Display panel and display device

Abstract

The application discloses a display panel and a display device. The display panel comprises a substrate, a plurality of first electrodes, a pixel definition layer, a first film layer, a light-emitting layer and a second electrode. The plurality of first electrodes are arranged on one side of the substrate. The pixel definition layer is arranged on one side of the substrate and covers the plurality of first electrodes. The pixel definition layer is provided with a plurality of pixel openings, and the pixel openings expose the first electrodes. The first film layer is arranged on the side, away from the substrate, of the pixel definition layer and is located between two adjacent pixel openings. The first film layer is provided with a recess. The light-emitting layer comprises a first light-emitting part and a second light-emitting part connected with each other. The first light-emitting part is arranged in the pixel opening and is located on the side, away from the substrate, of the first electrode. The second light-emitting part is arranged on the side, away from the substrate, of the first film layer and covers at least part of the recess. The second electrode covers the side, away from the substrate, of the light-emitting layer. The application reduces the leakage current between adjacent sub-pixels, and reduces the influence of the light stealing phenomenon on the display picture of a low gray scale.

Description

Technical Field

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

[0002] In organic light-emitting diode (OLED) display panels, the light-emitting layer of each sub-pixel is formed by vapor deposition. During actual production, it has been found that during the vapor deposition process, the light-emitting layers of adjacent sub-pixels can easily overlap, forming leakage paths and leading to a phenomenon called "smoke and shine" (smoke and shine). This problem causes adjacent pixels in a monochrome display to light up simultaneously. This problem is particularly serious in low-grayscale displays.

[0003] Therefore, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present application is to provide a display panel and a display device, which can reduce the influence of the stealth phenomenon on low-grayscale display images by reducing the leakage current between adjacent sub-pixels.

[0005] To solve the above problems, the technical solutions of this application are as follows:

[0006] In a first aspect, the present application proposes a display panel, comprising:

[0007] substrate;

[0008] a plurality of first electrodes, disposed on one side of the substrate;

[0009] a pixel definition layer, disposed on one side of the substrate and covering the plurality of first electrodes, wherein the pixel definition layer is provided with a plurality of pixel openings, each of the pixel openings exposing one of the first electrodes;

[0010] a first film layer, disposed on a side of the pixel definition layer away from the substrate and located between two adjacent pixel openings, wherein a recessed portion is provided on the side of the first film layer away from the pixel definition layer;

[0011] a light-emitting layer comprising a first light-emitting portion and a second light-emitting portion connected to each other, wherein the first light-emitting portion is disposed within the pixel opening and on a side of the first electrode away from the substrate, and the second light-emitting portion is disposed on a side of the first film layer away from the substrate and covers at least a portion of the recessed portion; and

[0012] The second electrode covers a side of the light-emitting layer away from the substrate.

[0013] In one embodiment of the present application, the depth of the recessed portion is less than the thickness of the first film layer, and the angle between the sidewall of the recessed portion and the bottom wall of the recessed portion is in a range of 90 degrees to 160 degrees;

[0014] The second light-emitting portion continuously covers at least a portion of the recessed portion, the first portion of the second light-emitting portion is arranged on the side wall of the recessed portion, the second portion of the second light-emitting portion is arranged on the bottom wall of the recessed portion, and the thickness of the first portion of the second light-emitting portion is less than the thickness of the second portion of the second light-emitting portion.

[0015] In one embodiment of the present application, the depth of the recessed portion is equal to the thickness of the first film layer, the recessed portion exposes a portion of the pixel definition layer, and an angle between a sidewall of the recessed portion and a plane where the portion of the pixel definition layer exposed in the recessed portion lies is in a range of 90 degrees to 160 degrees.

[0016] The second light-emitting portion continuously covers at least a portion of the recessed portion, the first portion of the second light-emitting portion is arranged on the side wall of the recessed portion, the second portion of the second light-emitting portion is arranged on the portion of the pixel definition layer exposed to the recessed portion, and the thickness of the first portion of the second light-emitting portion is less than the thickness of the second portion of the second light-emitting portion.

[0017] In one embodiment of the present application, the first film layer includes a first sub-portion and a second sub-portion spaced apart along the extending direction of two adjacent pixel openings, and a recessed portion is formed between the first sub-portion and the second sub-portion;

[0018] The second light emitting portion includes:

[0019] a first subsegment, disposed on a side of the first sub-portion away from the pixel definition layer and located outside the recessed portion;

[0020] a second subsection, provided on a side of the first subsection close to the second subsection;

[0021] a third subsection, provided at a portion of the pixel definition layer exposed to the recessed portion and located between the first subsection and the second subsection;

[0022] a fourth subsection, provided on a side of the second subsection close to the first subsection; and

[0023] a fifth subsegment, provided on a side of the second sub-portion away from the pixel definition layer and located outside the recessed portion;

[0024] The first sub-segment, the second sub-segment, the third sub-segment, the fourth sub-segment, and the fifth sub-segment are connected in sequence;

[0025] The thickness of any one of the second subsegment and the fourth subsegment is smaller than the thickness of any one of the first subsegment, the third subsegment, and the fifth subsegment.

[0026] In one embodiment of the present application, at least two of the recessed portions are located between two adjacent pixel openings, and at least two of the recessed portions are spaced apart along an extension direction of the two adjacent pixel openings.

[0027] In one embodiment of the present application, the first film layer further includes a third sub-portion, the third sub-portion being spaced apart and disposed on a side of the second sub-portion away from the first sub-portion, with a recess being formed between the third sub-portion and the second sub-portion;

[0028] The second light emitting unit further includes:

[0029] a sixth subsection, provided on a side of the second subsection close to the third subsection;

[0030] a seventh subsection, provided at a portion of the pixel definition layer exposed to the recessed portion and located between the second subsection and the third subsection;

[0031] an eighth subsection, provided on a side of the third subsection close to the second subsection; and

[0032] a ninth subsegment, disposed on a side of the third sub-portion away from the pixel definition layer and located outside the recessed portion;

[0033] The first subsection, the second subsection, the third subsection, the fourth subsection, the fifth subsection, the sixth subsection, the seventh subsection, the eighth subsection, and the ninth subsection are connected in sequence;

[0034] The thickness of any one of the second subsegment, the fourth subsegment, the sixth subsegment, and the eighth subsegment is smaller than the thickness of any one of the first subsegment, the third subsegment, the fifth subsegment, the seventh subsegment, and the ninth subsegment.

