Display panel and display device

Abstract

A display panel includes a substrate, a display structure layer on the substrate, and a back film on a side of the substrate distal from the display structure layer. The substrate includes a first display area and a second display area on at least one side of the first display area. The display structure layer includes a plurality of first light emitting elements on the first display area, a plurality of second light emitting elements on the second display area, a plurality of first pixel circuits, and a plurality of second pixel circuits. The back film satisfies at least one of: a thickness of the back film in the first display area is greater than a thickness in the second display area; a surface of the back film proximate the substrate is a non-planar surface in the second display area.

Description

TECHNICAL FIELD

[0001] The present document relates to, but is not limited to, the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0002] Organic light emitting diode (OLED) and quantum dot light emitting diode (QLED) are active light emitting display devices, which have the advantages of self-illumination, wide viewing angle, high contrast, low power consumption, extremely high response speed, lightness, flexibility, and low cost. Under-screen camera technology is a new technology proposed to improve the screen ratio of a display device. SUMMARY

[0003] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0004] Embodiments of the present disclosure provide a display panel and a display device.

[0005] In one aspect, the present embodiment provides a display panel, comprising: a substrate, a display structure layer located on the substrate, and a back film located on a side of the substrate away from the display structure layer. The substrate comprises a first display area and a second display area located on at least one side of the first display area. The display structure layer comprises: a plurality of first light emitting elements located in the first display area, a plurality of second light emitting elements located in the second display area, a plurality of first pixel circuits, and a plurality of second pixel units. At least one first light emitting element in the plurality of first light emitting elements is electrically connected to at least one first pixel circuit in the plurality of first pixel circuits, and at least one second light emitting element in the plurality of second light emitting elements is electrically connected to at least one second pixel circuit in the plurality of second pixel circuits. The back film satisfies at least one of the following: the thickness of the back film in the first display area is greater than the thickness of the back film in the second display area; and the surface of the back film close to the substrate is a non-flat surface in the second display area.

[0006] In some example embodiments, the back film comprises: a first back film layer and a second back film layer, the second back film layer being located on a side of the first back film layer away from the substrate; a projection of the first back film layer on the substrate covers a projection of the second back film layer on the substrate, and the second back film layer is located at least in the first display area.

[0007] In some example embodiments, the second back film layer and the first back film layer are connected by a second adhesive layer.

[0008] In some example embodiments, the center of the projection of the second back film layer on the substrate coincides with the center of the first display area.

[0009] In some example embodiments, the second back film layer has an area greater than or equal to an area of the first display region in a projection of the substrate.

[0010] In some example embodiments, the second back film layer has a thickness of 100 micrometers to 300 micrometers.

[0011] In some example embodiments, the second back film layer has a first surface close to the first back film layer, a second surface opposite to the first surface, and a first side surface connecting the first surface and the second surface.

[0012] In some example embodiments, the first side surface is configured to be light-tight.

[0013] In some example embodiments, an included angle between the first side surface of the second back film layer and the first surface of the second back film layer is 45 degrees to 75 degrees.

[0014] In some example embodiments, the display panel further comprises a heat dissipation film layer on a side of the back film away from the substrate, the heat dissipation film layer has no overlap with the second back film layer in a projection of the substrate.

[0015] In some example embodiments, the first side surface of the second back film layer is in direct contact with the heat dissipation film layer.

[0016] In some example embodiments, the first side surface of the second back film layer is a non-flat surface.

[0017] In some example embodiments, the first side surface has a sawtooth or wavy cross section in a direction perpendicular to the display panel.

[0018] In some example embodiments, the first back film layer has a third surface close to the substrate, the third surface is a non-flat surface in the second display region.

[0019] In some example embodiments, the third surface has a sawtooth or wavy cross section in the second display region in a direction perpendicular to the display panel.

[0020] In some example embodiments, the back film and the substrate are connected by a first adhesive layer, the first adhesive layer has a refractive index less than a refractive index of the back film.

[0021] In another aspect, the embodiments provide a display device comprising the display panel as described above.

[0022] In some exemplary embodiments, the display device further includes a sensor located on the non-display side of the display panel, wherein the orthographic projection of the sensor onto the display panel overlaps with a first display area of ​​the display panel.

[0023] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shape and size of one or more components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this disclosure.

[0025] Figure 1 This is a schematic diagram of a display panel;

[0026] Figure 2 This is a partial cross-sectional schematic diagram of a display panel;

[0027] Figure 3 This is a partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure;

[0028] Figure 4 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure;

[0029] Figure 5 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure;

[0030] Figure 6 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure;

[0031] Figure 7A This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure;

[0032] Figure 7B for Figure 7A A magnified view of a portion of the central region C1;

[0033] Figure 8 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure;

[0034] Figure 9 for Figure 8 The diagram shows a comparison of the optical paths of the display panels.

[0035] Figure 10 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure;

[0036] Figure 11 Another partial cross-sectional view of a display panel according to at least one embodiment of the present disclosure;

[0037] Figure 12 Another partial cross-sectional view of a display panel according to at least one embodiment of the present disclosure;

[0038] Figure 13 Another partial cross-sectional view of a display panel according to at least one embodiment of the present disclosure;

[0039] Figure 14 Another partial cross-sectional view of a display panel according to at least one embodiment of the present disclosure;

[0040] Figure 15 A schematic view of a display device according to at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] Embodiments of the present disclosure will be described below with reference to the accompanying drawings. The embodiments can be implemented in various forms. It is readily apparent to those skilled in the art that the embodiments and the features thereof can be changed or replaced without departing from the gist of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the following embodiments. The embodiments in the present disclosure and the features in the embodiments can be combined with each other as long as they are not inconsistent with each other.

[0042] In the drawings, the size, the thickness, or the region of one or a plurality of components may, in some cases, be exaggerated for the purpose of explanation and thus is not necessarily to scale with the actual size, thickness, or region. Therefore, one embodiment of the present disclosure is not necessarily limited by the shape or the number of components illustrated in the drawings. The shapes and the number of components in one embodiment of the present disclosure are merely an example and are not limited to the shapes or the number illustrated in the drawings.

[0043] The ordinal numbers "first", "second", "third", and the like in the present specification are used to avoid confusion among components, and are not intended to indicate the order or the number of the components. The "plurality" in the present disclosure indicates two or more.

[0044] In this specification, terms of "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicating the positional or locational relationship are used to describe the positional relationship of the components with reference to the drawings for the convenience of explanation of the specification and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. The positional relationship of the components is changed as appropriate according to the direction of the components described. Therefore, it is not limited to the words described in the specification, and can be appropriately changed according to the situation.

[0045] In this specification, unless explicitly defined and limited otherwise, the terms "mount", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or connected; it can be directly connected, or indirectly connected through an intermediate, or communication between two elements inside. For those skilled in the art, the meaning of the above terms in the present disclosure can be understood according to the situation.

[0046] In this specification, "electrically connected" includes the case where the components are connected together by an element having a certain electrical effect. The "element having a certain electrical effect" is not particularly limited as long as it can transmit electrical signals between the connected components. Examples of the "element having a certain electrical effect" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, other elements having multiple functions, and the like.

