Display panel and display device

Abstract

The invention relates to a display panel and a display device. The display panel comprises a substrate, a plurality of light emitting units, a pixel defining layer and at least one isolation structure. The light-emitting unit comprises a first electrode and a light-emitting layer which are sequentially arranged in the direction away from the substrate. The pixel defining layer is located on the side, away from the substrate, of the layer where the first electrode is located and is provided with a plurality of pixel openings, and the pixel openings expose at least part of the first electrode; at least part of the light-emitting layer and at least part of the isolation structure are located in the pixel opening, the light-emitting layer is located on the side, away from the substrate, of the isolation structure, and the orthographic projection of the isolation structure on the substrate and the orthographic projection of the first electrode on the substrate have an annular first overlapping area. According to the display panel disclosed by the embodiment of the invention, in the process of forming the light-emitting layer, the problems of rubbing between the high-precision metal mask and the first electrode and the like can be avoided, so that the phenomena of dark spots and the like of the display panel are further avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] With the continuous development of display technology, organic light-emitting diode (OLED) display panels have become the research hotspot and technology development direction of major manufacturers due to their advantages such as wide color gamut, high contrast, thin and light design, self-luminescence, and wide viewing angle. At present, OLED display panels have been widely used in terminal products such as smart phones, tablets, computers and TVs.

[0003] However, with the continuous advancement of technology and the growing demand of consumers, these terminal products have put forward higher and higher resolution requirements for display panels, such as screen resolution (i.e. pixel density) requirements exceeding 400ppi. Therefore, in the process of preparing OLED display panels, high-precision metal masks (FMM, Fine Metal Mask) are often selected to evaporate organic light-emitting materials to achieve high resolution of OLED display panels. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and proposes a display panel and a display device.

[0005] In order to achieve the above object, the present disclosure provides a display panel, comprising:

[0006] substrate;

[0007] A plurality of light-emitting units, each of which comprises a first electrode and a light-emitting layer which are sequentially arranged in a direction away from the substrate;

[0008] A pixel defining layer and at least one isolation structure, wherein the pixel defining layer is located on a side of the layer where the first electrode is located away from the substrate and has a plurality of pixel openings, wherein the pixel openings expose at least a portion of the first electrode; at least a portion of the light-emitting layer and at least a portion of the isolation structure are located in the pixel openings, the light-emitting layer is located on a side of the isolation structure away from the substrate, and an orthographic projection of the isolation structure on the substrate and an orthographic projection of the first electrode on the substrate have a first annular overlapping area.

[0009] In some embodiments, the emitted light of the plurality of light emitting units includes a first color light and a second color light;

[0010] The first electrode in the light-emitting unit emitting the first color light has no overlap with the orthographic projection of the pixel defining layer on the substrate, and the first electrode in the light-emitting unit emitting the second color light has overlap with the orthographic projection of the pixel defining layer on the substrate;

[0011] Alternatively, the first electrode in the light-emitting unit emitting the first color light has a second overlapping area with the orthographic projection of the pixel defining layer on the substrate, and the first electrode in the light-emitting unit emitting the second color light has a third overlapping area with the orthographic projection of the pixel defining layer on the substrate, and the second overlapping area and the third overlapping area are both annular in shape, and the ring width of the second overlapping area is smaller than the ring width of the third overlapping area;

[0012] The orthographic projection of the first electrode in the light-emitting unit emitting the first color light and the isolation structure on the substrate has the first overlapping area.

[0013] In some embodiments, an area of ​​a positive projection of a first electrode in a light emitting unit emitting light of a first color on the substrate is smaller than an area of ​​a positive projection of a first electrode in a light emitting unit emitting light of a second color on the substrate.

[0014] In some embodiments, the first color light includes green light, and the second color light includes at least one of blue light and red light.

[0015] In some embodiments, the orthographic projection of the isolation structure on the substrate overlaps with the orthographic projection of the pixel defining layer on the substrate;

[0016] A surface of the pixel defining layer away from the substrate and a surface of the isolation structure away from the substrate have a boundary line;

[0017] The maximum distance from the surface of the pixel defining layer away from the substrate to the substrate is a first distance, the maximum distance from the surface of the isolation structure away from the substrate to the substrate is a second distance, and the maximum distance from the boundary line to the substrate is a third distance, wherein the third distance is less than at least one of the first distance and the second distance.

[0018] In some embodiments, the second distance is not less than 2 / 3 of the first distance, and / or the third distance is not less than 2 / 3 of the first distance.

[0019] In some embodiments, the isolation structure and the pixel defining layer are connected as an integrated structure.

[0020] In some embodiments, the display panel has a display area and a non-display area surrounding the display area;

[0021] The display panel further comprises an isolation barrier wall located in the non-display area and on one side of the substrate, and a spacer structure located on a side of the pixel defining layer away from the substrate, the isolation barrier wall surrounds the display area, an orthographic projection of the spacer structure on the substrate overlaps with an orthographic projection of the pixel defining layer on the substrate, and a maximum distance from a surface of the isolation barrier wall away from the substrate to the substrate and a maximum distance from a surface of the spacer structure away from the substrate to the substrate are both greater than a maximum distance from a surface of the pixel defining layer away from the substrate to the substrate;

[0022] The isolation structure and the spacer structure are arranged on the same layer, and / or the isolation structure and part of the isolation retaining wall are arranged on the same layer.

[0023] In some embodiments, the maximum distance from the surface of the isolation structure to the light-emitting layer is not less than 1.5 μm, and / or the isolation structure and the pixel defining layer as a whole have a fourth overlapping area with the orthographic projection of the first electrode on the substrate, and the ring width of the fourth overlapping area is not less than 0.6 μm.

[0024] In some embodiments, the isolation structure includes a bottom surface facing the substrate and a side surface facing the pixel opening, and an angle between the bottom surface and the side surface is not less than 20°.

