WO2020151048A1

WO2020151048A1 - Light-emitting panel, preparation method thereof, and display device

Info

Publication number: WO2020151048A1
Application number: PCT/CN2019/076686
Authority: WO
Inventors: 杨中国
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2019-01-25
Filing date: 2019-03-01
Publication date: 2020-07-30
Also published as: CN109888121A

Abstract

A light-emitting panel (100), a preparation method of the light-emitting panel (100), and a display device (1000), wherein the light-emitting panel (100) comprises a light-emitting substrate (10), a first bonding layer (20), a second bonding layer (30) and a cover plate (40), which are sequentially stacked from bottom to top; wherein, a water adsorbing layer (50) is arranged between the first bonding layer (20) and the second bonding layer (30), the water adsorbing layer (50) is of a closed structure. Arranging the water adsorbing layer (50) as a closed structure improves the light transmittance of the light-emitting panel (100).

Description

Light-emitting panel, preparation method of light-emitting panel and display device

Technical field

This application relates to the field of display technology, in particular to a light-emitting panel, a method for manufacturing the light-emitting panel, and a display device.

Background technique

In recent years, the development of Organic Light Emitting Diode (OLED) display technology has advanced by leaps and bounds. OLED products have received more and more attention and applications due to their light and thin, fast response, wide viewing angle, high contrast, and flexibility. , Mainly used in display technology fields such as mobile phones, tablets, and TVs.

In the prior art, when the light-emitting panel is packaged, a surface-attached packaging method is mainly used, and the packaging material is mainly composed of a barrier film and a surface-attached packaging adhesive. The surface-laminated encapsulant material used for bottom light emission contains metal oxide particles as a water-absorbing desiccant. Due to its large particle size, the plastic material has a low transmittance.

Therefore, the existing technology has shortcomings and is in urgent need of improvement.

technical problem

The embodiments of the present application provide a light-emitting panel, a method for manufacturing the light-emitting panel, and a display device, which can improve the light transmittance of the light-emitting panel.

Technical solutions

In the first aspect, an embodiment of the present application provides a light emitting panel, including:

The light-emitting substrate, the first adhesive layer, the second adhesive layer and the cover plate are stacked in sequence from bottom to top; wherein,

A water-absorbing layer is arranged between the first adhesive layer and the second adhesive layer, and the water-absorbing layer has a closed structure.

In the light-emitting panel described in the present application, the outer edge of the water-absorbing layer and the outer edge of the first adhesive layer are in the same cross-section.

In the light-emitting panel described in the present application, the horizontal length of the orthographic projection of the water-absorbing layer on the first adhesive layer is smaller than the horizontal width of the first adhesive layer.

In the light-emitting panel described in the present application, the water-absorbing layer is doped with desiccant particles, and the desiccant particles are composed of metal oxide.

In the light-emitting panel described in this application, the first adhesive layer, the second adhesive layer, and the water-absorbing layer are made of hyposensitive adhesive material or heat-sensitive adhesive material.

In the light-emitting panel described in the present application, the vertical thickness of the water-absorbing layer is less than half of the sum of the vertical thickness of the first adhesive layer and the second adhesive layer.

In a second aspect, an embodiment of the present application also provides a method for manufacturing a light-emitting panel, including:

Provide a cover;

A second adhesive layer, a water-absorbing layer, and a first adhesive layer are sequentially formed on the cover plate, and the water-absorbing layer is a closed structure;

Provide a light-emitting substrate;

The light-emitting substrate is attached to the second adhesive layer relative to the cover plate.

In the method for manufacturing the light-emitting panel described in the present application, the step of sequentially forming a second adhesive layer, a water-absorbing layer, and a first adhesive layer on the cover plate includes:

Provide an encapsulation adhesive material, the encapsulation adhesive material includes a first cover plate, a first adhesive layer, a water absorption layer, a second adhesive layer, and a second cover plate;

Removing the first cover plate, and attaching the second adhesive layer to the cover plate;

The second release film is removed, and the light-emitting substrate is attached to the first adhesive layer relative to the cover plate.

In the manufacturing method of the light emitting panel described in the present application, the steps of removing the second release film and attaching the light emitting substrate to the cover plate on the first adhesive layer include :

An inorganic water blocking layer is formed on the light-emitting substrate, so that the inorganic water blocking layer and the first adhesive layer are bonded together.