[0047] In this specification, a transistor refers to an element including at least three terminals of a gate, a drain, and a source. The transistor has a channel region between the drain (drain electrode terminal, drain region, or drain electrode) and the source (source electrode terminal, source region, or source electrode), and current can flow through the drain, the channel region, and the source. In this specification, the channel region refers to a region where current mainly flows.

[0048] In this specification, the first pole can be a drain, and the second pole can be a source, or the first pole can be a source, and the second pole can be a drain. In the case of using a transistor with opposite polarity or in the case of changing the direction of current in the circuit operation, the functions of "source" and "drain" are sometimes exchanged with each other. Therefore, in this specification, "source" and "drain" can be exchanged with each other. In addition, the gate can also be referred to as the control pole.

[0049] In this specification, "parallel" refers to the state where the angle formed by two straight lines is greater than or equal to -10° and less than 10°, and therefore also includes the state where the angle is greater than or equal to -5° and less than 5°. Similarly, "perpendicular" refers to the state where the angle formed by two straight lines is greater than or equal to 80° and less than 100°, and therefore also includes the state where the angle is greater than or equal to 85° and less than 95°.

[0050] In this specification, triangles, rectangles, trapezoids, pentagons, or hexagons are not strictly defined; they can be approximate triangles, rectangles, trapezoids, pentagons, or hexagons. Small deformations due to tolerances are possible, as are chamfers, curved edges, and other variations.

[0051] In this disclosure, "light transmittance" refers to the ability of light to pass through a medium, and is the percentage of light flux passing through a transparent or translucent body relative to the incident light flux.

[0052] In this disclosure, "approximately" and "roughly" refer to situations where there are no strict limits and the process and measurement errors are allowed. In this disclosure, "roughly the same" means that the values ​​differ by no more than 10%.

[0053] In this disclosure, “thickness” refers to the distance between the surface of the film away from the substrate and the surface of the film closer to the substrate.

[0054] Figure 1 This is a schematic diagram of a display panel. In some examples, such as... Figure 1 As shown, the display panel may include a display area AA and a peripheral area BB surrounding the display area AA. The display area AA of the display panel may include a first display area A1 and a second display area A2. The second display area A2 may at least partially surround the first display area A1. In this example, the second display area A2 may surround the first display area A1.

[0055] In some examples, such as Figure 1 As shown, the first display area A1 can be a light-transmitting display area, also known as the under-display camera (FDC) area; the second display area A2 can be a normal display area. For example, the orthographic projection of a light sensor (such as a camera) onto the display panel can be located within the first display area A1 of the display panel. In some examples, such as... Figure 1 As shown, the first display area A1 can be circular, and the size of the orthographic projection of the photosensor onto the display panel can be less than or equal to the size of the first display area A1. However, this embodiment is not limited to this. In other examples, the first display area A1 can be rectangular, and the size of the orthographic projection of the photosensor onto the display panel can be less than or equal to the size of the inscribed circle of the first display area A1.

[0056] In some examples, as shown in FIG. 1A, the first display area A1 can be located at the top center of the display area AA. The second display area A2 can surround the first display area A1. However, the present embodiments are not limited thereto. For example, the first display area A1 can be located at the upper left corner or the upper right corner of the display area AA, or other positions. For example, the second display area A2 can surround at least one side of the first display area A1. Figure 1 In some examples, as shown in FIG. 1A, the first display area A1 can be located at the top center of the display area AA. The second display area A2 can surround the first display area A1. However, the present embodiments are not limited thereto. For example, the first display area A1 can be located at the upper left corner or the upper right corner of the display area AA, or other positions. For example, the second display area A2 can surround at least one side of the first display area A1.

[0057] In some examples, as shown in FIG. 1A, the first display area A1 can be located at the top center of the display area AA. The second display area A2 can surround the first display area A1. However, the present embodiments are not limited thereto. For example, the first display area A1 can be located at the upper left corner or the upper right corner of the display area AA, or other positions. For example, the second display area A2 can surround at least one side of the first display area A1. Figure 1 In some examples, as shown in FIG. 1A, the first display area A1 can be located at the top center of the display area AA. The second display area A2 can surround the first display area A1. However, the present embodiments are not limited thereto. For example, the first display area A1 can be located at the upper left corner or the upper right corner of the display area AA, or other positions. For example, the second display area A2 can surround at least one side of the first display area A1.

[0058] In some examples, the display area AA can be provided with a plurality of sub-pixels. At least one sub-pixel can include a pixel circuit and a light emitting element. The pixel circuit can be configured to drive the connected light emitting element. For example, the pixel circuit is configured to provide a driving current to drive the light emitting element to emit light. The pixel circuit can include a plurality of transistors and at least one capacitor, for example, the pixel circuit can be a 3T1C, 4T1C, 5T1C, 5T2C, 6T1C, 7T1C or 8T1C structure. Wherein, T in the above circuit structure refers to a thin film transistor, C refers to a capacitor, and the number before T represents the number of thin film transistors in the circuit, and the number before C represents the number of capacitors in the circuit.

[0059] In some examples, the plurality of transistors in the pixel circuit can be P-type transistors, or can be N-type transistors. Using the same type of transistors in the pixel circuit can simplify the process flow, reduce the process difficulty of the display substrate, and improve the yield of the product. In other examples, the plurality of transistors in the pixel circuit can include P-type transistors and N-type transistors.

[0060] In some examples, the plurality of transistors in the pixel circuit can be low temperature poly-silicon thin film transistors, or can be oxide thin film transistors, or can be low temperature poly-silicon thin film transistors and oxide thin film transistors. The active layer of the low temperature poly-silicon thin film transistor adopts low temperature poly-silicon (LTPS, Low Temperature Poly-Silicon), and the active layer of the oxide thin film transistor adopts oxide semiconductor (Oxide). The low temperature poly-silicon thin film transistor has the advantages of high mobility and fast charging, and the oxide thin film transistor has the advantage of low leakage current. Integrating the low temperature poly-silicon thin film transistor and the oxide thin film transistor on one display substrate, i.e. LTPS+Oxide (abbreviated as LTPO) display substrate, can take advantage of both, can realize low frequency driving, can reduce power consumption, and can improve display quality.

[0061] In some examples, the light-emitting element can be any of the following: a light-emitting diode (LED), an organic light-emitting diode (OLED), a quantum dot light-emitting diode (QLED), or a micro-LED (including mini-LED or micro-LED). For example, the light-emitting element can be an OLED, which can emit red, green, blue, or white light under the drive of its corresponding pixel circuit. The color of the light emitted by the light-emitting element can be determined as needed. In some examples, the light-emitting element may include an anode, a cathode, and an organic light-emitting layer located between the anode and the cathode. The anode of the light-emitting element can be electrically connected to the corresponding pixel circuit. However, this embodiment is not limited in this respect.

[0062] In some examples, a pixel unit of the display area AA may include three sub-pixels, which may be red, green, and blue sub-pixels respectively. However, this embodiment is not limited to this. In some examples, a pixel unit may include four sub-pixels, which may be red, green, blue, and white sub-pixels respectively.

