Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel and a preparation method thereof and a display device, and relates to the technical field of display, the display panel is provided with a first display area and a second display area, at least part of the first display area surrounds the second display area, the display panel comprises a substrate, a first electrode layer, a light-emitting layer and a second electrode layer, the first electrode layer is arranged on one side of the substrate, the light-emitting layer is arranged on the side, away from the substrate, of the first electrode layer, the second electrode layer is arranged on the side, away from the substrate, of the light-emitting layer, the second electrode layer is provided with a plurality of light-transmitting openings, and orthographic projections of the light-transmitting openings on the substrate are located in the second display area. The orthographic projection of the light-transmitting opening on the substrate and the orthographic projection of the light-emitting layer on the substrate are arranged at intervals. The display panel provided by the invention is beneficial to improving the use performance of the display device.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and more specifically, relates to a display panel and a preparation method thereof, and a display device. Background Art

[0002] Currently, flat panel display devices have the advantages of high image quality, power saving, small thickness and wide application range, and are widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc.

[0003] However, the performance and process performance of current display devices need to be improved. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a display panel and a method for manufacturing the same, and a display device, so as to improve the performance of the display device.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, the present application provides a display panel having a first display area and a second display area, wherein at least a portion of the first display area surrounds the second display area, and the display panel comprises a substrate, a first electrode layer, a light-emitting layer, and a second electrode layer, wherein the first electrode layer is arranged on one side of the substrate, the light-emitting layer is arranged on a side of the first electrode layer facing away from the substrate, and the second electrode layer is arranged on a side of the light-emitting layer facing away from the substrate, and the second electrode layer is provided with a plurality of light-transmitting openings, the orthographic projections of the light-transmitting openings on the substrate are located in the second display area, and the orthographic projections of the light-transmitting openings on the substrate are spaced apart from the orthographic projections of the light-emitting layer on the substrate.

[0007] Through the above technical solution, the display panel provided by the present application is provided with a light-transmitting opening in the second display area, which can improve the light transmittance of the second display area and improve the diffraction of infrared rays, thereby facilitating the improvement of the accuracy of infrared ranging, thereby facilitating the improvement of the performance of the display device.

[0008] In some embodiments, the display panel provided in the present application also includes a pixel definition layer, the pixel definition layer includes a pixel opening, at least a portion of the light-emitting layer is disposed in the pixel opening, and the minimum distance between the edge of the orthographic projection of the light-transmitting opening on the substrate and the edge of the orthographic projection of the pixel opening on the substrate is d, d ≥ 0.02 mm.

[0009] In some embodiments, in the second display area, the second electrode layer includes a pixel area and a light-transmitting area, the orthographic projection of the light-emitting layer on the substrate is located within the orthographic projection of the pixel area on the substrate, the light-transmitting opening is located in the light-transmitting area, and the pixel area surrounds the light-transmitting area; and / or the pixel density of the second display area is less than the pixel density of the first display area.

[0010] In some embodiments, in the second display area, the light emitting layer includes a plurality of pixel units, and the pixel unit includes a plurality of sub-pixels;

[0011] Wherein, the orthographic projections of at least part of the pixel units on the substrate are arranged around the orthographic projections of the light-transmitting openings on the substrate;

[0012] Alternatively, at least a portion of the orthographic projection of the light-transmitting opening on the substrate is located between the orthographic projections of two adjacent pixel units on the substrate.

[0013] In some embodiments, the display panel provided in the present application also includes a cathode patterned material, which is located on the side of the first electrode layer facing away from the substrate, and the orthographic projection of the cathode patterned material on the substrate coincides with the orthographic projection of the light-transmitting opening on the substrate; and / or, the orthographic projection of the light-transmitting opening on the substrate is in the shape of a rectangle, an L-shape, a cross or a regular polygon.

[0014] Optionally, the shape of the orthographic projection of the light-transmitting opening on the substrate is a rectangle. In the second display area, the light-emitting layer includes a plurality of pixel units, the pixel unit includes a plurality of sub-pixels, and at least one pixel unit is provided on at least one side in the width direction of the orthographic projection of the light-transmitting opening on the substrate.

[0015] In some embodiments, in the second display area, the display panel includes a plurality of pixel islands and a wiring bridge connecting two adjacent pixel islands, the light-emitting layer includes a plurality of pixel units and a plurality of wirings, the pixel unit includes a plurality of sub-pixels, the orthographic projection of the pixel unit on the substrate is located within the orthographic projection of the corresponding pixel island on the substrate, the orthographic projection of the wiring on the substrate is located within the orthographic projection of the corresponding wiring bridge on the substrate, and the wiring connects two adjacent pixel units.

[0016] Optionally, in the second display area, the display panel includes a plurality of gaps, and the wiring is located between two adjacent gaps.

[0017] Optionally, the orthographic projection of the light-transmitting opening on the substrate is located within the orthographic projection of the pixel island on the substrate.

