Display panel and display apparatus

Abstract

A display panel and a display apparatus. The display panel comprises: a driving backplane (BP); multiple light-emitting devices (LD), each light-emitting device comprising a first electrode (ANO), a light-emitting layer (EL), and a second electrode (CAT), the light-emitting devices comprising first light-emitting devices (LD1) and second light-emitting devices (LD2), a portion of the first electrode of each first light-emitting device in contact with the light-emitting layer of said first light-emitting device comprising a middle portion (AN1) and a climbing portion (AN2) connected to the middle portion, and the climbing portion expanding in a direction away from the middle portion; and a light-shielding layer (BL), disposed on the side of the light-emitting devices away from the driving backplane and comprising a plurality of light-shielding units (BU), each light-shielding unit being provided with a light-transmitting region, and one light-transmitting region overlapping with one second light-emitting device.

Description

Display panel and display device Technical Field

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

[0002] The application scope of OLED (Organic Light Emitting Diode) display panels has expanded from small and medium-sized wearable devices and mobile terminals to medium and large-sized automotive displays and other platforms.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] This disclosure provides a display panel and a display device.

[0005] According to one aspect of this disclosure, a display panel is provided, comprising:

[0006] Drive backplane;

[0007] Multiple light-emitting devices are arrayed along the row and column directions on one side of the driving backplate; each light-emitting device includes a first electrode, a light-emitting layer, and a second electrode stacked sequentially in a direction away from the driving backplate; each light-emitting device includes a first light-emitting device and a second light-emitting device; the portion of the first electrode of the first light-emitting device that contacts its light-emitting layer includes a middle portion and a ramp portion connected to the middle portion, the ramp portion expanding in a direction away from the middle portion;

[0008] A light-shielding layer is disposed on the side of the light-emitting device away from the driving back plate, and includes multiple light-shielding units. The orthographic projection of the light-shielding unit on the driving back plate is located outside the orthographic projection of the first light-emitting device on the driving back plate. The light-shielding unit has a light-transmitting area, and one of the light-transmitting areas overlaps with one of the second light-emitting devices.

[0009] In one exemplary embodiment of this disclosure, the distance between the orthographic projection of a second light-emitting device and the light-shielding unit overlapping with it on the driving back plate is defined as the first distance, and the minimum distance between the orthographic projections of the first light-emitting device and the light-shielding unit on the driving back plate is defined as the second distance. If the boundary of the orthographic projection of the light-emitting area on the driving back plate is located outside the boundary of the orthographic projection of the second light-emitting device overlapping with it on the driving back plate, the first distance is less than the second distance.

[0010] In one exemplary embodiment of this disclosure, the surface of the drive backplate has a plurality of flat areas and a ramp area connected to the flat areas, the ramp area expanding in a direction away from the flat areas;

[0011] The middle portion of the first electrode of the first light-emitting device is stacked in the flat region, and the sloping portion is stacked in at least a portion of the sloping region; the portion of the first electrode of the second light-emitting device that contacts its light-emitting layer is stacked in the flat region.

[0012] In one exemplary embodiment of this disclosure, the ramp portion of the first electrode of the first light-emitting device extends toward the side of its middle portion away from the drive backplate.

[0013] In one exemplary embodiment of this disclosure, the surface of the drive backplate has a plurality of first grooves, the inner surface of the first grooves including a bottom surface and a side surface, the bottom surface being the flat area and the side surface being the ramp area; the ramp area gradually expands in a direction away from its flat area; a first electrode is at least partially stacked on the inner surface of a first groove.

[0014] In one exemplary embodiment of this disclosure, the first electrode of the first light-emitting device covers the bottom surface and part of the side surface of the first groove, the area covered by the first electrode of the first light-emitting device in the middle part is the middle part, and the area covered by the side surface is the climbing part;

[0015] The display panel also includes:

[0016] A pixel definition layer is disposed on the surface of the driving backplate and has multiple pixel openings; one of the pixel openings exposes a first electrode;

[0017] In the first light-emitting device, the pixel opening exposes the middle portion and at least part of the ramp portion of the first electrode.

[0018] In one exemplary embodiment of this disclosure, the first electrode of the first light-emitting device covers the bottom surface and the side surface of the first groove, the area of ​​the first electrode of the first light-emitting device covering the bottom surface is the middle part, and the area covering part of the side surface is the climbing part;

[0019] The display panel also includes:

[0020] A pixel definition layer is disposed on the surface of the driving backplate and has multiple pixel openings; the pixel definition layer is a light-absorbing structure; one of the pixel openings exposes a first electrode;

[0021] In the first light-emitting device, the middle portion and at least part of the ramp portion of the first electrode are exposed by the pixel opening, and the area outside the ramp portion in the portion covering the side is covered by the pixel definition layer.

[0022] In one exemplary embodiment of this disclosure, the first electrode of each of the light-emitting devices covers the bottom surface and the side surface of the first groove, and the area of ​​the first electrode of the first light-emitting device covering the bottom surface is the middle part, and the area covering part of the side surface is the climbing part;

[0023] The display panel also includes:

[0024] A pixel definition layer is disposed on the surface of the driving backplate and has multiple pixel openings; the pixel definition layer is a light-absorbing structure; one of the pixel openings exposes a first electrode;

[0025] In the first light-emitting device, the middle portion and at least part of the ramp portion of the first electrode are exposed by the pixel opening, and the area outside the ramp portion in the region covering the side is covered by the pixel definition layer; the pixel definition layer covers the area of ​​the first electrode of the second light-emitting device that covers the side.

[0026] In one exemplary embodiment of this disclosure, the ramp portion of the first electrode of the first light-emitting device extends toward its middle portion toward the side near the drive back plate.

[0027] In one exemplary embodiment of this disclosure, the surface of the drive backplate has a plurality of protrusions, the surface of each protrusion including a top surface and a side surface surrounding the top surface, the surface of the top surface and the surface of the drive backplate other than the protrusions being the flat area, and the side surface being the ramp area; the ramp area gradually expands in a direction away from its flat area;

[0028] The area of ​​the top surface of the boss covered by the first electrode of the first light-emitting device is the middle part, and the area of ​​at least a portion of the side surface of the boss is the climbing part; the first electrode of the second light-emitting device is stacked on the surface of the driving back plate and is spaced apart from the boss.

[0029] In one exemplary embodiment of this disclosure, the first electrode of the first light-emitting device covers the area outside the boss in the surface of the drive back plate extending along the side of the boss to the drive back plate, and covers a portion of the side of the boss.

[0030] In one exemplary embodiment of this disclosure, a straight line extending along the column direction and passing through the center of one of the light-emitting devices is taken as the central axis of the light-emitting device; the ramp portion of the first electrode of the first light-emitting device is located on one side of its central axis, and the ramp portions of the first electrodes of a plurality of the first light-emitting devices are located on the same side of their central axis.

[0031] In one exemplary embodiment of this disclosure, a straight line extending along the column direction and passing through the center of one of the light-emitting devices is taken as the central axis of the light-emitting device; the first electrode of the first light-emitting device is provided with the ramp portion on both sides of its central axis.

[0032] In one exemplary embodiment of this disclosure, the first electrode of the first light-emitting device covers the area outside the boss in the surface of the drive back plate extending along the side of the boss to the drive back plate, and covers the side of the boss.

[0033] In one exemplary embodiment of this disclosure, the display panel further includes:

[0034] A pixel definition layer is disposed on the surface of the driving backplate; the pixel definition layer has a plurality of pixel openings, and one of the pixel openings exposes a first electrode; a boss is located in a pixel opening that exposes the first electrode of the first light-emitting device, and there is a gap between the boss and the pixel opening.

