A display panel and display device

Abstract

Embodiments of the present application provide a display panel and a display device. The display panel comprises a substrate, a metal portion located above the substrate, and a plurality of light emitting elements located on a side of the metal portion away from the substrate, the light emitting elements comprising a first electrode, a light emitting layer and a second electrode stacked in sequence along a light emitting direction of the display panel, wherein a footprint of the metal portion on the substrate covers a footprint of the light emitting layer on the substrate. In the embodiments of the present application, the first electrode has a relatively flat surface, so that the probability of interference between ambient light reflected by the first electrode is reduced, the color dispersion phenomenon of the display panel in a dark state is improved, and the appearance quality is improved. Meanwhile, the relatively flat first electrode can also reduce the color difference of the color of the pixel light emitting area at different viewing angles, improve the color deviation problem of the display panel at a large viewing angle, and improve the display effect.

Description

[0001] This application is a divisional application of a patent application with the application date of January 29, 2021, the application number of 202110130088.9, and the invention title of "a display panel and display device". TECHNICAL FIELD

[0002] The present application relates to the technical field of display, in particular to a display panel and display device. BACKGROUND

[0003] In the organic light emitting display device, an organic light emitting diode (OLED) is used as a light emitting element, which has the characteristic of self-luminescence, does not need to set an additional light source, is beneficial to the light and thin of the whole display device, and can realize the manufacturing of a flexible display screen. In addition, the organic self-luminescence display technology also has the characteristics of fast response speed, wide viewing angle, etc., and thus becomes the focus of current research.

[0004] The current organic light emitting display panel has obvious color dispersion phenomenon under external environment light, which affects the appearance quality of the product. SUMMARY

[0005] The embodiments of the present application provide a display panel and display device to solve the color dispersion problem of the display panel under ambient light in the prior art and improve the appearance quality of the product.

[0006] The embodiments of the present application provide a display panel, comprising: a substrate;

[0007] A metal part is located above the substrate;

[0008] A plurality of light emitting elements are located on the side of the metal part away from the substrate, and the light emitting element comprises a first electrode, a light emitting layer and a second electrode stacked in turn along the light emitting direction of the display panel; wherein,

[0009] The metal part covers the first electrode on the substrate in the orthographic projection.

[0010] In some embodiments, the display panel further comprises a color film layer located on the side of the light emitting element away from the substrate; the color film layer comprises a plurality of light filtering units and a light shielding part, the light shielding part defines a plurality of first openings, and the projection of the light filtering unit on the plane where the light shielding part is located covers the first opening; along the light emitting direction of the display panel, the first opening overlaps with the light emitting element, and the projection of the metal part on the color film layer covers the first opening.

[0011] Further, the manufacturing material of the metal part comprises a light absorbing material.

[0012] Specifically, along the light emitting direction of the display panel, the projection of the first electrode on the color film layer is located in the first opening.

[0013] In some embodiments, the display panel further comprises a color filter layer located on a side of the light emitting element away from the substrate; the color filter layer comprises a plurality of light filtering units and a light shielding portion, the light shielding portion defines a plurality of first openings, a projection of the light filtering unit on a plane where the light shielding portion is located covers the first openings; along a light emitting direction of the display panel, the first openings overlap the light emitting element, and a projection of the first electrode on the color filter layer covers the first openings.

[0014] In some embodiments, the display panel further comprises a pixel definition layer, the pixel definition layer comprises a plurality of second openings, the second openings expose the first electrode, and the light emitting layer is located in the second openings; a material for manufacturing the pixel definition layer comprises a light-transmitting material.

[0015] In some embodiments, the display panel further comprises a pixel definition layer, the pixel definition layer comprises a plurality of second openings, the second openings expose the first electrode, and the light emitting layer is located in the second openings; a material for manufacturing the pixel definition layer comprises a light-transmitting material.

[0016] In an embodiment, a side wall of the second opening has a non-right angle with a plane where the substrate is located; a projection of the first electrode on the substrate covers a projection of the side wall on the substrate.

[0017] In an embodiment, a side wall of the second opening has a non-right angle with a plane where the substrate is located; a projection of the first electrode on the substrate covers a projection of the side wall on the substrate.

[0018] Specifically, the shape of the metal portion is the same as the shape of the first electrode.

[0019] In an embodiment, the display panel comprises a first metal layer and a second metal layer located above the substrate, the thickness of the second metal layer is greater than the thickness of the first metal layer; wherein the metal portion is located in the second metal layer.

[0020] In an embodiment, the display panel comprises at least two metal layers between the substrate and the light emitting element, wherein the metal portion is located in the metal layer closest to the light emitting element in a light emitting direction of the display panel.

[0021] In an embodiment, the display panel further comprises an organic insulating layer, the organic insulating layer is in contact with and covers the metal portion.

[0022] In an embodiment, the display panel comprises an inorganic insulating layer and an organic insulating layer, the inorganic insulating layer is in contact with and covers the metal portion, and the organic insulating layer is in contact with and covers the inorganic insulating layer.

[0023] In some embodiments, the metal portion is not connected to an electric potential.

[0024] In some embodiments, the metal portion is multiplexed as a signal line in the display panel.

[0025] The display device provided by the embodiment of the present application comprises the display panel provided by any of the embodiments of the present application.

[0026] The display panel and the display device provided by the embodiment of the present application have the following beneficial effects.