[0035] In one embodiment of the present application, the thickness of the first sub-portion is greater than or equal to 0.2 microns, the thickness of the second sub-portion is greater than or equal to 0.2 microns, and the thickness of the third sub-portion is greater than or equal to 0.2 microns.

[0036] In one embodiment of the present application, an included angle between a side wall of the recess and a bottom wall of the recess is in a range of 60 degrees to 80 degrees, and the second light-emitting portion is separated at the recess.

[0037] In one embodiment of the present application, the light-emitting layer includes:

[0038] The first sub-light emitting layer comprises a first sub-light emitting part and a second sub-light emitting part connected to each other, the first sub-light emitting part is arranged in the pixel opening and located on the side of the first electrode away from the substrate, and the second sub-light emitting part is arranged on the side of the first film layer away from the substrate and covers at least part of the recess;

[0039] The second sub-light emitting layer comprises a third sub-light emitting part and a fourth sub-light emitting part connected to each other, the third sub-light emitting part is arranged in the pixel opening and located on the side of the first sub-light emitting part away from the substrate, and the fourth sub-light emitting part is arranged on the side of the second sub-light emitting part away from the substrate and covers at least part of the recess;

[0040] The charge generation layer is arranged between the first sub-light emitting layer and the second sub-light emitting layer.

[0041] The first sub-light emitting part and the third sub-light emitting part form the first light emitting part, and the second sub-light emitting part and the fourth sub-light emitting part form the second light emitting part.

[0042] In an embodiment of the present application, the display panel further comprises a second film layer, the second film layer is located between the side wall of the pixel opening and the first light emitting part, and the second film layer is connected to the first film layer.

[0043] The refractive index of the material of the second film layer is greater than the refractive index of the material of the pixel definition layer.

[0044] In an embodiment of the present application, the second film layer is arranged around the side wall of the pixel opening, the included angle between the side wall of the pixel opening and the plane where the substrate is located is within the range of 10 degrees to 30 degrees, and the difference between the refractive index of the material of the second film layer and the refractive index of the material of the pixel definition layer is greater than 0.1.

[0045] In the second aspect, the present application proposes a display device, including a display panel, the display panel including a substrate, multiple first electrodes, a pixel definition layer, a first film layer, a light-emitting layer and a second electrode, the multiple first electrodes are arranged on one side of the substrate; the pixel definition layer is arranged on one side of the substrate and covers the multiple first electrodes, the pixel definition layer is provided with multiple pixel openings, each of the pixel openings exposes one first electrode; the first film layer is arranged on the side of the pixel definition layer away from the substrate and is located between two adjacent pixel openings, and the side of the first film layer away from the pixel definition layer is provided with a recessed portion; the light-emitting layer includes a first light-emitting portion and a second light-emitting portion connected to each other, the first light-emitting portion is arranged in the pixel opening and is located on the side of the first electrode away from the substrate, the second light-emitting portion is arranged on the side of the first film layer away from the substrate and covers at least a part of the recessed portion; the second electrode covers the side of the light-emitting layer away from the substrate.

[0046] In the present application, the light-emitting layer formed by vapor deposition in each subpixel includes a first light-emitting portion and a second light-emitting portion. The first light-emitting portion is formed within the pixel opening, while the second light-emitting portion is formed outside the pixel opening and connected to the first light-emitting portion. In actual production, due to the limited process precision of display panels, the second light-emitting portions corresponding to two adjacent subpixels with a small spacing may overlap or connect due to the influence of the display panel process precision. When the second light-emitting portions of the two subpixels overlap or connect, a leakage path is formed. When one subpixel is illuminated, carriers are transferred to the adjacent subpixel through the leakage path formed by the overlapping second light-emitting portion, causing the adjacent subpixel to be illuminated. In the present application, a first film layer is provided between the openings of two adjacent pixels, and a recessed portion is provided in the first film layer, so that the second light-emitting portion at least partially covers the recessed portion. This extends the leakage path between the two adjacent subpixels and reduces leakage current between the two adjacent subpixels. Due to the reduced leakage current, the brightness of the adjacent subpixel after being illuminated also decreases, thereby reducing the impact of the "stealth" phenomenon on low-grayscale displays. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of a first embodiment of a display panel of the present application;

[0048] Figure 2 is a schematic diagram of a first embodiment of a display panel of the present application;

[0049] Figure 3 is a schematic diagram of a first embodiment of a display panel of the present application;

[0050] Figure 4 is a schematic diagram of a first embodiment of a display panel of the present application;

[0051] Figure 5 is a schematic diagram of a first embodiment of a display panel of the present application;

[0052] Figure 6 is a schematic diagram of a second embodiment of a display panel of the present application;

[0053] Figure 7 yes Figure 6 The enlarged view of point B in FIG.

[0054] Figure 8 is a schematic diagram of a second embodiment of a display panel of the present application;

[0055] Figure 9 is a schematic diagram of a third embodiment of the display panel of the present application;

[0056] Figure 10 is a schematic diagram of a third embodiment of the display panel of the present application;

[0057] Figure 11 This is a schematic diagram of the fourth embodiment of the display panel of the present application. DETAILED DESCRIPTION

[0058] The meanings of the terms used in this specification and claims correspond to those commonly understood by persons of ordinary skill in the art to which this application belongs. The terms used in this specification and claims are intended solely to facilitate the description and understanding of this application and are not intended to limit this application to the narrow interpretations of the specific terms used in the specification and claims.

[0059] This application proposes a display device, which can be a mobile phone, tablet computer, e-reader, electronic display screen, laptop computer, mobile phone, augmented reality (AR) or virtual reality (VR) device, media player, wearable device, digital camera, car navigation system, etc. The display device includes a display panel 1000.

[0060] The present application proposes a display panel 1000 , which may be an organic light emitting diode (OLED) display panel 1000 .

