Display panel and display device

Abstract

The present disclosure provides a display panel and a display device, and relates to the technical field of display, the display panel comprises a substrate, a plurality of light emitting units, a pixel definition layer and an undercut structure; the pixel definition layer comprises a first sub-film layer and a second sub-film layer, the materials of the first sub-film layer and the second sub-film layer are not completely same, the second sub-film layer comprises a plurality of unconnected sub-regions; the undercut structure is located in the pixel definition layer, and the first sub-film layer and the second sub-film layer participate in constituting the undercut structure. The present disclosure sets the undercut structure, so that the film layer located on the side of the first sub-film layer away from the substrate produces a fault at the undercut structure or a poor contact connection effect, which is beneficial to reduce or block the horizontal leakage, improve the crosstalk phenomenon of the display panel, and thus improve the display effect of the display panel. In addition, the second sub-film layer is not laid in an integral layer, which is beneficial to improve the light transmittance of the display panel and improve the accuracy of fingerprint identification when the fingerprint identification function needs to be realized in the display panel.

Description

Technical Field

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

[0002] With the continuous development of science and technology, more and more display products are being widely used in people's daily lives and work, bringing great convenience and becoming indispensable tools. However, some display products suffer from serious crosstalk problems, resulting in poor display quality. Therefore, solving this problem has become one of the urgent technical issues to be addressed. Summary of the Invention

[0003] To address the aforementioned technical problems, this disclosure provides a display panel and a display device to improve crosstalk issues in display products, thereby enhancing display performance.

[0004] In a first aspect, this disclosure provides a display panel, comprising:

[0005] substrate;

[0006] Multiple light-emitting units are located on one side of the substrate;

[0007] A pixel definition layer is located on one side of the substrate. The pixel definition layer includes a first sub-film layer and a second sub-film layer. The first sub-film layer is located on the side of the second sub-film layer away from the substrate. The materials of the first sub-film layer and the second sub-film layer are not completely the same. The second sub-film layer includes multiple non-connected sub-regions.

[0008] Multiple undercut structures are located in the pixel definition layer, with the first sub-film layer and the second sub-film layer participating in the formation of the undercut structure.

[0009] Secondly, based on the same inventive concept, this disclosure provides a display device including the display panel described in the first aspect.

[0010] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0011] This disclosure provides a display panel and a display device. An undercut structure is provided in the display panel, wherein the undercut structure is composed of a first sub-film layer and a second sub-film layer in a pixel definition layer. By providing the undercut structure, this disclosure causes a break or poor contact connection at the undercut point in the film layer located on the side of the first sub-film layer away from the substrate. Therefore, electrons and holes are less likely to propagate within the film layer, thereby reducing or blocking lateral leakage and improving crosstalk in the display panel, thus enhancing the display effect. Furthermore, this disclosure allows the second sub-film layer to be multiple non-adjacent sub-regions, rather than a single layer. This improves the light transmittance of the display panel and enhances the accuracy of fingerprint recognition when fingerprint recognition functionality is required. Attached Figure Description

[0012] 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.

[0013] 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.

[0014] Figure 1 The diagram shown is a schematic of a film layer in a display panel in the prior art;

[0015] Figure 2 The figure shown is a schematic diagram of a planar structure of a display panel provided in an embodiment of this disclosure;

[0016] Figure 3 The diagram shown is a schematic diagram of a film layer of a display panel provided in an embodiment of this disclosure;

[0017] Figure 4 The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of this disclosure;

[0018] Figure 5 The diagram shown is a schematic representation of a local membrane layer provided in an embodiment of this disclosure;

[0019] Figure 6 The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of this disclosure;

[0020] Figure 7 The diagram shown is a schematic diagram of another planar structure of the display panel provided in an embodiment of this disclosure;

[0021] Figure 8 The diagram shown is a schematic diagram of another film layer of a display panel provided in an embodiment of this disclosure;

[0022] Figure 9 The diagram shown is a schematic representation of another planar structure of a display panel provided in an embodiment of this disclosure;

[0023] Figure 10 The diagram shown is a schematic diagram of another film layer of a display panel provided in an embodiment of this disclosure;

[0024] Figure 11 The figure shown is a schematic diagram of a planar structure of a display device provided in an embodiment of this disclosure. Detailed Implementation

[0025] 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.

