Display panel and display device

Abstract

This application discloses a display panel and display device, comprising: a substrate, including a first side and a second side opposite to each other, and a side surface located between the first side and the second side; a first trace, located at least on the first side of the substrate; a second trace, located on the side surface of the substrate and electrically connected to the first trace, the first trace including a first portion and a second portion, the first portion being located between the first trace and the second portion; an encapsulation layer, covering the second trace and extending to the first side of the substrate, the encapsulation layer at least covering the first portion of the first trace; and a first functional layer, located on the side of the first trace away from the substrate, wherein in a direction perpendicular to the plane of the substrate, the first functional layer covers the second portion and overlaps with the encapsulation layer to improve the reliability of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] In recent years, with the continuous advancement of display technology and semiconductor manufacturing processes, various display panels have been widely used in electronic products such as smartphones, tablets, laptops, televisions, and wearable devices. Consumers' pursuit of visual experience and device portability continues to drive display products towards higher screen-to-body ratios, larger sizes, and lighter designs. Among these advancements, achieving narrow bezels or even bezel-less designs for display panels has become one of the core indicators of technological competition and product iteration within the industry. However, currently, narrow-bezel display panels have a relatively high probability of failure in reliability tests. Summary of the Invention

[0003] In view of the above problems, this application provides a display panel and display device to improve reliability. The specific solution is as follows:

[0004] A display panel, comprising:

[0005] The substrate includes opposing first and second sides, and a side located between the first and second sides;

[0006] The first trace is located at least on the first side of the substrate;

[0007] The second trace is located on the side of the substrate and is electrically connected to the first trace. The first trace includes a first part and a second part, with the first part located between the first trace and the second part.

[0008] An encapsulation layer covers the second trace and extends to a first side of the substrate, the encapsulation layer at least covering a first portion of the first trace;

[0009] A first functional layer is located on the side of the first trace away from the substrate. In a direction perpendicular to the plane of the substrate, the first functional layer covers the second portion and overlaps with the encapsulation layer.

[0010] Optionally, the encapsulation layer includes a first encapsulation layer and a second encapsulation layer, wherein the first encapsulation layer is located between the second encapsulation layer and the second trace; and in a direction perpendicular to the plane of the substrate, the first functional layer overlaps with the first encapsulation layer at least.

[0011] Optionally, in a direction perpendicular to the plane of the substrate, the first functional layer and the first encapsulation layer overlap, and the second encapsulation layer also overlap.

[0012] Optionally, the first encapsulation layer has a first surface and a second surface opposite to each other, the second surface being the surface of the first encapsulation layer facing the second encapsulation layer, the second surface including a first region and a second region, the first region being located on the side and the second region being located on the first side;

[0013] The second encapsulation layer covers the first region and extends along the direction from the first region to the second region to cover a portion of the second region.

[0014] Optionally, the first encapsulation layer has a first surface and a second surface opposite to each other, the second surface being the surface of the first encapsulation layer facing the second encapsulation layer, the second surface including a first region and a second region, the first region being located on the side and the second region being located on the first side;

[0015] The second encapsulation layer covers the second surface.

[0016] Optionally, in a plane parallel to the substrate, the first encapsulation layer has a first distance D1 between the end of the first encapsulation layer away from the side and the side.

[0017] In a plane parallel to the substrate, the second encapsulation layer has a second distance D2 between the end of the second encapsulation layer away from the side and the side.

[0018] The first distance D1 is greater than or equal to the second distance D2.

[0019] Optionally, it further includes: a plurality of light-emitting units located on the second side of the substrate; in a direction perpendicular to the plane of the substrate, the first encapsulation layer and a portion of the light-emitting units overlap, while the second encapsulation layer and the plurality of light-emitting units do not overlap.

[0020] Optionally, it further includes: a plurality of light-emitting units located on the second side of the substrate; in a direction perpendicular to the plane of the substrate, the first encapsulation layer and a portion of the light-emitting units overlap, and the second encapsulation layer and a portion of the light-emitting units overlap.

[0021] Optionally, the water and oxygen barrier capability of the first encapsulation layer is greater than that of the second encapsulation layer; and / or, the impedance of the second encapsulation layer is less than that of the first encapsulation layer.

[0022] Optionally, the thickness of the second encapsulation layer is greater than or equal to the thickness of the first encapsulation layer.

[0023] Optionally, the impedance of the second encapsulation layer is less than the impedance of the first functional layer, and / or the thickness of the second encapsulation layer is less than the thickness of the first functional layer.

[0024] Optionally, the first functional layer is a thermally conductive layer.

[0025] Optionally, it may also include: a second functional layer located between the first functional layer and the first trace, the second functional layer covering the second portion, and the thickness of the second functional layer being less than the thickness of the first functional layer;

[0026] The second functional layer and the encapsulation layer overlap in a direction perpendicular to the plane of the substrate.

[0027] Optionally, the porosity of the second functional layer is greater than that of the first functional layer.

[0028] Optionally, the encapsulation layer includes a first encapsulation layer and a second encapsulation layer, wherein the first encapsulation layer is located between the second encapsulation layer and the second trace;

[0029] In a direction perpendicular to the plane of the substrate, the second functional layer and the first encapsulation layer overlap;

[0030] Alternatively, in a direction perpendicular to the plane of the substrate, the second functional layer overlaps with both the first encapsulation layer and the second encapsulation layer.

[0031] Optionally, the second functional layer is at least partially in contact with the second portion, and the second functional layer is an insulating layer.

[0032] Optionally, it may also include a filler layer located between the first encapsulation layer and the second encapsulation layer, the filler layer being located on the side surface;

[0033] The water and oxygen barrier capacity of the filling layer is less than that of the first encapsulation layer and greater than that of the second encapsulation layer, or the thickness of the filling layer is greater than that of the encapsulation layer.

[0034] Optionally, it may also include: a third functional layer, the third functional layer being located on the side of the first functional layer away from the substrate;

[0035] In a direction perpendicular to the plane of the substrate, the third functional layer and the encapsulation layer overlap;

[0036] And / or, the third functional layer and the first functional layer do not overlap.

[0037] A display device comprising at least one of the above-described display panels.

[0038] Optionally, the display device is composed of at least two of the above-mentioned display panels spliced ​​together.

[0039] The display panel and display device provided in this application embodiment include: a substrate, a first trace, a second trace, an encapsulation layer, and a first functional layer. The first trace is located on a first side of the substrate, the second trace is located on a side of the substrate, and the first functional layer is located on the side of the first trace away from the substrate. In a direction perpendicular to the plane of the substrate, the first functional layer covers a second portion of the first trace and overlaps with the encapsulation layer, thereby reducing the probability that water vapor or salt water will pass through the gap between the encapsulation layer and the first functional layer and contact the first trace during reliability tests such as salt spray or high temperature and humidity, causing corrosion to the first trace, and improving the reliability of the display panel and display device. Attached Figure Description

[0040] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0041] Figure 1 A cross-sectional view of a display panel;

[0042] Figure 2 for Figure 1 The diagram shows a scenario where the back traces of a display panel are corroded.

