Display panel and display device
By introducing a dual light-shielding design of a black pixel delimiter layer and a planarization layer into the COE panel, the color separation phenomenon is solved, and the display effect of the high PPI design is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2022-12-26
- Publication Date
- 2026-07-21
Smart Images
Figure CN115835712B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of display technology, and in particular to a display panel and display device. Background Technology
[0002] For display panels, polarizer-less (POL-Less) technology refers to the technology of replacing the traditional polarizer in the display panel with a color filter or color film. It has advantages such as improving the light transmittance of the display panel, reducing the power consumption of the display panel, and making the display panel thinner.
[0003] Currently, common POL-Less technologies include color-on-encapsulation (COE) technology, which integrates color filters (CFs) into the encapsulation layer. Display panels using COE technology can be called COE panels. A COE panel generally includes a substrate, and on one side of the substrate, a pixel circuit layer, a pixel delimiter layer, an encapsulation layer, and a black matrix layer stacked sequentially. The pixel delimiter layer separates the light-emitting elements of different colors. The black matrix layer separates the CFs corresponding to the different colored light-emitting elements. The pixel circuit layer drives the light-emitting elements to emit light, and the light emitted by the light-emitting elements is filtered by the color CFs before being emitted, thus enabling the COE panel to display a color image.
[0004] However, research has found that external light (such as ambient light) is easily reflected on current COE panels, causing messy color separation and affecting the display effect of COE panels. Summary of the Invention
[0005] A display panel and display device are provided, which can solve the problem in related technologies where messy color separation easily occurs in COE panels, thus affecting the display effect of COE panels. The technical solution is as follows:
[0006] On one hand, a display panel is provided, the display panel comprising:
[0007] Substrate;
[0008] Located on one side of the substrate and stacked sequentially in a direction away from the substrate, are a pixel circuit layer, a planarization layer, a black pixel defining layer, an encapsulation layer, and a black matrix layer. The black pixel defining layer has multiple first openings, and the black matrix layer has multiple second openings. The multiple first openings and the multiple second openings are arranged at intervals in a direction parallel to the bearing surface of the substrate and correspond one-to-one.
[0009] Light-emitting elements located in each of the first openings;
[0010] In addition, a filter layer is located in each of the second openings, and the color of the filter layer in each of the second openings is the same as the color of the light-emitting element in the corresponding first opening;
[0011] The light transmittance of the planarization layer is not greater than that of the black pixel delimiting layer.
[0012] Optionally, the planarization layer is a black planarization layer.
[0013] Optionally, the material of the black planarization layer is the same as the material of the black pixel delimiting layer.
[0014] Optionally, the materials of the black planarization layer and the black pixel defining layer both include carbon black additives.
[0015] Optionally, the optical density value of the planarization layer is greater than or equal to the optical density threshold, and the optical density threshold is greater than the optical density value of the black pixel delimiting layer.
[0016] Optionally, the optical density threshold is 3.
[0017] Optionally, the material of the planarization layer includes at least one of organic and inorganic materials, wherein the organic material is doped with light-absorbing pigments.
[0018] Optionally, the inorganic material includes molybdenum oxide or aluminum oxide.
[0019] Optionally, the organic material includes polyimide or acrylic.
[0020] Optionally, the planarization layer comprises: multiple planarization film layers sequentially stacked in a direction away from the substrate;
[0021] Among the multilayer planar film layers, the light transmittance of at least one planar film layer is not greater than the light transmittance of the black pixel defining layer.
[0022] Optionally, the at least one flat film layer includes: a flat film layer close to the black pixel defining layer among the multilayer flat film layers.
[0023] Optionally, the thickness of the planarization layer is greater than the thickness of the black pixel defining layer, and the thickness direction is perpendicular to the bearing surface of the substrate.
[0024] Optionally, the filter layer includes a color filter.
[0025] Optionally, the pixel circuit layer includes: an active layer, a gate metal layer, and a source / drain metal layer sequentially stacked along a direction away from the substrate; the display panel further includes:
[0026] A first insulating layer is located between the active layer and the gate metal layer;
[0027] A second insulating layer is located between the gate metal layer and the source / drain metal layer;
[0028] A buffer layer located between the substrate and the pixel circuit layer;
[0029] And a protective layer located on the side of the black matrix layer away from the substrate.
[0030] On the other hand, a display device is provided, the display device comprising: a driving circuit, and a display panel as described above;
[0031] The driving circuit is electrically connected to the display panel and is used to drive the display panel to emit light.