[0026] Numerous specific details are set forth in the following description to provide a thorough understanding of the embodiments of this disclosure. However, 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 a part of the embodiments of this disclosure, and not all of them. The inventors discovered in their research that some display panels include film layers with poor insulation properties and are deposited as a single vapor layer. For example, the display panel includes tandem light-emitting units. Figure 1 The diagram shown is a schematic of a film layer in a display panel in the prior art. Please refer to it. Figure 1 The light-emitting units 20' are connected by a connecting layer, which includes a negative charge generation layer NCGL' for generating electrons and a positive charge generation layer PCGL' for generating holes. To save manufacturing costs, the negative charge generation layer NCGL' and the positive charge generation layer NCGL' are typically formed by integral vapor deposition using a conventional metal mask (CMM). However, due to the high conductivity of the materials used in the negative charge generation layer NCGL' and the positive charge generation layer PCGL', severe lateral leakage occurs, leading to crosstalk between adjacent light-emitting units. This results in deviations in the color or brightness of the light-emitting units, affecting the display effect. This is especially true for low grayscale displays, where the current of the light-emitting units is lower. When lateral leakage is severe, they are more susceptible to interference, causing color shifts in the display panel and affecting its display performance.

[0027] Therefore, how to solve the above problems has become one of the urgent technical issues to be addressed at this stage.

[0028] In view of this, the present disclosure provides a display panel and a display device to improve the crosstalk problem of display products, thereby improving the display effect.

[0029] Figure 2 The figure shown is a schematic diagram of a planar structure of a display panel provided in an embodiment of this disclosure. Figure 3 The diagram shown is a schematic representation of a film layer in a display panel according to an embodiment of this disclosure. Please refer to it. Figure 2 and Figure 3 This disclosure provides a display panel 100, including: a substrate 10, a plurality of light-emitting units 20, a pixel definition layer 30, and a plurality of undercut structures 40. The display panel 100 includes a plurality of light-emitting units 20, which are located on one side of the substrate 10; the pixel definition layer 30 is located on one side of the substrate 10, and the pixel definition layer 30 includes a first sub-film layer 31 and a second sub-film layer 32, the first sub-film layer 31 being located on the side of the second sub-film layer 32 away from the substrate 10, the materials of the first sub-film layer 31 and the second sub-film layer 32 being not completely identical, and the second sub-film layer 32 including a plurality of non-connected sub-regions 320; the plurality of undercut structures 40 are located in the pixel definition layer 30, and the first sub-film layer 31 and the second sub-film layer 32 participate in forming the undercut structures 40.

[0030] It should be noted that, Figure 2 The description only uses a rectangular display panel 100 as an example and does not limit the actual shape of the display panel 100. In some other embodiments of this disclosure, the display panel 100 may also be a circle, a rounded rectangle or any other feasible shape. Figure 2 The light-emitting unit 20 in the diagram is for illustrative purposes only, and its number does not represent the actual number of light-emitting units 20 in the display panel 100.

[0031] Specifically, the substrate 10 in the display panel 100 supports the films and devices thereon. The substrate 10 can be a rigid substrate or a flexible substrate. The substrate 10 also includes an array layer comprising multiple pixel driving circuits, each of which drives a corresponding connected light-emitting unit 20 to emit light. Optionally, the display panel 100 provided in this embodiment can be a display panel 100 employing organic light-emitting diode (OLED) display technology, i.e., an OLED display panel. The connection relationship between the light-emitting unit 20 and the pixel driving unit can be appropriately referenced. Figure 4 , Figure 4 The diagram shown is a schematic representation of another film layer of the display panel provided in this embodiment. Please refer to [the diagram]. Figure 4The pixel driving circuit includes a driving transistor T0, which is electrically connected to the light-emitting unit 20. The light-emitting unit 20 includes a first electrode 201, a light-emitting material layer 202, and a second electrode layer 203. When the pixel driving circuit provides an appropriate voltage, holes generated by the first electrode 201 and electrons generated by the second electrode layer 203 combine in the light-emitting material layer 202 to produce light. The pixel definition layer 30 is located on the side of the first electrode 201 away from the substrate 10. The pixel definition layer 30 includes multiple pixel openings, and the light-emitting units 20 are disposed within the pixel openings. The light-emitting units 20 can be, but are not limited to, various colors such as red light-emitting units 20, green light-emitting units 20, and blue light-emitting units 20.

