CN114023799A

CN114023799A - Display panel, manufacturing method of display panel and display device

Info

Publication number: CN114023799A
Application number: CN202111274503.4A
Authority: CN
Inventors: 吴倩
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-02-08

Abstract

The application provides a display panel, a manufacturing method of the display panel and a display device, wherein the display panel comprises: an array substrate; the light emitting functional layer is arranged on the array substrate; the packaging cover plate is arranged on the light-emitting functional layer, and the packaging cover plate and the array substrate are bonded by packaging glue; one surface, facing the light-emitting functional layer, of the packaging cover plate is provided with a plurality of first grooves, two adjacent first grooves are arranged at intervals, curing glue is arranged in each first groove, modified nanoparticles are doped in the curing glue, and the modified nanoparticles are dispersed in the curing glue. Through set up a plurality of first recesses on the encapsulation apron, be provided with the solidification of having adulterated modified nano particle in every first recess and glue to make luminous functional layer circular telegram back, when light was outwards jetted out through the encapsulation apron, the light through modified nano particle can take place to realize after several refractions front view and look sideways at the light-emitting, and is favorable to widening display panel's light-emitting angle of divergence, improves display panel's luminance and visual angle performance.

Description

Display panel, manufacturing method of display panel and display device

Technical Field

The present disclosure relates to the field of display device technologies, and in particular, to a display panel, a method for manufacturing the display panel, and a display device.

Background

Organic electroluminescent diode (OLED) Display panels are widely used due to their excellent characteristics, such as high brightness, high efficiency, wide viewing angle, and self-luminescence.

However, the OLED display panel mostly adopts a top emission mode, and most of light cannot be extracted effectively due to refraction or reflection inside the OLED display panel, resulting in more light loss, and causing a large difference in brightness of the display panel at different angles, resulting in a poor viewing angle of the display panel.

At present, a common method for improving the brightness viewing angle is to paste a film layer on the surface of a device, but the film layer is not easy to paste, the film layer is expensive, the film layer can increase the overall thickness of the device, and the like, so that the film layer can be limited in future application, and is not beneficial to the actual production needs of display panels.

Disclosure of Invention

The application provides a display panel, a manufacturing method of the display panel and a display device, which are used for solving the problem that the visual angle performance of the display panel is poor.

In one aspect, the present application provides a display panel, comprising:

an array substrate;

the light emitting functional layer is arranged on the array substrate;

the packaging cover plate is arranged on the light-emitting functional layer, and the packaging cover plate and the array substrate are bonded by packaging glue;

one side of the packaging cover plate is provided with a plurality of first grooves, two adjacent first grooves are arranged at intervals, curing glue is arranged in each first groove, modified nano particles are doped in the curing glue, and the modified nano particles are dispersed in the curing glue.

In a possible implementation manner of the present application, a second groove is further disposed on a surface of the package cover plate facing the light-emitting functional layer, the second groove is communicated with the first groove, the first groove is disposed on a bottom wall of the second groove, and a notch of the second groove is opposite to the light-emitting functional layer;

the notch of the first groove and the light-emitting functional layer are arranged at intervals to form a buffer layer.

In one possible implementation of the present application, the buffer layer is a vacuum cavity structure or a solid structure.

In one possible implementation manner of the present application, a plurality of the first grooves are arranged along a first direction and/or a second direction, and the first direction and the second direction intersect.

In one possible implementation manner of the present application, the depth of the first groove ranges from 1 μm to 6 μm, the width ranges from 1 μm to 6 μm, and the interval between two adjacent first grooves ranges from 8 μm to 11 μm.

In one possible implementation of the present application, the refractive index of the modified nanoparticles is greater than or equal to 1.7.

In one possible implementation manner of the present application, the doping concentration range of the modified nanoparticles in the curing adhesive is 1% to 10%.

In one possible implementation manner of the present application, the light emitting functional layer includes an anode, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer, and a cathode, which are sequentially stacked.

On the other hand, the application also provides a manufacturing method of the display panel, which comprises the following steps:

providing an array substrate;

manufacturing a light-emitting functional layer on the array substrate;

providing a packaging cover plate;

etching one side of the packaging cover plate to form a plurality of first grooves, wherein every two adjacent first grooves are arranged at intervals;

coating the modified nano-particle-doped curing glue in the first groove and curing the curing glue;

and covering the packaging cover plate on the luminous functional layer, and bonding the array substrate and the packaging cover plate by packaging glue.

On the other hand, the application also provides a display device which comprises the display panel.