[0025] The present disclosure also provides a display device, comprising a display panel as described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0027] Figure 1 is a schematic diagram of a planar structure of a display panel in some embodiments;

[0028] Figure 2 is a schematic diagram of a partial planar structure of a display panel in some embodiments;

[0029] Figure 3 is a cross-sectional structural diagram of a display panel in some embodiments;

[0030] Figure 4 is a schematic diagram of a cross-sectional structure of a display panel during a preparation process in some embodiments;

[0031] Figure 5 is a schematic diagram of a planar structure of a display panel in some embodiments of the present disclosure;

[0032] Figure 6is a schematic diagram of a cross-sectional structure of a display panel in some embodiments of the present disclosure;

[0033] Figure 7 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure;

[0034] Figure 8 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure;

[0035] Fig. 9 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure;

[0036] Fig.10 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure;

[0037] Fig.11 is a schematic diagram of a cross-sectional structure of a display panel during the preparation process in some embodiments of the present disclosure;

[0038] Fig.12 It is a schematic diagram of the cross-sectional structure of the display panel in some other embodiments of the present disclosure. DETAILED DESCRIPTION

[0039] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0041] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] As used herein, "parallel" and "perpendicular" include the described situation and the situation similar to the described situation, and the range of the similar situation is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°.

[0043] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0044] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0045] In the related art, as the resolution of OLED display panels increases, the thickness of the high-precision metal mask used in the process of preparing the display panel needs to become thinner, and when the thickness of the high-precision metal mask becomes thinner, the high-precision metal mask cannot avoid sagging. The sagging of the high-precision metal mask may further affect the display effect of the OLED display panel.

[0046] Figure 1 is a schematic diagram of a planar structure of a display panel in some embodiments.

[0047] like Figure 1 As shown, the display panel includes a display area AA and a non-display area NA surrounding the display area AA.

[0048] Figure 2 is a schematic diagram of a partial planar structure of a display panel in some embodiments, specifically: Figure 1 Schematic diagram of the plane structure in the dotted box a.

[0049] like Figure 2 As shown, the display panel includes a substrate 10, a plurality of light emitting units 30 located at one side of the substrate 10 and located at the display area AA, and an isolation barrier wall 60 located at one side of the substrate 10 and located at the non-display area NA. The isolation barrier wall 60 surrounds the display area AA and can isolate water vapor in the air from entering the display area AA and affecting the light emitting effect of the light emitting units 30 in the display area AA.

[0050] Figure 3 is a cross-sectional structural diagram of a display panel in some embodiments, specifically including Figure 2 Schematic diagram of the cross-sectional structure cut along the cutting lines BB', CC', and DD'.

[0051] like Figure 3 As shown, the display panel also includes a driving circuit layer 20 located between the light-emitting unit 30 and the substrate 10. The light-emitting unit 30 includes a first electrode 31, a light-emitting layer, and a second electrode (the light-emitting layer and the second electrode are not shown in the figure) stacked in sequence in a direction away from the substrate 10. The first electrode 31 can be, for example, an anode, and the second electrode can be, for example, a cathode. A thin film transistor is provided in the driving circuit layer 20, and the thin film transistor is electrically connected to the first electrode 31, and is used to provide a driving signal to the first electrode 31 to make the light-emitting unit 30 emit light.

[0052] like Figure 3 As shown, the display panel further includes a pixel defining layer 40 located between the first electrode 31 and the light emitting layer, and a spacer structure 50 located on a side of the pixel defining layer 40 away from the substrate 10. The pixel defining layer 40 is used to define a plurality of pixel openings, and at least a portion of the light emitting layer and at least a portion of the first electrode 31 are located in the pixel openings.

[0053] like Figure 2 As shown, the spacer structure 50 overlaps with the orthographic projection of the pixel defining layer 40 on the substrate 10 , and the orthographic projection of the spacer structure 50 on the substrate 10 is located between the orthographic projections of the plurality of pixel openings on the substrate 10 .

[0054] Figure 4 1 is a schematic diagram of the cross-sectional structure of a display panel during the preparation process in some embodiments, specifically a schematic diagram of the cross-sectional structure of the process step of forming a light-emitting layer.

[0055] like Figure 4 As shown, when forming the light-emitting layer, a high-precision metal mask 70 is required to form the organic light-emitting material in the pixel opening. In this process, the isolation retaining wall 60 and the spacer structure 50 can support the high-precision metal mask 70, and the maximum distance from the surface of the isolation retaining wall 60 away from the substrate 10 to the substrate 10 is greater than the maximum distance from the surface of the pixel defining layer 40 away from the substrate 10 to the substrate 10, and the maximum distance from the spacer structure 50 to the substrate 10 is greater than the maximum distance from the surface of the pixel defining layer 40 away from the substrate 10 to the substrate 10. In this case, the high-precision metal mask 70 located above the pixel opening will sag. Specifically, for example, the high-precision metal mask 70 will sag from the surface of the pixel defining layer 40 away from the substrate 10. Figure 4 The middle dotted line position drops to Figure 4 Solid middle line position.

[0056] like Figure 3 As shown, the pixel defining layer 40 has no overlap with the orthographic projection of the first electrode 31 in some of the light-emitting units 30 on the substrate 10. In other examples, the orthographic projection of the pixel defining layer 40 on the substrate 10 overlaps with the orthographic projection of the first electrode 31 in some of the light-emitting units 30 on the substrate 10, but the overlapping area is relatively small. All of the above-mentioned situations will lead to insufficient coverage of the first electrode 31 by the pixel defining layer 40, and the coverage refers to the ring width of the overlapping area of ​​the orthographic projection of the pixel defining layer 40 on the substrate 10 and the orthographic projection of the first electrode 31 on the substrate 10. On this basis, the drooping high-precision metal mask 70 may be scratched with the first electrode 31, and may also cause electrostatic reaction with the first electrode 31, thereby causing the light-emitting unit 30 where the first electrode 31 is located to fail to emit light successfully, resulting in problems such as dark spots on the display panel.