[0027] The metal part located directly below the light-emitting element covers the orthographic projection of the first electrode on the substrate, and the first electrode is made directly above the area corresponding to the metal part. During the manufacturing of the display panel, the metal part can provide a relatively flat substrate for the manufacturing of the first electrode, so that the manufactured first electrode has a relatively flat surface, that is, the first electrode 31 has a relatively flat surface in the display panel provided by the embodiment of the present application, and the probability of interference between the ambient light reflected by the first electrode 31 is reduced, the color dispersion phenomenon of the display panel in the dark state is improved, and the appearance quality is improved. At the same time, the relatively flat first electrode 31 can also reduce the color difference of the color of the pixel light-emitting area at different viewing angles, improve the color deviation problem of the display panel with a large viewing angle, and improve the display effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 It is a cross-sectional simplified schematic diagram of a display panel in the related art;

[0030] Figure 2 It is a schematic diagram of a display panel provided by the embodiment of the present application;

[0031] Figure 3 It is Figure 2 It is a cross-sectional schematic diagram at the position of tangent A-A' in the display panel;

[0032] Figure 4 It is Figure 2 It is a top view schematic diagram at the position of area Q in the display panel;

[0033] Figure 5 It is a partial top view schematic diagram of a color film layer in another display panel provided by the embodiment of the present application;

[0034] Figure 6 It is Figure 2 It is another cross-sectional schematic diagram at the position of tangent A-A' in the display panel;

[0035] Figure 7 It is Figure 2Another cross-sectional schematic view at the location of the tangent A-A';

[0036] Figure 8 For Figure 2 Another cross-sectional schematic view at the location of the tangent A-A';

[0037] Figure 9 For Figure 2 Another cross-sectional schematic view at the location of the tangent A-A';

[0038] Figure 10 For Figure 1 ;

[0039] Figure 11 For Figure 2 ;

[0040] Figure 12 Another cross-sectional schematic view of another display panel provided by the embodiment of the present application;

[0041] Figure 13 Another cross-sectional schematic view of another display panel provided by the embodiment of the present application;

[0042] Figure 14 Another cross-sectional schematic view of another display panel provided by the embodiment of the present application;

[0043] Figure 15 A schematic view of a display device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0045] The terms used in the embodiments of the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0046] Figure 1 A simplified schematic view of a cross section of a display panel in the related art. As Figure 1As shown, a signal trace 2 is arranged directly below the light emitting element 1. Since the signal trace 2 has a certain width and thickness, the insulating layer 3 made above the signal trace 2 cannot form a flat surface, which results in the anode 4 of the light emitting element 1 made directly above the position corresponding to the signal trace 2 not being flat, and the anode 4 having a non-flat surface. The non-flat surface of the anode 4 also results in the light emitting layer 5 and the cathode 6 made thereon not being flat. The anode 4 in the light emitting element 1 is usually a reflective anode, and the anode 4 has a high reflectivity to light. The ambient light penetrating through the partial film layers of the display panel or the ambient light can be reflected by the anode 4, and the ambient light reflected at different positions of the non-flat anode 4 can interfere with each other, causing color separation and dispersion. Especially when the display panel is in a dark state, the dispersion phenomenon caused by the non-flat anode 4 reflecting the ambient light can be very obvious, and seriously affects the appearance quality of the product. In addition, the non-flat anode 4 also causes the color of the pixel light emitting region at a viewing angle S1 to be different from the color of the pixel light emitting region at a viewing angle S2, that is, the non-flat anode 4 causes the display panel to have a large viewing angle color deviation problem, affecting the display effect.

[0047] Based on the problems in the related art, the embodiments of the present application provide a display panel, a large-area metal part is designed below a light emitting element, so that a first electrode of the light emitting element close to the metal part is made on a relatively flat surface, to improve the dispersion phenomenon caused by the display panel reflecting ambient light, and improve the appearance quality of the product. At the same time, the large viewing angle color deviation problem of the display panel is improved, and the display effect is improved.

[0048] Figure 2 A schematic view of a display panel provided by the embodiments of the present application is shown in FIG. 1. Figure 3 As shown in FIG. 1, the display panel includes a display area AA and a non-display area BA, the non-display area BA is arranged around the display area AA, and the display area AA includes a plurality of sub-pixels sp, and one sub-pixel sp includes one light emitting element 30. Figure 2 A cross-sectional view at a tangent position A-A' in FIG. 1 is shown in FIG. 2. Figure 4 As shown in FIG. 2, the display panel includes a substrate 10, a metal part 20, and a plurality of light emitting elements 30. Figure 2 A top view at a region Q position in FIG. 1 is shown in FIG. 3.

[0049] As shown in FIG. 1, the display panel includes a display area AA and a non-display area BA, the non-display area BA is arranged around the display area AA, and the display area AA includes a plurality of sub-pixels sp, and one sub-pixel sp includes one light emitting element 30. Figure 2 As shown in FIG. 1, the display panel includes a display area AA and a non-display area BA, the non-display area BA is arranged around the display area AA, and the display area AA includes a plurality of sub-pixels sp, and one sub-pixel sp includes one light emitting element 30.

