Display panel, manufacturing method thereof, and display device

Abstract

The present application discloses a display panel, a manufacturing method thereof and a display device, wherein the display panel includes a substrate, a light-emitting unit layer and a pixel definition layer, wherein the light-emitting unit layer is arranged on the substrate and includes a plurality of light-emitting units, and the plurality of light-emitting units are arranged in the opening area respectively; the pixel definition layer is arranged on the substrate and is located in the non-opening area; wherein the light-emitting unit includes a bottom electrode, a light-emitting layer and a top electrode which are sequentially stacked in a direction away from the substrate; the bottom electrode extends from the opening area to the non-opening area, and the bottom electrode includes a first electrode and a second electrode, the first electrode and the second electrode are arranged in the same layer and are electrically connected, the first electrode is arranged under the light-emitting layer, and the second electrode is arranged under the pixel definition layer; the reflectivity of the first electrode is greater than the reflectivity of the second electrode. The above scheme is used to improve the phenomenon of color mixing, glare and the like caused by the reflection of ambient light when the display panel is in a black state.

Description

Technical Field

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

[0002] With the continuous development of OLED (Organic Light-Emitting Diode) display technology, OLED is being used more and more widely in displays such as smartphones, tablets, computers, and televisions. OLED displays have the advantages of being thin and light, high contrast, fast response, wide viewing angle, high brightness, and full color. In order to reduce the reflectivity of external light in OLED displays, the current mainstream solution is to attach a circular polarizer to the light-emitting surface of the OLED display. However, this solution reduces the light-emitting effect due to the large light loss of the circular polarizer. Another solution is to set a color filter on the light-emitting surface of the OLED display, also known as a COE (Color filter on Encapsulation) display panel, to improve the light-emitting efficiency through a color filter.

[0003] However, in COE display panels, due to the high transmittance of the color filter, the bottom electrode in the light-emitting unit needs to have high reflectivity, and when ambient light is incident on the bottom electrode, it is easy to reflect and cause glare and other problems. Therefore, those skilled in the art are in urgent need of a technical solution that can solve the problem of ambient light reflection. Summary of the invention

[0004] The purpose of the present application is to provide a display panel and a manufacturing method thereof and a display device, so as to improve the phenomenon of color mixing, glare, etc. caused by the reflection of ambient light when the display panel is in a black state.

[0005] The present application discloses a display panel, comprising an opening area and a non-opening area, wherein the display panel comprises a substrate, a light-emitting unit layer and a pixel definition layer, wherein the light-emitting unit layer is arranged on the substrate and comprises a plurality of light-emitting units, and the plurality of light-emitting units are respectively arranged in the opening area; the pixel definition layer is arranged on the substrate and is located in the non-opening area; wherein the light-emitting unit comprises a bottom electrode, a light-emitting layer and a top electrode which are sequentially stacked in a direction away from the substrate; the bottom electrode extends from the opening area to the non-opening area, and the bottom electrode comprises a first electrode and a second electrode, the first electrode and the second electrode are arranged in the same layer and are electrically connected, the first electrode is arranged under the light-emitting layer, and the second electrode is arranged under the pixel definition layer; the reflectivity of the first electrode is greater than the reflectivity of the second electrode.

[0006] Optionally, the first electrode is formed of at least a metal material, and the second electrode is formed of at least a metal oxide or a metal sulfide.

[0007] Optionally, the second electrode includes a conductive layer and an anti-reflective layer, the conductive layer is formed of a metal material, the anti-reflective layer is formed of a metal oxide or a metal sulfide, the metal material includes silver, the metal oxide includes silver oxide, and the metal sulfide includes silver sulfide.

[0008] Optionally, the ratio of the thickness of the conductive layer to the thickness of the anti-reflection layer is in the range of 2 to 20.

[0009] Optionally, the anti-reflection layer has a thickness between 5 nm and 30 nm.

[0010] Optionally, the conductive layer and the anti-reflection layer are formed of the same metal material, and the metal material in the area where the anti-reflection layer is located is subjected to oxidation or sulfidation reaction to form metal oxide or metal sulfide to form the anti-reflection layer.

