CN217406786U - Display device and electronic apparatus - Google Patents

Abstract

The utility model provides a display device and electronic equipment belongs to the electronic equipment field. The display device comprises a display panel, a flexible circuit board and a protection structure, wherein the flexible circuit board is connected with the display panel, and the protection structure is positioned on the surface of the flexible circuit board; the protection structure comprises a first insulating layer, a conducting layer and a second insulating layer which are arranged in a stacked mode; the first insulating layer is connected with the flexible circuit board and provided with at least one first opening and at least one second opening which expose the conducting layer; the part of the conductive layer positioned in the first opening is electrically contacted with a ground signal layer of the flexible circuit board; the portion of the conductive layer located in the second opening is in electrical contact with at least one of a test terminal and a test signal line of the flexible circuit board. When the protection structure is arranged on the flexible circuit board, the test signal line is connected with the ground signal layer through the conducting layer, so that the test signal line is grounded, and therefore the adverse effect on electronic equipment after an interference signal of an external environment enters the test signal line is avoided.

Description

Display device and electronic apparatus

Technical Field

The present disclosure relates to the field of electronic devices, and in particular, to a display device and an electronic device.

Background

Flexible circuit boards are common components in display devices, for example for connecting a display panel to a printed circuit board.

The flexible circuit board is generally provided with a plurality of test terminals for testing and test signal lines connected to the test terminals. For example, when the display device is manufactured, after the flexible circuit board is bound with the display panel, the terminal is tested through short circuit to determine whether the connection impedance of the flexible circuit board and the display panel meets the requirement.

The test signal line and the test terminal are generally used only for testing, and after the testing is completed, the test signal line and the test terminal do not function any more. In the use process of the electronic device, some interference signals in the external environment may enter the test signal line, and the interference signals enter other circuit structures in an electromagnetic coupling manner, which may affect the normal operation of the display device.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a display device and an electronic apparatus, which can avoid interference signals in an external environment from influencing the work of the display device. The technical scheme is as follows:

in a first aspect, an embodiment of the present disclosure provides a display device, where the display device includes a display panel, a flexible circuit board, and a protection structure, where the flexible circuit board is connected to the display panel, the flexible circuit board has a ground signal layer, a test terminal, and a test signal line connected to the test terminal, and the protection structure is located on a surface of the flexible circuit board;

the protection structure comprises a first insulating layer, a conducting layer and a second insulating layer which are arranged in a stacked mode;

the first insulating layer is connected with the flexible circuit board and is provided with at least one first opening and at least one second opening which expose the conducting layer;

the part of the conductive layer positioned in the first opening is electrically contacted with the ground signal layer;

a portion of the conductive layer located in the second opening is in electrical contact with at least one of the test terminal and the test signal line.

Optionally, a portion of the conductive layer located in one of the second openings is in electrical contact with at least two of the test terminals; alternatively, the first and second liquid crystal display panels may be,

the first insulating layer has a plurality of the second openings, and a portion of the conductive layer located in one of the second openings is in electrical contact with one of the test terminals.

Optionally, the second opening is located at an edge of the first insulating layer.

Optionally, there are two second openings, and the two second openings are located at two opposite sides of the first insulating layer.

Optionally, the surface of the conductive layer has a protrusion, and the protrusion is located at least one of:

the first opening;

in the second opening.

Optionally, the height of the protrusion is not greater than the thickness of the first insulating layer.

Optionally, the protection structure has a first avoidance through hole, the first avoidance through hole penetrates through the first insulating layer, the conductive layer and the second insulating layer, the flexible circuit board has a second avoidance through hole, and the first avoidance through hole is opposite to the second avoidance through hole.

Optionally, the test signal line is located on a first surface of the flexible circuit board, and the ground signal layer is located at least on the first surface and located on two sides of the test signal line;

the second surface of the flexible circuit board is provided with a plurality of first signal lines, and the first signal lines are crossed with the test signal lines and insulated.

Optionally, the first signal line includes a touch signal line.

In a second aspect, an embodiment of the present disclosure further provides an electronic device, where the electronic device includes any one of the foregoing display devices.