The application provides a pair of display panel, display panel's manufacturing method and display device sets up a plurality of first recesses, every through the one side of orientation luminous functional layer on the encapsulation apron be provided with the solidification in the first recess and glue, the solidification is mixed with dispersive modified nano particle in gluing to make luminous functional layer circular telegram back, light passes through when encapsulation apron is toward outwards penetrating out, process realize the front view after the light of modified nano particle can take place refraction several times and look sideways at the light-emitting, thereby can be under the prerequisite that does not additionally increase display panel thickness, be favorable to widening display panel's light-emitting divergence angle, improve display panel's luminance and visual angle performance.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present application.

Fig. 2 is a schematic top view of a package cover according to an embodiment of the present disclosure.

Fig. 3 is a schematic top view of a package cover according to another embodiment of the present disclosure.

Fig. 4 is a schematic top view of a package cover according to another embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view of a package cover according to yet another embodiment of the present application.

Fig. 6 is a schematic structural diagram of a display panel according to yet another embodiment of the present application.

Fig. 7 is a schematic view of a manufacturing process of a display panel according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the features of the terms "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Embodiments of the present invention provide a display panel, a method for manufacturing the display panel, and a display device, which are described in detail below.

Referring to fig. 1 to 6, an embodiment of the present invention provides a display panel including an array substrate 100, a light emitting functional layer 200, and a package cover 300.

The array substrate 100 may be a Thin Film Transistor (TFT) substrate, and mainly functions to control a pixel circuit. The substrate of the base plate may be, but is not limited to, glass and flexible Polyimide (PI). Specifically, the active layer material of the TFT device may be, but is not limited to, LTPS (Low Temperature Poly-silicon), LTPO (Low Temperature Polycrystalline Oxide), Indium Gallium Zinc Oxide (IGZO), amorphous silicon (a-Si), and the like.

The light emitting functional layer 200 is disposed on the array substrate 100, and the light emitting functional layer 200 is used for realizing light emission of the display panel.

The package cover 300 is disposed on the light emitting functional layer 200, and the package cover 300 and the array substrate 100 are bonded by a package adhesive 400. The package cover 300 may be a transparent glass cover.

One side of the package cover 300 is provided with a plurality of first grooves 301. Specifically, in this embodiment, the first grooves are disposed on a surface of the package cover 300 facing the light-emitting functional layer 200.

Two adjacent first grooves 301 are arranged at intervals, a curing adhesive 320 is arranged in each first groove 301, modified nanoparticles 310 are doped in the curing adhesive 320, and the modified nanoparticles 310 are nanoparticles which can be uniformly dispersed in the curing adhesive 320, that is, the modified nanoparticles 310 do not settle or gather in the curing adhesive 320, so that light can be uniformly emitted.

The curing glue 320 is a transparent glue material which is not easy to melt after curing, and the curing glue 320 can be optical glue such as UV glue and thermosetting glue.

The display panel of the embodiment of the application sets up a plurality of first recesses 301, every through the one side of going to luminous functional layer 200 on encapsulation apron 300 be provided with in the first recess 301 and solidify and glue 320, it has dispersed modified nanoparticle 310 to solidify to mix in the glue 320 to make luminous functional layer 200 circular telegram back, light passes through when encapsulation apron 300 jets out outward the light of modified nanoparticle 310 can take place to realize after several refractions front view and look sideways at the light-emitting, thereby can be under the prerequisite that does not additionally increase display panel thickness, be favorable to widening display panel's light-emitting divergence angle, improve display panel's luminance and visual angle performance.

In some embodiments, the modified nanoparticles 310 have a refractive index greater than or equal to 1.7. Specifically, the Refractive Index (RI) of the modified nanoparticle 310 may be 1.7, may be 2, may be 3, and the like. The modified nanoparticles 310 include, but are not limited to, zirconium dioxide (ZrO2), titanium dioxide (TiO2), silicon dioxide (SiO2), zinc oxide (ZnO), barium oxide (BaO), calcium oxide (CaO), and the like. Through setting up modified nano particle 310's refractive index scope to can be in the light quantity under the increase side viewing angle, thereby when reducing the colour cast of different visual angles, guaranteed that display panel has the wider range of selecting materials, be favorable to having reduced display panel's cost of manufacture.