[0035] In one exemplary embodiment of this disclosure, the surface of the drive back plate is provided with a plurality of second grooves, the second grooves being spaced apart from the boss; the inner surface of the second groove includes a bottom surface and a side surface, the bottom surface being the flat area, and the side surface expanding in a direction away from the bottom surface;

[0036] The first electrode of the second light-emitting device is at least partially stacked on the bottom surface and at least partially on the side surface of the second groove.

[0037] In one exemplary embodiment of this disclosure, the display panel further includes:

[0038] A pixel definition layer is disposed on the surface of the driving backplate; the pixel definition layer has a plurality of pixel openings, and one of the pixel openings exposes a first electrode; a boss is located in a pixel opening exposing the first electrode of the first light-emitting device, and there is a gap between it and the pixel opening; a second groove overlaps with a pixel opening exposing the first electrode of the second light-emitting device.

[0039] In one exemplary embodiment of this disclosure, the drive backplane includes:

[0040] Substrate:

[0041] A transistor layer is disposed on one side of the substrate and includes a plurality of transistors;

[0042] Multiple support portions are disposed on the side of the transistor layer away from the substrate; one of the support portions overlaps with the ramp portion of the first electrode of the first light-emitting device;

[0043] A planarization layer covers the support portion, and the surface of the planarization layer away from the substrate is the surface of the drive backplate.

[0044] In one exemplary embodiment of this disclosure, the light-shielding layer includes a plurality of light-shielding sub-layers distributed sequentially along a direction away from the drive back plate, and each light-shielding sub-layer is provided with a plurality of light-transmitting holes; a light-transmitting area includes a plurality of light-transmitting holes located in different light-shielding sub-layers.

[0045] According to one aspect of this disclosure, a display device is provided, comprising the display panel described in any of the preceding claims.

[0046] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0047] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0048] Figure 1 is a top view of one embodiment of the display panel of this disclosure.

[0049] Figure 2 is a partial cross-sectional schematic diagram of the first embodiment of the first type of display panel of this disclosure.

[0050] Figures 3-5 are schematic diagrams of some of the film layers of the display panel in Figure 2.

[0051] Figure 6 is another partial cross-sectional schematic diagram of the first embodiment of the first type of display panel of this disclosure.

[0052] Figure 7 is a partial cross-sectional schematic diagram of the second embodiment of the first type of display panel of this disclosure.

[0053] Figure 8 is a partial cross-sectional schematic diagram of the third embodiment of the first type of display panel of this disclosure.

[0054] Figure 9 is a top view of the first electrode of the first light-emitting device in the first and second embodiments of the first type of display panel of this disclosure.

[0055] Figure 10 is a top view of the first electrode of the first light-emitting device in the third embodiment of the first type of display panel of this disclosure.

[0056] Figure 11 is a partial cross-sectional schematic diagram of the first embodiment of the second type of display panel of this disclosure.

[0057] Figure 12 is a partial cross-sectional schematic diagram of a second embodiment of the second type of display panel of this disclosure.

[0058] Figures 13-15 are schematic diagrams of some of the film layers of the display panel in Figure 12.

[0059] Figure 16 is a cross-sectional schematic diagram of one embodiment based on the first type of display panel.

[0060] Figure 17 is a top view of the first electrode in one embodiment based on a first type of display panel.

[0061] Figure 18 is a schematic diagram of a planarization layer formed in one embodiment of the display panel of this disclosure.

[0062] Figure 19 is a schematic diagram of forming a planarization layer in another embodiment of the display panel of this disclosure.

[0063] Figure 20 is a top view of one embodiment of the display device of this disclosure. Detailed Implementation

[0064] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0065] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0066] In this document, the row direction X and column direction Y are two intersecting directions. In the accompanying drawings, the row direction X is horizontal and the column direction Y is vertical, and they are perpendicular to each other. However, this is not a limitation; the row direction X and column direction Y can also be non-perpendicular. Furthermore, those skilled in the art will understand that as the touch display panel rotates, the actual orientation of the row direction X and column direction Y may change, but their relative positions remain unchanged.

[0067] In this article, the "overlap" of features A and B means that the orthographic projections of features A and B on a plane at least partially coincide; the plane can be the surface of a display substrate, driving backplane, substrate, etc.

[0068] This disclosure provides a display panel, as shown in FIG1. ​​The display panel is divided into a display area AA and a peripheral area WA located outside the display area AA. The peripheral area WA can be a continuous annular area surrounding the display area AA, or it can be a discontinuous area surrounding the display area AA. For example, the peripheral area WA can be distributed on both sides of the display area AA. The display area AA can be used to emit light to display images, while the peripheral area WA does not emit light.

[0069] As shown in Figure 2, the display panel may include a driving backplate BP and multiple light-emitting devices (LDs) disposed on one side of the driving backplate BP, wherein:

[0070] The driving backplane (BP) has a driving circuit that drives the light-emitting device (LD) to emit light to display an image. As shown in Figure 2, in some embodiments of this disclosure, the driving backplane (BP) may include a substrate (SU) and a circuit layer located on one side of the substrate (SU). The substrate (SU) may be a flat plate structure, and its material may be a rigid material such as glass or a flexible material such as polyimide. Furthermore, the substrate (SU) may be a single-layer or multi-layer structure.

[0071] The circuit layer includes the aforementioned driving circuitry. For example, the driving circuitry may include pixel circuitry located in the display area AA and peripheral circuitry located in the peripheral area WA. The pixel circuitry can be of structures such as 3T1C, 7T1C, or 8T1C, as long as it can drive the light-emitting diodes (LDs) to emit light. No special limitations are placed on its structure here. Here, nTmC indicates that one pixel circuit includes n thin-film transistors (represented by the letter "T") and m capacitors (represented by the letter "C"). The number of pixel circuits can be the same as the number of light-emitting diodes (LDs), and they are connected one-to-one with each LD. Of course, multiple LDs can be connected to the same pixel circuit; no special limitations are placed here.

[0072] The peripheral circuit is connected to the pixel circuit and is used to input driving signals to the pixel circuit in order to control the light-emitting device (LD) to emit light. The peripheral circuit may include a gate driving circuit and a light-emitting control circuit, and of course, it may also include other circuits. The specific structure of the peripheral circuit is not specifically limited here.

[0073] The aforementioned driving circuit may include multiple thin-film transistors (TFTs) and capacitors. The TFTs may be top-gate or bottom-gate type TFTs, and each TFT may include an overlapping active layer and a gate. The active layers of each TFT are disposed on the same semiconductor layer; alternatively, they may be disposed on multiple semiconductor layers, with the active layers of different TFTs distributed on different semiconductor layers. The semiconductor layer material may be polysilicon, metal oxide, or other semiconductor materials. For example, if the transistors in the pixel circuit are all polysilicon transistors, their active layers may be located on the same semiconductor layer; or, if the pixel circuit includes both polysilicon transistors and oxide transistors, the active layer of the polysilicon transistor may be located on the first semiconductor layer, and the active layer of the oxide transistor may be located on the second semiconductor layer, with the second semiconductor layer located on the side of the first semiconductor layer away from the substrate SU.

[0074] As shown in Figure 2, the circuit layer may include a transistor layer ML and a connection layer located on the side of the transistor layer ML away from the substrate SU. The transistors of the driving circuit may be located on the transistor layer ML, and the capacitors may also be located on the transistor layer ML. The connection layer may include at least one source / drain layer, which may be connected to at least some of the transistors to form the driving circuit.

[0075] As shown in Figure 2, taking the top-gate polysilicon thin-film transistor as an example of the transistor in the pixel circuit, in some embodiments, the transistor layer ML may include a semiconductor layer SE, a first gate insulating layer GI1, a first gate layer GA1, a second gate insulating layer GI2, a second gate layer GA2 and an interlayer dielectric layer ILD stacked sequentially along the direction away from the substrate SU, and the active layer of the transistor is located in the semiconductor layer SE.