[0057] In addition, in some other display panels, since the pixel defining layer 40 does not cover the first electrode 31 sufficiently, after the light-emitting layer is formed, the edges of the first electrode 31 in some light-emitting units 30 are exposed. In this case, after the subsequent second electrode is formed, the edges of the second electrode and the first electrode 31 will be electrically connected, causing a short circuit, and the corresponding light-emitting unit 30 will be unable to emit light, resulting in dark spots and other problems on the display panel.

[0058] The above technical problems are particularly serious in tandem OLED display panels. The principle of tandem OLED display panels can be simply understood as using multiple light-emitting layers connected in series through an intermediate connecting layer to achieve display. The dark spot problem caused by insufficient coverage of the first electrode 31 by the pixel defining layer 40 is a more serious product defect problem in this type of product.

[0059] In order to at least alleviate or solve one of the above-mentioned technical problems, the present disclosure provides a display panel and a display device.

[0060] Figure 5 1 is a schematic diagram of the planar structure of the display panel in some embodiments of the present disclosure, specifically a schematic diagram of the planar structure of the display panel in the display area AA. Figure 6 is a schematic diagram of the cross-sectional structure of a display panel in some embodiments of the present disclosure, specifically along Figure 5 Schematic diagram of the cross-sectional structure cut along the middle cutting line XX'.

[0061] like Figure 5 and Figure 6 As shown, a display panel disclosed in the present invention includes: a substrate 10, a plurality of light-emitting units 30, a pixel defining layer 40 and at least one isolation structure 80.

[0062] Among them, Figure 6 As shown, the light emitting unit 30 includes a first electrode 31 , a light emitting layer 32 , and a second electrode 33 which are sequentially arranged in a direction away from the substrate 10 .

[0063] The pixel defining layer 40 is located on a side of the layer where the first electrode 31 is located away from the substrate 10 , and has a plurality of pixel openings, wherein the pixel openings expose at least a portion of the first electrode 31 .

[0064] For example, in Figure 5 and Figure 6 In the illustrated embodiment, the plurality of light emitting units 30 include a plurality of first light emitting units 301 and a plurality of second light emitting units 302. In the first light emitting units 301, the pixel openings expose the first electrodes 31. In the second light emitting units 302, the pixel openings expose portions of the first electrodes 31.

[0065] At least a portion of the light emitting layer and at least a portion of the isolation structure 80 are located in the pixel opening.

[0066] For example, in one example, the light emitting layer and the isolation structure 80 are located in the pixel opening. Figure 6In the example shown, a portion of the light emitting layer 32 and the isolation structure 80 are located in the pixel opening. In another example, a portion of the light emitting layer and a portion of the isolation structure 80 are located in the pixel opening. In another example, a portion of the isolation structure 80 is located within the pixel opening and the light emitting layer is located within the pixel opening.

[0067] Specifically, the pixel defining layer 40 includes a first surface 401 facing away from the substrate 10 and a second surface 402 facing the substrate 10, and a first side surface 403 connected between the first surface 401 and the second surface 402, and the first side surface 403 faces the pixel opening. Among them, part of the light-emitting layer is located in the pixel opening, which means that the orthographic projection of a part of the light-emitting layer on the substrate 10 overlaps with the orthographic projection of the second surface 402 on the substrate 10, and another part of the light-emitting layer is located in the pixel opening, that is, in contact with the first side surface 403. Similarly, part of the isolation structure 80 is located in the pixel opening, which means that the orthographic projection of a part of the isolation structure 80 on the substrate 10 overlaps with the orthographic projection of the second surface 402 on the substrate 10, and another part of the isolation structure 80 is located in the pixel opening.

[0068] The light-emitting layer is located on a side of the isolation structure 80 away from the substrate 10, and the orthographic projection of the isolation structure 80 on the substrate 10 and the orthographic projection of the first electrode 31 on the substrate 10 have a first overlapping region, and the shape of the first overlapping region is annular. It can be understood that the shape of the first overlapping region is annular, which means that the shape of the orthographic projection of the isolation structure 80 on the substrate 10 is annular and surrounds the center of the pixel opening.

[0069] In addition, it should be noted that the ring can be a polygonal ring such as a square ring, a circular ring, and other irregular rings. It is understandable that the shape of the ring is actually affected by the shape of the pixel opening. For example, if the orthographic projection of the pixel opening on the substrate 10 is a rectangle, then the shape of the orthographic projection of the isolation structure 80 on the substrate 10 is a rectangular ring, and the first overlapping area of ​​the orthographic projection of the isolation structure 80 on the substrate 10 and the orthographic projection of the first electrode 31 on the substrate 10 is also a rectangular ring.

[0070] In the embodiment of the present disclosure, at least a portion of the isolation structure 80 is disposed within the pixel opening, and the orthographic projection of the isolation structure 80 on the substrate 10 is overlapped with the orthographic projection of the first electrode 31 on the substrate 10, that is, the isolation structure 80 can cover the first electrode 31, isolate the first electrode 31 from the sagging high-precision metal mask 70, and avoid the sagging high-precision metal mask 70 and the first electrode 31 from being scratched in the process step of forming the light-emitting layer. At the same time, it can also avoid the situation where the first electrode 31 is still exposed after the light-emitting layer is formed, resulting in a short circuit between the second electrode and the first electrode 31 after the second electrode is formed, thereby avoiding the problem of poor light emission of the light-emitting unit 30 and dark spots on the display panel.

[0071] Optionally, the isolation structure 80 is made of insulating material.

