Display panel and display device

Abstract

This application provides a display panel and a display device. The display panel includes a first display area and a second display area. The display panel includes a substrate, a first light-emitting unit, and a second light-emitting unit. The first light-emitting unit is disposed on one side of the substrate within the first display area. The first light-emitting unit includes m light-emitting layers, where m is an integer greater than or equal to 2. The m light-emitting units include a first light-emitting layer and a second light-emitting layer. The orthographic projections of the first light-emitting layer onto the substrate and the orthographic projections of the second light-emitting layer onto the substrate at least partially overlap. The second light-emitting unit is disposed on one side of the substrate within the second display area. The second light-emitting unit includes n light-emitting layers, where n is an integer greater than or equal to 1. The effective light-emitting area of ​​the first light-emitting unit is different from that of the second light-emitting unit. Embodiments of this application can improve the brightness uniformity of different areas and improve the display effect.

Description

Technical Field

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

[0002] With the development of technology, organic light-emitting diode (OLED) displays are becoming increasingly popular and widely used. OLED displays offer advantages such as self-illumination, wide viewing angle, high contrast, and short response time, demonstrating promising prospects.

[0003] However, in organic display devices, the structures in different areas are not the same, which can easily lead to deviations in the light emission effect and uneven brightness. Summary of the Invention

[0004] This application provides a display panel and display device that can improve the display uniformity of different areas.

[0005] In a first aspect, embodiments of this application provide a display panel, including a first display area and a second display area. The display panel includes a substrate, a first light-emitting unit and a second light-emitting unit. The first light-emitting unit is disposed on one side of the substrate in the first display area. The first light-emitting unit includes m light-emitting layers, where m is an integer greater than or equal to 2. The m light-emitting units include the first light-emitting layer and the second light-emitting layer. The orthographic projection of the first light-emitting layer on the substrate and the orthographic projection of the second light-emitting layer on the substrate at least partially overlap.

[0006] The second light-emitting unit is located within the second display area and disposed on one side of the substrate. The second light-emitting unit includes n light-emitting layers, where n is an integer greater than or equal to 1. The effective light-emitting area of ​​the first light-emitting unit differs from that of the second light-emitting unit. The effective light-emitting area is either the projected area of ​​the first or second light-emitting unit onto the substrate, or the sum of the projected areas of each light-emitting layer in the first or second light-emitting unit onto the substrate.

[0007] Secondly, embodiments of this application provide a display device, including the display panel in any of the foregoing embodiments.

[0008] This application provides a display panel and display device. By setting a first light-emitting unit in a first display area and a second light-emitting unit in a second display area, and setting the effective light-emitting areas of the first light-emitting unit and the second light-emitting unit to be different, the brightness of the first display area and the second display area can be adjusted, thereby improving the brightness uniformity of different areas and improving the display effect. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0011] Figure 2 yes Figure 1 A magnified structural diagram of region Q in the middle region;

[0012] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of AA;

[0013] Figure 4 yes Figure 3 A magnified schematic diagram of the first light-emitting unit;

[0014] Figure 5 yes Figure 1 A magnified structural diagram of region P in the middle;

[0015] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of BB;

[0016] Figure 7 yes Figure 6 A magnified schematic diagram of the second light-emitting unit;

[0017] Figure 8 This is a top view of the structure of the first light-emitting unit in a display panel provided in an embodiment of this application;

[0018] Figure 9 yes Figure 8 A schematic diagram of the cross-sectional structure of CC;

[0019] Figure 10 This is a cross-sectional structural diagram of BB in a display panel provided in an embodiment of this application;

[0020] Figure 11 yes Figure 10 A simplified schematic diagram of the structure shown;

[0021] Figure 12 This is a cross-sectional structural diagram of the second light-emitting unit in a display panel provided in an embodiment of this application;

[0022] Figure 13 This is a simplified structural diagram of the second and third light-emitting units in a display panel provided in an embodiment of this application;

[0023] Figure 14 This is a magnified structural diagram of region Q in a display panel provided in an embodiment of this application;

[0024] Figure 15 This is a magnified structural diagram of region P in a display panel provided in an embodiment of this application;

[0025] Figure 16 yes Figure 14 A schematic diagram of the cross-sectional structure of DD;

[0026] Figure 17 This is a schematic diagram of the structure of a display device provided in an embodiment of this application.

[0027] Marker explanation:

[0028] 1. Substrate;

[0029] 2. First light-emitting unit; 21. First light-emitting layer; 22. Second light-emitting layer; 23. Fifth light-emitting layer; 24. First connecting layer; 241. First doped layer; 242. Second doped layer;

[0030] 3. Second light-emitting unit; 31. Third light-emitting layer; 32. Fourth light-emitting layer; 33. Second connecting layer; 331. Third doped layer; 332. Fourth doped layer; 333. Through-hole; 34. Seventh light-emitting layer;

[0031] 4. Driver chip;

[0032] 5. Pixel definition layer; 51. First opening; 52. Second opening;

[0033] 6. Third light-emitting unit; 61. Sixth light-emitting layer;

[0034] 71. First barrier post; 72. Second barrier post;

[0035] 8. Array layer;

[0036] 91. Cathode; 92. Anode; 93. Hole transport layer;

[0037] AA, Display area; A1, First display area; A2, Second display area; NA, Non-display area;

[0038] X, thickness direction. Detailed Implementation

[0039] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0040] 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..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0041] The display panel includes a variety of functional film layers. For example, the display panel includes an array substrate, a light-emitting device layer, and an encapsulation layer, etc. The array substrate includes a driving circuit, the light-emitting device layer includes a light-emitting unit, and the driving circuit is electrically connected to the light-emitting unit and controls the light intensity of the light-emitting unit.

[0042] The structures of different areas within a display panel vary. For example, the arrangement of light-emitting units or the structure of individual light-emitting units in different areas of the display panel may differ, resulting in different transmittance in different areas. Alternatively, the wiring of the driving circuits in different areas within the display panel may differ to achieve different driving functions. These structural differences within the display panel can easily lead to varying brightness in different areas, thus affecting the normal visual perception of the human eye.

[0043] To resolve the above issues, please refer to Figures 1 to 7This application provides a display panel including a first display area A1 and a second display area A2. The display panel includes a substrate 1, a first light-emitting unit 2 and a second light-emitting unit 3. The first light-emitting unit 2 is disposed in the first display area A1 on one side of the substrate 1. The first light-emitting unit 2 includes m light-emitting layers, where m is an integer greater than or equal to 2. The m light-emitting units include a first light-emitting layer 21 and a second light-emitting layer 22. The orthographic projection of the first light-emitting layer 21 on the substrate 1 and the orthographic projection of the second light-emitting layer 22 on the substrate 1 at least partially overlap.