In a third aspect, an embodiment of the present application further provides a display device, including: a housing and a light-emitting panel, the light-emitting panel is disposed on the housing, and the light-emitting panel includes:

A water-absorbing layer is arranged between the first adhesive layer and the second adhesive layer, the water-absorbing layer is a closed structure, the water-absorbing layer is doped with desiccant particles, and the desiccant particles are made of metal It is composed of oxides, and the particle size of the desiccant particles is less than 6 microns.

In the display device of the present application, the outer edge of the water-absorbing layer and the outer edge of the first adhesive layer are in the same cross-section.

In the display device of the present application, the horizontal length of the orthographic projection of the water-absorbing layer on the first adhesive layer is smaller than the horizontal width of the first adhesive layer.

In the display device described in the present application, the first adhesive layer, the second adhesive layer, and the water-absorbing layer are made of a hyposensitive adhesive material or a heat-sensitive adhesive material.

In the display device described in the present application, the vertical thickness of the water-absorbing layer is less than half of the sum of the vertical thickness of the first adhesive layer and the second adhesive layer.

Beneficial effect

The light-emitting panel provided by the embodiment of the present application includes a light-emitting substrate, a first adhesive layer, a second adhesive layer, and a cover plate that are stacked in sequence from bottom to top; wherein, the first adhesive layer and the second adhesive layer A water-absorbing layer is arranged between the adhesive layers, and the water-absorbing layer is a closed structure, and the light transmittance of the light-emitting panel is improved by setting the water-absorbing layer in a closed structure.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a display device provided by an embodiment of the application.

FIG. 2 is a schematic diagram of the first structure of a light emitting panel provided by an embodiment of the application.

FIG. 3 is a schematic diagram of a second structure of a light-emitting panel provided by an embodiment of the application.

FIG. 4 is a schematic diagram of a third structure of a light emitting panel provided by an embodiment of the application.

FIG. 5 is a schematic diagram of a fourth structure of a light emitting panel provided by an embodiment of the application.

FIG. 6 is a schematic diagram of a fifth structure of a light emitting panel provided by an embodiment of the application.

FIG. 7 is a flowchart of a method for manufacturing a light-emitting panel provided by an embodiment of the application.

Embodiments of the invention

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of this application.

In the prior art, the main packaging methods for top-emitting large-size organic light emitting diode (Organic Light Emitting Diode, OLED) TVs mainly include Face Seal (surface mount packaging) and Dam (frame glue)/Getter (moisture absorbent)/Fill( Filling glue) package. For the existing Face Seal encapsulant for bottom light, its structure is divided into two layers, the first layer is a water-absorbing layer, which contains metal oxide particles as a water-absorbing desiccant, and its particle size is 1 to 6 microns On the left and right, the second layer is a buffer layer, which is mainly used for bonding the substrate, absorbing impact and protecting the OLED light-emitting layer. Obviously, the existing Face Seal encapsulant materials cannot be used in top-emitting OLEDs, because the water-absorbing layer contains desiccant particles, and the transmittance is less than 5%, which cannot meet the top-emitting requirements for a transmittance greater than 98%. The current solution is to replace the micron-sized desiccant particles with nano-sized desiccant particles, or replace the opaque desiccant particles with light-transmitting desiccant particles, although the transmittance of these two methods can be satisfied Requirement, but the package life cannot reach the mass production level during packaging.

An embodiment of the application provides a display device, which includes a housing and a light-emitting panel, the light-emitting panel is disposed on the housing, and the light-emitting panel includes:

Wherein, the outer edge of the water-absorbing layer and the outer edge of the first adhesive layer are in the same cross-section.

Wherein, the horizontal length of the orthographic projection of the water-absorbing layer on the first adhesive layer is smaller than the horizontal width of the first adhesive layer.

Wherein, the first adhesive layer, the second adhesive layer, and the water-absorbing layer are made of hyposensitive adhesive material or heat-sensitive adhesive material.