[0050] As shown in FIG. 1, the display panel includes a display area AA and a non-display area BA, the non-display area BA is arranged around the display area AA, and the display area AA includes a plurality of sub-pixels sp, and one sub-pixel sp includes one light emitting element 30. Figure 3 As shown in FIG. 1, the display panel includes a display area AA and a non-display area BA, the non-display area BA is arranged around the display area AA, and the display area AA includes a plurality of sub-pixels sp, and one sub-pixel sp includes one light emitting element 30. Figure 3 As shown in FIG. 1, the display panel includes a display area AA and a non-display area BA, the non-display area BA is arranged around the display area AA, and the display area AA includes a plurality of sub-pixels sp, and one sub-pixel sp includes one light emitting element 30. Figure 3(Only one is shown in the diagram). The metal portion 20 is located on the substrate 10, and the light-emitting element 30 is located on the side of the metal portion 20 away from the substrate 10; that is, when viewing the display panel from a normal angle, the metal portion 20 is below the light-emitting element 30. The light-emitting element 30 includes a first electrode 31, a light-emitting layer 32, and a second electrode 33 stacked sequentially along the light-emitting direction e of the display panel. During the display panel manufacturing process, the metal portion 20 is fabricated on the substrate 10, and the light-emitting element 30 is fabricated after the metal portion 20 is fabricated; that is, the first electrode 31, the light-emitting layer 32, and the second electrode 33 are sequentially fabricated on the metal portion 20. Specifically, the first electrode 31 is a reflective electrode, the second electrode 33 is a transparent electrode, and the light-emitting direction of the light-emitting element 30 is from the first electrode 31 to the second electrode 33. Some light emitted from the light-emitting layer 32 is directly emitted towards the second electrode 33, while some light emitted from the light-emitting layer 32 that is emitted towards the first electrode 31 can be reflected by the first electrode 31 and then penetrate the second electrode 33 before being emitted, thereby ensuring the light-emitting efficiency of the light-emitting element 30.

[0051] In one embodiment, the first electrode 31 is a reflective anode, and the second electrode 33 is a transparent cathode. The display panel also includes pixel circuitry located on the substrate 10. Figure 3 (Not shown), the pixel circuit is electrically connected to the light-emitting element 30, and the pixel circuit is used to drive the light-emitting element 30 to emit light.

[0052] In this invention, the orthogonal projection of the metal part 20 onto the substrate 10 covers the orthogonal projection of the first electrode 31 onto the substrate 10.

[0053] like Figure 4 The schematic top view shows the first electrode 31 of the light-emitting element 30, the metal part 20, and the connecting electrode 40. The shapes of the first electrode 31 and the metal part 20 are only schematically shown in the figure. The connecting electrode 40 is electrically connected to the first electrode 31 and is connected to the pixel circuit through a via K. Optionally, the connecting electrode 40 and the first electrode 31 are made of the same layer and material, forming an integral structure. It should be noted that the projection direction of the first electrode 31 and the metal part 20 onto the substrate 10 is the same as the top view direction of the display panel. Therefore, in the top view, the first electrode 31 and its projection onto the substrate 10 coincide, and the metal part 20 and its projection onto the substrate 10 also coincide. Figure 4 As can be seen from the diagram, the orthographic projection of the metal portion 20 onto the substrate 10 overlaps with the orthographic projection of the first electrode 31 onto the substrate 10. In other words, the orthographic projection of the first electrode 31 onto the substrate lies within the orthographic projection of the metal portion 20 onto the substrate. Since the fabrication process of the first electrode 31 follows that of the metal portion 20, when the first electrode 31 is fabricated at a position directly above the metal portion 20, the metal portion 20 can provide a relatively flat substrate for the first electrode 31.

[0054] Specifically, the display panel further comprises a packaging structure, the packaging structure is located on a side of the light emitting element away from the substrate, and the packaging structure covers and surrounds the plurality of light emitting elements. The packaging structure is used to isolate water and oxygen to protect the light emitting layer of the light emitting element and ensure the service life of the light emitting element.

[0055] In an embodiment, the packaging structure is a thin film packaging structure, and the packaging structure comprises at least one inorganic packaging layer and at least one organic packaging layer which are stacked. This embodiment can be used to manufacture a display panel with a certain flexibility.

[0056] In another embodiment, the packaging structure is a rigid packaging structure, and the packaging structure comprises packaging glass. The packaging glass is bonded to the array layer of the display panel by a sealant, so as to accommodate the plurality of light emitting elements in a cavity formed by the packaging glass and the sealant. The array layer is manufactured on the substrate, and the array layer comprises pixel circuits.

[0057] In the display panel provided by the embodiment of the present application, the metal part 20 is located directly below the light emitting element 30, and the orthographic projection of the metal part 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on the substrate 10. During the manufacturing of the display panel, the first electrode 31 is manufactured directly above the region corresponding to the metal part 20. The metal part 20 can provide a relatively flat substrate for the manufacturing of the first electrode 31, so that the manufactured first electrode 31 is relatively flat, that is, the first electrode 31 has a relatively flat surface in the display panel provided by the embodiment of the present application. Therefore, the probability of interference between the ambient light reflected by the first electrode 31 is reduced, so that the color dispersion phenomenon of the display panel in the dark state can be improved, and the appearance quality is improved. At the same time, the relatively flat first electrode 31 can also reduce the color difference of the color of the pixel light emitting area at different viewing angles, improve the color deviation problem of the display panel with a large viewing angle, and improve the display effect.

[0058] This invention also includes a pixel circuit, fabricated on the substrate 10 and located below the light-emitting element 30. The pixel circuit includes multiple thin-film transistors. In one embodiment, the active layer of the thin-film transistor in the pixel circuit includes silicon, and the thin-film transistor is a low-temperature polysilicon transistor. In another embodiment, the active layer of the driving transistor in the pixel circuit includes silicon, and the active layer of some of the switching transistors in the pixel circuit includes metal oxide. In application, light emitted from the light-emitting element 30 may be reflected and refracted before reaching the underlying thin-film transistor. Additionally, ambient light may penetrate part of the film structure of the display panel from the area between adjacent light-emitting elements 30 and reach the underlying thin-film transistor. Since the active layer of the thin-film transistor is photosensitive, it will generate photo-induced leakage current after receiving light, causing changes in the characteristics of the thin-film transistor device, which in turn affects the pixel circuit's ability to drive the light-emitting element to emit light, resulting in uneven display on the display panel. Therefore, this invention further designs the structure of the display panel to prevent light from affecting the transistor devices in the pixel circuit.

