Display panel and display device

Abstract

The invention relates to a display panel and a display device. The display panel includes: a substrate; the first insulating layer is positioned on one side of the substrate; the second insulating layer is located on the side, away from the substrate, of the first insulating layer; the plurality of undercut structures are located in the first insulating layer and the second insulating layer, each undercut structure comprises an undercut side wall, and the undercut side wall is jointly formed by the first insulating layer and the second insulating layer; the light emitting units are located on the side, away from the substrate, of the first insulating layer or the second insulating layer, and at least part of the light emitting units are not overlapped with the second insulating layer in the direction perpendicular to the plane where the substrate is located. According to the display panel provided by the invention, the second insulating layer is removed from part of the area, so that the generation of leakage current is inhibited, the influence of cracks generated by the second insulating layer on normal display of the light emitting unit is avoided, the display effect of the display panel is improved, and the light transmittance of the display panel can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Tandem OLED (Tandem Organic Light-Emitting Diode) display panels have great advantages in the new generation of display technology due to their high brightness, long life and high energy efficiency. However, due to the limitations of the manufacturing process and the characteristics of the materials, the non-ideal migration of charges in the lateral direction (i.e. in the plane direction) of the Tandem OLED will produce lateral leakage, resulting in reduced device efficiency and accelerated aging of the material, shortening the service life of the display panel. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure provides a display panel and a display device.

[0004] The present 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 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 structures comprising undercut sidewalls, the undercut sidewalls being jointly constituted by the first insulating layer and the second insulating layer; 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 some of the light-emitting units not overlapping with the second insulating layer in a direction perpendicular to a plane where the substrate is located.

[0005] Based on the same inventive concept, the present disclosure also provides a display device, comprising any one of the display panels described.

[0006] The technical solution provided by the present disclosure has the following advantages over the prior art: the display panel provided by the present disclosure cuts off the lateral transmission path of the charge in the light-emitting unit through the bottom cut structure generated 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 improving the service life of the display panel; at the same time, the display panel provided by the present disclosure removes the second insulating layer in part of the area to avoid the cracks generated in the second insulating layer from affecting the normal display of the light-emitting unit, thereby improving the display effect of the display panel and also being able to improve the light transmittance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0009] Figure 1 A schematic diagram of a cross-sectional structure of an OLED in the related art;

[0010] Figure 2 A schematic diagram of a cross-sectional structure of a Tandem OLED provided in an embodiment of the present disclosure;

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

[0012] Figure 4 A partial planar structural schematic diagram of a display panel provided in an embodiment of the present disclosure;

[0013] Figure 5 A partially enlarged schematic diagram of a cross-sectional structure of a display panel provided by an embodiment of the present disclosure;

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

[0015] Figure 7 A partial planar structural schematic diagram of another display panel provided in an embodiment of the present disclosure;

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

[0017] Fig. 9 A partial cross-sectional structural schematic diagram of another display panel provided in an embodiment of the present disclosure;

[0018] Fig.10 A partial cross-sectional structural schematic diagram of another display panel provided in an embodiment of the present disclosure;

[0019] Fig.11 A schematic diagram of the planar structure of a display device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present disclosure, the scheme of the embodiments of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the embodiments of the present disclosure, but the embodiments of the present disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0022] Figure 1 is a schematic diagram of a cross-sectional structure of an OLED display panel in the related art, wherein: Figure 1 The schematic diagram of the cross-sectional structure of a conventional light-emitting unit D0 of an OLED display panel is specifically shown. As shown in the figure, a conventional light-emitting unit D0 of an OLED display panel includes an anode 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 stacked in sequence. The light-emitting unit D0 includes a red light-emitting unit, a blue light-emitting unit and a green light-emitting unit. The compensation layer Prime includes a red compensation layer R-Prime, a blue compensation layer B-Prime and a green compensation layer G-Prime at the corresponding position of each light-emitting unit D0, respectively, which are used to adjust the cavity length of each light-emitting unit D0, and then adjust the optical performance. The light-emitting layer EML includes a red light-emitting layer R-EML, a blue light-emitting layer B-EML and a green light-emitting layer G-EML at the corresponding position of each light-emitting unit D0. The compensation layer Prime and the light-emitting layer EML are stacked and the side walls can be aligned.