[0032] It should be noted that this disclosure Figure 4 In this paper, only the second electrode layer 203 is shown above the first sub-film layer 31. This disclosure uses the second electrode layer 203 as an example to illustrate that the undercut structure 40 can cause the film layer on the side of the first sub-film layer 31 away from the substrate 10 to have a discontinuity or poor contact connection, but it is not limited thereto. Similarly, Figure 8 and Figure 10 Only one film layer is shown on the side of the undercut structure away from the substrate 10. Other film layers are also included above the undercut structure 40. Optionally, on the side of the undercut structure away from the substrate 10, there are also whole-layer vapor-deposited film layers such as hole injection layer, hole transport layer, electron transport layer and electron injection layer. This disclosure is only used as an example for illustration and is not limited thereto.

[0033] It is understandable that for some of the film layers in the display panel 100 with poor insulation and solid vapor deposition, electrons and holes can travel smoothly within the film layer, resulting in severe lateral leakage. This leads to crosstalk between adjacent light-emitting units 20, causing deviations in the color or brightness of the light-emitting units 20 and affecting the display effect. For example, please refer to the figure. Figure 3 When the display panel 100 includes series-type light-emitting units, a charge generation layer CGL for connecting the light-emitting units is included between the pixel definition layer 30 and the second electrode layer 203. The charge generation layer includes a negative charge generation layer NCGL and a positive charge generation layer NCGL. The charge generation layer CGL is a film layer that is vapor-deposited as a whole layer and has good conductivity. However, the lateral leakage in the charge generation layer CGL is serious, and the crosstalk problem between adjacent light-emitting units 20 is serious.

[0034] Therefore, the display panel 100 provided in this embodiment improves the crosstalk problem in the display panel 100 by setting the undercut structure 40. Specifically, the pixel definition layer 30 includes a first sub-film layer 31 and a second sub-film layer 32 stacked together, with the second sub-film layer 32 located between the substrate 10 and the first sub-film layer 31. The materials of the first sub-film layer 31 and the second sub-film layer 32 are not completely the same. Here, "not completely the same material" means that the first sub-film layer 31 and the second sub-film layer 32 can use the same type of material, but the materials used have at least one different property. Optionally, the first sub-film layer 31 and the second sub-film layer 32 are both organic films. Under the same process conditions, the etching rate of the second sub-film layer 32 is greater than the etching rate of the first sub-film layer 31, so that the first sub-film layer 31 and the second sub-film layer 32 together constitute the undercut structure 40. In an optional embodiment of this disclosure, the first sub-film layer 31 and the second sub-film layer 32 are first deposited as a whole layer of material (usually photoresist) during fabrication, and then etched by an etching process to pattern the deposited material. Ashing is a process that uses plasma to remove a small amount of photoresist. Under the same ashing conditions, since the etching rate of the first sub-film layer 31 is lower than that of the second sub-film layer 32, and with the corresponding mask pattern, an undercut structure 40 can be formed in the overlapping area of ​​the first sub-film layer 31 and the second sub-film layer 32.

[0035] The undercut structure 40 in this disclosure causes a break or poor contact connection at the undercut structure 40 in the film layers (e.g., the negative charge generation layer NCGL and the positive charge generation layer NCGL) located on the side of the first sub-film layer 31 away from the substrate 10. This makes it difficult for electrons and holes to transport within the film layers, thereby reducing or blocking lateral leakage and improving crosstalk in the display panel 100, thus enhancing its display performance. Furthermore, this disclosure allows the second sub-film layer 32 to consist of multiple non-adjacent sub-regions 320, rather than a single, continuous layer. This improves the light transmittance of the display panel 100 and enhances the accuracy of fingerprint recognition when fingerprint recognition functionality is required in the display panel 100.

[0036] Further, please refer to Figure 3To improve the brightness, lifespan, and efficiency of the display panel 100, in one optional embodiment of this disclosure, the light-emitting unit 20 includes a series structure of at least two stacked charge-generating layers CGL. Specifically, the light-emitting units 20 are connected in series to form a series-type light-emitting unit 20. The charge-generating layer CGL includes a negative charge-generating layer NCGL for generating electrons and a positive charge-generating layer PCGL for generating holes. The negative charge-generating layer NCGL and the positive charge-generating layer NCGL are located above the undercut structure 40. To save manufacturing costs, the negative charge-generating layer NCGL and the positive charge-generating layer NCGL are usually formed by solid-state vapor deposition using a conventional metal mask (CMM). However, due to the good conductivity of the materials of the negative charge-generating layer NCGL and the positive charge-generating layer PCGL, severe lateral leakage occurs, leading to crosstalk between adjacent light-emitting units 20. This results in deviations in the color or brightness of the light-emitting units 20, affecting the display effect. Especially for low grayscale displays, the current of the light-emitting unit 20 is relatively small. When lateral leakage is severe, it is more susceptible to interference, leading to color shift in the display panel 100 and affecting its display performance. Therefore, this application addresses this by setting an undercut structure 40, which creates a break or poor contact connection between the negative charge generation layer NCGL and the positive charge generation layer NCGL at the undercut structure 40. This makes it difficult for electrons and holes to transport within the film layers, reducing or blocking lateral leakage, which helps to improve crosstalk in the display panel 100 and enhance its display performance.