[0044] The second light-emitting unit 3 is located within the second display area A2 and disposed on one side of the substrate 1. The second light-emitting unit 3 includes n light-emitting layers, where n is an integer greater than or equal to 1. The effective light-emitting area of ​​the first light-emitting unit 2 is different from the effective light-emitting area of ​​the second light-emitting unit 3.

[0045] The display panel includes a display area AA and a non-display area NA surrounding the outer periphery of the display area AA. The first display area A1 and the second display area A2 are both located within the display area AA.

[0046] Substrate 1 can be a rigid substrate, such as made of glass. Alternatively, substrate 1 can be a flexible substrate, such as made of a light-transmitting material like polyimide (PI). The first light-emitting unit 2 and the second light-emitting unit 3 are located on the same side of substrate 1. Both the first light-emitting unit 2 and the second light-emitting unit 3 are used to achieve the light-emitting effect. The first display area A1 and the second display area A2 cooperate to display a specific image. For example, in addition to the first light-emitting unit 2, the first display area A1 also includes light-emitting units of various other light-emitting colors, including but not limited to red, green, and blue. The second display area A2 is similarly configured.

[0047] like Figure 3 and Figure 4 As shown, the first light-emitting unit 2 includes m light-emitting layers, where m is an integer greater than or equal to 2, meaning the light emitted by the first light-emitting unit 2 is the collection of light emitted by multiple light-emitting layers. Specifically, the first light-emitting unit 2 also includes a hole transport layer (not shown) and an anode 92 on the side of the m light-emitting layers facing the substrate 1, and an electron transport layer (not shown) and a cathode 91 on the side away from the substrate 1. A first connecting layer 24 connects adjacent light-emitting layers, serving to connect adjacent light-emitting layers in series. Under the combined drive of the cathode 91 and the anode 92, electrons and holes are transported to the nearest light-emitting layer through the electron transport layer and hole transport layer, respectively, and then transported to the adjacent light-emitting layer through the first connecting layer 24. Multiple light-emitting layers emit light together, thereby emitting a stronger light than a single light-emitting layer. This allows the first light-emitting unit 2 to emit brighter light without increasing the driving current.

[0048] The m light-emitting layers include a first light-emitting layer 21 and a second light-emitting layer 22. It should be noted that the phrase "the orthographic projection of the first light-emitting layer 21 on the substrate 1 and the orthographic projection of the second light-emitting layer 22 on the substrate 1 at least partially overlap" mentioned in the embodiments of this application means that the first light-emitting layer 21 has a first orthographic projection on the substrate 1, the second light-emitting layer 22 has a second orthographic projection on the substrate 1, and there is an overlapping area between the first orthographic projection and the second orthographic projection.

[0049] When the first light-emitting unit 2 emits light, the first light-emitting layer 21 and the second light-emitting layer 22 emit light together, and emit stronger light at the corresponding positions in the overlapping area, thereby increasing the brightness. Optionally, the orthographic projections of the first light-emitting layer 21 and the second light-emitting layer 22 onto the substrate 1 coincide with each other.

[0050] Furthermore, in addition to the first light-emitting layer 21 and the second light-emitting layer 22, the m light-emitting layers in the first light-emitting unit 2 may also include other light-emitting layers. For example, such as... Figure 4 As shown, the first light-emitting unit 2 also includes a fifth light-emitting layer 23.

[0051] It should be noted that the emission colors of each emission layer in the first light-emitting unit 2 can be the same or different, and this application embodiment does not impose any limitation on this. When at least some of the emission layers in the first light-emitting unit 2 have the same emission color, the color of the light emitted by the first light-emitting unit 2 is the emission color of any one of the emission layers; when at least some of the emission layers in the first light-emitting unit 2 have different emission colors, the color of the light emitted by the first light-emitting unit 2 is a mixture of the emission colors of each emission layer. For example, Figure 4 The light emitted by the first light-emitting layer 21, the second light-emitting layer 22 and the fifth light-emitting layer 23 in the first light-emitting unit 2 is blue light, therefore the color of the light emitted by the first light-emitting unit 2 is blue.

[0052] The second light-emitting unit 3 includes n light-emitting layers, where n is an integer greater than or equal to 1. That is, the second light-emitting unit 3 can emit light using a single light-emitting layer or by multiple light-emitting layers emitting light together. When the second light-emitting unit 3 includes multiple light-emitting layers, its structure can be similar to that of the first light-emitting unit 2, which will not be described in detail in the embodiments of this application. For example, as... Figure 7 As shown, the second light-emitting unit 3 includes two light-emitting layers: a third light-emitting layer 31 and a fourth light-emitting layer 32.

[0053] The embodiments of this application do not limit the number of m and n, that is, m can be greater than n, m can be less than n, or m can be equal to n.

[0054] In addition to the substrate 1, the first light-emitting unit 2, and the second light-emitting unit 3, the display panel may also include other functional film layers. For example, the display panel further includes an array layer 8 located between the substrate 1 and the first light-emitting unit 2. The array layer 8 has multiple metal traces disposed therein to form a driving circuit, and also includes thin-film transistors (TFTs). At least some of the TFTs are connected to the anodes 92 of the first light-emitting unit 2 and the second light-emitting unit 3 to control the light emission of the first light-emitting unit 2 and the second light-emitting unit 3.

[0055] In the embodiments of this application, the effective light-emitting area of ​​the first light-emitting unit 2 is different from that of the second light-emitting unit 3. The effective light-emitting area is the orthogonal projection area of ​​the first light-emitting unit 2 or the second light-emitting unit 3 on the substrate 1, or the effective light-emitting area is the sum of the orthogonal projection areas of each light-emitting layer in the first light-emitting unit 2 or the second light-emitting unit 3 on the substrate 1.

[0056] Specifically, when the effective light-emitting area is the projected area of ​​the first light-emitting unit 2 or the second light-emitting unit 3 on the substrate 1, such as Figure 2 As shown, the "projected area of ​​the first light-emitting unit 2 on the substrate 1" mentioned here refers to the area S1 of the entire assembly of m light-emitting layers in the first light-emitting unit 2 projected onto the substrate 1, which represents the display area of ​​the first light-emitting unit 2. Similarly, the "projected area of ​​the second light-emitting unit 3 on the substrate 1" is calculated in the same way. Figure 5 As shown, the orthogonal projection area of ​​the second light-emitting unit 3 on the substrate 1 refers to the area S2 formed by the orthogonal projection of the entire assembly of n light-emitting layers in the second light-emitting unit 2 onto the substrate 1.

[0057] Therefore, the effective light-emitting area of ​​the first light-emitting unit 2 is different from that of the second light-emitting unit 3, meaning that the display area of ​​a single first light-emitting unit 2 is different from that of a single second light-emitting unit 3. Based on this, the uniformity of the display brightness of the first display area A1 and the second display area A2 can be improved by adjusting the display areas of a single first light-emitting unit 2 and a single second light-emitting unit 3, thereby enhancing the display effect.

