Sub-pixel structure, pixel arrangement structure, mask, display panel and device

Abstract

Embodiments of the present application relate to a sub-pixel structure, a pixel arrangement structure, a mask plate, a display panel and a device. The sub-pixel structure includes an anode layer, a light-emitting material layer and a cathode layer which are stacked. At least one of the anode layer, the light-emitting material layer and the cathode layer is a first target layer. The first target layer is provided with a central region and at least two radiation regions connected to the central region. Among them, there is a depression region between any two adjacent radiation regions. In the embodiments of the present application, by setting the outwardly protruding radiation regions, on the premise of the same light-emitting area, the perimeter of the outer contour of the sub-pixel can be enlarged, thereby expanding the heat dissipation area of the sub-pixel, improving the heat dissipation ability of the sub-pixel, and further extending the service life of the display device.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of display technologies, and in particular, to sub-pixel structures, pixel arrangement structures, photomasks, display panels, and devices. Background Art

[0002] With the continuous development of display technologies, people have put forward higher requirements for the display brightness of display devices. And usually, the display brightness is increased by increasing the driving current. However, at the device level, the increase in current density will accumulate a large amount of heat in the light-emitting device and cause the aging of the light-emitting device to accelerate, which greatly affects the service life of the display device. Summary of the Invention

[0003] Embodiments of the present application provide a sub-pixel structure, a pixel arrangement structure, a photomask, a display panel, and a device, which can optimize the heat dissipation performance, thereby improving the service life of the display device.

[0004] A sub-pixel structure includes an anode layer, a light-emitting material layer, and a cathode layer that are stacked. At least one of the anode layer, the light-emitting material layer, and the cathode layer is a first target layer. The first target layer is provided with a central region and at least two radiation regions connected to the central region. Among them, there is a depression region between any two adjacent radiation regions.

[0005] A pixel arrangement structure includes a plurality of sub-pixels, and the sub-pixels adopt the sub-pixel structure as described above.

[0006] A photomask is used to fabricate the pixel arrangement structure as described above. The photomask is provided with a plurality of openings, and the plurality of openings are respectively used to form the plurality of sub-pixels in one-to-one correspondence.

[0007] A display panel includes a first display area and a second display area. Among them, the pixel size of the first display area is smaller than that of the second display area, and the first display area adopts the pixel arrangement structure as described above.

[0008] A display device includes a photosensitive device and the display panel as described above. Among them, the photosensitive device is correspondingly arranged with the first display area of the display panel.

[0009] The above-mentioned sub-pixel structure, pixel arrangement structure, mask, display panel and device. The sub-pixel structure includes an anode layer, a light-emitting material layer and a cathode layer arranged in a stacked manner. At least one of the anode layer, the light-emitting material layer and the cathode layer is a first target layer. The first target layer is provided with a central region and at least two radiation regions connected to the central region. Among them, there is a depression region between any two adjacent radiation regions. In the embodiments of the present application, by setting the radiation regions protruding outward, on the premise of the same light-emitting area, the perimeter of the outer contour of the sub-pixel can be enlarged, thereby expanding the heat dissipation area of the sub-pixel, improving the heat dissipation ability of the sub-pixel, and further extending the service life of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 It is a partial schematic diagram of a display device according to an embodiment;

[0012] Figure 2 It is Figure 1 A cross-sectional schematic diagram of the display device according to the embodiment along the AA' direction;

[0013] Figure 3 It is one of the film layer structure schematic diagrams of a sub-pixel structure according to an embodiment;

[0014] Figure 4 It is Figure 3 A top view schematic diagram of the sub-pixel structure according to the embodiment;

[0015] Figure 5 It is one of the top view schematic diagrams of a sub-pixel structure according to an embodiment;

[0016] Figure 6 It is a second top view schematic diagram of a sub-pixel structure according to an embodiment;

[0017] Figure 7 It is a third top view schematic diagram of a sub-pixel structure according to an embodiment;

[0018] Figure 8 It is a fourth top view schematic diagram of a sub-pixel structure according to an embodiment;

