Display panel and display device

Abstract

The invention 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 the same, and the second sub-film layer comprises a plurality of sub-regions which are not connected; the undercut structure is located in the pixel definition layer, and the first sub-film layer and the second sub-film layer participate in forming the undercut structure. By arranging the undercut structure, the film layer on the side, away from the substrate, of the first sub-film layer generates a fault or is poor in contact connection effect at the undercut structure, transverse leakage flow can be reduced or blocked, the crosstalk phenomenon of the display panel is improved, and therefore the display effect of the display panel is improved. In addition, the second sub-film layer is not laid in the whole layer, the light transmittance of the display panel is improved, and when the fingerprint recognition function needs to be achieved in the display panel, the accuracy of fingerprint recognition is improved.

Description

Technical Field

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

[0002] With the continuous development of science and technology, more and more display products are widely used in people's daily lives and work, bringing great convenience to people's daily lives and work, and becoming an indispensable important tool for people today. In some display products, there are relatively serious crosstalk problems, resulting in poor display effects of the display products. Therefore, how to solve the above problems has become one of the technical problems to be solved urgently at present. Summary of the Invention

[0003] In order to solve the above technical problems, the present disclosure provides a display panel and a display device to improve the crosstalk problem of display products, thereby improving the display effect.

[0004] In a first aspect, the present disclosure provides a display panel, including:

[0005] A substrate;

[0006] A plurality of light-emitting units located on one side of the substrate;

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

[0008] A plurality of undercut structures located in the pixel definition layer, and the first sub-layer and the second sub-layer participate in forming the undercut structures.

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

[0010] The technical solutions provided by the embodiments of the present disclosure have the following advantages compared with the prior art:

[0011] The present disclosure provides a display panel and a display device. A bottom cut structure is provided in the display panel, and the bottom cut structure is formed by a first sub-film layer and a second sub-film layer in the pixel definition layer. By providing the bottom cut structure, the film layer on the side of the first sub-film layer away from the substrate has a fault or a poor contact connection at the bottom cut structure, so that electrons and holes are not easily transmitted in the film layer, thereby reducing or blocking the lateral leakage current, which is beneficial to improving the crosstalk phenomenon of the display panel and improving the display effect of the display panel. In addition, the present disclosure also provides that the second sub-film layer can be multiple non-adjacent sub-regions instead of being laid as a whole layer. In this way, it is beneficial to improve the light transmittance of the display panel, and when the fingerprint recognition function needs to be realized in the display panel, the accuracy of fingerprint recognition is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

[0015] Figure 2 Shown is a schematic plan view of a display panel provided by an embodiment of the present disclosure;

[0016] Figure 3 Shown is a schematic diagram of a film layer of a display panel provided by an embodiment of the present disclosure;

[0017] Figure 4 Shown is another schematic diagram of a film layer of a display panel provided by an embodiment of the present disclosure;

[0018] Figure 5 Shown is a schematic diagram of a partial film layer provided by an embodiment of the present disclosure;

[0019] Figure 6 Shown is another schematic diagram of a film layer of a display panel provided by an embodiment of the present disclosure;

[0020] Figure 7 Shown is another schematic plan view of a display panel provided by an embodiment of the present disclosure;

[0021] Figure 8 Shown is yet another schematic diagram of a film layer of a display panel provided by an embodiment of the present disclosure;

[0022] Figure 9 Shown is another schematic plan view of a display panel provided by an embodiment of the present disclosure;

[0023] Figure 10 Shown is another schematic view of a film layer of a display panel provided by an embodiment of the present disclosure;

[0024] Figure 11 Shown is a schematic plan view of a display device provided by an embodiment of the present disclosure. Detailed implementation manners

[0025] In order to more clearly understand the above objects, features and advantages of the embodiments of the present disclosure, the solutions of the embodiments of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.