[0058] It should be noted that when the orthographic projections of each light-emitting layer in the first light-emitting unit 2 onto the substrate 1 coincide, the effective light-emitting area of ​​the first light-emitting unit 2 is equal to the orthographic projection area of ​​a single light-emitting layer onto the substrate 1; however, when the orthographic projections of each light-emitting layer in the first light-emitting unit 2 onto the substrate 1 are misaligned, the effective light-emitting area of ​​the first light-emitting unit 2 is greater than the orthographic projection area of ​​a single light-emitting layer onto the substrate 1, but less than the sum of the orthographic projection areas of all light-emitting layers onto the substrate 1.

[0059] When the effective light-emitting area is the sum of the projected areas of each light-emitting layer in the first light-emitting unit 2 or the second light-emitting unit 3 onto the substrate 1, the light-emitting regions in the m light-emitting layers will each form a specific projected area on the substrate 1. The phrase "the sum of the projected areas of each light-emitting layer in the first light-emitting unit 2 onto the substrate 1" refers to the total projected area of ​​each of the m light-emitting layers. In other words, the effective light-emitting area in the first light-emitting unit 2 depends on the number of light-emitting layers in the first light-emitting unit 2 and the projected area of ​​each light-emitting layer onto the substrate 1. The same logic applies to "the sum of the projected areas of each light-emitting layer in the second light-emitting unit 3 onto the substrate 1."

[0060] For example, when the first light-emitting unit 2 includes three light-emitting layers: a first light-emitting layer 21, a second light-emitting layer 22, and a fifth light-emitting layer 23, the projected area of ​​the first light-emitting layer 21 on the substrate 1 is S11, the projected area of ​​the second light-emitting layer 22 on the substrate 1 is S12, and the projected area of ​​the fifth light-emitting layer 23 on the substrate 1 is S13. In this case, the effective light-emitting area of ​​the first light-emitting unit 2 is S11 + S12 + S13.

[0061] The sum of the projected areas of each light-emitting layer in the first light-emitting unit 2 onto the substrate 1 and the number of light-emitting layers are generally positively correlated with the brightness of the first light-emitting unit 2. Therefore, by changing the effective light-emitting area of ​​the first light-emitting unit 2 and the second light-emitting unit 3, the brightness of a single first light-emitting unit 2 and the second light-emitting unit 3 can be adjusted, thereby helping to improve the brightness uniformity of the first display area A1 and the second display area A2 and improve the display effect.

[0062] In summary, this embodiment of the application sets a first light-emitting unit 2 in the first display area A1 and a second light-emitting unit 3 in the second display area A2, and sets the effective light-emitting areas of the first light-emitting unit 2 and the second light-emitting unit 3 to be different, thereby achieving the adjustment of the brightness of the first display area A1 and the second display area A2, thereby improving the brightness uniformity of different areas and improving the display effect.

[0063] In some embodiments, please refer to Figure 4 and Figure 7 The number of light-emitting layers m in the first light-emitting unit 2 and the number of light-emitting layers n in the second light-emitting unit 3 satisfy the relationship: m > n.

[0064] The number of light-emitting layers in the first light-emitting unit 2 is greater than the number of light-emitting layers in the second light-emitting unit 3. For example, the first light-emitting unit 2 includes three light-emitting layers: a first light-emitting layer 21, a second light-emitting layer 22, and a fifth light-emitting layer 23, while the second light-emitting unit 3 includes two light-emitting layers: a third light-emitting layer 31 and a fourth light-emitting layer 32.

[0065] This design allows the first light-emitting unit 2 to emit a brighter light than the second light-emitting unit 3, while maintaining the same display area and driving current. In other words, it enables the first light-emitting unit 2 to emit light of the same intensity as the second light-emitting unit 3 within a smaller display area, thereby improving the brightness uniformity of the first display area A1 and the second display area A2.

[0066] In some embodiments, the transmittance of the first display area A1 is greater than that of the second display area A2. A photosensitive element may be arranged on the display panel at a position corresponding to the first display area A1, thereby achieving a full-screen display effect.

[0067] Specifically, in electronic devices such as mobile phones and tablets, photosensitive elements such as front-facing cameras, infrared light sensors, and proximity sensors need to be integrated on one side of the display panel to achieve specific functions such as under-display recognition. In some solutions, a photosensitive area can be set within the display area AA of the aforementioned electronic device, with the photosensitive element placed behind the photosensitive area. The photosensitive area itself can also accommodate light-emitting units to achieve a light-emitting effect. This allows for full-screen display of the electronic device while ensuring the photosensitive element functions properly. However, compared to other areas of the display area AA, the display panel needs to have higher transmittance at the photosensitive area to allow ambient light to enter the photosensitive element.

[0068] In this embodiment, the first display area A1 is the photosensitive area, and the second display area A2 is the area within the display area A1 excluding the photosensitive area. Since the number of light-emitting layers of the first light-emitting unit 2 in the first display area A1 is greater than the number of light-emitting layers of the second light-emitting unit 3 in the second display area A2, the first light-emitting unit 2 can emit light of the same intensity as the second light-emitting unit 3 with a smaller display area. Furthermore, by reducing the size or density of the first light-emitting unit 2, both conditions can be met: the transmittance of the first display area A1 is greater than that of the second display area A2, and the luminous intensity of the first display area A1 is the same as that of the second display area A2. This ensures display uniformity while satisfying the photosensitive function.

[0069] In some embodiments, such as Figure 1 , Figure 3 as well as Figure 6 As shown, the display panel also includes a driver chip 4, and the first display area A1 is positioned further away from the driver chip 4 relative to the first display area A1.

[0070] Please refer to the following: Figure 4 and Figure 8The driver chip 4 is used to control the light emission of the first display area A1 and the second display area A2, and is electrically connected to the first light-emitting unit 2 and the second light-emitting unit 3 through the driver circuit. Generally, the light-emitting unit farther away from the driver chip 4 requires a longer driver circuit to connect, which can easily lead to a larger accumulated resistance value in the driver circuit, resulting in a smaller driving current transmitted to that light-emitting unit.

[0071] Since the first display area A1 is located further away from the driver chip 4, the driving current received by the first light-emitting unit 2 is typically less than that received by the second light-emitting unit 3. Based on this, the embodiments of this application set the number of light-emitting layers in the first light-emitting unit 2 to be greater than that in the second light-emitting unit 3. Under the same conditions, the first light-emitting unit 2 can emit light of the same intensity as the second light-emitting unit 3 with a smaller driving current, thereby improving display uniformity.

[0072] It should be noted that the magnitude of the driving current is often closely related to the lifespan of the display panel. Specifically, when the driving current applied to the first light-emitting unit 2 is too large, the first light-emitting unit 2 is prone to aging and yellowing, thereby affecting the display effect of the first display area A1 and the lifespan of the display panel.