[0019] Figure 9 It is a fifth top view schematic diagram of a sub-pixel structure according to an embodiment;

[0020] Figure 10Schematic diagram II of the film layer structure of the sub-pixel structure of an embodiment;

[0021] Figure 11 Schematic diagram III of the film layer structure of the sub-pixel structure of an embodiment;

[0022] Figure 12 Schematic diagram of the structure of a heat sink of an embodiment;

[0023] Figure 13 Schematic diagram I of the pixel arrangement structure of an embodiment;

[0024] Figure 14 Schematic diagram II of the pixel arrangement structure of an embodiment;

[0025] Figure 15 Schematic diagram of the structure of the first mask of an embodiment;

[0026] Figure 16 Schematic diagram of the structure of the second mask of an embodiment;

[0027] Figure 17 Schematic diagram of the structure of the third mask of an embodiment;

[0028] Figure 18 Schematic diagram of the partial structure of a display panel of an embodiment;

[0029] Figure 19 Cross-sectional schematic diagram of the driving circuit in a display panel of an embodiment.

[0030] Description of component labels:

[0031] Display panel: 10; First display area: 11; Second display area: 12; Photosensitive device: 20; First mask: 31; Second mask: 32; Third mask: 33; Anode layer: 100; Light-emitting material layer: 200; Cathode layer: 300; Central region: 510; Radiation region: 520; Concave region: 530; Middle hole: 500; Heat sink: 600; Support structure: 610; Graphene: 620; Driving circuit: 700; Gate: 701; Source: 702; Drain: 703; Source contact structure: 704; Drain contact structure: 705; Substrate: 711; Buffer layer: 712; Gate insulating layer: 713; Interlayer insulating layer: 714; Planarization layer: 715; Pixel definition layer: 716. Detailed implementation manners

[0032] To facilitate the understanding of the embodiments of the present application, the embodiments of the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the embodiments of the present application are given in the drawings. However, the embodiments of the present application can be implemented in many different forms and are not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the embodiments of the present application more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the embodiments of the present application belong. The terms used in the specification of the embodiments of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0035] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first target layer can be called the second target layer, and similarly, the second target layer can be called the first target layer. Both the first target layer and the second target layer are target layers, but they are not the same target layer.

[0036] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. In the description of the present application, "several" means at least one, such as one, two, etc., unless otherwise specifically defined.

[0037] Figure 1 It is a partial schematic diagram of a display device of an embodiment. Figure 2 For Figure 1Schematic cross-sectional view of the display device of the embodiment along the AA' direction. Among them, the display device may be a smart phone, a tablet computer, a gaming device, an Augmented Reality (AR) device, a notebook, a desktop computing device, a wearable device, etc. For the convenience of understanding, the following takes the display device as a mobile phone as an example. With reference to Figure 1 and Figure 2 , in this embodiment, the display device includes a display panel 10 and a photosensitive device 20.

[0038] Continuing to refer to Figure 2 , the display panel 10 includes an adjacent first display area 11 and a second display area 12. Among them, the shape of the first display area 11 may be circular, rectangular, oval, polygonal, irregularly shaped, etc., and the present invention does not limit this. The shape of the second display area 12 may also be annular, rectangular, etc., and the present invention does not limit this. Among them, the photosensitive device 20 is at least partially disposed corresponding to the first display area 11. Exemplarily, the photosensitive device 20 may be disposed below the first display area 11, and the photosensitive device 20 is used to emit and / or receive optical signals through the first display area 11 of the display panel 10. That is, the first display area 11 is the area above the photosensitive device 20. It should be noted that in the embodiments of the present application, above refers to the direction from the back shell of the display device to the display screen, and below refers to the direction from the display screen to the back shell.

[0039] The photosensitive device 20 realizes the test and control based on optical parameters by receiving light. Among them, the photosensitive device 20 may be a camera, and the photosensitive device 20 may also be an ambient light sensor, an optical distance sensor (for example, an infrared sensor, a laser sensor, a proximity sensor, a distance sensor, an optical distance sensor), a structured light module, a Time of Flight (TOF) lens module, an optical fingerprint sensor, etc.