[0076] The interconnect layer may include one, two, or more source / drain layers, each covered by a planarization layer. The surface of the planarization layer furthest from the substrate SU is the surface of the driving backplane BP. Taking two source / drain layers and two planarization layers as an example: the interconnect layer may include a first source / drain layer SD1, a first planarization layer PLN1, a second source / drain layer SD2, and a second planarization layer PLN2 stacked sequentially in the direction away from the substrate SU; of course, the interconnect layer may also include a passivation layer, which may cover the first source / drain layer SD1, and the first planarization layer PLN1 covers the passivation layer. The active layer of the thin-film transistor is located on the semiconductor layer SE, the gate is located on the first gate layer GA1, and the two plates of the capacitor are located on the first gate layer GA1 and the second gate layer GA2. The first source / drain layer SD1 and the second source / drain layer SD2 are used to establish connections between at least some of the thin-film transistors and between the thin-film transistors and the capacitor, and are used to transmit driving signals. The type of driving signal and the specific pattern of each film layer depend on the specific configuration of the driving circuit and are not specifically limited here.

[0077] In other embodiments of this disclosure, the interconnect layer may consist of only one source / drain layer and one planarization layer. The source / drain layer may be disposed on the surface of the transistor layer ML away from the substrate SU, and the planarization layer covers the source / drain layer. The surface of the planarization layer away from the substrate SU is the surface of the driving backplane BP. Alternatively, the interconnect layer may include three source / drain layers and three planarization layers, i.e., a first source / drain layer, a first planarization layer, a second source / drain layer, a second planarization layer, a third source / drain layer, and a third planarization layer are stacked sequentially along the direction away from the substrate SU, and the surface of the third planarization layer away from the substrate SU is the surface of the driving backplane BP.

[0078] As shown in Figures 1 and 2, the light-emitting device (LD) can be disposed on the surface of the driving backplane BP. The surface of the driving backplane BP is the surface of the driving backplane BP that is farthest from the substrate SU, that is, the surface of the planarization layer farthest from the substrate SU. For example, for the connection layer using two source / drain layers mentioned above, the light-emitting device LD can be disposed on the surface of the second planarization layer PLN2 that is farthest from the substrate SU. The light-emitting device LD can be an OLED (organic light-emitting diode) using organic light-emitting materials, or it can be a Mini LED (sub-millimeter light-emitting diode, size 100μm-200μm), Micro LED (micro light-emitting diode, size not greater than 100μm), or LED (light-emitting diode, size greater than 200μm) using inorganic light-emitting materials, etc. There is no special limitation here, as long as it can emit light. The light-emitting device LD is located within the display area AA.

[0079] As shown in Figure 2, taking an OLED as an example, the light-emitting device (LD) may include a first electrode (ANO), a light-emitting layer (EL), and a second electrode (CAT) stacked sequentially along the direction away from the driving backplane (BP). By applying an electrical signal to the first electrode (ANO) and the second electrode (CAT), the light-emitting layer (EL) can be excited to emit light. The specific light-emitting principle will not be detailed here. The first electrode (ANO) can serve as the anode, and the second electrode (CAT) can serve as the cathode. Both electrodes are made of conductive materials such as metals and metal oxides. The light-emitting layer (EL) may include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer stacked sequentially along the direction away from the driving backplane (BP).

[0080] In some embodiments of this disclosure, the light-emitting layers EL of each light-emitting device LD can be arranged at intervals, and the light-emitting colors of different light-emitting devices LD can be different.

[0081] As shown in Figures 17 and 20, in some other embodiments of this disclosure, the light-emitting layer EL can also be a continuous monolayer structure, and it may include two or more light-emitting sublayers connected in series along a direction away from the driving backplate BP. At least one light-emitting sublayer is connected in series with an adjacent light-emitting sublayer through a charge generation layer. A light-emitting sublayer may include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer. The light-emitting material layers of each light-emitting device LD can be spaced apart, so that the light-emitting material layers are different. At least one of the hole injection layer, hole transport layer, electron transport layer, and electron injection layer is a continuous monolayer structure. That is, if at least one of the light-emitting sublayers is a continuous monolayer structure, it is considered that the light-emitting sublayer is a continuous monolayer structure. If at least one light-emitting sublayer is a continuous monolayer structure, it is considered that the light-emitting layer EL is a continuous monolayer structure. Therefore, although the light-emitting layer EL is a continuous monolayer structure, it can form multiple light-emitting devices LD, and the colors emitted by different light-emitting devices LD can be different.

[0082] When an electrical signal is applied to the first electrode ANO and the second electrode CAT, each light-emitting sublayer can emit light, and different light-emitting sublayers can emit light of the same color, making one light-emitting device LD equivalent to multiple light-emitting devices connected in series, which is beneficial to improving brightness.

[0083] As shown in Figures 2-5, the display substrate PNL may further include a pixel definition layer PDL separating the light-emitting devices (LDs). This pixel definition layer PDL can be disposed on the same surface as the light-emitting devices (LDs) on the driving backplane (BP). For example, the pixel definition layer PDL can be disposed on the surface of the second planarization layer away from the substrate (SU) along with the first electrode (ANO). Simultaneously, the thickness of the pixel definition layer PDL is greater than the thickness of the first electrode (ANO), and the pixel definition layer PDL has pixel openings PH that expose each first electrode (ANO). Each pixel opening PH exposes one first electrode (ANO), and the light-emitting device (LD) is defined through the pixel openings PH. The pixel definition layer PDL can be made of a light-transmitting material; it can also be made of a resin mixed with carbon black, thereby absorbing light; of course, other light-absorbing materials can also be used. The light-emitting layer (EL) and the second electrode (CAT) are sequentially stacked on the first electrode (ANO) within the pixel openings PH.

[0084] The shape and size of the light-emitting device (LD) are defined by the pixel aperture (PH). The range of the light-emitting device (LD) is the range of the pixel aperture (PH). The size of the light-emitting device (LD) is the size of the pixel aperture (PH). The boundary of the orthographic projection of the light-emitting device (LD) onto the driving backplane (BP) is the boundary of the orthographic projection of the pixel aperture (PH) onto the driving backplane (BP).

[0085] Each light-emitting device (LD) includes at least two LDs of different sizes; the LDs of different sizes emit different colors. Furthermore, the LDs can be divided into multiple light-emitting units, and each light-emitting unit can include at least three LDs emitting different colors; for example, one light-emitting unit includes three LDs: a red-emitting LD, a blue-emitting LD, and a green-emitting LD. The orthographic projection of the LD onto the driving backplane (BP) can be a circle, an ellipse, or a rectangle, or other shapes.

[0086] The display panel may also include isolation pillars PS, which may be disposed on the surface of the pixel definition layer PDL away from the driving backplane BP, for supporting the mask required for the vapor deposition of the light-emitting layer EL. The total area of ​​the orthographic projection of each isolation pillar PS on the driving backplane BP is less than or equal to 20% of the area of ​​the region located in the display area AA in the driving backplane BP.

[0087] The following is an exemplary description of a method for manufacturing a display substrate PNL:

[0088] The method may include steps S110-S160, wherein:

[0089] Step S110: Form a transistor layer on the substrate;

[0090] Step S120: A connection layer is formed on the surface of the transistor layer away from the substrate. The connection layer includes at least one source / drain layer and a planarization layer covering the source / drain layer. The planarization layer farthest from the substrate forms a planar region and a ramp region on the surface away from the substrate.

[0091] Step S130: Form a plurality of first electrodes on the surface of the planar layer furthest from the substrate, including the first electrodes of the first light-emitting device and the second light-emitting device;

[0092] Step S140: Form a pixel definition layer and isolation pillars. The pixel definition layer has pixel openings that expose the first electrode.

[0093] Step S150: Form a light-emitting layer that is attached to the first electrode within the pixel opening;

[0094] Step S160: Form a second electrode covering each light-emitting layer.