[0011] Optionally, the bottom electrode also includes a first transparent conductive layer and a second transparent conductive layer, the first electrode is arranged between the first transparent conductive layer and the second transparent conductive layer, and the second electrode is arranged between the first transparent conductive layer and the second transparent conductive layer; the multiple light-emitting units respectively include a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit; the thickness of the anti-reflection layer corresponding to the blue light-emitting unit is less than the thickness of the anti-reflection layer corresponding to the green light-emitting unit, and the thickness of the anti-reflection layer corresponding to the green light-emitting unit is less than the thickness of the anti-reflection layer corresponding to the red light-emitting unit.

[0012] The present application also discloses a method for manufacturing a display panel, comprising the steps of:

[0013] A first electrode in the bottom electrode is formed in the opening area of ​​the substrate by using a metal material, and a second electrode is formed in the non-opening area of ​​the substrate;

[0014] forming a light-emitting layer on the first electrode;

[0015] forming a pixel definition layer on the second electrode;

[0016] forming a top electrode on the light emitting layer and the pixel definition layer;

[0017] forming a display panel;

[0018] The bottom electrode includes a first electrode and a second electrode which are arranged in the same layer and electrically connected, and the reflectivity of the first electrode is greater than the reflectivity of the second electrode.

[0019] Optionally, the step of forming a first electrode in the bottom electrode in the opening area of ​​the substrate and forming a second electrode in the non-opening area of ​​the substrate includes:

[0020] Using metal material to form a first electrode in the opening area and the non-opening area;

[0021] The surface of the first electrode in the non-opening area is oxidized or sulfurized to form an anti-reflection layer, and the first electrode that has not undergone oxidation or sulfurization reaction forms a conductive layer;

[0022] The second electrode includes a conductive layer and an anti-reflection layer, the conductive layer and the anti-reflection layer are formed of the same metal material, and the metal material in the area where the anti-reflection layer is located is oxidized or sulfided to form a metal oxide or metal sulfide to form the anti-reflection layer.

[0023] The present application also discloses a display device, comprising a driving circuit and the above-mentioned display panel, wherein the driving circuit is used to drive the display panel to display.

[0024] The present application forms the bottom electrode of the effective light-emitting area in the light-emitting unit with a material having high reflective properties, but the bottom electrode below the pixel definition layer, i.e., the second electrode, mainly plays the role of transmitting signals and does not actually participate in light emission, so the second electrode belongs to the invalid light-emitting area. The second electrode below the pixel definition layer is formed with a material having low reflective properties, thereby reducing the reflection of ambient light by the bottom electrode below the pixel definition layer, thereby achieving low reflection of ambient light. This improves the problem of mixed color glare caused by reflection in the black state of the display panel, improves the display effect of the display panel, and enhances the taste of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 is a cross-sectional schematic diagram of the display panel of the present application;

[0027] Figure 2 is a schematic diagram of the bottom electrode of the present application;

[0028] Figure 3 is a conductivity curve diagram of the thickness change of the anti-reflection layer in the second electrode of the present application;

[0029] Figure 4a is a reflectivity curve diagram of the anti-reflection layer of the present application using silver oxide material;

[0030] Figure 4bis a reflectivity curve diagram of the anti-reflection layer of the present application using silver sulfide material;

[0031] Figure 5 is a schematic diagram of the steps of the method for manufacturing the display panel of the present application;

[0032] Figure 6 It is a schematic diagram of the steps of another method for manufacturing a display panel of the present application;

[0033] Figure 7 is a schematic diagram of a display device of the present application.

[0034] Among them, 100, display panel; 101, opening area; 102, non-opening area; 110, substrate; 120, light-emitting unit; 121, bottom electrode; 122, first electrode; 123, second electrode; 124, conductive layer; 125, anti-reflection layer; 126, light-emitting layer; 127, top electrode; 140, pixel definition layer; 160, encapsulation layer; 170, color filter layer; 171, color filter part; 172, black matrix; 180, driving layer; 200, display device; 210, driving circuit. DETAILED DESCRIPTION

