Display panel, preparation method of display panel and display device

Abstract

The invention discloses a display panel, a preparation method of the display panel and a display device. Comprising an array substrate, a pixel definition layer, a first electrode layer and a covering layer, the first electrode layer is located on the array substrate, and the pixel definition layer is arranged on the side, away from the array substrate, of the first electrode layer; the pixel definition layer is provided with a plurality of pixel openings at intervals; the covering layer is arranged on the side, away from the array substrate, of the pixel defining layer, the covering layer is made of a black material, and the surface, away from the array substrate, of the covering layer is provided with an uneven interface structure, so that the influence of ambient light on the display panel is reduced, and the visual texture and the display contrast ratio of a display surface are improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular, to a display panel, a method for manufacturing the display panel, and a display device. Background Art

[0002] An organic light-emitting display (OLED) device is a self-luminous display device, which is lighter and thinner compared with a liquid crystal display device. In addition, the organic light-emitting display device can be driven by a low voltage, and has excellent color reproducibility, short response time, wide viewing angle, and good contrast. Therefore, in recent years, the organic light-emitting display device has gradually entered the market.

[0003] When the OLED display panel is under sunlight or strong light, the external light source will irradiate the metal electrode through the transparent glass layer. Since the metal has strong reflectivity, the external light will be reflected into the human eye, resulting in visual blurring and a decrease in the contrast of the device itself. Therefore, the anti-reflection function of the display panel still has deficiencies. Summary of the Invention

[0004] The present invention provides a display panel, a method for manufacturing the display panel, and a display device, which reduce the influence of ambient light on the display panel and improve the visual texture and display contrast of the display surface.

[0005] In a first aspect, embodiments of the present invention provide a display panel, including: an array substrate, a pixel definition layer, a first electrode layer, and a cover layer;

[0006] The first electrode layer is located on the array substrate, and the pixel definition layer is disposed on a side of the first electrode layer away from the array substrate; the pixel definition layer is provided with a plurality of pixel openings at intervals; the cover layer is disposed on a side of the pixel definition layer away from the array substrate, the cover layer is made of a black material, and a surface of the cover layer away from the array substrate has an uneven interface structure.

[0007] Optionally, the cover layer is a stacked structure formed by black polymer microspheres, and the stacked structure forms an uneven interface structure on a surface away from the array substrate.

[0008] Optionally, the pixel definition layer and the cover layer are an integral structure, and the pixel definition layer and the cover layer are a stacked structure formed by the black polymer microspheres.

[0009] Optionally, the diameter of the black polymer microspheres is 10-200 nm.

[0010] Optionally, a range of the sum of the thicknesses of the pixel definition layer and the cover layer is 0.3-1.5 um.

[0011] Optionally, the display panel further includes a light-emitting layer and a second electrode layer;

[0012] The light-emitting layer is disposed within the pixel opening, and the second electrode layer is disposed on a side of the covering layer away from the array substrate. Among them, the first electrode layer, the light-emitting layer within the corresponding pixel opening, and the second electrode layer form a light-emitting unit.

[0013] In a second aspect, an embodiment of the present invention provides a method for manufacturing a display panel, including:

[0014] Form a first electrode layer on the array substrate,

[0015] Form a pixel definition layer on the first electrode layer. The pixel definition layer is provided with a plurality of pixel openings at intervals;

[0016] The covering layer is disposed on a side of the pixel definition layer away from the array substrate. The covering layer is made of a black material, and a surface of the covering layer away from the array substrate has an uneven interface structure.

[0017] Optionally, use an electrostatic inkjet method to spray black polymer microspheres on a side of the pixel definition layer away from the array substrate to form a stacked structure, and the stacked structure is the covering layer.

[0018] Optionally, use an electrostatic inkjet method to spray black polymer microspheres on a side of the first electrode layer away from the array substrate to form a stacked structure. The stacked structure is the pixel definition layer and the covering layer, and the pixel definition layer and the covering layer are an integral structure.