[0061] Optionally, the display panel 1000 includes a substrate 10 , a plurality of first electrodes 50 , a pixel definition layer 30 , a first film layer 40 , a light emitting layer 60 and a second electrode 70 .

[0062] Optionally, the plurality of first electrodes 50 are disposed on one side of the substrate 10. The pixel definition layer 30 is disposed on one side of the substrate 10 and covers the plurality of first electrodes 50. The pixel definition layer 30 is provided with a plurality of pixel openings 31, each of which exposes one first electrode 50.

[0063] Optionally, the first film layer 40 is disposed on the side of the pixel definition layer 30 away from the substrate 10 and between two adjacent pixel openings 31. The first film layer 40 is provided with a recess 41 on the side away from the pixel definition layer 30.

[0064] Optionally, the light-emitting layer 60 comprises a first light-emitting portion 61 and a second light-emitting portion 62 connected to each other. The first light-emitting portion 61 is disposed in the pixel opening 31 and on the side of the first electrode 50 away from the substrate 10. The second light-emitting portion 62 is disposed on the side of the first film layer 40 away from the substrate 10 and covers at least part of the recess 41. The second electrode 70 covers the side of the light-emitting layer 60 away from the substrate 10.

[0065] In the present application, the light-emitting layer 60 formed by evaporation in each sub-pixel comprises a first light-emitting portion 61 and a second light-emitting portion 62. The first light-emitting portion 61 is formed in the pixel opening 31, and the second light-emitting portion 62 is formed outside the pixel opening 31 and connected to the first light-emitting portion 61. In actual production, due to the limited process precision of the display panel 1000, in two adjacent sub-pixels with small spacing, the second light-emitting portions 62 corresponding to the two sub-pixels will be connected due to the process precision of the display panel 1000. After the second light-emitting portions 62 of the two sub-pixels are connected, a leakage path is formed. When one sub-pixel is lit, the carriers will be transmitted to the adjacent sub-pixel through the leakage path formed by the connected second light-emitting portions 62, so that the adjacent sub-pixel is also lit. In the present application, the first film layer 40 is disposed between the two adjacent pixel openings 31, and the recess 41 is disposed on the first film layer 40, so that the second light-emitting portion 62 covers at least part of the recess 41, thereby prolonging the leakage path between the two adjacent sub-pixels and reducing the leakage current between the two adjacent sub-pixels. Due to the reduction of the leakage current, the brightness of the adjacent sub-pixel after being lit is also reduced, thereby reducing the influence of the light stealing phenomenon on the display picture of low gray scale.

[0066] Optionally, each pixel opening 31 corresponds to a first light-emitting portion 61 and a second light-emitting portion 62 connected to the first light-emitting portion 61. The first light-emitting portion 61 and the second light-emitting portion 62 corresponding to each pixel opening 31 have the same light-emitting color. In the process of forming the light-emitting layer 60, the first light-emitting portion 61 and the second light-emitting portion 62 are formed simultaneously. The first light-emitting portion 61 is the part of the light-emitting layer 60 formed in the pixel opening 31 in the evaporation process, and the second light-emitting portion 62 is the part of the light-emitting layer 60 formed outside the pixel opening 31 in the evaporation process.

[0067] Optionally, the display panel 1000 of the present application further includes a plurality of light emitting devices, one of which is disposed in each pixel opening 31. The light emitting device includes a first electrode 50, a first light emitting portion 61, and a portion of the second electrode 70 located in the pixel opening 31.

[0068] Optionally, the light-emitting devices include a blue light-emitting device, a red light-emitting device 91, and a green light-emitting device 92. Due to the low luminous efficiency of the blue light-emitting device, the blue light-emitting device is relatively large, and the spacing between the blue light-emitting device and adjacent light-emitting devices is also large. Therefore, the second light-emitting portion 62 of the blue light-emitting device is not easily overlapped or connected with the second light-emitting portion 62 of the adjacent light-emitting device. The green light-emitting device 92 and the red light-emitting device 91 have higher luminous efficiency than the blue light-emitting device. Therefore, the green light-emitting device 92 and the red light-emitting device 91 are relatively small, and the spacing between the green light-emitting device 92 and the red light-emitting device 91 and adjacent light-emitting devices is also small. Therefore, the second light-emitting portion 62 of the green light-emitting device 92 and the red light-emitting device 91 is easily overlapped or connected with the second light-emitting portion 62 of the adjacent light-emitting device, thereby forming a leakage path.

[0069] Optional, see Figure 1 The red light emitting device 91 is adjacent to the green light emitting device 92 , and the second light emitting portion 62 of the red light emitting device 91 is connected to the second light emitting portion 62 of the green light emitting device 92 .

[0070] Optional, see Figure 2 The red light emitting device 91 and the green light emitting device 92 are arranged adjacent to each other, and the second light emitting portion 62 of the red light emitting device 91 is overlapped above the second light emitting portion 62 of the green light emitting device 92 .

[0071] Optional, see Figure 3 The red light emitting device 91 and the green light emitting device 92 are arranged adjacent to each other, and the second light emitting portion 62 of the green light emitting device 92 is overlapped above the second light emitting portion 62 of the red light emitting device 91 .

[0072] In the above three embodiments, a leakage path is formed between the red light emitting device 91 and the green light emitting device 92. The present application extends the leakage path and reduces the leakage current through the design of the recessed portion 41. The brightness of the adjacent sub-pixels after being illuminated is also reduced, thereby reducing the impact of the stealing phenomenon on the low grayscale display screen.

[0073] To avoid redundancy, an embodiment in which the second light-emitting portions 62 of two adjacent light-emitting devices are connected will be described later. The light-emitting colors of the two adjacent light-emitting devices may be the same or different, and the subsequent embodiments will not limit this.

[0074] Optionally, the first electrode 50 is an anode and the second electrode 70 is a cathode. The second electrode 70 is formed by continuously laying the entire surface.

[0075] Optionally, the display panel 1000 further includes a drive circuit layer 20. The drive circuit layer 20 is disposed on one side of the substrate 10, and the first electrode 50 and the pixel definition layer 30 are disposed on the side of the drive circuit layer 20 away from the substrate 10. The drive circuit layer 20 includes multiple thin-film transistors and a planarization layer. The multiple thin-film transistors are disposed on one side of the substrate 10, and the planarization layer covers the multiple thin-film transistors. The first electrode 50 passes through the planarization layer and is electrically connected to the thin-film transistors.

