The near field communication technology (Near Field Communication, NFC) is a non-contact type identification and interconnection technology, adopts a near field magnetic field communication mode, has the characteristics of short transmission distance, low energy consumption, difficulty in signal interference and the like, and can perform near field wireless communication between mobile equipment and consumer electronic products.
Near field communication technology is commonly used for data exchange in electronic devices, and to use NFC communication technology, a communication antenna needs to be installed on the device for receiving and transmitting electromagnetic wave signals, and the communication antenna needs to occupy a relatively large space. The existing electronic devices using NFC technology mostly use an independent NFC communication module to be externally arranged on a motherboard of the electronic device, so that a large space is required to be occupied, which is not beneficial to the design of the device for lightening and thinning.
Disclosure of Invention
The present disclosure is directed to at least solving one of the technical problems in the prior art and providing a display device.
In a first aspect, an embodiment of the present disclosure provides a display device, including:
a display panel having a light-emitting surface and a backlight surface;
the flexible circuit board is electrically connected with the display panel;
the near field communication antenna comprises at least one coil, at least part of the structure of the at least one coil is integrated on the flexible circuit board, and the coil on the flexible circuit board faces the display panel;
the first magnetic field constraint structure is arranged on one side of the flexible circuit board, which is away from the display panel.
Optionally, a part of the structure of the at least one coil is integrated on the flexible circuit board, and another part of the structure is integrated on the display panel.
Optionally, the display device further includes a switching circuit board, and the display panel is connected with the flexible line board in a binding manner through the switching circuit board.
Optionally, the interposer includes a flip-chip thin film interposer.
Optionally, the flip chip film interposer has a first pad and a second pad, where the first pad is connected with the flexible circuit board in a binding manner, and the second pad is connected with the display panel in a binding manner;
the first magnetic field constraint structure is provided with an opening, and the first bonding pad is embedded in the opening.
Optionally, there is no overlap between the orthographic projection of the first pad on a horizontal plane and the orthographic projection of the coil on the horizontal plane.
Optionally, the display panel has a display portion, a back bend portion, and a bend portion connecting the display portion and the back bend portion; the display panel is also provided with a third bonding pad, the third bonding pad is arranged on one side of the back bending part close to the display part, and the third bonding pad is in binding connection with the flexible circuit board;
the first magnetic field constraint structure is provided with an opening, and the third bonding pad is embedded in the opening.
Optionally, there is no overlap between the orthographic projection of the third pad on the horizontal plane and the orthographic projection of the coil on the horizontal plane.
Optionally, the material of the first magnetic field confinement structure comprises ferrite.
Optionally, the display device further includes a heat dissipation layer disposed between the display panel and the flexible circuit board.
Optionally, the display device further includes a second magnetic field confinement structure, and the second magnetic field confinement structure is disposed between the display panel and the flexible circuit board.
Optionally, the display device further includes a heat dissipation layer, and the heat dissipation layer is disposed between the second magnetic field confinement structure and the flexible circuit board.
Optionally, the material of the second magnetic field confinement structure comprises ferrite.
