Display panel and display device

Abstract

The embodiment of the present invention provides a display panel and a display device. The display panel includes a substrate; a metal portion located on the substrate; a plurality of light-emitting elements located on a side of the metal portion away from the substrate, the light-emitting elements including a first electrode, a light-emitting layer, and a second electrode stacked in sequence along the light-emitting direction of the display panel; wherein the orthographic projection of the metal portion on the substrate covers the orthographic projection of the light-emitting layer and the first electrode on the substrate. In the embodiment of the present invention, the first electrode has a relatively flat surface, so the probability of mutual interference between the ambient light reflected by the first electrode is reduced, which can improve the dispersion phenomenon of the display panel in the dark state and enhance the appearance quality; at the same time, the relatively flat first electrode can also reduce the color difference of the pixel light-emitting area at different viewing angles, improve the color deviation problem of the display panel at large viewing angles, and enhance the display effect.

Description

[0001] This application is a divisional application with the application date of January 29, 2021, application number 202110130088.9, and the name of the invention is "A display panel and display device". Technical Field

[0002] The present invention relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0003] Organic light-emitting diodes (OLEDs) are used as light-emitting elements in organic light-emitting displays (OLEDs). These self-luminous diodes eliminate the need for additional light sources, contributing to thinner and lighter displays and enabling the production of flexible displays. OLED technology also boasts fast response times and wide viewing angles, making it a current research focus.

[0004] Current organic light-emitting display panels exhibit significant color dispersion under ambient light, affecting product appearance and quality. Summary of the Invention

[0005] Embodiments of the present invention provide a display panel and a display device to solve the problem of color dispersion of a display panel under ambient light in the prior art and improve the external light quality of a product.

[0006] An embodiment of the present invention provides a display panel, comprising: a substrate;

[0007] a metal portion located on the substrate;

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

[0009] The orthographic projection of the metal portion on the substrate covers the orthographic projection of the first electrode on the substrate.

[0010] In some embodiments, the display panel further includes a color filter layer located on a side of the light-emitting element away from the substrate; the color filter layer includes a plurality of filter units and a shading portion, the shading portion defines a plurality of first openings, and the projection of the filter unit on the plane where the shading portion 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 portion on the color filter layer covers the first opening.

[0011] Furthermore, the material of the metal part includes a light absorbing material.

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

[0013] In some embodiments, the display panel further includes a color filter layer located on a side of the light-emitting element away from the substrate; the color filter layer includes a plurality of filter units and a shading portion, the shading portion defines a plurality of first openings, and the projection of the filter unit on the plane where the shading portion 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 positive projection of the first electrode on the color filter layer covers the first opening.

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

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

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

[0017] In one embodiment, the sidewall of the second opening has a non-right angle with the plane where the substrate is located; and the orthographic projection of the metal portion on the substrate covers the orthographic projection of the sidewall on the substrate.

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

[0019] In one embodiment, the display panel includes a first metal layer and a second metal layer located on a substrate, wherein the thickness of the second metal layer is greater than that of the first metal layer; wherein the metal portion is located in the second metal layer.

[0020] In one embodiment, the display panel includes 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 the light emitting direction of the display panel.

[0021] In one embodiment, the display panel further includes an organic insulating layer, wherein the organic insulating layer contacts the metal portion and covers the metal portion.

[0022] In one embodiment, the display panel includes an inorganic insulating layer and an organic insulating layer, the inorganic insulating layer contacts and covers the metal portion, and the organic insulating layer contacts and covers the inorganic insulating layer.

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

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

[0025] An embodiment of the present invention provides a display device, including the display panel provided by any embodiment of the present invention.

[0026] The display panel and display device provided by the embodiments of the present invention have the following beneficial effects:

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

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

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

[0030] Figure 2 A schematic diagram of a display panel provided by an embodiment of the present invention;

[0031] Figure 3 for Figure 2 A schematic diagram of a cross section at the mid-tangent line A-A';

[0032] Figure 4 for Figure 2 A top view of the middle area at position Q;

[0033] Figure 5 A partial top view schematic diagram of a color filter layer in another display panel provided by an embodiment of the present invention;

[0034] Figure 6 for Figure 2 Another cross-sectional view at the midline A-A';

[0035] Figure 7 for Figure 2Another cross-sectional view at the midline A-A';

[0036] Figure 8 for Figure 2 Another cross-sectional view at the midline A-A';

[0037] Figure 9 for Figure 2 Another cross-sectional view at the midline A-A';

[0038] Figure 10 Schematic diagram of the shape of the metal portion and the first electrode in the embodiment of the present invention Figure 1 ;

[0039] Figure 11 Schematic diagram of the shape of the metal portion and the first electrode in the embodiment of the present invention Figure 2 ;