[0018] In a second aspect, the present application provides a method for manufacturing a display panel, including the display panel of any of the above embodiments, the manufacturing method comprising:

[0019] providing a substrate;

[0020] Preparing a first electrode layer and a light-emitting layer on one side of the substrate;

[0021] Evaporating a cathode patterning material in the light-transmitting area, the light-transmitting area is located in the second display area, and the orthographic projection of the light-transmitting area on the substrate is spaced apart from the orthographic projection of the light-emitting layer on the substrate;

[0022] A second electrode layer is prepared, wherein the second electrode layer has a light-transmitting opening, and an orthographic projection of the light-transmitting opening on the substrate overlaps with an orthographic projection of the light-transmitting region on the substrate.

[0023] In some embodiments, in the second display area, the display panel includes a plurality of pixel islands and a wiring bridge connecting two adjacent pixel islands, the light-emitting layer includes a plurality of pixel units and a plurality of wirings, the pixel unit includes a plurality of sub-pixels, the orthographic projection of the pixel unit on the substrate is located within the orthographic projection of the corresponding pixel island on the substrate, the orthographic projection of the wiring on the substrate is located within the orthographic projection of the corresponding wiring bridge on the substrate, and the wiring connects two adjacent pixel units; the second display area includes an island area and a bridge area, the bridge area surrounds the island area, the pixel island is located in the island area, and the wiring bridge is located in the bridge area. After providing the substrate and before preparing the first electrode layer and the light-emitting layer, the preparation method further includes:

[0024] A base, a passivation layer, a buffer layer, an active layer, a gate insulating layer, a first metal layer, a capacitor dielectric layer, a second metal layer and an intermediate dielectric layer are sequentially prepared on one side of the substrate;

[0025] Removing the passivation layer, the buffer layer, the active layer, the gate insulating layer, the first metal layer, the capacitor dielectric layer, the second metal layer and the intermediate dielectric layer in the bridge region;

[0026] sequentially preparing a first flat layer, a third metal layer, and a second flat layer on the substrate in the bridge region;

[0027] The base, the first flat layer, the third metal layer and the second flat layer outside the wiring area of ​​the bridge area are removed, and the orthographic projection of the wiring on the substrate is located in the wiring area.

[0028] In some embodiments, preparing a first electrode layer and a light-emitting layer on one side of a substrate comprises:

[0029] preparing a first electrode layer on one side of the substrate;

[0030] A pixel definition layer is prepared on a side of the first electrode layer facing away from the substrate, wherein the pixel definition layer has a pixel opening;

[0031] At least a portion of the light emitting layer is prepared within the pixel opening.

[0032] In a third aspect, the present application provides a display device, comprising a display panel according to any of the above embodiments, and / or a display panel prepared by a preparation method according to any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 It is a structural schematic diagram of a display device in the related art;

[0035] Figure 1 Figure a is one of the structural schematic diagrams of a display device in the related art;

[0036] Figure 1 FIG. b is a second structural diagram of a display device in the related art;

[0037] Figure 1 Figure c is the third structural diagram of a display device in the related art;

[0038] Figure 1 d is a fourth structural schematic diagram of a display device in the related art;

[0039] Figure 2 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0040] Figure 3 One of the principle schematic diagrams of the under-screen camera of the display device provided in the embodiment of the present application;

[0041] Figure 4 The second schematic diagram of the principle of the under-screen camera of the display device provided in the embodiment of the present application;

[0042] Figure 5 A schematic diagram of the planar structure of a display panel provided in an embodiment of the present application;

[0043] Figure 6 For along Figure 5 The cross-sectional structure diagram along the AA line;

[0044] Figure 7 One of the structural schematic diagrams of the second electrode layer provided in the embodiment of the present application;

[0045] Figure 8 The second structural diagram of the second electrode layer provided in the embodiment of the present application;

[0046] Fig. 9 The third structural diagram of the second electrode layer provided in the embodiment of the present application;

[0047] Fig.10 The fourth structural schematic diagram of the second electrode layer provided in the embodiment of the present application;

[0048] Fig.11 A fifth structural diagram of the second electrode layer provided in an embodiment of the present application;

[0049] Fig.12 The sixth structural diagram of the second electrode layer provided in the embodiment of the present application;

[0050] Fig.13 The seventh structural diagram of the second electrode layer provided in the embodiment of the present application;

[0051] Fig.14 The eighth structural diagram of the second electrode layer provided in the embodiment of the present application;

[0052] Fig.15 A schematic diagram of pixel arrangement in the second display area of ​​the display panel provided in an embodiment of the present application;

[0053] Fig.16 For along Fig.15 The cross-sectional structure diagram of the middle BB line;

[0054] Fig.17 One of the structural schematic diagrams of the display panel provided in the embodiment of the present application during the preparation process;

[0055] Fig.18 The second structural schematic diagram of the display panel during the preparation process provided by the embodiment of the present application;

[0056] Fig.19 The third structural schematic diagram of the display panel during the preparation process provided by the embodiment of the present application;

[0057] Fig. 20 A fourth structural schematic diagram of a display panel during the preparation process provided in an embodiment of the present application;

[0058] Fig.21 A fifth structural schematic diagram of a display panel during the preparation process provided in an embodiment of the present application;

[0059] Fig. 22 This is the sixth structural schematic diagram of the display panel during the preparation process provided in the embodiment of the present application.

