Display panel and display device

Abstract

This application provides a display panel and a display device, solving the problem of viewing angle distortion in existing display panels. The display panel includes: a substrate; a pixel definition layer located on one side of the substrate, the pixel definition layer enclosing a pixel opening; a first light-emitting device, including a first electrode of the first light-emitting device, the first electrode of the first light-emitting device located between the pixel definition layer and the substrate; at least a portion of the first electrode of the first light-emitting device is exposed to the pixel opening, and on a first plane formed by a first direction perpendicular to the substrate and a second direction parallel to the substrate, a portion of the cross-section of the first electrode of the first light-emitting device is an inverted trapezoid, the angle between the hypotenuse of the inverted trapezoid and the second direction is less than 45 degrees, and the height of the inverted trapezoid is less than or equal to I / (2*√3), where I represents the total length of the first electrode of the first light-emitting device in the second direction.

Description

Technical Field

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

[0002] In recent years, organic electroluminescent display technology has developed rapidly. However, the display panels in this technology may suffer from viewer angle distortion when viewed from different angles, affecting the user's visual experience. Summary of the Invention

[0003] In view of this, embodiments of this application provide a display panel and a display device, which solve the problem of viewing angle distortion in the prior art.

[0004] A first aspect of this application provides a display panel, comprising: a substrate; a pixel defining layer located on one side of the substrate, the pixel defining layer enclosing a pixel opening; and a first light-emitting device, at least a portion of the first light-emitting device being located within the pixel opening; the first light-emitting device includes a first electrode of the first light-emitting device, the first electrode of the first light-emitting device being located between the pixel defining layer and the substrate; at least a portion of the first electrode of the first light-emitting device being exposed to the pixel opening; wherein, on a first plane formed by a first direction perpendicular to the substrate and a second direction parallel to the substrate, at least a portion of the cross-section of the first electrode of the first light-emitting device is an inverted trapezoid, the inverted trapezoid being exposed to the pixel opening; the angle between the hypotenuse of the inverted trapezoid and the virtual extension of the short side of the inverted trapezoid is less than 45 degrees, and the height of the inverted trapezoid is less than or equal to I / (2*√3), where I represents the total length of the orthographic projection of the cross-section of the first electrode of the first light-emitting device onto the substrate.

[0005] In conjunction with the first aspect, in some possible implementations, the virtual connecting line between the center point of the short side and the endpoint of the long side of the inverted trapezoid forms an angle of less than 30 degrees with the short side.

[0006] In conjunction with the first aspect, in some possible implementations, on the first plane, the cross-section of the first electrode of the first light-emitting device includes only an inverted trapezoid, the inverted trapezoid and the pixel opening are coaxial, and the thickness of the first electrode of the first light-emitting device is uniform.

[0007] In conjunction with the first aspect, in some possible implementations, on a second plane formed by the first direction and the third direction, the third direction is parallel to the substrate and perpendicular to the second direction, and the cross-section of the first electrode of the first light-emitting device is elongated.

[0008] In conjunction with the first aspect, in some possible implementations, the display panel further includes a planarization layer located between the substrate and the first electrode of the first light-emitting device. The planarization layer includes a groove, and a portion of the first electrode of the first light-emitting device is located within the groove. In the second direction, the two side edges of the first electrode of the first light-emitting device extend from the groove to the side of the planarization layer opposite to the substrate. In a third direction parallel to the substrate and perpendicular to the second direction, the two side edges of the first electrode of the first light-emitting device are located within the groove.

[0009] In conjunction with the first aspect, in some possible implementations, the cross-sectional shape of the groove on the first plane is an inverted trapezoid; on the second plane formed by the first direction and the third direction, the cross-sectional shape of the groove is different from the cross-sectional shape of the groove on the first plane; preferably, the cross-sectional shape of the groove on the second plane is rectangular.

[0010] In conjunction with the first aspect, in some possible implementations, in the second direction, the pixel definition layer covers both sides of the first electrode of the first light-emitting device; in the third direction, the pixel definition layer does not cover both sides of the first electrode of the first light-emitting device.

[0011] In conjunction with the first aspect, in some possible implementations, the orthographic projection shape of the pixel opening on the substrate is rectangular, and the long side of the rectangle is parallel to the second direction.