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

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

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

[0043] Figure 15 A schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

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

[0046] Figure 1 FIG. 1 is a simplified cross-sectional diagram of a display panel in the related art. Figure 1As shown, a signal trace 2 is provided directly below the light-emitting element 1. Since the signal trace 2 has a certain width and thickness, the insulating layer 3 formed on the signal trace 2 cannot form a flat surface, resulting in the anode 4 of the light-emitting element 1 formed directly above the position corresponding to the signal trace 2 being uneven, and the anode 4 having an uneven surface. The uneven surface of the anode 4 also causes the light-emitting layer 5 and the cathode 6 formed thereon to be uneven. The anode 4 in the light-emitting element 1 is usually a reflective anode, and the anode 4 has a high reflectivity to light. Ambient light may penetrate part of the film layer of the display panel or be reflected by the anode 4, and the light reflected at different positions of the uneven anode 4 may 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 uneven anode 4 reflecting the ambient light will be very obvious, seriously affecting the appearance quality of the product. In addition, the unevenness of the anode 4 will also cause the color of the display panel to change significantly at different viewing angles. As shown in the figure, the color of the pixel emitting area at the viewing angle S1 is different from that at the viewing angle S2. That is, the unevenness of the anode 4 causes a large viewing angle color shift problem in the display panel, affecting the display effect.

[0047] To address the challenges of related technologies, the present invention provides a display panel with a large metal portion designed below the light-emitting element. This allows the first electrode of the light-emitting element, located on the side closest to the metal portion, to be fabricated on a relatively flat surface. This improves the color dispersion caused by ambient light reflected from the display panel, enhancing the product's appearance. Furthermore, it addresses the color shift problem of the display panel with large viewing angles, improving the display quality.

[0048] Figure 2 A schematic diagram of a display panel provided by an embodiment of the present invention is shown. Figure 3 for Figure 2 A schematic diagram of a cross section at the mid-tangent line A-A'. Figure 4 for Figure 2 Schematic diagram of the top view at position Q in the middle area.

[0049] like Figure 2 As shown, 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. The display area AA includes multiple sub-pixels sp, each of which includes a light-emitting element 30. The multiple sub-pixels sp include red sub-pixels, green sub-pixels, and blue sub-pixels. The shape of the display panel in the figure is for schematic representation only and does not limit the present invention.

[0050] like Figure 3 Only part of the structure of the display panel is simplified. Figure 3 As shown, the display panel includes: a substrate 10, a metal portion 20 and a plurality of light emitting elements 30 ( Figure 3Only one is shown in the figure). The metal part 20 is located on the substrate 10, and the light-emitting element 30 is located on the side of the metal part 20 away from the substrate 10, that is, when the display panel is viewed from a normal angle, the metal part 20 is located 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 in sequence along the light-emitting direction e of the display panel. During the display panel manufacturing process, the metal part 20 is manufactured on the substrate 10, and the light-emitting element 30 is manufactured after the manufacturing process of the metal part 20, that is, the first electrode 31, the light-emitting layer 32, and the second electrode 33 are manufactured in sequence on the metal part 20. Specifically, the first electrode 31 is a reflective electrode, and the second electrode 33 is a transparent electrode. The light-emitting direction of the light-emitting element 30 is the direction from the first electrode 31 to the second electrode 33. Part of the light emitted by the light-emitting layer 32 is directly emitted toward the second electrode 33, and part of the light emitted by the light-emitting layer 32 toward the first electrode 31 can be reflected by the first electrode 31 and then penetrate the second electrode 33 for emission, thereby ensuring the light extraction 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 further includes a pixel circuit ( Figure 3 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 the present invention, the orthographic projection of the metal portion 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on 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. In the figure, the shapes of the first electrode 31 and the metal part 20 are only schematically shown. Among them, the connecting electrode 40 is electrically connected to the first electrode 31, and the connecting electrode 40 is connected to the pixel circuit through the via K. Optionally, the connecting electrode 40 and the first electrode 31 are made of the same layer and the same material, and the connecting electrode 40 and the first electrode 31 are an integrated 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. Then, in the top view, the first electrode 31 coincides with its orthographic projection on the substrate 10, and the metal part 20 coincides with its orthographic projection on the substrate 10. Figure 4 As can be seen from the diagram in the figure, the orthographic projection of the metal portion 20 on the substrate 10 overlaps the orthographic projection of the first electrode 31 on the substrate 10. In other words, the orthographic projection of the first electrode 31 on the substrate is located within the orthographic projection of the metal portion 20 on the substrate. The fabrication process of the first electrode 31 is after the fabrication process of the metal portion 20. When the first electrode 31 is fabricated at a position corresponding to the position directly above the metal portion 20, the metal portion 20 can provide a relatively flat base for the first electrode 31.