[0026] In the following description, many specific details are set forth in order to fully understand 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 a part of the embodiments of the present disclosure, rather than all of the embodiments. The inventors have found in the research that in some display panels, including those with poor insulation performance and a film layer deposited in a whole layer, for example, the display panel includes series-connected light-emitting units, Figure 1 Shown is a schematic view of a film layer of a display panel in the prior art, please refer to Figure 1 , the light-emitting units 20' are connected through a connection layer, and the connection layer includes a negative charge generation layer NCGL' for generating electrons and a positive charge generation layer PCGL' for generating holes. In order to save manufacturing costs, the negative charge generation layer NCGL' and the positive charge generation layer NCGL' are usually formed by depositing a whole layer using a conventional metal mask (Common Metal Mask, CMM). However, due to the good conductivity of the materials of the negative charge generation layer NCGL' and the positive charge generation layer PCGL', serious lateral leakage current occurs, which in turn causes crosstalk between adjacent light-emitting units, resulting in deviations in the color or brightness of the light-emitting units and affecting the display effect. Especially for the low gray levels of display products, at low gray levels, the current of the light-emitting units is small. When the lateral leakage current is serious, it is more easily interfered, resulting in color deviation of the display panel and affecting the display effect of the display panel.

[0027] Therefore, how to solve the above problems has become one of the technical problems to be solved urgently at the present stage.

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

[0029] Figure 2 The following is a schematic plan view of a display panel provided by an embodiment of the present disclosure. Figure 3 The following is a schematic view of a film layer of a display panel provided by an embodiment of the present disclosure. Please refer to Figure 2 and Figure 3 , the present 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, and the light-emitting units 20 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 is 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 are not completely the same. The second sub-film layer 32 includes a plurality of non-connected sub-regions 320; a 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 only the display panel 100 with a rectangular structure is taken as an example for illustration, and the actual shape of the display panel 100 is not limited. In some other embodiments of the present disclosure, the display panel 100 may also be embodied in other feasible shapes such as a circle, a rounded rectangle, etc. Figure 2 The light-emitting units 20 in

[0031] are also only for illustration, and their number does not represent the actual number of light-emitting units 20 in the display panel 100. Specifically, the substrate 10 in the display panel 100 plays a supporting role for the film layers, devices, etc. thereon. The substrate 10 may be a rigid substrate or a flexible substrate. The substrate 10 further includes an array layer, and the array layer includes a plurality of pixel driving circuits, and each pixel driving circuit is used to drive the corresponding connected light-emitting unit 20 to emit light. Optionally, the display panel 100 provided in this embodiment may be a display panel 100 using organic light-emitting diode display technology, that is, an OLED (Organic Light-Emitting Diode) display panel. The connection relationship between the light-emitting unit 20 and the pixel driving unit can be appropriately referred to Figure 4 , Figure 4 The following is another schematic view of a film layer of a display panel provided by an embodiment of the present disclosure. Please refer to Figure 4, the pixel driving circuit includes a driving transistor T0, and the driving transistor T0 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, the holes generated by the first electrode 201 and the electrons generated by the second electrode layer 203 will combine in the light-emitting material layer 202 to generate bright 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 a plurality of pixel openings, and the light-emitting unit 20 is arranged in the pixel openings. The light-emitting unit 20 may include, but is not limited to, light-emitting units 20 of various different 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 in the present disclosure Figure 4 , only the second electrode layer 203 is shown for the film layer located above the first sub-film layer 31. The present disclosure only takes 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 fault or a poor contact connection effect, but is not limited thereto. Similarly, Figure 8 and Figure 10 only one film layer on the side of the undercut structure away from the substrate 10 is shown. There are other film layers above the undercut structure 40. Optionally, on the side of the undercut structure away from the substrate 10, there are also film layers such as a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer that are deposited by whole-layer evaporation. The present disclosure only takes this as an example for illustration and is not limited thereto.

[0033] It can be understood that for some film layers with poor insulation performance and deposited by whole-layer evaporation in the display panel 100, electrons and holes can be transported smoothly in the film layer, resulting in serious lateral leakage current in the film layer, and further causing crosstalk between adjacent light-emitting units 20, resulting in deviations in the color or brightness of the light-emitting units 20 and affecting the display effect. Exemplarily, please refer to FIG. Figure 3 , when the display panel 100 includes series-connected light-emitting units, a charge generation layer CGL for realizing the connection of 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 deposited by whole-layer evaporation and has good conductivity. Then, the lateral leakage current in the charge generation layer CGL is serious, and the crosstalk problem between adjacent light-emitting units 40 is serious.