[0019] In a third aspect, an embodiment of the present invention provides a display device, including the display panel according to any embodiment of the present invention.

[0020] The technical solution provided by the embodiment of the present invention reduces the reflection area of the first electrode layer by providing a black covering layer on the surface of the pixel definition layer and using the black covering layer to block part of the first electrode layer, and the black covering layer can also absorb external ambient light entering the display panel. The surface of the covering layer away from the array substrate has an uneven interface structure, so that part of the external ambient light is diffusely reflected by the uneven interface structure, thereby further reducing the influence of ambient light on the display panel and improving the visual texture and display contrast of the display surface. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0022] Figure 2Schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0023] Figure 3 Schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of a manufacturing process of a display panel provided by an embodiment of the present invention;

[0025] Figure 5 Schematic flow chart of another method for manufacturing a display panel provided by an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of a manufacturing process of a display panel provided by an embodiment of the present invention;

[0027] Figure 7 Schematic structural diagram of a display device provided by an embodiment of the present invention. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] To improve the problem of light reflection of a display panel under sunlight or strong light, in the related art, black glue is coated on a transparent display screen, and the black glue is used to block the light reflection of the metal. However, in the full-screen manufacturing process, due to the low light transmittance of the black glue, the whole surface will also affect the light output efficiency of the display panel, resulting in a problem of low display picture quality of the display panel.

[0030] In view of this, Figure 1 Schematic structural diagram of a display panel provided by an embodiment of the present invention. Refer to Figure 1 , the display panel includes: an array substrate 110, a pixel definition layer 120, a first electrode layer 130, and a cover layer 140;

[0031] The first electrode layer 130 is located on the array substrate 110, and the pixel definition layer 120 is disposed on a side of the first electrode layer 130 away from the array substrate 110; the pixel definition layer 120 is provided with a plurality of pixel openings at intervals; a cover layer 140 is disposed on a side of the pixel definition layer 120 away from the array substrate 110. The cover layer 140 is made of a black material, and the surface of the cover layer 140 away from the array substrate 110 has an uneven interface structure.

[0032] Specifically, the array substrate 110 may include a substrate, a pixel circuit layer, and a metal wiring layer. The pixel circuit layer includes an active layer, a gate insulating layer, a gate layer, an interlayer insulating layer, and a source-drain layer. The metal wiring layer includes wiring layers for signal lines, scan lines, power lines, capacitor electrodes, gates, etc. The metal wiring layer may be provided in one layer or multiple layers. It should be noted that the stack structure of the display panel provided in the embodiments of the present invention is only schematic and does not limit the structure of the display panel. The first electrode layer 130 may be an anode layer. Anode layers usually adopt transparent inorganic materials, where the transparent inorganic materials include one or more of indium tin oxide, indium zinc oxide, indium tin oxide doped with silver, and indium zinc oxide doped with silver. The first electrode layer 130 may be prepared by sputtering, electron beam evaporation, thermal evaporation, chemical vapor deposition, or spray pyrolysis methods.

[0033] The pixel definition layer 120 is disposed on the first electrode layer 130, and the pixel definition layer 120 includes a plurality of pixel openings. Among them, the pixel definition layer 120 may be formed by physical vapor deposition, chemical vapor deposition, or electrostatic inkjet. The pixel openings may be formed on the pixel definition layer 120 through photolithography and etching processes. If the pixel definition layer 120 adopts the electrostatic inkjet method, under the isolation of a fine mask plate, the pixel definition layer 120 including pixel openings can be directly prepared.