[0043] Figure 3 A cross-sectional view of a display panel provided in this application;

[0044] Figure 4 A cross-sectional view of another display panel provided in this application;

[0045] Figure 5 A cross-sectional view of yet another display panel provided in this application;

[0046] Figure 6 A cross-sectional view of another display panel provided in this application;

[0047] Figure 7 A cross-sectional view of yet another display panel provided in this application;

[0048] Figure 8 A cross-sectional view of another display panel provided in this application;

[0049] Figure 9 A cross-sectional view of yet another display panel provided in this application;

[0050] Figure 10 A cross-sectional view of another display panel provided in this application;

[0051] Figure 11A cross-sectional view of yet another display panel provided in this application;

[0052] Figure 12 A partial cross-sectional view of another display panel provided in this application;

[0053] Figure 13 This is a top view of a display panel provided in one embodiment of this application;

[0054] Figure 14 A cross-sectional view of yet another display panel provided in this application;

[0055] Figure 15 A cross-sectional view of another display panel provided in this application;

[0056] Figure 16 A cross-sectional view of yet another display panel provided in this application;

[0057] Figure 17 A cross-sectional view of another display panel provided in this application;

[0058] Figure 18 A schematic diagram showing the relative positions of the first functional layer and the first trace in another display panel provided in this application;

[0059] Figure 19 A cross-sectional view of yet another display panel provided in this application;

[0060] Figure 20 A cross-sectional view of another display panel provided in this application;

[0061] Figure 21 A cross-sectional view of yet another display panel provided in this application;

[0062] Figure 22 A partial cross-sectional view of another display panel provided in this application;

[0063] Figure 23 A top view of the non-display side of another display panel provided in this application;

[0064] Figure 24 A cross-sectional view of another display panel provided in this application;

[0065] Figure 25 A schematic diagram of a display device provided in this application;

[0066] Figure 26 A schematic diagram of another display device provided in this application. Detailed Implementation

[0067] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0068] The terminology used in the embodiments section of this application is only for explaining specific embodiments of this application and is not intended to limit this application. Various modifications and variations can be made to this application without departing from its spirit or scope. Moreover, with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are equally applicable to similar technical problems, which is obvious to those skilled in the art. Therefore, this application is intended to cover modifications and variations of this application that fall within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0069] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0070] As described in the background section, narrow bezel display panels currently have a higher probability of failure in reliability tests.

[0071] like Figure 1 As shown, one way to achieve a narrow bezel in a display panel is to place the circuit board 02 of the display panel 01 on the non-display side, and to achieve electrical connection between the circuits on the display side of the display panel 01 and the non-display side circuit board 02 through side traces 03 and back traces 04. The side traces 03 are covered with an encapsulation layer 05, and the portion of the back trace 04 near the circuit board 02 is covered with a silkscreen layer 06. Thermally conductive adhesive 07 is applied to the side of the silkscreen layer 06 away from the display panel 01.

[0072] The inventors discovered that on the non-display side of the display panel 01, there is a certain gap between the encapsulation layer 05 covering the side traces 03 and the thermally conductive adhesive 07 covering part of the back traces 04. The silkscreen layer 06 is relatively thin and has poor water and oxygen resistance. This causes moisture or salt water to easily penetrate the silkscreen layer 06 and enter the location of the back traces 04 through the gap between the encapsulation layer 05 and the thermally conductive adhesive 07 during reliability tests such as salt spray or high temperature and humidity tests, corroding the back traces 04 and leading to display panel failure. Figure 2 The above, Figure 2 The dashed box shows a schematic diagram of the back traces after they have been eroded.

[0073] In view of this, this application provides a display panel, such as Figure 3 As shown, the display panel includes:

[0074] The substrate 10 includes a first side 10a and a second side 10b opposite to each other, and a side surface 10c located between the first side 10a and the second side 10b; wherein the first side 10a and the second side 10b are two surfaces of the substrate 10 opposite to each other in the thickness direction, and the side surface 10c connects the first side 10a and the second side 10b; optionally, the substrate 10 is a glass substrate, but this application does not limit it and it depends on the specific circumstances;

[0075] The first trace 21 is located at least on the first side 10a of the substrate 10 and serves as a back trace for signal transmission.

[0076] The second trace 22 is located on the side 10c of the substrate 10 and is electrically connected to the first trace 21. As a side trace, it is used to realize the electrical connection between circuits on different sides of the substrate 10. In this embodiment, the first trace 21 includes a first part 21a and a second part 21b. The first part 21a is located between the second trace 22 and the second part 21b. That is, the first part 21a is the part of the first trace 21 that is close to the side 10c, and the second part 21b is located on the side of the first part 21a that is away from the side 10c. It should be noted that in this embodiment, the first trace 21 and the second trace 22 are an integral structure that extends from the first side 10a of the substrate 10 to the side 10c. That is, the first trace 21 and the second trace 22 are different parts of the same trace.

[0077] The encapsulation layer 30 covers the second trace 22 and extends to the first side 10a of the substrate 10 to cover the first portion 21a of the first trace 21, for encapsulating and protecting the second trace 22 and the first portion 21a of the first trace 21 to prevent water and oxygen corrosion and physical damage.

[0078] The first functional layer 40 is located on the side of the first trace 21 away from the substrate 10. In the direction perpendicular to the plane of the substrate 10, the first functional layer 40 covers the second part 21b of the first trace 21 and partially overlaps with the encapsulation layer 30, thereby reducing the probability that water vapor or salt water will pass through the gap between the encapsulation layer 30 and the first functional layer 40 and come into contact with the first trace 21 during reliability tests such as salt spray or high temperature and humidity, causing corrosion to the first trace 21.

[0079] It should be noted that, in this embodiment, the second side 10b of the substrate 10 is the side of the display panel used to set the display unit, corresponding to the display side of the display panel; the first side 10a is opposite to the second side 10b, corresponding to the non-display side of the display panel, and is also the side on which the circuit board is subsequently bonded; the first trace 21 and the second trace 22 are electrically connected to transmit signals provided by external circuits (such as the circuit board bonded to the non-display side of the display panel) to the display unit located on the second side 10b of the substrate 10, thereby controlling the display of the display panel.

[0080] It should also be noted that, in this embodiment, in the direction perpendicular to the plane of the substrate 10, the first functional layer 40 and the encapsulation layer 30 overlap such that, in the direction perpendicular to the plane of the substrate 10, the first functional layer 40 at least partially covers the end of the encapsulation layer 30 located on the first side 10a of the substrate 10, thereby covering the end of the encapsulation layer 30 located on the first side 10a of the substrate 10, thereby reducing the probability that water vapor or salt water will pass through the gap between the encapsulation layer 30 and the first functional layer 40 and come into contact with the first trace 21 during reliability tests such as salt spray or high temperature and high humidity, causing corrosion to the first trace 21.

[0081] Optionally, in one embodiment of this application, the encapsulation layer 30 may be located on each side of the substrate 10 to encapsulate and protect each side of the substrate 10.

[0082] Optionally, in one embodiment of this application, the encapsulation layer 30 includes at least one water- and oxygen-blocking layer to improve the water- and oxygen-blocking capability of the encapsulation layer 30, and the first functional layer 40 includes at least one water- and oxygen-blocking layer to improve the water- and oxygen-blocking capability of the first functional layer 40.

[0083] Optionally, in one embodiment of this application, in the direction perpendicular to the plane of the substrate 10, the overlap of the first functional layer 40 and the encapsulation layer 30 can be such that, in the direction perpendicular to the plane of the substrate 10, the first functional layer 40 only covers the end of the encapsulation layer 30 located on the first side 10a of the substrate 10, or in the direction perpendicular to the plane of the substrate 10, the first functional layer 40 not only covers the end of the encapsulation layer 30 located on the first side 10a of the substrate 10, but also extends to cover a portion of the surface of the encapsulation layer 30 away from the substrate 10. This application does not limit this, and it depends on the specific circumstances.

[0084] In the display panel provided in this application embodiment, the encapsulation layer 30 covers the second trace 22 located on the side 10c of the substrate 10 and extends to cover the first portion 21a of the first trace 21 located on the first side 10a of the substrate 10. In the direction perpendicular to the plane of the substrate 10, the first functional layer 40 covers the second portion 21b of the first trace 21 and overlaps with the encapsulation layer 30, so that the whole composed of the encapsulation layer 30 and the first functional layer 40 can completely cover the first portion 21a, the second portion 21b and the side trace (i.e. the second trace 22), reducing the probability of water vapor or salt water corroding the first trace 21 through the gap between the encapsulation layer 30 and the first functional layer 40 during reliability tests such as salt spray or high temperature and high humidity, leading to display panel failure, and improving the reliability of the display panel.

[0085] Optionally, in one embodiment of this application, such as Figure 4 As shown, the encapsulation layer 30 includes a first encapsulation layer 301 and a second encapsulation layer 302. The first encapsulation layer 301 is located between the second encapsulation layer 302 and the second trace 22. In the direction perpendicular to the plane of the substrate 10, the first functional layer 40 overlaps with the first encapsulation layer 301 at least. Through the overlap of the first functional layer 40 with the first encapsulation layer 301, the encapsulation layer 30 and the first functional layer 40 can completely cover the first part 21a, the second part 21b and the side trace. This reduces the probability that moisture or salt water can easily corrode the first trace 21 through the gap between the encapsulation layer 30 and the first functional layer 40 during reliability tests such as salt spray or high temperature and humidity, leading to display panel failure. This improves the reliability of the display panel.