[0060] Among them, the reference numerals in the figure are:

[0061] 1000-display device; 100-display panel; 101-first display area; 102-second display area; 10-substrate; 20-first electrode layer; 30-pixel definition layer; 31-pixel opening; 40-light-emitting layer; 41-pixel unit; 50-second electrode layer; 51-light-transmitting opening; 501-cathode patterning material; 60-packaging layer; 71-pixel island; 72-wiring bridge; 73-gap; 81-substrate; 82-passivation layer; 83-buffer layer; 84-gate insulating layer; 85-capacitor dielectric layer; 86-intermediate dielectric layer; 87-second flat layer; 88-first flat layer; 91-active layer; 92-first metal layer; 93-second metal layer; 94-third metal layer; 95-metal barrier layer. DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0064] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0066] In the related art, the display device 1000 has the advantages of high image quality, power saving, small thickness and wide application range, and is widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. However, the performance and process performance of the display device 1000 need to be improved.

[0067] In order to solve the above technical problems, an embodiment of the present application provides a display device 1000 .

[0068] For example, see Figure 1 The display device 1000 may be a mobile phone. With the development of technology, the display screen area of ​​the display device 1000 is gradually increasing. Figure 2 The full-screen display device 1000 is shown.

[0069] Please also read Figure 2 , Figure 3 and Figure 4 In order to achieve a full-screen effect, people have proposed the design of an underdisplay camera (UDC or under screen camera, USC), which is to hide the front camera under the screen of the electronic device. Facial recognition technology has the advantages of no contact, convenience, and strong confidentiality. Compared with the usual two-dimensional imaging recognition method, the more secure three-dimensional facial recognition technology has been widely used in the display field. Facial recognition usually uses infrared light detection technology, that is, the display device collects the user's facial image and depth of field information by projecting an infrared point light source to the user's face, forming a digital facial model, and compares the collected model with the face model stored in the mobile phone to determine whether it is unlocked.

[0070] The display device 1000 provided in the embodiment of the present application includes a display panel 100 , which may be an organic light-emitting diode (OLED) display panel 100 or a micro light-emitting diode (Micro Light Emitting Diode, Micro LED / μLED) display panel 100 .

[0071] The inventors found that the UDC or facial recognition sensing area has a low transmittance (<5%) due to the presence of the top and bottom electrodes of the OLED device of the display panel 100, which makes the infrared signal of facial recognition have a low intensity. In addition, since the width of the metal traces inside the display panel 100 is comparable to the wavelength of infrared rays, the infrared rays will be diffracted when passing through the panel, which reduces the accuracy of infrared ranging.

[0072] To solve the above technical problems, please refer to Figure 5 The embodiment of the present application provides a display panel 100, which has a first display area 101 and a second display area 102, wherein at least a portion of the first display area 101 surrounds the second display area 102. The front camera is disposed in the second display area 102.

[0073] Optionally, the pixel density of the second display area 102 is smaller than the pixel density of the first display area 101 .

[0074] Optionally, the pixel density of the second display area 102 is 0.5 times the pixel density of the first display area 101. For example, the pixel density of the first display area 101 is 270 PPI, and the pixel density of the second display area 102 is 135 PPI.

[0075] Optionally, the second display area 102 is a rectangle, and a size of one of two adjacent sides of the second display area 102 is greater than or equal to 25 mm and less than or equal to 35 mm, and a size of the other side is greater than or equal to 15 mm and less than or equal to 25 mm.

[0076] Optionally, the sizes of two adjacent sides of the second display area 102 are 30 mm and 20 mm respectively.

[0077] See also Figure 6 The display panel 100 provided in the embodiment of the present application includes a substrate 10, a first electrode layer 20, a light-emitting layer 40 and a second electrode layer 50. The first electrode layer 20 is arranged on one side of the substrate 10, the light-emitting layer 40 is arranged on the side of the first electrode layer 20 away from the substrate 10, and the second electrode layer 50 is arranged on the side of the light-emitting layer 40 away from the substrate 10. The second electrode layer 50 is provided with a plurality of light-transmitting openings 51, and the orthographic projection of the light-transmitting openings 51 on the substrate 10 is located in the second display area 102, and the orthographic projection of the light-transmitting openings 51 on the substrate 10 is spaced apart from the orthographic projection of the light-emitting layer 40 on the substrate 10.

[0078] Through the above technical solution, the display panel 100 provided in the embodiment of the present application is provided with a light-transmitting opening 51 in the second display area 102, which can improve the light transmittance of the second display area 102, which is beneficial to improving the infrared signal strength of facial recognition, thereby facilitating the improvement of the performance of the display device 1000. In addition, the light-transmitting opening 51 can improve the diffraction of infrared rays, thereby facilitating the improvement of the accuracy of infrared ranging.

[0079] Optionally, the first electrode layer 20 may be an anode, and the second electrode layer 50 may be a cathode.

[0080] Please continue reading Figure 6 In some embodiments, the display panel 100 provided in the embodiment of the present application further includes a pixel definition layer 30, the pixel definition layer 30 includes a pixel opening 31, at least part of the light emitting layer 40 is disposed in the pixel opening 31, and the minimum distance between the edge of the orthographic projection of the light-transmitting opening 51 on the substrate 10 and the edge of the orthographic projection of the pixel opening 31 on the substrate 10 is d, and d≥0.02mm. In this way, the pixel opening 31 and the light-transmitting opening 51 can be kept at a certain distance, which is conducive to preventing the light-transmitting opening 51 from having an adverse effect on the light-emitting layer 40.

