Display device

Abstract

A display device. The display device comprises at least one pixel unit arranged on a substrate (101), wherein the pixel unit comprises at least two sub-pixels, each of the at least two sub-pixels comprising a first electrode (11), a light-emitting functional layer (12) and a second electrode (13), which are stacked in sequence in a direction away from the substrate (101). The display device comprises a pixel definition layer (21), wherein the pixel definition layer (21) is arranged on the sides of the first electrodes (11) away from the substrate (101), the pixel definition layer (21) is provided with pixel openings (1) for defining the sub-pixels, and the pixel definition layer (21) is provided with side surfaces close to the pixel openings (1) and connected to the first electrodes (11); the light-emitting functional layers (12) at least partially cover the side surfaces of the pixel definition layer (21); and the side surfaces of the pixel definition layer (21) corresponding to the at least two sub-pixels have different slope angles.

Description

Display device Technical Field

[0001] This article relates to, but is not limited to, the field of display technology, and specifically to a display device. Background Technology

[0002] Micro-OLEDs (Micro-Organic Light-Emitting Diodes) are microdisplays that have emerged in recent years, with silicon-based OLEDs being one type. Silicon-based OLEDs not only enable active pixel addressing but also allow for the fabrication of pixel driving circuits and other structures on silicon substrates, which helps reduce system size and achieve lightweight design. Silicon-based OLEDs are fabricated using mature Complementary Metal Oxide Semiconductor (CMOS) integrated circuit technology, offering advantages such as small size, high resolution (Pixels Per Inch, PPI), and high refresh rate. They are widely used in near-eye displays for Virtual Reality (VR) and Augmented Reality (AR).

[0003] Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0005] On one hand, this disclosure provides a display device, including: at least one pixel unit disposed on a substrate, the pixel unit including at least two sub-pixels, the at least two sub-pixels including a first electrode, a light-emitting functional layer and a second electrode sequentially stacked along a direction away from the substrate;

[0006] The display device includes a pixel definition layer disposed on the side of the first electrode away from the substrate. The pixel definition layer has a pixel opening that defines the sub-pixel. The pixel opening exposes at least a portion of the corresponding first electrode. The light-emitting functional layer covers the pixel opening and is connected to the exposed first electrode.

[0007] The pixel definition layer has a side surface near the pixel opening and connected to the first electrode. The light-emitting functional layer at least partially covers the side surface of the pixel definition layer. The slope angles of the side surfaces of the pixel definition layer corresponding to the at least two sub-pixels are different from each other.

[0008] In an exemplary embodiment, the light-emitting functional layer forms a recessed region in the area corresponding to the side of the pixel definition layer, and the slope angles of the recessed regions corresponding to the sides of the pixel definition layers are different.

[0009] In an exemplary embodiment, the slope angle of the side of the pixel definition layer corresponding to at least one sub-pixel in the pixel unit is greater than or equal to 30° and less than or equal to 60°, and the slope angle of the side of the pixel definition layer corresponding to at least one sub-pixel in the pixel unit is greater than 60° and less than or equal to 90°.

[0010] In an exemplary embodiment, the light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the pixel unit includes a first sub-pixel group and a second sub-pixel group, the first sub-pixel group includes at least one sub-pixel, the color of the light emitted by the first light-emitting unit includes the color of the light emitted by the sub-pixel of the first sub-pixel group, the side of the pixel definition layer corresponding to the sub-pixel of the first sub-pixel group has a first slope angle, the second sub-pixel group includes at least one sub-pixel, the color of the light emitted by the second light-emitting unit includes the color of the light emitted by the sub-pixel of the second sub-pixel group, the side of the pixel definition layer corresponding to the sub-pixel of the second sub-pixel group has a second slope angle, the second slope angle being greater than the first slope angle.

[0011] In an exemplary embodiment, the difference between the second slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°.

[0012] In an exemplary embodiment, the first slope angle is greater than or equal to 30° and less than or equal to 60°, and the second slope angle is greater than 60° and less than or equal to 90°.

[0013] In an exemplary embodiment, each light-emitting functional layer includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit stacked sequentially along a direction away from the substrate, and a first charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit, and a second charge-generating layer disposed between the second light-emitting unit and the third light-emitting unit; each pixel unit includes a first sub-pixel group, a second sub-pixel group, and a third sub-pixel group, wherein the first sub-pixel group includes at least one sub-pixel, the color of the light emitted by the first light-emitting unit includes the color of the light emitted by the sub-pixel of the first sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the first sub-pixel group has a first slope angle; the second sub-pixel group includes at least one sub-pixel, the color of the light emitted by the second light-emitting unit includes the color of the light emitted by the sub-pixel of the second sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the second sub-pixel group has a second slope angle; the third sub-pixel group includes at least one sub-pixel, the color of the light emitted by the third light-emitting unit includes the color of the light emitted by the sub-pixel of the third sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the third sub-pixel group has a third slope angle, the third slope angle being greater than the first slope angle, and the second slope angle being greater than the first slope angle.

[0014] In an exemplary embodiment, the difference between the third slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°, and the difference between the second slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°.

[0015] In an exemplary embodiment, the first slope angle is greater than or equal to 30° and less than or equal to 60°, the second slope angle is greater than 60° and less than or equal to 90°, and the third slope angle is greater than 60° and less than or equal to 90°.

[0016] In an exemplary embodiment, the pixel unit includes a first sub-pixel emitting a first color light, a second sub-pixel emitting a second color light, and a third sub-pixel emitting a third color light. The light-emitting functional layers in the first, second, and third sub-pixels each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first and second light-emitting units. The color of the light emitted by the first light-emitting unit includes the first color and the second color; the color of the light emitted by the second light-emitting unit includes the third color; the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than or equal to 30° and less than or equal to 60°; the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than or equal to 30° and less than or equal to 60°; and the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than 60° and less than or equal to 90°.

[0017] In an exemplary embodiment, the pixel unit includes a first sub-pixel emitting a first color light, a second sub-pixel emitting a second color light, and a third sub-pixel emitting a third color light. The light-emitting functional layers in the first, second, and third sub-pixels each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first and second light-emitting units. The color of the light emitted by the first light-emitting unit includes the third color, the color of the light emitted by the second light-emitting unit includes both the first and second colors, the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than 60° and less than or equal to 90°, the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than 60° and less than or equal to 90°, and the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than or equal to 30° and less than or equal to 60°.

[0018] In an exemplary embodiment, the light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the surface of the charge-generating layer away from the substrate forms a first recessed region in the corresponding region of the side of the pixel definition layer, the end of the first recessed region near the middle region of the sub-pixel is connected to a first flat surface, the first flat surface is parallel to the substrate, the end of the first recessed region away from the middle region of the sub-pixel is connected to a first protrusion, and the slope angle of the side of the first recessed region away from the first flat surface is greater than or equal to 30° and less than or equal to 60°.

[0019] In an exemplary embodiment, the vertical distance from the lowest point of the first recessed region to the first flat surface is greater than or equal to 4 angstroms and less than or equal to 9 angstroms.

[0020] In an exemplary embodiment, the light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the surface of the charge-generating layer away from the substrate forms a first recessed region in the corresponding region of the side of the pixel definition layer, the end of the first recessed region near the middle region of the sub-pixel is connected to a first flat surface, the first flat surface is parallel to the substrate, the end of the first recessed region away from the middle region of the sub-pixel is connected to a first protrusion, and the slope angle of the side of the first recessed region away from the first flat surface is greater than 60° and less than or equal to 90°.

[0021] In an exemplary embodiment, the vertical distance from the lowest point of the first recessed region to the first flat surface is greater than 9 angstroms and less than or equal to 14 angstroms.

[0022] In an exemplary embodiment, the light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the first light-emitting unit includes a first light-emitting layer, and the surface of the first light-emitting layer away from the substrate forms a second recessed region in the corresponding region of the side of the pixel definition layer, the end of the second recessed region near the middle region of the sub-pixel is connected to a second flat surface, the second flat surface is parallel to the substrate, the end of the second recessed region away from the middle region of the sub-pixel is connected to a second protrusion, and the slope angle of the side of the second recessed region away from the second flat surface is greater than or equal to 30° and less than or equal to 60°.

[0023] In an exemplary embodiment, the vertical distance from the lowest point of the second recessed region to the second flat surface is greater than or equal to 30 angstroms and less than or equal to 80 angstroms.

[0024] In an exemplary embodiment, the minimum distance from the lowest point of the second recessed region to the edge of the second flat surface is greater than or equal to 30 angstroms and less than or equal to 100 angstroms.

[0025] In an exemplary embodiment, the light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the first light-emitting unit includes a first light-emitting layer, and the surface of the first light-emitting layer away from the substrate forms a second recessed region in the corresponding region of the side of the pixel definition layer, the end of the second recessed region near the middle region of the sub-pixel is connected to a second flat surface, the second flat surface is parallel to the substrate, the end of the second recessed region away from the middle region of the sub-pixel is connected to a second protrusion, and the slope angle of the side of the second recessed region away from the second flat surface is greater than 60° and less than or equal to 90°.

[0026] In an exemplary embodiment, the vertical distance from the lowest point of the second recessed region to the second flat surface is greater than 80 angstroms and less than or equal to 120 angstroms.

[0027] In an exemplary embodiment, the minimum distance from the lowest point of the second recessed region to the edge of the second flat surface is greater than or equal to 100 angstroms and less than or equal to 300 angstroms.

[0028] In an exemplary embodiment, the light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the second light-emitting unit includes a second light-emitting layer, and the surface of the second light-emitting layer away from the substrate forms a third recessed region in the corresponding region of the side of the pixel definition layer, the end of the third recessed region near the middle region of the sub-pixel is connected to a third flat surface, the third flat surface is parallel to the substrate, the end of the third recessed region away from the middle region of the sub-pixel is connected to a third protrusion, and the slope angle of the side of the third recessed region away from the third flat surface is greater than or equal to 30° and less than or equal to 60°.

[0029] In an exemplary embodiment, the vertical distance from the lowest point of the third recessed region to the third flat surface is greater than or equal to 60 angstroms and less than or equal to 70 angstroms.

[0030] In an exemplary embodiment, the minimum distance from the lowest point of the third recessed region to the edge of the third flat surface is greater than or equal to 100 angstroms and less than or equal to 300 angstroms.

[0031] In an exemplary embodiment, the light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the second light-emitting unit includes a second light-emitting layer, and the surface of the second light-emitting layer away from the substrate forms a third recessed region in the corresponding region of the side of the pixel definition layer, the end of the third recessed region near the middle region of the sub-pixel is connected to a third flat surface, the third flat surface is parallel to the substrate, the end of the third recessed region away from the middle region of the sub-pixel is connected to a third protrusion, and the slope angle of the side of the third recessed region away from the third flat surface is greater than 60° and less than or equal to 90°.