Drawings
FIG. 1 is a schematic diagram of an exemplary display device;
FIG. 2 is a circuit diagram of a pixel;
fig. 3 is a top view of a display device before bending according to an embodiment of the disclosure;
FIG. 4 is a schematic cross-sectional view of the display device shown in FIG. 3 after bending;
FIG. 5 is a schematic cross-sectional view of another display device according to an embodiment of the disclosure;
FIG. 6 is a schematic view of the back structure of the display device shown in FIG. 5;
FIG. 7 is a schematic cross-sectional view of yet another display device according to an embodiment of the disclosure;
FIG. 8 is a schematic view of the back structure of the display device shown in FIG. 7;
FIG. 9 is a schematic cross-sectional view of yet another display device provided by an embodiment of the present disclosure;
FIG. 10 is a schematic view of the back structure of the display device shown in FIG. 9;
FIG. 11 is a schematic cross-sectional view of yet another display device provided by an embodiment of the present disclosure;
FIG. 12 is a schematic view of the back structure of the display device of FIG. 11;
fig. 13a is a schematic structural diagram of a display device after bending according to another embodiment of the disclosure;
FIG. 13b is a cross-sectional view of the display device of FIG. 13a taken along the direction A-A;
FIG. 14 is a schematic cross-sectional view of the display device of FIG. 13a after bending;
FIG. 15 is a schematic cross-sectional view of yet another display device provided by an embodiment of the present disclosure;
fig. 16 is a schematic cross-sectional view of still another display device provided in an embodiment of the disclosure.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present disclosure, the present disclosure will be described in further detail with reference to the accompanying drawings and detailed description.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As shown in fig. 1, in one example, the display device includes a display panel 11, a Chip On Film (COF) interposer, and a flexible circuit board 12 (FPCB; flexible Print Circuit Board). The display panel 11 is connected with the flexible circuit board 12 through the flip-chip film interposer 4. The display panel 11 has a display area Q1 and a peripheral area Q2. For example, a plurality of Gate lines (Gate lines) extending in the X direction and a plurality of Data lines (Data lines) extending in the Y direction are provided on the display panel 11. The plurality of gate lines are electrically connected to the driving circuit DC (Driving Circuit) in the peripheral region Q2. The plurality of gate lines and the plurality of data lines cross to define a plurality of Pixel regions, each of which has a Pixel P (Pixel) having an Organic Light Emitting element, such as an Organic Light Emitting Diode OLED (Organic Light-Emitting Diode). Since light emitted from the organic light emitting diode can be used to display an image, an area where a plurality of pixel areas are located is defined as a display area Q1. The peripheral region Q2 is disposed outside the display region Q1. For example, the peripheral region Q2 may surround the periphery of the display region Q1, and the peripheral region Q2 is not capable of displaying an image, and is a non-display region.
As shown in fig. 2, each pixel P includes a pixel circuit PC (Pixel Circuit) connected to the gate line GL and the data line DL of the pixel P and an organic light emitting diode OLED connected to the pixel circuit PC. The pixel circuit PC includes a driving Thin Film Transistor (TFT) Td, a switching Transistor Ts, and a storage capacitor Cst. The switching transistor Ts is connected to the gate line GL and the data line DL, and is configured to transmit a data signal received through the data line DL to the driving transistor Td according to a scan signal received through the gate line GL. The storage capacitor Cst is connected to the switching transistor Ts and the driving voltage line PL, and is configured to store a voltage corresponding to a difference between a voltage received from the switching transistor Ts and a driving voltage ELVDD supplied to the driving voltage line PL. The driving transistor Td is connected to the driving voltage line PL and the storage capacitor Cst, and may be used to control a driving current flowing from the driving voltage line PL to the organic light emitting diode OLED according to a voltage value stored in the storage capacitor Cst. The organic light emitting diode OLED may emit light having a desired brightness by driving a current. The organic light emitting diode OLED may emit, for example, red light, green light, blue light, or white light. Although the case where the pixel P includes two TFTs and one storage capacitor Cst is illustrated in fig. 2, exemplary embodiments of the present disclosure may employ different arrangements of transistors and memories. In other embodiments, the pixel circuit PC of the pixel P may include three or more transistors or two or more storage capacitors.
As shown in fig. 1, the display panel 11 further includes a first binding area Q3, and the first binding area Q3 is located at a side of the peripheral area Q2 away from the display area Q1. For example, as shown in fig. 1, a first bonding region Q3 is located on one side of the display region Q1, and a pad region is located at the first bonding region Q3, the pad region including a plurality of connection pads (or contact pads), each of which is configured to electrically connect a signal line extending from the display region Q1 or the peripheral region. The contact pads may be exposed at the surface of the first bonding region Q3, i.e., not covered by any layer, which facilitates electrical connection of the flip-chip interposer 4 for electrical connection to the flexible circuit board 12. The flexible circuit board 12 is electrically connected to an external controller and configured to transmit signals or power from the external controller. For example, the connection pads are electrically connected to the data link lines (the data link lines are electrically connected to the data lines in the display area Q1). The connection pads are electrically connected with the respective signal lines, so that mutual communication between the signal lines and the flexible circuit board can be realized. The number and arrangement of the connection pads are not particularly limited, and may be set according to actual needs. When the display device is assembled, the flip-chip film interposer 4 and the flexible circuit board 12 need to be folded to the back side of the display panel (the display side of the flexible display panel is usually default to the front side, and the side opposite to the display side is the back side or the back side), so that the space utilization rate can be improved, and the occupied area of the non-display area Q1 can be reduced.