[0073] Furthermore, in this embodiment, the first display area A1 can be a photosensitive area, or it can be any area other than the photosensitive area in the display area AA; this embodiment does not impose any limitations. When the first display area A1 is also a photosensitive area, the display area of ​​the first light-emitting unit 2 and the number of internal light-emitting layers can be adjusted simultaneously to make the luminous brightness of the first display area A1 the same as that of the second display area A2.

[0074] In some embodiments, such as Figure 1 , Figure 3 as well as Figure 6 As shown, the minimum distance between the first display area A1 and the non-display area NA is L1, and the minimum distance between the second display area A2 and the non-display area NA is L2; ​​where L1 < L2.

[0075] The minimum distance L1 between the first display area A1 and the non-display area NA is less than the minimum distance L2 between the second display area A2 and the non-display area NA. This means the first display area A1 is closer to the non-display area NA than the second display area A2. In existing display panels, the boundary between the display area AA and the non-display area NA is prone to darkening. To address this, this embodiment sets the number of light-emitting layers in the first light-emitting unit 2 of the first display area A1 to be greater than the number of light-emitting layers in the second light-emitting unit 3. This allows the first display area A1, which is closer to the non-display area NA, to have higher display brightness, thereby alleviating the darkening problem at the boundary between the display area AA and the non-display area NA and improving display uniformity.

[0076] In some embodiments, such as Figure 2 and Figure 5 As shown, the transmittance of the first display area A1 is greater than that of the second display area A2. The first light-emitting unit 2 and the second light-emitting unit 3 emit the same color. In the first display area A1, the minimum distance between two adjacent first light-emitting units 2 is D1. In the second display area A2, the distance between two adjacent second light-emitting units 3 is D2. Wherein, D1-D2>0.

[0077] The spacing between adjacent light-emitting units depends on the pixel density and the size of the light-emitting units in that area. Specifically, when the distribution density of the first light-emitting unit 2 in the first display area A1 is the same as the distribution density of the second light-emitting unit 3 in the second display area A2, the projected area of ​​the first light-emitting unit 2 on the substrate can be set to be smaller than the projected area of ​​the second light-emitting unit 3 on the substrate by controlling the size of the first light-emitting unit 2 and the second light-emitting unit 3, so that the spacing D1 between adjacent first light-emitting units 2 is greater than the spacing D2 between adjacent second light-emitting units 3.

[0078] When the projected area of ​​the first light-emitting unit 2 on the substrate is the same as the projected area of ​​the second light-emitting unit 3 on the substrate, the distribution density of the first light-emitting unit 2 in the first display area A1 can be reduced to be less than the distribution density of the second light-emitting unit 3 in the second display area A2, thereby making the spacing D1 between the first light-emitting units 2 greater than the spacing D2 between adjacent second light-emitting units 3.

[0079] In this embodiment, the first display area A1 is the photosensitive area, and the area between adjacent first light-emitting units 2 is the area in the display panel that allows external light to enter, thereby achieving the photosensitive function. Based on this, by making the minimum spacing between adjacent first light-emitting units 2 greater than the minimum spacing between adjacent second light-emitting units 3, more areas within the first display area A1 can achieve the photosensitive function, thereby making the transmittance of the display panel in the first display area A1 greater than the transmittance in the second display area A2, thus satisfying the photosensitive requirements of the display panel.

[0080] In some embodiments, the projected area S1 of the first light-emitting unit 2 on the substrate 1 is smaller than the projected area S2 of the second light-emitting unit 3 on the substrate 1. By reducing the display area of ​​the first light-emitting unit 2, the minimum spacing D1 between adjacent first light-emitting units 2 can be made larger than the minimum spacing D2 between adjacent second light-emitting units 3 without changing the distribution density of the first light-emitting unit 2 and the second light-emitting unit 3, thereby increasing the transmittance of the display panel in the first display area A1.

[0081] In this embodiment of the application, optionally, the sum of the projected areas of the light-emitting regions of each light-emitting layer in the first light-emitting unit 2 onto the substrate 1 is greater than the sum of the projected areas of the light-emitting regions of each light-emitting layer in the second light-emitting unit 3 onto the substrate 1.

[0082] It should be noted that the areas in the m light-emitting layers of the first light-emitting unit 2 that can achieve the light-emitting effect each have their own orthographic projection on the substrate 1. The "sum of the orthographic projection areas of the light-emitting regions of each light-emitting layer in the first light-emitting unit 2 on the substrate 1" mentioned in the embodiments of this application refers to the sum of the above m orthographic projection areas. The same applies to "the sum of the orthographic projection areas of the light-emitting regions of each light-emitting layer in the second light-emitting unit 3 on the substrate 1".

[0083] As can be seen from the above, although the projected area of ​​the first light-emitting unit 2 on the substrate 1 in this embodiment is smaller than that of the second light-emitting unit 3, the number of light-emitting layers in the first light-emitting unit 2 can be greater than the number of light-emitting layers in the second light-emitting unit 3. Therefore, by adjusting the number of light-emitting layers in the first light-emitting unit 2 and the projected area of ​​each light-emitting layer on the substrate 1, the sum of the projected areas of the light-emitting regions of each light-emitting layer in the first light-emitting unit 2 on the substrate 1 can be made greater than the sum of the projected areas of the light-emitting regions of each light-emitting layer in the second light-emitting unit 3 on the substrate 1. That is, under the same driving current, the first light-emitting unit 2 can emit light with a brightness greater than or equal to that of the second light-emitting unit 3.

[0084] This design can improve the transmittance of the first display area while ensuring a high luminous brightness in the first display area A1, thus achieving uniformity with the luminous brightness in the second display area A2. Furthermore, the display panel provided in this embodiment does not require an additional increase in the driving current within the first display area A1 to achieve the same display brightness as the second display area A2. Therefore, it reduces the risk of aging and yellowing of the first light-emitting unit 2 in the first display area A1 due to excessive driving current, thereby extending the lifespan of the display panel.

[0085] It should be noted that, in the embodiments of this application, the density of the first light-emitting unit 2 in the first display area A1 may be the same as or different from the density of the second light-emitting unit 3.

[0086] In some embodiments, the projected area S1 of the first light-emitting unit 2 on the substrate 1 is not less than the projected area S2 of the second light-emitting unit 3 on the substrate 1. The density of the first light-emitting unit 2 in the first display area A1 is less than the density of the second light-emitting unit 3 in the second display area A2.

[0087] From the perspective of transmittance, since the number of light-emitting layers in the first light-emitting unit 2 is greater than the number of light-emitting layers in the second light-emitting unit 3, and the projected area of ​​the first light-emitting unit 2 on the substrate 1 is greater than or equal to the projected area of ​​the second light-emitting unit 3 on the substrate 1, in order to improve the transmittance in the first display area A1, the density of the first light-emitting units 2 in the first display area A1 needs to be less than the density of the second light-emitting units 3 in the second display area A2. That is, within the same display area, the number of first light-emitting units 2 in the first display area A1 is less than the number of second light-emitting units 3 in the second display area A2.