[0032] In an exemplary embodiment, the vertical distance from the lowest point of the third recessed region to the third flat surface is greater than 70 angstroms and less than or equal to 80 angstroms.

[0033] In an exemplary embodiment, the minimum distance from the lowest point of the third recessed region to the edge of the third flat surface is less than 100 angstroms.

[0034] In an exemplary embodiment, the pixel definition layer includes a first definition layer, a second definition layer, and a third definition layer stacked sequentially along a direction away from the substrate. The first definition layer has a first side surface near the pixel opening, the second definition layer has a second side surface near the pixel opening, and the third definition layer has a third side surface near the pixel opening. The first side surface is connected to the first electrode and extends relative to the second and third side surfaces, respectively. The side surface of the pixel definition layer includes the first side surface, the second side surface, and the third side surface. The angle formed between the first side surface and the plane where the substrate is located forms the slope angle of the side surface of the pixel definition layer.

[0035] In an exemplary embodiment, the third side extends relative to the second side, and the third side and the second side form an undercut structure, with at least a portion of the film layer in the light-emitting functional layer being separated at the undercut structure.

[0036] In an exemplary embodiment, the first electrode includes a first conductive layer, a second conductive layer, and a third conductive layer stacked sequentially along a direction perpendicular to the substrate.

[0037] In an exemplary embodiment, the first electrode further includes an electrode insulating layer disposed between the second conductive layer and the third conductive layer, wherein a via is provided in the electrode insulating layer, and the third conductive layer is connected to the second conductive layer through the via.

[0038] In an exemplary embodiment, the pixel unit includes a first sub-pixel emitting a first color light, a second sub-pixel emitting a second color light, and a third sub-pixel emitting a third color light. The vertical distance from the first electrode of the third sub-pixel away from the substrate side surface to the substrate surface is greater than the vertical distance from the first electrode of the first sub-pixel away from the substrate side surface to the substrate surface. The vertical distance from the first electrode of the first sub-pixel away from the substrate side surface to the substrate surface is greater than the vertical distance from the first electrode of the second sub-pixel away from the substrate side surface to the substrate surface.

[0039] In an exemplary embodiment, the light-emitting functional layers in the first sub-pixel, the second sub-pixel, and the third sub-pixel each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the color of the light emitted by the first light-emitting unit includes the first color and the second color, the color of the light emitted by the second light-emitting unit includes the third color, the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel, and the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel;

[0040] Alternatively, the light-emitting functional layers in the first sub-pixel, the second sub-pixel, and the third sub-pixel each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the color of the light emitted by the first light-emitting unit includes the third color, the color of the light emitted by the second light-emitting unit includes the first color and the second color, the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel, and the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel.

[0041] In an exemplary embodiment, the thickness of the electrode insulating layer of the first electrode of the third sub-pixel is greater than the thickness of the electrode insulating layer of the first electrode of the first sub-pixel, and the thickness of the electrode insulating layer of the first electrode of the first sub-pixel is greater than the thickness of the electrode insulating layer of the first electrode of the second sub-pixel.

[0042] In an exemplary embodiment, the pixel definition layer is provided with a partition slot located between adjacent pixel openings.

[0043] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0044] The accompanying drawings are used to provide an understanding of 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.

[0045] Figure 1 is a schematic diagram of a display device;

[0046] Figure 2 is a schematic diagram of the planar structure of a display device;

[0047] Figure 3 is a schematic diagram of the planar structure of the display area in a display device;

[0048] Figure 4 is a schematic cross-sectional view of the display area of ​​a display device;

[0049] Figure 5 is a schematic diagram of the planar structure of the display device according to an embodiment of the present disclosure;

[0050] Figure 6 is a cross-sectional structural diagram of the edge region of a sub-pixel in a pixel unit of a display device according to an embodiment of the present disclosure;

[0051] Figure 7 is a cross-sectional schematic diagram of the pixel definition layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure;

[0052] Figure 8 is a schematic cross-sectional view of the first light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure.

[0053] Figure 9 is a schematic cross-sectional view of the charge generation layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure.

[0054] Figure 10 is a schematic cross-sectional view of the second light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure.

[0055] Figure 11 is a schematic cross-sectional view of the edge region of another sub-pixel in the pixel unit of the display device according to an embodiment of the present disclosure;

[0056] Figure 12 is a schematic cross-sectional view of the pixel definition layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure.

[0057] Figure 13 is a schematic cross-sectional view of the first light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure.

[0058] Figure 14 is a schematic cross-sectional view of the charge generation layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure.

[0059] Figure 15 is a schematic cross-sectional view of the second light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure.

[0060] Figure 16 is a graph showing the slope angle of the side of the pixel definition layer and the thickness of the first light-emitting layer in the display device of the present disclosure embodiment;

[0061] Figure 17 is a graph showing the slope angle of the side of the pixel definition layer and the depth of the first recessed region of the charge generation layer in the display device of the present disclosure embodiment.

[0062] Figure 18 is a graph showing the slope angle of the side of the pixel definition layer and the width of the third recessed area of ​​the second light-emitting layer in the display device of the present disclosure embodiment;

[0063] Figure 19 is a schematic cross-sectional view of the first electrode in the display device according to an embodiment of the present disclosure;

[0064] Figure 20 is a cross-sectional structural diagram of the pixel definition layer in the display device according to an embodiment of the present disclosure. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this disclosure clearer, embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Note that the implementation methods can be carried out in many different forms. Those skilled in the art will readily understand that the methods and content can be varied in various forms without departing from the spirit and scope of this disclosure. Therefore, this disclosure should not be construed as limited to the content described in the following embodiments. Without conflict, the embodiments and features in the embodiments of this disclosure can be arbitrarily combined with each other.

[0066] The scale of the accompanying drawings in this disclosure can be used as a reference in actual processes, but is not limited thereto. For example, the aspect ratio of the channel, the thickness and spacing of each film layer, and the width and spacing of each signal line can be adjusted according to actual needs. The number of pixels in the display device and the number of sub-pixels in each pixel are not limited to the quantities shown in the figures. The accompanying drawings described in this disclosure are only structural schematic diagrams, and one aspect of this disclosure is not limited to the shapes or values ​​shown in the figures.

[0067] The ordinal numbers “first,” “second,” and “third” used in this specification are used to avoid confusion among the constituent elements, not to limit their quantity.

[0068] In this specification, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification, and does not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately varied depending on the orientation of each constituent element being described. Therefore, the use of terms not limited to those described in the specification may be appropriately replaced as needed.

[0069] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the specific meaning of these terms in this disclosure based on the specific circumstances.

[0070] In this specification, a transistor is a device that includes at least three terminals: a gate electrode, a drain electrode, and a source electrode. A transistor has a channel region between the drain electrode (drain electrode terminal, drain region, or drain electrode) and the source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, the channel region refers to the region through which current primarily flows.

[0071] In this specification, the first electrode can be the drain electrode and the second electrode can be the source electrode, or vice versa. In cases where transistors with opposite polarities are used or the current direction changes during circuit operation, the functions of the "source electrode" and "drain electrode" may sometimes be interchanged. Therefore, in this specification, the "source electrode" and "drain electrode" can be interchanged, and the "source terminal" and "drain terminal" can be interchanged.

[0072] In this specification, "electrical connection" includes the situation where components are connected together by elements that have a certain electrical function. There are no particular limitations on what constitutes an "electrical function," as long as it allows for the transmission and reception of electrical signals between the connected components. Examples of "electrical functions" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements with various functions.

[0073] 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°.

[0074] In this specification, the terms "film" and "layer" may be interchanged. For example, "conductive layer" may sometimes be replaced with "conductive film." Similarly, "insulating film" may sometimes be replaced with "insulating layer."

[0075] 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.

[0076] In this disclosure, “about” means a value that is not strictly limited and allows for process and measurement errors.

[0077] Silicon-based OLED displays use integrated circuits to control the OLED light-emitting devices, which significantly increases the resolution of the display (typically reaching over 3000 ppi). However, this also presents a significant challenge to OLED displays: traditional fine metal masks (FMMs) can only achieve a maximum of around 800 ppi. This means that silicon-based OLED displays cannot easily use a side-by-side (SBS) approach for depositing the light-emitting layer and other organic layers. Full-area OLED deposition has become almost inevitable in the field of silicon-based OLED displays, necessitating the use of other methods to separate OLED pixels.

[0078] Because silicon-based OLED displays cannot be manufactured with separate RGB monochrome SBS devices like those in mobile phones, they can only use white light devices. Some silicon-based OLED displays use a single-emitting-layer structure to achieve white light emission. The light-emitting device architecture uses a combination of different light-emitting materials to achieve white light, and the module brightness is generally between 80 nits and 600 nits, which is considered a low-to-medium brightness display. If this single-layer structure were used to achieve high brightness (greater than 1000 nits), power consumption and lifespan would be sacrificed, but the production bottleneck for this type of device is relatively low. To improve the performance, brightness, and lifespan of silicon-based OLED displays, tandem OLED devices with at least two emitting layers have been introduced. A charge generation layer (CGL) is used to connect two light-emitting units in series, achieving a superimposed light emission effect on the device. This successfully improves important optoelectronic properties such as current efficiency, output brightness, and operating lifespan.

[0079] Through the research of the inventors of this disclosure, it has been found that the pixel definition layer is provided with a pixel opening that defines a sub-pixel, and the stacked light-emitting functional layer including at least two light-emitting layers covers the side of the pixel definition layer near the pixel opening. The slope angle of the side of the pixel definition layer will affect the morphology of the two light-emitting layers corresponding to the side of the pixel definition layer, which can easily lead to distortion of the morphology of the light-emitting layers and cause low grayscale light leakage in the display device.

[0080] This disclosure provides a display device, including: at least one pixel unit disposed on a substrate, the pixel unit including at least two sub-pixels, the at least two sub-pixels including a first electrode, a light-emitting functional layer and a second electrode sequentially stacked along a direction away from the substrate;

[0081] The display device includes a pixel definition layer disposed on the side of the first electrode away from the substrate. The pixel definition layer has a pixel opening that defines the sub-pixel. The pixel opening exposes at least a portion of the corresponding first electrode. The light-emitting functional layer covers the pixel opening and is connected to the exposed first electrode.

[0082] The pixel definition layer has a side surface near the pixel opening and connected to the first electrode. The light-emitting functional layer at least partially covers the side surface of the pixel definition layer. The slope angles of the side surfaces of the pixel definition layer corresponding to the at least two sub-pixels are different from each other.