[0095] As shown in Figure 2, the display panel also includes a TFE encapsulation layer, which covers each light-emitting device (LD) to block external moisture and oxygen, preventing the LD from being corroded. In some embodiments of this disclosure, the TFE encapsulation layer can be a thin-film encapsulation method, which may include a first inorganic layer, an organic layer, and a second inorganic layer, wherein:

[0096] The first inorganic layer can cover each light-emitting device (LD), that is, the first inorganic layer can cover the surface of the second electrode (CAT) away from the driving backplane (BP). The material of the first inorganic layer can include inorganic insulating materials such as silicon nitride and silicon oxide.

[0097] The organic layer can be disposed on the surface of the first inorganic layer away from the driving backplane BP. The boundary of the orthographic projection of the organic layer on the driving backplane BP can be located in the peripheral area WA, ensuring that the organic layer can cover each light-emitting device LD.

[0098] The second inorganic layer can cover both the organic layer and the first inorganic layer that is not covered by the organic layer. The second inorganic layer can block the intrusion of water and oxygen, and planarization can be achieved by the organic layer, which is fluid before curing. The material of the second inorganic layer can include inorganic insulating materials such as silicon nitride and silicon oxide.

[0099] In applications such as in-vehicle displays, mobile phones, tablets, televisions, and desktop computers, users sometimes need privacy for the display panel, but at other times they want to share the screen with others. Taking in-vehicle displays as an example, a vehicle display device may include multiple display panels, including a driver's side panel and a passenger side panel. For the driver's side panel, the main purpose of privacy protection is to prevent glare from the panel reflecting off the windshield and creating a reflection that could affect driving safety. For the passenger side panel, the purpose of privacy protection is to prevent the displayed content from distracting the driver. However, in non-driving situations, the passenger side panel also needs to share the screen so that the passenger and driver can share the view. In privacy protection mode, the passenger side panel needs to achieve rapid brightness decay in both the H (horizontal) and V (vertical) directions to obtain a privacy protection angle, ensuring the driver is not disturbed by light. In shared mode, a minimum brightness requirement is set for the shared angle in the H (horizontal) direction. To address this issue, the inventors proposed a new display panel that can switch between a privacy mode and a shared mode. In privacy mode, the passenger-side panel has a narrow viewing angle, making it difficult for the driver to see the image. In shared mode, the passenger-side panel has a wide viewing angle, allowing the driver to see the image.

[0100] As shown in Figure 1, to enable a display panel to have both shared and privacy modes, the light-emitting devices (LDs) in the display panel can be divided into at least two categories: a first light-emitting device LD1 and a second light-emitting device LD2. The display panel may also include a light-shielding layer BL, which can be disposed on the side of the light-emitting device LD away from the driving backplane BP. For example, the light-shielding layer BL can be disposed on the surface of the encapsulation layer TFE away from the driving backplane BP. Alternatively, the display panel may also include a touch layer, with the light-shielding layer BL disposed on the side of the touch layer away from the driving backplane BP. Furthermore, the touch layer can at least partially reuse as the light-shielding layer BL, meaning that the touch layer can also serve a light-shielding function.

[0101] As shown in Figure 2, the light-shielding layer BL includes multiple light-shielding units BU. The orthographic projection of the light-shielding unit BU on the driving back plate BP is outside the orthographic projection of the first light-emitting device LD1 on the driving back plate BP. Each light-shielding unit BU has a light-transmitting area LA. One light-transmitting area LA overlaps with a second light-emitting device LD2, so that some of the light emitted by the second light-emitting device LD2 can be emitted through the light-transmitting area LA, and some of the light can be blocked by the light-shielding unit BU. Thus, the light emission range of the second light-emitting device LD2 can be limited by the light-transmitting area LA.

[0102] If the boundary of the orthographic projection of a light-transmitting area LA on the driving backplate BP is located outside the boundary of the orthographic projection of the overlapping second light-emitting device LD2 on the driving backplate BP, the distance between the boundary of the second light-emitting device LD2 and the boundary of the overlapping light-transmitting area LA can be less than the distance between the light-shielding unit BU and any first light-emitting device LD1. That is, let the distance between the orthographic projections of the light-transmitting area LA of the second light-emitting device LD2 and the overlapping light-shielding unit BU on the driving backplate BP be the first distance H, and the minimum distance between the orthographic projections of the first light-emitting device and the light-shielding unit on the driving backplate BP be the second distance L, where the first distance H is less than the second distance L. Therefore, the blocking range of the light from the second light-emitting device LD2 by the light-shielding unit BU can be greater than the blocking range of the light from the first light-emitting device LD1, making the viewing angle of the second light-emitting device LD2 smaller than the viewing angle of the first light-emitting device LD1. The boundary of the orthographic projection of the second light-emitting device LD2 on the driving backplate BP can be located inside or outside the boundary of the orthographic projection of the overlapping light-transmitting area LA on the driving backplate BP.

[0103] Of course, the boundary of the orthographic projection of the light-transmitting area LA on the driving back plate BP can also be located within the boundary of the orthographic projection of the second light-emitting device LD2 on the driving back plate BP (including the two overlapping). The first distance H can be greater than, equal to or less than the second distance L. The smaller the light-transmitting area LA, the smaller the viewing angle of the second light-emitting device LD2 can be.

[0104] In some embodiments of this disclosure, as shown in FIG2, the distance between the light-shielding unit BU and the nearest first light-emitting device LD1 is a second distance L, which is 4μm-30μm and H<L.

[0105] In privacy mode, the second light-emitting device LD2 emits light, while the first light-emitting device LD1 does not emit light or its brightness is reduced to a certain extent. In this state, the viewing angle of the display panel is narrow, achieving a privacy protection effect. In shared mode, both the first and second light-emitting devices LD1 and LD2 emit light normally. Alternatively, only the first light-emitting device LD1 can emit light. The first light-emitting device LD1 is not limited by the light-transmitting area LA, and its viewing angle is greater than that of the second light-emitting device LD2, increasing the overall viewing angle of the display panel and achieving screen sharing. Therefore, the first and second light-emitting devices LD1 and LD2 can be driven independently.

[0106] As shown in Figure 1, in some embodiments of this disclosure, the first light-emitting device LD1 and the second light-emitting device LD2 can be alternately distributed in at least one of the row direction X and the column direction Y, so that the space of the display area AA can be fully utilized and the image can be displayed uniformly in both the privacy mode and the shared mode. In other embodiments of this disclosure, the first light-emitting device LD1 can be divided into multiple first light-emitting units, and a first light-emitting unit includes multiple first light-emitting devices LD1; the second light-emitting device LD2 can be divided into multiple second light-emitting units, and a second light-emitting unit includes multiple second light-emitting devices LD2; the first light-emitting units and the second light-emitting units are alternately distributed along at least one of the row direction X and the column direction Y. Of course, in other embodiments of this disclosure, the first light-emitting device LD1 and the second light-emitting device LD2 can also be distributed in other ways.

[0107] As shown in Figure 2, in some embodiments of this disclosure, the light-shielding layer BL may include two or more light-shielding sub-layers BM distributed sequentially along a direction away from the driving backplate BP. The light-shielding sub-layers BM may be made of light-absorbing materials, such as resin doped with carbon black, or reflective materials such as metal; alternatively, the light-shielding sub-layers BM may be partially made of light-absorbing materials and partially made of reflective materials. Each light-shielding sub-layer BM has multiple light-transmitting holes LH, and a light-transmitting area LA includes multiple light-transmitting holes LH located in different light-shielding sub-layers BM. The range of the light-transmitting area LA is the range of the light-transmitting holes LH, that is, a light-transmitting hole LH overlaps with a second light-emitting device LD2. By using multiple light-shielding sub-layers BM, the light emission range of the second light-emitting device LD2 can be further limited, thereby improving the privacy protection effect.