[0035] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0036] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "multiple" means two or more. In addition, the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. indicating orientation or positional relationships are described based on the orientation or relative positional relationships shown in the accompanying drawings, and are only for the convenience of describing the simplified description of the present application, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0037] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0038] Figure 1 is a cross-sectional schematic diagram of the display panel of the present application, see Figure 1As shown, the present application discloses a display panel 100 , which includes an opening area 101 and a non-opening area 102 . The display panel 100 also includes a substrate 110, a light-emitting unit 120 layer and a pixel definition layer 140, wherein the light-emitting unit 120 layer is arranged on the substrate 110, and the light-emitting unit 120 layer includes a plurality of light-emitting units 120, and the plurality of light-emitting units 120 are respectively arranged in the opening area 101; the pixel definition layer 140 is arranged on the substrate 110 and is located in the non-opening area 102; wherein the light-emitting unit 120 includes a bottom electrode 121, a light-emitting layer 126 and a top electrode 127 which are stacked in sequence in a direction away from the substrate 110; the bottom electrode 121 extends from the opening area 101 to the non-opening area 102, and the bottom electrode 121 includes a first electrode 122 and a second electrode 123, the first electrode 122 and the second electrode 123 are arranged in the same layer and are electrically connected, the first electrode 122 is arranged under the light-emitting layer 126, and the second electrode 123 is arranged under the pixel definition layer 140; the reflectivity of the first electrode is greater than the reflectivity of the second electrode.

[0039] In the present application, the bottom electrode 121 of the effective light-emitting area in the light-emitting unit 120 is formed of a material with high reflective properties, but the bottom electrode 121 below the pixel definition layer 140, i.e., the second electrode 123, mainly plays the role of transmitting signals and does not actually participate in light emission, so the second electrode 123 belongs to the invalid light-emitting area. The second electrode 123 below the pixel definition layer 140 is formed of a material with low reflective properties, thereby reducing the reflection of ambient light by the bottom electrode 121 below the pixel definition layer 140, thereby achieving low reflection of ambient light. The problem of mixed color glare caused by reflection in the black state of the display panel 100 is improved, the display effect of the display panel 100 is improved, and the taste of the display panel 100 is improved.

[0040] Specifically, the first electrode 122 is at least formed of a metal material, and the second electrode 123 is at least formed of a metal oxide or a metal sulfide.

[0041] The present application forms the bottom electrode 121 of the effective light-emitting area in the light-emitting unit 120 as a metal material with high reflectivity, but the bottom electrode 121 below the pixel definition layer 140, i.e., the second electrode 123, mainly plays the role of transmitting signals and does not actually participate in light emission, so the second electrode 123 belongs to the invalid light-emitting area. The second electrode 123 below the pixel definition layer 140 is formed of a metal oxide or a metal sulfide, and the reflectivity of the metal oxide or the metal sulfide is lower than the reflectivity of the first electrode 122 formed of a metal material, thereby reducing the reflection of ambient light by the bottom electrode 121 below the pixel definition layer 140, thereby achieving low reflection of ambient light. The problem of mixed color glare caused by reflection in the black state of the display panel 100 is improved, the display effect of the display panel 100 is improved, and the taste of the display panel 100 is improved.

[0042] Generally speaking, a driving layer 180, i.e., a thin film transistor layer, is further provided between the substrate 110 and the light emitting unit 120. The driving layer 180 is provided with a plurality of thin film transistors arranged in an array, and the output end of each thin film transistor, i.e., the drain, is connected to the bottom electrode 121 of a light emitting unit 120 through a via hole. Through the control of the thin film transistor, different data signals are transmitted to the bottom electrode 121 of each light emitting unit 120 to achieve different light emitting displays. It can be understood that the first electrode 122 is electrically connected to the second electrode 123.

[0043] The bottom electrode 121 needs to use a metal electrode with a high reflectivity as the anode of the light-emitting unit 120 to emit most of the light from the top electrode 127 side. Of course, there is also a composite electrode with a stack of a transparent conductive layer and a metal electrode as the anode. The top electrode 127 generally uses a transparent conductive layer as the cathode of the light-emitting unit 120. Since the bottom electrode 121 has high reflectivity, under a certain voltage drive, electrons and holes move from the cathode and anode to the light-emitting layer 126 respectively and recombine to emit visible light. Therefore, the light-emitting unit 120 generally emits light in one direction, such as a bottom-emitting light-emitting unit 120. In addition, there is a top-emitting light-emitting unit 120, which uses the anode and cathode materials interchangeably to form light emitted from top to bottom. This application is mainly described by taking the bottom-emitting light-emitting unit 120 as an example.