NFC near field communication technology is generally used for data exchange in electronic devices, and to use NFC communication technology, a communication antenna needs to be installed on the device for receiving and transmitting electromagnetic wave signals, and the communication antenna needs to occupy a relatively large space. The existing electronic devices using NFC technology mostly use an independent NFC communication module to be externally arranged on a motherboard of the electronic device, so that a large space is required to be occupied, which is not beneficial to the design of the device for lightening and thinning.
In order to solve at least one of the above technical problems, the embodiments of the present disclosure provide a display device, and the display device provided by the embodiments of the present disclosure will be described in further detail below with reference to the accompanying drawings and detailed description.
Fig. 3 is a top view of a display device before bending, and fig. 4 is a schematic cross-sectional view of the display device shown in fig. 3 after bending, where the display device includes a display panel 11 having a light-emitting surface S1 and a backlight surface S2, a flexible circuit board 12, a near-field communication antenna 13, and a first magnetic field confinement structure 14, as shown in fig. 3 and fig. 4.
Specifically, the flexible circuit board 12 is electrically connected to the display panel 11 and then can be folded to the backlight surface S2 of the display panel 11. The near field communication antenna 13 includes a coil 131, and the coil 131 may have a one-turn or multi-turn structure, which is not limited herein. At least part of the coil 131 is integrated on the flexible circuit board 12, and the coil 131 on the flexible circuit board 12 faces the backlight surface S2. As shown in fig. 3, the coil 131 has a first lead terminal P1 and a second lead terminal P2, and the first lead terminal P1 and the second lead terminal P2 may be connected to a control circuit (not shown in the drawing) so that the near field communication antenna 13 forms a closed loop with the control circuit to complete near field communication. Alternatively, both the first lead terminal P1 and the second lead terminal P2 may be electrically connected to the control circuit by a jumper. The shape of the coil 131 may be selected according to the circumstances, and is not particularly limited herein, and the present embodiment is described by taking the coil 131 as a spiral shape. As shown in fig. 4, the first magnetic field confinement structure 14 is disposed on a side of the flexible circuit board 12 facing away from the display panel 11, wherein the material of the first magnetic field confinement structure 14 includes, but is not limited to, a magnetic material such as ferrite. The display panel 11 may be a flexible OLED display panel, or may be another flexible display panel, which is not specifically limited in this disclosure.
In this embodiment, the near field communication antenna 13 is integrated on the flexible circuit board 12 of the backlight side S2 of the display panel 11, so that the space occupied by the near field communication antenna 13 is effectively saved, the design of lightening and thinning of the display device is realized, and meanwhile, the first magnetic field constraint structure 14 is arranged on the side, away from the backlight side S2, of the flexible circuit board 12, so that the magnetic field of the near field communication antenna 13 is effectively constrained, the magnetic leakage is reduced, the magnetic flux of the near field communication antenna 13 is enhanced, and the performance of the NFC antenna is improved.
In order to make the specific structure of the display module according to the embodiments of the present disclosure clearer, the following description is made with reference to specific examples.
In some embodiments, fig. 5 is a schematic cross-sectional view of another display device provided in an embodiment of the disclosure, and fig. 6 is a schematic view of a back surface structure of the display device shown in fig. 5, and as shown in fig. 5 and 6, the display device includes a cover plate 10, a display panel 11 having a light-emitting surface S1 and a backlight surface S2, a flexible circuit board 12, a near field communication antenna 13, a first magnetic field confinement structure 14, and a controller 15.
Specifically, the display device further includes a transfer circuit board 121, and the embodiment is described taking the transfer circuit board 121 as a flip-chip film transfer board as an example, however, the transfer circuit board 121 may also be another circuit board, which is not limited herein. The display panel 11 is connected with the flexible line board 12 through the flip-chip film adapter plate 121 in a binding way. The near field communication antenna 13 comprises at least one coil 131, at least part of the structure of the at least one coil 131 is integrated on the flexible circuit board 12, and the coil 131 on the flexible circuit board 12 faces the backlight surface S2. The shape of the near field communication antenna 13 may be selected according to the situation, and is not specifically limited herein, and the near field communication antenna 13 has a spiral coil structure, and the number of turns of the coil in the spiral coil structure may be selected according to the situation, and is not specifically limited herein. The controller 15 is disposed on a side of the flip-chip interposer 121 near the backlight surface S2 of the display panel 11, and is configured to provide display signals or power for the display panel 11. As shown in fig. 6, the coil 131 has a third lead terminal P3 and a fourth lead terminal P4, and the third lead terminal P3 and the fourth lead terminal P2 may be connected to a control circuit (not shown in the drawing) through a via hole penetrating the flexible circuit board 12 and the first magnetic field confinement structure 14, so that the near field communication antenna 13 forms a closed loop with the control circuit to complete near field communication.
