Display panel and display device

Abstract

The present disclosure relates to a display panel and a display device. The display panel comprises a substrate, a first insulating layer located on one side of the substrate, a second insulating layer located on a side of the first insulating layer away from the substrate, a plurality of undercut structures located in the first insulating layer and the second insulating layer, the undercut structure comprising an undercut sidewall, the undercut sidewall being jointly formed by the first insulating layer and the second insulating layer, and a plurality of light emitting units located on a side of the first insulating layer or the second insulating layer away from the substrate, at least part of the light emitting units not overlapping with the second insulating layer in a direction perpendicular to the plane on which the substrate is located. The display panel provided by the present disclosure removes the second insulating layer in part of the area, thereby suppressing the generation of leakage current, avoiding the crack generated by the second insulating layer from affecting the normal display of the light emitting unit, improving the display effect of the display panel, and also improving the light transmittance of the display panel.

Description

Technical Field

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

[0002] Tandem OLED (Tandem Organic Light-Emitting Diode) display panels have significant advantages in next-generation display technologies due to their high brightness, long lifespan, and high energy efficiency. However, due to limitations in manufacturing processes and material properties, non-ideal charge migration in the lateral (i.e., planar) direction of tandem OLEDs can cause lateral leakage, leading to reduced device efficiency and potentially accelerated material aging, thus shortening the lifespan of the display panel. Summary of the Invention

[0003] To address the aforementioned technical problems, this disclosure provides a display panel and a display device.

[0004] This disclosure provides a display panel, comprising: a substrate; a first insulating layer located on one side of the substrate; a second insulating layer located on the side of the first insulating layer away from the substrate; a plurality of undercut structures located in the first insulating layer and the second insulating layer, the undercut structure including an undercut sidewall formed by the first insulating layer and the second insulating layer; and a plurality of light-emitting units located on the side of the first insulating layer or the second insulating layer away from the substrate, wherein at least some of the light-emitting units do not overlap with the second insulating layer in a direction perpendicular to the plane of the substrate.

[0005] Based on the same inventive concept, this disclosure also provides a display device, including the display panel described in any one of the claims.

[0006] Compared with the prior art, the technical solution provided in this disclosure has the following advantages: The display panel provided in this disclosure cuts off the lateral transmission path of charge in the light-emitting unit through the undercut structure formed by the first insulating layer and the second insulating layer, thereby suppressing the generation of leakage current, improving the luminous efficiency of the device, suppressing material aging, and extending the service life of the display panel; At the same time, the display panel provided in this disclosure removes the second insulating layer in some areas to avoid the cracks generated by the second insulating layer affecting the normal display of the light-emitting unit, thereby improving the display effect of the display panel and also improving the light transmittance of the display panel. Attached Figure Description

[0007] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0008] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of a cross-sectional structure of an OLED in related technologies;

[0010] Figure 2 This is a schematic diagram of a cross-sectional structure of a Tandem OLED provided in an embodiment of this disclosure;

[0011] Figure 3 This is a partial cross-sectional structural diagram of a display panel provided in an embodiment of the present disclosure;

[0012] Figure 4 This is a partial planar structure diagram of a display panel provided in an embodiment of the present disclosure;

[0013] Figure 5 This is an enlarged cross-sectional view of a display panel provided in an embodiment of the present disclosure;

[0014] Figure 6 This is a partial cross-sectional structural diagram of another display panel provided in an embodiment of the present disclosure;

[0015] Figure 7 This is a partial planar structure diagram of another display panel provided in an embodiment of the present disclosure;

[0016] Figure 8 This is a partial cross-sectional structural diagram of another display panel provided in an embodiment of the present disclosure;

[0017] Figure 9 This is a partial cross-sectional structural diagram of another display panel provided in an embodiment of the present disclosure;

[0018] Figure 10 This is a partial cross-sectional structural diagram of another display panel provided in an embodiment of the present disclosure;

[0019] Figure 11 This is a schematic diagram of the planar structure of a display device provided in an embodiment of the present disclosure. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the embodiments of this disclosure, the solutions of the embodiments of this disclosure will be further described below. It should be noted that, unless otherwise specified, the embodiments of this disclosure and the features within them can be combined with each other.

[0021] Numerous specific details are set forth in the following description in order to provide a full understanding of the embodiments of this disclosure, but the embodiments of this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the embodiments of this disclosure, and not all embodiments.