[0059] In some embodiments, a color filter layer is disposed above the light-emitting elements. The color filter layer includes multiple filter units and light-shielding portions. The light-shielding portions can block the area between adjacent light-emitting elements, preventing ambient light from shining from this area onto the pixel circuitry below. Simultaneously, the design of the color filter layer can also reduce the reflection of ambient light by the display panel. Specifically, Figure 5 This is a partial top view of the color filter layer in another display panel provided by an embodiment of the present invention, as shown below. Figure 5 As shown, the color filter layer 50 includes a plurality of filter units 51 and a light-shielding portion 52. The light-shielding portion 52 defines a plurality of first openings 53. The projection of the filter unit 51 onto the plane where the light-shielding portion 52 is located covers the first openings 53. Figure 5 The shape of the first opening 53 is only schematically shown. In the display panel, one sub-pixel corresponds to one first opening 53. The first opening 53 overlaps with the light-emitting element, and the shape of the first opening 53 is the same as the shape of the light-emitting layer 32 in the light-emitting element 30. Specifically, the filter unit 51 includes a red filter unit, a green filter unit, and a blue filter unit. Specifically, red sub-pixels correspond to red filter units, green sub-pixels correspond to green filter units, and blue sub-pixels correspond to blue filter units.

[0060] In one embodiment, Figure 6 for Figure 2 Another cross-sectional view at the position of the tangent line A-A'. (See diagram below.) Figure 6As shown, the color filter layer 50 is located on the side of the light emitting element 30 away from the substrate 10; along the light emitting direction e of the display panel, the first opening 53 overlaps the light emitting element 30, and the projection of the metal portion 20 on the color filter layer 50 covers the first opening 53. The figure also shows a pixel definition layer 60, which is used to separate adjacent light emitting elements 30. The pixel definition layer 60 includes a second opening 61, one light emitting element 30 corresponds to one second opening 61, the second opening 61 exposes the first electrode 31, and the light emitting layer 32 is located in the second opening 61. The figure also shows a transistor T in the pixel circuit, and the first electrode 31 is electrically connected to the transistor T through the connecting electrode 40. The transistor T includes a gate, a source, a drain, and an active layer, wherein the first electrode 31 is electrically connected to the drain of the transistor T through a via hole of the insulating layer.

[0061] In this embodiment, the metal portion 20 is arranged to cover the projection of the first electrode 31 on the substrate 10, and during the manufacturing of the display panel, the metal portion 20 can provide a relatively flat substrate for the manufacturing of the first electrode 31, so that the manufactured first electrode 31 is relatively flat, thereby reducing the interference between the ambient light reflected by the first electrode 31, improving the color dispersion phenomenon of the display panel in the dark state, and improving the appearance quality; at the same time, it can also reduce the color difference of the pixel light emitting area color under different viewing angles, and improve the large viewing angle color deviation problem of the display panel. The color filter layer is arranged on the side of the light emitting element 30 away from the substrate 10, and the filter unit 51 in the color filter layer 50 can transmit visible light of a specific wavelength range, such as a red filter unit that can transmit red light, a green filter unit that can transmit green light, and a blue filter unit that can transmit blue light, that is, the filter unit 51 can prevent the transmission of light of other wavelength ranges except the specific wavelength range, thereby reducing the amount of light entering the display panel from the ambient light, reducing the reflection of the first electrode 31 to the ambient light, and reducing the reflection of the display panel to the ambient light. Moreover, when the light penetrating a color filter unit 51 is reflected by the first electrode 31 of the light emitting element 30 overlapping the filter unit 51 and then shoots towards another color filter unit, it cannot penetrate the other color filter unit 51 and exit the display panel, thereby reducing the reflection of the display panel to the ambient light, and the color filter layer 50 arranged above the light emitting element 30 can reduce the reflection of the display panel to the ambient light.

[0062] Specifically, Figure 6 In the embodiment, the pixel definition layer 60 is made of a light-transmitting organic material, that is, the material for manufacturing the pixel definition layer 60 includes a light-transmitting material, so that the area between adjacent light emitting elements 30 has a certain light transmittance, and the light shielding portion 52 in the color filter layer 50 overlaps the pixel definition layer 60 in the light emitting direction e of the display panel, and the filter portion 52 can shield the light to prevent the light from penetrating the pixel definition layer 60 and shooting towards the transistor device below. Moreover Figure 6In this embodiment, the projection of the metal part 20 onto the color filter layer 50 covers the first opening 53. Light emitted from the first opening 53 toward the pixel circuit below (as shown by the dashed arrow in the figure) can be blocked by the metal part 20. The metal part 20 can prevent light from shining onto the transistor devices below, thereby reducing the risk of uneven display on the display panel.

[0063] Furthermore, the metal part 20 is made of a light-absorbing material, so that the metal part 20 can absorb the light incident on it, and the amount of light reflected by the metal part 20 is reduced, that is, the reflection of light by the metal part 20 can be reduced, which can further reduce the reflection of light by the display panel and improve the display effect of the display panel.