[0040] For the convenience of description, in the embodiments of the present application, the photosensitive device 20 is taken as an example of a camera for description. It can be understood that the driving circuit is usually formed in a plurality of stacked functional layers, and the above-mentioned plurality of functional layers will reduce the incident light intensity of the camera and even cause diffraction problems in imaging, greatly affecting the imaging quality of the camera. Therefore, for the under-screen camera solution, by reducing the pixel size of the first display area 11, the imaging quality can be effectively improved, thereby improving the user experience.

[0041] Figure 3 One of the schematic diagrams of the film layer structure of the sub-pixel structure of an embodiment, refer to Figure 3, in this embodiment, the sub-pixel structure includes an anode layer 100, a light-emitting material layer 200, and a cathode layer 300 arranged in a stacked manner. Among them, the anode layer 100 and the cathode layer 300 are used to jointly apply a driving voltage or driving current to the light-emitting material layer 200 to jointly control the light-emitting of the light-emitting material layer 200. The sub-pixels in this embodiment can be understood as a light-emitting device, and the light-emitting device can be, but is not limited to, an organic light-emitting diode (OLED) and a quantum dot light-emitting diode (QLED), etc. Among them, each light-emitting device can be an organic light-emitting diode of different colors, such as a red OLED, a green OLED, and a blue OLED, etc. The light-emitting layer materials of the light-emitting devices of different colors are different, so as to realize displays of different colors, enabling the display device to achieve full-color display.

[0042] Figure 4 For Figure 3 a top view schematic diagram of the sub-pixel structure of the embodiment, where the top view schematic diagram refers to a schematic diagram obtained by observing along the direction perpendicular to the display surface of the display device. With reference to Figure 3 and Figure 4 , at least one of the anode layer 100, the light-emitting material layer 200, and the cathode layer 300 is a first target layer, and the first target layer is provided with a central region 510 and at least two radiation regions 520 connected to the central region 510. For example, the number of radiation regions 520 can be three, four, or five, which is not limited in this embodiment. Among them, there is a recessed area 530 between any two adjacent radiation regions 520. Among them, the distance between a point on the overall outer contour formed by the central region 510 and the radiation regions 520 and the center of the central region 510 is defined as the center distance. If within a certain area range of the overall outer contour, there is a changing trend that the center distance first decreases and then increases, then this area range is considered to be a recessed area 530. Taking Figure 4 the embodiment as an example, the area pointed by the arrow is a recessed area 530.

[0043] It should be noted that although Figure 4 the embodiment shows a circular structure as the boundary between the central region 510 and the radiation regions 520, however, the above boundary can be understood as a virtual boundary, that is, in the actual sub-pixel structure, the above boundary does not exist. Moreover, the central region 510 and the radiation regions 520 can be formed simultaneously in the same process.

[0044] It can be understood that the heat generation of the sub-pixel structure in the display device can refer to the following formula (1).

[0045]

[0046] Among them, Q is the heat dissipated by the sub-pixel structure, J is the current density flowing through the sub-pixel structure, A is the light-emitting area of the sub-pixel structure, and k is a constant. According to the above formula, it can be seen that the heat Q dissipated by the sub-pixel structure is proportional to the light-emitting area A and is also 2 proportional to J. Therefore, compared with the light-emitting area, the current density has a greater impact on the heat dissipated by the sub-pixel during light emission. As described above in combination with Figure 1 the description, in order to improve the light-receiving effect of the corresponding area of the photosensitive device 20, sub-pixels with smaller sizes are arranged in the first display area 11, and sub-pixels with larger sizes are arranged in the second display area 12. Therefore, it is necessary to make the sub-pixels in the first display area 11 exhibit a greater light-emitting brightness in order to achieve uniform light emission of the display device. It can be understood that the light-emitting brightness of the sub-pixel is proportional to the current density. Therefore, the heat dissipated by the sub-pixels in the first display area 11 during light emission will be much greater than that of the sub-pixels in the second display area 12, resulting in a faster aging rate of the sub-pixels in the first display area 11.