[0022] Figure 1 This is a schematic diagram of a cross-sectional structure of an OLED display panel in the related technology, wherein, Figure 1 The diagram illustrates a cross-sectional structure of a conventional light-emitting unit (D0) in an OLED display panel. As shown, a conventional light-emitting unit D0 in an OLED display panel includes, in sequence, an anode, a hole injection layer (HIL), a hole transport layer (HTL), a compensation layer (Prime), a light-emitting layer (EML), a hole blocking layer (HBL), an electron transport layer (ETL), an electron injection layer (EIL), a cathode (Cathode), and a cover plate (CPL). The light-emitting unit D0 includes red, blue, and green light-emitting units. The compensation layer Prime, located at corresponding positions in each light-emitting unit D0, includes a red compensation layer (R-Prime), a blue compensation layer (B-Prime), and a green compensation layer (G-Prime), respectively, used to adjust the cavity length of each light-emitting unit D0, thereby regulating optical performance. Similarly, the light-emitting layer EML, located at corresponding positions in each light-emitting unit D0, includes a red light-emitting layer (R-EML), a blue light-emitting layer (B-EML), and a green light-emitting layer (G-EML), respectively. The compensation layer Prime and the light-emitting layer EML are stacked, and their sidewalls can be aligned.

[0023] The display principle of an OLED panel is as follows: a certain voltage is applied to the cathode and anode. Holes from the anode are injected into the hole transport layer (HTL) through the hole injection layer (HIL), while electrons from the cathode are injected into the electron transport layer (ETL) through the electron injection layer (EIL). Holes and electrons then migrate through the hole transport layer (HTL) and electron transport layer (ETL) to the light-emitting layer (EML), where they form excitons. These excitons excite the light-emitting molecules in the EML, causing it to emit light. The hole blocking layer (HBL) prevents holes from entering the electron transport layer (ETL) through the EML, allowing holes and electrons to combine and form excitons within the EML.

[0024] Figure 2 This is a schematic cross-sectional view of a Tandem OLED display panel provided in an embodiment of the present disclosure, wherein... Figure 2The diagram shows a cross-sectional view of the light-emitting unit D1 in a Tandem OLED display panel. The light-emitting unit in a Tandem OLED display panel is formed by stacking multiple conventional light-emitting units in series through a charge generation layer CGL. As shown in the figure, a single light-emitting unit D1 in a Tandem OLED display panel includes, in sequence: an anode, a hole injection layer HIL, a first hole transport layer HTL1, a first compensation layer Prime1, a first light-emitting layer EML1, a first hole blocking layer HBL1, a first electron transport layer ETL1, an N-type charge generation layer CGL-N, a P-type charge generation layer CGL-P, a second hole transport layer HTL2, a second compensation layer Prime2, a second light-emitting layer EML2, a second hole blocking layer HBL2, a second electron transport layer ETL2, an electron injection layer EIL, a cathode Cathode, and a cover plate CPL. The N-type charge generation layer CGL-N and the P-type charge generation layer CGL-P are used to generate holes and electrons, respectively, and a light-emitting layer is disposed between the electron transport layer and the hole transport layer.

[0025] The light-emitting unit D1 includes a red light-emitting unit, a blue light-emitting unit, and a green light-emitting unit. The first compensation layer Prime1 and the second compensation layer Prime2, respectively, include a red first compensation layer R-Prime1, a blue first compensation layer B-Prime1, a green first compensation layer G-Prime1, a red second compensation layer R-Prime2, a blue second compensation layer B-Prime2, and a green second compensation layer G-Prime2 at corresponding positions in each light-emitting unit D1. These layers are used to adjust the cavity length of each light-emitting unit D1, thereby regulating the optical performance. The first light-emitting layer EML1 and the second light-emitting layer EML2, respectively, include a red first light-emitting layer R-EML1, a blue first light-emitting layer B-EML1, a green first light-emitting layer G-EML1, a red second light-emitting layer R-EML2, a blue second light-emitting layer B-EML2, and a green second light-emitting layer G-EML2 at corresponding positions in each light-emitting unit D1. The compensation layers Prime1 and EML2 are stacked, and their sidewalls can be aligned.

[0026] Tandem OLED displays allow multiple stacked conventional light-emitting units to be driven at the same current density, significantly increasing brightness. Specifically, when multiple conventional light-emitting units are connected in series (e.g., two conventional units), the applied cathode voltage and current efficiency are doubled, while the constant current lifespan decays uniformly, resulting in a more than 100% increase in brightness lifespan and greater potential for lifespan improvement, along with advantages in power consumption. However, the significantly increased cathode voltage leads to greater leakage current in the lateral direction, causing more severe pixel overexposure, drastically reducing display quality, and causing issues such as decreased device efficiency, accelerated material aging, and a shortened lifespan.