[0054] Specifically, the display panel also includes an encapsulation structure, which is located on a side of the light-emitting elements away from the substrate. The encapsulation structure covers and surrounds the multiple light-emitting elements. The encapsulation structure is used to isolate water and oxygen to protect the light-emitting layers of the light-emitting elements, thereby ensuring the service life of the light-emitting elements.

[0055] In one embodiment, the encapsulation structure is a thin film encapsulation structure, which includes at least one inorganic encapsulation layer and at least one organic encapsulation layer stacked together. This embodiment can produce a display panel with a certain degree of flexibility.

[0056] In another embodiment, the packaging structure is a rigid package that includes encapsulation glass bonded to the array layer of the display panel via a sealant to accommodate multiple light-emitting elements within a cavity formed by the encapsulation glass and the sealant. The array layer is fabricated on a substrate and includes pixel circuits.

[0057] In the display panel provided by the embodiment of the present invention, the metal portion 20 is located directly below the light-emitting element 30, and the orthographic projection of the metal portion 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on the substrate 10. When the display panel is manufactured, the first electrode 31 is manufactured directly above the area corresponding to the metal portion 20. The metal portion 20 can provide a relatively flat substrate for the manufacture of the first electrode 31, so that the manufactured first electrode 31 is relatively flat. That is, in the display panel provided by the embodiment of the present invention, the first electrode 31 has a relatively flat surface, and the probability of the ambient light reflected by the first electrode 31 interfering with each other is reduced, thereby improving the dispersion phenomenon of the display panel in the dark state and improving the appearance quality. At the same time, the relatively flat first electrode 31 can also reduce the color difference of the pixel light-emitting area color at different viewing angles, improve the color deviation problem of the display panel with large viewing angles, and improve the display effect.

[0058] The embodiment of the present invention also includes a pixel circuit, which is fabricated on the substrate 10 and located below the light-emitting element 30. The pixel circuit includes a plurality of 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 switching transistors in the pixel circuit includes metal oxide. In application, the light emitted by the light-emitting element 30 may be reflected and refracted to the thin-film transistor below. In addition, ambient light may also penetrate the part of the film structure of the display panel from the area between adjacent light-emitting elements 30 to the thin-film transistor below. The active layer of the thin-film transistor is sensitive to light. After receiving light, the active layer will generate photo-generated leakage, causing the characteristics of the thin-film transistor device to change, thereby affecting the pixel circuit driving the light-emitting element to emit light, resulting in uneven display of the display panel. Based on this, the embodiment of the present 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 provided above the light emitting elements. The color filter layer includes a plurality of filter units and a light shielding portion. The light shielding portion can shield the area between adjacent light emitting elements to prevent ambient light from being emitted from the area between adjacent light emitting elements to the pixel circuit below. At the same time, the design of the color filter layer can also reduce the reflection of ambient light by the display panel. Specifically, Figure 5 A partial top view schematic diagram of another color filter layer in a display panel provided by an embodiment of the present invention, as shown in FIG. 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 projections of the filter units 51 on the plane where the light shielding portion 52 is located cover 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. 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. Among them, the red sub-pixel corresponds to the red filter unit, the green sub-pixel corresponds to the green filter unit, and the blue sub-pixel corresponds to the blue filter unit.

[0060] In one embodiment, Figure 6 for Figure 2 Another cross-sectional view at the midline A-A'. 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 with the light-emitting element 30, and the projection of the metal part 20 on the color filter layer 50 covers the first opening 53. The figure also illustrates 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, and each light-emitting element 30 corresponds to a second opening 61. The second opening 61 exposes the first electrode 31, and the light-emitting layer 32 is located within the second opening 61. The figure also illustrates 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 in the insulating layer.