Optionally, the electronic device further includes a sensor located in an avoidance hole that penetrates the flexible circuit board and the protection structure.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

through setting up first opening and second opening on protection architecture's first insulating layer, when setting protection architecture to the flexible circuit board, the part that the conducting layer is located first opening among the protection architecture is electric contact with the ground signal layer of flexible circuit board, the part that the conducting layer is located second opening is electric contact with at least one kind in test terminal and the test signal line of flexible circuit board for the test signal line passes through the conducting layer and links to each other with the ground signal layer, realizes the ground connection to the test signal line, thereby avoid the interference signal of external environment to produce harmful effects to display device after getting into the test signal line.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display device in the related art;

fig. 2 is a schematic structural diagram of a display device according to an embodiment of the disclosure;

FIG. 3 is a bottom view of a protective structure provided by embodiments of the present disclosure;

FIG. 4 is a cross-sectional view I-I of FIG. 3;

fig. 5 is a top view of a flexible circuit board provided by an embodiment of the present disclosure;

FIG. 6 is a sectional view taken along line II-II of FIG. 5;

fig. 7 is a schematic structural diagram of a protection structure provided by an embodiment of the present disclosure connected to a flexible circuit board;

FIG. 8 is a schematic cross-sectional view of another protection structure provided by embodiments of the present disclosure;

fig. 9 is a schematic structural diagram of a protection structure provided by an embodiment of the present disclosure connected to a flexible circuit board;

fig. 10 is a schematic partial structure diagram of a flexible circuit board provided in an embodiment of the present disclosure;

FIG. 11 is a cross-sectional view of a film provided by an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of an electronic device provided in an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

Fig. 1 is a schematic structural diagram of a display device in the related art. As shown in fig. 1, the display device includes a display panel 10, a flexible circuit board 20, and a driving chip 30. The flexible circuit board 20 is bound with the display panel 10, and the driving chip 30 is bound with the display panel 10. Two pairs of test terminals 21 and two pairs of test signal lines 22 connected to the two pairs of test terminals 21, respectively, are provided on the flexible circuit board 20. After the binding is completed, the binding effect needs to be tested. For example, two pairs of test terminals 21 are respectively shorted to perform an impedance test. After the test, some interference signals in the external environment may enter the test signal line 22 during the use of the display device, and then enter other circuit structures adjacent to the test signal line 22 by way of electromagnetic coupling, thereby adversely affecting the normal operation of the display device.

In order to avoid the above problem, an embodiment of the present disclosure provides a display device, and fig. 2 is a schematic structural diagram of an electronic apparatus provided by an embodiment of the present disclosure, as shown in fig. 2, the display device includes a display panel 10, a flexible circuit board 20, and a protection structure 40, the flexible circuit board 20 is connected to the display panel 10, and the protection structure 40 is located on a surface of the flexible circuit board 20.

Fig. 3 is a bottom view of a protective structure provided by embodiments of the present disclosure. Fig. 4 is a sectional view taken along line i-i in fig. 3. As shown in fig. 3 and 4, the protection structure includes a first insulating layer 41, a conductive layer 42, and a second insulating layer 43, which are stacked. The first insulating layer 41 is connected to the flexible circuit board 20. The first insulating layer 41 has at least one first opening 411 and at least one second opening 412 exposing the conductive layer 42.

Fig. 5 is a top view of a flexible circuit board provided by an embodiment of the present disclosure. Fig. 6 is a sectional view ii-ii of fig. 5. As shown in fig. 5 and 6, the flexible circuit board 20 includes at least one metal layer, such as a copper layer. In the embodiment of the present disclosure, the flexible circuit board 20 includes a substrate layer 201 and two metal layers, and the two metal layers are respectively located on two opposite sides of the substrate layer 201. The metal layer is used to form circuit structures such as signal lines and terminals in the flexible circuit board 20. For example, in fig. 6, a metal layer located above the base material layer 201 is used to form the test terminal 21 and the test signal line 22. In designing the flexible circuit board 20, at least a portion of the metal layer is designed to be a ground signal layer 23, and in the embodiment of the present disclosure, two metal layers on two sides of the substrate layer 201 have a portion connected through a via to serve as the ground signal layer 23.

A partial surface area of the metal layer is also covered with an electromagnetic interference shielding layer (EMI layer) 202, and at least a partial area of the test terminal 21 and a partial area of the ground signal layer 23 are exposed with respect to the electromagnetic interference shielding layer 202, i.e., are not covered with the electromagnetic interference shielding layer 202.