[0081] Optionally, 0.02 mm ≤ d < 0.025 mm. Optionally, 0.025 mm ≤ d < 0.03 mm. Optionally, d ≥ 0.03 mm.

[0082] Optionally, d can be 0.02mm, 0.021mm, 0.022mm, 0.023mm, 0.024mm, 0.025mm, 0.026mm, 0.027mm, 0.028mm, 0.029mm, 0.03mm, etc.

[0083] Please also read Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 In some embodiments, in the second display area 102, the second electrode layer 50 includes a pixel area and a light-transmitting area, the orthographic projection of the light-emitting layer 40 on the substrate 10 is located within the orthographic projection of the pixel area on the substrate 10, the light-transmitting opening 51 is located in the light-transmitting area, and the pixel area surrounds the light-transmitting area.

[0084] Optionally, the orthographic projection of the light-transmitting opening 51 on the substrate 10 overlaps with the orthographic projection of the light-transmitting region on the substrate 10. Optionally, the orthographic projection of the light-transmitting opening 51 on the substrate 10 is located within the orthographic projection of the light-transmitting region on the substrate 10. Optionally, the orthographic projection of the light-transmitting opening 51 on the substrate 10 coincides with the orthographic projection of the light-transmitting region on the substrate 10.

[0085] Optionally, the orthographic projection of the light-emitting layer 40 on the substrate 10 is located within the orthographic projection of the pixel region of the second electrode layer 50 on the substrate 10. Optionally, the orthographic projection area of ​​the pixel region on the substrate 10 is larger than the orthographic projection area of ​​the light-emitting layer 40 on the substrate 10. Optionally, the portion of the second electrode layer 50 outside the light-transmitting region is the pixel region. The surroundings of the light-transmitting region are all pixel regions.

[0086] Please continue reading Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 In some embodiments, in the second display area 102, the light emitting layer 40 includes a plurality of pixel units 41, and the pixel unit 41 includes a plurality of sub-pixels. Optionally, the plurality of sub-pixels may include a first sub-pixel, a second sub-pixel, and a third sub-pixel. Optionally, the first sub-pixel, the second sub-pixel, and the third sub-pixel may emit light of different colors. For example, the first sub-pixel may emit red light, the second sub-pixel may emit green light, and the third sub-pixel may emit blue light.

[0087] Optionally, the orthographic projections of at least part of the pixel units 41 on the substrate 10 are arranged around the orthographic projections of the light-transmitting openings 51 on the substrate 10 .

[0088] Optionally, at least a portion of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is located between the orthographic projections of two adjacent pixel units 41 on the substrate 10 .

[0089] Optionally, see Figure 7 , the shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is L-shaped. At least part of a portion of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is located between the orthographic projections of one pixel unit 41 and another pixel unit 41 on the substrate 10, and at least part of another portion of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is located between the orthographic projections of one pixel unit 41 and another pixel unit 41 on the substrate 10.

[0090] Optionally, see Figure 8 and Fig. 9 The shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a rectangle.

[0091] Optionally, in the second display area 102, the light emitting layer 40 includes a plurality of pixel units 41, the pixel unit 41 includes a plurality of sub-pixels, and the width direction of the orthographic projection of the light-transmitting opening 51 on the substrate 10 (eg Figure 8 At least one pixel unit 41 is provided on at least one side (in the Y direction).

[0092] Optionally, see Figure 8 , the width direction of the orthographic projection of the light-transmitting opening 51 on the substrate 10 (eg Figure 8 A pixel unit 41 is provided on at least one side of the substrate 10 (in the Y direction), and a plurality of light-transmitting openings 51 are provided along the width direction of the orthographic projection of the light-transmitting openings 51 on the substrate 10 (such as Figure 8 The X direction in the image is used to set the spacing.

[0093] Optionally, see Fig. 9 , the width direction of the orthographic projection of the light-transmitting opening 51 on the substrate 10 (eg Fig. 9 At least one side of the light transmission opening 51 (in the Y direction) is provided with a plurality of pixel units 41. This can help increase the area of ​​the light transmission opening 51, and can further help improve the light transmittance.

[0094] Optionally, see Fig.10 , the width direction of the orthographic projection of the light-transmitting opening 51 on the substrate 10 (eg Fig.10 At least one side of the light transmission opening 51 (in the X direction) is provided with a plurality of pixel units 41. This can help increase the area of ​​the light transmission opening 51, and can further help improve the light transmittance.

[0095] Optionally, please also refer to Fig.11 , Fig.12 and Fig.13 The shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a regular polygon.

[0096] For example, see Fig.11 The shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a square.

[0097] For example, see Fig.12 The shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a regular hexagon.

[0098] For example, see Fig.13 The shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a regular octagon.

[0099] Optionally, see Fig.14 The shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a cross.