[0061] In this embodiment, the orthographic projection of the metal portion 20 on the substrate 10 overlaps the orthographic projection of the first electrode 31 on the substrate 10. During display panel fabrication, the metal portion 20 provides a relatively flat substrate for the first electrode 31, making the fabricated first electrode 31 relatively flat. This reduces the likelihood of interference between ambient light reflected by the first electrode 31, thereby improving the display panel's dark state dispersion and enhancing its appearance. Furthermore, it reduces color variations in the pixel's luminous area at different viewing angles, thereby alleviating the color shift problem of the display panel at wide viewing angles. A color filter layer 50 is disposed on the side of the light-emitting element 30 facing away from the substrate 10. The filter elements 51 in the color filter layer 50 transmit visible light within a specific wavelength range. For example, a red filter element transmits red light, a green filter element transmits green light, and a blue filter element transmits blue light. In other words, the filter elements 51 prevent the transmission of light within wavelengths other than the specific wavelength range, thereby reducing the amount of ambient light entering the display panel. This reduces reflection of ambient light by the first electrode 31, and thus reduces reflection of ambient light by the display panel. Moreover, when light that passes through a color filter unit 51 is reflected by the first electrode 31 of the light-emitting element 30 overlapping with the filter unit 51 and then travels to a color filter unit of another color, it cannot pass through the color filter unit 51 of the other color and exit the display panel. This can also reduce the display panel's reflection of ambient light, so that the color filter layer 50 provided above the light-emitting element 30 can reduce the display panel's reflection of 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 pixel definition layer 60 is made of a light-transmitting material. The area between adjacent light-emitting elements 30 has a certain light transmittance. In the light-emitting direction e of the display panel, the light-shielding portion 52 in the color filter layer 50 overlaps with the pixel definition layer 60. The light-filtering portion 52 can block light and prevent it from penetrating the pixel definition layer 60 and emitting to the transistor device below. Figure 6In the embodiment, the projection of the metal part 20 on the color filter layer 50 covers the first opening 53, so that the light emitted from the first opening 53 to the pixel circuit below (as shown by the dotted arrow in the figure) can be blocked by the metal part 20. The metal part 20 can prevent the light from being emitted to the transistor device below, thereby reducing the risk of uneven display of the display panel.

[0063] Furthermore, the material used to make the metal part 20 includes a light-absorbing material, so that the metal part 20 can absorb the light incident on it, and accordingly the amount of light reflected by the metal part 20 becomes less, 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 portion 20. Specifically, in the display panel's light-emitting direction e, the first opening 53 overlaps with the light-emitting element 30. While ensuring that light emitted by the light-emitting element 30 can exit through the first opening 53 and has a certain range of light-emitting angles, the projection of the first electrode 31 on the color filter layer 50 is positioned within the first opening 53 along the display panel's light-emitting direction e. Alternatively, the area of the first electrode 31 is smaller than that of the first opening 53. This allows the metal portion 20 beneath the first electrode 31 to block light that penetrates the first opening 53, while the area of the first electrode 31 does not need to be excessively large. This avoids increasing the display panel's reflection of ambient light by overlying the area of the first electrode 31, which has a higher light reflectivity.

[0065] In another embodiment, Figure 7 for Figure 2 Another cross-sectional view at the midline A-A'. 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 multiple filter units 51 (only one is shown in the figure) and a light shielding portion 52. The light shielding portion 52 defines multiple first openings 53 (only one is shown in the figure). The projection of the filter unit 51 on the plane where the light shielding portion 52 is located 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 on the color filter layer 50 covers the first opening 53. The figure also illustrates 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, and each light-emitting element 30 corresponds to a second opening 61. 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 transparent material.

[0066] In this embodiment, the orthographic projection of the metal portion 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on the substrate 10. During display panel fabrication, the metal portion 20 provides a relatively flat substrate for the first electrode 31, thereby producing a relatively flat first electrode 31. The first electrode 31 has a relatively flat surface, thereby reducing the probability of interference between ambient light reflected by the first electrode 31. This improves the color dispersion of the display panel in the dark state and enhances the appearance quality. It also reduces the color difference of the pixel luminous area at different viewing angles, thereby improving the color shift problem of the display panel at large viewing angles. Furthermore, the color filter layer 50 above the light-emitting element 30 reduces the display panel's reflection of ambient light, and the light-shielding portion 52 in the color filter layer 50 shields the area between adjacent light-emitting elements 30, preventing light from penetrating the pixel definition layer 60 and radiating to the transistor device below. Furthermore, the orthographic projection of the first electrode 31 on the color filter layer 50 covers the first opening 53, so that the light emitted from the first opening 53 to the pixel circuit below (as indicated by the dotted arrow in the figure) can be blocked by the first electrode 31. The first electrode 31 can further prevent the light from being emitted to the transistor device below, thereby reducing the risk of uneven display of the display panel.

[0067] In some embodiments, the material used to make the pixel definition layer in the display panel includes a light-shielding material, so that the pixel definition layer between adjacent light-emitting elements can have a certain shielding effect on light, preventing light from penetrating the pixel definition layer and emitting to the pixel circuit below, so as to reduce the risk of uneven display on the display panel. At the same time, the pixel definition layer can also prevent light crosstalk between adjacent light-emitting elements. In addition, in order to ensure that the user has a good user experience, the display panel needs to have a large viewing angle, so it is necessary to ensure that the light output angle of the light-emitting element meets a certain range, and the side wall of the second opening of the corresponding pixel definition layer has a non-right angle with the plane where the substrate is located. That is to say, in the direction from the center of the second opening to the edge, the distance between the side wall of the second opening and the substrate gradually changes. Then there is still a certain transmittance at the side wall position of the second opening, and light can penetrate the side wall of the second opening and emit to the pixel circuit below. Based on this, the present invention continues to improve the structure of the display panel to solve the above problems.