[0037] Optionally, the undercut structure 40 is located between different light-emitting units 20, and the undercut structure 40 is not included between series-type light-emitting units 20. This helps to reduce or avoid lateral leakage between different light-emitting units 20, improve crosstalk between light-emitting units 20, and prevent series-type light-emitting units 20 from being disconnected, thus preventing series-type light-emitting units 20 from becoming individual light-emitting units 20.

[0038] Please refer to Figure 3 In one optional embodiment of this disclosure, the light transmittance of the material in the second sub-film layer 32 is less than that in the first sub-film layer 31. That is, the second sub-film layer 32 has a higher light absorption rate than the first sub-film layer 31, meaning less light can pass through it than can pass through the first sub-film layer 31. Optionally, the first sub-film layer 31 is a transparent or nearly transparent material, and the second sub-film layer 32 is a black material. Figure 3As shown, the second sub-film layer 32 is located between adjacent light-emitting units 20 along the first direction F1. The material of the second sub-film layer 32 has a low light transmittance, which helps to prevent light from interfering with each other between different light-emitting units 20, improves the crosstalk problem of the display panel 100, and thus helps to improve the display effect of the display panel 100.

[0039] Figure 5 The diagram shown is a partial film layer provided in an embodiment of this disclosure. Please refer to it. Figure 3 and Figure 5 The undercut structure 40 disclosed herein is a groove-like structure. The undercut structure 40 has a sidewall 41. Optionally, the angle α between the sidewall 41 of the undercut structure 40 and the plane of the substrate 10 is less than 90°.

[0040] Specifically, when the angle α between the sidewall 41 of the undercut structure 40 and the plane of the substrate 10 is greater than or equal to 90°, the opening of the undercut structure 40 is small, resulting in a shadowing effect during the subsequent film fabrication process, leading to uneven material deposition. When the angle α between the sidewall 41 of the undercut structure 40 and the plane of the substrate 10 is less than 90°, it is beneficial to make the film layer located on the side of the first sub-film layer 31 away from the substrate 10 produce a discontinuity or poor contact connection at the undercut structure 40, thereby reducing or blocking lateral leakage. It is also beneficial to make the material cover the bottom of the groove more evenly, improving the uniformity of film thickness. This disclosure provides an optional embodiment in which the angle α between the sidewall 41 of the undercut structure 40 and the plane containing the substrate 10 is equal to 80°; another optional embodiment in which the angle α between the sidewall 41 of the undercut structure 40 and the plane containing the substrate 10 is equal to 70°; yet another optional embodiment in which the angle between the sidewall 41 of the undercut structure 40 and the plane containing the substrate 10 is 45°≤α≤75°; and yet another optional embodiment in which the angle between the sidewall 41 of the undercut structure 40 and the plane containing the substrate 10 is 60°≤α≤85°.

[0041] It should be noted that the figure shows two included angles α, which are the included angles between the sidewalls 41 on both sides of the undercut structure 40 and the plane where the substrate 10 is located.

[0042] Please continue to refer to this. Figure 3In one optional embodiment of this disclosure, on the plane where the substrate 10 is located, the orthographic projection between the two light-emitting units 20 includes only the orthographic projection of a sub-region 320 of a second sub-film layer 32. Specifically, along the first direction F1, the space between two adjacent light-emitting units 20 includes only a sub-region 320 of a second sub-film layer 32. The sub-region 320 cooperates with the first sub-film layer 31 to form an undercut structure 40 between the two light-emitting units 20. In this way, the film layer above the first sub-film layer 31 has a discontinuity or poor contact connection at the undercut structure 40, making it difficult for electrons and holes to be transmitted in the film layer (including the increase of transmission distance), thereby reducing or blocking lateral leakage, which is beneficial to improving the crosstalk phenomenon of the display panel 100, and thus improving the display effect of the display panel 100. Meanwhile, since only one sub-region 320 is set, it is beneficial to reduce the orthogonal projection area of ​​the second sub-film layer 32 on the plane of the substrate 10, improve the light transmittance of the display panel 100, and improve the accuracy of fingerprint recognition when the display panel 100 needs to implement the fingerprint recognition function.