[0047] Referring to Figure 3 , for the sub-pixel structure, the heat inside the sub-pixel structure can be dissipated from the sidewall to the external environment. Among them, the sidewall refers to the outer wall of the sub-pixel structure perpendicular to the display surface. Moreover, the heat dissipation area of the sidewall can be understood to be proportional to the perimeter of the outer contour of the top view pattern and is also proportional to the thickness of the sub-pixel structure. The thickness refers to the dimension of the sub-pixel structure in the first direction, and the first direction is the stacking direction of the anode layer 100, the light-emitting material layer 200, and the cathode layer 300. That is, it can be considered that the larger the ratio of the perimeter of the outer contour of the sub-pixel structure to the light-emitting area, the better the heat dissipation performance of the sub-pixel structure. Therefore, compared with the sub-pixel structure in the related art, in this embodiment, by providing the outwardly protruding radiation area 520, on the premise of the same light-emitting area, the perimeter of the outer contour of the sub-pixel can be expanded, that is, the heat dissipation area of the sub-pixel is expanded, thereby improving the heat dissipation ability of the sub-pixel and further extending the service life of the display device.

[0048] Among them, the plurality of radiation areas 520 can be evenly arranged around the central area 510. Figure 5 is one of the top view schematic diagrams of the sub-pixel structure of an embodiment. Referring to Figure 5 , five radiation areas 520 are all connected to the central area 510. In addition, the shapes of the plurality of radiation areas 520 can be different. For example, Figure 6 is the second top view schematic diagram of the sub-pixel structure of an embodiment. Referring to Figure 6 , the shapes of two of the radiation areas 520 can be different from those of the other two radiation areas 520. In other embodiments, the shape of the radiation area 520 can also be conical, rectangular, etc. In addition, the sizes of the respective radiation areas 520 are not limited in this embodiment either.Figure 7 The third top view schematic diagram of the sub-pixel structure of an embodiment, with reference to Figure 4 and Figure 7 , even if it also includes four radiation regions 520, the size of each radiation region 520 can be set as needed. Figure 8 The fourth top view schematic diagram of the sub-pixel structure of an embodiment, with reference to Figure 8 , multiple radiation regions 520 can be arranged at intervals from each other, and a depression region 530 is formed at the connection between the radiation region 520 and the central region 510, and the depression region 530 is located between two adjacent radiation regions 520. It should be noted that the number, shape, and size of the radiation region 520 are not specifically limited in this embodiment, and the above Figures 5 to 8 is only used for exemplary illustration and is not used to limit the protection scope of the present application.

[0049] In one embodiment, the orthographic projection of other layers except the first target layer on the virtual plane completely covers the orthographic projection of the first target layer on the virtual plane. Through the above setting method, the light-emitting shape of the sub-pixel structure can correspond to the shape of the first target layer, and moreover, the process difficulty in the preparation process of other layers except the first target layer can also be reduced, thereby improving the preparation yield of the sub-pixel structure.

[0050] Continuing to refer to Figure 3 , in one embodiment, the anode layer 100, the light-emitting material layer 200, and the cathode layer 300 can all be the first target layer, and the orthographic projections of the anode layer 100, the light-emitting material layer 200, and the cathode layer 300 on the virtual plane coincide. Through the above setting method, the anode layer 100, the light-emitting material layer 200, and the cathode layer 300 can be prepared by using a mask plate with the same pattern, thereby reducing the design difficulty of the mask plate.

[0051] In one embodiment, the curvature of any point on the outer contour of the radiation region 520 is less than the curvature threshold. Among them, the curvature threshold can be jointly determined according to the process limit size of the lithography equipment, the size of the sub-pixel structure, etc. It can be understood that if the curvature of a certain point is too large, it is easy to cause optical problems such as diffraction concentration, thereby affecting the photosensitive effect of photosensitive devices such as cameras, and further affecting the imaging effect and the user experience. In this embodiment, by setting an outer contour with a large curvature for the radiation region 520, the above problem of diffraction concentration can be effectively avoided, thereby improving the performance of the photosensitive device. Further, the shape of the radiation region 520 can be, for example, Figures 4 to 8 the petal shape shown in any of the embodiments.