[0086] Based on the above embodiments, in one embodiment of this application, the following continues... Figure 4 As shown, in the direction perpendicular to the plane of the substrate 10, the first functional layer 40 overlaps only with the first encapsulation layer 301. Through the overlap of the first functional layer 40 and the first encapsulation layer 301, the entire structure of the encapsulation layer 30 and the first functional layer 40 can completely cover the first part 21a, the second part 21b and the side traces. This reduces the probability that moisture or salt water can easily corrode the first trace 21 through the gap between the encapsulation layer 30 and the first functional layer 40 during reliability tests such as salt spray or high temperature and humidity, leading to display panel failure. This improves the reliability of the display panel.

[0087] In another embodiment of this application, such as Figure 5As shown, in a direction perpendicular to the plane of the substrate 10, the first functional layer 40 and the first encapsulation layer 301 overlap, and the second encapsulation layer 302 overlap. By having the first functional layer 40, the first encapsulation layer 301, and the second encapsulation layer 302 all overlap, the entire structure of the encapsulation layer 30 and the first functional layer 40 can completely cover the first part 21a, the second part 21b, and the side traces. This further increases the thickness of the overlapping area of ​​the first functional layer 40 and the encapsulation layer 30, thereby further reducing the probability that moisture or salt water can easily corrode the first trace 21 through the gap between the encapsulation layer 30 and the first functional layer 40 during reliability tests such as salt spray or high temperature and high humidity, leading to display panel failure. This improves the reliability of the display panel.

[0088] Based on any of the above embodiments, in one embodiment of this application, the following continues... Figure 5 As shown, the first encapsulation layer 301 has a first surface and a second surface 31 facing each other, with the second surface 31 being the surface of the first encapsulation layer 301 facing the second encapsulation layer 302. Specifically, the second surface 31 includes a first region 311 and a second region 312, wherein the first region 311 is located on the side 10c of the substrate 10, and the second region 312 is located on the first side 10a of the substrate 10. In this embodiment, the second encapsulation layer 302 covers the first region 311 of the second surface 31 of the first encapsulation layer 301 and extends along the direction from the first region 311 to the second region 312, covering a portion of the second region 312. That is, in a direction perpendicular to the plane of the substrate 10, the second encapsulation layer 302 completely covers the first region 301 in the first region 311 and continues to extend towards the second region 312, covering a portion of the surface of the second region 312, while the other portion of the surface of the second region 312 is not covered by the second encapsulation layer 302.

[0089] In the display panel provided in this application embodiment, the second encapsulation layer 302 covers the entire surface of the first encapsulation layer 301 in the first region 311. In the reliability tests of the display panel, such as salt spray or high temperature and humidity tests, water vapor or salt water needs to penetrate the second encapsulation layer 302 and the first encapsulation layer 301 in sequence before reaching the surface of the covered first region 311. This reduces the probability that the second trace 22 will be corroded by water vapor or salt water in the reliability tests of the display panel, thereby improving the reliability of the display panel.

[0090] Meanwhile, since the second encapsulation layer 302 also extends to cover a portion of the second region 312, the second encapsulation layer 302 and the first encapsulation layer 301 form a stacked structure in the second region 312 in a direction perpendicular to the plane of the substrate 10. This stacked structure increases the total thickness of the encapsulation layer above the first portion 21a of the first trace 21, reducing the probability that the first portion 21a will be corroded by water vapor or salt water in reliability tests such as salt spray or high temperature and humidity, and improving the reliability of the display panel.

[0091] It should be noted that the embodiments of this application do not limit the length of the second encapsulation layer 302 extending to cover the second region 312. Specifically, the longer the length of the second encapsulation layer 302 covering the second region 312, the larger the stacked area of ​​the first encapsulation layer 301 and the second encapsulation layer 302 on the first side of the substrate 10, the stronger the water and oxygen barrier capability of the encapsulation layer 30 on the first side of the substrate 10, and the lower the probability of the first part 21a being corroded in reliability tests such as salt spray or high temperature and high humidity.

[0092] In another embodiment of this application, such as Figure 6 As shown, the first encapsulation layer 301 has a first surface and a second surface 31 facing each other, the second surface 31 being the surface of the first encapsulation layer 301 facing the second encapsulation layer 302. The second surface 31 includes a first region 311 and a second region 312, the first region 311 being located on the side 10c of the substrate 10, and the second region 312 being located on the first side 10a of the substrate 10. Unlike the previous embodiment, in this embodiment, the second encapsulation layer 302 covers the second surface 31.

[0093] In this embodiment, since the second encapsulation layer 302 covers the second surface 31 (i.e., covers the entire first region 311 and the second region 312), the second encapsulation layer 302 and the first encapsulation layer 301 form a stacked structure on the entire second surface 31, thereby increasing the total thickness of the encapsulation layer above the first portion 21a of the first trace 21, further reducing the probability of water vapor or salt water passing through the encapsulation layer 30 to reach the first trace 21 and causing corrosion to the first trace 21, thus improving the reliability of the display panel.

[0094] Optionally, in one embodiment of this application, the end of the first encapsulation layer 301 located on the first side 10a is a slope, continuing as follows... Figure 6 As shown, in this embodiment, the second region 312 refers to the planar portion of the first encapsulation layer 301 located on the side of the first side 10a away from the substrate 10, excluding the end surface of the first encapsulation layer 301 located on the first side 10a.

[0095] like Figure 7As shown, in one embodiment of this application, in a plane parallel to the substrate 10, the first encapsulation layer 301 has a first distance D1 between its end away from the side 10c and the side 10c; in a plane parallel to the substrate 10, the second encapsulation layer 302 has a second distance D2 between its end away from the side 10c and the side 10c. The first distance D1 is greater than the second distance D2, meaning that in this embodiment, the extension length of the first encapsulation layer 301 on the first side 10a is greater than the extension length of the second encapsulation layer 302 in that direction, i.e., the end of the first encapsulation layer 301 is located further away from the side 10c than the second encapsulation layer 302.

[0096] It should be noted that in this embodiment, both the first distance D1 and the second distance D2 are greater than zero, so that the second encapsulation layer 302 not only covers the portion of the first encapsulation layer 301 located on the side of the substrate 10, but also extends to cover the portion of the first encapsulation layer 301 located on the first side of the substrate 10. Thus, in reliability tests such as salt spray or high temperature and humidity tests of the display panel, water vapor or salt water needs to penetrate the second encapsulation layer 302 and the first encapsulation layer 301 in sequence before reaching the surface of the first portion 21a of the first trace 21 and the second trace 22 covered by the encapsulation layer 302. This reduces the probability that the first portion 21a of the first trace 21 and the second trace 22 will be corroded by water vapor or salt water in the reliability tests such as salt spray or high temperature and humidity tests of the display panel, thereby improving the reliability of the display panel.

[0097] Optionally, in one embodiment of the application, such as Figure 8 As shown, the first distance D1 is equal to the second distance D2. That is, in this embodiment, the extension length of the first encapsulation layer 301 on the first side 10a is equal to the extension length of the second encapsulation layer 302 in that direction. In other words, the ends of the first encapsulation layer 301 and the second encapsulation layer 302 are flush, so as to further reduce the probability of the first part 21a of the first trace 21 and the second trace 22 being corroded by water vapor or salt water in the reliability test of the display panel in salt spray or high temperature and high humidity, thereby improving the reliability of the display panel.

[0098] Optionally, based on the above embodiments, in one embodiment of this application, such as Figure 9As shown, the end surface of the first encapsulation layer 301 away from the side 10c is a slope, and the end surface of the second encapsulation layer 302 away from the side 10c is also a slope. In this embodiment, in a plane parallel to the substrate 10, the first distance D1 from the end of the first encapsulation layer 301 away from the side 10c to the side 10c refers to the distance from the end of the surface of the first encapsulation layer 301 that contacts the second encapsulation layer 302 away from the side 10c to the side 10c. The second distance D2 from the end of the second encapsulation layer 302 away from the side 10c to the side 10c refers to the distance from the end of the surface of the second encapsulation layer 302 that contacts the first encapsulation layer 301 to the side 10c. However, this application does not limit this; it depends on the specific circumstances.