[0063] In some examples, the shape of the light-emitting element can be rectangular, rhomboid, pentagonal, or hexagonal. When a pixel unit includes three sub-pixels, the light-emitting elements of the three sub-pixels can be arranged horizontally side-by-side, vertically side-by-side, or in a triangular arrangement. When a pixel unit includes four sub-pixels, the light-emitting elements of the four sub-pixels can be arranged horizontally side-by-side, vertically side-by-side, or in a square arrangement. However, this embodiment is not limited in this respect.

[0064] Figure 2 This is a partial cross-sectional schematic diagram of a display panel. In some examples, such as... Figure 2As shown, in a direction perpendicular to the display panel, the display panel can include, in sequence, a heat dissipation film layer (SCF) 200, a back film 210, a substrate 100, a display structure layer, an encapsulation structure layer 130, an optical clear adhesive (OCA) layer 140, and a cover plate (CG) 150 (e.g., a glass cover plate). The display structure layer can include, in sequence, a circuit structure layer 110 and a light-emitting structure layer 120 on the substrate 100. In some examples, the circuit structure layer 110 of the first display area A1 can be a stacked composite insulating layer, and the circuit structure layer 110 of the second display area A2 can include a plurality of pixel circuits (e.g., including a plurality of first pixel circuits and a plurality of second pixel circuits). The light-emitting structure layer 120 of the first display area A1 can include a plurality of first light-emitting elements 11. The plurality of first light-emitting elements 11 can be electrically connected to the plurality of first pixel circuits in the second display area A2 through conductive connection lines. The conductive connection lines can be located between the plurality of pixel circuits and the light-emitting structure layer 120. The light-emitting structure layer 120 of the second display area A2 can include a plurality of second light-emitting elements 12. The plurality of second light-emitting elements 12 can be electrically connected to the plurality of second pixel circuits.

[0065] In some examples, as shown, Figure 2 As shown, the circuit structure layer 110 can include at least a semiconductor layer 111 (e.g., which can include an active layer of a plurality of transistors of a plurality of pixel circuits). In some examples, the circuit structure layer 110 of the second display area A2 can include, in sequence, a buffer layer, the semiconductor layer 111, a first gate insulating layer, a first gate metal layer, a second gate insulating layer, a second gate metal layer, an interlayer insulating layer, a first source-drain metal layer, a passivation layer, a first planarization layer, a second source-drain metal layer, a second planarization layer, and at least one transparent conductive layer on the substrate 100. A planarization layer can be disposed between adjacent transparent conductive layers. The at least one transparent conductive layer can include conductive connection lines connecting the first light-emitting elements and the first pixel circuits. For example, the circuit structure layer 110 of the first display area A1 can include at least a stacked buffer layer, a first gate insulating layer, a second gate insulating layer, a third gate insulating layer, an interlayer insulating layer, a passivation layer, a first planarization layer, and a second planarization layer.

[0066] In some examples, the semiconductor layer can include at least an active layer of a plurality of transistors of a plurality of pixel circuits. The first gate metal layer can include at least gate electrodes of the plurality of transistors of the plurality of pixel circuits and one plate of a storage capacitor. The second gate metal layer can include at least another plate of the storage capacitor of the plurality of pixel circuits. The first source-drain metal layer can include at least a first electrode and a second electrode of the transistors of the plurality of pixel circuits. The second source-drain metal layer can include at least a plurality of anode connection electrodes, which can be configured to connect anodes of the light-emitting elements and corresponding pixel circuits.

[0067] In some examples, the buffer layer, the first gate insulating layer, the second gate insulating layer, the interlayer insulating layer, and the passivation layer can be inorganic insulating layers, such as any one or more of silicon oxide (SiOx), silicon nitride (SiNx), and silicon oxynitride (SiON), and can be single-layer, multi-layer, or composite layers. The first planarization layer and the second planarization layer can be organic insulating layers. The first gate metal layer, the second gate metal layer, the first source / drain metal layer, and the second source / drain metal layer can be made of metallic materials, such as any one or more of silver (Ag), copper (Cu), aluminum (Al), titanium (Ti), and molybdenum (Mo), or alloys of the above metals, such as aluminum-neodymium alloy (AlNd) or molybdenum-niobium alloy (MoNb), and can be single-layer structures or multi-layer composite structures, such as Ti / Al / Ti, etc. The semiconductor layer can be made of amorphous indium gallium zinc oxide (a-IGZO), zinc oxynitride (ZnON), indium zinc tin oxide (IZTO), amorphous silicon (a-Si), polycrystalline silicon (p-Si), hexathiophene, or polythiophene, etc. That is, this disclosure applies to transistors manufactured based on oxide technology, silicon technology, or organic technology.

[0068] In some examples, such as Figure 2 As shown, the substrate 100 may include: a first flexible material layer, a first inorganic material layer, a second flexible material layer, and a second inorganic material layer stacked together. The materials of the first flexible material layer and the second flexible material layer may be polyimide (PI), polyethylene terephthalate (PET), or a surface-treated polymer soft film, etc. The materials of the first inorganic material layer and the second inorganic material layer may be silicon nitride (SiNx) or silicon oxide (SiOx), etc., to improve the water and oxygen resistance of the substrate 100.

[0069] In some examples, such as Figure 2 As shown, the light-emitting structure layer 120 may include an anode layer, a pixel definition layer, an organic light-emitting layer, and a cathode layer. The anode layer is disposed on the side of the circuit structure layer away from the substrate 100 and can be electrically connected to the pixel circuitry of the circuit structure layer. The pixel definition layer is disposed on the side of the anode layer away from the substrate 100, and has pixel openings thereon. These pixel openings expose a portion of the anode layer. The organic light-emitting layer is disposed within the pixel openings, and the cathode layer is disposed on the organic light-emitting layer. The organic light-emitting layer emits light of the corresponding color under the influence of a voltage applied to the anode and cathode layers. In some examples, the pixel definition layer may be made of materials such as polyimide, acrylic, or polyethylene terephthalate.

[0070] In some examples, such as Figure 2As shown, the encapsulation structure layer 130 can include inorganic encapsulation layer, organic encapsulation layer and inorganic encapsulation layer in sequence. The organic encapsulation layer is arranged between two inorganic encapsulation layers, which can prevent water vapor from entering the light emitting structure layer 120.

[0071] In some examples, as shown in FIG. 1, the display panel can further include a heat dissipation film layer 200. The heat dissipation film layer 200 can be arranged on the substrate 100 and cover the first display area A1 and the second display area A2. Figure 2 As shown, the heat dissipation film layer 200 can include a conductive heat dissipation layer and a non-conductive heat dissipation layer in sequence. The heat dissipation film layer 200 can not overlap or partially overlap the first display area A1 in the orthographic projection of the substrate 100. The back film 210 and the substrate 100 can be bonded by the first bonding layer 101. The material of the first bonding layer 101 can be pressure sensitive adhesive (PSA). The back film 210 has the same thickness in the first display area A1 and the second display area A2.