The flip-chip film interposer 121 has a first pad 16 and a second pad 17, where the first pad 16 is bonded to the flexible circuit board 12, and the second pad 17 is bonded to the display panel 11. The first magnetic field confinement structure 14 is disposed on a side of the flexible circuit board 12 facing away from the backlight surface S2, and an opening 141 is disposed on the first magnetic field confinement structure 14. In order to prevent the first bonding pad 16 from interfering with the magnetic field of the coil 13, there is no overlap between the orthographic projection of the first bonding pad 16 on the horizontal plane and the orthographic projection of the coil 13 on the horizontal plane, this embodiment is described taking the case that the first bonding pad 16 is located outside the pattern enclosed by the coil 131, and the first bonding pad 16 is embedded in the opening 141 and is bonded to the flexible circuit board 12. Wherein the material of the first magnetic field confinement structure 14 includes, but is not limited to, a magnetic material such as ferrite.
Among them, the coil 131 is made of copper including but not limited to molybdenum, silver, aluminum, copper, etc., and the preferable material of the coil 13 is copper because copper itself has a good conductive property and a small resistance. In some examples, the thickness of the traces in coil 131 is around 15 μm-35 μm and the line width is 100 μm-5mm.
In the embodiment of the disclosure, the near field communication antenna 13 is integrated on the flexible circuit board 12 of the backlight side S2 of the display panel 11, and the near field communication antenna 13 is not required to be separately arranged, so that the space occupied by the near field communication antenna 13 can be effectively saved, and the light and thin design of the display device can be realized. Meanwhile, the first magnetic field restraining structure 14 (ferrite layer) is arranged on one side, away from the backlight surface S2, of the flexible circuit board 12, and the ferrite has extremely high magnetic permeability and can induce a magnetic field generated by the near field communication antenna 13 to be transmitted in the ferrite, so that the magnetic field of the near field communication antenna 13 can be effectively restrained, magnetic leakage is reduced, the magnetic flux of the near field communication antenna 13 is further enhanced, and the NFC antenna performance is improved. Further, by providing the opening 141 in the first magnetic field confining structure 14, it is ensured that the first magnetic field confining structure 14 (ferrite layer) can be more smoothly bonded to the flexible wiring board 12.
In some embodiments, fig. 7 is a schematic cross-sectional view of still another display device according to an embodiment of the disclosure, and fig. 8 is a schematic view of a back surface structure of the display device shown in fig. 7, and as shown in fig. 7 and 8, the display device includes a cover plate 10, a display panel 11 having a light-emitting surface S1 and a backlight surface S2, a flexible circuit board 12, a near field communication antenna 13, a first magnetic field confinement structure 14, and a controller 15.
Specifically, the display device further includes a transfer circuit board 121, and the embodiment is described taking the transfer circuit board 121 as a flip-chip film transfer board as an example, however, the transfer circuit board 121 may also be another circuit board, which is not limited herein. The display panel 11 is connected with the flexible line board 12 through the flip-chip film adapter plate 121 in a binding way. The near field communication antenna 13 comprises at least one coil 131, at least part of the structure of the at least one coil 131 is integrated on the flexible circuit board 12, and the coil 131 on the flexible circuit board 12 faces the backlight surface S2. The shape of the near field communication antenna 13 may be selected according to the situation, and is not specifically limited herein, and the near field communication antenna 13 has a spiral coil structure, and the number of turns of the coil in the spiral coil structure may be selected according to the situation, and is not specifically limited herein. The controller 15 is disposed on a side of the flip-chip interposer 121 near the backlight surface S2 of the display panel 11, and is configured to provide display signals or power for the display panel 11. As shown in fig. 8, the connection between the lead terminal of the coil 131 and the control circuit is the same as that of the embodiment shown in fig. 6, and will not be described here again.