[0076] Optional, see Figure 4 The light-emitting layer 60 includes a first sub-light-emitting layer 63, a second sub-light-emitting layer 64, and a charge generation layer. The first sub-light-emitting layer 63 includes a first sub-light-emitting portion 63a and a second sub-light-emitting portion 63b connected to each other. The first sub-light-emitting portion 63a is located within the pixel opening 31 and on the side of the first electrode 50 away from the substrate 10. The second sub-light-emitting portion 63b is located on the side of the first film layer 40 away from the substrate 10 and covers at least a portion of the recessed portion 41. The second sub-light-emitting layer 64 includes a third sub-light-emitting portion 64a and a fourth sub-light-emitting portion 64b connected to each other. The third sub-light-emitting portion 64a is located within the pixel opening 31 and on the side of the first sub-light-emitting portion 63a away from the substrate 10. The fourth sub-light-emitting portion 64b is located on the side of the second sub-light-emitting portion 63b away from the substrate 10 and covers at least a portion of the recessed portion 41. The charge generation layer is located between the first sub-light-emitting layer 63 and the second sub-light-emitting layer 64. The first sub-light-emitting portion 63a and the third sub-light-emitting portion 64a form the first light-emitting portion 61. The second sub-light emitting portion 63 b and the fourth sub-light emitting portion 64 b form a second light emitting portion 62 .

[0077] To improve the luminous efficiency of the light-emitting device, the light-emitting device of the present application is a stacked light-emitting device comprising multiple light-emitting layers 60. Each light-emitting layer 60 of the stacked light-emitting device includes at least two or more film layers. When the stacked light-emitting device comprises two light-emitting layers 60, the first light-emitting layer 60 is a first sub-light-emitting layer 63, and the second light-emitting layer 60 is a second sub-light-emitting layer 64. The portion of the first sub-light-emitting layer 63 located outside the pixel opening 31 is a second sub-light-emitting portion 63b, and the portion of the second sub-light-emitting layer 64 located outside the pixel opening 31 is a fourth sub-light-emitting portion 64b. The second sub-light-emitting portion 63b and the fourth sub-light-emitting portion 64b form a second light-emitting portion 62. Because the second sub-light-emitting portion 63b and the fourth sub-light-emitting portion 64b located outside the pixel opening 31 both cover the recessed portion 41, when adjacent stacked light-emitting devices are connected or overlapped, the leakage path between the adjacent stacked light-emitting devices can be extended, reducing leakage current. Consequently, the brightness of the adjacent sub-pixel after being illuminated is reduced, thereby reducing the impact of the "stealth" phenomenon on low-grayscale display images.

[0078] In the present application, the light-emitting device may have a structure of a single light-emitting layer 60 or a stacked structure of multiple light-emitting layers 60. To avoid redundancy, the following description will describe embodiments in which all light-emitting devices have a single light-emitting layer 60. The light-emitting device may have a single light-emitting layer 60 or multiple light-emitting layers 60, and the subsequent embodiments will not limit this.

[0079] Optional, see Figure 3 The display panel 1000 further includes a second film layer 80. The second film layer 80 is located between the sidewall of the pixel opening 31 and the first light-emitting portion 61, and is connected to the first film layer 40. The refractive index of the material of the second film layer 80 is greater than the refractive index of the material of the pixel definition layer 30.

[0080] The second film layer 80 is made of a transparent material with a higher refractive index than the pixel definition layer 30. Since the refractive index of the second film layer 80 is greater than that of the pixel definition layer 30, light emitted by the light-emitting device is totally reflected at the interface between the second film layer 80 and the pixel definition layer 30, thereby improving the light extraction efficiency from the front.

[0081] Optionally, the difference between the refractive index of the material of the second film layer 80 and the refractive index of the material of the pixel definition layer 30 is greater than 0.1.

[0082] The difference between the refractive index of the material of the second film layer 80 and the refractive index of the material of the pixel definition layer 30 is one of 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, and 0.50. As the difference increases, the light emitted by the light emitting device is more likely to be totally reflected at the interface, thereby further improving the luminous efficiency.

[0083] Optionally, the material of the pixel definition layer 30 is at least one of silicon oxide, silicon nitride and silicon oxynitride.

[0084] Optionally, the material of the second film layer 80 includes an organic material doped with nanoparticles.

[0085] The nanoparticles can be titanium oxide or zirconium oxide particles with a particle size greater than 100 nanometers. The organic material can be acrylic, resin, or high-viscosity organic ink. Because a portion of the second film layer 80 covers the corner portion of the pixel definition layer 30, to avoid stress concentration and damage at the corner of the pixel definition layer 30, the second film layer 80 must have a certain degree of deformation ability. Therefore, doping the organic material with nanoparticles can improve the deformation ability of the second film layer 80 and prevent damage due to stress concentration.

[0086] Optionally, the material of the second film layer 80 is an organic-inorganic hybrid material.

[0087] The organic-inorganic hybrid material may be metalloxane.

[0088] Optionally, the material of the first film layer 40 is the same as that of the second film layer 80, and the first film layer 40 and the second film layer 80 are integrally formed. Since both the first film layer 40 and the second film layer 80 require patterning during the manufacturing process of the display panel 1000, the integral formation of the first film layer 40 and the second film layer 80 can save a process step and a photomask, thereby reducing the production cost of the display panel 1000.

[0089] Optionally, the interface shape between the first film layer 40 and the second film layer 80 may be one of an L-shape, an arc shape, and a rounded corner.

[0090] Optionally, the second film layer 80 is disposed around the sidewall of the pixel opening 31. The angle formed by the sidewall of the pixel opening 31 and the plane where the substrate 10 is located is in the range of 10 degrees to 30 degrees.

[0091] The second film layer 80 is disposed around the sidewalls of the pixel opening 31 and forms a light extraction structure with the first electrode 50. The first electrode 50 is typically a metal electrode with high reflectivity. Light emitted from the light-emitting layer 60 toward the light extraction structure is reflected toward the front, thereby improving the front light extraction efficiency of the display panel 1000.