[0034] Therefore, by providing the undercut structure 40, the display panel 100 provided by the embodiments of the present disclosure improves the crosstalk problem in the display panel 100. Specifically, the pixel definition layer 30 includes a first sub-film layer 31 and a second sub-film layer 32 which are stacked, and the second sub-film layer 32 is 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, the materials not being completely the same means that the first sub-film layer 31 and the second sub-film layer 32 can adopt the same type of material, but at least one property of the materials is different. Optionally, both the first sub-film layer 31 and the second sub-film layer 32 are organic films. Under the same process conditions, the etching rate of the second sub-film layer 32 is greater than that of the first sub-film layer 31, so that the first sub-film layer 31 and the second sub-film layer 32 together form the undercut structure 40. In an alternative embodiment of the present disclosure, when manufacturing the first sub-film layer 31 and the second sub-film layer 32, the manufacturing material (usually photoresist) is deposited in a whole layer first, and then etched by the Ashing process to pattern the deposited material. The Ashing process is a process of using 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 less than that of the second sub-film layer 32, and in cooperation with the corresponding mask pattern, the 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 setting of the undercut structure 40 in the present disclosure causes the film layers (such as the negative charge generation layer NCGL and the positive charge generation layer NCGL) on the side of the first sub-film layer 31 away from the substrate 10 to have a fault or a poor contact connection effect at the undercut structure 40. Therefore, electrons and holes are not easily transmitted in the film layer, thereby reducing or blocking the lateral leakage current, which is beneficial to improving the crosstalk phenomenon of the display panel 100 and improving the display effect of the display panel 100. In addition, the present disclosure also provides that the second sub-film layer 32 can be multiple non-adjacent sub-regions 320, rather than being laid in a whole layer. In this way, it is beneficial to improve the light transmittance of the display panel 100, and when the fingerprint recognition function needs to be realized in the display panel 100, the accuracy of fingerprint recognition is improved.

[0036] Further, please refer to Figure 3, in order to improve the brightness, lifespan, and efficiency of the display panel 100, in an alternative embodiment of the present disclosure, the light-emitting unit 20 includes a series structure of at least two stacked charge generation layers CGL. Specifically, the light-emitting units 20 are connected through a series structure to form a series-type light-emitting unit 20. The charge generation layer CGL includes a negative charge generation layer NCGL for generating electrons and a positive charge generation layer PCGL for generating holes. The negative charge generation layer NCGL and the positive charge generation layer NCGL are located above the undercut structure 40. To save manufacturing costs, the negative charge generation layer NCGL and the positive charge generation layer NCGL are typically formed by whole-layer evaporation using a common metal mask (CMM). However, due to the good electrical conductivity of the materials of the negative charge generation layer NCGL and the positive charge generation layer PCGL, serious lateral leakage current occurs, which in turn causes crosstalk between adjacent light-emitting units 20, resulting in deviations in the color or brightness of the light-emitting unit 20 and affecting the display effect. Especially for the low gray levels of display products, at low gray levels, the current of the light-emitting unit 20 is small. When the lateral leakage current is serious, it is more easily interfered, resulting in color deviation of the display panel 100 and affecting the display effect of the display panel 100. Therefore, in this application, by providing the undercut structure 40, the negative charge generation layer NCGL and the positive charge generation layer NCGL generate a fault or a poor contact connection at the undercut structure 40, so that electrons and holes are not easily transmitted in the film layer, reducing or blocking the lateral leakage current, which is beneficial to improving the crosstalk phenomenon of the display panel 100 and improving the display effect of the display panel 100.

[0037] Optionally, the undercut structure 40 is located between different light-emitting units 20, and the series-type light-emitting units 20 do not include the undercut structure 40. In this way, it is beneficial to reduce or avoid the lateral leakage current between different light-emitting units 20, improve the crosstalk between the light-emitting units 20, and at the same time avoid the disconnection of the series-type light-emitting units 20 and prevent the series-type light-emitting units 20 from turning into individual light-emitting units 20.

[0038] Please refer to Figure 3 , in an alternative embodiment of the present disclosure, the light transmittance of the material of the second sub-film layer 32 is less than the light transmittance of the material of the first sub-film layer 31. That is to say, compared with the first sub-film layer 31, the second sub-film layer 32 has a higher light absorption rate, and the amount of light that can penetrate the second sub-film layer 32 is less than the amount of light that can penetrate the first sub-film layer 31. Optionally, the first sub-film layer 31 is made of a transparent or nearly transparent material, and the second sub-film layer 32 is made of a black material. As Figure 3As shown, the second sub-film layer 32 is located between adjacent light-emitting units 20 along the first direction F1. The light transmittance of the material of the second sub-film layer 32 is relatively low. In this way, it is beneficial to prevent the light between different light-emitting units 20 from interfering with each other, improve the crosstalk problem of the display panel 100, and thus is beneficial to improving the display effect of the display panel 100.