[0099] like Figure 10 As shown, in one embodiment of this application, the display panel further includes a plurality of light-emitting units 50 located on the second side 10b of the substrate 10. In this embodiment, in the direction perpendicular to the plane of the substrate 10, the first encapsulation layer 301 overlaps with a portion of the light-emitting units 50, while the second encapsulation layer 302 does not overlap with the plurality of light-emitting units 50. That is, the extension range of the second encapsulation layer 302 on the first side 10a is smaller than the extension range of the first encapsulation layer 301. This allows the second encapsulation layer 302 to not only cover the portion of the first encapsulation layer 301 located on the side 10c of the substrate 10, but also extend to cover the portion of the first encapsulation layer 301 located on the first side 10a of the substrate 10. As a result, in reliability tests such as salt spray or high temperature and humidity tests of the display panel, water vapor or salt water needs to penetrate the second encapsulation layer 302 and the first encapsulation layer 301 in sequence to reach the surface of the first portion 21a and the second trace 22 of the first trace 21 covered by the encapsulation layer 302. This reduces the probability that the first portion 21a and the second trace 22 of the first trace 21 will be corroded by water vapor or salt water in the display panel during reliability tests such as salt spray or high temperature and humidity tests, thereby improving the reliability of the display panel.

[0100] In another embodiment of this application, such as Figure 11 As shown, the display panel also includes a plurality of light-emitting units 50 located on the second side 10b of the substrate 10. In this embodiment, in the direction perpendicular to the plane of the substrate 10, the first encapsulation layer 301 overlaps with some of the light-emitting units 50, and the second encapsulation layer 302 overlaps with some of the light-emitting units 50. Compared with the previous embodiment, in this embodiment, the extension range of the second encapsulation layer 302 on the first side 10a is larger, covering the area where the light-emitting units 50 are located, so as to further increase the area covered by the second encapsulation layer 302 on the first part 21a of the first trace 21, thereby further reducing the probability of the first part 21a of the first trace 21 being corroded by water vapor or salt water in reliability tests such as salt spray or high temperature and high humidity, and improving the reliability of the display panel.

[0101] Optionally, in one embodiment of this application, the light-emitting unit 50 is a Micro-LED or a Mini-LED, but this application does not limit it and it depends on the specific circumstances.

[0102] Optionally, in one embodiment of this application, such as Figure 12 As shown, a control circuit layer 54 is also provided on the second side 10b of the substrate 10. This control circuit layer 54 includes multiple pixel circuits 541, each corresponding to a light-emitting unit 50, and is used to control the light-emitting state of the light-emitting unit 50. Specifically, as... Figure 12 and Figure 13 As shown, the pixel circuit 541 includes a thin-film transistor, which includes a gate G, a source S, a drain D, and a channel layer 5411. The gate G is electrically connected to the scan line 55, and the source S is electrically connected to the data line 56. Under the control of the scan signal transmitted by the scan line 55, the data signal transmitted by the data line 56 is transmitted to the corresponding light-emitting unit 50 to control the light-emitting state of the light-emitting unit, thereby controlling the display of the display panel.

[0103] Optionally, based on the above embodiments, in one embodiment of this application, a light-shielding structure 542 is further provided on the second side 10b of the substrate 10. The light-shielding structure 542 is located between the pixel circuit 541 and the substrate 10, and in a direction perpendicular to the plane of the substrate 10, the light-shielding structure 542 overlaps with the channel layer 5411 to reduce the probability of light shining from the first side 10a of the substrate 10 onto the channel layer 5411, thereby improving the stability of the channel layer 5411 performance.

[0104] Optionally, in a direction perpendicular to the plane of the substrate 10, the light-shielding structure 542 completely covers the channel layer 5411 to further reduce the probability of light illuminating the channel layer 5411 from the first side 10a of the substrate 10, thereby improving the stability of the channel layer 5411's performance. However, this application does not limit this, and it depends on the specific circumstances.

[0105] Optionally, in one embodiment of this application, the pixel circuit further includes a storage capacitor formed by a first electrode 544 and a second electrode 543, for stably maintaining the voltage required by the light-emitting unit 50 during the scanning cycle, thereby ensuring accurate and stable image brightness.

[0106] Optionally, in one embodiment of this application, the first electrode 544 is electrically connected to the second trace 22 to transmit the voltage signal required by the first electrode 544 using the second trace 22.

[0107] Based on the above embodiments, in one embodiment of this application, the first electrode 544 is electrically connected to the second trace 22 via a first connecting line 545; in another embodiment of this application, a third trace 23 is further provided on the second side 10b of the substrate 10, the third trace 23 is electrically connected to the second trace 22, and the first electrode 544 is also electrically connected to the second trace 22 via a second connecting line 546, a third connecting line 547, and a third trace 23; in yet another embodiment of this application, the first electrode 544 is electrically connected to the second trace 22 via a first connecting line 545, and the first electrode 544 is also electrically connected to the second trace 22 via a second connecting line 546, a third connecting line 547, and a third trace 23. This application does not limit this, and the specific arrangement depends on the trace layout in the display panel.

[0108] Optionally, in one embodiment of this application, the second side 10b of the substrate 10 is provided with a zero metal layer, a first metal layer, a second metal layer, a third metal layer, a fourth metal layer, and an intermediate metal layer. The light-shielding structure 542 is located in the zero metal layer, the gate G, the scan line 55, and the first connection line 545 are located in the first metal layer, the source S, the drain D, the data line 56, and the first electrode 544 are located in the second metal layer, the second connection line 546 is located in the third metal layer, the third connection line 547 is located in the fourth metal layer, and the second electrode 543 is located in the intermediate metal layer between the first and second metal layers. However, this application does not limit this and the specific arrangement depends on the circumstances.

[0109] Optionally, in one embodiment of this application, a first insulating layer 5401 is provided between the zero metal layer and the active layer 5411, a second insulating layer 5402 is provided between the active layer 5411 and the first metal layer, a third insulating layer 5403 is provided between the first metal layer and the intermediate metal layer, a fourth insulating layer 5404 is provided between the intermediate metal layer and the second metal layer, and a fifth insulating layer 5405 is provided between the second metal layer and the third metal layer, so as to achieve electrical insulation between different conductive layers by providing insulating layers between adjacent conductive layers.

[0110] Optionally, in one embodiment of this application, the source S is electrically connected to the data line 56 via a first electrical connection line 549, and the drain D is electrically connected to the anode of the light-emitting element 50 via a second electrical connection line 548. The first electrical connection line 549 and the second electrical connection line 548 are located in the fifth metal layer, and a fifth insulating layer 5405 and a sixth insulating layer 5406 are stacked between them and the film layer containing the source S and the drain D (i.e., the second metal layer).

[0111] It should be noted that, in the above embodiments, when electrical connections are required between different metal layers, they can be made through vias, such as the first electrode 544 and the first connecting line 545 being connected through vias, or they can be directly stacked for electrical connection, such as the second connecting line 546 and the third connecting line 547 being directly stacked for electrical connection. This application does not limit this, and it depends on the specific circumstances.

[0112] In addition, the control circuit layer also includes a seventh insulating layer 5407, disposed between the first electrical connection line 548 and the anode of the light-emitting element 50. In this embodiment, the first electrical connection line 548 is electrically connected to the light-emitting element 50 through a via. Optionally, the first electrical connection line 548 can be directly electrically connected to the anode of the light-emitting element 50 through a via, or it can be electrically connected to the third electrical connection line 550 through a via, and then electrically connected to the anode of the light-emitting unit 50 through the third electrical connection line 550. This application does not limit this, and the specific method depends on the circumstances.

[0113] Based on any of the above embodiments, in one embodiment of this application, the plurality of light-emitting units 50 include light-emitting units 50 of different colors, and the light-emitting units 50 of different colors are arranged alternately so that the display panel can achieve color display.

[0114] Based on the above embodiments, in one embodiment of this application, the following continues... Figure 11 As shown, a light-shielding layer 51 is provided on the second side 10b of the substrate 10. The light-shielding layer 51 has multiple openings, and the light-emitting unit 50 is located in the openings, so as to reduce light crosstalk between adjacent light-emitting units 50 by using the light-shielding layer 51.