[0092] In the first embodiment of the present application:

[0093] Optional, see Figure 5 The included angle A1 between the side wall of the recessed portion 41 and the bottom wall of the recessed portion 41 is in the range of 90 degrees to 160 degrees, and the depth of the recessed portion 41 is less than the thickness of the first film layer 40 .

[0094] An included angle A1 between the side wall of the recess 41 and the bottom wall of the recess 41 is one of 90 degrees, 95 degrees, 100 degrees, 105 degrees, 110 degrees, 115 degrees, 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, 155 degrees, and 160 degrees.

[0095] Optionally, the second light-emitting portion 62 continuously covers at least a portion of the recessed portion 41, the first portion of the second light-emitting portion 62 is arranged on the side wall of the recessed portion 41, the second portion of the second light-emitting portion 62 is arranged on the bottom wall of the recessed portion 41, and the thickness of the first portion of the second light-emitting portion 62 is less than the thickness of the second portion of the second light-emitting portion 62.

[0096] Between two adjacent light-emitting devices, a leakage path is formed by the connected or overlapping second light-emitting portion 62. Therefore, according to the basic principle of resistance, the resistance of the second light-emitting portion 62 is inversely proportional to the thickness of the second light-emitting portion 62. The first part of the second light-emitting portion 62 is provided on the side wall of the recessed portion 41, and the second part of the second light-emitting portion 62 is provided on the bottom wall of the recessed portion 41, and the thickness of the first part of the second light-emitting portion 62 is less than the thickness of the second part of the second light-emitting portion 62. Since the first part of the second light-emitting portion 62 and the second part of the second light-emitting portion 62 form a leakage path between two adjacent light-emitting devices, the resistance of the leakage path mainly depends on the part with the larger resistance in the leakage path. According to the basic principle of resistance, in a film layer formed of the same material, the smaller the thickness of the part, the greater the resistance, and the thicker the part, the smaller the resistance. Since the first portion of the second light-emitting portion 62 is arranged on the side wall of the recessed portion 41 and the thickness of the first portion of the second light-emitting portion 62 is relatively small, the resistance of the leakage path between two adjacent light-emitting devices can be increased, thereby reducing the leakage current between the two adjacent light-emitting devices. The brightness of the adjacent sub-pixels after being illuminated is also reduced, thereby reducing the impact of the stealth phenomenon on the low-grayscale display screen.

[0097] In the second embodiment of the present application:

[0098] Optional, see Figure 6 The angle A2 between the side wall of the recessed portion 41 and the portion of the pixel definition layer 30 exposed in the recessed portion 41 is in the range of 90 degrees to 160 degrees, the depth of the recessed portion 41 is equal to the thickness of the first film layer 40, and the recessed portion 41 exposes a portion of the pixel definition layer 30.

[0099] An angle A2 between the sidewall of the recess 41 and the portion of the pixel definition layer 30 exposed in the recess 41 is one of 90 degrees, 95 degrees, 100 degrees, 105 degrees, 110 degrees, 115 degrees, 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, 155 degrees, and 160 degrees.

[0100] Optionally, the second light-emitting portion 62 continuously covers at least a portion of the recessed portion 41, the first portion of the second light-emitting portion 62 is arranged on the side wall of the recessed portion 41, and the second portion of the second light-emitting portion 62 is arranged on the portion of the pixel definition layer 30 exposed to the recessed portion 41, and the thickness of the first portion of the second light-emitting portion 62 is less than the thickness of the second portion of the second light-emitting portion 62.

[0101] In the present application, the light emitting layer 60 is formed by evaporation, wherein the second light emitting portion 62 is formed on the first film layer 40 by evaporation.

[0102] See also Figure 7 , Figure 7 The hypotenuse in FIG is a simplified schematic diagram of the side wall of the recessed portion 41. Figure 7 The plane connected to the hypotenuse is a simplified schematic diagram of the portion of the pixel definition layer 30 exposed in the recessed portion 41. According to the principles of evaporation deposition, for a deposition topography consisting of a single hypotenuse and a single straight edge, the projected length of the hypotenuse on substrate 10 is set to b, the projected length of the straight edge on substrate 10 is set to b, the thickness of the second portion of the second light-emitting portion 62 is set to H1, and the thickness of the first portion of the second light-emitting portion 62 is set to H2.

[0103] According to the deposition principle of the light-emitting layer 60, the volume of the light-emitting layer 60 deposited with the same projected area is the same. This yields the following relationship: H2*b=H1*c, where c is the length of the hypotenuse. Since the projected length of the hypotenuse on the substrate 10 is b, c is greater than b. Therefore, according to this equation, the thickness H1 of the second portion of the second light-emitting portion 62 is less than the thickness H2 of the first portion of the second light-emitting portion 62.

[0104] Because the leakage path is formed by the second light-emitting portion 62 between two adjacent light-emitting devices, the resistance of the leakage path is determined by the relatively thin portion of the second light-emitting portion 62. In this embodiment, by providing the recessed portion 41, the thickness of the second light-emitting portion 62, which is deposited on the sidewalls of the recessed portion 41, is reduced compared to the thickness of the other portions of the second light-emitting portion 62. This increases the overall resistance of the second light-emitting portion 62 and reduces leakage current between two adjacent overlapping or connected light-emitting devices. Consequently, the brightness of adjacent sub-pixels after being illuminated is also reduced, thereby reducing the impact of the "stealth" phenomenon on low-grayscale displays.

[0105] Optionally, the first film layer 40 includes a first sub-portion 42 and a second sub-portion 43 spaced apart along the extending direction of two adjacent pixel openings 31 , and a recessed portion 41 is formed between the first sub-portion 42 and the second sub-portion 43 .

[0106] Optional, see Figure 8 The second light-emitting portion 62 includes a first sub-segment 62a, a second sub-segment 62b, a third sub-segment 62c, a fourth sub-segment 62d and a fifth sub-segment 62e which are connected in sequence.