[0012] In conjunction with the first aspect, in some possible implementations, the display panel further includes a second light-emitting device, the second light-emitting device including a first electrode, wherein the cross-sectional shape of the first electrode is elongated in any plane perpendicular to the display panel; preferably, the display panel further includes a third light-emitting device, the third light-emitting device including a first electrode, wherein the cross-sectional shape of the first electrode is elongated in any plane perpendicular to the display panel; preferably, the second light-emitting device and the third light-emitting device are arranged along the second direction, the first light-emitting device being located on one side of the second and third light-emitting devices in a third direction, the third direction being perpendicular to the second direction; preferably, the first light-emitting device is a blue light-emitting device.

[0013] A second aspect of this application provides a display device, including the display panel provided in any of the above embodiments.

[0014] According to the display panel and display device provided in the embodiments of this application, by setting at least a portion of the cross-section of the first electrode of the first light-emitting device exposed to the pixel opening to be an inverted trapezoid, the light emission starting point of the first light-emitting device is switched from the long side to the short side of the inverted trapezoid, thereby increasing the emission angle of the light received from the same viewing point and accelerating the brightness decay of the first light-emitting device. When the inverted trapezoidal cross-section structure is applied to the long side direction of the pixel opening, that is, when the cross-sectional view corresponding to the cross-section line along the long side direction of the pixel opening includes the inverted trapezoidal structure, since the brightness decay is slower in the long side direction, the effect of the inverted trapezoidal cross-section structure in accelerating the brightness decay can complement the slower brightness decay effect caused by the long side, so that the brightness decay of the long side is moderate, not too fast or too slow, so as to be roughly equivalent to the brightness decay of the short side of the pixel opening, thereby avoiding viewing angle distortion when viewed from different directions. Attached Figure Description

[0015] Figure 1 This is a top view of a display panel provided in an embodiment of this application.

[0016] Figure 2 Provided for the first embodiment of this application Figure 1 A magnified view of a portion of the display panel shown.

[0017] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the display panel along line A1A2.

[0018] Figure 4 for Figure 3 The diagram shows the structure of the first electrode of the first light-emitting device in the display panel.

[0019] Figure 5 Provided for an embodiment of this application Figure 2 The diagram shows a cross-sectional view of the display panel along line B1B2.

[0020] Figure 6 Provided for the second embodiment of this application Figure 1 A magnified view of a portion of the display panel shown.

[0021] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the display panel along line C1C2.

[0022] Figure 8 Provided for the third embodiment of this application Figure 1 A magnified view of a portion of the display panel shown.

[0023] Figure 9 for Figure 8 The diagram shows a cross-sectional view of the display panel along line E1E2.

[0024] Figure 10 for Figure 8 The diagram shows a cross-sectional view of the display panel along F1F2.

[0025] Figure 11 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0026] With the continuous development of display technology, organic light-emitting diode (OLED) display panels have been widely used in various electronic devices due to their advantages such as self-illumination, wide viewing angle, high contrast and fast response speed.

[0027] However, existing OLED display panels still have some technical challenges. Particularly among the RGB colors, blue light has a relatively short lifespan, leading to color shift issues during long-term use. To address this, some products employ a V-style 3 pixel arrangement to increase the blue light aperture ratio, thereby improving blue light lifespan and reducing color shift. However, this elongated blue light pixel design results in color symmetry issues from all four angles, severely impacting the user's subjective visual experience.

[0028] In view of this, this application provides a display panel and a display device. By setting a portion of the cross-section of the first electrode of the first light-emitting device on a first plane to be an inverted trapezoid, at least a portion of the light emission starting point of the first light-emitting device is switched from the long side to the short side of the inverted trapezoid. This increases the emission angle of the light received from the same viewing point, thereby accelerating the brightness decay of the first light-emitting device. When the inverted trapezoidal cross-section structure is applied to the long side direction of the pixel opening, i.e., the cross-sectional view corresponding to the cross-sectional line along the long side direction of the pixel opening includes the inverted trapezoidal structure, since the brightness decay is slower in the long side direction, the effect of the inverted trapezoidal cross-section structure in accelerating the brightness decay can complement the slower brightness decay effect caused by the long side. This results in a moderate brightness decay on the long side, neither too fast nor too slow, roughly equivalent to the brightness decay on the short side of the pixel opening, thereby avoiding viewing angle distortion when viewed from different directions.

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. It is understood that when a structure is referred to as being "on" or "below" another structure, the structure may be directly on or below the other structure, or there may be intermediate structures. The same reference numerals always indicate the same structure. Structures referred to herein include any of the following: membrane, element, device, component, assembly.