[0072] Optionally, the display panel further includes a driving circuit layer 20 between the substrate 10 and the light emitting unit 30. The driving circuit layer 20 is provided with a thin film transistor, which is electrically connected to the first electrode 31 and is used to provide a driving signal to make the light emitting unit 30 emit light, so that the display panel can realize display.

[0073] Specifically, in one example, the driving circuit layer 20 includes an active layer, a gate insulating layer, a gate, an interlayer dielectric layer, a source-drain metal layer and a first planarization layer which are stacked in sequence away from the substrate 10. Among them, the source-drain metal layer includes a source and a drain. The thin film transistor includes an active layer, a gate, a source and a drain. Among them, the active layer includes a channel portion and a source connection portion and a drain connection portion located on both sides of the channel portion. The source connection portion is electrically connected to the source, and the drain connection portion is electrically connected to the drain. Both the source connection portion and the drain connection portion can be doped with impurities (for example, N-type impurities or P-type impurities) with a higher impurity concentration than the channel portion. The channel portion is directly opposite to the gate, and when the voltage signal loaded on the gate reaches a certain value, a carrier path is formed in the channel portion, and the drain and source are turned on. The first electrode 31 is electrically connected to the drain through a via that passes through the first planarization layer.

[0074] In another example, the driving circuit layer 20 further includes a metal conductive layer and a second planarization layer located on a side of the first planarization layer away from the substrate 10. The first electrode 31 is electrically connected to the metal conductive layer through a via hole penetrating the second planarization layer, and the metal conductive layer is electrically connected to the drain through a via hole penetrating the first planarization layer.

[0075] The embodiments of the present disclosure exemplarily list the structural components of the driving circuit layer 20 in some display panels, but do not limit the structure of the driving circuit layer 20. The embodiments of the present disclosure do not specifically limit the structure of the driving circuit layer 20.

[0076] In some embodiments, the light emitted by the plurality of light emitting units 30 includes a first color light and a second color light. Figure 5 and Figure 6 In the illustrated embodiment, the first light emitting unit 301 emits light of a first color, and the second light emitting unit 302 emits light of a second color.

[0077] like Figure 6As shown, the first electrode 31 in the light-emitting unit 30 emitting the first color light has no overlap with the orthographic projection of the pixel defining layer 40 on the substrate 10, and the first electrode 31 in the light-emitting unit 30 emitting the second color light has overlap with the orthographic projection of the pixel defining layer 40 on the substrate 10. Among them, the orthographic projection of the first electrode 31 in the light-emitting unit 30 emitting the first color light and the isolation structure 80 on the substrate 10 has a first overlapping area.

[0078] That is, the first electrode 31 in the first light-emitting unit 301 has no overlap with the orthographic projection of the pixel defining layer 40 on the substrate 10, and the first electrode 31 in the second light-emitting unit 302 has an overlap with the orthographic projection of the pixel defining layer 40 on the substrate 10. In this case, the first electrode 31 in the first light-emitting unit 301 has a first overlapping area with the orthographic projection of the isolation structure 80 on the substrate 10, that is, the isolation structure 80 can cover the edge of the first electrode 31 in the first light-emitting unit 301.

[0079] In the embodiment of the present disclosure, the first electrode 31 in the first light-emitting unit 301 does not overlap with the orthographic projection of the pixel defining layer 40 on the substrate 10, that is, the edge of the first electrode 31 in the first light-emitting unit 301 is not covered by the pixel defining layer 40, so the edge of the first electrode 31 in the first light-emitting unit 301 is in an exposed state. In this case, the sagging high-precision metal mask 70 is easy to rub against the edge of the exposed first electrode 31, generate static electricity, etc., thereby causing the first light-emitting unit 301 to fail to emit light normally, and the display panel has problems such as dark spots. Therefore, on this basis, the embodiment of the present disclosure covers the first electrode 31 in the first light-emitting unit 301 by providing an isolation structure 80, which can avoid the edge of the first electrode 31 from being exposed, and further avoid the sagging high-precision metal mask 70 from rubbing against the edge of the first electrode 31, generating static electricity, etc., thereby ensuring the display effect of the display panel.

[0080] In other embodiments, the orthographic projections of the first electrode 31 in the light-emitting unit 30 emitting the first color light and the pixel defining layer 40 on the substrate 10 have a second overlapping area, and the orthographic projections of the first electrode 31 in the light-emitting unit 30 emitting the second color light and the pixel defining layer 40 on the substrate 10 have a third overlapping area, and the shapes of the second overlapping area and the third overlapping area are both annular, and the ring width of the second overlapping area is smaller than the ring width of the third overlapping area. Among them, the orthographic projections of the first electrode 31 in the light-emitting unit 30 emitting the first color light and the isolation structure 80 on the substrate 10 have a first overlapping area.

[0081] That is, the orthographic projections of the first electrode 31 in the first light-emitting unit 301 and the pixel defining layer 40 on the substrate 10 have a second overlapping area, and the orthographic projections of the first electrode 31 in the second light-emitting unit 302 and the pixel defining layer 40 on the substrate 10 have a third overlapping area, and the ring width of the second overlapping area is smaller than the ring width of the third overlapping area. Obviously, the pixel defining layer 40 covers a relatively small amount of the first electrode 31 in the first light-emitting unit 301. In this case, the orthographic projections of the first electrode 31 in the first light-emitting unit 301 and the isolation structure 80 on the substrate 10 have a first overlapping area.