[0108] Furthermore, as shown in Figure 2, the light-shielding layer BL may also include multiple light-transmitting planarization layers OC, the number of which may be the same as the number of light-shielding sub-layers BM. Each light-shielding sub-layer BM is covered by a light-transmitting planarization layer OC to achieve planarization.

[0109] Of course, in other embodiments of this disclosure, the light-shielding layer BL may also consist of only a light-shielding sublayer BM and a light-transmitting planarization layer OC, as long as the light emission angle of the second light-emitting device LD2 can be reduced.

[0110] The inventors discovered that for display panels capable of switching between privacy and shared modes, the brightness of the first light-emitting device (LD1) at a wide viewing angle (above 40° / 50°) is relatively low. To improve the brightness at this angle, the overall brightness of the LD can be increased by increasing its power, but this shortens the LD's lifespan. Therefore, the inventors propose that the brightness at a wide viewing angle can be improved without increasing power by redesigning the structure of the LD. This is explained in detail below:

[0111] As shown in Figures 2, 6-8, 11, and 12, the actual radiated area of ​​the light-emitting device (LD) is based on the area where the first electrode ANO contacts the light-emitting layer EL. Without increasing the power, the contact area between the first electrode ANO and the light-emitting layer EL can be increased, and its morphology can be changed. Based on a flat first electrode ANO, an inclined first electrode ANO can be added to increase the light output at large angles. For the first light-emitting device LD1, which plays a sharing role, the portion where its first electrode ANO contacts its light-emitting layer EL includes a middle portion AN1 and a ramp portion AN2. The ramp portion AN2 is connected to the edge of the middle portion AN1. The middle portion AN1 can be set flat, and the ramp portion AN2 can be set at an inclination relative to the middle portion AN1 and expands in a direction away from the middle portion AN1.

[0112] In the design where the first electrode ANO is directly stacked on the surface of the driving backplate BP, the first electrode ANO can have a central portion AN1 and a ramp portion AN2 by making the surface of the driving backplate BP uneven. For example, the surface of the driving backplate BP can have multiple flat regions B1 and ramp regions B2 connected to the flat regions B1, and the ramp regions B2 can expand in a direction away from the flat regions B1. The flat regions B1 can be parallel to the substrate SU, and the ramp regions B2 are inclined relative to the substrate SU, thus forming a certain angle with the substrate SU, which can be an acute angle. The ramp regions B2 can extend in a direction away from the substrate SU or in a direction close to the substrate SU, and the ramp regions B2 expand away from the flat regions B1 connected to them. In addition, the flat regions B1 can be located in the same plane or distributed in different planes, as long as they are flat.

[0113] It should be noted that, due to limitations in the manufacturing process, the parallelism in this article is not limited to absolute geometric parallelism, but can have a certain degree of error. Similarly, flatness is not limited to a standard geometric plane, but can have a certain degree of undulation.

[0114] The middle portion AN1 of the first electrode ANO of the first light-emitting device LD1 is stacked on the flat region B1, and the sloping portion AN2 can be stacked on at least a portion of the sloping region B2. The portion of the first electrode ANO of the second light-emitting device LD2 that contacts its light-emitting layer EL is stacked on the flat region B1. The area of ​​the orthographic projection of the middle portion AN1 of the first electrode ANO of the first light-emitting device LD1 onto the driving backplate BP is not less than the area of ​​the orthographic projection of the first electrode ANO of the second light-emitting device LD2 onto the driving backplate BP. That is, the portion of the first electrode ANO of the first light-emitting device LD1 that contacts its light-emitting layer EL is larger than the portion of the first electrode ANO of the second light-emitting device LD2 that contacts its light-emitting layer EL, so that the light-emitting range of the first light-emitting device LD1 is larger than that of the second light-emitting device LD2.

[0115] Based on the relative positions of the middle portion AN1 and the ramp portion AN2 of the first electrode ANO of the first light-emitting device LD1, the display panel can be divided into two categories, as shown in Figures 2-8. In the first type of display panel, the ramp portion AN2 of the first electrode ANO of the first light-emitting device LD1 extends towards the middle portion AN1 away from the driving backplate BP. As shown in Figures 11-15, in the second type of display panel, the ramp portion AN2 of the first electrode ANO of the first light-emitting device LD1 extends towards the middle portion AN1 closer to the driving backplate BP. The two types of display panels will be described in detail below:

[0116] Type 1 display panel

[0117] The ramp portion AN2 of the first electrode ANO of the first light-emitting device LD1 extends toward the side of its middle portion AN1 away from the driving backplate BP, such that the middle portion AN1 and the ramp portion AN2 can form a recessed structure recessed toward the substrate SU. To achieve the aforementioned morphology of the first light-emitting device LD1, the surface of the driving backplate BP can have multiple first grooves CR1. The inner surface of the first groove CR1 includes a bottom surface C1 and a side surface C2, with the side surface C2 surrounding the edge of the bottom surface C1. The bottom surface C1 can be a flat region B1, and the side surface C2 can be a ramp region B2, with the ramp region B2 gradually expanding away from its flat region B1, i.e., the cross-section of the first groove CR1 (parallel to the substrate SU) gradually increases away from the flat region B1. The first electrode ANO of the first light-emitting device LD1 is at least partially stacked on the inner surface of one first groove CR1.

[0118] In the first implementation:

[0119] As shown in Figures 2-6, the first electrode AN0 of the first light-emitting device LD1 covers the bottom surface C1 and part of the side surface C2 of the first groove CR1. The area covering the flat area B1 is the middle part AN1, and the area covering the sloping area B2 is the sloping part AN2. Since both the middle part AN1 and the sloping part AN2 are in contact with the light-emitting layer EL, their corresponding areas can emit light. The sloping part AN2 can increase the light output of the first light-emitting device LD1. Furthermore, since the sloping part AN2 covers part of the side surface C2, its corresponding area can emit light that is tilted towards the side surface C2 not covered by the sloping part AN2, thereby increasing the brightness at a wide viewing angle. For vehicle display devices, the passenger-side panel only needs to increase the brightness at a wide angle towards the driver's side, while it does not need to increase the brightness at a wide angle towards the outside of the passenger side. The display panel of the first embodiment described above can achieve a directional increase in the light output at a wide angle.

[0120] The pixel definition layer (PDL) can be a light-transmitting structure or a light-absorbing structure. In the first light-emitting device (LD1), the pixel opening (PH) can expose the middle part (AN1) and at least part of the ramp part (AN2) of the first electrode (ANO). The light-emitting layer (EL) can cover the middle part (AN1) and the ramp part (AN2), and the light-emitting layer (EL) can extend to the area in the side surface (C2) that is not covered by the ramp part (AN2). At the same time, the light-emitting layer (EL) of the second light-emitting device (LD2) can cover the side surface (C2) of the first groove (CR1). The light-emitting layer (EL) of each light-emitting device (LD) can also extend to the side wall of the pixel opening (PH).

[0121] Furthermore, as shown in Figure 9, the central axis AS of the light-emitting device LD is defined as a straight line extending along the column direction Y and passing through the center of the light-emitting device LD. The ramp portion AN2 of the first electrode ANO of the first light-emitting device LD1 is located on one side of the central axis AS, so that the area corresponding to the ramp portion AN2 of the first light-emitting device LD1 is concentrated on one side, thereby emitting light to the other side. At the same time, the ramp portion AN2 of the first electrode ANO of each first light-emitting device LD1 is located on the same side of the central axis AS. For example, the ramp portion AN2 of the first electrode ANO is located on the right or left side of the central axis AS, so that the first light-emitting devices LD1 of the entire display panel increase the large-angle light emission in the same direction.

[0122] As shown in Figure 16, in some alternative embodiments, in the first electrode ANO of the first light-emitting device LD1, the climbing portion AN2 can be provided on both sides of the central axis AS, and can be symmetrically arranged about the central axis AS, thereby increasing the brightness of the large viewing angle to both sides of the central axis AS.