[0068] Specifically, in one embodiment, Figure 8 for Figure 2 Another cross-sectional view at the midline A-A'. Figure 8As shown, the pixel definition layer 60 includes a plurality of second openings 61, which expose the first electrode 31. The light-emitting layer 32 is located within the second openings 61. The pixel definition layer 61 is made of a light-shielding material. As shown in the figure, the sidewalls M of the second openings 61 form a non-perpendicular angle α with the plane of the substrate 10; that is, the sidewalls M of the second openings 61 are sloped. The orthographic projection of the first electrode 31 on the substrate 10 overlaps the orthographic projection of the sidewalls M on the substrate 10. A pixel circuit for driving the light-emitting element 30 to emit light is also disposed on the substrate 10, although this circuit is not shown in the figure.

[0069] In this embodiment, the orthographic projection of the metal portion 20 on the substrate 10 covers the orthographic projection of the first electrode 31 on the substrate 10. When the display panel is manufactured, the metal portion 20 can provide a relatively flat substrate for the manufacture 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 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 pixel light-emitting area at different viewing angles, and improve the color deviation problem of the display panel at large viewing angles. In addition, the first electrode 31 can block the light penetrating the side wall M of the second opening 61 (as indicated by the dotted arrow in the figure), preventing the light from being emitted from the side wall M of the second opening 61 to the transistor device below, thereby reducing the risk of uneven display of the display panel.

[0070] Specifically, in another embodiment, Figure 9 for Figure 2 Another cross-sectional view at the midline A-A'. Figure 9 As shown, the side wall M of the second opening 61 of the pixel definition layer 60 has a non-right angle α with the plane of the substrate 10; the orthographic projection of the metal part 20 on the substrate 10 covers the orthographic projection of the side wall M on the substrate 10. In this embodiment, the orthographic projection of the metal part 20 on the substrate 10 is set to cover the orthographic projection of the first electrode 31 on the substrate 10, which can make the manufactured first electrode 31 relatively flat, reduce the probability of mutual interference between the ambient light reflected by the first electrode 31, and improve the 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 pixel luminous area color at different viewing angles, and improve the color deviation problem of the display panel at large viewing angles. In addition, the metal part 20 can block the light penetrating the side wall M of the second opening 61 (as indicated by the dotted arrow in the figure), preventing the light from being emitted from the side wall M of the second opening 61 to the transistor device below, thereby reducing the risk of uneven display of the display panel.

[0071] in addition, Figure 8 and Figure 9In the embodiment, the display panel may also include an anti-reflection layer. The anti-reflection layer is located on a side of the light-emitting element away from the substrate. The anti-reflection layer is used to reduce the reflection of ambient light by the display panel to improve the display effect of the display panel.

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

[0073] In one embodiment, the metal part 20 is not connected to the potential. That is, when the display panel is working, no voltage signal is transmitted on the metal part 20. Optionally, the metal part 20 is made of the same layer and material as the functional structure in the display panel, but the metal part 20 does not reuse the circuit elements in the pixel circuit (such as wiring or electrodes). The setting of the metal part 20 can provide a relatively flat substrate for making the light-emitting element 30, so that the first electrode 31 made is relatively flat, improving the dispersion problem of the display panel in the dark state, and improving the color deviation problem of the display panel at large viewing angles. Moreover, the setting of the metal part 20 does not change the design of the circuit elements in the pixel circuit, so as to prevent the metal part 20 made in a large area from affecting the electrical performance of the circuit elements and increasing the complexity of the pixel circuit design.

[0074] In one embodiment, the metal portion 20 is reused as a signal line in the display panel. That is, when the display panel is operating, the metal portion 20 transmits a voltage signal. In this embodiment, the shape of the signal line directly below the light-emitting element 30 is modified to serve as the metal portion 20. The design of the metal portion 20 does not add additional structure to the display panel, and has minimal impact on the pixel circuit wiring.

[0075] Specifically, the shape of the metal portion 20 is the same as the shape of the first electrode 31 . Figure 10 Schematic diagram of the shape of the metal portion and the first electrode in the embodiment of the present invention Figure 1 , Figure 11 Schematic diagram of the shape of the metal portion and the first electrode in the embodiment of the present invention Figure 2 . Figure 10 and Figure 11 Both are schematic top views of the display panel, illustrating the overlap of the first electrode 31 and the metal portion 20 , taking the metal portion 20 being reused as a signal line in the display panel as an example, that is, the metal portion 20 is a partial line segment of the signal line.