The flip-chip film interposer 121 has a first pad 16 and a second pad 17, where the first pad 16 is bonded to the flexible circuit board 12, and the second pad 17 is bonded to the display panel 11. The first magnetic field confinement structure 14 is disposed on a side of the flexible circuit board 12 facing away from the backlight surface S2, and an opening 141 is disposed on the first magnetic field confinement structure 14. In order to prevent the first bonding pad 16 from interfering with the magnetic field of the coil 13, there is no overlap between the orthographic projection of the first bonding pad 16 on the horizontal plane and the orthographic projection of the coil 131 on the horizontal plane, this embodiment is described taking the case that the first bonding pad 16 is located in the pattern enclosed by the coil 131, and the first bonding pad 16 is embedded in the opening 141 and is bonded to the flexible circuit board 12. Wherein the material of the first magnetic field confinement structure 14 includes, but is not limited to, a magnetic material such as ferrite.
In the embodiment of the disclosure, the near field communication antenna 13 is integrated on the flexible circuit board 12 of the backlight side S2 of the display panel 11, and the near field communication antenna 13 is not required to be separately arranged, so that the space occupied by the near field communication antenna 13 can be effectively saved, the design of lightening and thinning of the display device is realized, meanwhile, as the first magnetic field constraint structure 14 (ferrite layer) is arranged on one side of the flexible circuit board 12, which is away from the backlight side S2, the ferrite has extremely high magnetic permeability, the magnetic field generated by the near field communication antenna 13 can be induced to be transmitted in the ferrite, thereby effectively constraining the magnetic field of the near field communication antenna 13, reducing magnetic leakage, further enhancing the magnetic flux of the near field communication antenna 13, and improving the performance of the NFC antenna. Further, by providing the opening 141 in the first magnetic field confining structure 14, it is ensured that the first magnetic field confining structure 14 (ferrite layer) can be more smoothly bonded to the flexible wiring board 12.
Since the first bonding pad 16 is located in the pattern surrounded by the coil 131, the area of the coil 131 can be enlarged, so that the magnetic flux of the near field communication antenna 13 can be further enhanced, and the performance of the NFC antenna can be further improved.
In some embodiments, fig. 9 is a schematic cross-sectional view of still another display device provided in an embodiment of the disclosure, and fig. 10 is a schematic view of a back surface structure of the display device shown in fig. 9, where, as shown in fig. 9 and 10, the display device includes a cover plate 10, a display panel 11 having a light-emitting surface S1 and a backlight surface S2, a flexible circuit board 12, a near field communication antenna 13, a first magnetic field confinement structure 14, and a controller 15.
Specifically, the display panel 11 has a display portion 110, a bending portion 120, and a back bending portion 130, and the bending portion 120 is used to connect the display portion 110 and the back bending portion 130. The present embodiment is described taking the display portion 110, the bending portion 120, and the back bending portion 130 as an example. The controller 15 is disposed at the back bend 130 of the display panel 11 and configured to provide display signals or power to the display panel 11. The display panel 11 further includes a third pad 18, and the third pad 18 is disposed on a side of the back bend 130 near the display 110.
The near field communication antenna 13 comprises at least one coil 131, at least part of the structure of the at least one coil 131 is integrated on the flexible circuit board 12, and the coil 131 on the flexible circuit board 12 faces the backlight surface S2. The shape of the near field communication antenna 13 may be selected according to the situation, and is not specifically limited herein, and the near field communication antenna 13 has a spiral coil structure, and the number of turns of the coil in the spiral coil structure may be selected according to the situation, and is not specifically limited herein. The first magnetic field confinement structure 14 is disposed on a side of the flexible circuit board 12 facing away from the backlight surface S2, and an opening 141 is disposed on the first magnetic field confinement structure 14. In order to prevent the interference of the magnetic field of the coil 131 by the third pad 18, there is no overlap between the orthographic projection of the third pad 18 on the horizontal plane and the orthographic projection of the coil 131 on the horizontal plane, the present embodiment is described taking the case that the third pad 18 is located outside the pattern surrounded by the coil 131, and the third pad 18 is embedded in the opening 141 and is bonded to the flexible circuit board 12. Wherein the material of the first magnetic field confinement structure 14 includes, but is not limited to, a magnetic material such as ferrite. As shown in fig. 10, the connection between the lead terminal of the coil 131 and the control circuit (not shown) is the same as that used in the above embodiments, and will not be described again.