[0031] When a structure is referred to as being “connected” to another structure, it can be directly connected to the other structure or indirectly connected to the other structure by means of one or more intermediate structures placed between them.

[0032] 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.

[0033] Figure 1 This is a top view of a display panel provided in an embodiment of this application. Figure 2 Provided for the first embodiment of this application Figure 1 A magnified view of a portion of the display panel shown. Figure 3 for Figure 2 The diagram shows a cross-sectional view of the display panel along line A1A2. Figure 4 for Figure 3 The diagram shows the structure of the first electrode of the first light-emitting device in the display panel.

[0034] Combination Figures 1-4 As shown, the display panel includes: a substrate 10, a pixel definition layer 20, and a first light-emitting device 30. The pixel definition layer 20 is located on one side of the substrate 10, enclosing a pixel opening H. At least a portion of the first light-emitting device 30 is located within the pixel opening H. The first light-emitting device 30 includes a first electrode 31, which is located between the pixel definition layer 20 and the substrate 10, with at least a portion exposed to the pixel opening H. For example, the entire first electrode 31 may be exposed to the pixel opening H, meaning the entire first electrode 31 is visible through the pixel opening H, and the human eye can see the complete first electrode 31 through the pixel opening H. Alternatively, a portion of the first electrode 31 may be exposed to the pixel opening H, while another portion is not visible from the pixel opening H.

[0035] In this design, on a first plane formed by a first direction x perpendicular to the substrate 10 and a second direction y parallel to the substrate 10, at least a portion of the cross-section of the first electrode 31 of the first light-emitting device is inverted trapezoidal, and the inverted trapezoid is exposed at the pixel opening H. The angle θ1 between the hypotenuse and the virtual extension of the short side of the inverted trapezoid is less than 45 degrees, and the height h of the inverted trapezoid is less than or equal to I / (2*√3), where I represents the total length of the orthographic projection of the cross-section of the first electrode 31 of the first light-emitting device on the first plane onto the substrate 10. For example, the angle θ1 is 30 degrees, 35 degrees, 40 degrees, etc. For example, the height h is 0.28I, 0.26I, etc.

[0036] The substrate 10 can be an array substrate or a substrate. The array substrate includes a substrate and a pixel circuit array formed on the substrate. The pixel circuit array includes pixel circuits arranged in an array. The pixel circuits are electrically connected to light-emitting devices (including a first light-emitting device 30, and a second light-emitting device 40 and a third light-emitting device 50 mentioned later). The pixel circuits drive the light-emitting devices to emit light at a predetermined brightness. For example, the pixel circuit can be a 7T1C, 8T1C, etc. The transistors in the pixel circuit include at least one of polysilicon oxide thin-film transistors and metal oxide thin-film transistors.

[0037] In some embodiments, the substrate may be a glass substrate. In some embodiments, the substrate may include an organic resin material such as epoxy resin, triazine, silicone resin, or polyimide. In some embodiments, the substrate may include a ceramic material such as silicon nitride, aluminum nitride, or aluminum oxide, or include a metal or metal compound. The substrate has good light transmittance and mechanical strength to provide support.

[0038] The pixel definition layer 20 can be made of organic or inorganic materials. Organic materials can be photoresist, polyimide, etc. Inorganic materials can be silicon oxide, silicon nitride, etc. The pixel definition layer 20 encloses a pixel opening H, which is used to define the light-emitting area.

[0039] The first light-emitting device 30 can be an organic light-emitting diode (OLED), a micro light-emitting diode (Micro LED), a quantum dot light-emitting diode (QLED), etc. The first light-emitting device 30 can include light-emitting devices of various colors, such as a red light-emitting device R, a green light-emitting device G, a blue light-emitting device B, etc.

[0040] The first light-emitting device 30 includes a first electrode 31, at least one light-emitting functional layer 32, and a second electrode 33, sequentially stacked along a direction gradually moving away from the substrate 10. Exemplarily, the first electrode 31 is the anode, and the second electrode 33 is the cathode. Alternatively, the first electrode 31 is the cathode, and the second electrode 33 is the anode. The first electrode 31 can be made of a conductive material, such as a metallic material like aluminum, silver, copper, or gold, or a transparent conductive material like indium tin oxide or indium zinc oxide. Exemplarily, the first electrode 31 employs a three-layer composite structure of an indium tin oxide layer, a silver layer, and an indium tin oxide layer. The material of the second electrode 33 needs to possess high conductivity and a low work function (to facilitate electron injection). Exemplarily, the material of the second electrode 33 includes aluminum, a magnesium-silver alloy, etc.