[0083] The display device of this disclosure controls the morphology of the light-emitting functional layer corresponding to the side of the pixel definition layer with different slope angles for different sub-pixels, thereby reducing the distortion of the morphology of the light-emitting layer emitting light of the same color as the sub-pixel, avoiding low grayscale light leakage, and improving the consistency of high and low grayscale of the display device.

[0084] Figure 1 is a schematic diagram of a display device. As shown in Figure 1, the display device may include: a timing controller, a data driver, a scan driver, a light-emitting driver, and a pixel array. The timing controller is connected to the data driver, the scan driver, and the light-emitting driver. The data driver is connected to multiple data signal lines (e.g., D1 to Dn), the scan driver is connected to multiple scan signal lines (e.g., S1 to Sm), and the light-emitting driver is connected to multiple light-emitting control lines (e.g., E1 to Eo). Here, n, m, and o can be natural numbers. The pixel array may include at least two sub-pixels Pxij, where i and j can be natural numbers. At least one sub-pixel Pxij may include: a pixel circuit and a light-emitting device connected to the pixel circuit. The pixel circuit may be connected to the scan signal lines, the light-emitting control lines, and the data signal lines, respectively.

[0085] In some exemplary embodiments, the timing controller can provide grayscale values ​​and control signals suitable for the specifications of the data driver to the data driver, clock signals, scan start signals, etc. suitable for the specifications of the scan driver to the scan driver, and clock signals, transmit stop signals, etc. suitable for the specifications of the light-emitting driver to the light-emitting driver. The data driver can use the grayscale values ​​and control signals received from the timing controller to generate data voltages to be provided to the data signal lines D1, D2, D3, ..., Dn. For example, the data driver can sample the grayscale values ​​using a clock signal and apply the data voltage corresponding to the grayscale values ​​to the data signal lines D1 to Dn on a pixel-by-pixel basis. The scan driver can generate scan signals to be provided to the scan signal lines S1, S2, S3, ..., Sm by receiving clock signals, scan start signals, etc. from the timing controller. For example, the scan driver can sequentially provide scan signals with on-level pulses to the scan signal lines S1 to Sm. For example, a scan driver can be configured as a shift register and can generate scan signals by sequentially transmitting scan start signals, provided in the form of on-level pulses, to the next stage circuit under the control of a clock signal. An LED driver can generate LED control signals to be provided to LED control lines E1, E2, E3, ..., Eo by receiving clock signals, transmit stop signals, etc., from a timing controller. For example, an LED driver can sequentially provide transmit signals with off-level pulses to LED control lines E1 to Eo. For example, an LED driver can be configured as a shift register and can generate LED control signals by sequentially transmitting transmit stop signals, provided in the form of off-level pulses, to the next stage circuit under the control of a clock signal.

[0086] Figure 2 is a schematic diagram of a planar structure of a display device. As shown in Figure 2, the display device may include a display area 100 and a dummy area 300 located outside the display area 100, parallel to the plane of the display device. In an exemplary embodiment, the display area 100 is the effective area (AA) for image display, and may include at least two sub-pixels forming a pixel array. The sub-pixels may include pixel driving circuitry and display light-emitting devices, and the at least two sub-pixels are configured to display dynamic or still images. In an exemplary embodiment, the dummy area 300 is located outside the display area 100 and may include multiple dummy light-emitting devices. The multiple dummy light-emitting devices are configured to present the shape of the display light-emitting devices but do not display images.

[0087] In an exemplary embodiment, the display device may further include a transition region 200, which may be located between the display region 100 and the dummy region 300, i.e., the transition region 200 is located on the periphery of the display region 100, and the dummy region 300 is located on the periphery of the transition region 200. In an exemplary embodiment, the transition region 200 may include a plurality of transition light-emitting devices, which are configured to present the shape of the display light-emitting device but do not display an image.

[0088] In an exemplary embodiment, the dummy region 300 may include corresponding signal lines configured to transmit the required signals to the display area. The transition region 200 may include corresponding sensors configured to sense parameters such as temperature and brightness, which are not limited herein.

[0089] Figure 3 is a schematic diagram of the planar structure of a display area in a display device. As shown in Figure 3, the display area may include multiple pixel units P arranged in a matrix. At least one of the multiple pixel units P includes a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. Each of the first sub-pixel P1, second sub-pixel P2, and third sub-pixel P3 includes a pixel driving circuit and a light-emitting device. The pixel driving circuit in the sub-pixel is connected to a scan signal line and a data signal line, respectively. The pixel driving circuit is configured to receive the data voltage transmitted by the data signal line under the control of the scan signal line and output a corresponding current to the display light-emitting device. The display light-emitting device in the sub-pixel is connected to the pixel driving circuit of its respective sub-pixel. The display light-emitting device is configured to emit light of a corresponding brightness in response to the current output by the pixel driving circuit of its respective sub-pixel.

[0090] In an exemplary embodiment, the first sub-pixel P1 can be a red sub-pixel emitting red (R) light, the second sub-pixel P2 can be a green sub-pixel emitting green (G) light, and the third sub-pixel P3 can be a blue sub-pixel emitting blue (B) light. In an exemplary embodiment, the shape of the sub-pixels can be any one or more of triangles, squares, rectangles, rhombuses, trapezoids, parallelograms, pentagons, hexagons, and other polygons, and they can be arranged in horizontal parallel, vertical parallel, X-shaped, cross-shaped, triangular, square, diamond-shaped, or delta-shaped arrangements, etc., without limitation herein.

[0091] In an exemplary embodiment, a pixel unit may include four sub-pixels, which is not limited herein.

[0092] Figure 4 is a schematic cross-sectional view of the display area of ​​a display device, wherein Figure 4 can be a cross-sectional view along the A-A' direction in Figure 3. The display device shown in Figure 4 is a structure that achieves full color using a white light + color filter method. As shown in Figure 4, in the direction perpendicular to the display device, the display device may include: a substrate 101, a driving circuit layer 102 disposed on the substrate 101, a light-emitting structure layer 103 disposed on the side of the driving circuit layer 102 away from the substrate 101, a first encapsulation layer 104 disposed on the side of the light-emitting structure layer 103 away from the substrate 101, a color filter structure layer 105 disposed on the side of the first encapsulation layer 104 away from the substrate 101, a second encapsulation layer 106 disposed on the side of the color filter structure layer 105 away from the substrate 101, and a cover plate layer 107 disposed on the side of the second encapsulation layer 106 away from the substrate 101. In some possible implementations, the display device may include other film layers, such as touch film layers, etc., which are not limited herein.

[0093] In an exemplary embodiment, the substrate 101 can be a bulk substrate or a silicon-on-insulator (SOI) substrate. The driving circuit layer 102 can be fabricated on the substrate 101 using silicon semiconductor processes (e.g., CMOS processes). The driving circuit layer 102 can include multiple circuit units, each of which can include at least a pixel driving circuit. The pixel driving circuit is connected to scan signal lines and data signal lines, respectively. The pixel driving circuit can include multiple transistors and storage capacitors; only one transistor is shown as an example in Figure 4. The transistor can include a control electrode G, a first electrode S, and a second electrode D. The control electrode G, the first electrode S, and the second electrode D can be connected to corresponding connection electrodes via tungsten-filled vias (i.e., tungsten vias, W-vias), and can be connected to other electrical structures (such as traces) via the connection electrodes.

[0094] In an exemplary embodiment, the light-emitting structure layer 103 may include multiple light-emitting devices. Each light-emitting device may include at least a first electrode, a light-emitting functional layer, and a second electrode. The first electrode is connected to the second electrode D of a transistor via a connecting electrode. The light-emitting functional layer is connected to the first electrode, and the second electrode is connected to the light-emitting functional layer and a voltage line. The light-emitting functional layer emits light under the drive of the first and second electrodes. In an exemplary embodiment, the light-emitting functional layer may include at least one light-emitting unit. The at least one light-emitting unit may include a light-emitting layer (EML) and any one or more of the following: a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL). In an exemplary embodiment, for a light-emitting device emitting white light, some film layers in the light-emitting functional layers of all sub-pixels may be common layers connected together, such as the second electrode.

[0095] In an exemplary embodiment, the light-emitting device can be a tandem light-emitting device that emits white light. The light-emitting functional layer of the tandem light-emitting device includes at least two light-emitting units stacked and connected in series along the direction perpendicular to the substrate. A charge generation layer is provided between two adjacent light-emitting units. The charge generation layer generates holes and electrons under the voltage of the first electrode and the second electrode.

[0096] In an exemplary embodiment, the first encapsulation layer 104 and the second encapsulation layer 106 can be thin film encapsulation (TFE) to ensure that external moisture cannot enter the light-emitting structure layer. The cover layer 107 can be made of glass or a flexible plastic such as colorless polyimide.

[0097] In an exemplary embodiment, the color filter structure layer 105 may include a black matrix (BM) and a color filter (CF). The position of the color filter may correspond to the position of the light-emitting device. The black matrix may be located between adjacent color filters. The color filters are configured to filter the white light emitted by the light-emitting device into red (R) light, green (G) light, and blue (B) light, forming red sub-pixels, green sub-pixels, and blue sub-pixels.

[0098] Figure 5 is a schematic diagram of the planar structure of the display device according to an embodiment of the present disclosure. As shown in Figure 5, the display device according to an embodiment of the present disclosure may include a plurality of pixel units P arranged in a matrix on a substrate. At least one of the plurality of pixel units P includes a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, a third sub-pixel P3 emitting a third color light, and a non-sub-pixel area 10 located between adjacent sub-pixels. The first sub-pixel P1 may be a red sub-pixel emitting red (R) light, the second sub-pixel P2 may be a green sub-pixel emitting green (G) light, and the third sub-pixel P3 may be a blue sub-pixel emitting blue (B) light. The first sub-pixel P1, the third sub-pixel P3, and the second sub-pixel P2 are arranged at intervals along a first direction D1. The orthographic projections of the first sub-pixel P1, the third sub-pixel P3, and the second sub-pixel P2 on the substrate are all hexagonal. In some embodiments, the shape of the sub-pixels can be any one or more of triangles, squares, rectangles, rhombuses, trapezoids, parallelograms, pentagons and other polygons, and can be arranged in a vertical parallel, X-shaped, cross-shaped, triangular, square, diamond-shaped or delta-shaped manner, etc., which are not limited in this disclosure.