[0072] In some implementations, as shown in FIG. 1, the display panel can further include a heat dissipation film layer 200. The heat dissipation film layer 200 can be arranged on the substrate 100 and cover the first display area A1 and the second display area A2. Figure 1 and Figure 2 As shown, the first display area A1 is a light-transmitting area, and the rest of the positions in the first display area A1 can transmit light except the anode layer. Moreover, the anode layer has a flat surface. The light emitted by the first light emitting element in the first display area A1 will reach the interface between the back film 210 and the air after refraction and reflection. At the interface between the back film 210 and the air, the light will be totally reflected, and the totally reflected light will reach the second display area A2 around the first display area A1, causing the positive bias of the partial transistor characteristics in the second display area A2, resulting in the light leakage of the partial sub-pixels in the second display area A2 and causing the corresponding sub-pixels to be dark, forming a progressive dark ring. The closer to the first display area A1, the greater the impact.

[0073] The embodiment provides a display panel, including a substrate, a display structure layer located on the substrate, and a back film located on a side of the substrate away from the display structure layer. The substrate includes a first display area and a second display area located on at least one side of the first display area. The display structure layer includes a plurality of first light emitting elements located in the first display area, a plurality of second light emitting elements located in the second display area, a plurality of first pixel circuits, and a plurality of second pixel units. At least one first light emitting element of the plurality of first light emitting elements is electrically connected to at least one first pixel circuit of the plurality of first pixel circuits, and at least one second light emitting element of the plurality of second light emitting elements is electrically connected to at least one second pixel circuit of the plurality of second pixel circuits. The back film satisfies at least one of the following: the thickness of the back film in the first display area is greater than the thickness of the back film in the second display area; and the surface of the back film close to the substrate is a non-flat surface in the second display area.

[0074] In some examples, the thickness of the back film in the first display area is greater than the thickness of the back film in the second display area; or, the surface of the back film close to the substrate in the second display area is a non-flat surface; or, the thickness of the back film in the first display area is greater than the thickness of the back film in the second display area, and the surface of the back film close to the substrate in the second display area is a non-flat surface.

[0075] In the embodiments of the present disclosure, the non-flat surface refers to that the distances from different positions of a surface to the plane where the substrate is located are different; and the flat surface refers to that the distances from different positions of a surface to the plane where the substrate is located are substantially the same.

[0076] The display panel provided in the embodiments can improve the progressive dark ring defect of the display panel by changing the thickness of the back film in the first display area, or by setting the surface of the back film close to the substrate in the second display area as a non-flat surface.

[0077] In some example embodiments, the back film can include a first back film layer and a second back film layer. The second back film layer can be located on the side of the first back film layer away from the substrate. The first back film layer can cover the second back film layer in the orthographic projection of the substrate, and the second back film layer can be located at least in the first display area. The present example can increase the thickness of the back film in the first display area by additionally providing the second back film layer in the first display area.

[0078] In some example embodiments, the second back film layer can have a first surface close to the first back film layer, a second surface opposite to the first surface, and a first side surface connecting the first surface and the second surface. In some examples, the first side surface can be configured to be opaque. For example, the first side surface can be black. The present example can absorb the light reflected to the first side surface by setting the first side surface to be opaque, reduce the light transmitted to the second display area, and thus improve the progressive dark ring defect. In some examples, the included angle between the first side surface of the second back film layer and the first surface of the second back film layer can be 45 degrees to 75 degrees. In the present example, the light reflected to the first side surface is subjected to total reflection again by setting the included angle between the first side surface and the first surface of the second film layer, the transmission path of the light is changed, the light transmitted to the second display area is reduced, and thus the progressive dark ring defect is improved.

[0079] In some example embodiments, the display panel can further include a heat dissipation film layer. The heat dissipation film layer is located on the side of the back film away from the substrate. The orthographic projection of the heat dissipation film layer on the substrate can not overlap with the orthographic projection of the second back film layer on the substrate. For example, the first side surface of the second back film layer can directly contact the heat dissipation film layer. In the present example, the light reflected to the first side surface can be absorbed by the heat dissipation film layer, the light transmitted to the second display area is reduced, and thus the progressive dark ring defect is improved.

[0080] The schemes of the embodiments will be illustrated below by some examples.

[0081] Figure 3 FIG. 1 is a schematic diagram of a partial cross-section of a display panel according to an embodiment of the present disclosure. In some examples, as shown in FIG. 1, the display panel can include a back film on a side of a substrate 100 away from a display structure layer. The back film can include a first back film layer 310 and a second back film layer 320. The first back film layer 310 can be bonded to a surface of the substrate 100 away from the display structure layer by a first adhesive layer 101. The second back film layer 320 can be fixed to a surface of the first back film layer 310 away from the substrate 100 by a second adhesive layer 301. In some examples, the first adhesive layer 101 and the second adhesive layer 301 can be made of pressure-sensitive adhesive. However, the present embodiment is not limited thereto. Figure 3

[0082] In some examples, as shown in FIG. 2, a projection of the first back film layer 310 on the substrate 100 can cover a projection of the second back film layer 320 on the substrate 100. A center of the projection of the second back film layer 320 on the substrate 100 can coincide with a center of the first display area A1. An area of the projection of the second back film layer 320 on the substrate 100 can be greater than or equal to an area of the first display area A1. A thickness of the second back film layer 320 can be about 100 microns to 300 microns. The projection of the second back film layer 320 on the substrate 100 can not overlap with a projection of the heat dissipation film layer 200 on the substrate 100. There can be a certain distance between the second back film layer 320 and the heat dissipation film layer 200. Figure 3

[0083] In some examples, as shown in FIG. 3, a material of the first back film layer 310 and the second back film layer 320 can be any one of polyethylene terephthalate (PET), polyimide (PI), cyclic olefin polymer (COP), and SRF. Figure 3

[0084] In some examples, as shown in FIG. 4, a refractive index of the first back film layer 310 and the second back film layer 320 can be the same or similar. A refractive index of the first adhesive layer 301 can be the same or similar to the refractive index of the first back film layer 310 and the second back film layer 320. Figure 3

[0085] In some examples, as shown in FIG. 5, a material of the first back film layer 310 and the second back film layer 320 can be any one of polyethylene terephthalate (PET), polyimide (PI), cyclic olefin polymer (COP), and SRF. Figure 3 ​​​​As shown, the cross-section of the second back film layer 302 can be rectangular in the direction perpendicular to the display panel. The second back film layer 320 can have a first surface 3201, a second surface 3202, and a first side surface 3203 connecting the first surface 3201 and the second surface 3202. The first surface 3201 of the second back film layer 320 faces the first back film layer 310, and the second surface 3202 is opposite to the first surface 3201. The first side surface 3203 of the second back film layer 320 can face the heat dissipation film layer 200 and has a certain distance between it and the heat dissipation film layer 200.