[0041] At least one first light-emitting device light-emitting functional layer 32 includes a light-emitting layer, and may further include at least one of a hole injection layer (HIL), a hole transport layer (HTL), and an electron blocking layer (EBL) located between the anode and the light-emitting layer, and at least one of an electron injection layer (EIL), an electron transport layer (ETL), and a hole blocking layer (HBL) located between the cathode and the light-emitting layer. A first electrode 31 of the first light-emitting device is located between the substrate 10 and the pixel definition layer 20, and at least a portion of the first electrode 31 is exposed to the pixel opening H. The display panel may include multiple light-emitting devices, and at least one light-emitting functional layer of adjacent light-emitting devices may be a common layer or may be disconnected from each other. For example, the light-emitting functional layers of adjacent light-emitting devices may be disconnected from each other; in this case, the light-emitting functional layers are located within the pixel opening H. A second electrode 33 of the first light-emitting device is located within the pixel opening H, or may be shared by adjacent light-emitting devices to form a common layer.

[0042] On the first plane, at least a portion of the cross-section of the first electrode 31 of the first light-emitting device is an inverted trapezoid, and the inverted trapezoid is exposed to the pixel opening H. That is, the cross-section of the first electrode 31 of the first light-emitting device exposed to the pixel opening H on the first plane includes the inverted trapezoid. In this case, on opposite sides of the first light-emitting device 30 in the second direction y, taking one side as an example, the light emission angle changes from the conventional first light emission angle θ3 to a second light emission angle θ4, where θ3 < θ4, that is, the light emission angle increases. This causes the brightness of the first light-emitting device 30 to decay more quickly, thereby offsetting the viewing angle distortion problem caused by the higher brightness of the first light-emitting device 30 in the second direction y compared to other directions. Furthermore, by setting the angle θ1 between the hypotenuse bc and the virtual extension of the short side cd of the inverted trapezoid to be less than 45 degrees, and the height h of the inverted trapezoid to be less than or equal to I / (2*√3), it is ensured that the total length I of the first electrode 31 of the first light-emitting device in the second direction y is greater than the length of the long side of the trapezoid. That is, in addition to the inverted trapezoidal structure, the cross-section of the first electrode 31 of the first light-emitting device on the first plane can also include a planar structure. The planar structure is located on both sides of the inverted trapezoidal structure so that the pixel definition layer 20 can cover the edge of the first electrode 31 of the first light-emitting device, making the structure more stable.

[0043] In one embodiment, such as Figure 4 As shown, the virtual connecting line ab between the center point a of the short side and the endpoint b of the long side of the inverted trapezoid and the short side cd makes an angle θ2 less than 30 degrees. For example, the angle θ2 can be 28 degrees, 25 degrees, 23 degrees, 20 degrees, etc. The advantage is that it ensures the light emission angle of the first light-emitting device 30 on either side of the second direction y matches the side length of the first light-emitting device 30 in the second direction y. This ensures that the rate attenuation of brightness due to an increased light emission angle matches the rate attenuation due to a longer side, making the overall brightness attenuation of the long side almost the same as that of the short side, thus avoiding visual distortion. At the same time, this angle range makes the slope of the inverted trapezoid's hypotenuse gentler, resulting in a smaller change in the light emission angle, which is less noticeable to the human eye and more eye-friendly.

[0044] In one embodiment, combined Figure 2 and Figure 3As shown, on the first plane, the cross-section of the first electrode 31 of the first light-emitting device includes only an inverted trapezoid, and the inverted trapezoid and the pixel opening H are coaxial with the axis L. The thickness of the first electrode 31 of the first light-emitting device is uniform. It should be noted that the uniform thickness of the first electrode 31 of the first light-emitting device means that the first electrode 31 of the first light-emitting device is fabricated synchronously as a whole, and the slight difference in thickness due to process precision or structure can be ignored. The advantages of this setting are that, on the one hand, with an inverted trapezoid and a uniform thickness of the first electrode 31, the first electrode 31 of the first light-emitting device can be fabricated in one film deposition process, which is simple and easy to implement; on the other hand, the inverted trapezoid and the pixel opening H are coaxial with the axis L, making the light emission angle of the first light-emitting device 30 symmetrical, further avoiding viewpoint color deviation; and thirdly, it ensures the uniformity of the electrical performance of the first electrode 31 of the first light-emitting device.