[0052] Figure 9 The fifth top view schematic diagram of the sub-pixel structure of an embodiment, with reference to Figure 9, in this embodiment, the outer contours of adjacent radiation regions 520 are smoothly connected by rounded corners. By providing rounded corners with smooth connections, the connection portions can be in the shape of smooth curves, avoiding excessive curvature at the connection of the outer contours of adjacent radiation regions 520, thereby further suppressing the problem of diffraction concentration and further improving the performance of the photosensitive device.

[0053] In one embodiment, the shape of the central region 510 is circular or elliptical. In this embodiment, by adopting a circular or elliptical central region 510, the distance between the center of the sub-pixel structure and any point on the outer contour can be made similar, thereby avoiding excessive differences in the heat dissipation performance of the sub-pixel structure in different directions and further avoiding the problem of different aging speeds of the sub-pixel structure in different directions. It can be understood that the shape of the central region is not limited to circular or elliptical. In some embodiments, the shape of the central region can also be rectangular, parallelogram, etc.

[0054] Figure 10 Schematic diagram II of the film layer structure of the sub-pixel structure of an embodiment, refer to Figure 10 , in one embodiment, at least one of the anode layer 100, the light-emitting material layer 200, and the cathode layer 300 is a second target layer, and the sub-pixel structure is further provided with a through hole 500 penetrating the second target layer along a first direction, and the first direction is the stacking direction of the anode layer 100, the light-emitting material layer 200, and the cathode layer 300. It should be noted that although in Figure 10 the embodiment, the through hole 500 completely penetrates the anode layer 100, the light-emitting material layer 200, and the cathode layer 300, in some embodiments, the through hole 500 can also penetrate only one or two film layers, for example, only penetrate the light-emitting material layer 200 and the anode layer 100.

[0055] It can be understood that the more film layers the through hole 500 penetrates, the better the heat dissipation effect, but at the same time, it affects the light-emitting performance of the sub-pixel to a certain extent. Similarly, the larger the area of the through hole 500, the better the heat dissipation effect, but at the same time, it also affects the light-emitting performance of the sub-pixel to a certain extent. Therefore, the above parameters can be specifically set according to needs.

[0056] Continue to refer to Figure 10 , in one embodiment, the shapes of the sub-pixel structure and the through hole 500 are both centrosymmetric figures, and the symmetry center of the sub-pixel structure coincides with the symmetry center of the through hole 500 in the first direction. Inside the sub-pixel structure, the center of the sub-pixel is most likely to accumulate heat. Therefore, by arranging the through hole 500 at the center of the sub-pixel structure, the heat dissipation effect of the sub-pixel structure can be improved to a large extent.

[0057] Figure 11FIG. 3 is a schematic diagram of a film layer structure of a sub-pixel structure according to an embodiment. Refer to Figure 11 In one embodiment, the sub-pixel structure further includes a heat sink 600 filled in the middle hole 500, wherein the thermal conductivity of the heat sink 600 is greater than that of the second target layer. In this embodiment, the thermal conductivity of the heat sink 600 is also greater than that of air. Therefore, compared with the middle hole 500 structure, by providing the heat sink 600 with a larger thermal conductivity, the heat dissipation effect of the sub-pixel structure can be further improved.

[0058] Figure 12 FIG. 4 is a schematic diagram of the structure of the heat sink 600 according to an embodiment. Refer to Figure 12 In one embodiment, the heat sink 600 includes a support structure 610 and graphene 620.

[0059] The support structure 610 is filled in the middle hole 500, and the conductivity of the support structure 610 is less than the conductivity threshold. A cavity is provided in the support structure 610, and the graphene 620 is filled in the cavity of the support structure 610. Wherein, the support structure 610 is further used to isolate the graphene 620 from the second target layer. By providing the support structure 610, the conductive graphene 620 can be prevented from contacting each film layer in the sub-pixel structure, thereby avoiding the short-circuit phenomenon of the sub-pixel structure, and improving the stability and reliability of the sub-pixel structure. Among them, the support structure 610 can be made of an insulating material such as SiO2, which is not limited in this embodiment. In addition, although Figure 12 In the embodiment, the overall graphene 620 filled is a cylindrical structure. However, in other embodiments, the graphene 620 can also be uniformly and scattered in the support structure 610 in the form of small particles.