[0044] It can be understood that the OLED display panel 100 without a polarizer has the advantages of high efficiency and high color purity compared to the OLED display panel 100 with a polarizer, because the anode has an extremely high reflectivity, combined with the semi-transparent cathode and the optical cavity length adjustment, combined with the high-transmittance color filter layer 170. The COE display panel 100 generally also includes an encapsulation layer 160 and a color filter layer 170. The encapsulation layer 160 is generally arranged on the light-emitting unit 120 layer for encapsulating the light-emitting unit 120 layer. The color filter layer 170 is arranged on the encapsulation layer 160, and the color filter layer 170 includes a plurality of color filter portions 171, which are respectively a red filter portion, a green filter portion and a blue filter portion, and the color filter portions 171 of different colors are separated by a black matrix 172.

[0045] The light-emitting unit 120 in this embodiment includes a red light-emitting unit 120R, a green light-emitting unit 120G and a blue light-emitting unit 120B, and the red light-emitting unit 120, the green light-emitting unit 120 and the blue light-emitting unit 120 are arranged in an array. The display panel 100 in this embodiment is an OLED display panel 100 with RGB light-emitting units 120 as light sources. Of course, the light-emitting unit 120 in the present application can also be a white light-emitting unit 120, forming an OLED display panel 100 with white light as a light source. When the light-emitting unit 120 of the display panel 100 is an RGB light-emitting unit 120, the red filter portion is set corresponding to the red light-emitting unit 120, the green filter portion is set corresponding to the green light-emitting unit 120, and the blue filter portion is set corresponding to the blue light-emitting unit 120. When the display panel 100 is a white light-emitting unit 120, the red filter portion, the green filter portion and the blue filter portion are arranged in an array.

[0046] Among them, the opening area 101 generally refers to the position of the color filter portion 171, which is an area that can display RGB colors during display, roughly corresponding to the area between adjacent pixel definition layers 140 of the display panel 100. The non-opening area 102 is the position of the black matrix 172, which is an area that appears black during display, roughly corresponding to the area of ​​the pixel definition layer 140. Generally speaking, the opening area 101 and the non-opening area 102 are both located in the display area of ​​the display panel 100.

[0047] Specifically, the metal material may be silver, the metal oxide may be silver oxide, and the metal sulfide may be silver sulfide. Generally speaking, the anode of an OLED is made of a metallic silver material, which has high conductivity and high reflectivity. Silver has excellent conductivity and can effectively guide the passage of current. At the same time, the high reflectivity of silver also greatly improves the brightness of the OLED. In addition, silver has good corrosion resistance and can resist the effects of oxidation, thereby ensuring the stability and long life of the OLED. Silver oxide (Ag2O) has a low reflectivity. It is a brown-black solid that is widely used in the electronics industry, batteries, semiconductors and other fields. Silver sulfide (Ag2S) has the same low reflectivity as silver oxide and is a gray-black solid. The reflectivity can be reduced to 50% after the silver layer is covered with a thin layer of silver oxide, and the reflectivity can be reduced to 45% after the silver layer is covered with a thin layer of silver sulfide, while the reflectivity of pure silver (Ag) is about 98%. Of course, the specific reflectivity is also related to the thickness of silver oxide and silver sulfide.

[0048] Figure 2 is a schematic diagram of the bottom electrode of the present application, combined with Figure 1 As shown, the second electrode 123 includes a conductive layer 124 and an anti-reflection layer 125. The conductive layer 124 is formed of a metal material, and the anti-reflection layer 125 is formed of a metal oxide or a metal sulfide. The metal material may be silver, the metal oxide may be silver oxide, and the metal sulfide may be silver sulfide.

[0049] Considering the actual use, although silver oxide and silver sulfide have certain conductivity, if the second electrode 123 is formed entirely of oxidized metal materials, it will cause a difference in resistance between the second electrode 123 and the first electrode 122, resulting in uneven resistance distribution and different voltage drops, which will cause uneven loss during data signal transmission.

[0050] In this embodiment, the anti-reflection layer 125 is disposed on the side of the conductive layer 124 facing the light emitting surface, that is, when ambient light is incident on the bottom electrode 121 , the anti-reflection layer 125 absorbs part of the ambient light to reduce ambient light reflection.

[0051] Specifically, the ratio of the thickness of the conductive layer 124 to the thickness of the anti-reflection layer 125 is in the range of 2 to 20.