[0123] In the second implementation:

[0124] As shown in Figures 7 and 8, the first electrode ANO of the first light-emitting device LD1 covers the bottom surface C1 and all the side surfaces C2 of the first groove CR1. The area of ​​the first electrode ANO covering the bottom surface C1 is the middle part AN1, and the area covering part of the side surface C2 is the ramp part AN2, which can contact the light-emitting layer EL. The area covering the other part of the side surface C2 is not the ramp part AN2 and does not contact the light-emitting layer EL. Specifically, the pixel definition layer is a light-absorbing structure, and a first electrode ANO is exposed by a pixel opening PH. In the first light-emitting device LD1, the middle part AN1 and at least part of the ramp part AN2 of the first electrode ANO are exposed by the pixel opening PH, and the area AN3 outside the ramp part AN2 of the part covering the side surface C2 is covered by the pixel definition layer PDL. That is, the pixel definition layer PDL extends into the first groove CR1 and covers the part of the first electrode ANO that covers the side surface C2. The first electrode ANO not covered by the pixel definition layer PDL is the middle part AN1 and the ramp part AN2. The light-emitting layer EL of each light-emitting device LD can also extend to the sidewall of the pixel opening PH.

[0125] Since the ramp AN2 covers part of the side C2, the corresponding area can emit light that is angled towards the side C2 not covered by the ramp AN2, thereby increasing the brightness at a wide viewing angle. For in-vehicle display devices, the passenger-side panel only needs to increase the brightness at a wide angle towards the driver's side, but does not need to increase the brightness at a wide angle towards the outside of the passenger side. The display panel of the second embodiment described above can achieve a directional increase in the amount of light emitted at a wide angle.

[0126] Furthermore, as shown in Figures 7 and 10, the central axis AS of the light-emitting device LD is defined by a straight line extending along the column direction Y and passing through the center of the light-emitting device LD. The ramp portion AN2 of the first electrode ANO of the first light-emitting device LD1 is located on one side of the central axis AS, so that the area corresponding to the ramp portion AN2 of the first light-emitting device LD1 is concentrated on one side, thereby emitting light to the other side. At the same time, the ramp portion AN2 of the first electrode ANO of each first light-emitting device LD1 is located on the same side of the central axis AS. For example, the ramp portion AN2 of the first electrode ANO is located on the right or left side of the central axis AS, so that the first light-emitting devices LD1 of the entire display panel increase the large-angle light emission in the same direction. The area AN3 of the first electrode ANO of the first light-emitting device LD1 other than the ramp portion AN2 forms a continuous annular area with the ramp portion AN2, and this annular area covers the entire side surface C2 of the first groove CR1.

[0127] As shown in Figure 17, in some alternative embodiments, in the first electrode ANO of the first light-emitting device LD1, ramp portions AN2 can be provided on both sides of the central axis AS, and can be symmetrically arranged about the central axis AS, thereby increasing the brightness of the wide viewing angle on both sides of the central axis AS. Simultaneously, the first electrode ANO of the first light-emitting device LD1 covers all sides C2 of the first groove CR1, and a portion of the first electrode ANO can be covered by the pixel definition layer PDL of the light-absorbing structure. The uncovered portion is the ramp portion AN2, and the light-emitting layer EL does not contact the area AN3 covered by the pixel definition layer PDL.

[0128] As shown in Figures 5 and 8, in the third embodiment, the first electrode ANO of each light-emitting device LD covers the bottom surface C1 and the side surface C2 of the first groove CR1, and the area of ​​the first electrode ANO of the first light-emitting device LD1 covering the bottom surface C1 is the middle part AN1, and the area covering part of the side surface C2 is the climbing part AN2. The pixel definition layer PDL is a light-absorbing structure.

[0129] In the first light-emitting device LD1, the middle portion AN1 and at least part of the ramp portion AN2 of the first electrode ANO are exposed by the pixel opening PH, and the area outside the ramp portion AN2 in the region covering the side surface C2 is covered by the pixel definition layer PDL. The pixel definition layer PDL covers the area of ​​the side surface C2 covered by the first electrode ANO of the second light-emitting device LD2. That is, although the first electrode ANO of the second light-emitting device LD2 covers the side surface C2 of the first groove CR12, it is covered by the pixel definition layer PDL, so that only the portion of the bottom surface C1 of the first groove CR1 covered by the second light-emitting device LD2 is exposed by the pixel opening PH. In this way, when forming the first electrode ANO, it is not necessary to distinguish between the first light-emitting device LD1 and the second light-emitting device LD2. The pixel definition layer PDL can be used to make the covered areas different, thereby achieving different light emission ranges for the first light-emitting device LD1 and the second light-emitting device LD2. The light-emitting layer EL of each light-emitting device LD can also extend to the sidewall of the pixel opening PH. The first light-emitting device LD1 covers the climbing portion AN2, and the light-emitting layer EL of the second light-emitting device LD2 does not cover the area where its first electrode ANO extends to the sidewall C2 of the first groove CR1.

[0130] The display panel in the third embodiment described above increases brightness over a wide viewing angle. For in-vehicle display devices, the passenger-side panel only needs to increase brightness over a wide angle towards the driver, while there is no need to increase brightness over a wide angle towards the outside of the passenger side. The display panel in the third embodiment described above can achieve a directional increase in the amount of light emitted over a wide angle.

[0131] Furthermore, in other embodiments of this disclosure, based on the first and second embodiments, the first electrode ANO of the second light-emitting device LD2 can be disposed on the surface of the driving backplate BP in the area other than the first groove CR1, that is, the surface where the second light-emitting device LD2 is located is on the side of the middle part AN1 of the first electrode ANO of the first light-emitting device LD1 away from the substrate SU.

[0132] Furthermore, as shown in Figures 2 and 6-8, in some embodiments of this disclosure, the driving backplane BP may also include multiple support portions SL, which may be disposed on the side of the transistor layer away from the substrate SU; a support portion SL overlaps with the ramp portion AN2 of the first electrode ANO of a first light-emitting device LD1, and the orthogonal projection of a support portion SL on the substrate SU is located within the orthogonal projection of the ramp portion AN2 on the substrate SU.

[0133] The support portion SL can be located in the source / drain layer closest to the first electrode and covered by the planarization layer closest to the first electrode ANO. For example, the driving backplane BP has two source / drain layers, namely the first source / drain layer SD1 and the second source / drain layer SD2; the support portion SL is located in the second source / drain layer SD2, and the support portion SL is floating, meaning it is not connected to an electrical signal. Thus, the shape of the planarization layer corresponding to the ramp portion AN2 can be adjusted by the support portion SL, for example, making its tilt angle 30° to 70°, thereby adjusting the angle of the ramp portion AN2, which is beneficial for adjusting the wide viewing angle of the first light-emitting device LD1.

[0134] Of course, in other embodiments of this disclosure, the drive backplate may not have a support portion SL.

[0135] Second type of display panel

[0136] As shown in Figures 11-15, the surface of the driving backplate BP has multiple protrusions CP. The surface of each protrusion CP includes a top surface CP1 and a side surface CP2 surrounding the top surface CP1. The surface of the top surface CP1 and the surface of the driving backplate BP outside the protrusions CP is a flat area B1, and the side surface CP2 is a ramped area B2. The ramped area B2 gradually expands away from its flat area B1, that is, the profile of the cross section of the protrusion CP perpendicular to the driving backplate BP is trapezoidal. In some embodiments, the protrusions CP can be made of the same material as the flat layer farthest from the substrate SU, and can be formed simultaneously through exposure, development, and other processes using a halftone mask. For example, as shown in Figure 18, the planarization layer can be made using positive photoresist. The halftone mask MSK has a transparent portion MS1, a semi-transparent portion MS2, and a non-transparent portion MS3. After forming the planarization material layer using positive photoresist, the transparent portion MS1 ​​of the halftone mask MSK can be aligned with the via to be formed connecting the first electrode ANO and the source / drain layer. The non-transparent portion MS3 can be aligned with the area to be formed for the protrusion CP, and the semi-transparent portion MS2 can be aligned with other areas. After exposure and development, the area corresponding to the transparent portion MS1 ​​is removed, the area corresponding to the non-transparent portion MS3 is retained, and the area corresponding to the semi-transparent portion MS2 is thinned, thereby forming the aforementioned planarization layer and protrusion CP. In this way, a planarization layer with protrusion CP can be obtained using only one mask. Of course, it is also possible to form the planarization layer using one mask and then independently form the protrusion CP using another mask.