[0039] Figure 5 The following is a schematic diagram of a partial film layer provided by an embodiment of the present disclosure. Please refer to Figure 3 and Figure 5 , the undercut structure 40 of the present disclosure is a structure similar to a groove. The undercut structure 40 has a side wall 41. Optionally, the included angle α between the side wall 41 of the undercut structure 40 and the plane where the substrate 10 is located is less than 90°.

[0040] Specifically, when the included angle α between the side wall 41 of the undercut structure 40 and the plane where the substrate 10 is located is greater than or equal to 90°, the opening of the undercut structure 40 is small. During the subsequent process of fabricating the film layer, a shadow effect occurs, resulting in uneven material deposition. When the included angle α between the side wall 41 of the undercut structure 40 and the plane where the substrate 10 is located is less than 90°, it is beneficial to cause a fault or a poor contact connection effect of the film layer on the side of the first sub-film layer 31 away from the substrate 10 at the undercut structure 40, thereby reducing or blocking the lateral leakage current, and also beneficial to the material covering the bottom of the groove more evenly, improving the film layer thickness uniformity. An optional implementation provided by the present disclosure is that the included angle α between the side wall 41 of the undercut structure 40 and the plane where the substrate 10 is located is equal to 80°. Another optional implementation provided by the present disclosure is that the included angle α between the side wall 41 of the undercut structure 40 and the plane where the substrate 10 is located is equal to 70°. Another optional implementation provided by the present disclosure is that the included angle α between the side wall 41 of the undercut structure 40 and the plane where the substrate 10 is located satisfies 45° ≤ α ≤ 75°. Another optional implementation provided by the present disclosure is that the included angle α between the side wall 41 of the undercut structure 40 and the plane where the substrate 10 is located satisfies 60° ≤ α ≤ 85°.

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

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

[0043] Please continue to refer to Figure 3 , in an alternative embodiment of the present disclosure, on the plane where the substrate 10 is located, the orthographic projection between the two light-emitting units 20 includes the orthographic projection of two undercut structures 40.

[0044] Specifically, in this embodiment, two undercut structures 40 are provided between two adjacent light-emitting units 20. In this way, 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 beneficial to reducing or blocking the lateral leakage current between adjacent light-emitting units 20, further beneficial to improving the crosstalk phenomenon of the display panel 100, and thus beneficial to improving the display effect of the display panel 100. It should be noted that the present disclosure only takes two undercut structures 40 as an example. More than one undercut structure 40 can be provided between two light-emitting units 20, but it is not limited thereto. Under the condition that 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 are provided between two light-emitting units 20. The specific embodiments are selected according to actual needs, and the present disclosure does not make specific limitations.

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

[0046] Specifically, when there are at least two undercut structures 40 between two light-emitting units 20, between the undercut structures 40, there will also be a suspended trace (such as a suspended common transmission layer) in 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 be coupled with other signal lines. Therefore, in this embodiment, only one undercut structure 40 is provided between two adjacent light-emitting units 20. In this way, it is beneficial to avoid the coupling between the suspended trace and other signal lines, reduce the influence on signal transmission, and thus improve the performance of the display panel 100. In addition, reducing the number of undercut structures 40 between two light-emitting units 20 is also beneficial to reducing the width of the sub-region 320 of the second sub-film layer 32 along the first direction F1, and thus beneficial to reducing the orthographic projection area of the second sub-film layer 32 on the plane where the substrate 10 is located, and improving the light transmittance of the display panel 100.