[0060] Furthermore, the thermal conductivity of graphene 620 has directionality, so it can better conduct heat to a set direction. Among them, graphene 620 is a two-dimensional periodic honeycomb lattice structure connected by a network of six-membered rings. Therefore, graphene 620 can be warped into a zero-dimensional fullerene, can also be rolled into a one-dimensional carbon nanotube or stacked into a three-dimensional graphite. The specific form of graphene 620 is not specifically limited in this embodiment, as long as it can achieve good thermal conductivity, it belongs to the protection scope of this embodiment.

[0061] It can be understood that the preparation method of the above-mentioned sub-pixel structure is not specifically limited in the embodiments of the present application, and any preparation method capable of forming the above-mentioned sub-pixel structure belongs to the protection scope of the present application. Exemplarily, the anode layer 100, the light-emitting material layer 200, and the cathode layer 300 can be formed first, then the middle hole 500 is formed, and the heat sink 600 is filled at the position of the middle hole 500.

[0062] The embodiment of the present application also provides a pixel arrangement structure, which includes a plurality of sub-pixels, and the sub-pixels adopt the sub-pixel structure as described above. Specifically, the pixel arrangement structure includes a plurality of pixel units, and each of the pixel units includes a first sub-pixel, a second sub-pixel, and at least one third sub-pixel; wherein, the first sub-pixel, the second sub-pixel, and the third sub-pixel respectively adopt the sub-pixel structure as described above. Among them, the first sub-pixel can be a red sub-pixel, the second sub-pixel can be a blue sub-pixel, and the third sub-pixel can be a green sub-pixel. Based on Figure 4 the sub-pixel structure of the embodiment, the present application provides two pixel arrangement structures for further exemplary description.

[0063] Figure 13 is one of the schematic diagrams of the pixel arrangement structure of an embodiment. Refer to Figure 13 , in this embodiment, each of the pixel units includes a red sub-pixel, a blue sub-pixel, and a green sub-pixel, and the multiple sub-pixels in the same pixel unit are evenly arranged in one direction.

[0064] Figure 14 is the second schematic diagram of the pixel arrangement structure of an embodiment. Refer to Figure 14 , in this embodiment, each of the pixel units includes a red sub-pixel, a blue sub-pixel, and two green sub-pixels. Among them, the two green sub-pixels respectively have centers located at two first vertices of a virtual quadrilateral, and the two first vertices are located on a diagonal of the virtual quadrilateral. The red sub-pixel is separated from the green sub-pixels, and the red sub-pixel has a center located at the second vertex of the virtual quadrilateral. The blue sub-pixel is separated from the green sub-pixels and the red sub-pixel respectively, and the blue sub-pixel has a center located at the third vertex of the virtual quadrilateral, and the second vertex and the third vertex are located on the other diagonal of the virtual quadrilateral.

[0065] The embodiment of the present application also provides a mask for manufacturing the pixel arrangement structure as described above. The mask is provided with a plurality of openings, and the plurality of openings are respectively used to form the plurality of sub-pixels in one-to-one correspondence. Specifically, the mask of this embodiment can be understood as a mask group, that is, it specifically includes a plurality of masks, and the plurality of masks in the mask group are jointly used to prepare the pixel arrangement structure.