[0099] In an exemplary embodiment, the display device of this disclosure further includes a pixel definition layer. The pixel definition layer is provided with at least two pixel openings, each corresponding to at least two sub-pixels. Each pixel opening defines a corresponding sub-pixel, and the area defined by the pixel opening is the area of ​​the corresponding sub-pixel. For example, the pixel definition layer includes a first pixel opening 1-1, a second pixel opening 1-2, and a third pixel opening 1-3. The first pixel opening 1-1 defines a first sub-pixel P1, the second pixel opening 1-2 defines a second sub-pixel P2, and the third pixel opening 1-3 defines a third sub-pixel P3.

[0100] In an exemplary embodiment, each sub-pixel in the pixel unit is a stacked device with dual light-emitting layers.

[0101] In an exemplary embodiment, the pixel unit includes a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. The first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 are all stacked devices with a dual-emitting layer consisting of a yellow emitting layer (Y layer) and a blue emitting layer (B layer). Specifically, each of the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 includes a first electrode, a light-emitting functional layer, and a second electrode, sequentially stacked along a direction away from the substrate. The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit. The color of the light emitted by the first light-emitting unit of each sub-pixel's light-emitting functional layer includes both the first and second color light, i.e., yellow light, and the color of the light emitted by the second light-emitting unit of each sub-pixel's light-emitting functional layer includes the third color light, i.e., blue light. The pixel unit includes a first sub-pixel group and a second sub-pixel group. The first sub-pixel group may include a first sub-pixel P1 and a second sub-pixel P2. The second sub-pixel group may include a third sub-pixel P3. The side of the pixel definition layer corresponding to the first sub-pixel P1 and the second sub-pixel P2 of the first sub-pixel group has a first slope angle. The side of the pixel definition layer corresponding to the third sub-pixel P3 of the second sub-pixel group has a second slope angle. The second slope angle is greater than the first slope angle.

[0102] In an exemplary embodiment, the difference between the second slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°.

[0103] In an exemplary embodiment, the first slope angle is greater than or equal to 30° and less than or equal to 60°, and the second slope angle is greater than 60° and less than or equal to 90°.

[0104] In an exemplary embodiment, the pixel unit includes a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. The first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 are all stacked devices with a blue light-emitting layer (B layer) and a yellow light-emitting layer (Y layer). Specifically, each of the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked along a direction away from the substrate. The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit sequentially stacked along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit. The color of the light emitted by the first light-emitting unit of each sub-pixel's light-emitting functional layer includes the third color light, i.e., blue light, and the color of the light emitted by the second light-emitting unit of each sub-pixel's light-emitting functional layer includes both the first color light and the second color light, i.e., yellow light. The pixel unit includes a first sub-pixel group and a second sub-pixel group. The first sub-pixel group may include a third sub-pixel P3, and the second sub-pixel group may include a first sub-pixel P1 and a second sub-pixel P2. The side of the pixel definition layer corresponding to the third sub-pixel P3 of the first sub-pixel group has a first slope angle, and the side of the pixel definition layer corresponding to the first sub-pixel P1 and the second sub-pixel P2 of the second sub-pixel group has a second slope angle, which is greater than the first slope angle.

[0105] In an exemplary embodiment, the difference between the second slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°.

[0106] In an exemplary embodiment, the first slope angle is greater than or equal to 30° and less than or equal to 60°, and the second slope angle is greater than 60° and less than or equal to 90°.

[0107] In an exemplary embodiment, each sub-pixel in the pixel unit is a stacked device with three light-emitting layers.

[0108] In an exemplary embodiment, each sub-pixel in the pixel unit includes a first electrode, a light-emitting functional layer, and a second electrode that are sequentially stacked along a direction away from the substrate. Each sub-pixel's light-emitting functional layer includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit stacked sequentially along a direction away from the substrate, and a first charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit, and a second charge-generating layer disposed between the second light-emitting unit and the third light-emitting unit; the pixel unit includes a first sub-pixel group, a second sub-pixel group, and a third sub-pixel group, the first sub-pixel group including at least one sub-pixel, the color of the light emitted by the first light-emitting unit including the color of the light emitted by the sub-pixel of the first sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the first sub-pixel group having a first slope angle; the second sub-pixel group including at least one sub-pixel, the color of the light emitted by the second light-emitting unit including the color of the light emitted by the sub-pixel of the second sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the second sub-pixel group having a second slope angle; the third sub-pixel group including at least one sub-pixel, the color of the light emitted by the third light-emitting unit including the color of the light emitted by the sub-pixel of the third sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the third sub-pixel group having a third slope angle, the third slope angle being greater than the first slope angle, and the second slope angle being greater than the first slope angle.

[0109] In an exemplary embodiment, the difference between the third slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°, and the difference between the second slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°.

[0110] In an exemplary embodiment, the first slope angle is greater than or equal to 30° and less than or equal to 60°, the second slope angle is greater than 60° and less than or equal to 90°, and the third slope angle is greater than 60° and less than or equal to 90°.

[0111] Figure 6 is a cross-sectional view of the edge region of a sub-pixel in a pixel unit of a display device according to an embodiment of the present disclosure. In an exemplary embodiment, as shown in Figure 6, the pixel unit of the display device according to an embodiment of the present disclosure includes at least two sub-pixels 20 and a non-sub-pixel region 10 located between adjacent sub-pixels 20. The sub-pixels 20 of the pixel unit are stacked devices with dual light-emitting layers. In a direction perpendicular to the display device, a sub-pixel 20 in the pixel unit may include a driving circuit layer 102 disposed on a substrate 101, a first insulating layer 14 disposed on the side of the driving circuit layer 102 away from the substrate 101, a second insulating layer 15 disposed on the side of the first insulating layer 14 away from the substrate 101, and a light-emitting structure layer disposed on the side of the second insulating layer 15 away from the substrate 101. The light-emitting structure layer includes a first electrode 11 disposed on the side of the second insulating layer 15 away from the substrate 101, a light-emitting functional layer 12 disposed on the side of the first electrode 11 away from the substrate 101, and a second electrode 13 disposed on the side of the light-emitting functional layer 12 away from the substrate 101. The first insulating layer 14 includes silicon oxide, and the second insulating layer 15 includes silicon nitride.

[0112] In an exemplary embodiment, the pixel density of the display device in this disclosure is greater than or equal to 2000ppi.

[0113] In an exemplary embodiment, the display device of this disclosure further includes a pixel definition layer 21, which is located in the non-sub-pixel region 10. The pixel definition layer 21 is disposed on the side of the first electrode 11 away from the substrate 101. The pixel definition layer 21 is provided with a pixel opening 1 that defines a sub-pixel. The pixel opening 1 exposes at least a portion of the first electrode 11. The light-emitting functional layer 12 covers the pixel opening 1 and contacts the first electrode 11 exposed by the pixel opening 1.

[0114] In an exemplary embodiment, the light-emitting functional layer 12 may include a first light-emitting unit 12-1 and a second light-emitting unit 12-2 stacked sequentially along a direction away from the substrate 101, and a charge-generating layer 30 disposed between the first light-emitting unit 12-1 and the second light-emitting unit 12-2.

[0115] In an exemplary embodiment, the first light-emitting unit 12-1 is located on the side of the second light-emitting unit 12-2 near the substrate, and is connected in series with the second light-emitting unit 12-2 through the charge generation layer 30.

[0116] The display device in this embodiment achieves the effect of emitting white light by superimposing the light emitted from the first light-emitting unit 12-1 and the light emitted from the second light-emitting unit 12-2.

[0117] In an exemplary embodiment, the first light-emitting unit 12-1 may include a first auxiliary layer 41, a first light-emitting layer 31, and a second auxiliary layer 42 stacked sequentially along a direction away from the substrate 101. The first auxiliary layer 41 may include any one or more of the following: a first hole injection layer (HIL) and a first hole transport layer (HTL). The second auxiliary layer 42 may include any one or more of the following: a first electron transport layer (ETL), a first electron injection layer (EIL), and a first hole blocking layer (HBL).

[0118] In an exemplary embodiment, the second light-emitting unit 12-2 may include a third auxiliary layer 43, a second light-emitting layer 32, and a fourth auxiliary layer 44 stacked sequentially along a direction away from the substrate 101. The third auxiliary layer 43 may include any one or more of the following: a second hole injection layer (HIL) and a second hole transport layer (HTL). The fourth auxiliary layer 44 may include any one or more of the following: a second electron transport layer (ETL), a second electron injection layer (EIL), and a second hole blocking layer (HBL).

[0119] In an exemplary embodiment, the first electrode 11 may include a first conductive layer 11-1, a second conductive layer 11-2, and a third conductive layer 11-3 stacked sequentially along a direction perpendicular to the substrate. The first conductive layer 11-1 is disposed on the side of the second insulating layer 15 away from the substrate 101; the second conductive layer 11-2 is disposed on the side of the first conductive layer 11-1 away from the substrate 101 and is in contact with the first conductive layer 11-1; the third conductive layer 11-3 is disposed on the side of the second conductive layer 11-2 away from the substrate 101 and covers the side surface of the second conductive layer 11-2 and the surface away from the substrate 101, thus encapsulating the side surface of the second conductive layer 11-2 and the surface away from the substrate 101. The materials of the first conductive layer 11-1 and the third conductive layer 11-3 may be metal compounds, such as titanium nitride, and the material of the second conductive layer 11-2 may be a conductive metal, such as aluminum or copper.

[0120] In an exemplary embodiment, the material of the second electrode 13 includes a metal oxide, such as indium zinc oxide; or the material of the second electrode 13 includes an alloy, such as a magnesium silver alloy.

[0121] In an exemplary embodiment, the pixel definition layer 21 has a side surface near the pixel opening 1, and at least a portion of the film layer in the light-emitting functional layer 12 covers the side surface of the pixel definition layer 21, forming a recessed region in the area corresponding to the side surface of the pixel definition layer 21. For example, the first light-emitting layer 31, the second light-emitting layer 32, and the charge-generating layer 30 in the light-emitting functional layer 12 form a recessed region in the area corresponding to the side surface of the pixel definition layer 21.

[0122] Figure 7 is a cross-sectional schematic diagram of the pixel definition layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure. Figure 7 illustrates the structure of the pixel definition layer in the sub-pixel edge region of the display device shown in Figure 6. In an exemplary embodiment, as shown in Figure 7, in a direction perpendicular to the display device, the pixel definition layer 21 includes a first definition layer 21-1, a second definition layer 21-2, and a third definition layer 21-3 stacked sequentially along a direction away from the substrate. At least a portion of the first definition layer 21-1 covers the edge region of the surface of the first electrode 11 away from the substrate, as well as the side surface of the first electrode 11. The first definition layer 21-1 has a first side surface 51 near the pixel opening 1, the second definition layer 21-2 has a second side surface 52 near the pixel opening, and the third definition layer 21-3 has a third side surface 53 near the pixel opening.