[0034] A cover layer 140 is disposed on the side of the pixel definition layer 120 away from the array substrate 110. The cover layer 140 may also be prepared by the electrostatic inkjet method. Under the isolation of a fine mask plate, the cover layer 140 is formed on the surface of the pixel definition layer 120. The cover layer 140 is made of a black material. The vertical projection of the cover layer 140 on the first electrode layer 130 at least partially covers the first electrode layer 130. That is to say, the black cover layer 140 can block part of the first electrode layer 130, thereby reducing the reflection area of the first electrode layer 130. And the black cover layer 140 can also absorb the external ambient light entering the display panel. The surface of the cover layer 140 away from the array substrate 110 has an uneven interface structure. For example, an uneven interface structure can be formed by plasma laser irradiation bombardment of the cover layer 140, or an uneven interface structure can be formed by applying a rough material when forming the cover layer 140, so as to diffuse part of the external ambient light through the uneven interface structure, thereby further reducing the influence of ambient light on the display panel.

[0035] The display panel further includes a light-emitting layer 160 and a second electrode layer 150. The light-emitting layer 160 is disposed within the pixel aperture. The first electrode layer 130 may include a plurality of first electrodes 131 spaced apart from each other. The first electrode 131 is electrically connected to a pixel driving circuit in the array substrate 110. Each light-emitting layer 160 within the pixel aperture is correspondingly electrically connected to the first electrode 131. Exemplarily, the light-emitting layer 160 may include an organic functional layer and a light-emitting material layer. The organic functional layer may include a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer stacked on top of each other. The light-emitting material layer is located between the hole transport layer and the electron transport layer. The second electrode layer 150 is disposed on a side of the light-emitting layer 160 away from the array substrate 110. Exemplarily, the second electrode layer 150 may be a cathode layer. The first electrode 131, the light-emitting layer 160, and the second electrode layer 150 in the first electrode layer 130 form a light-emitting device.

[0036] In the technical solution provided by the embodiment of the present invention, by providing a black covering layer on the surface of the pixel definition layer, the black covering layer is used to block a part of the first electrode layer, thereby reducing the reflection area of the first electrode layer, and the black covering layer can also absorb external ambient light entering the display panel. The surface of the covering layer away from the array substrate has an uneven interface structure, so that a part of the external ambient light is diffusely reflected by the uneven interface structure, thereby further reducing the influence of the ambient light on the display panel and improving the visual texture and display contrast of the display surface.

[0037] Optionally, continue to refer to Figure 1 , the covering layer 140 is a stacked structure formed by black polymer microspheres, and the stacked structure forms an uneven interface structure on the surface away from the array substrate 110.

[0038] Specifically, the cover layer 140 is prepared by electrostatic inkjet. Under the isolation of a fine mask plate, the cover layer 140 is formed on the surface of the pixel definition layer 120. The inkjet material can be black polymer microspheres. Among them, the black polymer microspheres can be obtained by adding materials such as polymethyl methacrylate (PMMA), isopropyl acetate, or epoxy acrylate with black organic dyes through the electrostatic inkjet process. The inkjet printing process is a process of stacking black polymer microspheres. After the printing is completed, a stacked structure formed by the black polymer microspheres is obtained. Exemplarily, the diameter of the black polymer microspheres is 10 - 200 nm. Due to the shape of the microspheres, the surface of the stacked structure away from the array substrate 110 forms an uneven interface structure. When external light irradiates on the black polymer microspheres on the panel, the incident light will be greatly absorbed, and due to the rough surface structure, diffuse reflection is formed, reducing the reflectivity of the display panel, improving the visual texture and contrast. In addition, due to its uneven interface structure itself, it can play a certain hydrophobic role, thereby improving the waterproof performance, and the black cover layer 140 can further enhance the integrated black effect of the display panel.