[0086] In some examples, such as Figure 3 As shown, the first side 3203 of the second back film layer 320 can be configured to be opaque. For example, a black coating can be applied to the first side 3203, making it black. Light emitted from the first light-emitting element 11 in the first display area A1 is refracted and reflected before reaching the interface between the second back film layer 320 and air. Total internal reflection occurs at the interface between the second surface 3202 of the second back film layer 320 and air. When the totally reflected light reaches the first side 3203 of the second back film layer 320, it can be absorbed by the black coating on the first side 3203 and will not continue to propagate. This reduces the intensity of reflected light received by the active layer of the transistors in the second display area A2 surrounding the first display area A1, thereby improving progressive dark ring defects. Compared to... Figure 2 The display panel shown is Figure 2 The pixel channel reflectance of the second display area of ​​the display panel shown is approximately 2.02%, while the pixel channel reflectance of the second display area of ​​the display panel provided in this example is approximately 1.05%, which can significantly reduce the light received by the transistors in the second display area.

[0087] The remaining structure of the display panel in this embodiment can be found in [reference needed]. Figure 2 As mentioned above, it will not be repeated here.

[0088] Figure 4 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure. In some examples, such as Figure 4As shown, the first back film layer 310 and the second back film layer 320 can be connected by the second adhesive layer 301. The first back film layer 310 can cover the second back film layer 320 in the orthographic projection of the substrate 100. The center of the orthographic projection of the second back film layer 320 on the substrate 100 can coincide with the center of the first display area A1. The area of the orthographic projection of the second back film layer 320 on the substrate 100 can be greater than or equal to the area of the first display area A1. The thickness of the second back film layer 320 can be about 100 microns to 300 microns. The orthographic projection of the second back film layer 320 on the substrate 100 can not overlap with the orthographic projection of the heat dissipation film layer 200 on the substrate 100. There can be a certain distance between the second back film layer 320 and the heat dissipation film layer 200.

[0089] In some examples, as shown in FIG. 1A, the first back film layer 310 and the second back film layer 320 can be connected by the second adhesive layer 301. The first back film layer 310 can cover the second back film layer 320 in the orthographic projection of the substrate 100. The center of the orthographic projection of the second back film layer 320 on the substrate 100 can coincide with the center of the first display area A1. The area of the orthographic projection of the second back film layer 320 on the substrate 100 can be greater than or equal to the area of the first display area A1. The thickness of the second back film layer 320 can be about 100 microns to 300 microns. The orthographic projection of the second back film layer 320 on the substrate 100 can not overlap with the orthographic projection of the heat dissipation film layer 200 on the substrate 100. There can be a certain distance between the second back film layer 320 and the heat dissipation film layer 200. Figure 4 In some examples, as shown in FIG. 1A, the first back film layer 310 and the second back film layer 320 can be connected by the second adhesive layer 301. The first back film layer 310 can cover the second back film layer 320 in the orthographic projection of the substrate 100. The center of the orthographic projection of the second back film layer 320 on the substrate 100 can coincide with the center of the first display area A1. The area of the orthographic projection of the second back film layer 320 on the substrate 100 can be greater than or equal to the area of the first display area A1. The thickness of the second back film layer 320 can be about 100 microns to 300 microns. The orthographic projection of the second back film layer 320 on the substrate 100 can not overlap with the orthographic projection of the heat dissipation film layer 200 on the substrate 100. There can be a certain distance between the second back film layer 320 and the heat dissipation film layer 200.

[0090] Figure 4 In some examples, as shown in FIG. 1A, the first back film layer 310 and the second back film layer 320 can be connected by the second adhesive layer 301. The first back film layer 310 can cover the second back film layer 320 in the orthographic projection of the substrate 100. The center of the orthographic projection of the second back film layer 320 on the substrate 100 can coincide with the center of the first display area A1. The area of the orthographic projection of the second back film layer 320 on the substrate 100 can be greater than or equal to the area of the first display area A1. The thickness of the second back film layer 320 can be about 100 microns to 300 microns. The orthographic projection of the second back film layer 320 on the substrate 100 can not overlap with the orthographic projection of the heat dissipation film layer 200 on the substrate 100. There can be a certain distance between the second back film layer 320 and the heat dissipation film layer 200.

[0091] In some examples, as shown in FIG. 1A, the first back film layer 310 and the second back film layer 320 can be connected by the second adhesive layer 301. The first back film layer 310 can cover the second back film layer 320 in the orthographic projection of the substrate 100. The center of the orthographic projection of the second back film layer 320 on the substrate 100 can coincide with the center of the first display area A1. The area of the orthographic projection of the second back film layer 320 on the substrate 100 can be greater than or equal to the area of the first display area A1. The thickness of the second back film layer 320 can be about 100 microns to 300 microns. The orthographic projection of the second back film layer 320 on the substrate 100 can not overlap with the orthographic projection of the heat dissipation film layer 200 on the substrate 100. There can be a certain distance between the second back film layer 320 and the heat dissipation film layer 200. Figure 4

[0092] Figure 5 In some examples, as shown in FIG. 1A, the first back film layer 310 and the second back film layer 320 can be connected by the second adhesive layer 301. The first back film layer 310 can cover the second back film layer 320 in the orthographic projection of the substrate 100. The center of the orthographic projection of the second back film layer 320 on the substrate 100 can coincide with the center of the first display area A1. The area of the orthographic projection of the second back film layer 320 on the substrate 100 can be greater than or equal to the area of the first display area A1. The thickness of the second back film layer 320 can be about 100 microns to 300 microns. The orthographic projection of the second back film layer 320 on the substrate 100 can not overlap with the orthographic projection of the heat dissipation film layer 200 on the substrate 100. There can be a certain distance between the second back film layer 320 and the heat dissipation film layer 200. Figure 5 ​​As shown, the cross-section of the second back film layer 320 can be trapezoidal in the direction perpendicular to the display panel. The angle α between the first surface 3201 and the first side surface 3203 of the second back film layer 302 can be approximately 45 degrees to 75 degrees, for example, approximately 60 degrees. The first side surface 3203 of the second back film layer 302 can be configured to be opaque, for example, it can be coated with a black coating. After the light emitted from the first light-emitting element 11 in the first display area A1 is refracted and reflected, it reaches the interface between the second back film layer 320 and the air and undergoes total internal reflection at the interface between the second surface 3202 of the second back film layer 320 and the air. When the total internally reflected light reaches the first side surface 3203 of the second back film layer 320, part of the light is directly absorbed by the black coating of the first side surface 3203, and the unabsorbed part of the light will undergo total internal reflection again at the interface between the first side surface 3203 and the air and continue to propagate into the first display area A1, reducing the intensity of reflected light received by the active layer of the transistors in the second display area A2 surrounding the first display area A1, thereby improving the progressive dark ring defect. The remaining structure of the display panel in this embodiment can be referred to the description of the foregoing embodiment, and therefore will not be repeated here.