The portion of the conductive layer 42 located in the first opening 411 is used to make electrical contact with the ground signal layer 23 of the flexible circuit board. The portion of the conductive layer 42 located in the second opening 412 is used to make electrical contact with at least one of the test terminal 21 and the test signal line 22 of the flexible circuit board.

Fig. 7 is a schematic structural diagram of a protection structure connected to a flexible circuit board according to an embodiment of the disclosure. As shown in fig. 7, the protection structure 40 is disposed on the surface of the flexible circuit board 20, and the first insulating layer 41 is connected to the flexible circuit board 20, for example, by bonding. The conductive layer 42 is in electrical contact with the ground signal layer 23 at the first opening 411 such that the conductive layer 42 is grounded. The conductive layer 42 is in electrical contact with the test terminal 21 at the second opening 412 such that the test terminal 21 is connected to the ground signal layer 23 through the conductive layer 42, and the test signal line 22 is grounded. When the interference signal in the external environment enters the test signal line 22 during the use of the electronic device, the interference signal can be introduced into the ground signal layer 23 through the conductive layer 42, so that the adverse effect on the electronic device caused by the interference signal in the external environment entering the test signal line can be avoided.

As an example, in the disclosed embodiment, conductive layer 42 is in electrical contact with test terminal 21 at second opening 412. In other examples, the conductive layer 42 may also be in electrical contact with the test signal line 22 at the second opening 412. For example, when the protection structure 40 is attached to the flexible circuit board 20, the second opening 412 is attached to be opposite to the test signal line 22, so that the conductive layer 42 is in contact with the test signal line 22. Typically, the surface of the test signal line 22 is covered with an insulating layer, and the insulating layer at the corresponding second opening 412 may be removed to enable the conductive layer 42 to electrically contact the test signal line 22. The test terminals 21 are usually exposed and have no insulating layer on the surface, so that the conductive layer 42 can be grounded after contacting the test terminals 21 when the protection structure 40 is attached.

As shown in fig. 3, the second opening 412 is located at an edge of the first insulating layer 41. The distribution position of the second openings 412 may be set according to the distribution position of the test terminals 21 on the flexible circuit board 20. For example, in the embodiment of the present disclosure, the test terminals 21 on the flexible circuit board 20 are distributed at the edge position of the flexible circuit board 20, and the second opening 412 is arranged at the edge of the first insulating layer 41, so that the second opening 412 is opposite to the test terminals 21.

As shown in fig. 3, in the embodiment of the disclosure, the first insulating layer 41 has two second openings 412, and the two second openings 412 are located at two opposite sides of the first insulating layer 41. The number and distribution of the second openings 412 may be arranged according to the distribution of the test terminals 21 on the flexible circuit board 20. For example, the flexible circuit board 20 illustrated in fig. 2 has two sets of test terminals 21, the two sets of test terminals 21 are distributed at two opposite sides of the flexible circuit board 20, and two second openings 412 are provided at two opposite sides of the first insulating layer 41 to be able to be opposite to the two sets of test terminals 21.

Optionally, the portion of conductive layer 42 located in one second opening 412 is used to electrically contact at least two test terminals 21.

In each second opening 412, for example in fig. 2, the conductive layer 42 is in electrical contact with 4 test terminals 21. The flexible circuit board 20 is usually provided with a plurality of test terminals 21 grouped together, and by providing a second opening 412 corresponding to the plurality of test terminals 21 grouped together, the test terminals 21 are more easily aligned with the second opening 412 when attached, so that each test terminal 21 is electrically contacted with the conductive layer 42.

In other examples, the first insulating layer 41 may have a plurality of second openings 412, and a portion of the conductive layer 42 located in one of the second openings 412 is used to electrically contact one of the test terminals 21. That is, the second openings 412 are provided in one-to-one correspondence with the test terminals 21. For example, 4 test terminals 21 are distributed at one side edge of the flexible circuit board 20, 4 second openings 412 are correspondingly arranged on the first insulating layer 41, and when the protection structure 40 is bonded to the flexible circuit board 20, the 4 test terminals 21 are respectively opposite to the 4 second openings 412.

Fig. 8 is a schematic cross-sectional view of another protection structure provided by embodiments of the present disclosure. This cross-section is located at the same position of the protective structure 20 as the cross-section shown in fig. 4. As shown in fig. 8, the surface of the conductive layer 42 has projections 421.