[0100] It can be understood that the light-transmitting opening 51 can be produced by first using a fine metal mask (FMM) to evaporate the cathode patterning material 501 (Cathode Patterning Material, CPM) before preparing the second electrode layer 50. The location where the CPM material is evaporated will not have cathode material evaporated in the area due to the effect of atomic surface energy. In this way, the cathode is patterned, thereby forming the light-transmitting opening 51, which is beneficial to improve the light transmittance.

[0101] Of course, the light-transmitting opening 51 may also be formed by other methods.

[0102] In addition, by providing the light-transmitting opening 51, the bending and wrinkling during the FMM net stretching process can be effectively reduced, and the infrared diffraction situation can be improved, thereby helping to improve the accuracy of infrared ranging.

[0103] For example, when the light-transmitting opening 51 is a rectangular opening, that is, the shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a rectangle, the FMM bending dimension is greater than or equal to 0.070 mm and less than or equal to 0.80 mm, the FMM wrinkle dimension is greater than or equal to 0.055 mm and less than or equal to 0.065 mm, and the FMM tensile direction shrinkage is greater than or equal to 0.015 mm and less than or equal to 0.025 mm.

[0104] In addition, when the light-transmitting opening 51 is a rectangular opening, the length of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is greater than or equal to 0.1430 mm and less than or equal to 0.1440 mm. Optionally, the width of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is greater than or equal to 0.0820 mm and less than or equal to 0.0.0830 mm. Optionally, the minimum distance between the edge of the orthographic projection of the light-transmitting opening 51 on the substrate 10 and the edge of the orthographic projection of the pixel opening 31 on the substrate 10 is greater than or equal to 0.02 mm. Optionally, the distance between the centers of the orthographic projections of two adjacent light-transmitting openings 51 on the substrate 10 is greater than or equal to 0.1880 mm and less than or equal to 0.1890 mm. Optionally, the distance between the centers of the orthographic projections of two adjacent light-transmitting openings 51 on the substrate 10 is the pitch of the orthographic projection of the light-transmitting opening 51 on the substrate 10.

[0105] For example, when the light-transmitting opening 51 is a regular octagonal opening, that is, the shape of the positive projection of the light-transmitting opening 51 on the substrate 10 is a regular octagon, the FMM bending dimension is greater than or equal to 0.080 mm and less than or equal to 0.090 mm, the FMM wrinkle dimension is greater than or equal to 0.070 mm and less than or equal to 0.080 mm, and the FMM tensile direction shrinkage is greater than or equal to 0.015 mm and less than or equal to 0.025 mm.

[0106] In addition, when the light-transmitting opening 51 is a regular octagonal opening, the side length of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is greater than or equal to 0.03 mm and less than or equal to 0.08 mm, and the angle formed by two adjacent sides is 135°. Optionally, the minimum distance between the side of the orthographic projection of the light-transmitting opening 51 on the substrate 10 and the side of the orthographic projection of the pixel opening 31 on the substrate 10 is greater than or equal to 0.02 mm. Optionally, the distance between the centers of the orthographic projections of two adjacent light-transmitting openings 51 on the substrate 10 is greater than or equal to 0.1880 mm and less than or equal to 0.1990 mm. That is, the pitch of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is greater than or equal to 0.1880 mm and less than or equal to 0.1990 mm.

[0107] It can be understood that when the light-transmitting opening 51 is a rectangular opening or a regular octagonal opening, the FMM bending size and the FMM wrinkle size are both relatively small, and the shrinkage rate of the FMM in the stretching direction is basically the same.

[0108] Optionally, in the case where the light-transmitting opening 51 is a cross-shaped opening, that is, the shape of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is a cross. Optionally, the length of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is greater than or equal to 0.10 mm and less than or equal to 0.20 mm. Optionally, the minimum distance between the edge of the orthographic projection of the light-transmitting opening 51 on the substrate 10 and the edge of the orthographic projection of the pixel opening 31 on the substrate 10 is greater than or equal to 0.02 mm. The distance between the centers of the orthographic projections of two adjacent light-transmitting openings 51 on the substrate 10 is greater than or equal to 0.1880 mm and less than or equal to 0.1990 mm. That is, the pitch of the orthographic projection of the light-transmitting opening 51 on the substrate 10 is greater than or equal to 0.1880 mm and less than or equal to 0.1990 mm.

[0109] Among them, when the light-transmitting opening 51 is a regular octagonal opening, in the second display area 102, the area of ​​the light-transmitting opening 51 accounts for greater than or equal to 22% and less than or equal to 32%, and the area of ​​the light-transmitting opening 51 is calculated as: (area of ​​the light-transmitting opening 51 - area of ​​the metal area) / total area. Optionally, the area without light-transmitting openings 51 accounts for greater than or equal to 25% and less than or equal to 35%, and the area without light-transmitting openings 51 accounts for greater than or equal to 25% and less than or equal to 35%, and the area without light-transmitting openings 51 accounts for greater than or equal to 25% and less than or equal to 35%, and the area without light-transmitting openings 51 accounts for greater than or equal to 37% and less than or equal to 47%, and the area without light-transmitting openings accounts for greater than or equal to 37% and less than or equal to 47%, and the area without light-transmitting openings accounts for greater than or equal to 30% and less than or equal to 40%. Optionally, through the above definition, it can be measured that the light transmittance is greater than or equal to 30% and less than or equal to 40%.