[0045] In one embodiment, the first light-emitting device 30 is a blue light-emitting device B. Since the lifespan of the blue light-emitting device B is relatively short among the RGB colors, some products use a long, narrow design for the blue light emission to increase the blue light aperture ratio and thus improve the inconsistent lifespan issue. However, the long, narrow design can cause color distortion in all four directions, affecting the subjective visual effect. By designing the first electrode 31 of the first light-emitting device of the blue light-emitting device B as an inverted trapezoidal cross-section structure, the color distortion problem caused by the long, narrow blue light-emitting device B design is mitigated.

[0046] Figure 5 Provided for an embodiment of this application Figure 2 The diagram shows a cross-sectional view of the display panel along line B1B2. (Combined with...) Figure 2 and Figure 5 As shown, on the second plane formed by the first direction x and the third direction z, the cross-section of the first electrode 31 of the first light-emitting device is elongated. The third direction z is parallel to the substrate 10 and perpendicular to the second direction y. For example, if the second direction y is longitudinal and the third direction z is transverse, then the cross-section of the first electrode 31 of the first light-emitting device in the second direction y includes an inverted trapezoid, and the cross-section in the third direction z is elongated, with different shapes for the transverse and longitudinal cross-sections. The advantage is that this allows for differentiated settings of the cross-sectional pattern of the first electrode 31 of the first light-emitting device, which is beneficial for optimizing the optical performance of the first electrode 31.

[0047] In one embodiment, the display panel further includes a planarization layer 60 located between the substrate 10 and the first electrode 31 of the first light-emitting device. The planarization layer 60 includes a recess G, and a portion of the first electrode 31 of the first light-emitting device is located within the recess G. Figure 3 As shown, in the second direction y, the two side edges of the first electrode 31 of the first light-emitting device extend from the groove G to the side of the planarization layer 60 facing away from the substrate 10. Figure 5As shown, on a third direction z that is parallel to the substrate 10 and perpendicular to the second direction y, the two side edges of the first electrode 31 of the first light-emitting device are located in the groove G.

[0048] For example, the planarization layer 60 is formed of a polyimide material, which has good planarization effect and insulation properties.

[0049] For example, in combination Figure 2 , Figure 3 and Figure 5 As shown, the first electrode 31 of the first light-emitting device includes a first portion 311, a second portion 312, and a third portion 313 connected sequentially along the second direction y. The second portion 312 is located within a groove G, and the first portion 311 and the third portion 313 are located on the side of the planarization layer 60 facing away from the substrate 10. The cross-sectional shape of the second portion 312 on the first plane is an inverted trapezoid, and the cross-sectional shapes of the first portion 311 and the third portion 313 on the first plane are elongated. Thus, the groove G is used to define the shape of the second portion 312 to present an inverted trapezoidal cross-section. Exemplarily, an additional process can be added during the conventional display panel manufacturing process, namely, slotting on the planarization layer 60, and then fabricating the first electrode 31 of the first light-emitting device within the groove G.

[0050] For example, in the third direction z, the two side edges of the first electrode 31 of the first light-emitting device are in contact with the inner wall of the groove G. This has the advantage that, on the one hand, the side walls of the groove G in the third direction z can be used to define the edges of the first electrode 31 of the first light-emitting device, with the groove G acting as a limiting element. On the other hand, it allows for a good interfacial bond between the first electrode 31 of the first light-emitting device and the planarization layer 60, improving the stability of the first electrode 31 of the first light-emitting device.

[0051] In one embodiment, such as Figure 3 As shown, on the first plane formed by the first direction x and the second direction y, the cross-sectional shape of the groove G is an inverted trapezoid. Figure 5 As shown, the cross-sectional shape of the groove G on the second plane formed by the first direction x and the third direction z is different from the cross-sectional shape of the groove G on the first plane. For example, the cross-sectional shape of the groove G on the second plane is rectangular. The advantage is that, compared to a groove G whose cross-sectional shape on the second plane is also an inverted trapezoid, designing the groove G to have a rectangular cross-sectional shape on the second plane makes it easier to control the parameters at the corners of the groove G, resulting in higher accuracy.

[0052] For example, such as Figure 3As shown, the depth of the groove G is 1 / 3 to 2 / 3 of the thickness of the planarization layer 60. For example, the depth of the groove G is 1 / 2 of the thickness of the planarization layer 60. The advantage is that it avoids the planarization layer 60 below the groove G being too thin, which would not achieve the planarization effect on the structure in the substrate 10, while still meeting the light emission angle requirements of the first electrode 31 of the first light-emitting device.