[0088] From the perspective of luminous brightness, since the density of the first light-emitting unit 2 in the first display area A1 is less than the density of the second light-emitting unit 3 in the second light-emitting unit 3, in order to ensure that the first display area A1 and the second display area A2 have the same display brightness, it is necessary to control the luminous brightness of a single first light-emitting unit 2 to be greater than the luminous brightness of a single second light-emitting unit 3. In this embodiment, by controlling the number of light-emitting layers in the first light-emitting unit 2 to be greater than the number of light-emitting units in the second light-emitting unit 3, and by controlling the display area of ​​the first light-emitting unit 2 to be greater than the display area of ​​the second display area A2, the luminous brightness of the first light-emitting unit 2 can be greater than the luminous brightness of the second light-emitting unit 3, thereby making the brightness of the first display area A1 and the second display area A2 uniform.

[0089] In summary, the embodiments of this application control the light-emitting area of ​​the first light-emitting unit 2 and the second light-emitting unit 3, as well as the density of the first light-emitting unit 2 and the second light-emitting unit 3. This allows the first display area A1 to have a higher transmittance than the second display area A2, meeting the photosensitivity requirements. Simultaneously, it also increases the brightness of a single first light-emitting unit 2, resulting in uniform brightness between the first display area A1 and the second display area A2.

[0090] In some embodiments, such as Figure 3 and Figure 4 As shown, the display panel also includes a pixel definition layer 5 disposed on one side of the substrate 1. The pixel definition layer 5 includes a first opening 51 extending through the substrate 1 in the thickness direction X. The first light-emitting unit 2 is at least partially located inside the first opening 51. In some optional embodiments, the first light-emitting layer 21 is at least partially located outside the first opening 51.

[0091] When the first display area A1 is a photosensitive area, the pixel definition layer 5 can be made of a transparent material. The first opening 51 in the pixel definition layer 5 is used to define the position of the light-emitting layer in the first light-emitting unit 2, for example, as shown... Figure 7 As shown, the pixel definition layer 5 also includes a second opening 52, which is used to define the position of the light-emitting layer in the second light-emitting unit 3.

[0092] The first light-emitting layer 21 is partially located within the first opening 51, with a portion extending outside the first opening 51. This design increases the projected area of ​​the first light-emitting layer 21 onto the substrate 1, allowing it to have a larger light-emitting area. Optionally, the second light-emitting layer 22 is entirely located within the first opening 51. In this case, a portion of the first light-emitting layer 21 projected onto the substrate 1 will not overlap with the second light-emitting layer 22, and the presence of the second light-emitting layer 22 enhances the luminous intensity of the portion of the first light-emitting layer 21 located within the first opening 51.

[0093] In some embodiments, such as Figure 7 As shown, n is an integer greater than or equal to 2. The n light-emitting layers in the second light-emitting unit 3 include a third light-emitting layer 31 and a fourth light-emitting layer 32. The orthographic projection of the third light-emitting layer 31 on the substrate 1 and the orthographic projection of the fourth light-emitting layer 32 on the substrate 1 overlap at least partially. The orthographic projection area of ​​the third light-emitting layer 31 on the substrate 1 is greater than the orthographic projection area of ​​the fourth light-emitting layer 32 on the substrate 1.

[0094] In this embodiment, the second light-emitting unit 3 has multiple light-emitting layers. A second connecting layer 33 can also be provided between adjacent light-emitting layers in the second light-emitting unit 3, enabling series light emission from adjacent light-emitting layers. The n light-emitting layers include a third light-emitting layer 31 and a fourth light-emitting layer 32. The phrase "the orthographic projection of the third light-emitting layer 31 onto the substrate 1 and the orthographic projection of the fourth light-emitting layer 32 onto the substrate 1 at least partially overlap" mentioned in this embodiment means that the third light-emitting layer 31 has a third orthographic projection on the substrate 1, and the fourth light-emitting layer 32 has a fourth orthographic projection on the substrate 1, with an overlapping area between the third and fourth orthographic projections. When the third light-emitting unit 6 is used for display, the third light-emitting layer 31 and the fourth light-emitting layer 32 emit light together, and emit stronger light at the corresponding position in the overlapping area, thereby increasing the brightness.

[0095] For the first light-emitting unit 2 and the second light-emitting unit 3, it can be as follows: Figure 5 and Figure 6 As shown, the number m of light-emitting layers in the first light-emitting unit 2 is set to be greater than the number n of light-emitting layers in the second light-emitting unit 3. Alternatively, m can be set to be less than n, or even m and n can be set to the same number. This embodiment of the application does not impose any restrictions on this.

[0096] To ensure that the first display area A1 and the second display area A2 have the same display brightness, the first light-emitting unit 2 and the second light-emitting unit 3 need to be adjusted. In addition to adjusting all the light-emitting layers in the first light-emitting unit 2 or the second light-emitting unit 3 simultaneously, certain specific light-emitting layers in the second light-emitting unit 3 can also be adjusted.

[0097] In this embodiment, by reducing the size of the fourth light-emitting layer 32, its projected area on the substrate 1 is smaller than that of the third light-emitting layer 31 on the substrate 1, thereby reducing the luminous brightness of the second light-emitting unit 3 to a certain extent, so that the first display area A1 and the second display area A2 can achieve uniform brightness. Similarly, the size of some light-emitting layers in the first light-emitting unit 2 can be increased, thereby increasing the luminous brightness of the first light-emitting unit 2 and improving the brightness uniformity of the first display area A1 and the second display area A2.

[0098] It should be noted that the light emitted by each light-emitting layer in the second light-emitting unit 3 can be the same or different, and this application embodiment does not impose any restrictions on this. When at least some of the light-emitting layers in the second light-emitting unit 3 have different light-emitting colors, the color of the light emitted by the second light-emitting unit 3 is a mixture of the light-emitting colors of each light-emitting layer.

[0099] In some embodiments, such as Figure 6 and Figure 7 As shown, the fourth light-emitting layer 32 is located on the side of the third light-emitting layer 31 that is away from the substrate 1.

[0100] Compared to the third light-emitting layer 31, the fourth light-emitting layer 32 is closer to the light-emitting surface of the display panel. Therefore, the number of film layers that the light emitted by the fourth light-emitting layer 32 needs to pass through is smaller, resulting in less light loss. Thus, there is no need to make the size of the fourth light-emitting layer 32 too large. Therefore, in this embodiment, the size of the fourth light-emitting layer 32 is appropriately reduced so that its orthographic projection on the substrate 1 is smaller than the orthographic projection size of the third light-emitting layer 31 on the substrate 1.