[0115] Optionally, in one embodiment of this application, a third encapsulation layer 52 is provided on the second side 10b of the substrate 10 for encapsulating the second side 10b of the substrate 10. Optionally, the third encapsulation layer 52 is located on the side of the light-shielding layer 51 away from the substrate 10, and is fixed to the substrate 10 by pressure-sensitive adhesive 53. However, this application does not limit this, and it depends on the specific situation.

[0116] Based on any of the above embodiments, in one embodiment of this application, the water and oxygen barrier capacity of the first encapsulation layer 301 is greater than that of the second encapsulation layer 302. In this embodiment, since the first encapsulation layer 301 is located between the second encapsulation layer 302 and the second trace 22, that is, the first encapsulation layer 301 is closer to the second trace 22 and the first trace 21, and has a stronger water and oxygen barrier capacity, the first encapsulation layer 301 can more effectively prevent water and oxygen from penetrating towards the first trace 21 and the second trace 22, thereby improving the protection effect of the encapsulation layer 30 on the first portion 21a of the second trace 22 and the first trace 21.

[0117] Based on any of the above embodiments, in one embodiment of this application, the impedance of the second encapsulation layer 302 is less than that of the first encapsulation layer 301, so that the second encapsulation layer 302 can release the static electricity generated in the circuit of the second side 10b of the substrate 10, and avoid static electricity accumulation from damaging the display panel. At the same time, the impedance of the first encapsulation layer 301 is higher, which can prevent short circuits between adjacent traces in the traces covered by the first encapsulation layer 301.

[0118] Optionally, in one embodiment of this application, the water and oxygen barrier capability of the first encapsulation layer 301 is greater than that of the second encapsulation layer 302, and the impedance of the second encapsulation layer 302 is less than that of the first encapsulation layer 301. This allows the encapsulation layer 30 to achieve a balance between water and oxygen barrier protection and electrostatic discharge by creating a differential combination of water and oxygen barrier capability and impedance between the first encapsulation layer 301 and the second encapsulation layer 302. This ensures both corrosion protection for the first trace 21 and the second trace 22 and electrostatic discharge functionality. However, this application does not limit this specific embodiment; the choice depends on the specific circumstances.

[0119] Optionally, in one embodiment of this application, the impedance value of the first encapsulation layer 301 is at least 10 times the impedance value of the second encapsulation layer 302. 4 The impedance of the first encapsulation layer 301 is ≥E12, and the impedance of the second encapsulation layer 302 is ≤E8, so that the first encapsulation layer 301 has a higher water and oxygen barrier capability and the second encapsulation layer 302 has a lower impedance. However, this application does not limit this and it depends on the specific situation.

[0120] Based on any of the above embodiments, in one embodiment of this application, the encapsulation layer 30 also has a light-shielding function. For example, when the encapsulation layer 30 includes a first encapsulation layer 301 and a second encapsulation layer 302, at least one of the first encapsulation layer 301 and the second encapsulation layer 302 can be a black film layer so that the encapsulation layer 30 has a light-shielding function to prevent the light inside the display panel from being reflected when it shines on the side 10c of the substrate 10 and affecting the display of the display panel.

[0121] Specifically, in one embodiment of this application, the first encapsulation layer 301 and the second encapsulation layer 302 are ink layers. For example, the first encapsulation layer 301 is a high-resistivity ink layer and the second encapsulation layer 302 is a low-resistivity ink layer, so that the water and oxygen blocking ability of the first encapsulation layer 301 is greater than that of the second encapsulation layer 302, and the impedance of the second encapsulation layer 302 is less than that of the first encapsulation layer 301. The encapsulation layer 30 also has a light-shielding function. However, this application does not limit this and it depends on the specific situation.

[0122] Optionally, in one implementation of this embodiment, the high-resistivity ink layer and the low-resistivity ink layer are filled with conductive material. By controlling the filling of the conductive material, the impedance of the second encapsulation layer 302 is made less than the impedance of the first encapsulation layer 301. However, this application does not limit this and it depends on the specific circumstances. Specifically, in one embodiment of this application, the high-resistivity ink and the low-resistivity ink layer can be made using at least one of acrylic system, epoxy system, or rubber system as the matrix material, and the optical density (OD value) of the ink can be adjusted by adding carbon black or black pigment components. In terms of impedance control, on the one hand, the conductivity of carbon black can be adjusted by using carbon black dispersant, and on the other hand, the ink resistance value can be precisely adjusted by doping metal particles such as tungsten into the ink. However, this application does not limit this and it depends on the specific circumstances.

[0123] Optionally, based on the above embodiments, in one embodiment of this application, the encapsulation layer 30 is formed by pad printing to facilitate the production of the encapsulation layer 30. However, this application does not limit this to the specific method, but rather it depends on the circumstances.

[0124] Based on any of the above embodiments, in one embodiment of this application, such as Figure 14 As shown, the thickness h2 of the second encapsulation layer 302 is greater than or equal to the thickness h1 of the first encapsulation layer 301. By increasing the thickness of the second encapsulation layer 302, the impedance of the second encapsulation layer 302 is further reduced, which facilitates better electrostatic discharge and avoids damage to the display panel caused by electrostatic accumulation. Moreover, the thicker second encapsulation layer 302 can better fill the gaps on the surface of the first encapsulation layer 301, improving the surface flatness of the encapsulation layer 30.

[0125] In another embodiment of this application, the thickness of the first encapsulation layer 301 is greater than the thickness of the second encapsulation layer 302. By increasing the thickness of the first encapsulation layer 301, the water and oxygen barrier capability of the first encapsulation layer 301 is further improved, thereby improving the water and oxygen barrier capability of the encapsulation layer 30. This further reduces the probability that water vapor or salt water will penetrate the encapsulation layer 30 and reach the first portion 21a and the second trace 22 of the first trace 21, causing corrosion to the first portion 21a and the second trace 22 of the first trace 21, thus improving the reliability of the display panel.

[0126] It should be noted that, in this embodiment, the thickness of the first encapsulation layer 301 at each location is the dimension perpendicular to its extension direction, and the thickness of the second encapsulation layer 302 at each location is the dimension perpendicular to its extension direction.

[0127] Optionally, in one embodiment of this application, the thickness of the first encapsulation layer 301 is the same at all locations to reduce the manufacturing difficulty of the first encapsulation layer 301, and the thickness of the second encapsulation layer 302 is the same at all locations to reduce the manufacturing difficulty of the second encapsulation layer 302. However, this application is not limited to this. In other embodiments of this application, the thickness of the first encapsulation layer 301 located on the side 10c may be different from the thickness of the first encapsulation layer 301 located on the first side 10a. For example, the thickness of the first encapsulation layer 301 located on the side 10c may be less than the thickness of the first encapsulation layer 301 located on the first side 10a. The thickness of one side 10a, or the thickness of the first encapsulation layer 301 located on the side 10c, is greater than the thickness of the first encapsulation layer 301 located on the first side 10a; the thickness of the second encapsulation layer 302 located on the side 10c and the thickness of the second encapsulation layer 302 located on the first side 10a may also be different. For example, the thickness of the second encapsulation layer 302 located on the side 10c is less than the thickness of the second encapsulation layer 302 located on the first side 10a, or the thickness of the second encapsulation layer 302 located on the side 10c is greater than the thickness of the second encapsulation layer 302 located on the first side 10a.

[0128] Based on any of the above embodiments, in one embodiment of this application, the following continues... Figure 14 As shown, in the plane parallel to the substrate 10, the width W1 of the overlapping area of ​​the first functional layer 40 and the encapsulation layer 30 in the direction perpendicular to the side surface 10c of the substrate 10 ranges from 50μm to 10000μm, and can be selected from 1mm to 5mm. This ensures that the first functional layer 40 and the encapsulation layer 30 overlap sufficiently to eliminate the gap between them and improve the reliability of the display panel, while avoiding the increased cost and process difficulty caused by the excessive extension of the first functional layer 40.