[0107] Optionally, the first subsegment 62a is provided on a side of the first subsection 42 away from the pixel definition layer 30 and is located outside the recessed portion 41. The second subsegment 62b is provided on a side of the first subsection 42 close to the second subsection 43. The third subsegment 62c is provided on a portion of the pixel definition layer 30 exposed to the recessed portion 41 and is located between the first subsection 42 and the second subsection 43. The fourth subsegment 62d is provided on a side of the second subsection 43 close to the first subsection 42. The fifth subsegment 62e is provided on a side of the second subsection 43 away from the pixel definition layer 30 and is located outside the recessed portion 41.

[0108] Optionally, the thickness of any one of the second sub-segment 62b and the fourth sub-segment 62d is smaller than the thickness of any one of the first sub-segment 62a, the third sub-segment 62c, and the fifth sub-segment 62e.

[0109] In this embodiment, the second light-emitting portion 62 of one of the two adjacent light-emitting devices covers the entire recessed portion 41. In this embodiment, because the second subsegment 62b covers the side surfaces of the first subsegment 42 and the fourth subsegment 62d covers the side surfaces of the second subsegment 43, the side surfaces of the first subsegment 42 and the second subsegment 43 intersect with the plane of the substrate 10. Therefore, the thickness of each of the second and fourth subsegments 62b and 62d is less than the thickness of each of the first, third, and fifth subsegments 62a, 62c, and 62e. In this embodiment, the resistance of the leakage path is determined by the thinner portion of the second light-emitting portion 62. The relatively thin second and fourth subsegments 62b and 62d increase the resistance of the leakage path, thereby reducing leakage current between two adjacent overlapping or connected light-emitting devices. Consequently, the brightness of adjacent sub-pixels after being illuminated is reduced, thereby reducing the impact of the "stealth" phenomenon on low-grayscale display images.

[0110] Optionally, the thickness of the first sub-portion 42 is greater than or equal to 0.2 micrometers. The thickness of the second sub-portion 43 is greater than or equal to 0.2 micrometers.

[0111] The thickness of the first sub-portion 42 may be equal to or different from the thickness of the second sub-portion 43. The thickness of the first sub-portion 42 is selected from the group consisting of 0.2 micrometers, 0.3 micrometers, 0.4 micrometers, 0.5 micrometers, 0.6 micrometers, 0.7 micrometers, and 0.8 micrometers. The thickness of the second sub-portion 43 is selected from the group consisting of 0.2 micrometers, 0.3 micrometers, 0.4 micrometers, 0.5 micrometers, 0.6 micrometers, 0.7 micrometers, and 0.8 micrometers.

[0112] Please refer again Figure 7According to the deposition principle of the light-emitting layer 60, the volume of the light-emitting layer 60 deposited with the same projected area is the same. This yields the following equation: H2*b=H1*c, where c is the length of the hypotenuse. Since the projected length of the hypotenuse on the substrate 10 is b, c is greater than b. Therefore, according to this equation, the thickness H1 of the second portion of the second light-emitting portion 62 is less than the thickness H2 of the first portion of the second light-emitting portion 62.

[0113] In order to verify the effects of the thickness of the first film layer 40 and the angle A2 formed between the sidewall of the recessed portion 41 and the upper surface of the pixel definition layer 30 on the resistance of the second light-emitting portion 62, this application sets up a control group and multiple experimental groups to verify the increase in resistance. The increase in resistance can be understood as (the difference between the resistance of the second light-emitting portion 62 in the experimental group and the resistance of the second light-emitting portion 62 in the control group) / the resistance of the second light-emitting portion 62 in the experimental group.

[0114] The structure of the control group is as follows: the first film layer 40 is not disposed between two adjacent pixel openings 31 , and the second light-emitting portion 62 is disposed on the pixel definition layer 30 between two adjacent pixel openings 31 .

[0115] See also Figure 6 The experimental group structure is as follows: a first film layer 40 is disposed between two adjacent pixel openings 31, and the first film layer 40 is provided with a recessed portion 41. The thickness of the recessed portion 41 is equal to the thickness of the first film layer 40, and the sidewalls of the recessed portion 41 are flat. The angle between the sidewalls of the recessed portion 41 and the upper surface of the pixel definition layer 30 is A2. The value of A2 is one of 100 degrees, 105 degrees, 110 degrees, 115 degrees, 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, and 145 degrees. The thickness of the first film layer 40 is one of 0.2 microns, 0.3 microns, 0.4 microns, 0.5 microns, 0.6 microns, 0.7 microns, and 0.8 microns.

[0116] After the experiment, the increase in resistance of each experimental group compared to the control group is shown in the following table, where H is the thickness of the first film layer, and A2 is the angle formed by the sidewall of the recessed portion 41 and the upper surface of the pixel definition layer 30:

[0117]

[0118] As shown in the table above, as the thickness of the first film layer 40 increases, the resistance increase in the leakage path between two adjacent light-emitting devices also increases. As the angle A2 formed between the sidewalls of the recessed portion 41 and the upper surface of the pixel definition layer 30 decreases, the resistance increase in the leakage path between two adjacent light-emitting devices also increases. In actual production, the thickness of the first film layer 40 and the angle A2 formed between the sidewalls of the recessed portion 41 and the upper surface of the pixel definition layer 30 can be set according to actual needs.

[0119] For example, the luminous intensity of a hidden light-emitting device is 0.02 nits. In a low-grayscale display, depending on the product, the luminous intensity of the hidden light-emitting device is reduced to a value of 0.008 nits, 0.005 nits, or 0.003 nits. To the human eye, this can be seen as no light in the low-grayscale display. Taking the example of reducing the luminous intensity of the hidden light-emitting device from 0.02 nits to 0.008 nits, the reduction in luminous intensity is 60%. Therefore, according to the above table, the thickness of the first film layer 40 can be set to 0.8 microns, and the angle A2 formed by the sidewall of the recessed portion 41 and the upper surface of the pixel definition layer 30 can be set to 105 degrees or 100 degrees. At this time, the corresponding resistance increases are 62.9% and 95.5%, thereby reducing the brightness of the adjacent hidden light-emitting device. Alternatively, the thickness of the first film layer 40 can be set to 0.7 microns, and the angle A2 formed between the sidewalls of the recessed portion 41 and the upper surface of the pixel definition layer 30 can be set to 100 degrees. In this case, the corresponding resistance increase is 83.6%, thereby reducing the brightness of adjacent light-emitting devices. Alternatively, the thickness of the first film layer 40 can be set to 0.6 millimeters, and the angle A2 formed between the sidewalls of the recessed portion 41 and the upper surface of the pixel definition layer 30 can be set to 100 degrees. In this case, the corresponding resistance increase is 71.6%, thereby reducing the brightness of adjacent light-emitting devices.