[0027] In view of this, embodiments of the present disclosure provide a display panel, such as Figure 3 and Figure 4 As shown, it includes a substrate 1, a first insulating layer 21, a second insulating layer 22, and multiple light-emitting units D1. Among them, Figure 4 A schematic diagram of the planar structure of the display module is shown. Figure 3 It shows Figure 4 A schematic diagram of the cross-sectional structure of the display panel cut along L1.

[0028] The first insulating layer 21 is located on one side of the substrate 1, and the second insulating layer 22 is located on the side of the first insulating layer 21 away from the substrate 1. A plurality of light-emitting units D1 are located on the side of the first insulating layer 21 or the second insulating layer 22 away from the substrate 1.

[0029] In a specific implementation, a driving circuit layer 3 is further included between the substrate 1 and the first insulating layer 21 and the second insulating layer 22. The driving circuit layer 3 includes a pixel driving circuit 30, and the light-emitting unit D1 includes an anode. The pixel driving circuit 30 is connected to the anode through a metal via 301 located in the driving circuit layer 3 and provides a driving voltage to the light-emitting unit D1.

[0030] Specifically, the light-emitting unit D1 includes a common transport layer 50, which is formed by integral vapor deposition. The common transport layer 50 specifically includes... Figure 2 The illustrated embodiment includes at least one first hole transport layer HTL1, a first electron transport layer ETL1, a second hole transport layer HTL2, and a second electron transport layer ETL2. In other embodiments, the common transport layer 50 may further include... Figure 2 The hole injection layer HIL and / or electron injection layer EIL in the illustrated embodiment.

[0031] like Figure 3 and Figure 4As shown, the display panel also includes multiple undercut structures 20, which are located between the first insulating layer 21 and the second insulating layer 22, and are used to cut off the lateral transmission path of charge in the light-emitting unit D1, suppressing the generation of leakage current. Figure 3 As shown, the common transport layer 50 is disconnected at the undercut structure 20.

[0032] The undercut structure 20 includes an undercut sidewall 201, which is composed of a first insulating layer 21 and a second insulating layer 22.

[0033] Specifically, the first insulating layer 21 and the second insulating layer 22 are made of different materials. When the first insulating layer 21 and the second insulating layer 22 are etched simultaneously using the same process, the different etching rates caused by the materials result in the formation of an irregular rectangular undercut structure 20, which further suppresses the generation of leakage current.

[0034] like Figure 3 and Figure 4 As shown, in the direction z perpendicular to the plane of substrate 1, at least some of the light-emitting units D1 do not overlap with the second insulating layer 22.

[0035] In the actual production process of the display panel, the second insulating layer 22 can also be designed to be a full-layer structure, meaning that all the light-emitting units D1 in the display panel overlap with the second insulating layer 22. However, under this design, the second insulating layer 22 is prone to cracking under external stress and the influence of the gas under the display panel, especially in high-temperature and high-humidity environments. Cracks in the second insulating layer 22 will lead to poor contact between the metal via 301 located therein and the anode of the light-emitting unit D1, thereby affecting the transmission of the driving voltage and ultimately affecting the normal display of the light-emitting unit D1.

[0036] The display panel provided in this disclosure cuts off the lateral charge transmission path in the light-emitting unit through the undercut structure formed by the first insulating layer and the second insulating layer, thereby suppressing leakage current generation, improving device luminous efficiency, suppressing material aging, and extending the service life of the display panel. At the same time, the display panel provided in this disclosure removes the second insulating layer in some areas to avoid cracks in the second insulating layer affecting the normal display of the light-emitting unit, thereby improving the display effect of the display panel and also improving the light transmittance of the display panel.

[0037] In specific implementation, such as Figure 3 As shown, in the direction z perpendicular to the plane of substrate 1, the depth of the undercut structure 20 (including the portion located in the second insulating layer 22) is between 0.6 micrometers and 0.9 micrometers, as... Figure 4As shown, in the direction x parallel to the plane of substrate 1, the minimum width of the undercut structure 20 is between 1.5 micrometers and 3 micrometers, thus achieving a good leakage isolation effect without occupying the display panel area.