[0110] Reference Figure 8 As shown, when the light-transmitting opening 51 is a rectangular opening, in the second display area 102, the area ratio of the light-transmitting opening 51 is greater than or equal to 23% and less than or equal to 33%, and the area ratio of the light-transmitting opening 51 is calculated as: (area of ​​the light-transmitting opening 51 - area of ​​the metal area) / total area. Optionally, the area ratio of no light-transmitting opening 51 is greater than or equal to 25% and less than or equal to 35%, and the area ratio of no light-transmitting opening 51 is calculated as: (area of ​​no light-transmitting opening 51 - area of ​​the metal area) / total area. Optionally, the opaque area ratio is greater than or equal to 37% and less than or equal to 47%, and the opaque area ratio is calculated as: area of ​​the metal area / total area. Optionally, through the above definition, it can be measured that the light transmittance is greater than or equal to 30% and less than or equal to 40%.

[0111] It can be understood that when the light-transmitting opening 51 is a rectangular opening or a regular octagonal opening, the second display area 102 has good light transmittance.

[0112] In addition, when the light-transmitting opening 51 is a regular octagonal opening, in the point spread function simulation data of 940nm light, the zero-order energy accounts for greater than or equal to 43% and less than or equal to 53%. When the light-transmitting opening 51 is a rectangular opening, in the point spread function simulation data of 940nm light, the zero-order energy accounts for greater than or equal to 42% and less than or equal to 52%.

[0113] It can be understood that when the light-transmitting opening 51 is a rectangular opening or a regular octagonal opening, the second display area 102 has a lower diffraction effect.

[0114] See also Fig.15 In some embodiments, in the second display area 102 , the display panel 100 includes a plurality of pixel islands 71 ​​and a wiring bridge 72 connecting two adjacent pixel islands 71 ​​.

[0115] Optionally, the light-emitting layer 40 includes a plurality of pixel units 41 and a plurality of wirings, the pixel unit 41 includes a plurality of sub-pixels, the orthographic projection of the pixel unit 41 on the substrate 10 is located within the orthographic projection of the corresponding pixel island 71 on the substrate 10, the orthographic projection of the wiring on the substrate 10 is located within the orthographic projection of the corresponding wiring bridge 72 on the substrate 10, and the wiring connects two adjacent pixel units 41.

[0116] It can be understood that connecting two adjacent pixel islands 71 ​​via a wiring bridge 72 can reduce the impact on transmittance, thereby facilitating improvement of light transmittance.

[0117] Optionally, in the second display area 102, the display panel 100 includes a plurality of gaps 73, and the wiring is located between two adjacent gaps 73. Light can pass through the gaps 73, which is beneficial to improve light transmittance.

[0118] Optionally, the gap 73 may be formed by etching.

[0119] See also Fig.16 Optionally, the display panel 100 provided in the embodiment of the present application further includes a substrate 81 , which is disposed on one side of the substrate 10 , and the substrate 81 may be a polyimide (PI) substrate 81 .

[0120] Optionally, the display panel 100 provided in the embodiment of the present application further includes a barrier layer (BL) and a buffer layer 83 (Buffer) located on the side of the base 81 away from the substrate 10, and the materials of the barrier layer and the buffer layer 83 may include inorganic materials. Optionally, the material of the barrier layer may include silicon oxide (SiO) and / or amorphous silicon (a-Si). Optionally, the material of the buffer layer 83 may include silicon oxide and / or silicon nitride.

[0121] Optionally, the display panel 100 provided in the embodiment of the present application further includes an active layer 91 and a gate insulating layer 84 (GI) covering the active layer 91, and the active layer 91 may be an inorganic semiconductor active layer 91 (P-Si).

[0122] Optionally, the display panel 100 provided in the embodiment of the present application further includes a first metal layer 92 (M1) located on the side of the gate insulating layer 84 away from the substrate 10 and a capacitor dielectric layer 85 (CI) covering the first metal layer 92. The material of the first metal layer 92 may include molybdenum (Mo), and the material of the capacitor dielectric layer 85 may include silicon oxide.

[0123] Optionally, the display panel 100 provided in the embodiment of the present application further includes a second metal layer 93 (M2) located on the side of the capacitor dielectric layer 85 facing away from the substrate 10, and an intermediate dielectric layer 86 (ILD) covering the second metal layer 93. The material of the second metal layer 93 may include molybdenum (Mo), and the material of the intermediate dielectric layer 86 may include silicon oxide and / or silicon nitride.

[0124] Optionally, the display panel 100 provided in the embodiment of the present application further includes a third metal layer 94 (M2) located on the side of the intermediate dielectric layer 86 away from the substrate 10 and a second buffer layer 83 (PLN2) covering the second metal layer 93. The material of the third metal layer 94 may include a three-layer structure of titanium (Ti) / aluminum (Al) / titanium (Ti), and the material of the second buffer layer 83 may include an organic material. Optionally, the material of the second buffer layer 83 includes a photosensitive polyimide material.

[0125] Optionally, the first electrode layer 20 is located on a side of the second buffer layer 83 facing away from the substrate 10 , and the pixel definition layer 30 covers at least a portion of the first electrode layer 20 .