[0052] Figure 3 is a conductivity curve of the anti-reflection layer thickness change in the second electrode of the present application, see Figure 3 As shown, Figure 3The second electrode 123 is 100nm thick and 6um long, and the conductive layer 124 is formed of a metallic silver material, and the anti-reflection layer 125 is formed of a silver oxide material. When the thickness of the anti-reflection layer 125 reaches 10nm, the thickness of the conductive layer 124 is 90nm. At this time, the resistance is increased by about 10% compared with the second electrode 123 formed of a silver material of 100nm thick and 6um long. When the thickness of the anti-reflection layer 125 reaches 20nm, when the thickness of the anti-reflection layer 125 reaches 20nm and the thickness of the conductive layer 124 is 80nm, the resistance at this time increases by about 20%. However, when the thickness of the anti-reflection layer 125 reaches 30nm, the thickness of the conductive layer 124 is 70nm, and the resistance has increased to 40%. When the thickness of the anti-reflection layer 125 reaches 40nm, the thickness of the conductive layer 124 is 60nm, and the resistance increases to 60%. Considering the flatness and other issues, the thickness of the second electrode 123 is kept consistent with the thickness of the first electrode 122. Moreover, the thickness of the bottom electrode 121 of the light-emitting unit 120 has certain requirements and cannot be infinitely increased. Therefore, the greater the thickness of the anti-reflection layer 125 provided in the second electrode 123, the greater the impedance of the second electrode 123. In actual use, the impedance of the second electrode 123 should be no greater than 150% of the first electrode 122, the corresponding thickness of the anti-reflection layer 125 should be less than or equal to 30 nm, and the ratio of the thickness of the conductive layer 124 to the thickness of the anti-reflection layer 125 should be greater than 2.

[0053] Figure 4a is a reflectivity curve diagram of the anti-reflection layer of the present application using silver oxide material, Figure 4b is a reflectivity curve of the anti-reflection layer of the present application using silver sulfide material, wherein: Figure 4a and 4b , when the wavelength is 560, the thickness of the anti-reflection layer 125 increases by 1nm from 1nm to 20nm, and the reflectivity gradually decreases. Due to limited space in the figure, only the curves at the two ends are marked when the thickness of the anti-reflection layer 125 is 1nm and 20nm. Figure 4aAs shown, the anti-reflection layer 125 is formed of silver oxide material as an example. When the thickness of the anti-reflection layer 125 is 5nm, the reflectivity of blue light with a wavelength of 400 is about 0.725, the reflectivity of green light with a wavelength of about 50 is about 0.875, and the reflectivity of red light with a wavelength of about 700 can be appropriately reduced, but the degree of reduction is limited. When the thickness of the anti-reflection layer 125 is 10nm, the reflectivity of blue light with a wavelength of 400 is about 0.55, the reflectivity of green light with a wavelength of about 50 is about 0.8, and the reflectivity of red light with a wavelength of about 700 can be appropriately reduced to about 0.95. Based on the above, the greater the thickness of the anti-reflection layer 125, the lower the corresponding reflectivity. However, considering the influence of resistance, the minimum thickness of the anti-reflection layer 125 should be greater than or equal to 5 nm, and the ratio of the thickness of the conductive layer 124 to the thickness of the anti-reflection layer 125 should be less than 20.

[0054] Furthermore, the thickness of the anti-reflection layer 125 is between 5 nm and 30 nm.

[0055] Specifically, the plurality of light-emitting units 120 include a red light-emitting unit 120, a green light-emitting unit 120 and a blue light-emitting unit 120 respectively; the thickness of the anti-reflection layer 125 corresponding to the blue light-emitting unit 120 is less than the thickness of the anti-reflection layer 125 corresponding to the green light-emitting unit 120, and the thickness of the anti-reflection layer 125 corresponding to the green light-emitting unit 120 is less than the thickness of the anti-reflection layer 125 corresponding to the red light-emitting unit 120. Considering that the reflectivity of the anti-reflection layer 125 to different wavelengths is different, in order to balance the light of different colors as much as possible, the anti-reflection layer 125 can be set to have different thicknesses. However, due to the red light, even if a thicker anti-reflection layer 125 is set, the anti-reflection effect on the light of the red wavelength band is still limited, especially compared with the reflection of green and blue light. Therefore, for the anti-reflection layer 125 in the red light-emitting unit 120, the thickest can be set, but it should not exceed the range of resistance impedance. As for the anti-reflection layer 125 of the green and blue light-emitting units 120 , in this embodiment, since the anti-reflection layer 125 has a stronger absorption effect on blue light, the thickness of the anti-reflection layer 125 in the corresponding blue light-emitting unit 120 is lower than that of the anti-reflection layer 125 in the green light-emitting unit 120 .