[0123] In an exemplary embodiment, at least a portion of the film layer of the light-emitting functional layer 12 covers the first side 51 of the first defining layer 21-1. For example, the first light-emitting layer, the charge-generating layer, and the second light-emitting layer of the light-emitting functional layer 12 cover the first side 51 of the first defining layer 21-1.

[0124] In an exemplary embodiment, the first side surface 51 is connected to the surface of the first electrode 11 away from the substrate. The first side surface 51 extends relative to the second side surface 52 and the third side surface 53, respectively. The first side surface 51 has a first slope angle α1, which is greater than or equal to 30° and less than or equal to 60°. For example, the first slope angle α1 is greater than or equal to 45° and less than or equal to 50°. The first slope angle α1 is the angle formed between the extension line of the first side surface 51 and the plane containing the substrate.

[0125] In an exemplary embodiment, the second side 52 is recessed relative to the first side 51 and the third side 53, respectively, forming a groove recessed along the direction parallel to the base.

[0126] In an exemplary embodiment, the third side 53 extends relative to the second side 52, forming an undercut structure. This undercut structure can isolate a portion of the film layer of the light-emitting functional layer 12 above it. For example, the first light-emitting layer 31 and the charge-generating layer 30 in the light-emitting functional layer 21 are separated at this undercut structure, thereby preventing charge crosstalk between adjacent sub-pixels and avoiding pixel color mixing.

[0127] Figure 8 is a cross-sectional schematic diagram of the first light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure. Figure 8 illustrates the structure of the first light-emitting layer in the sub-pixel edge region of the display device shown in Figure 6. In an exemplary embodiment, as shown in Figure 8, a second recessed region 31-3 is formed on the surface of the first light-emitting layer 31 away from the substrate in the region corresponding to the first side of the pixel definition layer. A second flat surface 31-1 is connected to one end of the second recessed region 31-3 near the middle region of the sub-pixel. The second flat surface 31-1 is parallel to the substrate. A second protrusion 31-2 is connected to one end of the second recessed region 31-3 away from the middle region of the sub-pixel. The bottom of the second recessed region 31-3 is arc-shaped. The slope angle b1 of the side of the second recessed region 31-3 away from the second flat surface 31-1 is greater than or equal to 30° and less than or equal to 60°. For example, the slope angle b1 of the side of the second recessed region 31-3 away from the second flat surface 31-1 is greater than or equal to 45° and less than or equal to 55°.

[0128] In an exemplary embodiment, the vertical distance H1 from the lowest point of the second recessed region 31-3 to the second flat surface 31-1 is greater than or equal to 30 angstroms and less than or equal to 80 angstroms. For example, the vertical distance H1 from the lowest point of the second recessed region 31-3 to the highest point of the second flat surface 31-1 is greater than or equal to 50 angstroms and less than or equal to 70 angstroms.

[0129] In an exemplary embodiment, the minimum distance L1 from the lowest point of the second recessed region 31-3 to the edge of the second flat surface 31-1 is greater than or equal to 30 angstroms and less than or equal to 100 angstroms. For example, the minimum distance L1 from the lowest point of the second recessed region 31-3 to the edge of the second flat surface 31-1 is greater than or equal to 50 angstroms and less than or equal to 80 angstroms.

[0130] The display device of this disclosure controls the first slope angle a1 of the first side of the pixel definition layer to be greater than or equal to 30° and less than or equal to 60°, thereby reducing the distortion of the morphology of the second recessed region 31-3 of the first light-emitting layer, avoiding low grayscale light leakage of the display device, and improving the consistency of high and low grayscale of the display device.

[0131] Figure 9 is a cross-sectional schematic diagram of the charge generation layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure. Figure 9 illustrates the structure of the charge generation layer in the sub-pixel edge region of the display device shown in Figure 6. In an exemplary embodiment, as shown in Figure 9, the surface of the charge generation layer 30 away from the substrate forms a first recessed region 30-3 in the region corresponding to the first side of the pixel definition layer. One end of the first recessed region 30-3 near the middle region of the sub-pixel is connected to a first flat surface 30-1, which is parallel to the substrate. One end of the first recessed region 30-3 away from the middle region of the sub-pixel is connected to a first protrusion 30-2. The bottom of the first recessed region 30-3 is arc-shaped, and the slope angle b2 of the side of the first recessed region 30-3 away from the first flat surface 30-1 is greater than or equal to 30° and less than or equal to 60°. For example, the slope angle b2 of the side of the first recessed region 30-3 away from the first flat surface 30-1 is greater than or equal to 45° and less than or equal to 55°.

[0132] In an exemplary embodiment, the vertical distance H2 from the lowest point of the first recessed region 30-1 to the first flat surface 30-1 is greater than or equal to 4 angstroms and less than or equal to 9 angstroms.

[0133] The display device in this embodiment controls the first slope angle α1 of the first side of the pixel definition layer corresponding to the sub-pixel to be greater than or equal to 30° and less than or equal to 60°, thereby preventing the charge generation layer from forming punctures on the side of the pixel definition layer, reducing the accumulation of charge carriers in the charge generation layer, and improving the service life of the display device.

[0134] Figure 10 is a cross-sectional schematic diagram of the second light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure. Figure 10 illustrates the structure of the second light-emitting layer in the sub-pixel edge region of the display device shown in Figure 6. In an exemplary embodiment, as shown in Figure 10, the surface of the second light-emitting layer 32 away from the substrate forms a third recessed region 32-3 in the region corresponding to the first side of the pixel definition layer. The third recessed region 32-3, near the middle region of the sub-pixel, is connected to a third flat surface 32-1, which is parallel to the substrate. The third recessed region 32-3, away from the middle region of the sub-pixel, is connected to a third protrusion 32-2. The slope angle b3 of the side of the third recessed region 32-3 away from the third flat surface 32-1 is greater than 60° and less than or equal to 90°. For example, the slope angle b3 of the side of the third recessed region 32-3 away from the third flat surface 32-1 is greater than or equal to 75° and less than or equal to 85°.

[0135] In an exemplary embodiment, the vertical distance H3 from the lowest point of the third recessed region 32-3 to the third flat surface 32-1 is greater than 70 angstroms and less than or equal to 80 angstroms.

[0136] In an exemplary embodiment, the minimum distance L2 from the lowest point of the third recessed region 32-3 to the edge of the third flat surface 32-1 is less than 100 angstroms. For example, the minimum distance L2 from the lowest point of the third recessed region 32-3 to the edge of the third flat surface 32-1 can be greater than or equal to 30 angstroms and less than or equal to 60 angstroms.

[0137] When the sub-pixel shown in FIG. 6 of this embodiment is a first sub-pixel or a second sub-pixel, the color of the light emitted by the first light-emitting unit 12-1 includes at least the color of the light emitted by the first sub-pixel and the color of the light emitted by the second sub-pixel, and the color of the light emitted by the second light-emitting unit 12-2 includes at least the color of the light emitted by the third sub-pixel. For example, the first sub-pixel P1 can be a red sub-pixel emitting red (R) light, the second sub-pixel P2 can be a green sub-pixel emitting green (G) light, and the third sub-pixel P3 can be a blue sub-pixel emitting blue (B) light; the first light-emitting unit 12-1 can emit yellow light, and the first light-emitting layer 31 of the first light-emitting unit 12-1 can include a stacked green light-emitting layer and a red light-emitting layer, which are stacked on top of each other to achieve the emission of yellow light by the first light-emitting unit 12-1. The second light-emitting unit 12-2 can emit blue light, and the second light-emitting layer 32 of the second light-emitting unit 12-2 can be a blue light-emitting layer to achieve the emission of blue light by the second light-emitting unit 12-2.

[0138] The display device of this disclosure controls the first slope angle a1 of the first side of the pixel definition layer corresponding to the first sub-pixel or the second sub-pixel to be greater than or equal to 30° and less than or equal to 60°, thereby reducing the distortion of the morphology of the second recessed region 31-3 of the first light-emitting layer that emits yellow light, avoiding low grayscale light leakage of the first sub-pixel or the second sub-pixel, and improving the consistency of high and low grayscale of the display device.

[0139] When the sub-pixel shown in FIG. 6 of this embodiment is the third sub-pixel, the color of the light emitted by the first light-emitting unit 12-1 includes at least the color of the light emitted by the third sub-pixel, and the color of the light emitted by the second light-emitting unit 12-2 includes at least the colors of the light emitted by the first sub-pixel and the second sub-pixel. For example, the first sub-pixel P1 can be a red sub-pixel emitting red (R) light, the second sub-pixel P2 can be a green sub-pixel emitting green (G) light, and the third sub-pixel P3 can be a blue sub-pixel emitting blue (B) light; the first light-emitting unit 12-1 can emit blue light, and the first light-emitting layer 31 of the first light-emitting unit 12-1 can be a blue light-emitting layer, thereby realizing the first light-emitting unit 12-1 emitting blue light. The second light-emitting unit 12-2 can emit yellow light, and the second light-emitting layer 32 of the second light-emitting unit 12-2 can include a stacked green light-emitting layer and a red light-emitting layer, which are stacked on top of each other, thereby realizing the second light-emitting unit 12-2 emitting yellow light.

[0140] The display device of this disclosure controls the first slope angle a1 of the side of the pixel definition layer corresponding to the third sub-pixel to be greater than or equal to 30° and less than or equal to 60°, thereby reducing the distortion of the morphology of the second recessed region 31-3 of the first light-emitting layer that emits blue light, avoiding low grayscale light leakage of the third sub-pixel, and improving the consistency of high and low grayscale of the display device.

[0141] Figure 11 is a cross-sectional view of the edge region of another sub-pixel in the pixel unit of the display device according to an embodiment of the present disclosure. In an exemplary embodiment, as shown in Figure 11, the structure of the edge region of another sub-pixel in the pixel unit of the display device according to an embodiment of the present disclosure is generally the same as the structure of the edge region of the sub-pixel shown in Figure 6. The difference is that the slope angle of the first side of the pixel definition layer 21 corresponding to the sub-pixel is greater than 60° and less than or equal to 90°, and the morphology of the recessed region formed by the film layer in the light-emitting functional layer in the region corresponding to the first side of the pixel definition layer 21 is different from the morphology of the recessed region of the film layer in the light-emitting functional layer shown in Figure 6.