[0066] To prepare Figure 13 the pixel arrangement structure shown in the embodiment as an example, the mask of this embodiment includes a first mask 31, a second mask 32, and a third mask 33. Figure 15 is the schematic diagram of the structure of the first mask 31 of an embodiment, Figure 16 is the schematic diagram of the structure of the second mask 32 of an embodiment,Figure 17 Schematic structural diagram of the third mask 33 of an embodiment. With reference to Figure 13 and Figures 15 to 17 , the first mask 31 is provided with a plurality of first openings, and the plurality of first openings respectively correspond to Figure 13 a plurality of blue sub-pixels of the embodiment one by one. The second mask 32 is provided with a plurality of second openings, and the plurality of second openings respectively correspond to Figure 13 a plurality of red sub-pixels of the embodiment one by one. The third mask 33 is provided with a plurality of third openings, and the plurality of third openings respectively correspond to Figure 13 a plurality of green sub-pixels of the embodiment one by one. It should be noted that the area of each opening can be slightly larger than the area of the corresponding sub-pixel, that is, the orthographic projection of each sub-pixel on each mask completely falls within each opening. In the pixel arrangement structure formed by the mask set provided in this embodiment, the shape of each sub-pixel structure is optimized, so that the heat dissipation performance can be improved.

[0067] An embodiment of the present application further provides a display panel. Figure 18 Schematic partial structure diagram of the display panel of an embodiment. With reference to Figure 18 , the display panel 10 includes a first display area 11 and a second display area 12. Among them, the pixel size of the first display area 11 is smaller than the pixel size of the second display area 12, and the first display area 11 adopts the pixel arrangement structure as described above. That is, the second display area 12 can still adopt the pixel arrangement structure in the related art. It can be understood that the preparation difficulty of the special-shaped sub-pixel structure in the first display area 11 is higher than that of the sub-pixel in the related art. Therefore, the above special-shaped sub-pixel structure can be not adopted in the second display area 12. Moreover, the smaller-sized sub-pixel structure adopted in the first display area 11 can effectively reduce the gap between adjacent sub-pixels on the premise of keeping the same pixel density as that of the second display area 12, thereby improving the light receiving effect of the photosensitive device of the display panel 10.

[0068] Figure 19 Schematic cross-sectional view of the driving circuit in the display panel of an embodiment. Figure 19 The cross-sectional direction of Figure 19, in the display panel of this embodiment, it includes a substrate and multiple functional layers formed on the substrate. The substrate may include a polyimide (PI) substrate 711 and a buffer layer 712 arranged alternately in sequence. For example, the substrate includes two polyimide (PI) substrates 711 and two buffer layers 712 arranged alternately in sequence. It can be understood that the substrate may also include a greater number of polyimide (PI) substrates 711 and buffer layers 712. Two gate insulating layers 713 (GI1 layer and GI2 layer), an interlayer insulating layer 714, and a planarization layer 715 are also provided on the substrate, and a driving circuit 700 is formed in the gate insulating layer 713, the interlayer insulating layer 714, and the planarization layer 715. Specifically, the first driving circuit 700 includes a gate 701, a source 702, a drain 703, a source contact structure 704, and a corresponding drain contact structure 705, and the anode layer 100 in the sub-pixel structure is electrically connected to the source 702 through a driving trace L. It can be understood that due to limited layout area, the driving circuit 700 of the sub-pixels in the first display area 11 can be led out to the outside of the first display area 11 through the driving trace L for setting, so as to avoid the light shielding problem of the traces and the driving circuit 700.

[0069] Among them, the driving circuit 700 of this embodiment can be a 7T1C driving circuit. In addition, the driving circuit 700 may also have other numbers of transistors, so as to implement a lightweight display device with a smaller number of transistors, or implement more flexible display functions with a larger number of transistors. For example, it can still be other types of driving circuits such as 3T1C, 6T1C, 6T2C, etc.

[0070] Continue to refer to Figure 18 , in one of the embodiments, the pixel densities of the first display area 11 and the second display area 12 are the same. For example, the pixel densities of the first display area 11 and the second display area 12 can both be 400 ppi, so as to ensure that the display effect in the under-screen camera area is exactly the same as that in the normal screen area. Further, in one of the embodiments, the pixel size of the first display area 11 is 1 / 3 to 2 / 3 of the pixel size of the second display area 12, so as to achieve a better light transmittance and ensure the photosensitive effect of the photosensitive device.