[0126] Optionally, the display panel 100 provided in the embodiment of the present application further includes an encapsulation layer 60, which is located on the side of the second electrode layer 50, the pixel definition layer 30 and the intermediate dielectric layer 86 away from the substrate 10. The material of the encapsulation layer 60 may be an inorganic material. Optionally, the material of the encapsulation layer 60 may include silicon oxide and / or silicon nitride. The encapsulation layer 60 may encapsulate the light-emitting layer 40 and the first electrode layer 20 and the second electrode layer 50.

[0127] Optionally, the display panel 100 provided in the embodiment of the present application further includes a metal barrier layer 95, which is located on the side of the intermediate dielectric layer 86 away from the substrate 10, and the orthographic projection of the metal barrier layer 95 on the substrate 10 is spaced apart from the orthographic projection of the pixel definition layer 30 on the substrate 10, and the encapsulation layer 60 covers the metal barrier layer 95. The metal barrier layer 95 can block water and oxygen.

[0128] Please also read Figure 6 , Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 as well as Fig. 22 The embodiment of the present application also provides a method for preparing a display panel 100, which can be used to prepare the display panel 100 of any of the above embodiments, wherein the second display area 102 includes an island area and a bridge area, the bridge area surrounds the island area, the pixel island 71 is located in the island area, and the routing bridge 72 is located in the bridge area.

[0129] The preparation method provided in the embodiment of the present application includes:

[0130] S1, providing a substrate 10.

[0131] S2, see Fig.16 and Fig.17 On one side of the substrate 10, a base 81, a passivation layer 82, a buffer layer 83, an active layer 91, a gate insulating layer 84, a first metal layer 92, a capacitor dielectric layer 85, a second metal layer 93 and an intermediate dielectric layer 86 are sequentially prepared.

[0132] S3, removing the passivation layer 82, the buffer layer 83, the active layer 91, the gate insulating layer 84, the first metal layer 92, the capacitor dielectric layer 85, the second metal layer 93 and the intermediate dielectric layer 86 in the bridge region.

[0133] S4, see Fig.18 , Fig.19 and Fig. 20 , a first planarizing layer 88, a third metal layer 94, and a second planarizing layer 87 are sequentially prepared on the substrate 81 in the bridge region.

[0134] S5, see Fig.21 , the base 81 , the first flat layer 88 , the third metal layer 94 and the second flat layer 87 outside the wiring area of ​​the bridge area are removed, and the orthographic projection of the wiring on the substrate 10 is located in the wiring area, thereby forming a gap 73 .

[0135] S6, see Fig. 22 , a first electrode layer 20 and a light-emitting layer 40 are prepared on one side of the substrate 10 .

[0136] S7 , evaporating a cathode patterning material 501 in the light-transmitting area, the light-transmitting area is located in the second display area 102 , and an orthographic projection of the light-transmitting area on the substrate 10 is spaced apart from an orthographic projection of the light-emitting layer 40 on the substrate 10 .

[0137] S8, see Figure 6, prepare a second electrode layer 50 , the second electrode layer 50 has a light-transmitting opening 51 , and the orthographic projection of the light-transmitting opening 51 on the substrate 10 overlaps with the orthographic projection of the light-transmitting region on the substrate 10 .

[0138] In this way, the preparation method provided in the embodiment of the present application can form the gap 73 and the light-transmitting opening 51 .

[0139] In some embodiments, in step S6, preparing the first electrode layer 20 and the light-emitting layer 40 on one side of the substrate 10 includes:

[0140] S61, preparing a first electrode layer 20 on one side of the substrate 10;

[0141] S62, preparing a pixel definition layer 30 on a side of the first electrode layer 20 facing away from the substrate 10, wherein the pixel definition layer 30 has a pixel opening 31;

[0142] S63 , preparing at least a portion of the light emitting layer 40 in the pixel opening 31 .

[0143] In this way, the preparation method provided in the embodiment of the present application can prepare the light-emitting layer 40.

[0144] Optionally, the preparation method provided in the embodiment of the present application can also prepare the encapsulation layer 60 after preparing the second electrode layer 50 .

[0145] It can be understood that the display device 1000 provided in the embodiment of the present application includes the display panel 100 of any of the above embodiments, and / or the display panel 100 prepared by the preparation method of any of the above embodiments.

[0146] The above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, comprising a first display area and a second display area, wherein at least a portion of the first display area surrounds the second display area, wherein: The display panel comprises: substrate; A first electrode layer is disposed on one side of the substrate; A light-emitting layer is disposed on a side of the first electrode layer away from the substrate; The second electrode layer is arranged on the side of the light-emitting layer away from the substrate. The second electrode layer is provided with a plurality of light-transmitting openings. The orthographic projections of the light-transmitting openings on the substrate are located within the second display area. The orthographic projections of the light-transmitting openings on the substrate are spaced apart from the orthographic projections of the light-emitting layer on the substrate.

2. The display panel according to claim 1, wherein: The display panel also includes a pixel definition layer, which includes a pixel opening. At least a portion of the light-emitting layer is disposed in the pixel opening. The minimum distance between an edge of an orthographic projection of the light-transmitting opening on the substrate and an edge of an orthographic projection of the pixel opening on the substrate is d, and d≥0.02 mm.