[0076] like Figure 10 As shown, the first electrode 31 and the metal portion 20 are both rectangular in shape. Figure 11As shown, the shapes of the first electrode 31 and the metal portion 20 are both circular. If the shape of the metal portion 20 is set to be the same as the shape of the first electrode 31, the area of the metal portion 20 below the first electrode 31 does not need to be too large, which can avoid the setting of the metal portion 20 affecting other structures in the display panel. For example, the first electrode 31 needs to be connected to the pixel circuit below through a via hole. First, the first electrode 31 is connected to the connecting electrode (see Figure 4 as well as Figure 6 The connection is then made by connecting the connecting electrode to the drain of the transistor through a via in the insulating layer. By setting the shape of the metal portion 20 to be the same as that of the first electrode 31, the metal portion 20 does not need to be made too large, thus avoiding the space occupied by the metal portion 20 and reducing the impact on the via connecting the connecting electrode to the transistor.

[0077] In the embodiment of the present invention, the shape of the first electrode 31 may also be a regular polygon or other shapes. In practice, the shape of the first electrode 31 may be designed according to specific needs.

[0078] In one embodiment, Figure 12 A cross-sectional schematic diagram of another display panel provided by an embodiment of the present invention is shown in FIG. Figure 12 As shown, the display panel also includes a first metal layer M1 and a second metal layer M2 located on the substrate 10, wherein the thickness of the second metal layer M2 is greater than the thickness of the first metal layer M1; wherein the metal part 20 is located in the second metal layer M2. The thicker the metal layer, the greater the impact 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 a metal layer with a larger thickness, and the metal part 20 is made into 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. The metal part 20 can provide a relatively flat base for the production of the first electrode 31. In the embodiment of the present invention, the first electrode 31 has good flatness, which can improve the dispersion phenomenon of the display panel in the dark state and enhance the appearance quality of the product; at the same time, it can improve the color deviation problem of the display panel with large viewing angle.

[0079] Specifically, such as Figure 12 As shown in FIG, the transistor T in the pixel circuit includes a gate g1, a source g2, and a drain g3. The first electrode 31 of the light-emitting element 30 is connected to the drain g3. The metal portion 20 is located on the same layer as the source g2 and drain g3. That is, the source g2 and drain g3 are located in the second metal layer M2. Optionally, the second metal layer can be made of titanium / aluminum / titanium. The first metal layer can be made of molybdenum.

[0080] In some embodiments, the display panel includes at least two metal layers located 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 on the substrate 10, that is, no other metal layer processes are performed after the process of the metal portion 20 and before the first electrode of the light-emitting element 30 is formed. There are no other metal structures above the metal portion 20 that affect the flatness of the substrate below the first electrode 31. After the insulating layer is formed on the metal portion 20, a relatively flat substrate can be provided for the formation of the first electrode 31, so that the flatness of the first electrode 31 is better, that is, the first electrode 31 in the embodiment of the present invention has good flatness. The probability of interference between the ambient light reflected by the first electrode 31 is reduced, which can improve the 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 pixel light-emitting area at different viewing angles, improve the color shift problem of the display panel at large viewing angles, and enhance the display effect.

[0081] Specifically, the display panel further includes an organic insulating layer, as described above Figure 12 As shown, the organic insulating layer 71 contacts the metal part 20 and covers the metal part 30. The organic insulating layer 71 is a planarization layer. This embodiment shows that the metal part 20 is located in the same layer as the source electrode g2 and the drain electrode g3, that is, the metal part 20 is manufactured in the same process as the source electrode g2 and the drain electrode g3. The organic insulating layer 71 is manufactured after the source and drain electrode processes, so that the organic insulating layer 71 contacts and covers the metal part 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 manufactured, the first electrode 31 is manufactured directly above the metal part 20. The surface of the organic insulating layer 71 manufactured on the large area of the metal part 20 is also relatively flat, thereby providing a relatively flat base for the first electrode 31, so that the flatness of the manufactured first electrode 31 is high, that is, the first electrode 31 in the embodiment of the present invention has good flatness. The probability of interference between ambient light reflected by the first electrode 31 is reduced, improving the display panel's color dispersion in the dark state. Furthermore, the relatively flat first electrode 31 can reduce color variations in the pixel's luminous area at different viewing angles, improving the display panel's color shift at wide viewing angles and enhancing the display quality. Furthermore, 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 via a via, thereby electrically connecting the first electrode 31 to the transistor in the pixel circuit.