In some embodiments, the doping concentration of the modified nanoparticles 310 in the curing glue 320 ranges from 1% to 10%. Specifically, the modified nanoparticles 310 may be doped in the curing glue 320 at a concentration of, for example, 1%, 5%, 10%, etc. It can be understood that, since the particle diameters of different nanoparticles are different and the refractive indexes are different, the different concentrations of the modified nanoparticles 310 in the curing adhesive 320 can make the display panel adapt to the improvement requirements of different brightnesses and different viewing angles, which is beneficial to improving the display uniformity.

In some embodiments, the light emitting function layer 200 includes an anode 210, a hole injection layer 220, a hole transport layer 230, an organic light emitting layer 240, an electron transport layer 260, an electron injection layer 250, and a cathode 270, which are sequentially stacked.

The hole injection layer 220 and the hole transport layer 230(HTL) may be an organic hole transport layer 230, the hole transport layer 230 has a hole carrier transport function, the organic light emitting layer 240(EML) is used for enabling each pixel point to emit red/green/blue light, the organic light emitting layer 240, the hole injection layer 220, and the hole transport layer 230 may be manufactured by an inkjet Printing process, and the inkjet Printing formed organic light emitting diode (ik-Jet Printing OLED, IJP OLED) has characteristics of active light emission, low energy consumption, high color gamut, high contrast, zero retardation, transparent display, flexible display, free display form, and the like.

Of course, the organic light emitting layer 240, the hole injection layer 220, and the hole transport layer 230 may also be formed by an evaporation process, and are not limited herein.

The electron injection layer 250(EIL) material may include, but is not limited to, an inorganic material having a lower vacuum level or an organic material having a lower LUMO or other organic doping material.

The anode 210 is fabricated on the array substrate 100, and the material of the anode 210 can be, but not limited to, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), silver (Ag), and other Transparent Conductive Oxides (TCO). The thickness of the anode 210 may range from 10-50 nm. As the Cathode 270(Cathode), a metal which is not easily oxidized, has excellent conductivity and high reflectivity, such as silver (Ag), aluminum (Al), gold (Au), copper (Cu), molybdenum (Mo), or titanium (Ti), can be used. The thickness of the cathode 270 may be 50 to 200nm, and is not particularly limited thereto.

Specifically, under a certain voltage driving, electrons and holes are injected from the cathode 270 and the anode 210 to the electron transport layer 260 and the hole transport layer 230, respectively, and the electrons and the holes migrate to the organic light emitting layer 240 through the electron transport layer 260 and the hole transport layer 230, respectively, and meet in the organic light emitting layer 240, forming excitons and exciting light emitting molecules, which emit visible light through radiative relaxation.

In some embodiments, a second groove 302 is further disposed on a side of the package cover plate 300 facing the light-emitting functional layer 200, the second groove 302 is communicated with the first groove 301, the first groove 301 is disposed on a bottom wall of the second groove 302, a notch of the second groove 302 is disposed opposite to the light-emitting functional layer 200, and a notch of the first groove 301 and the light-emitting functional layer 200 are disposed at an interval to form a buffer layer 330. The thickness of the buffer layer 330 may be in a range of 4-8 μm, and the buffer layer 330 may be 4 μm, 6 μm, 8 μm, or the like. The buffer layer 330 may be used to prevent the package cover 300 from being damaged by external force, such as compression, on the light emitting functional layer 200, especially on the cathode 270, thereby protecting the light emitting functional layer.

In some embodiments, the buffer layer 330 is a hollow structure or a solid structure. The buffer layer may be spherical, massive, or the like. When the buffer layer 330 is a solid structure, the buffer layer 330 may be made of a material having good elasticity, such as Polyurethane (PU), thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), polyamide thermoplastic elastomer, and the like, so as to play a role in buffer protection.

In some embodiments, a plurality of the first grooves 301 are arranged along a first direction X and/or a second direction Y, the first direction X and the second direction Y crossing each other. In this embodiment, the first direction X and the second direction Y may be directions perpendicular to each other, specifically, the first direction X may be a horizontal direction, and the second direction Y may be a vertical direction. Specifically, referring to fig. 2 to 4, the plurality of first grooves 301 may be disposed on the entire surface of the package cover 300, or may be disposed on a part of the package cover 300, for example, only on the edge of the package cover 300 or only in the middle of the package cover 300, and the like, and different disposing manners of the plurality of first grooves 301 on the package cover 300 may enable the display panel to meet the requirements of improving different brightness and different viewing angles, which is beneficial to improving display uniformity.