[0101] In some embodiments, please refer to Figure 1 , Figure 8 as well as Figure 9 The transmittance of the first display area A1 is greater than that of the second display area A2. The first light-emitting unit 2, comprising m light-emitting layers, also includes a fifth light-emitting layer 23. At least a portion of the first light-emitting units 2 have the following light emission colors: the first light-emitting layer 21 emits red light, the second light-emitting layer 22 emits green light, and the fifth light-emitting layer 23 emits blue light. The projected area of ​​the fifth light-emitting layer 23 onto the substrate 1 is greater than that of the first light-emitting layer 21 onto the substrate 1, and the projected area of ​​the first light-emitting layer 21 onto the substrate 1 is greater than that of the second light-emitting layer 22 onto the substrate 1.

[0102] The first display area A1 is a photosensitive area. The first light-emitting unit 2 within the first display area A1 includes multiple light-emitting layers that emit red, green, and blue light. Under the mixed emission of these multiple light-emitting layers, the first light-emitting unit 2 can emit white light. In the prior art, if a specific light-emitting unit is to emit white light, that unit needs to be set as a white sub-pixel. However, in this embodiment, it is not necessary to set a white light-emitting layer in the first light-emitting unit 2; simply using common red, blue, and green light-emitting layers stacked together, allowing them to mix and emit light, will produce a white light emission effect.

[0103] Furthermore, in this embodiment, by adjusting the sizes of the first light-emitting layer 21, the second light-emitting layer 22, and the fifth light-emitting layer 23, the chromaticity of the white light emitted by the first light-emitting unit 2 can be adjusted. Compared with the prior art, this results in a more accurate display effect and improves the fidelity of the displayed image.

[0104] It should be noted that, in addition to light-emitting units that emit red, green, blue, and white light, the first display area A1 may also include light-emitting units of other colors. For example, the display panel may include light-emitting units that emit yellow light, which internally include multiple light-emitting layers that emit red and green light.

[0105] In some embodiments, please refer to Figure 1 , Figure 10 as well as Figure 11The display panel also includes a third light-emitting unit 6 located within the second display area A2. The third light-emitting unit 6 includes i light-emitting layers, where i is an integer greater than or equal to 1, and i ≤ n. The structure of the second light-emitting unit 3 in this embodiment is as follows: Figure 7 The structures shown are the same.

[0106] Both the second light-emitting unit 3 and the third light-emitting unit 6 are located within the second display area A2. The first display area A1 also contains light-emitting units with the same emitting color as the third light-emitting unit 6. The structure of the third light-emitting unit 6 is similar to that of the second light-emitting unit 3, but the number of light-emitting layers in the third light-emitting unit 6 is less than that in the second light-emitting unit 3. For example, the second light-emitting unit 3 includes a third light-emitting layer 31 and a fourth light-emitting layer 32, and the third light-emitting unit 6 includes a sixth light-emitting layer 61. A hole transport layer 93 and other film layers are disposed between the anode 92 and the third light-emitting layer 31.

[0107] For light-emitting units of different colors, their lifespans vary. Some light-emitting units are relatively prone to aging and yellowing, resulting in color deviation. Other light-emitting units have longer lifespans and are less prone to color deviation. To address the different characteristics of various types of light-emitting units, this embodiment of the application reduces the number of light-emitting layers in the third light-emitting unit 6 within the second display area A2 to that of other light-emitting units, thereby indirectly compensating for the light-emitting units of the same color within the first display area A1.

[0108] It should be noted that in the embodiments of this application, the number i of light-emitting layers in the third light-emitting unit 6 can be less than the number m of light-emitting layers in the first light-emitting unit 2, i can be equal to m, or even i can be greater than m. The embodiments of this application do not impose any restrictions on this.

[0109] In some embodiments, the third light-emitting unit 6 is used to emit blue light. Compared to light-emitting units of other colors, blue light-emitting units typically have a shorter lifespan, thus making them prone to color shift issues. For example, when the first display area A1 is a photosensitive area, by reducing the number of light-emitting layers in the blue light-emitting units within the second display area A2, the uniformity of the blue light emitted by the first display area A1 and the second display area A2 can be ensured, thus compensating for the blue light-emitting units in the photosensitive area.

[0110] In some embodiments, such as Figure 4 As shown, the second light-emitting layer 22 is located on the side of the first light-emitting layer 21 away from the substrate 1, and the orthogonal projection of the first light-emitting layer 21 onto the substrate 1 covers the second light-emitting layer 22.

[0111] As can be seen from the foregoing, in order to improve the brightness uniformity of the first display area A1 and the second display area A2, the light-emitting layer in the first light-emitting unit 2 is provided with multiple layers. That is, a second light-emitting layer 22 is added on the basis of the original first light-emitting layer 21 to provide more light-emitting layers.

[0112] To avoid the impact of the additional light-emitting layer on the transmittance of the first display area A1, this embodiment of the application covers the second light-emitting layer 22 with the orthogonal projection of the first light-emitting layer 21 onto the substrate 1, that is, the orthogonal projection of the second light-emitting layer 22 onto the substrate 1 is located within the first light-emitting layer 21. This design can increase the brightness of the first light-emitting unit 2 while reducing the impact on the transmittance of the first display area A1.

[0113] In some embodiments, such as Figure 4 and Figure 7 As shown, the first light-emitting unit 2 further includes a first connecting layer 24 disposed between adjacent light-emitting layers, and the second light-emitting unit 3 further includes a second connecting layer 33 disposed between adjacent light-emitting layers. The first connecting layer 24 includes a first doped layer 241 and a second doped layer 242 stacked together, and the first doped layer 241 and the second doped layer 242 are respectively used to transfer holes or electrons to two adjacent light-emitting layers in the first light-emitting unit 2.

[0114] The second connecting layer 33 includes a third doped layer 331 and a fourth doped layer 332 stacked together. The third doped layer 331 and the fourth doped layer 332 are used to transfer holes or electrons to two adjacent light-emitting layers in the second light-emitting unit 3, respectively.

[0115] The first connecting layer 24 is used to connect adjacent light-emitting layers in the first light-emitting unit 2 in series, and the second connecting layer 33 is used to connect adjacent light-emitting layers in the second light-emitting unit 3 in series. Specifically, the first connecting layer 24 includes a first doped layer 241 and a second doped layer 242, which are p-type and n-type doped layers, respectively. The p-type doped layer includes materials such as HAT-CN, TCNQ, NDP-9, or combinations thereof, which facilitate hole transport. The n-type doped layer includes materials such as alkali metals, alkaline earth metals, lanthanides, or combinations thereof, which facilitate electron transport.

[0116] The structure of the second connecting layer 33 is similar to that of the first connecting layer 24, and will not be described again in the embodiments of this application.

[0117] It should be noted that, in addition to the first doped layer 241 and the second doped layer 242, the first connecting layer 24 may also include film layers such as hole transport layer and electron transport layer (not shown in the figure). This application embodiment does not limit this, and the second connecting layer 33 is similar.