[0093] Figure 6 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure. In some examples, such as Figure 6 As shown, the first back film layer 310 and the second back film layer 320 can be connected by the second adhesive layer 301. The orthographic projection of the first back film layer 310 onto the substrate 100 can cover the orthographic projection of the second back film layer 320 onto the substrate 100. The center of the orthographic projection of the second back film layer 320 onto the substrate 100 can coincide with the center of the first display area A1. The area of ​​the orthographic projection of the second back film layer 320 onto the substrate 100 can be greater than or equal to the area of ​​the first display area A1. The thickness of the second back film layer 320 can be approximately 100 micrometers to 300 micrometers. The orthographic projection of the second back film layer 320 onto the substrate 100 and the orthographic projection of the heat dissipation film layer 200 onto the substrate 100 can be non-overlapping. By improving the bonding process precision of the heat dissipation film layer 200, it can be ensured that the first side 3203 of the second back film layer 320 is completely bonded to the heat dissipation film layer 200 without air gaps. The first side 3203 of the second back film layer 320 can directly contact the side of the heat dissipation film layer 200.

[0094] In some examples, such as Figure 6As shown, the light emitted from the first light-emitting element 11 in the first display area A1 is refracted and reflected before reaching the interface between the second back film layer 320 and the air. Total internal reflection occurs at the interface between the second surface 3202 of the second back film layer 320 and the air. When the totally reflected light reaches the first side surface 3203 of the second back film layer 320, it can be absorbed by the heat dissipation film layer 200. This reduces the intensity of reflected light received by the active layer of the transistors in the second display area A2 surrounding the first display area A1, thereby improving progressive dark ring defects. The remaining structure of the display panel in this embodiment can be referred to the description of the foregoing embodiments, and therefore will not be repeated here.

[0095] Figure 7A This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure. Figure 7B for Figure 7A A magnified view of a portion of region C1. In some examples, such as... Figure 7A and Figure 7B As shown, the first side surface 3203 of the second back film layer 320 can be a non-planar surface. In a direction perpendicular to the display panel, the first side surface 3203 can have a plurality of first protrusions 3203a. The plurality of first protrusions 3203a can protrude towards the heat dissipation film layer 200. The cross-section of the plurality of first protrusions 3203a can be triangular, resulting in a sawtooth cross-section for the first side surface 3203. For example, the plurality of first protrusions 3203a can be approximately the same size. However, this embodiment is not limited to this. For example, the plurality of first protrusions 3203a can be different sizes.

[0096] In some examples, such as Figure 7A and Figure 7B As shown, the light emitted from the first light-emitting element 11 in the first display area A1 is refracted and reflected before reaching the interface between the second back film layer 320 and air. Total internal reflection occurs at the interface between the second surface 3202 of the second back film layer 320 and air. When the totally reflected light reaches the first side surface 3203 of the second back film layer 320, total internal reflection occurs again at the interface between the first side surface 3203 and air. Since the first side surface 3203 is a non-flat surface, the second totally reflected light may propagate towards the substrate of the first display area A1 or continue to propagate towards the second surface 3202 of the second back film layer 320. This can reduce the intensity of reflected light received by the active layer of the transistors in the second display area A2 surrounding the first display area A1, thereby improving progressive dark ring defects. The remaining structure of the display panel in this embodiment can be referred to the description of the foregoing embodiment, and therefore will not be repeated here.

[0097] Figure 8 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure. Figure 9 for Figure 8A schematic diagram of the light path of the display panel is shown. In some examples, as Figure 8 As shown, the display panel comprises a first back film layer 310 on the side of the substrate 100 away from the display structure layer. The first back film layer 310 has a third surface 3101 facing the substrate 100 and a fourth surface 3102 opposite to the third surface 3101. The third surface 3101 can be bonded to the substrate 100 through the first adhesive layer 101. The third surface 3101 is a flat surface in the first display area A1 and is a non-flat surface in the second display area A2. In the direction perpendicular to the display panel, the third surface 3101 of the first back film layer 310 can have a plurality of second protrusions (such as Figure 9 As shown in (b), the third surface 3101 of the first back film layer 310 is a non-flat surface. The refractive index of the first adhesive layer 101 can be slightly smaller than the refractive index of the first back film layer 310. As shown in (b), the light rays emitted by the first light emitting element 11 in the first display area A1 are refracted and reflected to the interface between the first back film layer 310 and the air, and then total reflection occurs at the interface between the second surface 3102 of the first back film layer 310 and the air. When the total reflection light rays reach the third surface 3101 of the first back film layer 310 in the fourth display area A2, since the first surface 3101 of the second display area A2 is a non-flat surface, the incident angle of the total reflection light rays reaching the interface between the third surface 3101 and the first adhesive layer 101 is increased (such as

[0098] In some examples, Figure 9 As shown in (a), a schematic diagram of the light path when the third surface 3101 of the first back film layer 310 is a flat surface, Figure 9 As shown in (b), a schematic diagram of the light path when the third surface 3101 of the first back film layer 310 is a non-flat surface. The refractive index of the first adhesive layer 101 can be slightly smaller than the refractive index of the first back film layer 310. As shown in (b), the light rays emitted by the first light emitting element 11 in the first display area A1 are refracted and reflected to the interface between the first back film layer 310 and the air, and then total reflection occurs at the interface between the second surface 3102 of the first back film layer 310 and the air. When the total reflection light rays reach the third surface 3101 of the first back film layer 310 in the fourth display area A2, since the first surface 3101 of the second display area A2 is a non-flat surface, the incident angle of the total reflection light rays reaching the interface between the third surface 3101 and the first adhesive layer 101 is increased (such as Figure 8 and Figure 9 As shown in (b), the light rays emitted by the first light emitting element 11 in the first display area A1 are refracted and reflected to the interface between the first back film layer 310 and the air, and then total reflection occurs at the interface between the second surface 3102 of the first back film layer 310 and the air. When the total reflection light rays reach the third surface 3101 of the first back film layer 310 in the fourth display area A2, since the first surface 3101 of the second display area A2 is a non-flat surface, the incident angle of the total reflection light rays reaching the interface between the third surface 3101 and the first adhesive layer 101 is increased (such as Figure 9 As shown in (b), the incident angle θ2 is greater than Figure 9 As shown in (a), the incident angle θ1), the probability of total reflection can be increased, and the intensity of the reflected light received by the active layer of the transistor in the second display area A2 around the first display area A1 can be reduced, thereby the progressive dark ring defect can be improved. The remaining structures of the display panel of the present embodiment can refer to the description of the foregoing embodiments, and will not be described here.

[0099] Figure 10 A schematic diagram of another partial cross-sectional view of the display panel of at least one embodiment of the present disclosure is shown. In some examples, as Figure 10As shown, the first back film layer 310 of the display panel has a third surface 3101 facing the substrate 100 and a fourth surface 3102 opposite to the third surface 3101. The third surface 3101 can be bonded to the substrate 100 through a first adhesive layer 101. The third surface 3101 is a flat surface in the first display area A1 and a non-flat surface in the second display area A2. In a direction perpendicular to the display panel, the third surface 3101 of the first back film layer 310 may have a plurality of second protrusions. The plurality of second protrusions may protrude toward the substrate 100. The cross-section of the plurality of second protrusions may be trapezoidal or semi-circular, such that the third surface 3101 of the first back film layer 310 has a wavy cross-section. For example, the size of the plurality of second protrusions may be approximately the same. However, this embodiment is not limited to this. For example, the size of the plurality of second protrusions may be different.