[0032] In summary, the beneficial effects of the technical solutions provided by the embodiments of this disclosure can at least include:
[0033] A display panel and display device are provided. The display panel includes a substrate, and a pixel circuit layer, a planarization layer, a black pixel definition layer, an encapsulation layer, and a black matrix layer stacked along a direction away from the substrate. The black pixel definition layer has a plurality of spaced-apart first openings for arranging light-emitting elements. The black matrix layer has a plurality of spaced-apart second openings for arranging a light filter layer. The pixel circuit layer drives the light-emitting elements to emit light, and the light emitted by the light-emitting elements is filtered by the light filter layer before being emitted, enabling the display panel to display an image. Thus, this display panel is a COE panel that does not require a polarizer. Because the transmittance of the planarization layer is no greater than that of the black pixel definition layer, a dual light-shielding effect can be achieved through the black pixel definition layer and the planarization layer, preventing external light from incident on the display panel and causing reflection, improving color separation, and ensuring better display performance. Attached Figure Description
[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of this disclosure;
[0036] Figure 2 yes Figure 1 The diagram shows the ramp area of the black pixel boundary layer in the display panel.
[0037] Figure 3This is a schematic diagram of another display panel structure provided in an embodiment of this disclosure;
[0038] Figure 4 This is a schematic diagram of the structure of another display panel provided in this embodiment;
[0039] Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of this disclosure. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.
[0041] As described in the background section, while COE panels offer advantages such as low power consumption, high color gamut, and strong controllability, they are prone to color separation, especially noticeable when displaying dark images. Several factors contribute to this color separation. For example, the black matrix layer in current COE panels contains patterned pixel apertures. These apertures easily cause pinhole diffraction. Furthermore, when ambient light enters the COE panel through these apertures, it produces irregular reflections. These reflections then exit through the apertures, resulting in chaotic color separation. Current attempts to increase the anode area of the light-emitting elements in COE panels to block the emission of stray light are unsustainable, as this approach is detrimental to high PPI (Pixels Per Inch) designs.
[0042] This disclosure provides a display panel that can effectively block reflected light and improve color separation without affecting the high PPI design of the display panel.
[0043] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of this disclosure. Figure 1 As shown, the display panel includes:
[0044] The substrate 01 comprises a pixel circuit layer 02, a planarization (PLN) layer 03, a black pixel definition layer (BPDL) layer 04, an encapsulation layer 05, and a black matrix layer (BM) 06, which are sequentially stacked on one side of the substrate 01 and in a direction away from the substrate 01. The encapsulation layer 05 can be a thin film encapsulation (TFE) layer, meaning it can employ thin-film encapsulation. The black matrix layer 06 can also be referred to as the black matrix layer.
[0045] The black pixel defining layer 04 has multiple first openings K1, and the black matrix layer 06 has multiple second openings K2. The multiple first openings K1 and the multiple second openings K2 are arranged at intervals along the direction X1 parallel to the bearing surface of the substrate 01, and correspond one to one.
[0046] Based on this, continue to refer to Figure 1 As can be seen, the display panel also includes: light-emitting elements L1 located in each first opening K1, and a filter layer 07 located in each second opening K2. That is, the light-emitting elements L1 located in different first openings K1 can be separated by a black pixel defining layer 04, and the filter layer 07 located in different second openings K2 can be separated by a black matrix layer 06.
[0047] In each second opening K2, the color of the filter layer 07 is the same as the color of the light-emitting element L1 in the corresponding first opening K1. For example, if the light-emitting element L1 in a certain first opening K1 is a red light-emitting element L1, then the filter layer 07 in the second opening K2 corresponding to that first opening K1 can also be red.
[0048] Furthermore, optionally, in this embodiment, the colors of the light-emitting elements L1 located in adjacent first openings K1 can be different, and correspondingly, the colors of the filter layers 07 located in adjacent second openings K2 can also be different. Here, the color of the light-emitting element L1 can refer to the color of the light emitted by the light-emitting element L1. For example, the display panel may include multiple red light-emitting elements, multiple green light-emitting elements, and multiple blue light-emitting elements, for a total of three colors of light-emitting elements. In each of the three adjacent first openings K1, red light-emitting elements, green light-emitting elements, and blue light-emitting elements can be arranged sequentially. Of course, in some other embodiments, the colors of the light-emitting elements L1 located in adjacent first openings K1 can also be the same. This embodiment does not limit the arrangement of the multiple light-emitting elements L1.