[0043] Please continue to refer to this. Figure 3 In one optional embodiment of this disclosure, on the plane where the substrate 10 is located, the orthographic projections of the two light-emitting units 20 include the orthographic projections of the two undercut structures 40.

[0044] Specifically, in this embodiment, two undercut structures 40 are provided between two adjacent light-emitting units 20. Thus, the film layer on the side of the first sub-film layer 31 away from the substrate 10 covers the two undercut structures 40, which is more conducive to reducing or blocking lateral leakage between adjacent light-emitting units 20, further improving the crosstalk phenomenon of the display panel 100, and consequently improving the display effect of the display panel 100. It should be noted that this disclosure only uses two undercut structures 40 as an example. More than one undercut structure 40 can be provided between two light-emitting units 20, but this is not a limitation. Where the setting conditions permit, more than two undercut structures 40 can also be provided between two light-emitting units 20. For example, three undercut structures 40 can be provided between two light-emitting units 20. The specific embodiment is selected according to actual needs, and this disclosure does not impose specific limitations.

[0045] Figure 6 The diagram shown is a schematic representation of another film layer of the display panel provided in this embodiment. Please refer to... Figure 6 In another alternative embodiment of this disclosure, on the plane where the substrate 10 is located, the orthographic projection between the two light-emitting units 20 includes only the orthographic projection of the undercut structure 40.

[0046] Specifically, when at least two undercut structures 40 are included between two light-emitting units 20, a suspended trace (e.g., a suspended common transmission layer) will be generated between the undercut structures 40 and the film layer above the first sub-film layer 31. This suspended trace is disconnected from the film layers on both sides along the first direction F1 and may couple with other signal lines. Therefore, in this embodiment, only one undercut structure 40 is provided between two adjacent light-emitting units 20. This helps to avoid coupling of the suspended trace with other signal lines, reduces the impact on signal transmission, and thus helps to improve the performance of the display panel 100. In addition, reducing the number of undercut structures 40 between two light-emitting units 20 also helps to reduce the width of the sub-region 320 of the second sub-film layer 32 along the first direction F1, thereby helping to reduce the orthogonal projection area of ​​the second sub-film layer 32 on the plane of the substrate 10 and improve the light transmittance of the display panel 100.

[0047] When only one undercut structure 40 is included between the two light-emitting units 20, please refer to the following for the relative position of the undercut structure 40 and the sub-region 320 of the second sub-film layer 32. Figure 6 In one optional embodiment, the undercut structure 40 and the sub-region 320 of the second sub-film layer 32 partially overlap in a direction perpendicular to the plane of the substrate 10. Specifically, for the undercut structure 40, its orthographic projection on the plane of the substrate 10 partially overlaps with the orthographic projection of the sub-region 320 of the second sub-film layer 32 on the plane of the substrate 10, but not entirely; for the sub-region 320 of the second sub-film layer 32, its orthographic projection on the plane of the substrate 10 partially overlaps with the orthographic projection of the undercut structure 40 on the plane of the substrate 10, but not entirely. With this configuration, the bending degree of the undercut structure 40 is relatively small. When other film layers are deposited on the undercut structure 40, the deposited film layers are more easily deposited deep into the undercut structure 40. For example, when depositing the encapsulation layer 50, the material of the encapsulation layer 50 is more likely to fill the undercut structure 40, reducing voids in the encapsulation layer 50. This avoids or reduces lateral leakage while improving the reliability of the film layer. At the same time, the relatively small number of undercut structures 40 in this embodiment also helps to reduce voids in the film layer during deposition, thereby improving the reliability of the film layer.

[0048] It should be noted that, Figure 3 and Figure 6The illustrated embodiments show that each of two adjacent light-emitting units 20 along the first direction F1 includes a sub-region 320. One sub-region 320 may correspond to one undercut structure 40, or two undercut structures 40 may be provided, but this application is not limited thereto. For example, in some other embodiments, two sub-regions 320 may be provided between the two light-emitting units 20, with each sub-region 320 corresponding to one undercut structure 40. This disclosure does not specifically limit the number of sub-regions 320 between the light-emitting units 20, the number of undercut structures 40, or the number of undercut structures 40 corresponding to one sub-region 320; specific implementations can be selected according to actual conditions.