[0100] In some examples, such as Figure 10 As shown, the light emitted from the first light-emitting element 11 in the first display area A1 is refracted and reflected, and after reaching the interface between the first back film layer 310 and the air, total internal reflection occurs at the interface between the fourth surface 3102 of the first back film layer 310 and the air. When the totally reflected light reaches the third surface 3101 of the first back film layer 310 in the second display area A2, since the third surface 3101 of the second display area A2 is a non-flat surface, the incident angle of the totally reflected light reaching the interface between the third surface 3101 and the first adhesive layer 101 is increased, which can increase the probability of total internal reflection and reduce the intensity of reflected light received by the active layer of the transistors in the second display area A2 surrounding the first display area A1, thereby improving the progressive dark ring defect. The remaining structure of the display panel of this embodiment can be referred to the description of the foregoing embodiment, and therefore will not be repeated here.

[0101] Figure 11 This is another partial cross-sectional schematic diagram of a display panel according to at least one embodiment of the present disclosure. In some examples, such as Figure 11 As shown, the first back film layer 310 of the display panel has a third surface 3101 facing the substrate 100. The third surface 3101 can be bonded to the substrate 100 via a first adhesive layer 101. The refractive index of the first adhesive layer 101 can be slightly less than the refractive index of the first back film layer 310. The third surface 3101 is a flat surface in the first display area A1 and a non-flat surface in the second display area A2. The second back film layer 320 can be fixed to the surface of the first back film layer 310 away from the substrate 100 via a second adhesive layer (not shown). The refractive index of the second adhesive layer can be approximately the same as or close to the refractive indices of the first back film layer 310 and the second back film layer 320. There is a certain distance between the first side surface 3203 of the second back film layer 320 and the heat dissipation film layer 200.

[0102] In some examples, such as Figure 11As shown, the light emitted by the first light emitting element 11 in the first display area A1 is refracted and reflected to the interface between the second back film layer 320 and air, and total reflection occurs at the interface between the second surface 3202 of the second back film layer 320 and air. When the total reflection light reaches the interface between the first side surface 3203 of the second back film layer 320 and air, total reflection occurs again. A part of the second total reflection light is reflected to the non-flat part (i.e., the area where the second protruding part is located) of the third surface 3101 of the first back film layer 310. The second protruding part of the third surface 3101 can increase the incident angle of the total reflection light reaching the interface between the third surface 3101 and the first adhesive layer 101, increase the probability of total reflection, and reduce the intensity of the reflected light received by the active layer of the transistor in the second display area A2 around the first display area A1, thereby improving the progressive dark ring defect. The remaining structure of the display panel of the present embodiment can refer to the description of the foregoing embodiments, and will not be described here.

[0103] Figure 12 Another partial cross-sectional schematic view of a display panel of at least one embodiment of the present disclosure. In some examples, as shown in Figure 12 The first back film layer 310 of the display panel has a third surface 3101 facing the substrate 100. The third surface 3101 is bonded to the substrate 100 by the first adhesive layer 101. The refractive index of the first adhesive layer 101 can be slightly smaller than the refractive index of the first back film layer 310. The third surface 3101 is a flat surface in the first display area A1 and is a non-flat surface in the second display area A2. The second back film layer 320 can be fixed to the surface of the first back film layer 310 away from the substrate 100 by a second adhesive layer (not shown). The refractive index of the second adhesive layer can be substantially the same as or close to the refractive index of the first back film layer 310 and the second back film layer 320. There is a certain distance between the first side surface 3203 of the second back film layer 320 and the heat dissipation film layer 200.

[0104] In some examples, as shown in Figure 12As shown, the light emitted by the first light emitting element 11 in the first display area A1 is refracted and reflected to the interface between the second back film layer 320 and air, total reflection occurs at the interface between the second surface 3202 of the second back film layer 320 and air, and total reflection occurs again when the total reflection light reaches the interface between the first side surface 3203 of the second back film layer 320 and air. Based on the non-flat first side surface 3203, the reflection path of the light can be changed, a small part of the light is reflected to the non-flat part (i.e., the area where the second protruding part is located) of the third surface 3101 of the first back film layer 310, the second protruding part of the third surface 3101 can increase the incident angle of the total reflection light reaching the interface between the third surface 3101 and the first adhesive layer 101, can increase the probability of total reflection, and can reduce the intensity of the reflected light received by the active layer of the transistor in the second display area A2 around the first display area A1, thereby improving the progressive dark ring defect. The remaining structure of the display panel of the present embodiment can be referred to the description of the foregoing embodiments, and will not be described here.

[0105] Figure 13 Another partial cross-sectional schematic view of a display panel of at least one embodiment of the present disclosure. In some examples, as shown in Figure 13 The first back film layer 310 of the display panel has a third surface 3101 facing the substrate 100. The third surface 3101 can be bonded to the substrate 100 through the first adhesive layer 101. The refractive index of the first adhesive layer 101 can be slightly smaller than the refractive index of the first back film layer 310. The third surface 3101 is a flat surface in the first display area A1 and is a non-flat surface in the second display area A2. The second back film layer 320 can be fixed to the surface of the first back film layer 310 away from the substrate 100 through the second adhesive layer 301. The first side surface 3203 of the second back film layer 320 can be a non-flat surface.

[0106] In some examples, as shown in Figure 13 As shown, the light emitted by the first light emitting element 11 in the first display area A1 is refracted and reflected to the interface between the second back film layer 320 and air, total reflection occurs at the interface between the second surface 3202 of the second back film layer 320 and air, and total reflection occurs again when the total reflection light reaches the interface between the first side surface 3203 of the second back film layer 320 and air. Based on the non-flat first side surface 3203, the reflection path of the light can be changed, a small part of the light is reflected to the non-flat part (i.e., the area where the second protruding part is located) of the third surface 3101 of the first back film layer 310, the second protruding part of the third surface 3101 can increase the incident angle of the total reflection light reaching the interface between the third surface 3101 and the first adhesive layer 101, can increase the probability of total reflection, and can reduce the intensity of the reflected light received by the active layer of the transistor in the second display area A2 around the first display area A1, thereby improving the progressive dark ring defect. The remaining structure of the display panel of the present embodiment can be referred to the description of the foregoing embodiments, and will not be described here.

[0107] Figure 14 Another partial cross-sectional schematic view of a display panel according to at least one embodiment of the present disclosure is shown. In some examples, as shown in FIG. 3B, the first side surface 3203 of the second back film layer 320 can be a non-flat surface. The first side surface 3203 of the second back film layer 320 can be configured to be non-transparent, for example, can be coated with a black coating. Light emitted by the first light emitting element 11 in the first display area A1 is refracted and reflected to the interface between the second back film layer 320 and air, and total reflection occurs at the interface between the second surface 3202 of the second back film layer 320 and air. When the total reflection light reaches the first side surface 3203 of the second back film layer 320, it can be absorbed by the black coating of the first side surface 3203, reducing the intensity of the reflected light received by the active layer of the transistor in the second display area A2 around the first display area A1, thereby improving the progressive dark ring defect. The remaining structures of the display panel according to the present embodiment can be referred to the descriptions of the previous embodiments, and thus will not be repeated here. Figure 14

[0108] The above examples are only illustrative. The above embodiments can be combined with each other to further improve the progressive dark ring defect. The present embodiment can reduce the intensity of the reflected light received by the active layer of the transistor in the second display area around the first display area, thereby improving the progressive dark ring defect, by improving the back film.