[0056] In another embodiment, the thickness of the anti-reflection layer 125 corresponding to the light-emitting units 120 of different colors is consistent, which is more convenient and cost-saving during the process. It can be understood that the anti-reflection layer 125 is generally arranged between adjacent light-emitting units 120. Therefore, the thickness of the anti-reflection layer 125 is set to be consistent, and the uniformity of the display panel 100 is better. Moreover, relatively speaking, the ambient light reflection in the pixel definition layer 140 area is more of a large-angle reflection. In simple terms, the ambient light enters from the opening area 101, and the vertical light generally directly hits the first electrode 122, and only the light at a certain angle will hit the non-opening area 102. And because the color filter parts 171 of different colors have a certain light absorption ability in this application, that is, they absorb other light and pass the corresponding light. Therefore, there is generally a large-angle light reflected by the second electrode 123, causing glare. In this embodiment, by reducing the reflection of blue and green light, the glare problem has been greatly improved, so that the display panel 100 has a good display effect even in the dark state under direct sunlight.

[0057] In the present application, the conductive layer 124 and the anti-reflection layer 125 in the second electrode 123 can be formed of different materials respectively. For example, a silver material is first selected to form the conductive layer 124, and then silver oxide or silver sulfide material is used to form the anti-reflection layer 125. The silver oxide film is mostly prepared by physical vapor deposition and chemical vapor deposition methods.

[0058] However, relatively speaking, the present application also discloses a method of saving the process, that is, through an oxidation process, a part of the silver in the conductive layer 124 is oxidized to form a silver oxide layer, or is sulfided to form silver sulfide.

[0059] Specifically, the conductive layer 124 and the anti-reflection layer 125 are formed of the same metal material, and the metal material in the area where the anti-reflection layer 125 is located is oxidized or sulfided to form metal oxide or metal sulfide to form the anti-reflection layer 125 .

[0060] In this embodiment, in the step of forming the first electrode 122, a silver material is used to form a whole silver electrode layer on the substrate 110, and after patterning, the first electrode 122 is formed in the opening area 101, while the photoresist on the first electrode 122 is retained. The second electrode 123 is oxidized or sulfided to form an anti-reflection layer 125 of silver oxide or silver sulfide, so as to serve as the anti-reflection layer 125.

[0061] Figure 5 is a schematic diagram of the steps of the method for manufacturing the display panel of the present application, see Figure 5 As shown, the present application discloses a method for manufacturing a display panel, comprising the steps of:

[0062] S110: forming a first electrode in the bottom electrode in the opening area of ​​the substrate, and forming a second electrode in the non-opening area of ​​the substrate;

[0063] S120: forming a light-emitting layer on the first electrode;

[0064] S130: forming a pixel definition layer on the second electrode;

[0065] S140: forming a top electrode on the light-emitting layer and the pixel definition layer;

[0066] S150: forming a display panel;

[0067] The bottom electrode includes a first electrode and a second electrode which are arranged in the same layer and electrically connected, and the reflectivity of the first electrode is greater than the reflectivity of the second electrode.

[0068] Specifically, a first electrode in the bottom electrode is formed in the opening area of ​​the substrate using a metal material, and a conductive layer in the second electrode is formed in the non-opening area of ​​the substrate; an anti-reflection layer in the second electrode is formed on the conductive layer using a metal oxide or a metal sulfide;

[0069] The bottom electrode includes a first electrode and a second electrode arranged in the same layer. The first electrode is located in the opening area, and the second electrode is arranged in the non-opening area and is located under the pixel definition layer. The first electrode is formed of at least a metal material, the anti-reflection layer in the second electrode is formed of a metal oxide or a metal sulfide, and the conductive layer is formed of a metal material.

[0070] Specifically, the metal material may be silver, the metal oxide may be silver oxide, and the metal sulfide may be silver sulfide.

[0071] In this embodiment, the conductive layer and the anti-reflection layer in the second electrode can be formed of different materials, for example, a silver material is first selected to form the conductive layer, and then a silver oxide or silver sulfide material is used to form the anti-reflection layer. Through two processes, the required conductive layer and anti-reflection layer are formed. The anti-reflection layer is used to reduce the reflection effect of the anode below the pixel definition layer, thereby improving the display effect of the display panel.