In some embodiments, the first grooves 301 have a depth in a range of 1-6 μm and a width in a range of 1-6 μm, and two adjacent first grooves 301 are spaced apart by a distance in a range of 8-11 μm. Illustratively, the interval range of two adjacent first grooves 301 may be 10 μm. Specifically, as shown in fig. 5, since there are a plurality of first grooves 301, wherein parameters such as depth, width, and distance of each first groove 301 may be the same or different, and different parameter settings of the plurality of first grooves 301 on the package cover 300 may enable the display panel to adapt to different brightness and different viewing angle improvement requirements, which is beneficial to improving display uniformity. Each parameter corresponding to different first grooves 301 may be partially the same or different, and is not limited herein. For example, the depths of the different first grooves 301 may be different, and the widths of the different first grooves 301 may also be different.

Referring to fig. 7, an embodiment of the present application further provides a method for manufacturing a display panel, including the following step S10-step:

s10, providing an array substrate 100. The array substrate 100 is a Thin Film Transistor (TFT) array substrate 100.

S20, fabricating a light emitting functional layer 200 on the array substrate 100.

S30, providing a package cover 300. Wherein, the encapsulation apron is transparent glass apron.

S40, etching on one side of the package cover plate 300 to form a plurality of first grooves 301, wherein two adjacent first grooves 301 are arranged at intervals.

Specifically, before the step S40, a second groove 302 may be formed by etching on one side of the package cover plate 300, and the plurality of first grooves 301 are etched in the bottom wall of the second groove 302.

S50, coating the curing glue 320 doped with the modified nano-particles 310 in the first groove 301 and curing the curing glue 320.

S60, covering the light emitting functional layer 200 with the package cover 300, and adhering the array substrate 100 and the package cover 300 with a package adhesive 400.

The manufacturing method of the display panel provided by the embodiment of the application is characterized in that a plurality of first grooves 301 are formed in one face, facing the luminous functional layer 200, of the packaging cover plate 300, curing glue 320 is arranged in each first groove 301, dispersed modified nanoparticles 310 are doped in the curing glue 320, so that after the luminous functional layer 200 is electrified, light passes through the packaging cover plate 300 when the light is emitted outwards, the modified nanoparticles 310 are refracted for several times, and then the front view and the side view light are realized, so that the light emitting divergence angle of the display panel can be widened on the premise that the thickness of the display panel is not additionally increased, and the brightness and the visual angle performance of the display panel are improved.

The embodiment of the application also provides a display device, and the display device comprises the display panel. Since the display device has the display panel, all the same advantages are achieved, and the description of the embodiment is omitted. The embodiment of the application is not specifically limited to the application of the display device, and the display device can be any product or part with a display function, such as a television, a notebook computer, a tablet computer, wearable display equipment (such as an intelligent bracelet, an intelligent watch and the like), a mobile phone, virtual reality equipment, augmented reality equipment, vehicle-mounted display, an advertising lamp box and the like.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing method embodiment, which is not described herein again.

The display panel, the manufacturing method of the display panel, and the display device provided in the embodiments of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the implementation manner of the embodiments of the present application, and the description of the embodiments above is only used to help understanding the technical solution and the core idea of the embodiments of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel, comprising:

an array substrate;

the light emitting functional layer is arranged on the array substrate;

2. The display panel according to claim 1, wherein a plurality of the first grooves are arranged in a first direction and/or a second direction, and wherein the first direction and the second direction intersect.

3. The display panel according to claim 2, wherein the first grooves have a depth in a range of 1-6 μm, a width in a range of 1-6 μm, and a distance between two adjacent first grooves is in a range of 8-11 μm.

4. The display panel according to claim 1, wherein a second groove is further formed in a surface of the package cover plate facing the light-emitting functional layer, the second groove is communicated with the first groove, the first groove is formed in a bottom wall of the second groove, and a notch of the second groove is opposite to the light-emitting functional layer;

5. The display panel according to claim 4, wherein the buffer layer is a cavity structure or a solid structure.

6. The display panel of claim 1 wherein the modified nanoparticles have a refractive index greater than or equal to 1.7.

7. The display panel of claim 1, wherein the modified nanoparticles have a doping concentration in the cured glue in the range of 1% to 10%.

8. The display panel according to any one of claims 1 to 7, wherein the light-emitting functional layer comprises an anode, a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, an electron injection layer, and a cathode, which are stacked in this order.

9. A method for manufacturing a display panel is characterized by comprising the following steps:

providing an array substrate;

manufacturing a light-emitting functional layer on the array substrate;

providing a packaging cover plate;

10. A display device characterized by comprising the display panel according to any one of claims 1 to 8.