[0053] In one embodiment, such as Figure 3 As shown, in the second direction y, the pixel definition layer 20 covers both sides of the first electrode 31 of the first light-emitting device. Figure 5 As shown, in the third direction z, the pixel definition layer 20 does not cover the two side edges of the first electrode 31 of the first light-emitting device. For example, the edge line of the pixel opening H projected onto the substrate 10 along the second direction y coincides with the edge line of the opening of the groove G projected onto the substrate 10 along the second direction y. This has the advantage of making the coverage of the first electrode 31 of the first light-emitting device by the pixel definition layer 20 directional, which is beneficial for optimizing the electrical and optical performance of the first electrode 31.

[0054] In one embodiment, such as Figure 2 As shown, the orthographic projection of the pixel opening H onto the substrate 10 is rectangular, with the long side of the rectangle parallel to the second direction y. The rectangle mentioned here includes right-angled rectangles and rounded rectangles. For example, the ratio of the long side to the short side of the rectangle is greater than or equal to 1.5:1. For instance, the ratio of the long side to the short side of the rectangle is 2:1. The rectangular pixel opening H design gives it a good geometric shape, which is beneficial for improving the aperture ratio and display effect of the display panel. At the same time, by setting the long side of the rectangle to be parallel to the second direction y, the advantage is that, since the brightness decay is slower along the long side, the accelerated brightness decay effect of the inverted trapezoidal cross-section structure can complement the slower brightness decay effect caused by the long side, thus making the brightness decay of the long side moderate, neither too fast nor too slow, so that it is roughly equivalent to the brightness decay of the short side of the pixel opening, thereby avoiding viewing angle distortion when viewed from different directions.

[0055] Figure 6 Provided for the second embodiment of this application Figure 1 A magnified view of a portion of the display panel shown. Figure 7 for Figure 6 The diagram shows a cross-sectional view of the display panel along line C1C2. Figure 6 The cross-sectional view of the display panel along line D1D2 shown is as follows: Figure 3 Same. Combined Figure 6 , Figure 7 and Figure 3 The display panel shown is Figure 2 , Figure 5The difference in the display panel shown is that, in this embodiment, the pixel definition layer 20 covers the four edges of the first electrode 31 of the first light-emitting device.

[0056] For example, in combination Figure 6 and Figure 3 As shown, on the first plane, the two side edges of the first electrode 31 of the first light-emitting device extend from the pixel opening H to the side of the planarization layer 60 facing away from the substrate 10. Combined with... Figure 6 and Figure 7 As shown, on the second plane, the two side edges of the first electrode 31 of the first light-emitting device extend from the pixel opening H to the side of the planarization layer 60 facing away from the substrate 10. The pixel definition layer 20 covers the edge region of the first electrode 31 located on the side of the planarization layer 60 facing away from the substrate 10.

[0057] Specifically, combined Figure 6 and Figure 3 As shown, on the first plane, the cross-sectional shape of the first electrode 31 of the first light-emitting device includes a first elongated strip, an inverted trapezoid, and a second elongated strip connected in sequence. Combined with... Figure 6 and Figure 7 As shown, on the second plane, the cross-sectional shape of the first electrode 31 of the first light-emitting device is a polygonal shape.

[0058] For example, in combination Figure 6 , Figure 7 and Figure 3 As shown, the pixel definition layer 20 covers the first electrode 31 of the first light-emitting device with the same width in different directions. For example, the width of the pixel definition layer 20 covering opposite sides of the first electrode 31 of the first light-emitting device in the second direction y is equal to the width of the pixel definition layer 20 covering opposite sides of the first electrode 31 of the first light-emitting device in the third direction z. The advantage is that it ensures structural stability.

[0059] Figure 8 Provided for the third embodiment of this application Figure 1 A magnified view of a portion of the display panel shown. Figure 9 for Figure 8 The diagram shows a cross-sectional view of the display panel along line E1E2. Figure 10 for Figure 8 The diagram shows a cross-sectional view of the display panel along F1F2. Figure 8 The difference between the display panel shown and the display panel provided in any of the above embodiments is that, in this embodiment, the display panel further includes a second light-emitting device 40. The second light-emitting device 40 includes a first electrode 41. On any plane perpendicular to the display panel, the cross-sectional shape of the first electrode 41 is elongated, such as... Figure 9 As shown.