[0082] In another embodiment, Figure 13A cross-sectional schematic diagram of another display panel provided by an embodiment of the present invention is shown in FIG. Figure 13 As shown, the organic insulating layer 71 contacts the metal part 20 and covers the metal part 30. In this embodiment, an insulating layer (not shown) is provided between the metal part 30 and the source and drain of the transistor T, that is, the metal part 30 and the source and drain are located on different metal layers. When the display panel is manufactured, an insulating layer is manufactured on the entire surface after the process of the source g2 and the drain g3, and then the insulating layer is etched to form a via hole exposing the drain g3; then the metal part 30 is manufactured on the insulating layer; then the entire organic insulating layer 71 is manufactured on the metal part 30, wherein the organic insulating layer 71 has both insulating and flattening functions; then the organic insulating layer 71 is etched to form a via hole exposing the drain g3, that is, the via hole in the insulating layer above the drain g3 and the via hole in the organic insulating layer 71 are connected to jointly expose the drain g3. Then, a first electrode 31 is formed on the organic insulating layer 71. The first electrode 31 is formed directly above the metal portion 20. The surface of the organic insulating layer 71 formed on the large area of the metal portion 20 is also relatively flat, thereby providing a relatively flat substrate for the first electrode 31. This results in a high degree of flatness for the first electrode 31, which can improve the display panel's color dispersion in the dark state and the color shift problem at large viewing angles. Similarly, when the first electrode 31 is formed, 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 an embodiment, the metal portion 20 is fabricated in a metal layer above the source and drain electrodes, and the metal layer where the metal portion 20 is located 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 portion 20 is reused as a signal line in the display panel. For example, the metal portion 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. Setting the metal portion 20 to be electrically connected to the positive power signal line can reduce the overall resistance of the positive power signal line, 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 by an embodiment of the present invention is shown in FIG. Figure 14As shown, the display panel includes an inorganic insulating layer 72 and an organic insulating layer 71. The inorganic insulating layer 72 contacts and covers the metal part 20, and the organic insulating layer 71 contacts and covers the inorganic insulating layer 72. That is, the inorganic insulating layer 72 and the organic insulating layer 71 are arranged on the metal part 20. The figure also illustrates a transistor T in the pixel circuit, 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 figure also illustrates a metal structure 80, which is located on the side of the inorganic insulating layer 70 away from the substrate 10, that is, the metal structure 80 is manufactured after the process of the inorganic insulating layer 70. Among them, in the light emitting direction e of the display panel, the metal structure 80 does not overlap with the first electrode 31.

[0086] Figure 14 The figure shows that the metal part 20 and the source and drain of the transistor T are located in the same layer. Specifically, when the display panel is manufactured, the metal part 20 is manufactured in the same process as the source g2 and the drain g3. After the process of the metal part 20, an inorganic insulating layer 72 is manufactured on the entire surface. The inorganic insulating layer 72 contacts and covers the metal part 20, and the inorganic insulating layer 72 is etched to form a via (not marked in the figure) exposing the drain g3; then a metal structure 80 is manufactured on the inorganic insulating layer 72. The manufactured metal structure 80 avoids the area where the metal part 20 is located to prevent the metal structure 80 from making the surface above the metal part 20 uneven; then an organic insulating layer 71 is manufactured after the process of the metal structure 80, wherein the organic insulating layer 71 has both insulating and flattening functions; then the organic insulating layer 71 is etched to form a via exposing the drain g3, that is, the via of the inorganic insulating layer 72 and the via of the organic insulating layer 71 above the drain g3 are connected to expose the drain g3. Then, a first electrode 31 is formed on the organic insulating layer 71. The first electrode 31 is formed directly above the metal portion 20. The inorganic insulating layer 72 and the organic insulating layer 71 formed on the large area of the metal portion 20 are also relatively flat, thereby providing a relatively flat substrate for the first electrode 31. This results in a high degree of flatness for the first electrode 31, which can improve the display panel's dispersion in the dark state and the color shift problem at large viewing angles. Furthermore, when the first electrode 31 is formed, a connecting electrode 40 is formed in the same process. The connecting electrode 40 can be integrally formed with the first electrode 31 and connected to the drain electrode g3 below through a via.

[0087] In one 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 to a signal line located in a different metal layer to form a double-layer metal routing, thereby reducing the overall resistance on the signal line. When the display panel is working, it can reduce the voltage drop loss when transmitting the voltage signal on the signal line, thereby reducing the power consumption of the display panel.