[0072] In another embodiment, the step of forming the first electrode in the bottom electrode in the opening area of ​​the substrate and forming the second electrode in the non-opening area of ​​the substrate includes: using a metal material to form the first electrode in the opening area and the non-opening area; oxidizing or sulfurizing the surface of the first electrode in the non-opening area to form an anti-reflection layer, and the first electrode that has not undergone oxidation or sulfurization reaction forms a conductive layer. The details are as follows:

[0073] Figure 6Schematic diagram of another method for manufacturing a display panel of the present application. In another embodiment, the anti-reflection layer is formed by an oxidation step. Specifically, the steps include:

[0074] S210: On the substrate, a silver electrode layer is formed by using a metallic silver material, wherein the portion in the opening area is a first electrode, and the portion in the non-opening area is a second electrode;

[0075] S210: performing oxidation treatment or sulfidation treatment on a side of the second electrode close to the light emitting surface to form silver oxide or silver sulfide as an anti-reflection layer; the unreacted part of the second electrode serves as a conductive layer;

[0076] S230: forming a light-emitting layer on the first electrode;

[0077] S240: forming a pixel definition layer on the second electrode;

[0078] S250: forming a top electrode on the light-emitting layer and the pixel definition layer;

[0079] S260: forming a display panel;

[0080] In this embodiment, in the step of forming the first electrode, a silver material is used to form a whole silver electrode layer on the substrate, and after patterning, the first electrode is formed in the opening area, while the photoresist on the first electrode is retained. The second electrode is oxidized or sulfided to form an anti-reflection layer of silver oxide or silver sulfide as an anti-reflection layer.

[0081] The specific method includes: first forming a first transparent electrode layer on the substrate, forming a silver layer on the first transparent electrode layer, patterning the silver layer and the first transparent conductive layer, forming a first electrode in the opening area, forming a second electrode in the non-opening area, the first electrode and the second electrode are electrically connected, and the second electrode is formed of a silver material. The photoresist on the silver layer at the opening area is retained, and the photoresist is used to protect the area except for the area that needs to be oxidized, and then the surface of the silver layer of the second electrode is oxidized or sulfurized by oxygen plasma or sulfur plasma reaction to form an anti-reflection layer.

[0082] In this embodiment, the silver layer of the second electrode exposed outside the photoresist is oxidized in an oxygen plasma environment to form a thin film. The thin film has a nanoporous structure and has a good absorption effect on light. Of course, in another embodiment, the silver layer of the second electrode can also be surface treated by gas reaction, surface infiltration, etc. to form a low-reflection silver oxide thin film.

[0083] Figure 7 is a schematic diagram of the display device of the present application, see Figure 7As shown, the present application discloses a display device, wherein the display device 200 includes a driving circuit 210 and a display panel 100 in any of the above embodiments, wherein the driving circuit 210 is used to drive the display panel 100 to display.

[0084] The present application forms the bottom electrode 121 of the effective light-emitting area in the light-emitting unit 120 as a metal material with high reflectivity, but the bottom electrode 121 below the pixel definition layer 140, i.e., the second electrode 123, mainly plays the role of transmitting signals and does not actually participate in light emission, so the second electrode 123 belongs to the invalid light-emitting area. The second electrode 123 below the pixel definition layer 140 is formed of a metal oxide or a metal sulfide, and the reflectivity of the metal oxide or the metal sulfide is lower than the reflectivity of the first electrode 122 formed of a metal material, thereby reducing the reflection of ambient light by the bottom electrode 121 below the pixel definition layer 140, thereby achieving low reflection of ambient light. The problem of mixed color glare caused by reflection in the black state of the display panel 100 is improved, the display effect of the display panel 100 is improved, and the taste of the display panel 100 is improved.