[0064] In the display panel, the first electrode 31 of the light-emitting element 30 is a reflective electrode, and the reflectivity of the first electrode 31 to light is greater than that of the metal part 20. Specifically, in the light-emitting direction e of the display panel, the first opening 53 overlaps with the light-emitting element 30. While ensuring that the light emitted by the light-emitting element 30 can exit through the first opening 53 and has a certain range of emission angle, the projection of the first electrode 31 onto the color filter layer 50 is positioned within the first opening 53 along the light-emitting direction e of the display panel. In other words, the area of ​​the first electrode 31 is smaller than the area of ​​the first opening 53. The metal part 20 below the first electrode 31 can block the light penetrating the first opening 53, and the area of ​​the first electrode 31 does not need to be too large. This avoids increasing the reflection of ambient light by the display panel due to the high reflectivity of the first electrode 31.

[0065] In another embodiment, Figure 7 for Figure 2 Another cross-sectional diagram at the position of the midtangent line A-A'. (See diagram below.) Figure 7 As shown, the display panel also includes a color filter layer 50 located on the side of the light-emitting element 30 away from the substrate 10. The color filter layer 50 includes a plurality of light-filtering units 51 (only one is shown in the figure) and a light-shielding portion 52. The light-shielding portion 52 defines a plurality of first openings 53 (only one is shown in the figure). The projection of the light-filtering unit 51 onto the plane of the light-shielding portion 52 covers the first opening 53. Along the light-emitting direction e of the display panel, the first opening 53 overlaps with the light-emitting element 30, and the orthographic projection of the first electrode 31 onto the color filter layer 50 covers the first opening 53. A pixel definition layer 60 is also shown in the figure. The pixel definition layer 60 is used to space adjacent light-emitting elements 30. The pixel definition layer 60 includes a second opening 61, with one second opening 61 corresponding to one light-emitting element 30. The second opening 61 exposes the first electrode 31, and the light-emitting layer 32 is located within the second opening 61. The pixel definition layer 60 is made of a light-transmitting material.

[0066] In this embodiment, the metal portion 20 covers the projection of the first electrode 31 on the substrate 10, and thus can provide a relatively flat substrate for the first electrode 31 during the manufacturing of the display panel, so as to manufacture a relatively flat first electrode 31, which has a relatively flat surface, so that the probability of interference between the ambient light reflected by the first electrode 31 is reduced, the color dispersion phenomenon of the display panel in the dark state is improved, and the appearance quality is improved. At the same time, the color difference of the color of the pixel light-emitting area under different viewing angles is reduced, and the large-viewing-angle color deviation problem of the display panel is improved. At the same time, the color film layer 50 above the light-emitting element 30 can reduce the reflection of ambient light by the display panel, and the light-shielding portion 52 in the color film layer 50 can shield the area between the adjacent light-emitting elements 30, so as to prevent the light from penetrating the pixel definition layer 60 and being incident on the transistor device below. Further, the first electrode 31 covers the first opening 53 in the projection of the color film layer 50, so that the light (such as the dashed arrow shown in the figure) incident on the pixel circuit below from the first opening 53 can be shielded by the first electrode 31, and the first electrode 31 can further prevent the light from being incident on the transistor device below, so as to reduce the risk of display unevenness of the display panel.

[0067] In some embodiments, the material for manufacturing the pixel definition layer in the display panel includes a light-shielding material, so that the pixel definition layer between the adjacent light-emitting elements can have a certain shielding effect on the light, so as to prevent the light from penetrating the pixel definition layer and being incident on the pixel circuit below, so as to reduce the risk of display unevenness of the display panel. At the same time, the pixel definition layer can also prevent the light between the adjacent light-emitting elements from crosstalk. In addition, in order to ensure that the user has a good use experience, the display panel needs to have a large viewing angle, and thus the light-emitting angle of the light-emitting element needs to meet a certain range, and thus the sidewall of the second opening of the pixel definition layer has a non-right angle with the plane of the substrate. That is, in the direction from the center of the second opening to the edge, the distance between the sidewall of the second opening and the substrate gradually changes. Thus, the sidewall of the second opening still has a certain light transmittance, and the light can penetrate the sidewall of the second opening and be incident on the pixel circuit below. Based on this, the structure of the display panel is further improved to solve the above problems.

[0068] Specifically, in one embodiment, Figure 8 For Figure 2 Another cross-sectional view at the position of the tangent line A-A'. As shown in the figure, Figure 8As shown, the pixel definition layer 60 comprises a plurality of second openings 61, the second openings 61 expose the first electrode 31, and the light emitting layer 32 is located within the second openings 61; wherein the material of the pixel definition layer 61 comprises a light shielding material. As shown in the figure, the sidewall M of the second opening 61 has a non-right angle included angle a with the plane where the substrate 10 is located; that is, the sidewall M of the second opening 61 is a slope sidewall. The orthographic projection of the first electrode 31 on the substrate 10 covers the orthographic projection of the sidewall M on the substrate 10. A pixel circuit for driving the light emitting element 30 to emit light is also provided on the substrate 10, which is not shown in the figure.

[0069] In this embodiment, the orthographic projection of the metal part 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on the substrate 10. During the manufacturing of the display panel, the metal part 20 can provide a relatively flat substrate for the manufacturing of the first electrode 31, so that the manufactured first electrode 31 is relatively flat, thereby reducing the probability of interference between the ambient light reflected by the first electrode 31, and improving the color dispersion problem of the display panel in the dark state. At the same time, the relatively flat first electrode 31 can also reduce the color difference of the color of the pixel light emitting area at different viewing angles, and improve the color deviation problem of the display panel with large viewing angle. In addition, the first electrode 31 can shield the light (as shown by the dashed arrow in the figure) penetrating through the sidewall M of the second opening 61, so as to prevent the light from being emitted by the sidewall M of the second opening 61 to the transistor device below, thereby reducing the risk of display unevenness of the display panel.