3. The display panel according to claim 1, wherein: In the second display area, the second electrode layer includes a pixel area and a light-transmitting area, the orthographic projection of the light-emitting layer on the substrate is located within the orthographic projection of the pixel area on the substrate, the light-transmitting opening is located in the light-transmitting area, and the pixel area surrounds the light-transmitting area.

4. The display panel according to claim 1, wherein: In the second display area, the light emitting layer includes a plurality of pixel units, and the pixel unit includes a plurality of sub-pixels; Wherein, at least part of the orthographic projections of the pixel units on the substrate are arranged around the orthographic projections of the light-transmitting opening on the substrate; Alternatively, at least a portion of the orthographic projection of the light-transmitting opening on the substrate is located between the orthographic projections of two adjacent pixel units on the substrate.

5. The display panel according to claim 1, wherein: The display panel further includes a cathode patterned material, the cathode patterned material is located on a side of the first electrode layer away from the substrate, and the orthographic projection of the cathode patterned material on the substrate coincides with the orthographic projection of the light-transmitting opening on the substrate; and / or the orthographic projection of the light-transmitting opening on the substrate is in the shape of a rectangle, an L-shape, a cross or a regular polygon; Preferably, the shape of the orthographic projection of the light-transmitting opening on the substrate is a rectangle, and in the second display area, the light-emitting layer includes a plurality of pixel units, each of which includes a plurality of sub-pixels, and at least one of the pixel units is provided on at least one side in the width direction of the orthographic projection of the light-transmitting opening on the substrate.

6. The display panel according to claim 1, wherein: In the second display area, the display panel includes a plurality of pixel islands and a wiring bridge connecting two adjacent pixel islands, the light-emitting layer includes a plurality of pixel units and a plurality of wirings, the pixel unit includes a plurality of sub-pixels, the orthographic projection of the pixel unit on the substrate is located within the orthographic projection of the corresponding pixel island on the substrate, the orthographic projection of the wiring on the substrate is located within the orthographic projection of the corresponding wiring bridge on the substrate, and the wiring connects two adjacent pixel units; Preferably, in the second display area, the display panel includes a plurality of gaps, and the wiring is located between two adjacent gaps; Preferably, an orthographic projection of the light-transmitting opening on the substrate is located within an orthographic projection of the pixel island on the substrate.

7. A method for preparing a display panel, the display panel comprising the display panel according to claim 6, characterized in that: The preparation method comprises: providing a substrate; Preparing a first electrode layer and a light-emitting layer on one side of the substrate; Evaporating a cathode patterning material in a light-transmitting area, wherein the light-transmitting area is located in the second display area, and an orthographic projection of the light-transmitting area on the substrate is spaced apart from an orthographic projection of the light-emitting layer on the substrate; A second electrode layer is prepared, wherein the second electrode layer has a light-transmitting opening, and an orthographic projection of the light-transmitting opening on the substrate overlaps with an orthographic projection of the light-transmitting region on the substrate.

8. The preparation method according to claim 7, characterized in that: In the second display area, the display panel includes a plurality of pixel islands and a wiring bridge connecting two adjacent pixel islands, the light-emitting layer includes a plurality of pixel units and a plurality of wirings, the pixel unit includes a plurality of sub-pixels, the orthographic projection of the pixel unit on the substrate is located within the orthographic projection of the corresponding pixel island on the substrate, the orthographic projection of the wiring on the substrate is located within the orthographic projection of the corresponding wiring bridge on the substrate, and the wiring connects two adjacent pixel units; The second display area includes an island area and a bridge area, the bridge area surrounds the island area, the pixel island is located in the island area, and the wiring bridge is located in the bridge area. After providing the substrate and before preparing the first electrode layer and the light-emitting layer, the preparation method further includes: On one side of the substrate, a base, a passivation layer, a buffer layer, an active layer, a gate insulating layer, a first metal layer, a capacitor dielectric layer, a second metal layer and an intermediate dielectric layer are sequentially prepared; removing the passivation layer, the buffer layer, the active layer, the gate insulating layer, the first metal layer, the capacitor dielectric layer, the second metal layer and the intermediate dielectric layer in the bridge region; sequentially preparing a first flat layer, a third metal layer, and a second flat layer on the substrate in the bridge area; The base, the first flat layer, the third metal layer and the second flat layer except for the wiring area of ​​the bridge area are removed, and the orthographic projection of the wiring on the substrate is located in the wiring area.

9. The preparation method according to claim 7, characterized in that: The orthographic projection of the cathode patterned material on the substrate coincides with the orthographic projection of the light-transmitting opening on the substrate; And / or, the step of preparing a first electrode layer and a light-emitting layer on one side of the substrate comprises: Preparing a first electrode layer on one side of the substrate; A pixel definition layer is prepared on a side of the first electrode layer facing away from the substrate, wherein the pixel definition layer has a pixel opening; At least a portion of the light emitting layer is prepared within the pixel opening.

10. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 6, and / or a display panel prepared by the preparation method as claimed in any one of claims 7 to 9.

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