[0023] The display principle of the OLED display panel is to apply a certain voltage to the cathode Cathode and the anode Anode respectively, the holes from the anode Anode are injected into the hole transport layer HTL through the hole injection layer HIL, and the electrons from the cathode Cathode are injected into the electron transport layer ETL through the electron injection layer EIL. The holes and electrons migrate to the light-emitting layer EML through the hole transport layer HTL and the electron transport layer ETL respectively, and form excitons in the light-emitting layer EML, and the excitons excite the light-emitting molecules in the light-emitting layer EML to emit light. Among them, the hole blocking layer HBL is used to block holes from passing through the light-emitting layer EML into the electron transport layer ETL, so that the holes and electrons are combined in the light-emitting layer EML to form excitons.

[0024] Figure 2 A schematic diagram of a cross-sectional structure of a Tandem OLED display panel provided in an embodiment of the present disclosure, wherein: Figure 2The schematic diagram of the cross-sectional structure of the light-emitting unit D1 of the Tandem OLED display panel is specifically shown. The light-emitting unit in the 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 light-emitting unit D1 of the Tandem OLED display panel includes an anode 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. Among them, 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 provided 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 the corresponding positions of each light-emitting unit D1, respectively, and are used to adjust the cavity length of each light-emitting unit D1, thereby adjusting 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 the corresponding positions of each light-emitting unit D1. The compensation layer Prime and the light-emitting layer EML are stacked, and the side walls can be aligned.

[0026] Tandem OLED display panels enable multiple stacked conventional light-emitting units to be driven at the same current density, thereby greatly improving the brightness of the display panel. Specifically, when the Tandem OLED display panel connects multiple conventional light-emitting units in series, such as when two conventional light-emitting units are connected in series, the applied cathode voltage will be doubled, the current efficiency will also be doubled, and the constant current life decay will be consistent, so the corresponding brightness life will be more than doubled, the potential for life improvement is greater, and the power consumption is also advantageous. However, as the cathode voltage increases exponentially, the Tandem OLED display panel will generate a larger leakage current in the lateral direction, resulting in more serious pixel stealing, greatly reducing the display effect of the display panel, and will also lead to problems such as reduced device efficiency and accelerated material aging, shortening the service life of the display panel.

[0027] In view of this, an embodiment of the present disclosure provides 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 a plurality of light-emitting units D1. Figure 4 shows a schematic diagram of the planar structure of the display module, Figure 3 Shows Figure 4 Schematic diagram of the partial 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 , the second insulating layer 22 is located on a side of the first insulating layer 21 away from the substrate 1 , and a plurality of light emitting units D1 are located on a 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 also 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. The light-emitting unit D1 includes an anode Anode. The pixel driving circuit 30 is connected to the anode 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 transmission layer 50, and the common transmission layer 50 is formed by whole-layer evaporation. The common transmission layer 50 specifically includes Figure 2 In the embodiment shown, at least one of the first hole transport layer HTL1, the first electron transport layer ETL1, the second hole transport layer HTL2 and the second electron transport layer ETL2. In other implementations, the common transport layer 50 may also include Figure 2 The hole injection layer HIL and / or the electron injection layer EIL in the illustrated embodiments.

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

[0032] The undercut structure 20 includes an undercut sidewall 201 , and the undercut sidewall 201 is formed by 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, due to the different etching rates caused by the materials, an irregular rectangular undercut structure 20 can be formed, further suppressing the generation of leakage current.

[0034] like Figure 3 and Figure 4 As shown, in the direction z perpendicular to the plane where the substrate 1 is located, at least a portion of the light emitting unit D1 does 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 laid in a whole layer, that is, 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 the action of external stress and the gas under the display panel, especially in a high temperature and high humidity environment. The cracking of the second insulating layer 22 will cause the metal via 301 located therein to have poor contact with the anode 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 by the embodiment of the present disclosure cuts off the lateral transmission path of the charge in the light-emitting unit through the bottom cut structure generated 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 improving the service life of the display panel; at the same time, the display panel provided by the embodiment of the present disclosure removes the second insulating layer in part of the area to avoid the cracks generated 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 being able to improve the light transmittance of the display panel.

[0037] When implementing it, Figure 3 As shown, in the direction z perpendicular to the plane where the substrate 1 is located, 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. Figure 4As shown, in the direction x parallel to the plane where the substrate 1 is located, the minimum width of the undercut structure 20 is between 1.5 microns and 3 microns, thereby being able to achieve a better leakage isolation effect without occupying the display panel area.