[0049] Figure 7 The diagram shown is a schematic representation of another planar structure of the display panel provided in an embodiment of this disclosure. Figure 8 The diagram shown is a schematic representation of another film layer of a display panel provided in this embodiment. Please refer to [the diagram]. Figure 7 and Figure 8 In one optional embodiment of this disclosure, a touch layer 60 is further included. The touch layer 60 is located on the side of the light-emitting unit 20 and the pixel definition layer 30 away from the substrate 10. The touch layer 60 includes metal traces 61. In a direction perpendicular to the plane of the substrate 10, the metal traces 61 at least partially overlap with the second sub-film layer 32.

[0050] It should be noted that, Figure 7 The image shows metal traces 61 extending in different directions in the touch layer 60, but does not represent the actual structure of the metal traces 61 in the touch layer 60. Figure 7 Neutron region 320 is for illustrative purposes only and does not represent the actual structure and number of sub-regions 320. For clarity, Figure 7 The fill of sub-region 320 in the middle is set with transparency.

[0051] Specifically, the side of the second electrode layer 203 away from the substrate 10 may also include an encapsulation layer 50 for isolating moisture and protecting the display panel 100. The specific structure and materials of the encapsulation layer 50 are not specifically limited in this disclosure. In some optional embodiments, the encapsulation layer 50 may include an inorganic layer and an organic layer. On the side of the encapsulation layer 50 away from the substrate 10, a touch layer 60 is also included. The orthographic projection of the metal traces 61 in the touch layer 60 onto the plane of the substrate 10 overlaps with the orthographic projection of the second sub-film layer 32 onto the plane of the substrate 10. Since the light transmittance of the metal traces 61 and the second sub-film layer 32 in the touch layer 60 is relatively poor, this arrangement helps to increase the overall light-transmitting area of ​​the display panel 100 and improve the light transmittance. When fingerprint recognition is required in the display panel 100, it improves the accuracy of fingerprint recognition. Optionally, the touch layer 60 is implemented using TPOT technology. It should be noted that TPOT (Touch Panel On TFE) technology places the touch layer 60 on top of the thin-film encapsulation layer 50. Compared to traditional touch display panels 100, in TPOT technology, the touch layer 60 and the display structure are stacked, which avoids mutual interference between touch and display, improving both display and touch performance. Furthermore, because the touch layer 60 and the display structure are not on the same layer, the traces in the touch layer 60 and the traces in the display structure are located in different film layers. For example, along the thickness direction of the display panel 100, the traces in the touch structure and the traces in the display structure can overlap, which is beneficial for achieving narrow bezels.

[0052] Please continue to refer to this. Figure 7 and Figure 8 In one optional embodiment of this disclosure, on the plane where the substrate 10 is located, the orthographic projection of the sub-region 320 of the second sub-film layer 32 is a rectangle, the rectangle including two opposing first sides; the first side is perpendicular to the first direction F1, the first direction F1 is the direction in which one of the two light-emitting units 20 adjacent to the sub-region 320 points to the other light-emitting unit 20, and the first direction F1 is parallel to the plane where the substrate 10 is located; on the plane where the substrate 10 is located, the two first sides of the orthographic projection of the sub-region 320 are respectively located on both sides of the orthographic projection of the metal trace 61.

[0053] Specifically, the second sub-film layer 32 includes multiple non-connected sub-regions 320, and the orthographic projection of each sub-region 320 onto the plane of the substrate 10 is rectangular. Please refer to... Figure 7From the shown perspective, a sub-region 320 overlaps with the corresponding metal trace 61. Along the extension direction of the sub-region 320 and the corresponding metal trace 61, the sub-region 320 and the metal trace 61 partially overlap, and the sub-region 320 does not completely cover the metal trace 61. This helps improve the light transmittance of the display panel 100, and improves the accuracy of fingerprint recognition when the display panel 100 needs to implement fingerprint recognition functionality. Along the width direction of the sub-region 320 and the corresponding metal trace 61, the sub-region 320 completely covers the metal trace 61. The edge of the orthographic projection of the metal trace 61 onto the plane of the substrate 10 lies within the orthographic projection of the sub-region 320 onto the plane of the substrate 10. This arrangement means that the sub-region 320, compared to the metal trace 61 in the touch layer 60, only occupies a small amount of space, which helps reduce the impact on light transmittance and thus facilitates the implementation of fingerprint recognition functionality. At the same time, sufficient space is reserved to form the undercut structure 40, which helps to reduce or block lateral leakage, thereby improving the crosstalk phenomenon of the display panel and improving the display effect of the display panel.