[0049] Furthermore, in this embodiment, the pixel circuit formed by the pixel circuit layer 02 can be electrically connected to the light-emitting element L1 through a via penetrating the planarization layer 03, and is used to drive the light-emitting element L1 to emit light. For example, if the light-emitting element L1 is an organic light-emitting diode (OLED), the pixel circuit can transmit a driving current to the light-emitting element L1, thereby driving the light-emitting element L1 to emit light. The light emitted by the light-emitting element L1 can be filtered by the filter layer 07 before being emitted, so that the display panel can display an image. Since there is no need to set a polarizer, the display panel can be the COE panel described in the above embodiment.
[0050] It should be noted that the pixel circuit layer 02 used to form the pixel circuit generally includes a metallic material. Accordingly, the reflected light described in the above embodiments can refer to the light that is reflected by the metal in the pixel circuit layer 02 included in the display panel after external light is incident on the display panel.
[0051] In this embodiment of the disclosure, the light transmittance of the planarization layer 03 included in the display panel is not greater than (i.e., less than or equal to) the light transmittance of the black pixel defining layer 04.
[0052] The black pixel defining layer 04, due to its black color, has a light-blocking effect; typically, out of 1000 nits of incident light, only 100 nits can pass through it. Therefore, by setting the transmittance of the planarization layer 03 to be less than or equal to the transmittance of the black pixel defining layer 04, the planarization layer 03 can also have a light-blocking effect like the black pixel defining layer 04. In other words, this embodiment of the present disclosure achieves dual blocking of incident light through the combination of the black pixel defining layer 04 and the planarization layer 03. Furthermore, it can reduce the reflection of external light by the metal in the pixel circuit layer 02, improve color separation in the display panel, and ensure better display performance.
[0053] Furthermore, because the black pixel defining layer 04 has a first opening K1, the black pixel defining layer 04 has such... Figure 2 The diagram shows a relatively long sloping area with high light transmittance, meaning this sloping area affects the light-blocking performance of the black pixel defining layer 04. Furthermore, while the black pixel defining layer 04 has a light-blocking effect, due to its material properties, it still has strong transmittance in the red light band of the visible spectrum, failing to effectively absorb visible light across the entire wavelength range from 380 nm to 780 nm, thus unable to effectively block all visible light wavelengths. In this embodiment, by providing a flattening layer 03 that has a light-blocking effect similar to the black pixel defining layer 04, on the one hand, as described in the above embodiments, dual light blocking can be achieved; on the other hand, the problem of the high transmittance of the sloping area of the black pixel defining layer 04 failing to effectively block light, and the problem of the black pixel defining layer 04 failing to effectively block all visible light wavelengths, can be solved. This ensures reliable light blocking, thereby better improving the color separation phenomenon of the display panel and ensuring a better display effect.
[0054] In summary, this disclosure provides a display panel. The display panel includes a substrate, and a pixel circuit layer, a planarization layer, a black pixel definition layer, an encapsulation layer, and a black matrix layer stacked along a direction away from the substrate. The black pixel definition layer has a plurality of spaced-apart first openings for arranging light-emitting elements. The black matrix layer has a plurality of spaced-apart second openings for arranging a light filter layer. The pixel circuit layer drives the light-emitting elements to emit light, and the light emitted by the light-emitting elements is filtered by the light filter layer before being emitted, enabling the display panel to display an image. Thus, this display panel is a COE panel that does not require a polarizer. Because the transmittance of the planarization layer is no greater than that of the black pixel definition layer, a dual light-shielding effect can be achieved through the black pixel definition layer and the planarization layer, preventing external light from incident on the display panel and causing reflection, improving color separation of the display panel, and ensuring better display performance.
[0055] Optionally, as an alternative implementation, similar to the black pixel defining layer 04, the planarization layer 03 described in this embodiment can be a black planarization layer (BPLN). That is, this embodiment can achieve effective light blocking by combining BPDL and BPLN, resulting in a better light-blocking effect, thereby reducing the reflection of incident light by the metal in the pixel circuit layer 02 and effectively improving the color separation phenomenon of the display panel.
[0056] Optionally, based on the fact that the flattening layer 03 is a black flattening layer BPLN, the material of the black flattening layer 03 can be the same as the material of the black pixel delimiting layer 04.
[0057] For example, the materials of both the black planarization layer 03 and the black pixel defining layer 04 may include carbon black additives. Based on this embodiment, the light transmittance of the planarization layer 03 can be considered equal to the light transmittance of the black pixel defining layer 04.