[0070] Specifically, in another embodiment, Figure 9 For Figure 2 Another cross-sectional view at the position of the tangent line A-A'. As shown in the figure, Figure 9 The sidewall M of the second opening 61 of the pixel definition layer 60 has a non-right angle included angle a with the plane where the substrate 10 is located; and the orthographic projection of the metal part 20 on the substrate 10 covers the orthographic projection of the sidewall M on the substrate 10. In this embodiment, the orthographic projection of the metal part 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on the substrate 10, so that the manufactured first electrode 31 is relatively flat, thereby reducing the probability of interference between the ambient light reflected by the first electrode 31, and improving the color dispersion problem of the display panel in the dark state; at the same time, the relatively flat first electrode 31 can also reduce the color difference of the color of the pixel light emitting area at different viewing angles, and improve the color deviation problem of the display panel with large viewing angle. In addition, the metal part 20 can shield the light (as shown by the dashed arrow in the figure) penetrating through the sidewall M of the second opening 61, so as to prevent the light from being emitted by the sidewall M of the second opening 61 to the transistor device below, thereby reducing the risk of display unevenness of the display panel.

[0071] In addition, Figure 8 And Figure 9The display panel in the embodiments can also include an anti-reflection layer on the side of the light emitting element away from the substrate, which is used to reduce the reflection of ambient light by the display panel, so as to improve the display effect of the display panel.

[0072] Specifically, the anti-reflection layer includes Figure 5 The color filter layer 50 in the embodiments is shown.

[0073] In one embodiment, the metal part 20 is not connected to an electrical potential. That is, no voltage signal is transmitted on the metal part 20 when the display panel is in operation. Alternatively, the metal part 20 is made of the same material as the functional structures in the display panel, but the metal part 20 is not reused as a circuit element (such as a trace or an electrode) in the pixel circuit. The provision of the metal part 20 can provide a relatively flat substrate for the fabrication of the light emitting element 30, so that the first electrode 31 is relatively flat, which can improve the color dispersion of the display panel in a dark state and improve the color deviation of the display panel in a large viewing angle. Moreover, the provision of the metal part 20 does not change the design of the circuit elements in the pixel circuit, so as to prevent the large-area metal part 20 from affecting the electrical performance of the circuit elements and increasing the complexity of the design of the pixel circuit.

[0074] In one embodiment, the metal part 20 is reused as a signal line in the display panel. That is, a voltage signal is transmitted on the metal part 20 when the display panel is in operation. In this embodiment, the shape of the signal line directly below the light emitting element 30 is changed to serve as the metal part 20. The design of the metal part 20 does not increase additional structures in the display panel and has less impact on the wiring of the pixel circuit.

[0075] Specifically, the shape of the metal part 20 is the same as that of the first electrode 31. Figure 10 The shapes of the metal part and the first electrode in the embodiments of the present application are shown. Figure 1 , Figure 11 The shapes of the metal part and the first electrode in the embodiments of the present application are shown. Figure 2 . Figure 10 and Figure 11 are top views of the display panel, which show that the first electrode 31 overlaps the metal part 20. Taking the example of reusing the metal part 20 as a signal line in the display panel, that is, the metal part 20 is part of the signal line.

[0076] As shown in Figure 10 , the shapes of the first electrode 31 and the metal part 20 are both rectangular. As shown in Figure 11As shown, the shapes of the first electrode 31 and the metal part 20 are both circular. By setting the shape of the metal part 20 to be the same as the shape of the first electrode 31, the metal part 20 below the first electrode 31 does not need to be made too large in area, and the setting of the metal part 20 can avoid affecting other structures in the display panel. For example, the first electrode 31 and the pixel circuit below need to be connected through a via, and first, the first electrode 31 is connected to a connecting electrode (which can be referred to as the connecting electrode in the schematic description in Figure 4 and Figure 6 ). Then the connecting electrode is connected to the drain of the transistor through a via in the insulating layer. By setting the shape of the metal part 20 to be the same as the shape of the first electrode 31, the metal part 20 does not need to be made too large in area, and the metal part 20 occupies less space, which can reduce the influence on the via through which the connecting electrode is connected to the transistor.

[0077] The shape of the first electrode 31 in the embodiment of the application can also be a regular polygon or other shapes, and in practice, the shape of the first electrode 31 can be designed according to specific needs.

[0078] In one embodiment, Figure 12 Another cross-sectional schematic diagram of a display panel provided by the embodiment of the application is shown in Figure 12 , which shows that the display panel further includes a first metal layer M1 and a second metal layer M2 above the substrate 10, wherein the thickness of the second metal layer M2 is greater than the thickness of the first metal layer M1; and the metal part 20 is located in the second metal layer M2. The thicker the thickness of the metal layer, the greater the influence of the structure made of the metal layer on the flatness of the first electrode 31 made subsequently. In this embodiment, the metal part 20 is located in the metal layer with a greater thickness, and the metal part 20 is made to be a large area, so that the orthographic projection of the metal part 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on the substrate 10, and the metal part 20 can provide a relatively flat substrate for the manufacture of the first electrode 31. In the embodiment of the application, the first electrode 31 has good flatness, which can improve the color dispersion phenomenon of the display panel in the dark state and improve the appearance quality of the product; and can also improve the color deviation problem of the display panel in a large viewing angle.