[0038] In specific implementation, when generating the first insulating layer 21, the second insulating layer 22, and the undercut structure 20, the undercut structure 20 can be generated first using the first insulating layer 21 and the second insulating layer 22, and then a portion of the second insulating layer 22 can be removed by etching with a mask while retaining the undercut sidewall 201 of the undercut structure 20; alternatively, a portion of the second insulating layer 22 can be removed by etching with a mask, and then the undercut structure 20 including the undercut sidewall 201 can be generated at the position where the second insulating layer 22 is retained.

[0039] In some embodiments, the light-emitting unit D1 includes a series structure of at least two stacked charge-generating layers, i.e., the light-emitting unit D1 is a Tandem OLED.

[0040] Specifically, the series structure of at least two stacked charge-generating layers can be Figure 2 The N-type charge generation layer CGL-N and the P-type charge generation layer CGL-P are shown in the embodiment.

[0041] In some embodiments, such as Figure 3 As shown, the display panel also includes a pixel definition layer 40, which is located on the side of the first insulating layer 21 or the second insulating layer 22 away from the substrate 1.

[0042] The display panel includes multiple pixel openings 41 in the pixel definition layer 40, and a light-emitting unit D1 is located in one pixel opening 41.

[0043] The display panel also includes multiple undercut openings 42 in the pixel definition layer 40, and the undercut sidewalls 201 of the undercut structure 20 are located in the undercut openings 42.

[0044] Specifically, the undercut structure 20 can be entirely located in the undercut opening 42 or partially located in the undercut opening 42, but its undercut sidewall 201 must be located in the undercut opening 42 in order to play the role of blocking leakage current.

[0045] It is understood that, in order to clearly illustrate the technical solution of this disclosure in the accompanying drawings, the thickness of each film layer of the display panel has been enlarged, and the thickness ratio of some film layers to other film layers has been adjusted. In practical applications, the thickness of the second insulating layer 22 is relatively thin. For the area where the second insulating layer 22 is removed, its final thickness is not much different from the area where the second insulating layer 22 is retained. If there is a large difference in thickness, it can also be compensated by correspondingly increasing the thickness of the first insulating layer 21 and / or the pixel definition layer 40. The accompanying drawings of other embodiments of this disclosure are similar and will not be described again.

[0046] It should be noted that, as Figure 4 As shown, although the common transmission layer 50 will cause leakage current, when the light-emitting unit D1 is displaying, it still needs to provide electrical signals to multiple light-emitting units D1 simultaneously through the common transmission layer 50. Therefore, the undercut structure 20 will not completely isolate each light-emitting unit D1.

[0047] In some embodiments, the first insulating layer 21 is made of organic material and the second insulating layer 22 is made of inorganic material.

[0048] Under the same etching process (e.g., chemical etching and dry etching), the etching rate of the first insulating layer 21 is greater than that of the second insulating layer 22, thereby forming... Figure 5 ( Figure 5 for Figure 3 The enlarged view of the display panel shows an undercut structure 20 with an inverted trapezoidal cross-section, where the angle α between the undercut sidewall 201 and the plane containing the substrate 1 is less than 90°. In this case, the transmission path of the lateral leakage current is more easily interrupted at the undercut sidewall 201, further suppressing the generation of leakage current.

[0049] Specifically, organic materials are mainly composed of covalent bonds such as carbon-carbon and carbon-hydrogen. These bonds are relatively strong but easily broken by reactive species (such as free radicals and ions) in chemical reagents or plasmas. Therefore, organic materials typically exhibit higher etching rates in chemical etching and dry etching. Inorganic materials, on the other hand, contain more complex bonding forms, such as metallic bonds, ionic bonds, and covalent bonds. For example, the silicon-oxygen bond in silicon dioxide is very strong and stable, requiring higher energy to break. Therefore, inorganic materials often have lower etching rates under the same conditions.

[0050] In some embodiments, such as Figure 6 and Figure 7 As shown ( Figure 7 A schematic diagram of the planar structure of the display module is shown. Figure 6 It shows Figure 7 (A schematic diagram of a partial cross-sectional structure of the display panel cut along L2) shows that the display panel includes a first region AA1. Within the first region AA1, in the direction perpendicular to the plane of the substrate 1, all light-emitting units D1 do not overlap with the second insulating layer 22. This is equivalent to retaining the second insulating layer 22 only at the locations where the undercut structure 20 needs to be generated, thereby minimizing the risk of cracks in the second insulating layer 22.