[0120] In the third embodiment of the present application:

[0121] In order to avoid redundancy, the third embodiment of the present application will describe parts different from the second embodiment of the present application.

[0122] The third embodiment of the present application is different from the second embodiment of the present application in that:

[0123] Optional, see Figure 9 At least two recessed portions 41 are located between two adjacent pixel openings 31 , and at least two recessed portions 41 are spaced apart along the extending direction of the two adjacent pixel openings 31 .

[0124] As the number of recessed portions 41 between two adjacent sub-pixels increases, the leakage path between the two adjacent sub-pixels is extended, the leakage current is reduced, and the brightness of the adjacent sub-pixels after being illuminated is also reduced, thereby reducing the impact of the stealth phenomenon on low grayscale display images.

[0125] Optional, see Figure 10 The first film layer 40 further includes a third sub-portion 44 . The third sub-portion 44 is spaced apart and disposed on a side of the second sub-portion 43 away from the first sub-portion 42 . A recessed portion 41 is formed between the third sub-portion 44 and the second sub-portion 43 .

[0126] Optionally, the second light-emitting portion 62 further includes a sixth subsegment 62f, a seventh subsegment 62g, an eighth subsegment 62h, and a ninth subsegment 62i, which are sequentially connected to the first subsegment 62a, the second subsegment 62b, the third subsegment 62c, the fourth subsegment 62d, and the fifth subsegment 62e.

[0127] Optionally, the sixth sub-segment 62f is provided on a side of the second sub-portion 43 close to the third sub-portion 44. The seventh sub-segment 62g is provided on a portion of the pixel definition layer 30 exposed to the recessed portion 41 and is located between the second sub-portion 43 and the third sub-portion 44. The eighth sub-segment 62h is provided on a side of the third sub-portion 44 close to the second sub-portion 43. The ninth sub-segment 62i is provided on a side of the third sub-portion 44 away from the pixel definition layer 30 and is located outside the recessed portion 41.

[0128] Optionally, the thickness of any one of the second subsegment 62b, the fourth subsegment 62d, the sixth subsegment 62f, and the eighth subsegment 62h is smaller than the thickness of any one of the first subsegment 62a, the third subsegment 62c, the fifth subsegment 62e, the seventh subsegment 62g, and the ninth subsegment 62i.

[0129] In this embodiment, the second light-emitting portion 62 of one of the two adjacent light-emitting devices covers both recessed portions 41. In this embodiment, the second subsegment 62b covers the side surfaces of the first subsegment 42, the fourth subsegment 62d covers the side surfaces of the second subsegment 43, the sixth subsegment 62f covers the side surfaces of the second subsegment 43, and the eighth subsegment 62h covers the side surfaces of the third subsegment 44. The side surfaces of the first subsegment 42, the second subsegment 43, and the third subsegment 44 all intersect with the plane of the substrate 10. Therefore, the thickness of each of the second subsegment 62b, the fourth subsegment 62d, the sixth subsegment 62f, and the eighth subsegment 62h is less than the thickness of each of the first subsegment 62a, the third subsegment 62c, the fifth subsegment 62e, the seventh subsegment 62g, and the ninth subsegment 62i. In this embodiment, the resistance of the leakage path is determined by the portion of the second light-emitting portion 62 with the smallest thickness. Since the second sub-segment 62b, the fourth sub-segment 62d, the sixth sub-segment 62f, and the eighth sub-segment 62h are relatively thin, the resistance of the leakage path can be increased, thereby reducing the leakage current between two adjacent overlapping or connected light-emitting devices. The brightness of adjacent sub-pixels after being illuminated is also reduced, thereby reducing the impact of the stealth phenomenon on low-grayscale display images.

[0130] Optionally, the thickness of the third subsection 44 is greater than or equal to 0.2 microns. The thickness of the third subsection 44 may be equal to or different from the thickness of the first subsection 42 and the thickness of the second subsection 43. The thickness of the third subsection 44 is preferably selected from the group consisting of 0.2 microns, 0.3 microns, 0.4 microns, 0.5 microns, 0.6 microns, 0.7 microns, and 0.8 microns. Increasing the thickness of the third subsection 44 reduces leakage current between adjacent light-emitting devices, and the brightness of adjacent sub-pixels after being illuminated also decreases, thereby reducing the impact of the "stealth" phenomenon on low-grayscale displays.

[0131] In the fourth embodiment of the present application:

[0132] Optionally, an included angle A3 between the side wall of the recessed portion 41 and the bottom wall of the recessed portion 41 is in a range of 60 degrees to 80 degrees. The second light emitting portion 62 is separated at the recessed portion 41 .

[0133] See also Figure 11 In this embodiment, the angle A3 between the side wall of the recessed portion 41 and the bottom wall of the recessed portion 41 is in the range of 60 degrees to 80 degrees, forming an undercut structure. The second light-emitting portion 62 is separated at the recessed portion 41, thereby blocking the leakage path, making it impossible for the adjacent light-emitting devices to be illuminated, and reducing the impact of the stealth phenomenon on the low grayscale display screen.

[0134] The above describes in detail the specific embodiments of the present application. The above embodiments disclosed in this application are merely preferred embodiments of the present application. Those skilled in the art will appreciate that many variations and improvements can be made without departing from the spirit of the present application. These variations and improvements fall within the scope of protection defined by the claims of this application.