[0082] Similarly, in the embodiment of the present disclosure, although the orthographic projection of the first electrode 31 in the first light-emitting unit 301 and the pixel defining layer 40 on the substrate 10 has a second overlapping area, the ring width of the second overlapping area is small, that is, although the pixel defining layer 40 covers the edge of the first electrode 31, the covering amount is small. In addition, in the direction close to the pixel opening, the thickness of the edge of the pixel defining layer 40 also gradually decreases. Therefore, in the case of less covering and a small thickness of the covered pixel defining layer 40, the sagging high-precision metal mask 70 may still rub against the edge of the exposed first electrode 31, generate static electricity, etc., thereby causing the first light-emitting unit 301 to be unable to emit light normally, and the display panel has problems such as dark spots. Therefore, on this basis, the embodiment of the present disclosure covers the first electrode 31 in the first light-emitting unit 301 by providing an isolation structure 80, which can avoid the edge of the first electrode 31 from being exposed, and further avoid the sagging high-precision metal mask 70 from rubbing against the edge of the first electrode 31, generating static electricity, etc., thereby ensuring the display effect of the display panel.

[0083] In some embodiments, Figure 5 As shown, the area of ​​the orthographic projection of the first electrode 31 in the light-emitting unit 30 emitting the first color light on the substrate 10 is smaller than the area of ​​the orthographic projection of the first electrode 31 in the light-emitting unit 30 emitting the second color light on the substrate 10. That is, the area of ​​the orthographic projection of the first electrode 31 in the first light-emitting unit 301 on the substrate 10 is smaller than the area of ​​the orthographic projection of the first electrode 31 in the second light-emitting unit 302 on the substrate 10.

[0084] It can also be understood that the area of ​​the orthographic projection of the first electrode 31 in the light-emitting unit 30 that emits green light on the substrate 10 is smaller than the area of ​​the orthographic projection of the first electrode 31 in the light-emitting unit 30 that emits red light on the substrate 10, and the area of ​​the orthographic projection of the first electrode 31 in the light-emitting unit 30 that emits green light on the substrate 10 is smaller than the area of ​​the orthographic projection of the first electrode 31 in the light-emitting unit 30 that emits blue light on the substrate 10.

[0085] In the embodiment of the present disclosure, the area of ​​the orthographic projection of the first electrode 31 in the first light-emitting unit 301 on the substrate 10 is smaller than the area of ​​the orthographic projection of the first electrode 31 in the second light-emitting unit 302 on the substrate 10. In this case, when forming the pixel defining layer 40, the pixel defining layer 40 is likely to not cover the edge of the first electrode 31 in the first light-emitting unit 301, or, even if the pixel defining layer 40 covers the edge of the first electrode 31 in the first light-emitting unit 301, the coverage of the first electrode 31 in the first light-emitting unit 301 by the pixel defining layer 40 is relatively small. Therefore, the first electrode 31 in the first light-emitting unit 301 may be scratched and static electricity may be generated with the sagging high-precision metal mask 70, thereby causing the first light-emitting unit 301 to fail to emit light normally and the display panel to have dark spots and other problems. On this basis, the embodiment of the present disclosure sets an isolation structure 80 to cover the first electrode 31 in the first light-emitting unit 301, which can avoid the edge of the first electrode 31 from being exposed, and further avoid the sagging high-precision metal mask 70 from scratching the edge of the first electrode 31 and generating static electricity, thereby ensuring the display effect of the display panel.

[0086] In some embodiments, the first color light includes green light, and the second color light includes at least one of blue light and red light. For example, the first light emitting unit 301 emits green light. The plurality of second light emitting units 302 include a plurality of second light emitting units 302 emitting blue light and a plurality of second light emitting units 302 emitting red light.

[0087] In the embodiment of the present disclosure, in the light-emitting unit 30 emitting green light, the first electrode 31 is not covered by the pixel defining layer 40 at all, or only a small part of the edge of the first electrode 31 is covered by the pixel defining layer 40, therefore, the phenomenon of scratching and generating static electricity between the high-precision metal mask 70 and the first electrode 31 often occurs in the light-emitting unit 30 emitting green light. Therefore, the embodiment of the present disclosure provides an isolation structure 80 to cover the first electrode 31 in the light-emitting unit 30 emitting green light, thereby preventing the first electrode 31 in the light-emitting unit 30 emitting green light from scratching and generating static electricity with the sagging high-precision metal mask 70, thereby ensuring the display effect of the display panel.

[0088] Figure 7 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure, Figure 8 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure, Fig. 9 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure, Fig.10 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure, Figures 7 to 10 All are along Figure 5 Schematic diagram of the cross-sectional structure cut along the middle cutting line XX'.

[0089] In some embodiments, Figures 7 to 10 As shown, the orthographic projection of the isolation structure 80 on the substrate 10 overlaps with the orthographic projection of the pixel defining layer 40 on the substrate 10. The surface of the pixel defining layer 40 away from the substrate 10 and the surface of the isolation structure 80 away from the substrate 10 have a boundary line.

[0090] Among them, the maximum distance from the surface of the pixel defining layer 40 away from the substrate 10 to the substrate 10 is a first distance D1, the maximum distance from the surface of the isolation structure 80 away from the substrate 10 to the substrate 10 is a second distance D2, and the maximum distance from the boundary line to the substrate 10 is a third distance D3, and the third distance D3 is smaller than at least one of the first distance D1 and the second distance D2.

[0091] Specifically, in Figure 7 In the illustrated embodiment, the third distance D3 is smaller than the first distance D1 , and the third distance D3 is equal to the second distance D2 .

[0092] exist Figure 8 In the illustrated embodiment, the third distance D3 is equal to the first distance D1, and the third distance D3 is smaller than the second distance D2.

[0093] exist Fig. 9 and Fig.10 In the illustrated embodiment, the third distance D3 is smaller than the first distance D1 , and the third distance D3 is smaller than the second distance D2 .