[0088] An embodiment of the present invention further provides a display device, Figure 15 This is a schematic diagram of a display device according to an embodiment of the present invention. As shown in the figure, the display device includes a display panel 100 according to any embodiment of the present invention. The structure of the display panel 100 has been described in the above-mentioned display panel embodiments and will not be repeated here. The display device according to the embodiments of the present invention can be any device with a display function, such as a mobile phone, tablet computer, laptop computer, e-reader, television, smart wearable product, or the like.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; a metal portion, located on one side of the substrate; a light-emitting element, located on a 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, located on a 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, wherein the light shielding portion defines a plurality of first openings; A pixel definition layer is located on a side of the metal portion away from the substrate, the pixel definition layer includes a second opening, the second opening exposes the first electrode, and the light emitting layer is located in the second opening; wherein, The light emitting element further includes a connecting electrode, the connecting electrode is provided in the same layer as the first electrode and is connected to the first electrode, and the connecting electrode is connected to the pixel circuit; The orthographic projection of the metal portion on the substrate covers the orthographic projection of the first electrode on the substrate; in, The display panel includes a first metal layer and a second metal layer located on the substrate, wherein the thickness of the second metal layer is greater than the thickness of the first metal layer; The metal portion is located in the second metal layer; or, The display panel includes an inorganic insulating layer and an organic insulating layer, the inorganic insulating layer contacts and covers the metal portion, and the organic insulating layer contacts and covers the inorganic insulating layer; or The metal portion is reused as a signal line in the display panel; or, The metal portion does not receive an electric potential; or The pixel definition layer includes a light-shielding material or a light-transmitting material; and / or the metal portion includes a light-absorbing material.

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

3. The display panel according to claim 1, wherein: The display panel includes at least two metal layers located between the substrate and the light emitting element; wherein, Along a direction from the first electrode to the second electrode, the metal portion is located in a metal layer closest to the light emitting element.

4. The display panel according to claim 1, wherein: Along the direction from the first electrode to the second electrode, the projection of the first electrode on the color filter layer is located within the first opening.

5. The display panel according to claim 1, wherein: The metal portion covers the first opening along a direction from the first electrode to the second electrode.

6. The display panel according to claim 1, wherein: The sidewall of the second opening has a non-right angle with respect to the plane where the substrate is located, and the orthographic projection of the first electrode on the substrate covers the orthographic projection of the sidewall on the substrate.

7. The display panel according to claim 1, wherein: The display panel includes an organic insulating layer that contacts and covers the metal portion.

8. The display panel according to claim 1, wherein: The metal portion has the same shape as the first electrode.

9. A display panel, characterized in that: include: substrate; a metal portion, located on one side of the substrate; a light-emitting element, located on a 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, located on a 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, wherein the light shielding portion defines a plurality of first openings; A pixel definition layer is located on a side of the metal portion away from the substrate, the pixel definition layer includes a second opening, the second opening exposes the first electrode, and the light emitting layer is located in the second opening; wherein, The light emitting element further includes a connecting electrode, the connecting electrode is provided in the same layer as the first electrode and is connected to the first electrode, and the connecting electrode is connected to the pixel circuit; The orthographic projection of the first electrode on the substrate is located within the orthographic projection of the metal portion on the substrate.

10. The display panel according to claim 9, wherein: The display panel includes a first metal layer and a second metal layer located on the substrate, wherein the thickness of the second metal layer is greater than the thickness of the first metal layer; The metal portion is located in the second metal layer.

11. A display panel, characterized in that: include: substrate; a metal portion, located on one side of the substrate; a light-emitting element, located on a 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, located on a 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, wherein the light shielding portion defines a plurality of first openings; A pixel definition layer is located on a side of the metal portion away from the substrate, the pixel definition layer includes a second opening, the second opening exposes the first electrode, and the light emitting layer is located in the second opening; wherein, The orthographic projection of the metal portion on the substrate covers the orthographic projection of the first electrode on the substrate; in, The display panel includes a first metal layer and a second metal layer located on the substrate, wherein the thickness of the second metal layer is greater than that of the first metal layer; wherein the metal portion is located in the second metal layer; or The display panel includes an inorganic insulating layer and an organic insulating layer, the inorganic insulating layer contacts and covers the metal portion, and the organic insulating layer contacts and covers the inorganic insulating layer; or The metal portion is reused as a signal line in the display panel; or, The metal portion does not receive an electric potential; or The pixel definition layer includes a light-shielding material or a light-transmitting material; and / or the metal portion includes a light-absorbing material.

12. A display panel, characterized in that: include: substrate; a metal portion, located on one side of the substrate; a light-emitting element, located on a 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, located on a 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, wherein the light shielding portion defines a plurality of first openings; A pixel definition layer is located on a side of the metal portion away from the substrate, the pixel definition layer includes a second opening, the second opening exposes the first electrode, and the light emitting layer is located in the second opening; wherein, The orthographic projection of the first electrode on the substrate is located within the orthographic projection of the metal portion on the substrate.

13. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 12.

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