[0118] In some embodiments, please refer to Figure 12 and Figure 13 At least one of the third doped layer 331 and the fourth doped layer 332 in the second connecting layer 33 has a through hole 333 extending through the thickness direction X, and the orthographic projection of the through hole 333 onto the substrate at least partially overlaps with the orthographic projection of the adjacent light-emitting layer onto the substrate.

[0119] The third doped layer 331 and the fourth doped layer 332 are used to transfer holes or electrons to two adjacent light-emitting layers in the second light-emitting unit 3, respectively. When one of the third doped layer 331 and the fourth doped layer 332 has a via 333, it will cause the light-emitting brightness of the light-emitting layer adjacent to it to decrease or even fail to emit light.

[0120] For example, such as Figure 12 As shown, the second light-emitting unit 3 includes three light-emitting layers: a third light-emitting layer 31, a fourth light-emitting layer 32, and a seventh light-emitting layer 34. A via 333 is located on the third doped layer 331 in the second connecting layer 33 between the third light-emitting layer 31 and the fourth light-emitting layer 32. Due to the presence of the via 333, the number of holes transported to the fourth light-emitting layer 32 is reduced, resulting in a decrease in the brightness of the fourth light-emitting layer 34 or even its inability to emit light.

[0121] Specifically, when a via 333 is provided on the third doped layer 331, there will be an overlap between the orthographic projection of the via 333 onto the substrate 1 and the orthographic projection of the fourth light-emitting layer 32 onto the substrate 1. The portion of the fourth light-emitting layer 32 corresponding to this overlap cannot achieve hole transport with the third doped layer 331. Therefore, the number of holes transported between the fourth light-emitting layer 32 and the third doped layer 331 is reduced, resulting in a decrease in the luminous brightness of the fourth light-emitting layer 32. Optionally, the orthographic projection of the via 333 onto the substrate may cover the orthographic projection of the fourth light-emitting layer 32 onto the substrate. This design prevents the fourth light-emitting layer 32 from emitting light.

[0122] It should be noted that the third doped layer 331 and the fourth doped layer 332 in the second connecting layer 33 are common film layers, and multiple second light-emitting units 3 can share the same third doped layer 331 and fourth doped layer 332. When a via 333 exists in the third doped layer 331, holes can still diffuse and propagate in other areas of the third doped layer 331 except for the via 333. Therefore, the existence of the via 333 only affects a specific light-emitting layer in a specific second light-emitting unit 3, while the other light-emitting layers of that second light-emitting unit 3 and other second light-emitting units 3 are not affected.

[0123] In some embodiments, please refer to Figure 1 as well as Figures 14 to 16 The display surface also includes a first barrier post 71 disposed on the outer periphery of the first light-emitting unit 2, and a second barrier post 72 disposed on the outer periphery of the second light-emitting unit 3.

[0124] The first barrier post 71 and the second barrier post 72 respectively serve to support and protect the first light-emitting unit 2 and the second light-emitting unit 3. Optionally, there are multiple first barrier posts 71 and multiple second barrier posts 72, with multiple first barrier posts 71 surrounding the outer periphery of the first light-emitting unit 2 and multiple second barrier posts 72 surrounding the outer periphery of the second light-emitting unit 3. In some embodiments, the number of first barrier posts 71 is less than the number of second barrier posts 72.

[0125] Normally, the presence of the first blocking pillar 71 and the second blocking pillar 72 increases the cathode resistance value of the light-emitting unit, and the more first blocking pillars 71 and the more second blocking pillars 72 there are, the greater their impact on the cathode resistance. Based on this, the embodiments of this application set the number of first blocking pillars 71 to be less than the number of second blocking pillars 72, so that the cathode resistance corresponding to the first light-emitting unit 2 is smaller than the cathode resistance corresponding to the second light-emitting unit 3, thereby making the light emission brightness of the first light-emitting unit 2 stronger, and thus improving the brightness uniformity of the first display area A1 and the second display area A2.

[0126] For example, such as Figure 14 As shown, a first blocking post 71 is disposed outside a single first light-emitting unit 2, and the first blocking post 71 can be disposed near any edge of the first light-emitting unit 2. Figure 15 As shown, two second blocking pillars 72 are disposed outside a single second light-emitting unit 3, and the two second blocking pillars 72 are distributed on two adjacent sides of the second light-emitting unit 3. In some other embodiments, the two second blocking pillars 72 may also be symmetrically distributed on both sides of the second light-emitting unit 3, or the number of second blocking pillars 72 may be three or more, and this application embodiment does not limit this.

[0127] In some embodiments, the orthogonal projection length L3 of the first barrier post 71 on the substrate is less than the orthogonal projection length L4 of the second barrier post 72 on the substrate.

[0128] As can be seen from the foregoing, the presence of the first barrier post 71 and the second barrier post 72 increases the cathode resistance value of the light-emitting unit. Furthermore, the larger the orthographic projection length of the first barrier post 71 and the second barrier post 72, the greater their influence on the cathode resistance, resulting in lower luminous brightness under the same conditions.

[0129] Therefore, in this embodiment, the orthogonal projection length L3 of the first barrier post 71 on the substrate is set to be less than the orthogonal projection length L4 of the second barrier post 72 on the substrate, so that the cathode resistance corresponding to the first light-emitting unit 2 is smaller than the cathode resistance corresponding to the second light-emitting unit 3, thereby making the light emission brightness of the first light-emitting unit 2 stronger, and thus improving the brightness uniformity of the first display area A1 and the second display area A2.

[0130] In addition, the width of the first barrier post 71 projected onto the substrate can be smaller than the width of the second barrier post 72 projected onto the substrate, thereby making the area of ​​the first barrier post 71 projected onto the substrate smaller than the area of ​​the second barrier post 72 projected onto the substrate, thus reducing the influence of the first barrier post 71 on the cathode resistance.

[0131] In some embodiments, at least a portion of the light-emitting layer in the first light-emitting unit 2 is disposed in the same layer as at least a portion of the light-emitting layer in the second light-emitting unit 3.

[0132] Both the first light-emitting unit 2 and the second light-emitting unit 3 can be structures with multiple light-emitting layers, and the positions of the light-emitting layers typically correspond to the positions of the first light-emitting unit 2 or the second light-emitting unit 3. To improve the manufacturing efficiency of the display panel, in this embodiment, at least a portion of the light-emitting layers in the first light-emitting unit 2 and at least a portion of the light-emitting layers in the second light-emitting unit 3 are disposed in the same layer, allowing at least a portion of the light-emitting layers in the first light-emitting unit 2 and at least a portion of the light-emitting layers in the second light-emitting unit 3 to be formed in the same vapor deposition process, simplifying the manufacturing process and improving manufacturing efficiency.