[0058] Of course, combined Figure 2 Since the flat layer 03 does not have the long ramp area that the black pixel boundary layer 04 has, the flat layer 03 can effectively block light at any position compared to the black pixel boundary layer 04, and the flat layer 03 has a better light blocking effect.
[0059] As another optional implementation, the optical density (OD) value of the planarization layer 03 described in this embodiment can be greater than or equal to the optical density threshold, where optical density is also referred to as absorbance. That is, the planarization layer 03 described in this embodiment can be a high OD value film layer. Optionally, the optical density threshold can be greater than the optical density value of the black pixel defining layer 04. Correspondingly, based on this embodiment, the transmittance of the planarization layer 03 is less than the transmittance of the black pixel defining layer 04.
[0060] Since the higher the optical density value, the lower the light transmittance and the better the light blocking effect, by setting the flat layer 03 as a high OD value film layer, the light can be effectively blocked, thereby better reducing the reflection of incident light by the metal in the pixel circuit layer 02 and better improving the color separation phenomenon of the display panel.
[0061] For example, the optical density threshold can be 3. That is, the OD value of the planarization layer 03 is ≥3. Testing has shown that by setting the OD value of the planarization layer 03 to ≥3, the light transmittance can be controlled to ≤0.1%. For instance, assuming 1000 nits of incident light, only 1 nit of light can pass through the planarization layer 03. As described in the above embodiments, the high OD value of the planarization layer 03 provides better light-blocking performance than allowing 100 nits of the 1000 nits of incident light to pass through the black pixel defining layer 04.
[0062] Optionally, the material of the high OD value planarization layer 03 may include at least one of organic and inorganic materials, and the organic material may be doped with light-absorbing pigments to achieve the effect of high OD value.
[0063] For example, inorganic materials may include insulating molybdenum oxide (MoOx) or aluminum oxide (AlOx). Organic materials may include polyimide (PI) or acrylic.
[0064] Of course, the two optional implementation methods mentioned above can also be combined. That is, while setting the planarization layer 03 as a black planarization layer (BPLN), it can also be set as a high OD value film layer. In this way, the effective blocking of light can be further improved, resulting in a better light-blocking effect, thereby improving the color separation phenomenon of the display panel and ensuring a better display effect.
[0065] Optional, Figure 3 This is a schematic diagram of another display panel structure provided in an embodiment of this disclosure. For example... Figure 3 As shown, the pixel circuit layer 02 may include: an active layer Ac, a gate metal layer Gate, and a source & drain metal layer SD, sequentially stacked along a direction away from the substrate 01. The source & drain metal layer SD may include mutually spaced source electrodes S and drain electrodes D. Based on this, combined with Figure 3 It is understood that the reflection of incident light by the metal in pixel circuit layer 02 can refer to the reflection of incident light by the gate metal layer and / or the source / drain metal layer SD in pixel circuit layer 02. Furthermore, the display panel described in this embodiment may further include:
[0066] The first insulating layer J1 is located between the active layer Ac and the gate metal layer Gate.
[0067] The second insulating layer J2 is located between the gate metal layer (Gate) and the source / drain metal layer (SD).
[0068] Buffer layer B1 is located between substrate 01 and pixel circuit layer 02.
[0069] The protective (overcoat, OC) layer OC is located on the side of the black matrix layer 06 away from the substrate 01.
[0070] The first insulating layer J1 effectively insulates the active layer Ac from the gate metal layer, preventing signal interference. The second insulating layer J2 effectively insulates the gate metal layer from the source / drain metal layers SD, preventing signal interference. Both the first insulating layer J1 and the second insulating layer J2 can be gate insulators (GI) layers. The buffer layer B1 acts as a buffer, protecting the substrate O1. The protective layer OC can be used to protect the substrate O1 and the various film layers located between the substrate O1 and the organic protective layer OC. Optionally, the material of the protective layer OC can be an organic material, i.e., an organic protective layer.
[0071] In addition, continue to refer to Figure 3 It can also be seen that the light-emitting element L1 in this embodiment may include an anode and an electroluminescence (EL) layer EL stacked sequentially along a direction away from the substrate 01. The electrical connection between the pixel circuit layer 02 and the light-emitting element L1 may mean that the source / drain metal layer SD included in the pixel circuit layer 02 is electrically connected to the anode included in the light-emitting element L1.