[0039] In some embodiments, Figure 2 is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Refer to Figure 2 , the pixel definition layer 120 and the cover layer 140 are an integrated structure. That is to say, the pixel definition layer 120 and the cover layer 140 are prepared simultaneously using the same material, thereby reducing the preparation steps of the cover layer 140. Thus, the pixel definition layer 120 and the cover layer 140 are collectively referred to as the pixel definition layer 120. The pixel definition layer 120 also uses a black material, and the black pixel definition layer 120 absorbs the external ambient light entering the display panel. And the surface of the pixel definition layer 120 away from the array substrate 110 has an uneven interface structure. For example, an uneven interface structure is formed by plasma laser irradiation bombardment of the cover layer 140, or an uneven interface structure can also be formed by applying rough materials while forming the cover layer 140. Thus, part of the external ambient light is diffusely reflected by the uneven interface structure, thereby further reducing the influence of the ambient light on the display panel.

[0040] Exemplarily, both the pixel definition layer 120 and the cover layer 140 are prepared by electrostatic inkjet printing. Under the isolation of a fine mask plate, an integrated structure of the pixel definition layer 120 and the cover layer 140 is formed. And under the isolation of the fine mask plate, the pixel definition layer 120 including pixel openings can be directly prepared. The inkjet material can also be black polymer microspheres. Among them, the black polymer microspheres can be obtained by adding black organic dyes to materials such as polymethyl methacrylate (PMMA), isopropyl acetate, or epoxy acrylate, and through the electrostatic inkjet process. The inkjet printing process is the process of stacking black polymer microspheres. After the printing is completed, the stacked structure formed by the black polymer microspheres is the integrated structure of the pixel definition layer 120 and the cover layer 140. Exemplarily, the diameter of the black polymer microspheres is 10 - 200 nm. The range of the sum of the thicknesses of the pixel definition layer 120 and the cover layer 140 is 0.3 - 1.5 μm. Due to the shape of the microspheres, the surface of the stacked structure away from the array substrate 110 forms an uneven interface structure. When external light irradiates on the panel, the black polymer microspheres will greatly absorb the incident light, and due to the rough surface structure, diffuse reflection is formed, reducing the reflectivity of the display panel, improving the visual texture and contrast. In addition, due to its uneven interface structure itself, it can play a certain hydrophobic role, thereby improving the waterproof performance. And the black cover layer 140 can further enhance the integrated black effect of the display panel.

[0041] Figure 3 The following is a schematic flowchart of a method for manufacturing a display panel provided by an embodiment of the present invention. With reference to Figure 1 , see Figure 3 , including:

[0042] S110. Form a first electrode layer on the array substrate;

[0043] Specifically, the array substrate 110 may include a substrate, a pixel circuit layer, and a metal wiring layer. Among them, the pixel circuit layer includes an active layer, a gate insulating layer, a gate layer, an interlayer insulating layer, and a source-drain layer; the metal wiring layer includes wiring layers such as signal lines, scan lines, power lines, capacitor electrodes, and gates. The metal wiring layer can be set as one layer or multiple layers. It should be noted that the stacked structure of the display panel provided in the embodiments of the present invention is only schematic and does not limit the structure of the display panel.

[0044] A first electrode layer 130 is formed on the array substrate 110. The material of the first electrode layer 130 can be one or more of indium tin oxide, indium zinc oxide, silver-doped indium tin oxide, and silver-doped indium zinc oxide. Then, the first electrode layer 130 is patterned to form a plurality of first electrodes 131. Exemplarily, photolithography and development techniques can be used for patterning the first electrode layer 130. For example, a photoresist is coated on the first electrode layer 130. The photoresist can be a positive or negative photoresist. In this embodiment of the present invention, a positive photoresist is taken as an example. The light source exposes the photoresist through a mask. The transparent part of the mask is decomposed. After development, the first electrode layer 130 is exposed. Then, the first electrode layer 130 is etched. Exemplarily, dry etching or wet etching can be used to etch the exposed area of the first electrode layer 130 to remove the photoresist, so that the first electrode layer 130 forms a plurality of first electrodes 131.

[0045] S120. A pixel defining layer is formed on the first electrode layer. The pixel defining layer is provided with a plurality of spaced pixel openings.