[0133] Secondly, please refer to Figure 17 This application provides a display device, including the display panel in any of the foregoing embodiments.

[0134] It should be noted that the display device provided in this application embodiment has the beneficial effects of the display panel in any of the foregoing embodiments. For details regarding the beneficial effects of the display device, please refer to the foregoing description of the display panel; further details will not be repeated in this application embodiment.

[0135] While the embodiments disclosed in this application are as described above, the content is merely for the purpose of facilitating understanding of this application and is not intended to limit the invention. Any person skilled in the art to which this application pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed in this application; however, the scope of protection of this application shall still be determined by the scope defined in the appended claims.

[0136] The above description is merely a specific embodiment of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, substitutions for other connection methods described above can be made by referring to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A display panel, characterized in that, It includes a first display area and a second display area, wherein the transmittance of the first display area is greater than that of the second display area; Substrate; A first light-emitting unit is disposed on one side of the substrate within the first display area. The first light-emitting unit includes m light-emitting layers, where m is an integer greater than or equal to 2. The m light-emitting layers include a first light-emitting layer and a second light-emitting layer. The orthographic projection of the first light-emitting layer on the substrate and the orthographic projection of the second light-emitting layer on the substrate at least partially overlap. The second light-emitting unit is disposed on one side of the substrate within the second display area. The second light-emitting unit includes n light-emitting layers, where n is an integer greater than or equal to 1. Wherein, the effective light-emitting area of ​​the first light-emitting unit is different from that of the second light-emitting unit. The effective light-emitting area is the orthogonal projection area of ​​the first light-emitting unit or the second light-emitting unit on the substrate, or the effective light-emitting area is the sum of the orthogonal projection areas of each light-emitting layer in the first light-emitting unit or the second light-emitting unit on the substrate; the density of the first light-emitting unit is less than the density of the second light-emitting unit, or the size of the first light-emitting unit is less than the size of the second light-emitting unit. The display panel further includes a pixel definition layer disposed on one side of the substrate. The pixel definition layer is made of transparent material and includes a first opening extending through the thickness direction of the substrate. At least a portion of the first light-emitting unit is located within the first opening. At least a portion of the first light-emitting layer is located outside the first opening, and the second light-emitting layer is located within the first opening. At least a portion of the orthographic projection of the first light-emitting layer onto the substrate does not overlap with the orthographic projection of the second light-emitting layer onto the substrate.

2. The display panel according to claim 1, characterized in that, The number of light-emitting layers m in the first light-emitting unit and the number of light-emitting layers n in the second light-emitting unit satisfy the relationship: m > n.

3. The display panel according to claim 2, characterized in that, The transmittance of the first display area is greater than that of the second display area. The first light-emitting unit and the second light-emitting unit emit the same color. In the first display area, the minimum distance between two adjacent first light-emitting units is D1. In the second display area, the minimum distance between two adjacent second light-emitting units is D2. Where D1-D2>0.

4. The display panel according to claim 2, characterized in that, The projected area of ​​the first light-emitting unit on the substrate is smaller than the projected area of ​​the second light-emitting unit on the substrate.

5. The display panel according to claim 4, characterized in that, The sum of the projected areas of the light-emitting regions of each light-emitting layer in the first light-emitting unit onto the substrate is greater than the sum of the projected areas of the light-emitting regions of each light-emitting layer in the second light-emitting unit onto the substrate.

6. The display panel according to claim 2, characterized in that, The projected area of ​​the first light-emitting unit on the substrate is not less than the projected area of ​​the second light-emitting unit on the substrate; The density of the first light-emitting unit in the first display area is less than the density of the second light-emitting unit in the second display area.

7. The display panel according to claim 1, characterized in that, n is an integer greater than or equal to 2, and the n light-emitting layers include a third light-emitting layer and a fourth light-emitting layer. The orthographic projection of the third light-emitting layer on the substrate and the orthographic projection of the fourth light-emitting layer on the substrate at least partially overlap, and the orthographic projection area of ​​the third light-emitting layer on the substrate is greater than the orthographic projection area of ​​the fourth light-emitting layer on the substrate.

8. The display panel according to claim 7, characterized in that, The fourth light-emitting layer is located on the side of the third light-emitting layer that is away from the substrate.

9. The display panel according to claim 1, characterized in that, The transmittance of the first display area is greater than that of the second display area. The m light-emitting layers further include a fifth light-emitting layer. At least the first light-emitting layer in the first light-emitting unit emits red light, the second light-emitting layer emits green light, and the fifth light-emitting layer emits blue light. Wherein, the projected area of ​​the fifth light-emitting layer on the substrate is greater than the projected area of ​​the first light-emitting layer on the substrate, and the projected area of ​​the first light-emitting layer on the substrate is greater than the projected area of ​​the second light-emitting layer on the substrate.

10. The display panel according to claim 1, characterized in that, It also includes a third light-emitting unit located in the second display area, the third light-emitting unit comprising i light-emitting layers, where i is an integer greater than or equal to 1; Where i ≤ n.

11. The display panel according to claim 10, characterized in that, The third light-emitting unit is used to emit blue light.

12. The display panel according to claim 1, characterized in that, The second light-emitting layer is located on the side of the first light-emitting layer that is away from the substrate, and the first light-emitting layer is projected onto the substrate to cover the second light-emitting layer.

13. The display panel according to claim 1, characterized in that, The first light-emitting unit further includes a first connecting layer disposed between adjacent light-emitting layers, and the second light-emitting unit further includes a second connecting layer disposed between adjacent light-emitting layers; The first connecting layer includes a first doped layer and a second doped layer stacked together. The first doped layer and the second doped layer are respectively used to transport holes or electrons to two adjacent light-emitting layers in the first light-emitting unit. The second connecting layer includes a third doped layer and a fourth doped layer stacked together. The third doped layer and the fourth doped layer are respectively used to transport holes or electrons to two adjacent light-emitting layers in the second light-emitting unit.

14. The display panel according to claim 13, characterized in that, At least one of the third doped layer and the fourth doped layer in at least a portion of the second interconnect layer has a through-hole extending along the thickness direction of the substrate, and the orthographic projection of the through-hole onto the substrate at least partially overlaps with the orthographic projection of the adjacent light-emitting layer onto the substrate.

15. The display panel according to claim 1, characterized in that, It also includes a first barrier post disposed on the outer periphery of the first light-emitting unit and a second barrier post disposed on the outer periphery of the second light-emitting unit.

16. The display panel according to claim 15, characterized in that, The number of the first barrier columns is less than the number of the second barrier columns; and / or, The projected length of the first barrier post on the substrate is less than the projected length of the second barrier post on the substrate.

17. The display panel according to claim 1, characterized in that, At least a portion of the light-emitting layer in the first light-emitting unit is disposed in the same layer as at least a portion of the light-emitting layer in the second light-emitting unit.

18. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 17.

Images