[0137] The area of ​​the first electrode ANO covering the top surface CP1 of the boss CP is the middle part AN1, and at least a part of the side surface CP2 covering the boss CP is the ramp part AN2. Since the ramp part AN2 covers part of the side surface CP2 and can contact the light-emitting layer EL, the first light-emitting device LD1 can also emit light corresponding to the ramp part AN2, thereby increasing the brightness at a wide viewing angle.

[0138] Furthermore, the first electrode ANO covers all sides CP2 of the protrusion CP, thereby completely encapsulating the surface of the protrusion CP and improving brightness over a wide viewing angle within a circumference of the protrusion CP. At this time, the light-emitting layer EL covers the ramp portion AN2 and can extend to the sidewall of the pixel opening PH.

[0139] The first electrode ANO of the second light-emitting device LD2 is stacked on the surface of the driving back plate BP and is spaced apart from the boss CP. That is, the boss CP is only provided at the position corresponding to the first electrode ANO of the first light-emitting device LD1, while the area corresponding to the second light-emitting device LD2 is not provided with the boss CP.

[0140] Furthermore, in some embodiments, the first electrode ANO of the first light-emitting device LD1 covers the area outside the boss CP on the surface of the driving back plate BP extending along the side CP2 of the boss CP, and covers a portion of the side CP2 of the boss CP; that is, the area covered by the first electrode ANO of the first light-emitting device LD1 is greater than the boss CP; at the same time, the area of ​​the first electrode ANO that extends beyond the boss CP can be covered by the pixel definition layer PDL, exposing only the ramp portion AN2 and the middle portion AN1.

[0141] If the first electrode ANO of the first light-emitting device LD1 covers a portion of the side CP2, the ramp portion AN2 of the first light-emitting device LD1 can also increase the brightness at a large angle in the same direction. For example, the ramp portion AN2 of the first electrode ANO of each first light-emitting device LD1 is located on the same side of its central axis AS. For example, the ramp portion AN2 of the first electrode ANO is located on the right or left side of its central axis AS, so that the first light-emitting devices LD1 of the entire display panel can increase the light output at a large angle in the same direction. In addition to covering the ramp portion AN2, the light-emitting layer EL also covers the area of ​​the side CP2 that is not covered by the ramp portion AN2, and can extend to the sidewall of the pixel opening PH.

[0142] Furthermore, as shown in Figure 14, in some embodiments of this disclosure, a pixel opening PH of the pixel definition layer PDL can expose a first electrode ANO; simultaneously, a protrusion CP can be located within a pixel opening PH that exposes the first electrode ANO of the first light-emitting device LD1, and there is a gap between it and the pixel opening PH, such that there is a gap between the side surface CP2 of the protrusion CP and the sidewall of the pixel opening PH, so that light emitted from the area corresponding to the side surface CP2 of the protrusion CP can exit from the pixel opening PH; the width of the gap is the distance between the boundary of the orthographic projection of the protrusion CP on the substrate SU and the boundary of the orthographic projection of the pixel opening PH on the substrate SU, and further, the width S of the gap can be 0.5μm-2μm.

[0143] Furthermore, as shown in Figures 12-15, in some embodiments of the third type of implementation, the surface of the driving backplate BP is provided with multiple second grooves CR2, which are spaced apart from the bosses CP. The inner surface of the second groove CR2 includes a bottom surface C3 and a side surface C4. The bottom surface C3 is a flat area B1, and the side surface C4 expands in a direction away from the bottom surface C3, so that the cross-section of the second groove CR2 contracts towards the substrate SU. The first electrode ANO of the second light-emitting device LD2 is at least partially stacked on the bottom surface C3 and at least partially on the side surface C4 of the second groove CR2. The first electrode ANO on the side surface C4 can reflect some of the large-angle light rays that illuminate it, thereby converging the light and increasing the front brightness of the second light-emitting device LD2. At the same time, the light-emitting layer EL covers the part of the first electrode ANO covered on the side surface C4, so that this area can also emit light, further increasing the front brightness of the second light-emitting device LD2. Correspondingly, the brightness of the front viewing angle in the privacy mode can be improved without affecting its privacy viewing angle. A second groove CR2 overlaps with a pixel opening PH that exposes the first electrode ANO of the second light-emitting device LD2, and the pixel opening PH is not smaller than the exposed second groove CR2.

[0144] In some embodiments, the second groove CR2 is formed on the planarization layer furthest from the substrate SU. The planarization layer and the second groove CR2 can be formed simultaneously using a halftone mask through exposure, development, and other processes. For example, as shown in Figure 19, the planarization layer can be made using positive photoresist. The halftone mask MSK has a transparent portion MS1, a semi-transparent portion MS2, and a non-transparent portion MS3. After forming the planarization material layer using positive photoresist, the transparent portion MS2 can be aligned with the via to be formed connecting the first electrode ANO and the source / drain layer, the semi-transparent portion MS2 can be aligned with the second groove CR2, and the non-transparent portion MS3 can be aligned with other areas. After exposure and development, the area corresponding to the transparent portion MS1 ​​is removed, the area corresponding to the non-transparent portion MS3 is retained, and the area corresponding to the semi-transparent portion MS2 is thinned, thereby forming the aforementioned planarization layer and the second groove CR2. In this way, a planarization layer with the second groove CR2 can be obtained using only one mask.

[0145] Furthermore, for a planar layer that simultaneously contains a boss CP and a second groove CR2, a mask with four different transparency areas can be used to form the planar layer with the boss CP and the second groove CR2 using a single mask. Alternatively, after forming the planar layer using a single mask, the boss CP and the second groove CR2 can be formed independently using two other masks.

[0146] The second groove CR2 in the third embodiment described above can be combined with the first embodiment described above. The first electrode ANO of the second light-emitting device LD2 can cover the bottom and side surfaces of the second groove CR2, and the area covering the side surface can be free from being covered by the pixel definition layer PDL. Its light-emitting range can be no less than that of the first light-emitting device LD1, and the light-emitting angle of the corresponding area of ​​the second light-emitting device LD2 can be limited by the size of the light-transmitting area LA of the light-shielding unit BU. Thus, the front brightness of the second light-emitting device LD2 can be increased.

[0147] This disclosure also provides a display device, which may include the display panel of any of the above embodiments. The specific structure and beneficial effects of the display panel can be referred to the above embodiments of the display panel, and will not be described in detail here. The display device of this disclosure may be a vehicle-mounted display device, a laptop computer or other medium to large-sized display device, or it may be used in other electronic devices with display functions such as mobile phones, which will not be listed here.

[0148] This disclosure also provides a display device that may include a plurality of display panels distributed along a specified direction, wherein some of the display panels are display panels of any of the above embodiments.

[0149] In some embodiments of this disclosure, as shown in FIG20, the display device is an in-vehicle display device, which may include a first display panel M1, a second display panel M2 and a third display panel M3. The specified direction may be the driving direction X. The first display panel M1 may be the driver's side display panel, the second display panel M2 may be the central control display panel, and the third display panel M3 may be the display panel of any of the above embodiments. Its specific structure is not specifically limited here.