[0051] Specific implementation Figure 6 and Figure 7In the illustrated embodiment, a first insulating layer 21 of uniform thickness can be deposited on the display panel first. Then, an etching process is performed in the area corresponding to the second insulating layer 22 using a mask. Next, the second insulating layer 22 is deposited, and other areas of the second insulating layer 22 are etched away using a mask. Finally, the area where the first insulating layer 21 and the second insulating layer 22 overlap is etched using a mask to form the aforementioned undercut structure 20. Those skilled in the art can also form it using other methods and steps. Figure 6 and Figure 7 The structure shown is not further specified here.

[0052] In some embodiments, the display panel is a foldable display panel, which includes a bending area and a non-bending area, and the first area AA1 is located in the bending area.

[0053] Specifically, foldable display panels are made based on flexible display panels, requiring good flexibility in the bending areas to prevent damage or even failure. At this point, it is possible to... Figure 6 and Figure 7 The display panel of the illustrated embodiment is applied to the bending area without worrying about the risk of insulation layer cracking caused by bending stress.

[0054] In some embodiments, the light-emitting unit D1 includes a red light-emitting unit DR, a blue light-emitting unit DB, and a green light-emitting unit DG. An undercut structure 20 is located between the red light-emitting unit DR and the blue light-emitting unit DB, and / or, the undercut structure 20 is located between the red light-emitting unit DR and the green light-emitting unit DG.

[0055] In practice, the leakage current around the red light-emitting unit DR is usually greater than that of the blue light-emitting unit DB and the green light-emitting unit DG. Therefore, by setting an undercut structure 20 between the red light-emitting unit DR and other light-emitting units, a better leakage current suppression effect can be achieved by setting a smaller number of undercut structures 20.

[0056] Specifically, compared to blue and green, red organic light-emitting materials have a smaller band gap, typically around 1.6 to 2.0 electron volts (eV). A lower band gap means that electrons and holes can cross the energy barrier more easily, resulting in higher leakage current.

[0057] In some embodiments, such as Figure 8 As shown, the display panel includes a second region AA2. Within the second region AA2, in the direction z perpendicular to the plane of substrate 1, the green light-emitting unit DG overlaps with the second insulating layer 22, while the red light-emitting unit DR and the blue light-emitting unit DB do not overlap with the second insulating layer 22. The undercut structure 20 is located between the red light-emitting unit DR and the green light-emitting unit DG.

[0058] The human eye is most sensitive to green light; therefore, at the same brightness, the human eye perceives green more strongly. To improve the display effect of the display panel in the human eye and reduce panel power consumption, the display panel (including the aforementioned second area AA2) has the largest number of green light-emitting units (DG). A second insulating layer 22 is only placed under the green light-emitting units (DG), and an undercut structure 20 is only placed between the green light-emitting units (DG) and the red light-emitting units (DR) where leakage current is most severe. This increases the number of undercut structures 20, further suppressing leakage current.

[0059] In some embodiments, such as Figure 9 As shown, the system includes a third region AA3. Within the third region AA3, in a direction perpendicular to the plane of substrate 1, the green light-emitting unit DG does not overlap with the second insulating layer 22, while the red light-emitting unit DR and the blue light-emitting unit DB overlap with the second insulating layer 22. The undercut structure 20 is located between the red light-emitting unit DR and the green light-emitting unit DG, and the undercut structure 20 is also located between the blue light-emitting unit and either the red light-emitting unit DR or the green light-emitting unit DG.

[0060] The human eye is most sensitive to green light; therefore, at the same brightness, the human eye perceives green more strongly. To improve the display effect of the display panel in the human eye and reduce panel power consumption, the display panel (including the aforementioned second area AA3) has the largest number of green light-emitting units (DG). Removing the second insulating layer 22 beneath the green light-emitting units (DG) reduces the total area of ​​the second insulating layer 22, thereby further reducing the risk of cracking. Simultaneously, an undercut structure 20 is provided around the red light-emitting units (DR) to further suppress leakage current.

[0061] In some embodiments, such as Figure 10 As shown, this includes a fourth region AA4. Within the fourth region AA4, in a direction perpendicular to the plane of substrate 1, all light-emitting units D1 do not overlap with the second insulating layer 22. The undercut structure 20 is located between the red light-emitting unit DR and the blue light-emitting unit DB, and between the red light-emitting unit DR and the green light-emitting unit DG.

[0062] Based on the same inventive concept, corresponding to any of the methods in the above embodiments, this application also provides a display device, such as... Figure 11 As shown, it includes the display panel in any of the above embodiments.