In the embodiment of the disclosure, the near field communication antenna 13 is integrated on the flexible circuit board 12 of the backlight side S2 of the display panel 11, and the near field communication antenna 13 is not required to be separately arranged, so that the space occupied by the near field communication antenna 13 can be effectively saved. Meanwhile, the first magnetic field restraining structure 14 (ferrite layer) is arranged on one side, away from the backlight surface S2, of the flexible circuit board 12, and the ferrite has extremely high magnetic permeability and can induce a magnetic field generated by the near field communication antenna 13 to be transmitted in the ferrite, so that the magnetic field of the near field communication antenna 13 can be effectively restrained, magnetic leakage is reduced, the magnetic flux of the near field communication antenna 13 is further enhanced, and the NFC antenna performance is improved. In addition, by providing the opening 141 in the first magnetic field confining structure 14 (ferrite layer), it is ensured that the first magnetic field confining structure 14 (ferrite layer) can be more smoothly attached to the flexible wiring board 12.
In some embodiments, fig. 11 is a schematic cross-sectional view of still another display device provided in an embodiment of the disclosure, and fig. 12 is a schematic view of a back surface structure of the display device shown in fig. 11, and as shown in fig. 11 and 12, the display device includes a cover plate 10, a display panel 11 having a light-emitting surface S1 and a backlight surface S2, a flexible circuit board 12, a near field communication antenna 13, a first magnetic field confinement structure 14, and a controller 15.
Specifically, the display panel 11 has a display portion 110, a bending portion 120, and a back bending portion 130, and the bending portion 120 is used to connect the display portion 110 and the back bending portion 130. The present embodiment is described taking the display portion 110, the bending portion 120, and the back bending portion 130 as an example. The controller 15 is disposed at the back bend 130 of the display panel 11 and configured to provide a display signal and a power signal to the display panel 11. As shown in fig. 12, the connection manner of the two lead terminals of the coil 131 and the control circuit is the same as that adopted in the above embodiments, and will not be described here again.
The near field communication antenna 13 comprises at least one coil 131, at least part of the structure of the at least one coil 131 is integrated on the flexible circuit board 12, and the coil 131 on the flexible circuit board 12 faces the backlight surface S2. The shape of the near field communication antenna 13 may be selected according to the situation, and is not specifically limited herein, and the near field communication antenna 13 has a spiral coil structure, and the number of turns of the coil in the spiral coil structure may be selected according to the situation, and is not specifically limited herein. The first magnetic field confinement structure 14 is disposed on a side of the flexible circuit board 12 facing away from the backlight surface S2, and an opening 141 is disposed on the first magnetic field confinement structure 14. In order to prevent the third pad 18 from interfering with the magnetic field of the coil 131, there is no overlap between the orthographic projection of the third pad 18 on the horizontal plane and the orthographic projection of the coil 131 on the horizontal plane. In the present embodiment, the third pad 18 is located in the pattern surrounded by the coil 131, and the third pad 18 is embedded in the opening 141 and is bonded to the flexible circuit board 12. Wherein the material of the first magnetic field confinement structure 14 includes, but is not limited to, a magnetic material such as ferrite.
In the embodiment of the disclosure, the near field communication antenna 13 is integrated on the flexible circuit board 12 of the backlight side S2 of the display panel 11, and the near field communication antenna 13 is not required to be separately arranged, so that the space occupied by the near field communication antenna 13 can be effectively saved. Meanwhile, the first magnetic field restraining structure 14 is arranged on one side, away from the backlight surface S2, of the flexible circuit board 12, and the ferrite has extremely high magnetic permeability, so that a magnetic field generated by the near field communication antenna 13 can be induced to be transmitted in the ferrite, the magnetic field of the coil 13 can be effectively restrained, magnetic leakage is reduced, the magnetic flux of the near field communication antenna 13 is further enhanced, and the performance of the NFC antenna is improved. Further, by providing the opening 141 in the first magnetic field confining structure 14, it is ensured that the first magnetic field confining structure 14 (ferrite layer) can be more smoothly bonded to the flexible wiring board 12.
Also, since the first bonding pad 16 is located in the pattern surrounded by the coil 13, the area of the coil 131 can be enlarged, so that the magnetic flux of the near field communication antenna 13 can be further enhanced, and the NFC antenna performance can be further improved.