[0150] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A display panel, comprising: Drive backplane; Multiple light-emitting devices are arrayed along the row and column directions on one side of the driving backplate; The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode stacked sequentially in a direction away from the driving backplate; each light-emitting device includes a first light-emitting device and a second light-emitting device; the portion of the first electrode of the first light-emitting device that contacts its light-emitting layer includes a middle portion and a ramp portion connected to the middle portion, and the ramp portion expands in a direction away from the middle portion; A light-shielding layer is disposed on the side of the light-emitting device away from the driving back plate, and includes multiple light-shielding units. The orthographic projection of the light-shielding unit on the driving back plate is located outside the orthographic projection of the first light-emitting device on the driving back plate. The light-shielding unit has a light-transmitting area, and one of the light-transmitting areas overlaps with one of the second light-emitting devices.

2. The display panel according to claim 1, wherein, The distance between the orthographic projection of the light-transmitting area of ​​the second light-emitting device and the light-shielding unit overlapping with it on the driving back plate is defined as the first distance, and the minimum distance between the orthographic projections of the first light-emitting device and the light-shielding unit on the driving back plate is defined as the second distance. If the boundary of the orthographic projection of the light-transmitting area on the driving back plate is located outside the boundary of the orthographic projection of the second light-emitting device overlapping with it on the driving back plate, the first distance is less than the second distance.

3. The display panel according to claim 1, wherein, The surface of the drive backplate has multiple flat areas and ramp areas connected to the flat areas, the ramp areas expanding in a direction away from the flat areas; The middle portion of the first electrode of the first light-emitting device is stacked in the flat region, and the sloping portion is stacked in at least a portion of the sloping region; the portion of the first electrode of the second light-emitting device that contacts its light-emitting layer is stacked in the flat region.

4. The display panel according to claim 3, wherein, The ramp portion of the first electrode of the first light-emitting device extends toward the middle portion of the side away from the driving back plate.

5. The display panel according to claim 4, wherein, The surface of the drive backplate has a plurality of first grooves, the inner surface of the first grooves including a bottom surface and a side surface, the bottom surface being the flat area and the side surface being the ramp area; the ramp area gradually expands in a direction away from its flat area; a first electrode is at least partially stacked on the inner surface of a first groove.

6. The display panel according to claim 5, wherein, The first electrode of the first light-emitting device covers the bottom surface and part of the side surface of the first groove. The area covered by the first electrode of the first light-emitting device in the middle part is the middle part, and the area covered by the side surface is the climbing part. The display panel also includes: A pixel definition layer is disposed on the surface of the driving backplate and has multiple pixel openings; one of the pixel openings exposes a first electrode; In the first light-emitting device, the pixel opening exposes the middle portion and at least part of the ramp portion of the first electrode.

7. The display panel according to claim 5, wherein, The first electrode of the first light-emitting device covers the bottom surface and the side surface of the first groove. The area of ​​the bottom surface covered by the first electrode of the first light-emitting device is the middle part, and the area of ​​the side surface partially covered is the climbing part. The display panel also includes: A pixel definition layer is disposed on the surface of the driving backplate and has multiple pixel openings; the pixel definition layer is a light-absorbing structure; one of the pixel openings exposes a first electrode; In the first light-emitting device, the middle portion and at least part of the ramp portion of the first electrode are exposed by the pixel opening, and the area outside the ramp portion in the portion covering the side is covered by the pixel definition layer.

8. The display panel according to claim 5, wherein, The first electrode of each of the light-emitting devices covers the bottom surface and the side surface of the first groove, and the area of ​​the first electrode of the first light-emitting device covering the bottom surface is the middle part, and the area covering the side surface is the climbing part; The display panel also includes: A pixel definition layer is disposed on the surface of the driving backplate and has multiple pixel openings; the pixel definition layer is a light-absorbing structure; one of the pixel openings exposes a first electrode; In the first light-emitting device, the middle portion and at least part of the ramp portion of the first electrode are exposed by the pixel opening, and the area outside the ramp portion in the region covering the side is covered by the pixel definition layer; the pixel definition layer covers the area of ​​the first electrode of the second light-emitting device that covers the side.

9. The display panel according to claim 3, wherein, The ramp portion of the first electrode of the first light-emitting device extends toward the middle portion of the drive back plate.

10. The display panel according to claim 9, wherein, The surface of the drive back plate has a plurality of protrusions, the surface of each protrusion including a top surface and a side surface surrounding the top surface, the surface of the top surface and the surface of the drive back plate other than the protrusions being the flat area, and the side surface being the climbing area; the climbing area gradually expands away from its flat area. The area of ​​the top surface of the boss covered by the first electrode of the first light-emitting device is the middle part, and the area of ​​at least a portion of the side surface of the boss is the climbing part; the first electrode of the second light-emitting device is stacked on the surface of the driving back plate and is spaced apart from the boss.

11. The display panel according to claim 10, wherein, The first electrode of the first light-emitting device covers the area outside the boss on the surface of the drive back plate extending along the side of the boss to the drive back plate, and covers a portion of the side of the boss.

12. The display panel according to any one of claims 6, 7, 8 and 11, wherein, The central axis of the light-emitting device is a straight line extending along the column direction and passing through the center of the light-emitting device; the ramp portion of the first electrode of the first light-emitting device is located on one side of the central axis, and the ramp portions of the first electrodes of multiple first light-emitting devices are located on the same side of the central axis.

13. The display panel according to any one of claims 6, 7, 8 and 11, wherein, The central axis of the light-emitting device is a straight line extending along the column direction and passing through the center of the light-emitting device; the first electrode of the first light-emitting device has the ramp portion on both sides of the central axis.

14. The display panel according to claim 10, wherein, The first electrode of the first light-emitting device covers the area outside the boss in the surface of the drive back plate that extends along the side of the boss to the drive back plate, and covers the side of the boss.

15. The display panel according to claim 10, wherein, The display panel also includes: A pixel definition layer is disposed on the surface of the driving backplate; the pixel definition layer has a plurality of pixel openings, and one of the pixel openings exposes a first electrode; a boss is located in a pixel opening that exposes the first electrode of the first light-emitting device, and there is a gap between the boss and the pixel opening.

16. The display panel according to claim 10, wherein, The surface of the drive back plate is provided with a plurality of second grooves, which are spaced apart from the boss; the inner surface of the second groove includes a bottom surface and a side surface, the bottom surface being the flat area, and the side surface expanding in a direction away from the bottom surface; The first electrode of the second light-emitting device is at least partially stacked on the bottom surface and at least partially on the side surface of the second groove.

17. The display panel according to claim 16, wherein, The display panel also includes: A pixel definition layer is disposed on the surface of the driving backplate; the pixel definition layer has a plurality of pixel openings, and one of the pixel openings exposes a first electrode; a boss is located in a pixel opening exposing the first electrode of the first light-emitting device, and there is a gap between it and the pixel opening; a second groove overlaps with a pixel opening exposing the first electrode of the second light-emitting device.

18. The display panel according to claim 1, wherein, The drive backplate includes: Substrate: A transistor layer is disposed on one side of the substrate and includes a plurality of transistors; Multiple support portions are disposed on the side of the transistor layer away from the substrate; one of the support portions overlaps with the ramp portion of the first electrode of the first light-emitting device; A planarization layer covers the support portion, and the surface of the planarization layer away from the substrate is the surface of the drive backplate.

19. The display panel according to claim 1, wherein, The light-shielding layer includes a plurality of light-shielding sub-layers distributed sequentially along a direction away from the drive back plate, and each light-shielding sub-layer is provided with a plurality of light-transmitting holes; a light-transmitting area includes a plurality of light-transmitting holes located in different light-shielding sub-layers.

20. A display device comprising the display panel according to any one of claims 1-19.

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