[0071] The embodiment of the present application also provides a display device as Figure 1 shown, including a photosensitive device 20 and the display panel 10 as described above. Among them, the photosensitive device 20 is correspondingly arranged with the first display area 11 of the display panel 10. In this embodiment, by adopting the foregoing sub-pixel structure, the middle hole 500, and the heat dissipation member 600, the heat transfer can be accelerated, so as to reduce the device aging damage caused by heat accumulation, thereby playing a role in improving the lifespan of the under-screen area of the photosensitive device 20.

[0072] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0073] The above-described embodiments merely represent several implementation manners of the embodiments of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application should be subject to the appended claims.

Claims

1. A display panel, characterized in that, The display panel includes a first display area and a second display area. The first display area is used to correspondingly arrange photosensitive devices. The pixel arrangement structure of the first display area includes a plurality of sub-pixels. The sub-pixel structure includes an anode layer, a light-emitting material layer, and a cathode layer stacked. At least one of the anode layer, the light-emitting material layer, and the cathode layer is a first target layer. The first target layer is provided with a central region and at least two radiation regions connected to the central region. Among them, there is a concave region between any two adjacent radiation regions. The curvature of any point on the outer contour of the radiation region is less than the curvature threshold to suppress diffraction of the outer contour.

2. The display panel according to claim 1, characterized in that The positive projection of the other layers except the first target layer on the virtual plane completely covers the positive projection of the first target layer on the virtual plane. The virtual plane is perpendicular to the first direction, and the first direction is the stacking direction of the anode layer, the light-emitting material layer, and the cathode layer.

3. The display panel according to claim 2, wherein The anode layer, the light-emitting material layer, and the cathode layer are all the first target layer, and the positive projections of the anode layer, the light-emitting material layer, and the cathode layer on the virtual plane coincide.

4. The display panel according to claim 1, wherein, At least one of the anode layer, the light-emitting material layer, and the cathode layer is a second target layer. The sub-pixel structure is further provided with a through hole penetrating the second target layer along the first direction. The first direction is the stacking direction of the anode layer, the light-emitting material layer, and the cathode layer.

5. The display panel according to claim 4, wherein The shapes of the sub-pixel structure and the through hole are both centrosymmetric figures, and the symmetry center of the sub-pixel structure coincides with the symmetry center of the through hole in the first direction.

6. The display panel according to claim 4, wherein It further includes a heat dissipation member filled in the through hole. Among them, the thermal conductivity of the heat dissipation member is greater than the thermal conductivity of the second target layer.

7. The display panel according to claim 6, wherein, The heat dissipation member includes: A support structure filled in the through hole, and the conductivity of the support structure is less than the conductivity threshold. There is a cavity in the support structure. Graphene filled in the cavity in the support structure. Among them, the support structure is also used to isolate the graphene and the second target layer.

8. The display panel according to any one of claims 1 to 7, characterized in that, A plurality of the radiation regions are evenly arranged around the central region.

9. The display panel according to any one of claims 1 to 7, characterized in that, The outer contours of adjacent radiation regions are smoothly connected by rounded corners.

10. The display panel according to any one of claims 1 to 7, characterized in that, The shape of the radiation region is petal-shaped.

11. The display panel according to any one of claims 1 to 7, characterized in that, The shape of the central region is circular or elliptical.

12. The display panel according to claim 1, wherein, The pixel size of the first display area is smaller than the pixel size of the second display area.

13. The display panel according to claim 1, wherein, The pixel densities of the first display area and the second display area are the same.

14. The display panel according to claim 1, characterized in that, The pixel size of the first display area is 1 / 3 to 2 / 3 of the pixel size of the second display area.

15. A display device, characterized in that, It includes a photosensitive device and the display panel according to any one of claims 1 to 14. Among them, the photosensitive device is correspondingly arranged with the first display area of the display panel.

16. A photomask, characterized in that, For manufacturing the pixel arrangement structure in the display panel according to any one of claims 1 to 14, the mask plate is provided with a plurality of openings, and the plurality of openings are respectively used to form a plurality of the sub-pixels in one-to-one correspondence.

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