[0142] Figure 12 is a second schematic cross-sectional view of the pixel definition layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure. Figure 12 illustrates the structure of the pixel definition layer in the sub-pixel edge region of the display device shown in Figure 11. In an exemplary embodiment, as shown in Figure 12, in a direction perpendicular to the display device, the pixel definition layer 21 includes a first definition layer 21-1, a second definition layer 21-2, and a third definition layer 21-3 stacked sequentially along a direction away from the substrate. At least a portion of the first definition layer 21-1 covers the edge region of the surface of the first electrode 11 away from the substrate, as well as the side surface of the first electrode 11. The first definition layer 21-1 has a first side surface 51' near the pixel opening, the second definition layer 21-2 has a second side surface 52' near the pixel opening, and the third definition layer 21-3 has a third side surface 53' near the pixel opening.

[0143] In an exemplary embodiment, at least a portion of the light-emitting functional layer 12 covers the first side 51' of the first defining layer 21-1. For example, the first light-emitting layer, the charge-generating layer, and the second light-emitting layer of the light-emitting functional layer 12 cover the first side 51' of the first defining layer 21-1.

[0144] In an exemplary embodiment, the first side surface 51' is connected to the surface of the first electrode 11 away from the substrate at one end near the substrate. The first side surface 51' extends relative to the second side surface 52' and the third side surface 53', respectively. The first side surface 51' of the pixel opening 1 corresponding to the third sub-pixel has a second slope angle α2, which is greater than 60° and less than or equal to 90°. For example, the second slope angle α2 is greater than or equal to 75° and less than or equal to 85°. The second slope angle α2 is the angle formed between the extension line of the first side surface 51' and the plane containing the substrate.

[0145] In an exemplary embodiment, the second side 52' is recessed relative to the first side 51' and the third side 53', respectively, forming a groove recessed along a direction parallel to the base.

[0146] In an exemplary embodiment, the third side 53' extends relative to the second side 52', forming an undercut structure. This undercut structure can isolate a portion of the film layer of the light-emitting functional layer 12 above it. For example, the first light-emitting layer 31 and the charge-generating layer 30 in the light-emitting functional layer 21 are separated at this undercut structure to prevent charge crosstalk between adjacent sub-pixels and avoid pixel color mixing.

[0147] Figure 13 is a second cross-sectional schematic diagram of the first light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure. Figure 13 illustrates the structure of the first light-emitting layer in the sub-pixel edge region of the display device shown in Figure 11. In an exemplary embodiment, as shown in Figure 13, a second recessed region 31-3 is formed on the surface of the first light-emitting layer 31 away from the substrate in the region corresponding to the first side of the pixel definition layer. A second flat surface 31-1 is connected to one end of the second recessed region 31-3 near the middle region of the sub-pixel. The second flat surface 31-1 is parallel to the substrate. A second protrusion 31-2 is connected to one end of the second recessed region 31-3 away from the middle region of the sub-pixel. The bottom of the second recessed region 31-3 is arc-shaped, and the slope angle b1' of the side of the second recessed region 31-3 away from the second flat surface 31-1 is greater than 60° and less than or equal to 90°. For example, the slope angle b1' of the side of the second recessed region 31-3 away from the second flat surface 31-1 is greater than or equal to 75° and less than or equal to 85°.

[0148] In an exemplary embodiment, the vertical distance H1' from the lowest point of the second recessed region 31-3 to the second flat surface 31-1 is greater than 80 angstroms and less than or equal to 120 angstroms. For example, the vertical distance H1' of the second recessed region 31-3 is greater than or equal to 90 angstroms and less than or equal to 110 angstroms.

[0149] In an exemplary embodiment, the minimum distance L1' from the lowest point of the second recessed region 31-3 to the edge of the second flat surface 31-1 is greater than 100 angstroms and less than or equal to 300 angstroms. For example, the minimum distance L1' from the lowest point of the second recessed region 31-3 to the edge of the second flat surface 31-1 is greater than or equal to 150 angstroms and less than or equal to 250 angstroms.

[0150] Figure 14 is a second schematic cross-sectional view of the charge generation layer in the sub-pixel edge region of the display device according to an embodiment of this disclosure. Figure 14 illustrates the structure of the charge generation layer in the sub-pixel edge region of the display device shown in Figure 11. In an exemplary embodiment, as shown in Figure 14, the surface of the charge generation layer 30 away from the substrate forms a first recessed region 30-3 in the region corresponding to the first side of the pixel definition layer. One end of the first recessed region 30-3 near the middle region of the sub-pixel is connected to a first flat surface 30-1, which is parallel to the substrate. One end of the first recessed region 30-3 away from the middle region of the sub-pixel is connected to a first protrusion 30-2. The bottom of the first recessed region 30-3 is angular, and the slope angle b2' of the side of the first recessed region 30-3 away from the first flat surface 30-1 is greater than 60° and less than or equal to 90°. For example, the slope angle b2' of the side of the first recessed region 30-3 away from the first flat surface 30-1 is greater than or equal to 75° and less than or equal to 85°.

[0151] In an exemplary embodiment, the vertical distance H2' between the lowest point of the first recessed region 30-1 and the first flat surface 30-1 is greater than 9 angstroms and less than or equal to 14 angstroms.

[0152] Figure 15 is a cross-sectional schematic diagram of the second light-emitting layer in the sub-pixel edge region of the display device according to an embodiment of the present disclosure. Figure 15 illustrates the structure of the second light-emitting layer in the sub-pixel edge region of the display device shown in Figure 11. In an exemplary embodiment, as shown in Figure 15, the surface of the second light-emitting layer 32 away from the substrate forms a third recessed region 32-3 in the region corresponding to the first side of the pixel definition layer. The third recessed region 32-3, near the middle region of the sub-pixel, is connected to a third flat surface 32-1, which is parallel to the substrate. The third recessed region 32-3, away from the middle region of the sub-pixel, is connected to a third protrusion 32-2. The slope angle b3' of the side of the third recessed region 32-3 away from the third flat surface 32-1 is greater than or equal to 30° and less than or equal to 60°. For example, the slope angle b3' of the side of the third recessed region 32-3 away from the third flat surface 32-1 is greater than or equal to 45° and less than or equal to 55°.

[0153] In an exemplary embodiment, the vertical distance H3' from the lowest point of the third recessed region 32-3 to the third flat surface 32-1 is greater than or equal to 60 angstroms and less than or equal to 70 angstroms.

[0154] In an exemplary embodiment, the minimum distance L2' from the lowest point of the third recessed region 32-3 to the edge of the third flat surface 32-1 is greater than or equal to 100 angstroms and less than or equal to 300 angstroms. For example, the minimum distance L2' from the lowest point of the third recessed region 32-3 to the edge of the third flat surface 32-1 is greater than or equal to 150 angstroms and less than or equal to 200 angstroms.

[0155] The display device of this disclosure controls the first slope angle a2 of the side of the pixel definition layer corresponding to the sub-pixel to be greater than 60° and less than or equal to 90°, thereby reducing the distortion of the morphology of the third recessed region 32-3 of the second light-emitting layer, avoiding low grayscale light leakage, and improving the consistency of high and low grayscale of the display device.

[0156] When the sub-pixel shown in FIG11 of this embodiment is a first sub-pixel or a second sub-pixel, the color of the light emitted by the first light-emitting unit 12-1 includes at least the color of the light emitted by the third sub-pixel, and the color of the light emitted by the second light-emitting unit 12-2 includes at least the colors of the light emitted by the first sub-pixel and the second sub-pixel. For example, the first sub-pixel P1 may be a red sub-pixel emitting red (R) light, the second sub-pixel P2 may be a green sub-pixel emitting green (G) light, and the third sub-pixel P3 may be a blue sub-pixel emitting blue (B) light; the first light-emitting unit 12-1 may emit blue light, and the first light-emitting layer 31 of the first light-emitting unit 12-1 may be a blue light-emitting layer, thereby realizing the emission of blue light by the first light-emitting unit 12-1. The second light-emitting unit 12-2 may emit yellow light, and the second light-emitting layer 32 of the second light-emitting unit 12-2 may include a stacked green light-emitting layer and a red light-emitting layer, which are stacked on top of each other, thereby realizing the emission of yellow light by the second light-emitting unit 12-2.

[0157] The display device of this disclosure controls the second slope angle a2 of the side of the pixel definition layer corresponding to the first sub-pixel or the second sub-pixel to be greater than 60° and less than or equal to 90°, thereby reducing the distortion of the morphology of the third recessed area of ​​the second light-emitting layer that emits yellow light, avoiding low grayscale light leakage of the first sub-pixel or the second sub-pixel, and improving the consistency of high and low grayscale of the display device.

[0158] When the sub-pixel shown in FIG11 of this embodiment is the third sub-pixel, the color of the light emitted by the first light-emitting unit 12-1 includes at least the color of the light emitted by the first sub-pixel and the color of the light emitted by the second sub-pixel, and the color of the light emitted by the second light-emitting unit 12-2 includes at least the color of the light emitted by the third sub-pixel. For example, the first sub-pixel P1 can be a red sub-pixel emitting red (R) light, the second sub-pixel P2 can be a green sub-pixel emitting green (G) light, and the third sub-pixel P3 can be a blue sub-pixel emitting blue (B) light; the first light-emitting unit 12-1 can emit yellow light, and the first light-emitting layer 31 of the first light-emitting unit 12-1 can include a stacked green light-emitting layer and a red light-emitting layer, which are stacked on top of each other to achieve the emission of yellow light by the first light-emitting unit 12-1; the second light-emitting unit 12-2 can emit blue light, and the second light-emitting layer 32 of the second light-emitting unit 12-2 can be a blue light-emitting layer to achieve the emission of blue light by the second light-emitting unit 12-2.

[0159] The display device of this disclosure controls the second slope angle a2 of the side of the pixel definition layer corresponding to the third sub-pixel to be greater than 60° and less than or equal to 90°, thereby reducing the distortion of the morphology of the third recessed area of ​​the second light-emitting layer emitting blue light, avoiding low grayscale light leakage of the third sub-pixel, and improving the consistency of high and low grayscale of the display device.

[0160] Figure 16 is a graph showing the slope angle of the side of the pixel definition layer and the thickness of the first light-emitting layer in the display device of this embodiment. As shown in Figure 16, a simulation experiment was conducted on the sub-pixels of the display device of this embodiment. The slope angle of the side of the pixel definition layer is greater than or equal to 30° and less than or equal to 60°, and the thickness of the first light-emitting layer in the second recessed region is uniform. The slope angle of the side of the pixel definition layer is greater than 60° and less than or equal to 90°, and the thickness of the first light-emitting layer in the second recessed region is uniform. The thickness of the first light-emitting layer is the vertical distance between the surface of the first light-emitting layer away from the substrate and the surface of the first light-emitting layer close to the substrate.