For example, fig. 9 is a schematic structural diagram of the protection structure provided by the embodiment of the present disclosure and connected to the flexible circuit board, and as shown in fig. 9, in the first opening 411, the surface of the conductive layer 42 has a protrusion 421. When the protection structure 40 is attached to the flexible circuit board 20, the conductive layer 42 is electrically contacted to the test terminals 21 through the protrusions 421 of the surface.

Comparing fig. 7 and 9, the first insulating layer 41 has a certain thickness, and when it is pasted, although the conductive layer 42 can be contacted with the ground signal layer 23 at the first opening 411 by the deformation of the protection structure 40, this will result in a certain stress in the protection structure 40, which will cause the conductive layer 42 to be gradually separated from the ground signal layer 23, and the effect will be more obvious when the area of the first opening 411 is smaller. Under the stress, the contact area between the conductive layer 42 and the ground signal layer 23 is gradually reduced, and even the conductive layer may be completely separated, so that the connection between the protection structure 40 and the ground signal layer 23 fails. In the protection structure 40 shown in fig. 9, the protrusions 421 on the surface of the conductive layer 42 can reduce the above-mentioned influence caused by the thickness of the first insulating layer 41, and ensure that the conductive layer 42 and the ground signal layer 23 are in good electrical contact.

As shown in fig. 9, in the embodiment of the present disclosure, the surface of the conductive layer 42 also has a protrusion 421 in the second opening 412, and the conductive layer 42 is electrically connected to the test terminal 21 through the protrusion 421 located in the second opening 412, so as to avoid adverse effects caused by the thickness of the first insulating layer 41, and ensure that the conductive layer 42 and the test terminal 21 form good electrical contact.

Optionally, the height of the protrusion 421 is not greater than the thickness of the first insulating layer 41.

For example, in the embodiment of the present disclosure, the height of the protrusion 421 is the same as the thickness of the first insulating layer 41, that is, the surface of the protrusion 421 away from the second insulating layer 43 is flush with the surface of the first insulating layer 41 away from the second insulating layer 43. The height of the protrusion 421 is smaller than the thickness of the first insulating layer 41, which causes stress in the protection structure 40, and facilitates the separation of the conductive layer 42 from the ground signal layer 23 and the test terminal 21. The height of the protrusion 421 is greater than the thickness of the first insulating layer 41, so that after the protection structure 40 is adhered to the flexible circuit board 20, the surface of the protection structure 40 is uneven, which is also beneficial to adhesion of the first insulating layer 41 around the protrusion 421 and the flexible circuit board 20, and the first insulating layer 41 is easily separated from the flexible circuit board 20 around the protrusion 421. By setting the height of the protrusion 421 to be equal to the thickness of the first insulating layer 41, the above-described adverse effect caused by the thickness of the first insulating layer 41 can be completely eliminated, and the conductive layer 42 can be brought into good electrical contact with the ground signal layer 23 and the test terminal 21.

Referring to fig. 2, a plurality of electronic devices 24 are generally distributed on the flexible circuit board 20, and the protection structure 40 is adhered to the flexible circuit board 20 to cover the electronic devices 24, so as to perform the functions of protection and electromagnetic shielding.

As an example, the display device is an in-Cell touch (FMLOC) display device. The Flexible Circuit board 20 may be a Main Flexible Circuit board (MFPC) in an in-cell touch display device. The display panel 10 may be an Active-matrix organic light-emitting diode (AMOLED) display panel. A driving circuit (DIC)30 is also bound to the display panel 10.

Fig. 10 is a schematic partial structure diagram of a flexible circuit board according to an embodiment of the present disclosure. As shown in fig. 10, the flexible circuit board has opposite first and second faces. Wherein the test signal line 22 is located on a first side of the flexible circuit board 20. The ground signal layer 23 is located on at least the first surface of the flexible circuit board 20 and on both sides of the test signal line 22. When the flexible circuit board 20 is designed, after various signal lines and electronic devices are arranged on the surface of the flexible circuit board 20, copper is coated on at least one vacant area, that is, copper is used for filling, so as to form the ground signal layer 23. When copper is coated on both sides of the flexible circuit board 20, the copper on the first and second sides of the flexible circuit board 20 is connected through the via hole 231, so that the ground signal layer 23 is located on the first and second sides. The 4 vias 231 are schematically shown in fig. 10.