[0047] When there is only one undercut structure 40 between two light-emitting units 20, for the relative position of the undercut structure 40 and the sub-region 320 of the second sub-film layer 32, please continue to refer to Figure 6 An optional embodiment provided by the present disclosure is that, in the direction perpendicular to the plane where the substrate 10 is located, the undercut structure 40 and the sub-region 320 of the second sub-film layer 32 only partially overlap, and the sub-region 320 of the second sub-film layer 32 and the undercut structure 40 only partially overlap. Specifically, for the undercut structure 40, the orthographic projection of the undercut structure 40 on the plane where the substrate 10 is located partially overlaps and partially does not overlap with the orthographic projection of the sub-region 320 of the second sub-film layer 32 on the plane where the substrate 10 is located; for the sub-region 320 of the second sub-film layer 32, the orthographic projection of the sub-region 320 on the plane where the substrate 10 is located partially overlaps and partially does not overlap with the orthographic projection of the undercut structure 40 on the plane where the substrate 10 is located. With such a setting, the bending degree of the undercut structure 40 is relatively small. When depositing other film layers on the undercut structure 40, the deposited film layer is more likely to be 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 41, reducing the voids in the encapsulation layer 50, while avoiding or reducing lateral leakage current and improving the reliability of the film layer. At the same time, the small number of undercut structures 40 in this embodiment is also beneficial to reducing the voids in the film layer when depositing the film layer, and thus beneficial to improving the reliability of the film layer.

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

[0049] Figure 7 Shown is another schematic plan view of a display panel provided by an embodiment of the present disclosure. Figure 8 Shown is another schematic diagram of a film layer of a display panel provided by an embodiment of the present disclosure. Please refer to Figure 7 and Figure 8 , in an alternative embodiment of the present disclosure, a touch control layer 60 is further included. The touch control layer 60 is located on the side of the light-emitting units 20 and the pixel definition layer 30 away from the substrate 10; the touch control 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 shows the metal traces 61 extending in different directions in the touch control layer 60, but does not represent the actual structure of the metal traces 61 in the touch control layer 60. Figure 7 The sub-region 320 in Figure 7 is also only for illustration and does not represent the actual structure and number of the sub-region 320. For clear illustration,

[0051] Specifically, on the side of the second electrode layer 203 away from the substrate 10, there may further be an encapsulation layer 50 for isolating moisture and protecting the display panel 100. The specific structure and material of the encapsulation layer 50 are not specifically limited in this disclosure. In some alternative 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, there is further a touch control layer 60. The positive projection of the metal trace 61 in the touch control layer 60 on the plane where the substrate 10 is located overlaps with the positive projection of the second sub-film layer 32 on the plane where the substrate 10 is located. Since the light transmittance of the metal trace 61 in the touch control layer 60 and the second sub-film layer 32 is poor, such an arrangement is beneficial to increasing the overall light-transmitting area of the display panel 100, improving the light transmittance, and when a fingerprint recognition function needs to be implemented in the display panel 100, improving the accuracy of fingerprint recognition. Optionally, the touch control layer 60 is implemented by TPOT technology. It should be noted that the TPOT (Touch Panel On TFE, touch surface on the thin-film encapsulation layer 50) technology is to make the touch control layer 60 on the thin-film encapsulation layer 50. Compared with the traditional touch display panel 100, in the TPOT technology, the touch control layer 60 and the display structure are stacked, which can avoid the mutual influence between touch and display, and improve the display effect and the touch effect. Further, since the touch control layer 60 and the display structure are not on the same layer, the traces in the touch control layer 60 and the traces in the display structure are respectively arranged in different film layers. For example, along the thickness direction of the display panel 100, the traces in the touch control structure and the traces in the display structure can overlap, which is beneficial to realizing a narrow border.

[0052] Please continue to refer to Figure 7 and Figure 8 , in an alternative embodiment of the present disclosure, on the plane where the substrate 10 is located, the positive projection of the sub-region 320 of the second sub-film layer 32 is a rectangle, and the rectangle includes two opposite first sides; the first sides are perpendicular to the first direction F1, and the first direction F1 is the direction in which one light-emitting unit 20 points to another light-emitting unit 20 among the two adjacent light-emitting units 20 to the sub-region 320. 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 positive projection of the sub-region 320 are respectively located on both sides of the positive projection of the metal trace 61.