[0161] Figure 17 is a graph showing the slope angle of the side of the pixel definition layer and the depth of the first recessed region of the charge generation layer in the display device of this embodiment. As shown in Figure 17, a simulation experiment was conducted on the sub-pixels of the display device of this embodiment. The depth of the first recessed region of the charge generation layer increases with the increase of the slope angle of the side of the pixel definition layer. When the slope angle of the side of the pixel definition layer is greater than or equal to 30° and less than or equal to 60°, the depth of the first recessed region of the charge generation layer is greater than or equal to 4 angstroms and less than or equal to 9 angstroms. When the slope angle of the side of the pixel definition layer is greater than 60° and less than or equal to 90°, the depth of the first recessed region of the charge generation layer is greater than 9 angstroms and less than or equal to 14 angstroms. The depth of the first recessed region is the vertical distance from the lowest point of the first recessed region to the first flat surface.

[0162] Figure 18 is a graph showing the slope angle of the side of the pixel definition layer and the width of the third recessed region of the second light-emitting layer in the display device of this embodiment. As shown in Figure 18, a simulation experiment was conducted on the sub-pixels of the display device of this embodiment. The width of the third recessed region of the second light-emitting layer decreases as the slope angle of the side of the pixel definition layer increases. When the slope angle of the side of the pixel definition layer is greater than or equal to 30° and less than or equal to 60°, the width of the third recessed region of the second light-emitting layer is greater than or equal to 100 angstroms and less than or equal to 300 angstroms; when the slope angle of the side of the pixel definition layer is greater than 60° and less than or equal to 90°, the width of the third recessed region of the second light-emitting layer is less than 100 angstroms. The width of the third recessed region is the minimum distance from the lowest point of the third recessed region to the edge of the third flat surface.

[0163] Figure 19 is a schematic cross-sectional view of the first electrode in the display device according to an embodiment of the present disclosure. In an exemplary embodiment, as shown in Figure 19, the first electrode 11 further includes an electrode insulating layer 11-4 disposed between the second conductive layer 11-2 and the third conductive layer 11-3. The electrode insulating layer 11-4 has a through hole, and the third conductive layer 11-3 is connected to the second conductive layer 11-2 through the through hole.

[0164] In an exemplary embodiment, the pixel unit includes a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. The vertical distance h3 from the first electrode 11 of the third sub-pixel P3 to the surface of the substrate 101 on the side away from the substrate is greater than the vertical distance h1 from the first electrode 11 of the first sub-pixel P1 to the surface of the substrate 101 on the side away from the substrate 101. The vertical distance h1 from the first electrode 11 of the first sub-pixel P1 to the surface of the substrate 101 on the side away from the substrate 101 is greater than the vertical distance h2 from the first electrode 11 of the second sub-pixel P2 to the surface of the substrate on the side away from the substrate.

[0165] In an exemplary embodiment, the light-emitting functional layers in the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the color of the light emitted by the first light-emitting unit includes the first color and the second color, for example, yellow light; the color of the light emitted by the second light-emitting unit includes the third color, for example, blue light; the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel, and the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel.

[0166] In an exemplary embodiment, the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than 60° and less than or equal to 90°, the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than or equal to 30° and less than or equal to 60°, and the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than or equal to 30° and less than or equal to 60°.

[0167] The display device of this disclosure emits yellow light through the first light-emitting unit and blue light through the second light-emitting unit, which makes the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel P3 larger, and the vertical distance from the surface of the first electrode 11 of the third sub-pixel P3 away from the substrate to the surface of the substrate 101 larger, thereby reducing the distortion of the light-emitting layer morphology of the second light-emitting unit emitting blue light in the third sub-pixel P3, avoiding low grayscale light leakage of the third sub-pixel P3, and improving the consistency of high and low grayscale of the display device.

[0168] The display device of this disclosure emits yellow light through a first light-emitting unit and blue light through a second light-emitting unit. This results in a smaller slope angle on the side of the pixel definition layer corresponding to the first sub-pixel P1 and the second sub-pixel P2, and a smaller vertical distance from the surface of the first electrode 11 of the first sub-pixel P1 and the second sub-pixel P2 away from the substrate to the surface of the substrate 101. This reduces the distortion of the morphology of the light-emitting layer of the first light-emitting unit emitting yellow light in the first sub-pixel P1 and the second sub-pixel P2, avoids low grayscale light leakage in the first sub-pixel P1 and the second sub-pixel P2, and improves the consistency of high and low grayscale in the display device.

[0169] In an exemplary embodiment, the light-emitting functional layers in the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the color of the light emitted by the first light-emitting unit includes a third color, such as blue light; the color of the light emitted by the second light-emitting unit includes the first color and the second color, such as yellow light; the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel; and the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel.

[0170] In an exemplary embodiment, the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than or equal to 30° and less than or equal to 60°, the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than 60° and less than or equal to 90°, and the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than 60° and less than or equal to 90°.

[0171] The display device of this disclosure emits blue light through the first light-emitting unit and yellow light through the second light-emitting unit, so that the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel P3 is smaller, and the vertical distance from the surface of the first electrode 11 of the third sub-pixel P3 away from the substrate to the surface of the substrate 101 is larger. This reduces the distortion of the morphology of the light-emitting layer of the first light-emitting unit emitting blue light in the third sub-pixel P3, avoids low grayscale light leakage of the third sub-pixel P3, and improves the consistency of high and low grayscale in the display device.

[0172] The display device of this disclosure emits blue light through a first light-emitting unit and yellow light through a second light-emitting unit. This results in a larger slope angle on the side of the pixel definition layer corresponding to the first sub-pixel P1 and the second sub-pixel P2, and a smaller vertical distance from the surface of the first electrode 11 of the first sub-pixel P1 and the second sub-pixel P2 away from the substrate to the surface of the substrate 101. This reduces the distortion of the light-emitting layer morphology of the second light-emitting unit emitting yellow light in the first sub-pixel P1 and the second sub-pixel P2, avoids low grayscale light leakage in the first sub-pixel P1 and the second sub-pixel P2, and improves the consistency of high and low grayscale in the display device.

[0173] In an exemplary embodiment, the thickness of the electrode insulating layer 11-4 of the first electrode 11 of the third sub-pixel P3 is greater than the thickness of the electrode insulating layer 11-4 of the first electrode 11 of the first sub-pixel P1, and the thickness of the electrode insulating layer 11-4 of the first electrode 11 of the first sub-pixel P1 is greater than the thickness of the electrode insulating layer 11-4 of the first electrode 11 of the second sub-pixel P2.

[0174] Figure 20 is a cross-sectional structural diagram of the pixel definition layer in the display device according to an embodiment of the present disclosure. In an exemplary embodiment, as shown in Figure 20, a partition groove 22 is provided in the pixel definition layer 21. The partition groove 22 is located in the non-sub-pixel area. At least a portion of the film layer of the light-emitting functional layer covers the bottom wall and side wall of the partition groove 22 to form a recessed area, thereby avoiding crosstalk between adjacent sub-pixels.

[0175] The display device in this embodiment can be any product or component with display function, such as a mobile phone, wearable device, AR or VR display device, vehicle display device, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. This embodiment of the invention is not limited thereto.

[0176] This disclosure also provides a method for manufacturing a display device, the display device comprising at least one pixel unit, the pixel unit comprising at least two sub-pixels, the method for manufacturing the display device comprising:

[0177] A first electrode is formed on the substrate;

[0178] A pixel definition layer is formed on the side of the first electrode away from the substrate. The pixel definition layer is provided with a pixel opening that defines the sub-pixel. The pixel opening exposes at least a portion of the corresponding first electrode. The pixel definition layer is provided with a side surface that is close to the pixel opening and connected to the first electrode.

[0179] A light-emitting functional layer is formed on the side of the pixel definition layer away from the substrate. The light-emitting functional layer covers the pixel opening and is connected to the exposed first electrode. At least a portion of the light-emitting functional layer covers the side surface of the pixel definition layer.

[0180] A second electrode is formed on the side of the light-emitting functional layer away from the substrate;

[0181] In this pixel unit, the slope angles of the side surfaces of the pixel definition layer corresponding to at least two sub-pixels are different.

[0182] While the embodiments disclosed herein are as described above, the content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit the invention. Any person skilled in the art may make any modifications and changes to the form and details of the implementation without departing from the spirit and scope of this disclosure; however, the patent protection scope of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A display device comprising: At least one pixel unit disposed on a substrate, the pixel unit comprising at least two sub-pixels, the at least two sub-pixels comprising a first electrode, a light-emitting functional layer and a second electrode sequentially stacked along a direction away from the substrate; The display device includes a pixel definition layer disposed on the side of the first electrode away from the substrate. The pixel definition layer has a pixel opening that defines the sub-pixel. The pixel opening exposes at least a portion of the corresponding first electrode. The light-emitting functional layer covers the pixel opening and is connected to the exposed first electrode. The pixel definition layer has a side surface near the pixel opening and connected to the first electrode. The light-emitting functional layer at least partially covers the side surface of the pixel definition layer. The slope angles of the side surfaces of the pixel definition layer corresponding to the at least two sub-pixels are different from each other.

2. The display device according to claim 1, wherein The light-emitting functional layer forms a recessed area in the area corresponding to the side of the pixel definition layer, and the slope angles of the recessed areas corresponding to the side of the pixel definition layer are different.

3. The display device according to claim 1, wherein The slope angle of the side of the pixel definition layer corresponding to at least one sub-pixel in the pixel unit is greater than or equal to 30° and less than or equal to 60°, and the slope angle of the side of the pixel definition layer corresponding to at least one sub-pixel in the pixel unit is greater than 60° and less than or equal to 90°.

4. The display device according to claim 1, wherein The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the pixel unit includes a first sub-pixel group and a second sub-pixel group, the first sub-pixel group includes at least one sub-pixel, the color of the light emitted by the first light-emitting unit includes the color of the light emitted by the sub-pixel of the first sub-pixel group, the side of the pixel definition layer corresponding to the sub-pixel of the first sub-pixel group has a first slope angle, the second sub-pixel group includes at least one sub-pixel, the color of the light emitted by the second light-emitting unit includes the color of the light emitted by the sub-pixel of the second sub-pixel group, the side of the pixel definition layer corresponding to the sub-pixel of the second sub-pixel group has a second slope angle, the second slope angle being greater than the first slope angle.

5. The display device of claim 4, wherein, The difference between the second slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°.

6. The display device according to claim 4, wherein The first slope angle is greater than or equal to 30° and less than or equal to 60°, and the second slope angle is greater than 60° and less than or equal to 90°.