[0079] Specifically, as shown in Figure 12 , the transistor T in the pixel circuit includes a gate g1, a source g2 and a drain g3, and the first electrode 31 of the light emitting element 30 is connected to the drain g3. The metal part 20 is located in the same layer as the source g2 and the drain g3, that is, the source g2 and the drain g3 are located in the second metal layer M2. Optionally, the manufacturing material of the second metal layer includes titanium / aluminum / titanium. The manufacturing material of the first metal layer includes molybdenum.

[0080] In some embodiments, the display panel comprises at least two metal layers between the substrate 10 and the light emitting element 30, wherein the metal portion 20 is located in the metal layer closest to the light emitting element 30 in the light emitting direction of the display panel. In this embodiment, the metal portion 20 is located in the metal layer closest to the light emitting element 30 above the substrate 10, i.e. after the process of the metal portion 20, there is no other metal layer process before the first electrode of the light emitting element 30 is made. There is no other metal structure above the metal portion 20 to affect the flatness of the substrate under the first electrode 31. After the insulating layer is made above the metal portion 20, a relatively flat substrate can be provided for the making of the first electrode 31, so that the flatness of the made first electrode 31 is better, i.e. the first electrode 31 has better flatness in the embodiment of the present application. The probability of interference between the ambient light reflected by the first electrode 31 is reduced, which can improve the color dispersion problem of the display panel in dark state. Meanwhile, the relatively flat first electrode 31 can also reduce the color difference of the color of the pixel light emitting area at different viewing angles, improve the color deviation problem of the display panel at large viewing angle, and improve the display effect.

[0081] Specifically, the display panel further comprises an organic insulating layer. As shown in the above Figure 12 The organic insulating layer 71 is in contact with and covers the metal portion 30. The organic insulating layer 71 is a planarization layer. In this embodiment, the metal portion 20, the source electrode g2 and the drain electrode g3 are located in the same layer, i.e. the metal portion 20, the source electrode g2 and the drain electrode g3 are made in the same process. The organic insulating layer 71 is made after the process of the source electrode and the drain electrode, so that the organic insulating layer 71 is in contact with and covers the metal portion 30, and the organic insulating layer 71 is etched to form a via (not shown in the figure) exposing the drain electrode g2. When the first electrode 31 is made, the first electrode 31 is made directly above the metal portion 20, and the surface of the organic insulating layer 71 made on the large-area metal portion 20 is relatively flat, so that a relatively flat substrate can be provided for the first electrode 31, so that the flatness of the made first electrode 31 is higher, i.e. the first electrode 31 has better flatness in the embodiment of the present application. The probability of interference between the ambient light reflected by the first electrode 31 is reduced, which can improve the color dispersion problem of the display panel in dark state. Meanwhile, the relatively flat first electrode 31 can also reduce the color difference of the color of the pixel light emitting area at different viewing angles, improve the color deviation problem of the display panel at large viewing angle, and improve the display effect. In addition, the connecting electrode 40 is made in the same process when the first electrode 31 is made, the connecting electrode 40 is connected with the first electrode 31, and the connecting electrode 40 is connected with the drain electrode g3 below through the via, so as to realize the electrical connection between the first electrode 31 and the transistor in the pixel circuit.

[0082] In another embodiment, Figure 13A cross-sectional schematic diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 13 As shown, the organic insulating layer 71 contacts and covers the metal portion 30. In this embodiment, an insulating layer (not shown) is provided between the metal portion 30 and the source and drain of the transistor T, that is, the metal portion 30 and the source and drain are located in different metal layers. During the manufacturing of the display panel, an insulating layer is fabricated over the entire surface after the processes for the source g2 and drain g3, and then the insulating layer is etched to form vias exposing the drain g3; then the metal portion 30 is fabricated on the insulating layer; then the entire surface of the organic insulating layer 71 is fabricated on the metal portion 30, wherein the organic insulating layer 71 has both insulating and planarizing functions; then the organic insulating layer 71 is etched to form vias exposing the drain g3, that is, the vias of the insulating layer on the drain g3 and the vias of the organic insulating layer 71 are interconnected to expose the drain g3. Then, a first electrode 31 is fabricated on the organic insulating layer 71. The first electrode 31 is fabricated directly above the metal part 20. The surface of the organic insulating layer 71 fabricated on the large area of ​​the metal part 20 is also relatively flat, thereby providing a relatively flat substrate for the first electrode 31. This results in a high degree of flatness in the fabricated first electrode 31, which can improve the color dispersion problem of the display panel in the dark and also improve the color shift problem of the display panel at large viewing angles. Similarly, during the fabrication of the first electrode 31, a connecting electrode 40 is formed in the same process. The connecting electrode 40 is connected to the first electrode 31 and is connected to the drain electrode g3 below through a via.

[0083] Figure 13 In this embodiment, the metal portion 20 is fabricated in a metal layer above the source and drain electrodes, and the metal layer containing the metal portion 20 is the metal layer closest to the light-emitting element 30. In one embodiment, the metal portion 20 is not connected to a potential when the display panel is operating.

[0084] In another embodiment, the metal part 20 is reused as a signal line in the display panel. For example, the metal part 20 is electrically connected to the positive power signal line in the display panel. The positive power signal line is used to provide a constant positive voltage signal to the pixel circuit when the pixel circuit is working. By setting the metal part 20 to be electrically connected to the positive power signal line, the overall resistance of the positive power signal line can be reduced, thereby reducing the voltage drop loss on the positive power signal line and reducing the power consumption of the display panel.