[0054] Figure 9 The diagram shown is a schematic representation of another planar structure of the display panel provided in an embodiment of this disclosure. Figure 10 The diagram shown is a schematic representation of another film layer of a display panel provided in this embodiment. Please refer to [the diagram]. Figures 7-10 Regarding the arrangement of the second sub-film layer 32 and the metal trace 61, in some optional embodiments of this disclosure, all the second sub-film layers 32 overlap with the metal trace 61 in the direction perpendicular to the plane of the substrate 10.

[0055] Specifically, there are two specific implementation methods, please refer to [link / reference]. Figure 7 and Figure 9 Firstly, each sub-region 320 in the second sub-film layer 32 overlaps with the metal trace 61. The opaque area generated by the sub-region 320 and the opaque area generated by the metal trace 61 at least partially overlap. This reduces the impact of the opaque film layer on the light transmittance of the display panel 100, which is beneficial for realizing the fingerprint recognition function. Please refer to... Figure 9 and Figure 10 Secondly, all areas in the second sub-film layer 32 overlap with the metal trace 61. In other words, the orthographic projection of the second sub-film layer 32 onto the plane of the substrate 10 lies within the orthographic projection of the metal trace 61 onto the plane of the substrate 10. This reduces or avoids increasing the opaque area, which helps to reduce the impact on light transmittance and further facilitates the realization of fingerprint recognition function and improves the accuracy of fingerprint recognition.

[0056] In this disclosure, the second sub-film layer 32 is made of a light-impermeable material. To reduce the impact on the light transmittance of the display panel 100, the width of the sub-region 320 of the second sub-film layer 32 can be set. Please refer to [reference needed]. Figure 8Optionally, in the first direction F1, the width W1 of the sub-region 320 of a second sub-film layer 32 is 4 micrometers to 6 micrometers (inclusive); the first direction F1 is the direction in which one of the two light-emitting units 20 adjacent to the sub-region 320 points to the other light-emitting unit 20, and the first direction F1 is parallel to the plane of the substrate 10.

[0057] Specifically, when the width W1 of a sub-region 320 of a second sub-film layer 32 is less than 4 micrometers, the width W1 of the sub-region 320 is too small, which is not conducive to forming the undercut structure 40; when the width W1 of a sub-region 320 of a second sub-film layer 32 is greater than 6 micrometers, the width W1 of the sub-region 320 is too large. Since the second sub-film layer 32 is a material with poor light transmittance, when the width W1 of the sub-region 320 is too large, it will have a significant impact on the light transmittance, which may lead to the inability to realize the fingerprint recognition function. Therefore, this disclosure sets the width W1 of the sub-region 320 of a second sub-film layer 32 along the first direction F1 to be 4μm≤W1≤6μm. In this way, it is beneficial for the second sub-film layer 32 and the first sub-film layer 31 to participate in the formation of the undercut structure 40, and it is also beneficial to reduce the impact on the light transmittance, thereby facilitating the realization of the fingerprint recognition function. This disclosure provides an optional embodiment in which the width W1 of a sub-region 320 along the first direction F1 is 4μm; another optional embodiment in which the width W1 of a sub-region 320 along the first direction F1 is 5μm; yet another optional embodiment in which the width W1 of a sub-region 320 along the first direction F1 is 6μm; and still another optional embodiment in which the width of a sub-region 320 along the first direction F1 is 4.5μm≤W1≤5.5μm.

[0058] It should be noted that the width W2 of the metal trace 61 along the first direction F1 in the touch layer 60 can be smaller than the width W1 of a sub-region 320 along the first direction F1. This is beneficial for setting the undercut structure 40 and for reducing the impact on light transmittance. This disclosure provides an optional embodiment where the width W2 of the metal trace 61 along the first direction F1 is 3μm; another optional embodiment where the width W2 of the metal trace 61 along the first direction F1 is 4μm; and yet another optional embodiment where the width W2 of the metal trace 61 along the first direction F1 is 2μm ≤ W2 ≤ 5μm. This disclosure is only used as an example and is not intended to limit the scope of the invention.