Claims

1. A display panel, characterized in that: include: substrate; a plurality of first electrodes, disposed on one side of the substrate; a pixel definition layer, disposed on one side of the substrate and covering the plurality of first electrodes, wherein the pixel definition layer is provided with a plurality of pixel openings, each of the pixel openings exposing one of the first electrodes; a first film layer, disposed on a side of the pixel definition layer away from the substrate and located between two adjacent pixel openings, wherein a recessed portion is provided on the side of the first film layer away from the pixel definition layer, and a depth of the recessed portion is less than or equal to a thickness of the first film layer; a light-emitting layer comprising a first light-emitting portion and a second light-emitting portion connected to each other, wherein the first light-emitting portion is disposed within the pixel opening and on a side of the first electrode away from the substrate, the second light-emitting portion is disposed on a side of the first film layer away from the substrate, the second light-emitting portion continuously covers at least a portion of the recessed portion, a first portion of the second light-emitting portion is disposed on a sidewall of the recessed portion, and a thickness of the first portion of the second light-emitting portion is less than a thickness of the second portion of the second light-emitting portion; as well as a second electrode, covering a side of the light-emitting layer away from the substrate; When the depth of the recessed portion is less than the thickness of the first film layer, the second portion of the second light-emitting portion is disposed on the bottom wall of the recessed portion; When the depth of the recessed portion is equal to the thickness of the first film layer, the recessed portion exposes a portion of the pixel definition layer, and the second portion of the second light-emitting portion is located at the portion of the pixel definition layer exposed to the recessed portion.

2. The display panel according to claim 1, wherein The depth of the recessed portion is less than the thickness of the first film layer, and the angle between the sidewall of the recessed portion and the bottom wall of the recessed portion is in a range of 90 degrees to 160 degrees.

3. The display panel according to claim 1, wherein The depth of the recessed portion is equal to the thickness of the first film layer, and the angle between the sidewall of the recessed portion and the plane where the portion of the pixel definition layer exposed to the recessed portion is located is in a range of 90 degrees to 160 degrees.

4. The display panel according to claim 3, wherein: The first film layer includes a first sub-portion and a second sub-portion spaced apart along the extending direction of two adjacent pixel openings, and a recessed portion is formed between the first sub-portion and the second sub-portion; The second light emitting portion includes: a first subsegment, disposed on a side of the first sub-portion away from the pixel definition layer and located outside the recessed portion; a second subsection, provided on a side of the first subsection close to the second subsection; a third subsection, provided at a portion of the pixel definition layer exposed to the recessed portion and located between the first subsection and the second subsection; a fourth subsection, provided on a side of the second subsection close to the first subsection; and a fifth subsegment, provided on a side of the second sub-portion away from the pixel definition layer and located outside the recessed portion; The first sub-segment, the second sub-segment, the third sub-segment, the fourth sub-segment, and the fifth sub-segment are connected in sequence; The thickness of any one of the second subsegment and the fourth subsegment is smaller than the thickness of any one of the first subsegment, the third subsegment, and the fifth subsegment.

5. The display panel according to claim 4, wherein: At least two of the recessed portions are located between two adjacent pixel openings, and at least two of the recessed portions are spaced apart along an extension direction of the two adjacent pixel openings.

6. The display panel according to claim 5, wherein: The first film layer further includes a third sub-portion, the third sub-portion being spaced apart and arranged on a side of the second sub-portion away from the first sub-portion, with a recess being formed between the third sub-portion and the second sub-portion; The second light emitting unit further includes: a sixth subsection, provided on a side of the second subsection close to the third subsection; a seventh subsection, provided at a portion of the pixel definition layer exposed to the recessed portion and located between the second subsection and the third subsection; an eighth subsection, provided on a side of the third subsection close to the second subsection; and a ninth subsegment, disposed on a side of the third sub-portion away from the pixel definition layer and located outside the recessed portion; The first subsection, the second subsection, the third subsection, the fourth subsection, the fifth subsection, the sixth subsection, the seventh subsection, the eighth subsection, and the ninth subsection are connected in sequence; The thickness of any one of the second subsegment, the fourth subsegment, the sixth subsegment, and the eighth subsegment is smaller than the thickness of any one of the first subsegment, the third subsegment, the fifth subsegment, the seventh subsegment, and the ninth subsegment.

7. The display panel according to claim 6, wherein: The thickness of the first sub-portion is greater than or equal to 0.2 micrometers, the thickness of the second sub-portion is greater than or equal to 0.2 micrometers, and the thickness of the third sub-portion is greater than or equal to 0.2 micrometers.

8. The display panel according to claim 1, wherein: An included angle between the side wall of the recessed portion and the bottom wall of the recessed portion is in a range of 60 degrees to 80 degrees, and the second light-emitting portion is separated at the recessed portion.

9. The display panel according to claim 1, wherein: The light-emitting layer includes: a first sub-light-emitting layer, comprising a first sub-light-emitting portion and a second sub-light-emitting portion connected to each other, wherein the first sub-light-emitting portion is disposed within the pixel opening and on a side of the first electrode away from the substrate, and the second sub-light-emitting portion is disposed on a side of the first film layer away from the substrate and covers at least a portion of the recessed portion; a second sub-light-emitting layer comprising a third sub-light-emitting portion and a fourth sub-light-emitting portion connected to each other, wherein the third sub-light-emitting portion is disposed within the pixel opening and on a side of the first sub-light-emitting portion away from the substrate, and the fourth sub-light-emitting portion is disposed on a side of the second sub-light-emitting portion away from the substrate and covers at least a portion of the recessed portion; and a charge generation layer, disposed between the first sub-light-emitting layer and the second sub-light-emitting layer; The first sub-light-emitting portion and the third sub-light-emitting portion form the first light-emitting portion, and the second sub-light-emitting portion and the fourth sub-light-emitting portion form the second light-emitting portion.

10. The display panel according to any one of claims 1 to 9, wherein: The display panel further includes a second film layer, the second film layer is located between the side wall of the pixel opening and the first light-emitting portion, and the second film layer is connected to the first film layer; The refractive index of the material of the second film layer is greater than the refractive index of the material of the pixel definition layer.

11. The display panel according to claim 10, wherein: The second film layer is arranged around the side wall of the pixel opening, and the angle formed by the side wall of the pixel opening and the plane where the substrate is located is in the range of 10 degrees to 30 degrees. The difference between the refractive index of the material of the second film layer and the refractive index of the material of the pixel definition layer is greater than 0.

1.

12. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 11.

Images