The second surface of the flexible circuit board 20 has a plurality of first signal lines 25, and the first signal lines 25 cross and are insulated from the test signal lines 22. Since the first signal line 25 and the test signal line 22 are located on both sides of the flexible circuit board 20, they are insulated.

The flexible circuit board 20 generally has a large number of signal lines, and a part of the signal lines are arranged on the first surface of the flexible circuit board, and another part of the signal lines are arranged on the second surface of the flexible circuit board.

The ground signal layer 23 is divided into two parts by the test signal line 22, for example, a filling part located on the left side of the test signal line 22 and a filling part located on the right side of the test signal line 22 in fig. 10. A large gap between the two portions of the ground signal layer 23 can compromise the integrity of the ground signal layer 23 and adversely affect the signal on the first signal line 25. In the embodiment of the present disclosure, since the protection structure 40 is attached after the flexible circuit board 20 is tested, and the test terminal 21 is connected to the ground signal layer 23 through the conductive layer 42 in the protection structure 40, the test signal line 22 can also be regarded as a part of the ground signal layer 23, which is equivalent to increasing the area of the ground signal layer 23, and thus, the adverse effect on the signal on the first signal line 25 can be reduced.

Illustratively, the first signal line 25 includes a touch signal line. The test terminals 21 are connected to the ground signal layer 23 through the conductive layer 42 in the protection structure 40 to improve the signal quality on the touch signal lines and improve the accuracy of touch control of the in-cell touch display device.

In other examples, the flexible circuit board 20 may further have a second signal line thereon. For example, the second signal line includes at least one of a sensing signal line, a power supply line, and a clock signal line. The second signal line may be located on the first side or the second side of the flexible circuit board 20. When the second signal line is located on the second surface, the second signal line may or may not intersect the test signal line 22.

The protective structure may be a film or a portion of a film. Fig. 11 is a cross-sectional view of a film provided by an embodiment of the disclosure. This cross section corresponds to the position iii-iii in fig. 3. As shown in fig. 11, the film includes a carrier film 44 and a protective structure. The carrier film 44 is located on a side of the first insulating layer 41 away from the conductive layer 42, and an edge of the carrier film 44 extends beyond an edge of the first insulating layer 41.

The carrier film 44 is used to protect the protection structure before it is put into use, so as to prevent the first insulating layer 41 from being damaged and prevent the first insulating layer 41 from being contaminated to affect the adhesion between the protection structure and the flexible circuit board.

As shown in fig. 11, the film material further includes a release film 45. The release film 45 is located on the surface of the second insulating layer 43 away from the conductive layer 42, and the edge of the release film 45 exceeds the edge of the second insulating layer 43.

The second insulating layer 43 serves to provide protection to the second insulating layer 43, and can also facilitate separation of the carrier film 44.

The edge of the release film 45 is provided with a tearing handle 451, when the protective structure is used, the tearing handle 451 can be pulled to separate the carrier film 44, and after the protective structure is pasted on the flexible circuit board, the release film 45 is separated through the tearing handle 451.

Illustratively, the carrier Film 44 may be made of a transparent Film material, such as a (Polyester Film, PET) polyethylene terephthalate Film, a (Polyurethane, PU) Polyurethane Film; both the first insulating layer 41 and the second insulating layer 43 may be a polyester-based polymer film such as MYLAR (MYLAR); the conductive layer 42 may be a metal film, such as metallic copper.

Alternatively, as shown in fig. 3, the protection structure 40 has a first bypass via 40a, and the first bypass via 40a penetrates through the first insulating layer 41, the conductive layer 42, and the second insulating layer 43. As shown in fig. 5, the flexible circuit board 20 has a second escape through hole 20 a. After the protection structure 40 is attached to the flexible circuit board 20, the first avoiding through hole 40a is opposite to the second avoiding through hole 20 a.

By providing through holes on the protective structure 40 and the flexible circuit board 20, respectively, and making the two through holes face each other, it is possible to place some devices, such as sensors, etc., in the through holes when manufacturing the electronic apparatus.

For example, in the embodiment of the present disclosure, the protection structure 40 has one first avoiding through hole 40a, and in other examples, two or more first avoiding through holes 40a may be further provided. The shape of the first avoiding through hole 40a can be circular, oval, polygonal or other irregular shapes, and the number of the second avoiding through holes 20a on the flexible circuit board 20 is consistent with the number and the shape of the first avoiding through holes 40 a. By way of example, the first avoiding through hole 40a in the disclosed embodiment is a rounded rectangle.

Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. The electronic device may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer. As shown in fig. 12, the electronic apparatus includes the display device shown in fig. 2.

In the embodiment of the disclosure, after the flexible circuit board is bound, and the test is passed, the protection structure is pasted on the flexible circuit board, by arranging the first opening and the second opening on the first insulating layer of the protection structure, when the protection structure is pasted on the flexible circuit board, the part of the conducting layer in the protection structure, which is located at the first opening, is electrically contacted with the ground signal layer of the flexible circuit board, and the part of the conducting layer, which is located at the second opening, is electrically contacted with at least one of the test terminal of the flexible circuit board and the test signal line, so that the test signal line is connected with the ground signal layer through the conducting layer, and the grounding of the test signal line is realized, thereby avoiding the adverse effect on the electronic equipment after the interference signal of the external environment enters the test signal line.

As shown in fig. 12, the electronic device further includes a sensor 27, the sensor 27 being located in a relief hole 26 extending through the flexible circuit board 20 and the protective structure 40. By providing relief holes 26, the installation of the sensor 27 is facilitated.

Illustratively, the sensor 27 is a fingerprint sensor. For example, electronic devices such as a mobile phone are provided with a fingerprint sensor, so that the mobile phone can be unlocked by a fingerprint.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (10)

1. A display device, comprising a display panel (10), a flexible circuit board (20) and a protection structure (40), wherein the flexible circuit board (20) is connected with the display panel (10), the flexible circuit board (20) is provided with a ground signal layer (23), a test terminal (21) and a test signal line (22) connected with the test terminal (21), and the protection structure (40) is positioned on the surface of the flexible circuit board (20);

the protection structure (40) comprises a first insulating layer (41), a conducting layer (42) and a second insulating layer (43) which are arranged in a stacked mode;

the first insulating layer (41) is connected with the flexible circuit board (20), and the first insulating layer (41) is provided with at least one first opening (411) and at least one second opening (412) exposing the conductive layer (42);

the part of the conductive layer (42) located in the first opening (411) is in electrical contact with the ground signal layer (23);

a portion of the conductive layer (42) located in the second opening (412) is in electrical contact with at least one of the test terminal (21) and the test signal line (22).

2. A display device as claimed in claim 1, characterized in that the part of the electrically conductive layer (42) located in one of the second openings (412) is in electrical contact with at least two of the test terminals (21); alternatively, the first and second electrodes may be,

the first insulating layer (41) has a plurality of the second openings (412), and a portion of the conductive layer (42) located in one of the second openings (412) is in electrical contact with one of the test terminals (21).

3. The display device according to claim 1, wherein the second opening (412) is located at an edge of the first insulating layer (41); or, there are two second openings (412), and the two second openings (412) are located at two opposite sides of the first insulating layer (41).

4. A display device according to claim 3, wherein the surface of the conductive layer (42) has protrusions (421), the protrusions (421) being located at least one of:

in the first opening (411);

in the second opening (412).

5. A display device according to claim 4, wherein the height of the protrusions (421) is not greater than the thickness of the first insulating layer (41).

6. The display device according to any one of claims 1 to 5, wherein the protective structure (40) has a first bypass via (40a), the first bypass via (40a) penetrating through the first insulating layer (41), the conductive layer (42) and the second insulating layer (43), the flexible circuit board (20) has a second bypass via (20a), and the first bypass via (40a) is opposite to the second bypass via (20 a).

7. The display device according to any one of claims 1 to 5, wherein the test signal line (22) is located on a first surface of the flexible circuit board (20), and the ground signal layer (23) is located on at least the first surface and on both sides of the test signal line (22);

the second surface of the flexible circuit board (20) is provided with a plurality of first signal lines (25), and the first signal lines (25) are crossed and insulated with the test signal lines (22).

8. The display device according to claim 7, wherein the first signal line (25) comprises a touch signal line.

9. An electronic device comprising the display device according to any one of claims 1 to 8.

10. The electronic device of claim 9, further comprising a sensor (27), the sensor (27) being located in an avoidance hole (26) extending through the flexible circuit board (20) and the protective structure (40).

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