7. The display device according to claim 1, wherein Each light-emitting functional layer includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit stacked sequentially along a direction away from the substrate, and a first charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit, and a second charge-generating layer disposed between the second light-emitting unit and the third light-emitting unit; each pixel unit includes a first sub-pixel group, a second sub-pixel group, and a third sub-pixel group, wherein the first sub-pixel group includes at least one sub-pixel, the color of the light emitted by the first light-emitting unit includes the color of the light emitted by the sub-pixel of the first sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the first sub-pixel group has a first slope angle; the second sub-pixel group includes at least one sub-pixel, the color of the light emitted by the second light-emitting unit includes the color of the light emitted by the sub-pixel of the second sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the second sub-pixel group has a second slope angle; the third sub-pixel group includes at least one sub-pixel, the color of the light emitted by the third light-emitting unit includes the color of the light emitted by the sub-pixel of the third sub-pixel group, and the side of the pixel definition layer corresponding to the sub-pixel of the third sub-pixel group has a third slope angle, the third slope angle being greater than the first slope angle, and the second slope angle being greater than the first slope angle.

8. The display device of claim 7, wherein, The difference between the third slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°, and the difference between the second slope angle and the first slope angle is greater than or equal to 10° and less than or equal to 60°.

9. The display device according to claim 7, wherein The first slope angle is greater than or equal to 30° and less than or equal to 60°, the second slope angle is greater than 60° and less than or equal to 90°, and the third slope angle is greater than 60° and less than or equal to 90°.

10. The display device according to claim 1, wherein The pixel unit includes a first sub-pixel emitting a first color light, a second sub-pixel emitting a second color light, and a third sub-pixel emitting a third color light. The light-emitting functional layers in the first, second, and third sub-pixels each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first and second light-emitting units. The color of the light emitted by the first light-emitting unit includes both the first and second colors, and the color of the light emitted by the second light-emitting unit includes the third color. The slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than or equal to 30° and less than or equal to 60°, the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than or equal to 30° and less than or equal to 60°, and the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than 60° and less than or equal to 90°.

11. The display device according to claim 1, wherein The pixel unit includes a first sub-pixel emitting a first color light, a second sub-pixel emitting a second color light, and a third sub-pixel emitting a third color light. The light-emitting functional layers in the first, second, and third sub-pixels each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first and second light-emitting units. The color of the light emitted by the first light-emitting unit includes the third color, and the color of the light emitted by the second light-emitting unit includes both the first and second colors. The slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than 60° and less than or equal to 90°, the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than 60° and less than or equal to 90°, and the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than or equal to 30° and less than or equal to 60°.

12. The display device according to any one of claims 1 to 6, wherein The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the surface of the charge-generating layer away from the substrate forms a first recessed region in the corresponding area of ​​the side of the pixel definition layer, the end of the first recessed region near the middle region of the sub-pixel is connected to a first flat surface, the first flat surface is parallel to the substrate, the end of the first recessed region away from the middle region of the sub-pixel is connected to a first protrusion, and the slope angle of the side of the first recessed region away from the first flat surface is greater than or equal to 30° and less than or equal to 60°.

13. The display device of claim 12, wherein, The vertical distance from the lowest point of the first recessed region to the first flat surface is greater than or equal to 4 angstroms and less than or equal to 9 angstroms.

14. The display device according to any one of claims 1 to 6, wherein The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the surface of the charge-generating layer away from the substrate forms a first recessed region in the corresponding area of ​​the side of the pixel definition layer, the end of the first recessed region near the middle region of the sub-pixel is connected to a first flat surface, the first flat surface is parallel to the substrate, the end of the first recessed region away from the middle region of the sub-pixel is connected to a first protrusion, and the slope angle of the side of the first recessed region away from the first flat surface is greater than 60° and less than or equal to 90°.

15. The display device of claim 14, wherein, The vertical distance from the lowest point of the first recessed region to the first flat surface is greater than 9 angstroms and less than or equal to 14 angstroms.

16. The display device according to any one of claims 1 to 6, wherein The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; The first light-emitting unit includes a first light-emitting layer. The surface of the first light-emitting layer away from the substrate forms a second recessed region in the corresponding area of ​​the side of the pixel definition layer. The end of the second recessed region near the middle area of ​​the sub-pixel is connected to a second flat surface. The second flat surface is parallel to the substrate. The end of the second recessed region away from the middle area of ​​the sub-pixel is connected to a second protrusion. The slope angle of the side of the second recessed region away from the second flat surface is greater than or equal to 30° and less than or equal to 60°.

17. The display device of claim 16, wherein, The vertical distance from the lowest point of the second recessed region to the second flat surface is greater than or equal to 30 angstroms and less than or equal to 80 angstroms.

18. The display device of claim 16, wherein, The minimum distance from the lowest point of the second recessed region to the edge of the second flat surface is greater than or equal to 30 angstroms and less than or equal to 100 angstroms.

19. The display device according to any one of claims 1 to 6, wherein The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; The first light-emitting unit includes a first light-emitting layer. The surface of the first light-emitting layer away from the substrate forms a second recessed region in the corresponding area of ​​the side of the pixel definition layer. The end of the second recessed region near the middle area of ​​the sub-pixel is connected to a second flat surface. The second flat surface is parallel to the substrate. The end of the second recessed region away from the middle area of ​​the sub-pixel is connected to a second protrusion. The slope angle of the side of the second recessed region away from the second flat surface is greater than 60° and less than or equal to 90°.

20. The display device of claim 19, wherein, The vertical distance from the lowest point of the second recessed region to the second flat surface is greater than 80 angstroms and less than or equal to 120 angstroms.

21. The display device of claim 19, wherein, The vertical distance from the lowest point of the second recessed region to the second flat surface is greater than 100 angstroms and less than or equal to 300 angstroms.

22. The display device according to any one of claims 1 to 6, wherein The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; The second light-emitting unit includes a second light-emitting layer. The surface of the second light-emitting layer away from the substrate forms a third recessed region in the corresponding area of ​​the side of the pixel definition layer. The end of the third recessed region near the middle area of ​​the sub-pixel is connected to a third flat surface. The third flat surface is parallel to the substrate. The end of the third recessed region away from the middle area of ​​the sub-pixel is connected to a third protrusion. The slope angle of the side of the third recessed region away from the third flat surface is greater than or equal to 30° and less than or equal to 60°.

23. The display device of claim 22, wherein, The vertical distance from the lowest point of the third concave region to the third flat surface is greater than or equal to 60 angstroms and less than or equal to 70 angstroms.

24. The display device of claim 22, wherein, The minimum distance from the lowest point of the third concave region to the edge of the third flat surface is greater than or equal to 100 angstroms and less than or equal to 300 angstroms.

25. The display device according to any one of claims 1 to 6, wherein The light-emitting functional layer includes a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; The second light-emitting unit includes a second light-emitting layer. The surface of the second light-emitting layer away from the substrate forms a third recessed region in the corresponding area of ​​the side of the pixel definition layer. The end of the third recessed region near the middle area of ​​the sub-pixel is connected to a third flat surface. The third flat surface is parallel to the substrate. The end of the third recessed region away from the middle area of ​​the sub-pixel is connected to a third protrusion. The slope angle of the side of the third recessed region away from the third flat surface is greater than 60° and less than or equal to 90°.

26. The display device of claim 25, wherein, The vertical distance from the lowest point of the third concave region to the third flat surface is greater than 70 angstroms and less than or equal to 80 angstroms.

27. The display device of claim 25, wherein, The minimum distance from the lowest point of the third concave region to the edge of the third flat surface is less than 100 angstroms.

28. The display device according to any one of claims 1 to 11, wherein The pixel definition layer includes a first definition layer, a second definition layer, and a third definition layer stacked sequentially along a direction away from the substrate. The first definition layer has a first side surface near the pixel opening, the second definition layer has a second side surface near the pixel opening, and the third definition layer has a third side surface near the pixel opening. The first side surface is connected to the first electrode and extends relative to the second and third side surfaces, respectively. The side surface of the pixel definition layer includes the first side surface, the second side surface, and the third side surface. The angle formed between the first side surface and the plane where the substrate is located forms the slope angle of the side surface of the pixel definition layer.

29. The display device of claim 28, wherein, The third side extends beyond the second side, and the third side and the second side form an undercut structure, with at least a portion of the film layer in the light-emitting functional layer being separated at the undercut structure.

30. The display device of claim 1, wherein, The first electrode includes a first conductive layer, a second conductive layer, and a third conductive layer stacked sequentially along a direction perpendicular to the substrate.

31. A display device according to claim 30, wherein, The first electrode further includes an electrode insulating layer disposed between the second conductive layer and the third conductive layer, wherein a via is provided in the electrode insulating layer, and the third conductive layer is connected to the second conductive layer through the via.

32. The display device of claim 31, wherein, The pixel unit includes a first sub-pixel emitting a first color light, a second sub-pixel emitting a second color light, and a third sub-pixel emitting a third color light. The vertical distance from the first electrode of the third sub-pixel away from the substrate to the substrate surface is greater than the vertical distance from the first electrode of the first sub-pixel away from the substrate to the substrate surface. The vertical distance from the first electrode of the first sub-pixel away from the substrate to the substrate surface is greater than the vertical distance from the first electrode of the second sub-pixel away from the substrate to the substrate surface.

33. The display device of claim 32, wherein, The light-emitting functional layers in the first sub-pixel, the second sub-pixel, and the third sub-pixel each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the color of the light emitted by the first light-emitting unit includes the first color and the second color, the color of the light emitted by the second light-emitting unit includes the third color, the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel, and the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel; Alternatively, the light-emitting functional layers in the first sub-pixel, the second sub-pixel, and the third sub-pixel each include a first light-emitting unit and a second light-emitting unit stacked sequentially along a direction away from the substrate, and a charge-generating layer disposed between the first light-emitting unit and the second light-emitting unit; the color of the light emitted by the first light-emitting unit includes the third color, the color of the light emitted by the second light-emitting unit includes the first color and the second color, the slope angle of the side of the pixel definition layer corresponding to the first sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel, and the slope angle of the side of the pixel definition layer corresponding to the second sub-pixel is greater than the slope angle of the side of the pixel definition layer corresponding to the third sub-pixel.

34. The display device of claim 32, wherein, The thickness of the electrode insulating layer of the first electrode of the third sub-pixel is greater than the thickness of the electrode insulating layer of the first electrode of the first sub-pixel, and the thickness of the electrode insulating layer of the first electrode of the first sub-pixel is greater than the thickness of the electrode insulating layer of the first electrode of the second sub-pixel.

35. The display device of any one of claims 1 to 6, wherein, The pixel definition layer is provided with a partition slot located between the openings of adjacent pixels.

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