[0063] The display device provided in this embodiment cuts off the lateral charge transmission path in the light-emitting unit through the undercut structure formed by the first insulating layer and the second insulating layer, thereby suppressing the generation of leakage current, improving the luminous efficiency of the device, suppressing material aging, and extending the service life of the display panel. At the same time, the display panel provided in this embodiment removes the second insulating layer in some areas to avoid the cracks generated by the second insulating layer affecting the normal display of the light-emitting unit, thereby improving the display effect of the display panel and also improving the light transmittance of the display panel.

[0064] Specifically, the aforementioned display devices can be 3C electronic products such as computers and their peripherals, communication devices, and consumer electronics, including smartphones, laptops, tablets, smart wearable devices, home appliances, gaming devices, and so on. Furthermore, these display devices can also be applied to other types of electronic devices such as automotive electronics.

[0065] In some embodiments, the display device is a foldable display device, which includes a bending region and a non-bending region. In the bending region, at least a portion of the light-emitting units D1 do not overlap with the second insulating layer 22 in a direction perpendicular to the plane of the substrate 1.

[0066] Specifically, foldable displays are made based on flexible display panels, which need to have good flexibility in the bending areas to avoid damage or even failure of the display panel. At this point, it is possible to... Figure 6 and Figure 7 The display panel of the illustrated embodiment is applied to the bending area of ​​the display device without worrying about the risk of insulation layer cracking caused by bending stress.

[0067] The apparatus of the above embodiments includes the corresponding display panel in any of the foregoing embodiments and has the beneficial effects of the corresponding embodiments, which will not be repeated here.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the aforementioned element.

[0069] The foregoing description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described above, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized in that, include: substrate; A first insulating layer is located on one side of the substrate; The second insulating layer is located on the side of the first insulating layer away from the substrate; Multiple undercut structures are located in the first insulating layer and the second insulating layer. Each undercut structure includes an undercut sidewall, which is jointly formed by the first insulating layer and the second insulating layer. Multiple light-emitting units are located on the side of the first insulating layer or the second insulating layer away from the substrate, and at least some of the light-emitting units do not overlap with the second insulating layer in a direction perpendicular to the plane of the substrate. First area; Within the first region, in a direction perpendicular to the plane of the substrate, none of the light-emitting units overlap with the second insulating layer.

2. The display panel according to claim 1, characterized in that, The first insulating layer is made of organic materials, and the second insulating layer is made of inorganic materials.

3. The display panel according to claim 1, characterized in that, The angle between the undercut sidewall and the plane of the substrate is less than 90°.

4. The display panel according to claim 1, characterized in that, It is a foldable display panel; The foldable display panel includes a bending area and a non-bending area, with the first area located in the bending area.

5. The display panel according to claim 1, characterized in that, The light-emitting unit includes a red light-emitting unit, a blue light-emitting unit, and a green light-emitting unit; The undercut structure is located between the red light-emitting unit and the blue light-emitting unit, and / or the undercut structure is located between the red light-emitting unit and the green light-emitting unit.

6. The display panel according to claim 5, characterized in that, Including the second region; Within the second region, in a direction perpendicular to the plane of the substrate, the green light-emitting unit overlaps with the second insulating layer, while the red and blue light-emitting units do not overlap with the second insulating layer. The undercut structure is located between the red light-emitting unit and the green light-emitting unit.

7. The display panel according to claim 5, characterized in that, Including the third region; Within the third region, in a direction perpendicular to the plane of the substrate, the green light-emitting unit does not overlap with the second insulating layer, while the red and blue light-emitting units overlap with the second insulating layer. The undercut structure is located between the red light-emitting unit and the green light-emitting unit, and the undercut structure is also located between the blue light-emitting unit and either the red light-emitting unit or the green light-emitting unit.

8. The display panel according to claim 1, characterized in that, Also includes: A pixel definition layer is located on the side of the first insulating layer or the second insulating layer away from the substrate; Multiple pixel openings are located in the pixel definition layer, and one light-emitting unit is located in one of the pixel openings; Multiple undercut openings are located in the pixel definition layer, and the undercut sidewalls of the undercut structure are located in the undercut openings.

9. The display panel according to claim 1, characterized in that, The light-emitting unit includes a series structure of at least two stacked charge-generating layers.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 9.

11. The display device according to claim 10, characterized in that, The device is a foldable display device, which includes a bending area and a non-bending area; In the bending region, at least a portion of the light-emitting units do not overlap with the second insulating layer in a direction perpendicular to the plane of the substrate.

Images