[0046] Specifically, the pixel defining layer 120 is disposed on the first electrode layer 130, and the pixel defining layer 120 includes a plurality of pixel openings. Among them, the pixel defining layer 120 can be formed by physical vapor deposition, chemical vapor deposition, or electrostatic inkjet. The pixel openings can be formed on the pixel defining layer 120 through photolithography and etching processes. If the pixel defining layer 120 is formed by electrostatic inkjet, under the isolation of a fine mask, the pixel defining layer 120 including pixel openings can be directly prepared.

[0047] S130. A covering layer is disposed on the side of the pixel defining layer away from the array substrate. The covering layer is made of a black material, and the surface of the covering layer away from the array substrate has an uneven interface structure.

[0048] Specifically, a covering layer 140 is disposed on the side of the pixel defining layer 120 away from the array substrate 110. The covering layer 140 is made of a black material. The vertical projection of the covering layer 140 on the first electrode layer 130 at least partially covers the first electrode layer 130. That is to say, the black covering layer 140 can block part of the first electrode layer 130, thereby reducing the reflection area of the first electrode layer 130. And the black covering layer 140 can also absorb the external ambient light entering the display panel. The surface of the covering layer 140 away from the array substrate 110 has an uneven interface structure. For example, an uneven interface structure can be formed by bombarding the covering layer 140 with plasma laser irradiation. It can also have an uneven interface structure by applying a rough material when forming the covering layer 140, so as to diffuse part of the external ambient light through the uneven interface structure, thereby further reducing the influence of ambient light on the display panel. Exemplarily, Figure 4A schematic diagram of the preparation process of a display panel provided by an embodiment of the present invention is shown in Figure 4 The cover layer 140 can be prepared by electrostatic inkjet. The material for electrostatic inkjet is black polymer microspheres. Under the isolation of the fine mask plate 410, a cover layer 140 with a stacked structure of black polymer microspheres is formed on the side of the pixel definition layer 120 away from the array substrate 110.

[0049] Figure 5 A schematic flowchart of another method for preparing a display panel provided by an embodiment of the present invention is shown in combination with Figure 2 shown in Figure 5 and includes:

[0050] S210. Form a first electrode layer on the array substrate;

[0051] S220. Form a pixel definition layer and a cover layer on the first electrode layer. The pixel definition layer and the cover layer are an integral structure and are made of the same material.

[0052] Specifically, the pixel definition layer 120 and the cover layer 140 are prepared simultaneously using the same material, thereby reducing the preparation steps of the cover layer 140. Thus, the pixel definition layer 120 and the cover layer 140 are collectively referred to as the pixel definition layer 120. The pixel definition layer 120 is also made of a black material, and the black pixel definition layer 120 absorbs external ambient light entering the display panel. Moreover, the surface of the pixel definition layer 120 away from the array substrate 110 has an uneven interface structure. For example, an uneven interface structure is formed by plasma laser irradiation bombardment of the cover layer 140, or an uneven interface structure can also be obtained by applying a rough material when forming the cover layer 140. Thus, a part of the external ambient light is diffusely reflected by the uneven interface structure, and the influence of ambient light on the display panel can be further reduced.