[0129] Specifically, in one embodiment of this application, in the plane parallel to the substrate 10, the width of the overlapping area of ​​the first functional layer 40 and the first encapsulation layer 301 in the direction perpendicular to the side surface 10c of the substrate 10 ranges from 50μm to 10000μm, and can be selected as 1mm to 5mm. This ensures that the first functional layer 40 and the first encapsulation layer 301 overlap sufficiently to eliminate the gap between them and improve the reliability of the display panel, while avoiding the increased cost and process difficulty caused by the excessive extension of the first functional layer 40.

[0130] Based on any of the above embodiments, in one embodiment of this application, the impedance of the second encapsulation layer 302 is less than the impedance of the first functional layer 40, so as to release the static electricity generated in the circuit of the second side 10b of the substrate 10 by utilizing the second encapsulation layer 302 with lower impedance, and to provide stronger water and oxygen blocking ability by utilizing the first functional layer 40 with higher impedance, thereby reducing the probability that the part of the first trace 21 covered by the first functional layer 40 will be corroded by water vapor or salt water, and improving the reliability of the display panel.

[0131] Based on any of the above embodiments, in one embodiment of this application, the thickness of the second encapsulation layer 302 is less than the thickness of the first functional layer 40. This reduces the step difference between different parts of the first functional layer 40 at the overlapping boundary between the second encapsulation layer 302 and the first functional layer 40, improving the flatness of the surface of the first functional layer 40 away from the substrate 10. However, this application does not limit this, and it depends on the specific circumstances. At the same time, the thinner second encapsulation layer 302 will not significantly increase the overall thickness of the encapsulation layer 30, which is beneficial for achieving a narrow bezel design.

[0132] Based on any of the above embodiments, in one embodiment of this application, the width of the portion of the encapsulation layer 30 located on the first side 10a of the substrate 10 in the plane parallel to the substrate 10 is in the range of 0.2 mm to 0.3 mm in the direction perpendicular to the side 10c of the substrate 10, so as to reduce the process difficulty of the encapsulation layer 30. However, this application does not limit this, and it depends on the specific situation.

[0133] Optionally, in one embodiment of this application, the following continues... Figure 10 As shown, when the encapsulation layer 30 includes a first encapsulation layer 301 and a second encapsulation layer 302, in the plane parallel to the substrate 10, the width W3 of the portion of the first encapsulation layer 301 located on the first side 10a of the substrate 10 in the direction perpendicular to the side surface 10c of the substrate 10 ranges from 0.2 mm to 0.3 mm, so as to reduce the manufacturing difficulty of the first encapsulation layer 301; in the plane parallel to the substrate 10, the width W4 of the portion of the second encapsulation layer 302 located on the first side 10a of the substrate 10 in the direction perpendicular to the side surface 10c of the substrate 10 ranges from 0.2 mm to 0.3 mm, so as to reduce the manufacturing difficulty of the second encapsulation layer 302.

[0134] Based on any of the above embodiments, in one embodiment of this application, the first functional layer 40 is a thermally conductive layer, so that by utilizing the overlap of the thermally conductive layer and the encapsulation layer 30 in the display panel in a direction perpendicular to the substrate 10, the probability of the first trace 21 being corroded by water vapor or salt water is reduced, the reliability of the display panel is improved, the structure of the display panel is simplified, and the thickness of the display panel is reduced.

[0135] It should be noted that in the actual manufacturing process of the display panel, after the encapsulation layer 30 is manufactured and before the thermal conductive layer (i.e., the first functional layer 40) is manufactured, other processes are involved. Therefore, based on the above embodiments, in one embodiment of this application, such as Figure 15As shown, the display panel also includes a second functional layer 60, which is located between the first functional layer 40 and the first trace 21. The second functional layer 60 covers the second portion 21b of the first trace 21 to protect the second portion 21b before the first functional layer 40 is manufactured, so as to prevent the second portion 21b from being scratched.

[0136] Optionally, in one embodiment of this application, the thickness of the second functional layer 60 is less than the thickness of the first functional layer 40, so that after the first functional layer 40 is fabricated, the larger thickness of the first functional layer 40 can be used to reduce the step difference between different parts of the first functional layer 40 away from the substrate 10 and improve the flatness of the surface of the first functional layer 40 away from the substrate 10. However, this application does not limit this, and it depends on the specific circumstances.

[0137] Optionally, in one embodiment of this application, the following continues... Figure 15 As shown, the second functional layer 60 and the encapsulation layer 30 overlap in a direction perpendicular to the plane of the substrate 10, so that the encapsulation layer 30 and the second functional layer 60 form a stacked structure in the overlapping area, which further increases the difficulty for water vapor or salt water to penetrate the encapsulation layer 30 to reach the first trace 21, reduces the probability of water vapor or salt water causing corrosion to the first trace 21, and improves the reliability of the display panel.

[0138] Specifically, in one embodiment of this application, the second functional layer 60 is a screen printing layer, but this application does not limit this and it depends on the specific circumstances.

[0139] Optionally, in one embodiment of this application, the porosity of the second functional layer 60 is greater than that of the first functional layer 40. It should be noted that lower porosity results in better density and stronger water and oxygen barrier properties. Therefore, in this embodiment, compared to the overlap of the second functional layer 60 and the encapsulation layer 30, the overlap of the first functional layer 40 and the encapsulation layer 30 achieves better water and oxygen barrier effects, further reducing the probability of the first trace 21 being corroded by moisture or salt water, and improving the reliability of the display panel.

[0140] Based on any of the above embodiments, in one embodiment of this application, such as Figure 16 As shown, the encapsulation layer 30 includes a first encapsulation layer 301 and a second encapsulation layer 302, wherein the first encapsulation layer 301 is located between the second encapsulation layer 302 and the second trace 22; in a direction perpendicular to the plane of the substrate 10, the second functional layer 60 and the first encapsulation layer 301 overlap, so that by setting the second functional layer 60 and the first encapsulation layer 301 to overlap, the probability of the first portion 21a of the first trace 21 being corroded by moisture or salt water is further reduced, thereby improving the reliability of the display panel.

[0141] Optionally, in one embodiment of this application, such as Figure 17 As shown, in the direction perpendicular to the plane of the substrate 10, the second functional layer 60 and the first encapsulation layer 301 and the second encapsulation layer 302 overlap, so that the second functional layer 60 and the encapsulation layer 30 form a stacked structure over a larger area, further reducing the probability that the first part 21a of the first trace 21 will be corroded by water vapor or salt water, and improving the reliability of the display panel.

[0142] It should be noted that, in this embodiment, in the direction perpendicular to the plane of the substrate 10, the overlap of the second functional layer 60 and the first encapsulation layer 301 includes, in the direction perpendicular to the plane of the substrate 10, the second functional layer 60 at least covers the end of the first encapsulation layer 301 away from the side 10c, thereby achieving wrapping of the end of the first encapsulation layer 301 away from the side 10c. Specifically, in this embodiment, in the direction perpendicular to the plane of the substrate 10, the second functional layer 60 may only cover the end of the first encapsulation layer 301 away from the side 10c, or it may not only cover the end of the first encapsulation layer 301 away from the side 10c, but also extend to cover a portion of the surface area of ​​the first encapsulation layer 301 away from the substrate 10. This application does not limit this, and it depends on the specific situation.

[0143] Optionally, in one embodiment of this application, when the second functional layer 60 and the encapsulation layer 30 overlap, in the direction perpendicular to the substrate 10, the first functional layer 40 may cover a portion of the second functional layer 60, continuing as follows. Figure 16 As shown, it can also completely cover the second functional layer 60, and continue as follows. Figure 17 As shown, this application does not limit this, as long as the first functional layer 40 and the encapsulation layer 30 overlap in the direction perpendicular to the substrate 10, and the second functional layer 60 and the encapsulation layer 30 overlap.

[0144] Based on any of the above embodiments, in one embodiment of this application, such as Figure 17 and Figure 18 As shown, Figure 18 The second functional layer 60 is located in the area of ​​the second functional layer 60. The second functional layer 60 and the first trace 21 are in top view. The second functional layer 60 is at least partially in contact with the second part 21b. The second functional layer 60 is an insulating layer so that adjacent first traces 21 covered by the second functional layer 60 are electrically insulated from each other, so as to avoid short circuits between adjacent first traces 21.