[0072] Of course, the light-emitting element L1 may also include a cathode located on the side of the electroluminescent layer EL away from the substrate O1. Figure 3 (Not shown). The pixel circuit formed by the pixel circuit layer 02 can transmit a light-emitting drive signal to the anode of the light-emitting element L1. The cathode of the light-emitting element L1 can be electrically connected to a power supply terminal and receive a power supply signal transmitted from that power supply terminal. The electroluminescent layer EL of the light-emitting element L1 can emit light under the voltage difference between the light-emitting drive signal received by the anode and the power supply signal received by the cathode.
[0073] Optionally, the substrate 01 in this embodiment can be a flexible substrate, and the material of the flexible substrate may include polyimide (PI). Of course, in some other embodiments, the substrate 01 may also be a non-flexible substrate, for example, the material of the substrate 01 may include glass.
[0074] Optionally, the filter layer 07 in this embodiment may include a color filter CF. Of course, in some other embodiments, the filter layer 07 may also include a color resist, and this embodiment does not limit this.
[0075] Optional, continue to refer to Figure 3 As can be seen, the thickness h1 of the planarization layer 03 described in this embodiment can be greater than the thickness h2 of the black pixel defining layer 04. Here, the thickness direction is perpendicular to the bearing surface of the substrate 01, that is, the thickness direction can be perpendicular to the substrate surface. Figure 1 The direction X1 is shown. By setting the thickness of the planarization layer 03 to be thicker, a certain light-blocking effect can also be achieved, that is, the light-blocking ability of the planarization layer 03 can be further improved.
[0076] Optional, continue to refer to Figure 3 As can be seen, in this embodiment of the present disclosure, the orthogonal projection of the second opening K2 on the substrate 01 can cover the orthogonal projection of the first opening K1 on the substrate 01. Correspondingly, the orthogonal projection of the filter layer 07 in the second opening K2 on the substrate 01 can cover the orthogonal projection of the light-emitting element L1 in the first opening K1 on the substrate 01, thereby ensuring effective filtering of the light emitted by the light-emitting element L1.
[0077] Optional, Figure 4 This is a schematic diagram of the structure of another display panel provided in an embodiment of this disclosure. For example... Figure 4 As shown, the planarization layer 03 may include: a multilayer planarization film layer 031 stacked sequentially in a direction away from the substrate 01. Figure 4 The three flat film layers 031 are shown only schematically.
[0078] In this embodiment, at least one of the multi-layer planar film layers 031 may have a light transmittance no greater than that of the black pixel defining layer 04. That is, in this embodiment, in addition to the multi-layer planar film layers 031, one or more planar film layers 031 may be provided that, like the black pixel defining layer 04, have a good light-blocking effect. For example, one or more planar film layers 031 may be the black planar film layer and / or a high OD value film layer described in the above embodiments.
[0079] Optionally, the at least one flat film layer 031 may include: a flat film layer 031 closest to the black pixel boundary layer 04 among the multiple flat film layers 031. That is, at least the flat film layer 031 closest to the black pixel boundary layer 04 can be provided to have the same good light-blocking effect as the black pixel boundary layer 04. Of course, the light transmittance of each flat film layer is set not to be greater than the light transmittance of the black pixel boundary layer 04, that is, each flat film layer is set to have a good light-blocking effect, which can better achieve effective light blocking.
[0080] It should be noted that, Figure 3 and Figure 4 Only a first opening K1 and a corresponding second opening K2 are shown schematically.
[0081] In summary, this disclosure provides a display panel. The display panel includes a substrate, and a pixel circuit layer, a planarization layer, a black pixel definition layer, an encapsulation layer, and a black matrix layer stacked along a direction away from the substrate. The black pixel definition layer has a plurality of spaced-apart first openings for arranging light-emitting elements. The black matrix layer has a plurality of spaced-apart second openings for arranging a light filter layer. The pixel circuit layer drives the light-emitting elements to emit light, and the light emitted by the light-emitting elements is filtered by the light filter layer before being emitted, enabling the display panel to display an image. Thus, this display panel is a COE panel that does not require a polarizer. Because the transmittance of the planarization layer is no greater than that of the black pixel definition layer, a dual light-shielding effect can be achieved through the black pixel definition layer and the planarization layer, preventing external light from incident on the display panel and causing reflection, improving color separation of the display panel, and ensuring better display performance.
[0082] Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of this disclosure. Figure 5 As shown, the display device includes: a driving circuit 10, and a display panel 00 as described in the above embodiments.
[0083] The driving circuit 10 is electrically connected to the display panel 00 and is used to drive the display panel 00 to emit light.