[0085] In another embodiment, Figure 14 A cross-sectional schematic diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 14As shown, the display panel includes an inorganic insulating layer 72 and an organic insulating layer 71, the inorganic insulating layer 72 is in contact with and covers the metal part 20, and the organic insulating layer 71 is in contact with and covers the inorganic insulating layer 72. That is, the inorganic insulating layer 72 and the organic insulating layer 71 are disposed on the metal part 20. One transistor T in the pixel circuit is also shown in the figure, and the transistor T includes a gate g1, a source g2, and a drain g3. The first electrode 31 of the light emitting element 30 is electrically connected to the drain g3 of the transistor T through the connecting electrode 40. The metal structure 80 is also shown in the figure, and the metal structure 80 is located on the side of the inorganic insulating layer 70 away from the substrate 10, that is, the metal structure 80 is made after the process of the inorganic insulating layer 70. In the light emission direction e of the display panel, the metal structure 80 does not overlap the first electrode 31.

[0086] Figure 14 As shown, the display panel includes an inorganic insulating layer 72 and an organic insulating layer 71, the inorganic insulating layer 72 is in contact with and covers the metal part 20, and the organic insulating layer 71 is in contact with and covers the inorganic insulating layer 72. That is, the inorganic insulating layer 72 and the organic insulating layer 71 are disposed on the metal part 20. One transistor T in the pixel circuit is also shown in the figure, and the transistor T includes a gate g1, a source g2, and a drain g3. The first electrode 31 of the light emitting element 30 is electrically connected to the drain g3 of the transistor T through the connecting electrode 40. The metal structure 80 is also shown in the figure, and the metal structure 80 is located on the side of the inorganic insulating layer 70 away from the substrate 10, that is, the metal structure 80 is made after the process of the inorganic insulating layer 70. In the light emission direction e of the display panel, the metal structure 80 does not overlap the first electrode 31.

[0087] In an embodiment, Figure 14The metal structure 80 in the embodiment can be a signal line in the display panel. For example, the metal structure 80 can be electrically connected with a signal line in a different metal layer to form a double-layer metal trace, thereby reducing the overall resistance of the signal line, reducing the voltage drop loss when transmitting a voltage signal on the signal line during the operation of the display panel, and reducing the power consumption of the display panel.

[0088] The embodiment of the present application also provides a display device, Figure 15 A display device provided by the embodiment of the present application is shown in the figure. The display device includes the display panel 100 provided by any of the embodiments of the present application. The structure of the display panel 100 has been described in the above display panel embodiments, and will not be repeated here. The display device in the embodiment of the present application can be any device with display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper, a television, a smart wearable product, etc.

[0089] The above merely describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

[0090] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate; a metal portion on one side of the substrate; a light emitting element on the side of the metal portion away from the substrate, the light emitting element comprising a first electrode, a light emitting layer and a second electrode; a color filter layer on the side of the light emitting element away from the substrate, the color filter layer comprising a plurality of filter units and a light shielding portion, the light shielding portion defining a plurality of first openings, the first openings overlapping the light emitting element; a pixel definition layer on the side of the metal portion away from the substrate, the pixel definition layer comprising a second opening, the second opening exposing the first electrode, the light emitting layer being in the second opening; the area of the first electrode being smaller than the area of the first opening; wherein, in the direction from the first electrode to the second electrode, the projection of the metal portion on the color filter layer covers the first opening; and / or the display panel comprises a first metal layer and a second metal layer on the substrate, the thickness of the second metal layer being greater than the thickness of the first metal layer; the metal portion is on the second metal layer.

2. The display panel of claim 1, wherein: the projection of the filter unit on the plane of the light shielding portion covers the first opening.

3. The display panel of claim 1, wherein: in the direction from the first electrode to the second electrode, the projection of the first electrode on the color filter layer is in the first opening.

4. The display panel of claim 1, wherein: the side wall of the second opening and the plane of the substrate form a non-straight included angle, the orthographic projection of the metal portion on the substrate covers the orthographic projection of the side wall on the substrate.

5. The display panel of claim 1, wherein: the side wall of the second opening has a non-straight included angle on the plane of the substrate, the orthographic projection of the first electrode on the substrate covers the orthographic projection of the side wall on the substrate.

6. The display panel of claim 1, wherein: the orthographic projection of the metal portion on the substrate covers the orthographic projection of the first electrode on the substrate.

7. The display panel of claim 1, wherein: the display panel comprises at least two metal layers between the substrate and the light emitting element; wherein: in the direction from the first electrode to the second electrode, the metal portion is on the metal layer closest to the light emitting element.

8. The display panel of claim 1, wherein: the display panel comprises an organic insulating layer, the organic insulating layer being in contact with and covering the metal portion.

9. The display panel of claim 1, wherein: the display panel comprises an inorganic insulating layer and an organic insulating layer, the inorganic insulating layer being in contact with and covering the metal portion, the organic insulating layer being in contact with and covering the inorganic insulating layer.

10. The display panel of claim 1, wherein: the metal portion is multiplexed as a signal line in the display panel; or the metal portion does not receive a potential. ​ 11. The display panel of claim 1, wherein the pixel definition layer comprises a light-blocking material or a light-transmitting material; and / or the metal portion comprises a light-absorbing material.

12. The display panel of claim 1, wherein the metal portion has the same shape as the first electrode.

13. A display device comprising: a display panel as claimed in any one of claims 1-12.

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