[0085] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[0086] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A display panel, comprising an opening area and a non-opening area, characterized in that: The display panel comprises: substrate; A light emitting unit layer is arranged on the substrate and includes a plurality of light emitting units, wherein the plurality of light emitting units are respectively arranged in the opening areas; A pixel definition layer is disposed on the substrate and located in the non-opening area; Wherein, the light-emitting unit includes a bottom electrode, a light-emitting layer and a top electrode which are sequentially stacked in a direction away from the substrate; The bottom electrode extends from the opening area to the non-opening area, and the bottom electrode includes a first electrode and a second electrode, the first electrode and the second electrode are arranged in the same layer and are electrically connected, the first electrode is arranged under the light-emitting layer, and the second electrode is arranged under the pixel definition layer; the reflectivity of the first electrode is greater than the reflectivity of the second electrode; The second electrode comprises a conductive layer and an anti-reflection layer, wherein the conductive layer is formed of a metal material, and the anti-reflection layer is formed of a metal oxide or a metal sulfide; the metal material comprises silver, the metal oxide comprises silver oxide, and the metal sulfide comprises silver sulfide; The bottom electrode further includes a first transparent conductive layer and a second transparent conductive layer, the first electrode is arranged between the first transparent conductive layer and the second transparent conductive layer, and the second electrode is arranged between the first transparent conductive layer and the second transparent conductive layer; The multiple light-emitting units respectively include a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit; the thickness of the anti-reflection layer corresponding to the blue light-emitting unit is less than the thickness of the anti-reflection layer corresponding to the green light-emitting unit, and the thickness of the anti-reflection layer corresponding to the green light-emitting unit is less than the thickness of the anti-reflection layer corresponding to the red light-emitting unit.

2. The display panel according to claim 1, characterized in that: The first electrode is formed of at least a metal material, and the second electrode is formed of at least a metal oxide or a metal sulfide.

3. The display panel according to claim 1, characterized in that: A ratio of a thickness of the conductive layer to a thickness of the anti-reflection layer is in the range of 2 to 20.

4. The display panel according to claim 1, characterized in that: The thickness of the anti-reflection layer is between 5 nm and 30 nm.

5. The display panel according to claim 1, characterized in that: The conductive layer and the anti-reflection layer are formed of the same metal material, and the metal material in the area where the anti-reflection layer is located is subjected to oxidation or sulfidation reaction to form metal oxide or metal sulfide to form the anti-reflection layer.

6. A method for manufacturing a display panel, characterized in that: Includes steps: A first electrode in the bottom electrode is formed in the opening area of ​​the substrate, and a second electrode is formed in the non-opening area of ​​the substrate; forming a light-emitting layer on the first electrode; forming a pixel definition layer on the second electrode; forming a top electrode on the light-emitting layer and the pixel definition layer to form a light-emitting unit in the opening area; forming a display panel; The bottom electrode includes a first electrode and a second electrode which are arranged in the same layer and electrically connected, and the reflectivity of the first electrode is greater than the reflectivity of the second electrode; The second electrode comprises a conductive layer and an anti-reflection layer, wherein the conductive layer is formed of a metal material, and the anti-reflection layer is formed of a metal oxide or a metal sulfide; the metal material comprises silver, the metal oxide comprises silver oxide, and the metal sulfide comprises silver sulfide; The bottom electrode further includes a first transparent conductive layer and a second transparent conductive layer, the first electrode is arranged between the first transparent conductive layer and the second transparent conductive layer, and the second electrode is arranged between the first transparent conductive layer and the second transparent conductive layer; The multiple light-emitting units respectively include a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit; the thickness of the anti-reflection layer corresponding to the blue light-emitting unit is less than the thickness of the anti-reflection layer corresponding to the green light-emitting unit, and the thickness of the anti-reflection layer corresponding to the green light-emitting unit is less than the thickness of the anti-reflection layer corresponding to the red light-emitting unit.

7. The method for manufacturing a display panel according to claim 6, characterized in that: The step of forming the first electrode in the bottom electrode in the opening area of ​​the substrate and forming the second electrode in the non-opening area of ​​the substrate includes: Using metal material to form a first electrode in the opening area and the non-opening area; The surface of the first electrode in the non-opening area is oxidized or sulfurized to form an anti-reflection layer, and the first electrode that has not undergone oxidation or sulfurization reaction forms a conductive layer; The second electrode includes a conductive layer and an anti-reflection layer, the conductive layer and the anti-reflection layer are formed of the same metal material, and the metal material in the area where the anti-reflection layer is located is oxidized or sulfided to form a metal oxide or metal sulfide to form the anti-reflection layer.

8. A display device, characterized in that: It comprises a driving circuit and the display panel according to any one of claims 1 to 5, wherein the driving circuit is used to drive the display panel to display.

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