[0084] Optionally, the display device described in the embodiments of this disclosure can be any product or component with display function, such as an OLED display device, a mobile phone, a tablet computer, a flexible display device, a television, and a monitor.
[0085] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.
[0086] Furthermore, the terminology used in the embodiments of this disclosure is for the purpose of explaining the embodiments of this disclosure only and is not intended to limit this disclosure. Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should be understood in their ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains.
[0087] For example, in embodiments of this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.
[0088] Similarly, words like "one" or "one" do not indicate a quantity limit, but rather that there is at least one.
[0089] The word “includes” or similar terms means that the elements or objects preceding “includes” or “include” cover the elements or objects listed after “includes” or “include” or their equivalents, and do not exclude other elements or objects.
[0090] "Up," "down," "left," or "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0091] The "and / or" signifies that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0092] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.
Claims
1. A display panel, characterized in that, The display panel includes: Substrate; Located on one side of the substrate and stacked sequentially in a direction away from the substrate, are a pixel circuit layer, a planarization layer, a black pixel definition layer, an encapsulation layer, and a black matrix layer. The black pixel definition layer has multiple first openings, and the black matrix layer has multiple second openings. The multiple first openings and the multiple second openings are arranged at intervals along a direction parallel to the bearing surface of the substrate and correspond one-to-one. The black pixel definition layer has a ramp region located on at least one side of the first opening, and the orthographic projection of the ramp region on the substrate lies within the orthographic projection of the planarization layer on the substrate. On the bearing surface perpendicular to the substrate, the thickness of the portion of the black pixel definition layer located within the ramp region is less than the thickness of the portion of the black pixel definition layer located outside the ramp region. A light-emitting element is located in each of the first openings, the light-emitting element being located on the side of the planarization layer opposite to the substrate; In addition, a filter layer is located in each of the second openings, and the color of the filter layer in each of the second openings is the same as the color of the light-emitting element in the corresponding first opening; The light transmittance of the planarization layer is not greater than that of the black pixel delimiting layer.
2. The display panel according to claim 1, characterized in that, The planarization layer is a black planarization layer.
3. The display panel according to claim 2, characterized in that, The material of the black planarization layer is the same as the material of the black pixel delimiting layer.
4. The display panel according to claim 3, characterized in that, The materials of the black planarization layer and the black pixel defining layer both include carbon black additives.
5. The display panel according to claim 1 or 2, characterized in that, The optical density value of the planarization layer is greater than or equal to the optical density threshold, and the optical density threshold is greater than the optical density value of the black pixel delimiting layer.
6. The display panel according to claim 5, characterized in that, The optical density threshold is 3.
7. The display panel according to claim 5, characterized in that, The material of the planarization layer includes at least one of organic and inorganic materials, wherein the organic material is doped with light-absorbing pigments.
8. The display panel according to claim 7, characterized in that, The inorganic materials include: molybdenum oxide or aluminum oxide.
9. The display panel according to claim 7, characterized in that, The organic material includes: polyimide or acrylic.
10. The display panel according to any one of claims 1 to 4, and 6 to 9, characterized in that, The planarization layer comprises: multiple planarization film layers stacked sequentially in a direction away from the substrate; Among the multilayer planar film layers, the light transmittance of at least one planar film layer is not greater than the light transmittance of the black pixel defining layer.
11. The display panel according to claim 10, characterized in that, The at least one flat film layer includes: a flat film layer near the black pixel defining layer among the multilayer flat film layers.
12. The display panel according to any one of claims 1 to 4, and 6 to 9, characterized in that, The thickness of the planarization layer is greater than the thickness of the black pixel defining layer, and the thickness direction is perpendicular to the bearing surface of the substrate.
13. The display panel according to any one of claims 1 to 4, and 6 to 9, characterized in that, The filter layer includes a color filter.
14. The display panel according to any one of claims 1 to 4, and 6 to 9, characterized in that, The pixel circuit layer includes: an active layer, a gate metal layer, and a source / drain metal layer sequentially stacked along a direction away from the substrate; the display panel further includes: A first insulating layer is located between the active layer and the gate metal layer; A second insulating layer is located between the gate metal layer and the source / drain metal layer; A buffer layer located between the substrate and the pixel circuit layer; And a protective layer located on the side of the black matrix layer away from the substrate.
15. A display device, characterized in that, The display device includes: a driving circuit, and a display panel as described in any one of claims 1 to 14; The driving circuit is electrically connected to the display panel and is used to drive the display panel to emit light.