[0060] For example, the first electrode 41 of the second light-emitting device is located on the side of the planarization layer 60 away from the substrate 10, and the first electrode 41 of the second light-emitting device is parallel to the substrate 10. The pixel definition layer 20 covers the four edges of the first electrode 41 of the second light-emitting device.

[0061] The second light-emitting device 40 further includes at least one second light-emitting device light-emitting functional layer 42 and a second light-emitting device second electrode 43. The second light-emitting device light-emitting functional layer 42 is located within the pixel opening H, or the second light-emitting device light-emitting functional layer 42 extends from within the pixel opening H to the side of the pixel definition layer 20 facing away from the substrate 10. The second light-emitting device second electrode 43 and the first light-emitting device second electrode 33 are connected to form a common layer.

[0062] In one embodiment, combined Figure 8 and Figure 10 As shown, the display panel also includes a third light-emitting device 50, which includes a first electrode 51. On any plane perpendicular to the display panel, the cross-sectional shape of the first electrode 51 is elongated.

[0063] For example, the first electrode 51 of the third light-emitting device is located on the side of the planarization layer 60 away from the substrate 10, and the first electrode 51 of the third light-emitting device is parallel to the substrate 10. The pixel definition layer 20 covers the four edges of the first electrode 51 of the third light-emitting device.

[0064] The third light-emitting device 50 further includes at least one third light-emitting device light-emitting functional layer 52 and a third light-emitting device second electrode 53. The third light-emitting device light-emitting functional layer 52 is located within the pixel opening H, or the third light-emitting device light-emitting functional layer 52 extends from within the pixel opening H to the side of the pixel definition layer 20 facing away from the substrate 10. The third light-emitting device second electrode 53, the second light-emitting device second electrode 43, and the first light-emitting device second electrode 33 are connected to form a common layer.

[0065] For example, the first electrode 31 of the first light-emitting device, the first electrode 41 of the second light-emitting device, and the first electrode 51 of the third light-emitting device all adopt a triple-layer composite structure of indium tin oxide layer, silver layer, and indium tin oxide layer, and the three have the same thickness.

[0066] In one embodiment, such as Figure 8 As shown, the second light-emitting device 40 and the third light-emitting device 50 are arranged along the second direction y, and the first light-emitting device 30 is located on the side of the second light-emitting device 40 and the third light-emitting device 50 along the third direction z, which is perpendicular to the second direction y. For example, the aperture ratio of the first light-emitting device 30 is greater than or equal to the sum of the aperture ratios of the second light-emitting device 40 and the third light-emitting device 50. This pixel arrangement allows the three light-emitting devices to be closely aligned, improving the pixel density and resolution of the display panel.

[0067] For example, the first light-emitting device 30 includes a blue light-emitting device B, the second light-emitting device 40 includes a red light-emitting device R, and the third light-emitting device 50 includes a green light-emitting device G. This design enables the display panel to achieve full-color display.

[0068] In one embodiment, the display panel further includes a packaging structure located on the side of the light-emitting devices (including a first light-emitting device 30, a second light-emitting device 40, and a third light-emitting device 50) facing away from the substrate 10.

[0069] For example, the encapsulation structure employs thin-film encapsulation. Thin-film encapsulation typically uses a composite structure with multiple alternating inorganic and organic layers. The inorganic layers are the core barrier against water and oxygen, requiring density and the absence of pinholes. The materials for the inorganic layers can be oxides or nitrides. For example, oxides include alumina, silicon oxide, zinc oxide, etc., prepared by atomic layer deposition (ALD) or chemical vapor deposition (CVD), exhibiting excellent barrier properties. Nitrates include materials such as silicon nitride (SiN). x This material, prepared via plasma-enhanced chemical vapor deposition (PECVD), exhibits high mechanical strength. The organic layer serves to buffer stress, cover defects in the inorganic layer, and provide a planarized surface. Exemplary materials for the organic layer include polyimide (PI), acrylic resin, and parylene, which are formed into a film via solution spin coating or inkjet printing.

[0070] For example, the encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked sequentially along a direction away from the substrate 10. The orthographic projections of the first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer onto the substrate 10 all cover the orthographic projection of the light-emitting device onto the substrate 10, and the orthographic projection of the organic encapsulation layer onto the substrate 10 is located within the range of the orthographic projections of the first and second inorganic encapsulation layers onto the substrate 10. In one embodiment, the display panel includes a display area and a border area surrounding the display area, the light-emitting device is located in the display area, and the first and second inorganic encapsulation layers are in contact in the border area.