[0109] According to at least one embodiment of the present disclosure, a display device is also provided, which includes the display panel as described above.

[0110] Figure 15 A schematic view of a display device according to at least one embodiment of the present disclosure is shown. As shown in FIG. 4, the present embodiment provides a display device including a display panel 91 and a sensor 92 located on the light-out side of the display structure layer of the display panel 91. The sensor 92 is located on the non-display side of the display substrate 91. The orthographic projection of the sensor 92 on the display substrate 91 overlaps with the first display area A1. Figure 15

[0111] ​​In some example embodiments, the display substrate 91 can be a flexible OLED display substrate, a QLED display substrate, a Micro-LED display substrate, or a Mini-LED display substrate. The display device can be a product having an image (including a static image or a dynamic image, where the dynamic image can be a video) display function. For example, the display device can be any one of a display, a television, a billboard, a digital photo frame, a laser printer having a display function, a telephone, a mobile phone, a picture screen, a personal digital assistant (PDA), a digital camera, a camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, an information inquiry device (such as a service inquiry device of an electronic government, a bank, a hospital, a power department, etc.), a monitor, and the like. For another example, the display device can also be any one of a micro display, a VR device containing a micro display, an AR device, and the like.

[0112] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures can refer to the usual design. In the case of no conflict, the embodiments of the present disclosure, i.e., the features in the embodiments, can be combined with each other to obtain new embodiments. It should be understood by those skilled in the art that the technical solutions of the present disclosure can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present disclosure, and all should be covered in the scope of the claims of the present disclosure.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate comprising a first display area and a second display area located at least one side of the first display area, a sensor located at a non-display side of the display panel has an intersection between a projection of the display panel and the first display area of the display panel; a display structure layer located on the substrate, the display structure layer comprises a plurality of first light emitting elements located in the first display area, a plurality of second light emitting elements located in the second display area, a plurality of first pixel circuits, and a plurality of second pixel circuits, at least one first light emitting element in the plurality of first light emitting elements is electrically connected to at least one first pixel circuit in the plurality of first pixel circuits, and at least one second light emitting element in the plurality of second light emitting elements is electrically connected to at least one second pixel circuit in the plurality of second pixel circuits; a back film located on a side of the substrate away from the display structure layer, a thickness of the back film in the first display area is greater than a thickness of the back film in the second display area, the back film comprises a first back film layer and a second back film layer, the second back film layer is located on a side of the first back film layer away from the substrate, the second back film layer has a first surface close to the first back film layer and a second surface opposite to the first surface, and a first side surface connecting the first surface and the second surface; the back film satisfies at least one of the following conditions: the first side surface is configured to be opaque to light; an angle between the first side surface of the second back film layer and the first surface of the second back film layer is 45 degrees to 75 degrees; the display panel further comprises a heat dissipation film layer located on a side of the back film away from the substrate, a projection of the heat dissipation film layer on the substrate does not overlap a projection of the second back film layer on the substrate, and the first side surface of the second back film layer directly contacts the heat dissipation film layer; the first side surface of the second back film layer is a non-flat surface.

2. The display panel of claim 1, wherein, a projection of the first back film layer on the substrate covers a projection of the second back film layer on the substrate, and the second back film layer is located at least in the first display area; the first back film layer is bonded to a surface of the substrate away from the display structure layer through a first bonding layer.

3. The display panel of claim 2, wherein, the second back film layer and the first back film layer are connected through a second bonding layer.

4. The display panel of claim 2, wherein, a center of a projection of the second back film layer on the substrate coincides with a center of the first display area.

5. The display panel of claim 2, wherein, an area of a projection of the second back film layer on the substrate is greater than or equal to an area of the first display area.

6. The display panel of claim 2, wherein, a thickness of the second back film layer is 100 microns to 300 microns.

7. The display panel of claim 2, wherein, in a direction perpendicular to the display panel, the first side surface has a sawtooth-shaped or wavy cross section.

8. The display panel of claim 2, wherein, the first back film layer has a third surface close to the substrate, and the third surface is a non-flat surface in the second display area.

9. The display panel of claim 8, wherein, in a direction perpendicular to the display panel, the third surface has a sawtooth-shaped or wavy cross section in the second display area.

10. The display panel of claim 2, wherein, the back film and the substrate are connected through a first bonding layer, and a refractive index of the first bonding layer is less than a refractive index of the back film.

11. A display device comprising: the display panel comprises any one of claims 1 to 10.

12. The display device of claim 11, wherein, The display device further includes a sensor located on a side of the display panel opposite the display surface, wherein the sensor is located in an overlapping region of the display panel and the first display area.

13. A display panel, characterized by The display device includes: a substrate including a first display area and a second display area located on at least one side of the first display area, wherein a sensor located on a side of the display panel opposite the display surface is located in an overlapping region of the display panel and the first display area; a display structure layer located on the substrate, wherein the display structure layer includes a plurality of first light emitting elements located in the first display area, a plurality of second light emitting elements located in the second display area, a plurality of first pixel circuits, and a plurality of second pixel circuits, at least one of the plurality of first light emitting elements is electrically connected to at least one of the plurality of first pixel circuits, and at least one of the plurality of second light emitting elements is electrically connected to at least one of the plurality of second pixel circuits; a back film located on a side of the substrate opposite the display structure layer, wherein a surface of the back film near the substrate is a non-flat surface in the second display area, and a surface of the back film near the substrate is a flat surface in the first display area.

14. The display panel of claim 13, wherein, The back film includes a first back film layer and a second back film layer, the second back film layer is located on a side of the first back film layer opposite the substrate, the first back film layer covers the second back film layer in the substrate in a projection, and the second back film layer is located in at least the first display area.

15. The display panel of claim 14, wherein, The second back film layer and the first back film layer are connected by a second adhesive layer.

16. The display panel of claim 14, wherein, The center of the projection of the second back film layer on the substrate coincides with the center of the first display area.

17. The display panel of claim 14, wherein, The projection area of the second back film layer on the substrate is greater than or equal to the area of the first display area.

18. The display panel of claim 14, wherein, The thickness of the second back film layer is 100 microns to 300 microns.

19. The display panel of claim 14, wherein, The first back film layer has a third surface near the substrate, the third surface is a non-flat surface in the second display area, and the third surface is a flat surface in the first display area.

20. The display panel of claim 19, wherein, In a direction perpendicular to the display panel, the third surface has a jagged or wavy cross-section in the second display area.

21. The display panel of claim 13, wherein, The back film and the substrate are connected by a first adhesive layer, and the refractive index of the first adhesive layer is less than the refractive index of the back film.

Images