[0059] Based on the same inventive concept, this disclosure provides a display device. Figure 11 The diagram shown is a planar structural schematic of a display device provided in an embodiment of this disclosure. Please refer to it. Figure 11The display device 200 includes a display panel 100, which can be any of the display panels 100 provided in this disclosure.

[0060] It should be noted that the embodiments of the display device 200 provided in this application can refer to the embodiments of the display panel 100 described above, and will not be repeated here. The display device 200 provided in this application can be any product and component with display function, such as a mobile phone, tablet computer, television, touch screen, laptop computer, or navigator.

[0061] As can be seen from the above embodiments, the display module and display device provided by the present invention achieve at least the following beneficial effects:

[0062] As can be seen from the above embodiments, the display panel and display device provided by the present invention achieve at least the following beneficial effects:

[0063] This application provides a display panel and a display device. An undercut structure is provided in the display panel, wherein the undercut structure is composed of a first sub-film layer and a second sub-film layer in a pixel definition layer. By providing the undercut structure, this disclosure causes a break or poor contact connection at the undercut point in the film layer located on the side of the first sub-film layer away from the substrate. Therefore, electrons and holes are less likely to propagate within the film layer, thereby reducing or blocking lateral leakage and improving crosstalk in the display panel, thus enhancing the display effect. Furthermore, this disclosure also allows the second sub-film layer to be multiple non-adjacent sub-regions, rather than a single layer. This improves the light transmittance of the display panel and, when fingerprint recognition functionality is required, increases the accuracy of fingerprint recognition.

[0064] 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.

[0065] 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 by, The display panel comprises: a substrate; a plurality of light emitting units on one side of the substrate; a pixel definition layer on one side of the substrate, the pixel definition layer comprising a first sub-film layer and a second sub-film layer, the first sub-film layer being on the side of the second sub-film layer away from the substrate, the material of the first sub-film layer being different from that of the second sub-film layer, the second sub-film layer comprising a plurality of unconnected sub-areas; a plurality of undercut structures in the pixel definition layer, the first sub-film layer and the second sub-film layer participating in forming the undercut structures.

2. The display panel of claim 1, wherein, The light transmittance of the material of the second sub-film layer is less than that of the material of the first sub-film layer.

3. The display panel of claim 1, wherein, The angle between the sidewall of the undercut structure and the plane in which the substrate is located is less than 90°.

4. The display panel of claim 1, wherein, In the plane in which the substrate is located, the orthographic projection between two light emitting units only comprises the orthographic projection of the sub-area of the second sub-film layer.

5. The display panel of claim 4, wherein, In the plane in which the substrate is located, the orthographic projection between two light emitting units comprises the orthographic projection of two undercut structures.

6. The display panel of claim 4, wherein, In the plane in which the substrate is located, the orthographic projection between two light emitting units only comprises the orthographic projection of one undercut structure.

7. The display panel of claim 6, wherein, In the direction perpendicular to the plane in which the substrate is located, the undercut structure and the sub-area of the second sub-film layer only partially overlap, and the sub-area of the second sub-film layer and the undercut structure only partially overlap.

8. The display panel of claim 1, wherein, Further comprising a touch layer, the touch layer being on the side of the light emitting units and the pixel definition layer away from the substrate; The touch layer comprises metal traces; In the direction perpendicular to the plane in which the substrate is located, the metal traces and the second sub-film layer at least partially overlap.

9. The display panel of claim 8, wherein, In the plane in which the substrate is located, the orthographic projection of the sub-area of the second sub-film layer is a rectangle, and the rectangle comprises two opposite first edges; The first edge is perpendicular to a first direction, the first direction being the direction in which one light emitting unit points to another light emitting unit among the two light emitting units adjacent to the sub-area, and the first direction being parallel to the plane in which the substrate is located; In the plane in which the substrate is located, the two first edges of the orthographic projection of the sub-area are respectively located on the two sides of the orthographic projection of the metal traces.

10. The display panel of claim 8, wherein, In the direction perpendicular to the plane in which the substrate is located, all the second sub-film layers overlap the metal traces.

11. The display panel of claim 1, wherein, In the first direction, the width of the sub-area of one second sub-film layer is 4-6 microns; The first direction is the direction in which one light emitting unit points to another light emitting unit among the two light emitting units adjacent to the sub-area, and the first direction is parallel to the plane in which the substrate is located.

12. The display panel of claim 1, wherein, The light emitting unit comprises a series structure of at least two stacked charge generation layers.

13. A display device comprising: The display panel of any one of claims 1-12.

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