[0071] This application also provides a display device. Figure 11 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 11 As shown, the display device 1100 includes the display panel provided in any of the above embodiments.

[0072] Display device 1100 is a product with image display function. For example, display device 1100 can be used to display static images, such as pictures or photographs. Display device 1100 can also be used to display moving images, such as videos.

[0073] Display device 1100 may be a laptop, mobile phone, handheld or portable computer, camera, camcorder, in-vehicle smart central control screen, calculator, smartwatch, GPS navigator, electronic photo, electronic billboard or sign, projector, etc.

[0074] In addition, the display device 1100 can also perform functions such as taking photos, recording videos, fingerprint recognition, and facial recognition. Accordingly, the display device 1100 also includes at least one functional module for implementing the above functions, such as an under-display camera or an under-display fingerprint recognition sensor.

[0075] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0076] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A display panel, characterized in that, include: substrate; A pixel definition layer is located on one side of the substrate, and the pixel definition layer encloses a pixel opening; The first light-emitting device is at least partially located within the pixel opening; The first light-emitting device includes a first electrode, which is located between the pixel definition layer and the substrate; At least a portion of the first electrode of the first light-emitting device is exposed to the pixel opening; Wherein, on a first plane formed by a first direction perpendicular to the substrate and a second direction parallel to the substrate, at least a portion of the cross-section of the first electrode of the first light-emitting device is an inverted trapezoid, the inverted trapezoid being exposed to the pixel opening; the angle between the hypotenuse of the inverted trapezoid and the virtual extension of the short side of the inverted trapezoid is less than 45 degrees, and the height of the inverted trapezoid is less than or equal to I / (2*√3), where I represents the total length of the orthographic projection of the cross-section of the first electrode of the first light-emitting device on the substrate.

2. The display panel according to claim 1, characterized in that, The virtual connecting line between the center point of the short side and the endpoint of the long side of the inverted trapezoid forms an angle of less than 30 degrees with the short side.

3. The display panel according to claim 1, characterized in that, On the first plane, the cross-section of the first electrode of the first light-emitting device includes only an inverted trapezoid, the inverted trapezoid and the pixel opening are coaxial, and the thickness of the first electrode of the first light-emitting device is uniform.

4. The display panel according to claim 1, characterized in that, On the second plane formed by the first direction and the third direction, the third direction is parallel to the substrate and perpendicular to the second direction, and the cross-section of the first electrode of the first light-emitting device is elongated.

5. The display panel according to claim 1, characterized in that, It also includes a planarization layer located between the substrate and the first electrode of the first light-emitting device. The planarization layer includes a groove, and a portion of the first electrode of the first light-emitting device is located within the groove. In the second direction, the two side edges of the first electrode of the first light-emitting device extend from the groove to the side of the planarization layer away from the substrate. In a third direction parallel to the substrate and perpendicular to the second direction, the two side edges of the first electrode of the first light-emitting device are located within the groove.

6. The display panel according to claim 5, characterized in that, On the first plane, the cross-sectional shape of the groove is an inverted trapezoid; on the second plane formed by the first direction and the third direction, the cross-sectional shape of the groove is different from the cross-sectional shape of the groove on the first plane. Preferably, the cross-sectional shape of the groove on the second plane is rectangular.

7. The display panel according to claim 5 or 6, characterized in that, In the second direction, the pixel definition layer covers both sides of the first electrode of the first light-emitting device; in the third direction, the pixel definition layer does not cover both sides of the first electrode of the first light-emitting device.

8. The display panel according to claim 1, characterized in that, The orthographic projection of the pixel opening onto the substrate is rectangular, with the long side of the rectangle parallel to the second direction.

9. The display panel according to claim 1, characterized in that, It also includes a second light-emitting device, which includes a first electrode of the second light-emitting device. On any plane perpendicular to the display panel, the cross-sectional shape of the first electrode of the second light-emitting device is always elongated. Preferably, the display panel further includes a third light-emitting device, the third light-emitting device including a first electrode of the third light-emitting device, and the cross-sectional shape of the first electrode of the third light-emitting device is elongated on any plane perpendicular to the display panel; Preferably, the second light-emitting device and the third light-emitting device are arranged along the second direction, and the first light-emitting device is located on the side of the second light-emitting device and the third light-emitting device facing a third direction, which is perpendicular to the second direction; Preferably, the first light-emitting device is a blue light-emitting device.

10. A display device, characterized in that, The display panel includes any one of claims 1-9.

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