[0145] Based on any of the above embodiments, in one embodiment of this application, such as Figure 19As shown, the display panel also includes a filler layer 70 located between the first encapsulation layer 301 and the second encapsulation layer 302. The filler layer 70 is located on the side 10c of the substrate 10 to fill the gap between the first encapsulation layer 301 and the second encapsulation layer 302 in the side 10c region and improve the flatness of the encapsulation layer 30 in the side 10c region.

[0146] Optionally, in one embodiment of this application, the water and oxygen barrier capacity of the filling layer 70 is less than that of the first encapsulation layer 301 and greater than that of the second encapsulation layer 302. That is, the water and oxygen barrier capacity of the filling layer 70 is between that of the first encapsulation layer 301 and the second encapsulation layer 302, so that the encapsulation layer 30 and the filling layer 70 as a whole form a gradient distribution in terms of water and oxygen barrier capacity, which not only ensures the water and oxygen barrier capacity near the wiring area (first encapsulation layer 301), but also realizes the electrostatic discharge function (second encapsulation layer 302).

[0147] Optionally, in one embodiment of this application, the filling layer 70 is an organic layer. Specifically, in this embodiment, the filling layer 70 can be a transparent film layer or a light-shielding film layer to enhance the light-shielding function of the side 10c of the substrate 10. However, this application does not limit this and it depends on the specific situation.

[0148] Specifically, in one embodiment of this application, the material of the filler layer 70 is selected from at least one of acrylic system materials, epoxy system materials, or acrylic system materials doped with rubber components. When the filler layer 70 is a light-shielding film layer, the material of the filler layer 70 includes carbon black or black pigment, so that its optical density (OD) value can be adjusted by the amount of carbon black or black pigment added, thereby obtaining different light-shielding degrees. However, this application does not limit this and it depends on the specific circumstances.

[0149] Based on any of the above embodiments, in one embodiment of this application, the following continues... Figure 19 As shown, the thickness of the filler layer 70 is greater than the thickness of the encapsulation layer 30, so as to provide a flatter substrate for the subsequent second encapsulation layer 302 by utilizing the thicker filler layer 70, thereby improving the fabrication quality of the encapsulation layer 30. However, this application is not limited to this; in other embodiments of this application, the thickness of the filler layer 70 may also be less than the thickness of the encapsulation layer 30, continuing as follows. Figure 17 As shown, the specifics depend on the circumstances.

[0150] Optionally, in one embodiment of this application, the thickness of the first encapsulation layer 301 ranges from 1 micrometer to 10 micrometers, and can further be 1 micrometer to 3 micrometers; the thickness of the second encapsulation layer 302 ranges from 1 micrometer to 10 micrometers, and can further be 1 micrometer to 3 micrometers; and the thickness of the filler layer 70 ranges from 10 micrometers to 150 micrometers. However, this application does not limit the thickness of the filler layer, and the thickness can be determined according to the specific circumstances.

[0151] Optionally, in this embodiment, the filler layer 70 is located only on the side 10c of the substrate 10 and does not extend to the first side 10a of the substrate 10, so as to reduce the process difficulty of the filler layer 70 and avoid the poor flatness of the surface of the first functional layer away from the substrate 10 after its formation due to the large thickness of the filler layer 70.

[0152] Based on any of the above embodiments, in one embodiment of this application, such as Figure 20 As shown, the display panel also includes a third functional layer 80, which is located on the side of the first functional layer 40 away from the substrate 10. Optionally, the third functional layer 80 is a heat dissipation plate to evenly diffuse the heat generated when the display panel is working, reduce the local temperature rise of the display panel during operation, and improve the heat dissipation efficiency of the display panel.

[0153] Optionally, in one embodiment of this application, the third functional layer 80 and the encapsulation layer 30 overlap in a direction perpendicular to the plane of the substrate 10, so as to further reduce the probability of the first trace 21 being corroded by moisture or salt water and improve the reliability of the display panel.

[0154] Specifically, in one embodiment of this application, the encapsulation layer 30 includes a first encapsulation layer 301 and a second encapsulation layer 302. The first encapsulation layer 301 is located between the second encapsulation layer 302 and the first trace 21. In this embodiment, the overlap between the third functional layer 80 and the encapsulation layer 30 in the direction perpendicular to the plane of the substrate 10 may include: the third functional layer 80 only overlaps with the first encapsulation layer 301 in the direction perpendicular to the plane of the substrate 10, or it may include: the third functional layer 80 overlaps with both the first encapsulation layer 301 and the second encapsulation layer 302 in the direction perpendicular to the plane of the substrate 10. This application does not limit this, and it depends on the specific situation.

[0155] Optionally, in one embodiment of this application, the following continues... Figure 20 As shown, in the plane parallel to the substrate 10, the width W2 of the overlapping area between the third functional layer 80 and the encapsulation layer 30 in the direction perpendicular to the side surface 10c of the substrate 10 ranges from 50μm to 10000μm, and can be selected as 1mm to 5mm. This ensures sufficient overlap between the third functional layer 80 and the encapsulation layer 30 to reduce the probability of corrosion of the first trace 21 and improve the reliability of the display panel, while avoiding increased cost and process difficulty due to excessive extension of the third functional layer 80. However, this application does not limit this, and it depends on the specific circumstances.

[0156] Optionally, in one embodiment of this application, the third functional layer 80 and the first functional layer 40 do not overlap in the direction perpendicular to the plane of the substrate 10. For example, in the plane parallel to the substrate 10, the area of ​​the first functional layer 40 is smaller than the area of ​​the third functional layer 80, and the distance between the boundary of the first functional layer 40 and the boundary of the third functional layer 80 is greater than zero. That is, the first functional layer 40 is recessed relative to the third functional layer 80 to prevent the first functional layer 40 from overflowing beyond the side 10c of the substrate 10 during the manufacturing process of the display panel when the first functional layer 40 is a thermally conductive adhesive.

[0157] It should be noted that in the embodiments of this application, when the third functional layer 80 is a heat spreader, the heat spreader can cover the entire back area of ​​the display panel, or it can only cover the area where the first functional layer 40 is located. This application does not limit this.

[0158] Optionally, in one embodiment of this application, the third functional layer 80 is a conductive functional layer, such as a metal plate. In this embodiment, the third functional layer 80 is electrically connected to the second encapsulation layer 302 to establish an electrostatic discharge path with the second encapsulation layer 302, facilitating the release of static electricity generated in the circuit of the second side 10b of the substrate 10 and preventing static electricity accumulation from damaging the display panel. Specifically, in one embodiment of this application, the second encapsulation layer 302 is electrically connected to the third functional layer 80 through copper foil, but this application is not limited to this and depends on the specific circumstances.

[0159] Optionally, in one embodiment of this application, the first functional layer is a thermally conductive adhesive to bond the third functional layer 80 and the substrate 10 while achieving thermal conductivity. Its thickness ranges from 45 micrometers to 55 micrometers, including the endpoint values, to balance the thermal conductivity and adhesion of the first functional layer 40. The thickness of the third functional layer 80 ranges from 0.5mm to 0.6mm to avoid its thickness being too small, which would affect its mechanical strength, and at the same time, to avoid its thickness being too large, which would affect the weight and cost of the display panel and the assembly difficulty of the third functional layer. However, this application does not limit this and it depends on the specific circumstances.

[0160] Based on any of the above embodiments, in one embodiment of this application, such as Figure 21 and Figure 22As shown, the first functional layer 40 has an opening 90 extending through the first functional layer 40 in a direction perpendicular to the plane of the substrate 10. The first trace 21 also includes a third portion 21c located on the side of the second portion 21b away from the first portion 21a. The opening 90 exposes the third portion 21c to facilitate the subsequent bonding of a circuit board for controlling the display panel at that location. It should be noted that when the display panel also includes a third functional layer 80, the opening 90 also extends through the third functional layer 80 in a direction perpendicular to the plane of the substrate 10, so that the opening 90 exposes the third portion 21c to facilitate the subsequent bonding of a circuit board for controlling the display panel at that location.