In some embodiments, fig. 13a is a schematic structural diagram of a display device after bending according to another embodiment of the disclosure; FIG. 13b is a cross-sectional view of the display device of FIG. 13a taken along the direction A-A; fig. 14 is a schematic cross-sectional view of the display device shown in fig. 13a after bending, and as shown in fig. 13a, 13b and 14, the difference from the display device shown in fig. 3-4 is that the coil of the near field communication antenna 13 includes a first portion 131 and a second portion 132, wherein the first portion 131 is integrated on the flexible circuit board 12, the second portion 132 is integrated on the display panel 11, and the first portion 131 integrated on the flexible circuit board 12 is electrically connected to the second portion 132 located on the display panel 11. As shown in fig. 13a, the near field communication antenna 13 has a fifth lead terminal P5 and a sixth lead terminal P6, wherein the fifth lead terminal P5 may be connected to a control circuit (not shown) through a via (not shown) penetrating the display panel 11 and the flexible circuit board 12, and the sixth lead terminal P6 may be connected to the control circuit (not shown) through a via (not shown) penetrating the flexible circuit board 12, so that the near field communication antenna 13 and the control circuit may form a closed loop, thereby completing near field communication.
Alternatively, as shown in fig. 13b, the second portion 132 integrated on the display panel 11 is electrically connected with the first portion 131 integrated on the flexible wiring board 12 through a via penetrating the display panel 11.
With continued reference to fig. 13a, the second portion 132 of the coil 13 integrated on the display panel 11 may be a metal structure with a different layer from the gate lines GL and the data lines DL on the display panel 11, and a part of the metal line segments extending in the X direction in the second portion 132 are located between any adjacent gate lines GL, and a part of the metal line segments extending in the Y direction in the second portion 132 are located between any adjacent data lines DL, so that the aperture ratio of the display panel 11 is not affected by the near field communication antenna 13.
Alternatively, the second portion 132 of the coil 13 integrated on the display panel 11 may be a metal structure having the same layer as the gate line GL and the data line DL on the display panel 11, that is, a metal line segment extending partially in the X direction in the second portion 132 is disposed in the same layer as the gate line GL, and a metal line segment extending partially in the Y direction in the second portion 132 is disposed in the same layer as the data line DL; a metal line segment of the second portion 132 extending partially in the X direction is located between any adjacent gate lines GL, and a metal line segment of the second portion 132 extending partially in the Y direction is located between any adjacent data lines DL. In this way, on the one hand, the aperture ratio of the display panel 11 is not affected by the near field communication antenna 13, and on the other hand, the near field communication antenna 13, the gate line GL and the data line DL are arranged on the same layer, so that the processing steps can be reduced, and the manufacturing cost can be saved.
In some embodiments, fig. 15 is a schematic cross-sectional view of still another display device according to an embodiment of the disclosure, which is different from the display device shown in fig. 9 in that the display device shown in fig. 15 further includes a heat dissipation layer 100, and the heat dissipation layer 100 is disposed between the display panel 11 and the flexible circuit board 12. For example, the heat dissipation layer 100 may be adhered between the display panel 11 and the flexible wiring board 12 by glue. Of course, the heat dissipation layer 100 may be fixed in other manners, which is not specifically limited herein. In the present embodiment, by providing the heat dissipation layer 100 between the display panel 11 and the flexible wiring board 12, the heat dissipation efficiency of the flexible wiring board can be improved. It should be noted that, in this embodiment, the heat dissipation layer 100 is only provided in the display device shown in fig. 9 as an example, and it is understood that the heat dissipation layer 100 may be provided to improve the heat dissipation efficiency of the flexible circuit board 12 in other embodiments of the present disclosure, which is not illustrated here.
In some embodiments, the display device may further include a second magnetic field confinement structure, which may be disposed between the display panel and the flexible circuit board. Wherein the material of the second magnetic field confinement structure includes, but is not limited to, ferrite material.
In this embodiment, the second magnetic field confinement structure may be disposed between the display panel and the flexible circuit board, so that the magnetic field generated by the near field communication antenna may be induced to be transmitted in the ferrite, so that the magnetic field may be prevented from radiating to the display panel, and the magnetic flux leakage of the coil magnetic field may be further reduced, thereby further enhancing the magnetic flux of the near field communication antenna.