[0094] In the embodiment of the present disclosure, a portion of the isolation structure 80 covers the pixel defining layer 40, and a portion covers the first electrode 31, which can ensure that the edge of the first electrode 31 is not exposed. It can be understood that the thickness of the pixel defining layer 40 gradually decreases in the direction close to the pixel opening. Therefore, even if the pixel defining layer 40 can cover part of the first electrode 31, due to its relatively small thickness, its covering effect may be relatively poor. For example, it will still cause the first electrode 31 to rub against the sagging high-precision metal mask, generate electrostatic reactions, etc., resulting in the light-emitting unit 30 being unable to emit light, resulting in dark spots on the display panel and other problems. Therefore, in the embodiment of the present disclosure, a portion of the isolation structure 80 covers the pixel defining layer 40, and a portion covers the first electrode 31, which can also avoid the problem of dark spots on the display panel caused by the thin edge of the pixel defining layer 40 close to the pixel opening.

[0095] In some embodiments, Figures 7 to 10 As shown, the second distance D2 is not less than 2 / 3 of the first distance D1, and / or the third distance D3 is not less than 2 / 3 of the first distance D1. That is, at least one of the second distance D2 and the third distance D3 is not less than 2 / 3 of the first distance D1.

[0096] For example, the second distance D2 may be 2 / 3 of the first distance D1 , may be greater than 2 / 3 of the first distance D1 , may be equal to the first distance D1 , may be greater than the first distance D1 , and so on.

[0097] Similarly, the third distance D3 may be 2 / 3 of the first distance D1, may be greater than 2 / 3 of the first distance D1, may be equal to the first distance D1, may be greater than the first distance D1, and so on.

[0098] In the embodiment of the present disclosure, by setting at least one of the second distance D2 and the third distance D3 to be not less than 2 / 3 of the first distance D1, the drooping high-precision metal mask 70 can be supported by the isolation structure 80 or by the intersection of the isolation structure 80 and the pixel defining layer 40, so that the high-precision metal mask 70 maintains a set safety distance from the first electrode 31, avoiding scratches, static electricity and the like, thereby preventing the display effect of the display panel from being affected.

[0099] In some embodiments, Figure 8 As shown, the isolation structure 80 and the pixel defining layer 40 are connected to form an integrated structure.

[0100] In the embodiment of the present disclosure, the isolation structure 80 can be prepared simultaneously with the pixel defining layer 40, that is, the isolation structure 80 and the pixel defining layer 40 are made of the same material, and the isolation structure 80 can be formed simultaneously with the pixel defining layer 40 through the same preparation process, and there is no need to add an additional preparation process to form the isolation structure 80. Therefore, the embodiment of the present disclosure can simplify the preparation process of the overall display panel and reduce the preparation cost.

[0101] Fig.11 It is a schematic diagram of the cross-sectional structure of a display panel during the preparation process in some embodiments of the present disclosure.

[0102] In some embodiments, Fig.11 As shown, the display panel has a display area AA and a non-display area NA surrounding the display area AA.

[0103] The display panel further includes an isolation barrier 60 located in the non-display area NA and on one side of the substrate 10, and a spacer structure 50 located on the side of the pixel defining layer 40 away from the substrate 10. The isolation barrier 60 surrounds the display area AA and can prevent water vapor in the air from entering the display area AA. The orthographic projection of the spacer structure 50 on the substrate 10 overlaps with the orthographic projection of the pixel defining layer 40 on the substrate 10. For example, the orthographic projection of the spacer structure 50 on the substrate 10 is located within the orthographic projection range of the pixel defining layer 40 on the substrate 10. The orthographic projection of the first electrode 31 in the light-emitting unit 30 on the substrate 10 does not overlap with the orthographic projection of the spacer structure 50 on the substrate 10, and the orthographic projection of the spacer structure 50 on the substrate 10 is located between the orthographic projections of the first electrodes 31 in the plurality of light-emitting units 30 on the substrate 10. It can also be understood that the orthographic projection of the spacer structure 50 on the substrate 10 is surrounded by the orthographic projections of the plurality of first electrodes 31 on the substrate 10.

[0104] The maximum distance D4 between the surface of the isolation retaining wall 60 away from the substrate 10 and the substrate 10 is greater than the maximum distance D1 between the surface of the pixel defining layer 40 away from the substrate 10 and the substrate 10, and the maximum distance D5 between the surface of the spacer structure 50 away from the substrate 10 and the substrate 10 is greater than the maximum distance D1 between the surface of the pixel defining layer 40 away from the substrate 10 and the substrate 10. Therefore, the isolation retaining wall 60 and the spacer structure 50 can support the high-precision metal mask 70.

[0105] The isolation structure 80 and the spacer structure 50 are arranged on the same layer, and / or the isolation structure 80 and part of the isolation retaining wall 60 are arranged on the same layer. It should be noted that part of the isolation retaining wall 60 refers to a part of the isolation retaining wall 60 in the thickness direction of the display panel.

[0106] In the embodiment of the present disclosure, the isolation structure 80 can be prepared simultaneously with the spacer structure 50, that is, the isolation structure 80 and the spacer structure 50 are made of the same material, and the isolation structure 80 can be formed simultaneously with the spacer structure 50 through the same preparation process, and there is no need to add an additional preparation process to form the isolation structure 80. Therefore, the embodiment of the present disclosure can simplify the preparation process of the overall display panel and reduce the preparation cost.

[0107] In addition, in the embodiment of the present disclosure, the isolation structure 80 can also be arranged at the same layer as a part of the isolation retaining wall 60. Further, the isolation structure 80, the spacer structure 50 and a part of the isolation retaining wall 60 are arranged at the same layer.

[0108] Similarly, the embodiment of the present disclosure does not need to add any additional manufacturing process to form the isolation structure 80 . Therefore, the embodiment of the present disclosure can also simplify the manufacturing process of the entire display panel and reduce the manufacturing cost.