[0161] Optionally, in one embodiment of this application, the size of the opening 90 in the plane parallel to the substrate 10 and along the direction perpendicular to the side surface 10c of the substrate 10 ranges from 0.2 mm to 4 mm. This is to ensure the bonding area of ​​the circuit board within the process tolerance range, while avoiding an excessively large opening 90 that would result in a large exposed area of ​​the first trace 21, making it easily scratched. However, this application does not limit this to a specific size, and the size can be determined according to the specific circumstances.

[0162] Optionally, in this embodiment, the number of openings 90 can be one, such as... Figure 21 and Figure 22 As shown, there can also be two, such as Figure 23 As shown, Figure 23 It is a top view of the non-display side of the display panel, that is, a top view from the first side 10a to the second side 10b of the substrate 10. It can also be other numbers, which are not limited in this application and depend on the specific circumstances.

[0163] Optionally, in one embodiment of this application, such as Figure 24 As shown, the display panel also includes a circuit board 91. The circuit board 91 is electrically connected to the first trace 21 at the openings of the first functional layer 40 and the third functional layer 80 via conductive adhesive 92. Specifically, the circuit board 91 can be a flexible printed circuit board, but this application does not limit this; it depends on the specific circumstances. It should be noted that in this embodiment, the gap between the circuit board 91 and the third functional layer 80 can be filled with insulating encapsulation material, but this application does not limit this; it depends on the specific circumstances.

[0164] Correspondingly, such as Figure 25 As shown, this application also provides a display device, which may include at least one display panel 100 provided in any of the above embodiments. Since the relevant content of the display panel has been described in detail in the above embodiments, this application will not repeat it here.

[0165] It should be noted that, in this embodiment, the display device can be any product with display function, such as a mobile phone, tablet computer, laptop computer, in-vehicle display, wearable device, etc. This application does not limit this, and it depends on the specific circumstances.

[0166] Optionally, in one embodiment of this application, such as Figure 26 As shown, the display device is composed of at least two display panels 100 spliced ​​together to achieve large-size display and meet the needs of application scenarios such as public information display screens (PID) and splicing screens.

[0167] Optionally, in one embodiment of this application, the splicing gap between adjacent display panels 100 can be filled with sealant to further improve the overall water and oxygen resistance of the display device.

[0168] Optionally, in one embodiment of this application, the display device may include at least two display panels 100 that can be arranged in rows and columns to form a display device of any size. This application does not limit this, and it depends on the specific circumstances.

[0169] In summary, the display panel and display device provided in this application include: a substrate, a first trace, a second trace, an encapsulation layer, and a first functional layer. The first trace is located on a first side of the substrate, the second trace is located on a side of the substrate, and the first functional layer is located on the side of the first trace away from the substrate. In a direction perpendicular to the plane of the substrate, the first functional layer covers a second portion of the first trace and partially overlaps with the encapsulation layer. This reduces the probability that moisture or salt water will penetrate the gap between the encapsulation layer and the first functional layer and contact the first trace during reliability tests such as salt spray or high temperature and humidity, causing corrosion to the first trace. This improves the reliability of the display panel and the display device.

[0170] The various embodiments in this specification are described in a progressive, parallel, or combined manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0171] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

Claims

1. A display panel, characterized in that, include: The substrate includes opposing first and second sides, and a side located between the first and second sides; The first trace is located at least on the first side of the substrate; The second trace is located on the side of the substrate and is electrically connected to the first trace. The first trace includes a first part and a second part, with the first part located between the first trace and the second part. An encapsulation layer covers the second trace and extends to a first side of the substrate, the encapsulation layer at least covering a first portion of the first trace; A first functional layer is located on the side of the first trace away from the substrate. In a direction perpendicular to the plane of the substrate, the first functional layer covers the second portion and overlaps with the encapsulation layer.

2. The display panel according to claim 1, characterized in that, The encapsulation layer includes a first encapsulation layer and a second encapsulation layer, wherein the first encapsulation layer is located between the second encapsulation layer and the second trace; in a direction perpendicular to the plane of the substrate, the first functional layer overlaps with the first encapsulation layer at least.

3. The display panel according to claim 2, characterized in that, In a direction perpendicular to the plane of the substrate, the first functional layer and the first encapsulation layer overlap, and the second encapsulation layer also overlap.

4. The display panel according to claim 2 or 3, characterized in that, The first encapsulation layer has a first surface and a second surface opposite to each other. The second surface is the surface of the first encapsulation layer facing the second encapsulation layer. The second surface includes a first region and a second region. The first region is located on the side and the second region is located on the first side. The second encapsulation layer covers the first region and extends along the direction from the first region to the second region to cover a portion of the second region.

5. The display panel according to claim 2 or 3, characterized in that, The first encapsulation layer has a first surface and a second surface opposite to each other. The second surface is the surface of the first encapsulation layer facing the second encapsulation layer. The second surface includes a first region and a second region. The first region is located on the side and the second region is located on the first side. The second encapsulation layer covers the second surface.

6. The display panel according to claim 2 or 3, characterized in that, In a plane parallel to the substrate, the first encapsulation layer has a first distance D1 between the end of the first encapsulation layer away from the side and the side. In a plane parallel to the substrate, the second encapsulation layer has a second distance D2 between the end of the second encapsulation layer away from the side and the side. The first distance D1 is greater than or equal to the second distance D2.

7. The display panel according to claim 2 or 3, characterized in that, Also includes: Multiple light-emitting units located on the second side of the substrate; In a direction perpendicular to the plane of the substrate, the first encapsulation layer and a portion of the light-emitting units overlap, while the second encapsulation layer and the plurality of light-emitting units do not overlap.

8. The display panel according to claim 2 or 3, characterized in that, Also includes: Multiple light-emitting units located on the second side of the substrate; In a direction perpendicular to the plane of the substrate, the first encapsulation layer overlaps with a portion of the light-emitting unit, and the second encapsulation layer overlaps with a portion of the light-emitting unit.

9. The display panel according to claim 2 or 3, characterized in that, The first encapsulation layer has a greater water and oxygen barrier capacity than the second encapsulation layer; and / or, the impedance of the second encapsulation layer is less than the impedance of the first encapsulation layer.

10. The display panel according to claim 2 or 3, characterized in that, The thickness of the second encapsulation layer is greater than or equal to the thickness of the first encapsulation layer.

11. The display panel according to claim 2 or 3, characterized in that, The impedance of the second encapsulation layer is less than the impedance of the first functional layer, and / or the thickness of the second encapsulation layer is less than the thickness of the first functional layer.

12. The display panel according to claim 1, characterized in that, The first functional layer is a thermally conductive layer.

13. The display panel according to claim 1 or 12, characterized in that, Also includes: A second functional layer is located between the first functional layer and the first trace, the second functional layer covers the second portion, and the thickness of the second functional layer is less than the thickness of the first functional layer; The second functional layer and the encapsulation layer overlap in a direction perpendicular to the plane of the substrate.

14. The display panel according to claim 13, characterized in that, The porosity of the second functional layer is greater than that of the first functional layer.

15. The display panel according to claim 13, characterized in that, The encapsulation layer includes a first encapsulation layer and a second encapsulation layer, wherein the first encapsulation layer is located between the second encapsulation layer and the second trace; In a direction perpendicular to the plane of the substrate, the second functional layer and the first encapsulation layer overlap; Alternatively, in a direction perpendicular to the plane of the substrate, the second functional layer overlaps with both the first encapsulation layer and the second encapsulation layer.

16. The display panel according to claim 13, characterized in that, The second functional layer is at least partially in contact with the second portion, and the second functional layer is an insulating layer.

17. The display panel according to claim 2, characterized in that, It also includes a filler layer located between the first encapsulation layer and the second encapsulation layer, the filler layer being located on the side surface; The water and oxygen barrier capacity of the filling layer is less than that of the first encapsulation layer and greater than that of the second encapsulation layer, or the thickness of the filling layer is greater than that of the encapsulation layer.

18. The display panel according to claim 1 or 12, characterized in that, Also includes: A third functional layer is located on the side of the first functional layer away from the substrate; In a direction perpendicular to the plane of the substrate, the third functional layer and the encapsulation layer overlap; And / or, the third functional layer and the first functional layer do not overlap.

19. A display device, characterized in that, It includes at least one display panel as described in any one of claims 1-18.

20. The display device according to claim 19, characterized in that, The display device is composed of at least two display panels as described in any one of claims 1-18.

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