[0038] In a specific implementation, when generating the above-mentioned first insulating layer 21, second insulating layer 22 and undercut structure 20, the undercut structure 20 can be first generated 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 through a mask plate, while retaining the undercut sidewall 201 of the undercut structure 20; or a portion of the second insulating layer 22 can be first removed by etching through a mask plate, and then an undercut structure 20 including the undercut sidewall 201 is 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 generation layers, that is, the light-emitting unit D1 is a Tandem OLED.

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

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

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

[0043] The display panel further includes a plurality of undercut openings 42 in the pixel definition layer 40 , and the undercut sidewalls 201 of the undercut structures 20 are located in the undercut openings 42 .

[0044] Specifically, the undercut structure 20 may be completely 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 to play a role in isolating leakage current.

[0045] It is understandable that in order to make the drawings clearly reflect the technical solution of the present disclosure, the thickness of each film layer of the display panel is enlarged, and the thickness ratio of some film layers to other film layers is adjusted. In practical applications, the thickness of the second insulating layer 22 is relatively thin, and the final thickness of the area where the second insulating layer 22 is removed is not much different from that of 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 same is true for the drawings of other embodiments of the present disclosure, and will not be repeated.

[0046] It should be noted that if Figure 4 As shown, although the common transmission layer 50 may cause leakage current, the light emitting unit D1 still needs to provide electrical signals to multiple light emitting units D1 simultaneously through the common transmission layer 50 when displaying, so 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 an organic material, and the second insulating layer 22 is made of an inorganic material.

[0048] Under the same etching process (such as chemical etching and dry etching), the etching rate of the first insulating layer 21 is greater than the etching rate of the second insulating layer 22, thereby forming Figure 5 ( Figure 5 for Figure 3 The cross-sectional shape of the bottom cut structure 20 shown in the partial enlarged view of the display panel is an inverted trapezoid, and the angle α between the bottom cut side wall 201 and the plane where the substrate 1 is located is less than 90°. At this time, the transmission path of the lateral leakage current is more easily cut off at the bottom cut side wall 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 interrupted by active species in chemical reagents or plasma (such as free radicals, ions, etc.). Therefore, organic materials usually exhibit higher etching rates in chemical etching and dry etching. Inorganic materials 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, and requires higher energy to break. Therefore, inorganic materials tend to have lower etching rates under the same conditions.

[0050] In some embodiments, Figure 6 and Figure 7 As shown ( Figure 7 shows a schematic diagram of the planar structure of the display module, Figure 6 Shows Figure 7 ), the display panel includes a first area AA1. In the first area AA1, in a direction perpendicular to the plane where the substrate 1 is located, all the light-emitting units D1 do not overlap with the second insulating layer 22, which is equivalent to retaining the second insulating layer 22 only at the position 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 embodiment shown, a first insulating layer 21 with uniform thickness can be first deposited on the display panel, and the area corresponding to the second insulating layer 22 can be etched through a mask plate, and then the second insulating layer 22 is deposited, and the second insulating layer 22 in other areas is etched through the mask plate, and finally the above-mentioned undercut structure 20 is formed by etching in the area where the first insulating layer 21 and the second insulating layer 22 overlap. Those skilled in the art can also form the undercut structure 20 through other methods and steps. Figure 6 and Figure 7 The structure shown here is not too limited.

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

[0053] Specifically, the foldable display panel is made based on a flexible display panel, which needs to have good flexibility in the bending area to avoid damage or even failure of the display panel. Figure 6 and Figure 7 The display panel of the embodiment shown is applied to the bending area without worrying about the risk of cracks in the insulation layer 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. The 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 a specific implementation, the leakage current around the red light-emitting unit DR is usually greater than that around the blue light-emitting unit DB and the green light-emitting unit DG. Therefore, an undercut structure 20 is set between the red light-emitting unit DR and the other light-emitting units. By setting a smaller number of undercut structures 20, a better leakage current suppression effect can be achieved.

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

[0057] In some embodiments, Figure 8 As shown, the display panel includes a second area AA2. In the second area AA2, in a direction z perpendicular to the plane where the substrate 1 is located, the green light emitting unit DG overlaps with the second insulating layer 22, and 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, so at the same brightness, the human eye perceives green more strongly. In order to improve the display effect of the display panel in the human eye and reduce the panel power consumption, the number of green light-emitting units DG is the largest in the display panel (including the second area AA2). The second insulating layer 22 is only set under the green light-emitting unit DG, and the undercut structure 20 is only set between the green light-emitting unit DG and the red light-emitting unit DR where the leakage current phenomenon is the most serious, so that the number of undercut structures 20 is increased to further suppress the leakage current.