[0109] Optionally, in Fig.11In the illustrated embodiment, the isolation barrier 60 includes a first isolation portion 61 , a second isolation portion 62 , a third isolation portion 63 and a fourth isolation portion 64 which are sequentially stacked in a direction away from the substrate 10 .

[0110] The first isolation part 61 is disposed on the same layer as the driving circuit layer 20 , the second isolation part 62 is disposed on the same layer as the first electrode 31 , the third isolation part 63 is disposed on the same layer as the pixel defining layer 40 , and the fourth isolation part 63 is disposed on the same layer as the isolation structure 80 .

[0111] Obviously, further, the fourth isolation portion 63, the isolation structure 80 and the spacer structure 50 are arranged in the same layer.

[0112] Optionally, in Fig.11 In the illustrated embodiment, the isolation retaining wall 60 includes at least one isolation dam 601. Each isolation dam 601 surrounds the display area AA. When the isolation retaining wall 60 includes a plurality of isolation dams 601, isolation grooves are formed between adjacent isolation dams 601, and the isolation grooves may be filled with insulating materials to further improve the barrier effect of the isolation retaining wall 60.

[0113] In some embodiments, the light-emitting unit 30 includes a light-emitting device and a filter located on a side of the light-emitting device away from the substrate 10. The light-emitting device includes a first electrode 31, a light-emitting layer, and a second electrode. It can also be understood that the first electrode 31, the light-emitting layer, and the second electrode in the light-emitting unit 30 form a light-emitting device. The light that can be transmitted by the filter includes a first color light and a second color light.

[0114] For example, the plurality of filter sections include a plurality of first filter sections capable of transmitting a first color light and a plurality of second filter sections capable of transmitting a second color light, wherein the first filter section is located on a side of the light emitting device in the first light emitting unit away from the substrate, and the second filter section is located on a side of the light emitting device in the second light emitting unit away from the substrate.

[0115] Specifically, the first filter section can transmit green light. The plurality of second filter sections include a plurality of second filter sections that can transmit blue light and a plurality of second filter sections that can transmit red light.

[0116] The light emitting device is used to emit white light, or the light emitted by the light emitting device has the same color as the light that can be transmitted by the filter portion.

[0117] For example, in one example, all light emitting devices emit white light, and the filter section sets the positions of the first filter section, the second filter section capable of transmitting blue light, and the second filter section capable of transmitting red light according to actual needs.

[0118] For example, in another example, the plurality of light-emitting devices include a light-emitting device emitting green light, a light-emitting device emitting red light, and a light-emitting device emitting blue light. Accordingly, if the light-emitting device emits green light, the filter portion on the side of the light-emitting device away from the substrate 10 is the first filter portion. If the light-emitting device emits blue light, the filter portion on the side of the light-emitting device away from the substrate 10 is the second filter portion capable of transmitting blue light. If the light-emitting device emits red light, the filter portion on the side of the light-emitting device away from the substrate 10 is the second filter portion capable of transmitting red light.

[0119] In the disclosed embodiment, the high-precision metal mask 70 can deposit organic light-emitting materials that emit white light, and can also deposit organic light-emitting materials that emit red light, green light, and blue light in different pixel openings. The more times and the longer the high-precision metal mask 70 is used, the more serious the problems of the high-precision metal mask 70 rubbing against the first electrode 31 and generating static electricity mentioned above. Therefore, for such display panels, the size and thickness of the isolation structure 80 can be adjusted according to the characteristics of the display panel and the preparation process, thereby reducing the difficulty of the preparation process while ensuring the display effect of each display panel.

[0120] Fig.12 is a schematic diagram of the cross-sectional structure of a display panel in some other embodiments of the present disclosure, specifically along Figure 5 Schematic diagram of the cross-sectional structure cut along the middle cutting line XX'.

[0121] In some embodiments, Fig.12 As shown, the isolation structure 80 and the pixel defining layer 40 as a whole have a fourth overlapping area with the orthographic projection of the first electrode 31 on the substrate 10, and the ring width W1 of the fourth overlapping area is not less than 0.6μm. For example, the ring width W1 of the fourth overlapping area can be 0.6μm, 0.65μm, 0.7μm, 0.75μm, 0.8μm, 0.9μm, 1μm, etc.

[0122] Optionally, since it is uncertain whether the pixel defining layer 40 overlaps with the orthographic projection of the first electrode 31 on the substrate 10, that is, it is uncertain whether the pixel defining layer 40 has a covering effect on the edge of the first electrode 31, or there is a situation where the pixel defining layer 40 covers a small amount of the edge of the first electrode 31, therefore, Figure 7 As shown, in order to ensure the covering effect on the edge of the first electrode 31, the ring width W2 of the first overlapping area of ​​the isolation structure 80 and the positive projection of the first electrode 31 on the substrate 10 can be further made not less than 0.6μm. For example, the ring width W2 of the first overlapping area can be 0.6μm, 0.65μm, 0.7μm, 0.75μm, 0.8μm, 0.9μm, 1μm, etc.

[0123] In the embodiment of the present disclosure, the ring width of the fourth overlapping area of ​​the overall structure formed by the isolation structure 80 and the pixel defining layer 40 and the positive projection of the first electrode 31 on the substrate 10 is not less than 0.6μm, which can ensure that the overall structure formed by the isolation structure 80 and the pixel defining layer 40 sufficiently covers the edge of the first electrode 31, thereby ensuring that the drooping high-precision metal mask 70 will not be scratched against the edge of the first electrode 31, generate static electricity, and other problems, thereby ensuring the display effect of the display panel.

[0124] In some embodiments, the maximum distance D2 from the isolation structure 80 away from the surface of the substrate 10 to the light emitting layer is not less than 1.5 μm. For example, D2 may be 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, etc.