In some embodiments, fig. 16 is a schematic cross-sectional view of still another display device provided in an embodiment of the disclosure, which is different from the display device shown in fig. 15 in that the display device shown in fig. 16 further includes a second magnetic field confinement structure 200 and a heat dissipation layer 100, the second magnetic field confinement structure 200 is disposed between the display panel 11 and the flexible circuit board 12, and the heat dissipation layer 100 is disposed between the second magnetic field confinement structure 200 and the flexible circuit board 12. The display panel 11 and the second magnetic field confinement structure 200, the second magnetic field confinement structure 200 and the heat dissipation layer 100, and the heat dissipation layer 100 and the flexible circuit board 12 may be fixed by an adhesive, however, other manners may be adopted, and the present invention is not limited thereto. The material of the second magnetic field confinement structure includes, but is not limited to, a magnetic material such as ferrite. In this embodiment, by providing the second magnetic field confinement structure (ferrite layer), the ferrite has extremely high magnetic permeability, so that the magnetic field generated by the near field communication antenna 13 can be induced to be transmitted in the ferrite, the magnetic field can be prevented from radiating to the display panel 11, and the magnetic leakage of the coil magnetic field can be further reduced, thereby further enhancing the magnetic flux of the near field communication antenna 13 and improving the performance of the NFC antenna. It should be noted that, in this embodiment, the display device shown in fig. 15 is further provided with the second magnetic field confinement structure 200 as an example, and it is understood that in other embodiments of the present disclosure, the second magnetic field confinement structure 200 may be provided to reduce magnetic field leakage of the coil 13, which is not illustrated here.
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.
Claims (12)
1. A display device, comprising:
a display panel having a light-emitting surface and a backlight surface;
the flexible circuit board is electrically connected with the display panel;
the near field communication antenna comprises at least one coil, at least part of the structure of the at least one coil is integrated on the flexible circuit board, and the coil on the flexible circuit board faces the display panel;
the first magnetic field constraint structure is arranged on one side of the flexible circuit board, which is away from the display panel;
the display panel is provided with a display part, a back bending part and a bending part, wherein the bending part is used for connecting the display part and the back bending part; the display panel is also provided with a third bonding pad, the third bonding pad is arranged on one side of the back bending part, which is close to the display part, and the third bonding pad is in binding connection with the flexible circuit board;
the first magnetic field constraint structure is provided with an opening, and the third bonding pad is embedded in the opening.
2. The display device of claim 1, wherein a portion of the structure of the at least one turn of coil is integrated in the flexible circuit board and another portion of the structure is integrated in the display panel.
3. The display device according to claim 1 or 2, further comprising a transfer circuit board through which the display panel is bonded to the flexible wiring board.
4. The display device of claim 3, wherein the interposer circuit board comprises a flip-chip thin film interposer.
5. The display device of claim 4, wherein the flip-chip thin film interposer has a first pad and a second pad, the first pad being in bonded connection with the flexible circuit board, the second pad being in bonded connection with the display panel;
the first magnetic field constraint structure is provided with an opening, and the first bonding pad is embedded in the opening.
6. The display device of claim 5, wherein there is no overlap between an orthographic projection of the first pad on a horizontal plane and an orthographic projection of the coil on the horizontal plane.
7. The display device of claim 6, wherein there is no overlap between an orthographic projection of the third pad on a horizontal plane and an orthographic projection of the coil on the horizontal plane.
8. The display device of claim 1, wherein the material of the first magnetic field confinement structure comprises ferrite.
9. The display device according to claim 1, further comprising a heat dissipation layer disposed between the display panel and the flexible wiring board.
10. The display device of claim 1, further comprising a second magnetic field confinement structure disposed between the display panel and the flexible circuit board.
11. The display device of claim 10, further comprising a heat dissipation layer disposed between the second magnetic field confinement structure and the flexible circuit board.
12. A display device according to claim 10 or 11, wherein the material of the second magnetic field confining structure comprises ferrite.
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| CN114865322A (en) * | 2022-05-19 | 2022-08-05 | 北京京东方传感技术有限公司 | Display module and electronic equipment |
| CN118155500A (en) * | 2022-12-07 | 2024-06-07 | 京东方科技集团股份有限公司 | Display module and display device |
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