[0059] In some embodiments, Fig. 9 As shown, the third area AA3 is included. In the third area AA3, in a direction perpendicular to the plane where the substrate 1 is located, the green light emitting unit DG does not overlap with the second insulating layer 22, and 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 the red light emitting unit DR or the green light emitting unit DG.

[0060] The human eye is most sensitive to green light, so at the same brightness, the human eye perceives green more strongly. In order to improve the display effect of the display panel in the human eye and reduce the panel power consumption, the number of green light-emitting units DG is the largest in the display panel (including the second area AA3). Removing the second insulating layer 22 set under the green light-emitting unit DG can reduce the total area of ​​the second insulating layer 22, thereby further reducing the risk of cracks. At the same time, an undercut structure 20 is set around the red light-emitting unit DR to further suppress leakage current.

[0061] In some embodiments, Fig.10 As shown, it includes a fourth area AA4. In the fourth area AA4, in a direction perpendicular to the plane where the substrate 1 is located, all the 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 above-mentioned embodiments and methods, the present application also provides a display device, such as Fig.11 As shown, it includes the display panel panel in any of the above embodiments.

[0063] The display device provided by the embodiment of the present disclosure cuts off the lateral transmission path of the charge in the light-emitting unit through the bottom cut structure generated 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 improving the service life of the display panel; at the same time, the display panel provided by the embodiment of the present disclosure removes the second insulating layer in part of the area to avoid the cracks generated in the second insulating layer from affecting the normal display of the light-emitting unit, thereby improving the display effect of the display panel and also being able to improve the light transmittance of the display panel.

[0064] Specifically, the display device can be a 3C electronic product such as a computer and its peripherals, communications and consumer electronics, for example, a smart phone, a laptop computer, a tablet computer, a smart wearable device, a home appliance, a gaming device, etc. In addition, the display device 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 area and a non-bending area. In the bending area, in a direction perpendicular to the plane where the substrate 1 is located, at least part of the light emitting unit D1 does not overlap with the second insulating layer 22 .

[0066] Specifically, the foldable display device is made based on a flexible display panel, which needs to have good flexibility in the bending area to avoid damage or even failure of the display panel. Figure 6 and Figure 7 The display panel of the embodiment shown is applied to the bending region of the display device without worrying about the risk of cracks in the insulating layer caused by bending stress.

[0067] The device of the above embodiment includes the corresponding display panel in any of the above embodiments, and has the beneficial effects of the corresponding embodiment, which will not be described in detail here.

[0068] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the above elements.

[0069] The above are only specific embodiments of the present disclosure, which enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be 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 the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described above, but will conform to 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, 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 are located in the first insulating layer and the second insulating layer, the undercut structures comprising undercut sidewalls, and the undercut sidewalls are formed by the first insulating layer and the second insulating layer; A plurality of light emitting units are located on a side of the first insulating layer or the second insulating layer away from the substrate, and in a direction perpendicular to a plane where the substrate is located, at least some of the light emitting units do not overlap with the second insulating layer.

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

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

4. The display panel according to claim 1, characterized in that: Includes the first area; In the first region, in a direction perpendicular to the plane where the substrate is located, all the light emitting units do not overlap with the second insulating layer.

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

6. The display panel according to claim 1, characterized in that: The light-emitting units include 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.

7. The display panel according to claim 6, characterized in that: Includes the second area; In the second region, in a direction perpendicular to the plane where the substrate is located, the green light emitting unit overlaps with the second insulating layer, and the red light emitting unit and the blue light emitting unit 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.

8. The display panel according to claim 6, characterized in that: Includes the third region; In the third region, in a direction perpendicular to the plane where the substrate is located, the green light emitting unit does not overlap with the second insulating layer, and the red light emitting unit and the blue light emitting unit 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 the red light emitting unit or the green light emitting unit.

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

10. 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.

11. A display device, characterized in that: A display panel comprising any one of claims 1 to 10.

12. The display device according to claim 11, characterized in that: A foldable display device comprising a bending area and a non-bending area; In the bending region in a direction perpendicular to the plane where the substrate is located, at least a portion of the light emitting unit does not overlap with the second insulating layer.

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