[0125] Since at least part of the isolation structure 80 is located within the pixel opening and has a first overlapping area with the orthographic projection of the first electrode 31 on the substrate 10, the embodiment of the present disclosure sets the minimum value of the maximum distance from the surface of the isolation structure 80 away from the substrate 10 to the light-emitting layer, so that the isolation structure 80 can support the drooping high-precision metal mask 70, thereby increasing the distance between the high-precision mask 70 and the first electrode 31, thereby avoiding scratches between the high-precision metal mask 70 and the first electrode 31, generating static electricity, etc., and ensuring the display effect of the display panel.

[0126] In some embodiments, Fig. 9 As shown, the isolation structure 80 includes a bottom surface 801 facing the substrate 10 and a second side surface 802 facing the pixel opening, and the angle between the bottom surface 801 and the second side surface 802 is not less than 20°, for example, the angle can be 20°, 25°, 30°, 35°, etc.

[0127] It should be noted that, since the second side surface 802 of the isolation structure 80 facing the pixel opening may be a curved surface in an actual product, at this time, Fig. 9 As shown, the included angle between the bottom surface 801 and the second side surface 802 refers to the included angle between the tangent line L at the intersection of the second side surface 802 and the bottom surface 801 and the bottom surface 801 .

[0128] In the embodiment of the present disclosure, the angle between the bottom surface 801 and the second side surface 802 of the isolation structure 80 is not less than 20°, which can prevent the thickness of the isolation structure 80 located on the side of the first electrode 31 away from the substrate 10 from being too small, thereby preventing the edge of the first electrode 31 from being insufficiently covered and causing problems such as dark spots on the display panel.

[0129] The present disclosure also provides a display device, comprising a display panel as described in any embodiment of the present disclosure.

[0130] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display panel, characterized in that: include: substrate; A plurality of light-emitting units, each of which comprises a first electrode and a light-emitting layer which are sequentially arranged in a direction away from the substrate; A pixel defining layer and at least one isolation structure, wherein the pixel defining layer is located on a side of the layer where the first electrode is located away from the substrate and has a plurality of pixel openings, wherein the pixel openings expose at least a portion of the first electrode; at least a portion of the light-emitting layer and at least a portion of the isolation structure are located in the pixel openings, the light-emitting layer is located on a side of the isolation structure away from the substrate, and an orthographic projection of the isolation structure on the substrate and an orthographic projection of the first electrode on the substrate have a first annular overlapping area.

2. The display panel according to claim 1, characterized in that: The light emitted by the plurality of light emitting units includes a first color light and a second color light; The first electrode in the light-emitting unit emitting the first color light has no overlap with the orthographic projection of the pixel defining layer on the substrate, and the first electrode in the light-emitting unit emitting the second color light has overlap with the orthographic projection of the pixel defining layer on the substrate; Alternatively, the first electrode in the light-emitting unit emitting the first color light has a second overlapping area with the orthographic projection of the pixel defining layer on the substrate, and the first electrode in the light-emitting unit emitting the second color light has a third overlapping area with the orthographic projection of the pixel defining layer on the substrate, and the second overlapping area and the third overlapping area are both annular in shape, and the ring width of the second overlapping area is smaller than the ring width of the third overlapping area; The orthographic projection of the first electrode in the light-emitting unit emitting the first color light and the isolation structure on the substrate has the first overlapping area.

3. The display panel according to claim 2, characterized in that: The area of ​​the orthographic projection of the first electrode in the light emitting unit emitting the first color light on the substrate is smaller than the area of ​​the orthographic projection of the first electrode in the light emitting unit emitting the second color light on the substrate.

4. The display panel according to claim 2, characterized in that: The first color light includes green light, and the second color light includes at least one of blue light and red light.

5. The display panel according to claim 1, characterized in that: The orthographic projection of the isolation structure on the substrate overlaps with the orthographic projection of the pixel defining layer on the substrate; A surface of the pixel defining layer away from the substrate and a surface of the isolation structure away from the substrate have a boundary line; The maximum distance from the surface of the pixel defining layer away from the substrate to the substrate is a first distance, the maximum distance from the surface of the isolation structure away from the substrate to the substrate is a second distance, and the maximum distance from the boundary line to the substrate is a third distance, wherein the third distance is less than at least one of the first distance and the second distance.

6. The display panel according to claim 5, characterized in that: The second distance is not less than 2 / 3 of the first distance, and / or the third distance is not less than 2 / 3 of the first distance.

7. The display panel according to any one of claims 1 to 6, characterized in that: The isolation structure and the pixel defining layer are connected to form an integrated structure.

8. The display panel according to any one of claims 1 to 6, characterized in that: The display panel has a display area and a non-display area surrounding the display area; The display panel further comprises an isolation barrier wall located in the non-display area and on one side of the substrate, and a spacer structure located on a side of the pixel defining layer away from the substrate, the isolation barrier wall surrounds the display area, an orthographic projection of the spacer structure on the substrate overlaps with an orthographic projection of the pixel defining layer on the substrate, and a maximum distance from a surface of the isolation barrier wall away from the substrate to the substrate and a maximum distance from a surface of the spacer structure away from the substrate to the substrate are both greater than a maximum distance from a surface of the pixel defining layer away from the substrate to the substrate; The isolation structure and the spacer structure are arranged on the same layer, and / or the isolation structure and part of the isolation retaining wall are arranged on the same layer.

9. The display panel according to any one of claims 1 to 6, characterized in that: The maximum distance from the isolation structure to the light-emitting layer away from the surface of the substrate is not less than 1.5 μm, and / or the isolation structure and the pixel defining layer as a whole have a fourth overlapping area with the orthographic projection of the first electrode on the substrate, and the ring width of the fourth overlapping area is not less than 0.6 μm.

10. The display panel according to claim 9, characterized in that: The isolation structure includes a bottom surface facing the substrate and a side surface facing the pixel opening, and an angle between the bottom surface and the side surface is not less than 20°.

11. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 10.

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