[0053] Specifically, the second sub-film layer 32 includes a plurality of non-connected sub-regions 320, and the positive projection of the sub-region 320 on the plane where the substrate 10 is located is a rectangle. Please refer to, for example Figure 7As shown in the perspective view, a sub-region 320 overlaps with the corresponding metal trace 61. Along the extending direction of the sub-region 320 and the corresponding metal trace 61, the sub-region 320 partially overlaps with the metal trace 61, and the sub-region 320 does not completely cover the metal trace 61. In this way, it is beneficial to improve the light transmittance of the display panel 100. When the fingerprint recognition function needs to be implemented in the display panel 100, the accuracy of fingerprint recognition can be improved. 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 on the plane where the substrate 10 is located is located within the orthographic projection of the sub-region 320 on the plane where the substrate 10 is located. With such a setting, the setting of the sub-region 320 only occupies a small amount of additional space relative to the metal trace 61 in the touch layer 60, which is beneficial to reducing the impact on the light transmittance and thus beneficial to implementing the fingerprint recognition function. At the same time, sufficient space is reserved for forming the undercut structure 40, which is beneficial to reducing or blocking the lateral leakage current, thereby improving the crosstalk phenomenon of the display panel and improving the display effect of the display panel.

[0054] Figure 9 Shown is another schematic plan view of a display panel provided by an embodiment of the present disclosure. Figure 10 Shown is another schematic film layer view of a display panel provided by an embodiment of the present disclosure. Please refer to Figures 7 - 10 , for the setting manner of the second sub-film layer 32 and the metal trace 61, in some alternative embodiments of the present disclosure, in the direction perpendicular to the plane where the substrate 10 is located, all the second sub-film layers 32 overlap with the metal trace 61.

[0055] Specifically, it includes two specific implementation manners. Please refer to Figure 7 and Figure 9 . One is that each sub-region 320 in the second sub-film layer 32 overlaps with the metal trace 61, and the light-blocking area generated by setting the sub-region 320 and the light-blocking area generated by setting the metal trace 61 at least partially overlap. In this way, the impact on the light transmittance of the display panel 100 due to setting the light-blocking film layer is reduced, which is beneficial to implementing the fingerprint recognition function. Please refer to Figure 9 and Figure 10 . The other is that all regions in the second sub-film layer 32 overlap with the metal trace 61. That is to say, the orthographic projection of the second sub-film layer 32 on the plane where the substrate 10 is located is located within the orthographic projection of the metal trace 61 on the plane where the substrate 10 is located. In this way, the addition of light-blocking regions is reduced or avoided, which is beneficial to reducing the impact on the light transmittance and further beneficial to implementing the fingerprint recognition function and improving the accuracy of fingerprint recognition.

[0056] In the present disclosure, the second sub-film layer 32 is made of a material that is not easily transmissive to light. In order 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 Figure 8, optionally, in the first direction F1, the width W1 of a sub-region 320 of a second sub-film layer 32 is 4 to 6 micrometers (including 4 micrometers and 6 micrometers); the first direction F1 is the direction in which one light-emitting unit 20 points to another light-emitting unit 20 among two adjacent light-emitting units 20 of the sub-region 320, and the first direction F1 is parallel to the plane where the substrate 10 is located.

[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, the influence on the light transmittance is relatively large, which may cause the fingerprint recognition function to be unable to be realized. Therefore, in the present disclosure, the width W1 of the sub-region 320 of the second sub-film layer 32 along the first direction F1 is set to 4μm ≤ W1 ≤ 6μm. In this way, it is both conducive to the second sub-film layer 32 and the first sub-film layer 31 to participate in forming the undercut structure 40, and conducive to reducing the influence on the light transmittance, thereby facilitating the realization of the fingerprint recognition function. An optional implementation provided by the present disclosure is that the width W1 of a sub-region 320 along the first direction F1 = 4μm; another optional implementation provided by the present disclosure is that the width W1 of a sub-region 320 along the first direction F1 = 5μm; still another optional implementation provided by the present disclosure is that the width W1 of a sub-region 320 along the first direction F1 = 6μm; yet another optional implementation provided by the present disclosure is that the width 4.5μm ≤ W1 ≤ 5.5μm of a sub-region 320 along the first direction F1.

[0058] It should be noted that the width W2 of the metal trace 61 in the touch layer 60 along the first direction F1 can be less than the width W1 of a sub-region 320 along the first direction F1. In this way, on the one hand, it is conducive to setting the undercut structure 40, and on the other hand, it is conducive to reducing the influence on the light transmittance. An optional implementation provided by the present disclosure is that the width W2 of the metal trace 61 along the first direction F1 = 3μm; another optional implementation provided by the present disclosure is that the width W2 of the metal trace 61 along the first direction F1 = 4μm; yet another optional implementation provided by the present disclosure is that the width 2μm ≤ W2 ≤ 5μm of the metal trace 61 along the first direction F1. The present disclosure only takes this as an example for illustration and is not limited thereto.