[0053] Exemplarily, Figure 6 A schematic diagram of the preparation process of a display panel provided by an embodiment of the present invention is shown in Figure 6, both the pixel definition layer 120 and the cover layer 140 are prepared by electrostatic inkjet. Under the isolation of the fine mask plate 410, an integrated structure of the pixel definition layer 120 and the cover layer 140 is formed. And under the isolation of the fine mask plate 410, the pixel definition layer 120 including pixel openings can be directly prepared. The material for electrostatic inkjet is black polymer microspheres. Under the isolation of the fine mask plate 410, a stacked structure of black polymer microspheres is formed on one side of the first electrode layer 130. The inkjet printing process is the process of stacking black polymer microspheres. After the printing is completed, the stacked structure formed by the black polymer microspheres is the integrated pixel definition layer 120 and cover layer 140. Exemplarily, the diameter of the black polymer microspheres is 10 - 200 nm. The range of the sum of the thicknesses of the pixel definition layer 120 and the cover layer 140 is 0.3 - 1.5 μm. Due to the shape of the microspheres, an uneven interface structure is formed on the surface of the stacked structure away from the array substrate 110. When external light irradiates on the panel, the black polymer microspheres will greatly absorb the incident light, and due to the rough surface structure, diffuse reflection is formed, reducing the reflectivity of the display panel, improving the visual texture and contrast. Additionally, due to its uneven interface structure itself, it can play a certain hydrophobic role, thereby improving the waterproof performance. And the black cover layer 140 can further enhance the integrated black effect of the display panel.

[0054] Figure 7 FIG. [X] is a schematic structural diagram of a display device provided by an embodiment of the present invention. Refer to Figure 7 , including the display panel 10 of any embodiment of the present invention. Figure 7 The display device shown is only for illustrative purposes. Among them, the display device may include: mobile phones, tablet computers, televisions, monitors, laptop computers, digital photo frames, navigators, and any other products or components with a display function, which are not limited herein. The specific beneficial effects of the display panel 10 have been described in detail in the above embodiments. This display device has the same beneficial effects as the above display panel, so they will not be repeated here.

[0055] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, Comprising: An array substrate, a pixel defining layer, a first electrode layer, and a covering layer; The first electrode layer is located on the array substrate, and the pixel defining layer is disposed on a side of the first electrode layer away from the array substrate; the pixel defining layer is provided with a plurality of spaced pixel openings; the covering layer is disposed on a side of the pixel defining layer away from the array substrate, the covering layer is made of a black material, and a surface of the covering layer away from the array substrate has an uneven interface structure.

2. The display panel according to claim 1, wherein The covering layer is a stacked structure formed by black polymer microspheres, and the stacked structure forms an uneven interface structure on a surface away from the array substrate.

3. The display panel according to claim 2, characterized in that, The pixel defining layer and the covering layer are an integral structure, and the pixel defining layer and the covering layer are a stacked structure formed by the black polymer microspheres.

4. The display panel according to any one of claims 2-3, characterized in that, The diameter of the black polymer microspheres is 10 - 200 nm.

5. The display panel according to any one of claims 2-3, characterized in that, The range of the sum of the thicknesses of the pixel defining layer and the covering layer is 0.3 - 1.5 μm.

6. The display panel according to claim 1, wherein Further comprising a light emitting layer and a second electrode layer; The light emitting layer is disposed in the pixel opening, and the second electrode layer is disposed on a side of the covering layer away from the array substrate, wherein the first electrode layer, the light emitting layer corresponding to the pixel opening, and the second electrode layer form a light emitting unit.

7. A method for manufacturing a display panel, characterized in that, Comprising: Forming a first electrode layer on the array substrate, Forming a pixel defining layer on the first electrode layer, the pixel defining layer being provided with a plurality of spaced pixel openings; A covering layer is disposed on a side of the pixel defining layer away from the array substrate, the covering layer is made of a black material, and a surface of the covering layer away from the array substrate has an uneven interface structure.

8. The manufacturing method of the display panel according to claim 7, wherein, Adopting an electrostatic inkjet method to spray and print black polymer microspheres on a side of the pixel defining layer away from the array substrate to form a stacked structure, and the stacked structure is the covering layer.

9. The method for manufacturing a display panel according to claim 7, wherein, Comprising: Adopting an electrostatic inkjet method to spray and print black polymer microspheres on a side of the first electrode layer away from the array substrate to form a stacked structure, the stacked structure being the pixel defining layer and the covering layer, and the pixel defining layer and the covering layer being an integral structure.

10. A display device, characterized in that, Comprising the display panel according to any one of claims 1 - 6.

Images