[0059] Based on the same inventive concept, the present disclosure provides a display device Figure 11 Shown is a schematic plan view of a display device provided by an embodiment of the present disclosure. Please refer to Figure 11, the display device 200 includes a display panel 100, and the display panel 100 is any one of the display panels 100 provided by the present disclosure.

[0060] It should be noted that for the embodiments of the display device 200 provided in the embodiments of the present application, reference may be made to the embodiments of the above-mentioned display panel 100, and repeated descriptions will not be elaborated. The display device 200 provided by the present application may be: a mobile phone, a tablet computer, a television, a touch controller, a notebook computer, a navigator, or any other product and component with a display function.

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

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

[0063] The present application provides a display panel and a display device. A bottom cut structure is provided in the display panel, and the bottom cut structure is formed by a first sub-film layer and a second sub-film layer in the pixel definition layer. By providing the bottom cut structure in the present disclosure, the film layer on the side of the first sub-film layer away from the substrate has a fault or a poor contact connection effect at the bottom cut structure, so electrons and holes are not easily transmitted in the film layer, thereby reducing or blocking the lateral leakage current, which is beneficial to improving the crosstalk phenomenon of the display panel and improving the display effect of the display panel. In addition, the present disclosure also provides that the second sub-film layer may be multiple non-adjacent sub-regions, rather than being laid as a whole layer. In this way, it is beneficial to improve the light transmittance of the display panel, and when a fingerprint recognition function needs to be implemented in the display panel, the accuracy of fingerprint recognition is improved.

[0064] 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 actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the above element.

[0065] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can 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 these embodiments described above, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized in that: include: substrate; A plurality of light-emitting units are located on one side of the substrate; a pixel definition layer, located 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 located on a side of the second sub-film layer away from the substrate, the first sub-film layer and the second sub-film layer being made of different materials, and the second sub-film layer comprising a plurality of unconnected sub-regions; A plurality of undercut structures are located in the pixel definition layer, and the first sub-membrane layer and the second sub-membrane layer participate in forming the undercut structures.

2. The display panel according to claim 1, characterized in that: The light transmittance of the material of the second sub-film layer is lower than the light transmittance of the material of the first sub-film layer.

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

4. The display panel according to claim 1, characterized in that: On the plane where the substrate is located, the orthographic projections of the two light-emitting units only include the orthographic projection of one sub-region of the second sub-film layer.

5. The display panel according to claim 4, characterized in that: On the plane where the substrate is located, orthographic projections of two of the light-emitting units include orthographic projections of two of the undercut structures.

6. The display panel according to claim 4, characterized in that: On the plane where the substrate is located, only one orthographic projection of the undercut structure is included between orthographic projections of two of the light-emitting units.

7. The display panel according to claim 6, characterized in that: In a direction perpendicular to the plane where the substrate is located, the undercut structure and the sub-region of the second sub-film layer only partially overlap, and the sub-region of the second sub-film layer and the undercut structure only partially overlap.

8. The display panel according to claim 1, characterized in that: It also includes a touch layer, which is located on a side of the light-emitting unit and the pixel definition layer away from the substrate; The touch layer includes metal wiring; In a direction perpendicular to the plane where the substrate is located, the metal wiring at least partially overlaps with the second sub-film layer.

9. The display panel according to claim 8, characterized in that: On the plane where the substrate is located, the orthographic projection of the sub-region of the second sub-film layer is a rectangle, and the rectangle includes two opposite first sides; The first side is perpendicular to a first direction, the first direction is a direction in which one light-emitting unit points to another light-emitting unit of two light-emitting units adjacent to the sub-region, and the first direction is parallel to the plane where the substrate is located; On the plane where the substrate is located, the two first sides of the orthographic projection of the sub-region are respectively located on both sides of the orthographic projection of the metal trace.

10. The display panel according to claim 8, characterized in that: In a direction perpendicular to the plane where the substrate is located, all of the second sub-film layers overlap with the metal wiring.

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

12. 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.

13. A display device, characterized in that: A display panel comprising any one of claims 1-12.

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