Wherein, the vertical thickness of the water-absorbing layer is less than half of the sum of the vertical thickness of the first adhesive layer and the second adhesive layer.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a display device 1000 according to an embodiment of the application. The display device 100 may include a light emitting panel 100, a control circuit 200, and a housing 300. It should be noted that the display device 1000 shown in FIG. 1 is not limited to the above content, and may also include other devices, such as a camera, an antenna structure, a pattern unlocking module, and the like.

Wherein, the light-emitting panel 100 is disposed on the housing 200.

In some embodiments, the light-emitting panel 100 may be fixed to the housing 200, and the light-emitting panel 100 and the housing 300 form a closed space to accommodate devices such as the control circuit 200.

In some embodiments, the housing 300 may be made of a flexible material, such as a plastic housing or a silicone housing.

Wherein, the control circuit 200 is installed in the housing 300, the control circuit 200 may be the main board of the display device 1000, and the control circuit 200 may be integrated with a battery, an antenna structure, a microphone, a speaker, a headset interface, a universal serial bus interface, One, two or more of functional components such as camera, distance sensor, ambient light sensor, receiver, and processor.

Wherein, the light-emitting panel 100 is installed in the housing 300, and at the same time, the light-emitting panel 100 is electrically connected to the control circuit 200 to form the display surface of the display device 1000. The light emitting panel 100 may include a display area and a non-display area. The display area can be used to display the screen of the display device 1000 or for the user to perform touch manipulation. This non-display area can be used to set various functional components.

Please refer to FIG. 2, which is a schematic diagram of a first structure of a light-emitting panel provided by an embodiment of the application. The light-emitting panel 100 includes: a light-emitting substrate 10, a first adhesive layer 20, and a second adhesive layered in order from bottom to top. Connecting layer 30 and cover plate 40; among them,

A water-absorbing layer 50 is provided between the first adhesive layer 20 and the second adhesive layer 30, and the water-absorbing layer 50 has a closed structure.

It is understandable that when the OLED is encapsulated, the effective encapsulation area AA is outside the light-emitting area of the light-emitting substrate 10, so only the desiccant on the outside can absorb water, and the desiccant on the light-emitting area is not It plays a role of absorbing water. Therefore, a circle of water absorbing layer 50 can be smeared on the first adhesive layer 20. The water absorbing layer 50 is arranged corresponding to the effective area AA of the package, so that the water absorbing layer 50 forms a closed structure with a hollow in the middle. When the light-emitting area on the substrate 10 emits light, light can be emitted from the hollowed-out part of the water-absorbing layer 50, thereby increasing the light transmittance of the light-emitting panel.

The light-emitting panel 100 provided by the embodiment of the present application includes a light-emitting substrate 10, a first adhesive layer 20, a second adhesive layer 30, and a cover plate 40 that are sequentially stacked from bottom to top; wherein, the first adhesive layer A water absorbing layer 50 is provided between the second adhesive layer 30 and 20. The water absorbing layer 50 is a closed structure. The light transmittance of the light emitting panel 100 is improved by setting the water absorbing layer 50 in a closed structure.

In some embodiments, an inorganic water blocking layer 60 is further provided between the light-emitting substrate 10 and the first adhesive layer 20. A color film 70 is also provided between the cover plate 40 and the second adhesive layer 30.

In some embodiments, as shown in FIG. 3, FIG. 3 is a schematic diagram of the second structure of the light-emitting panel provided by the embodiment of the application. Among them, FIG. 3 is a top view of the light emitting panel 100 shown in FIG. 2. The horizontal length of the orthographic projection of the water-absorbing layer 50 on the first adhesive layer 20 is smaller than the horizontal width of the first adhesive layer 20.

It can be understood that the water-absorbing layer 50 may be disposed inside the first adhesive layer 20 so that at least a part of the outside of the first adhesive layer 20 is exposed. The inner side here refers to the side close to the central axis of the light-emitting panel 100, and the outer side refers to the side far away from the central axis of the light-emitting panel 100.

In some embodiments, as shown in FIG. 4 and FIG. 5, FIG. 4 is a schematic diagram of a third structure of a light emitting panel provided by an embodiment of the application. FIG. 5 is a schematic diagram of a fourth structure of a light emitting panel provided by an embodiment of the application. FIG. 5 is a top view of the light-emitting panel 100 in FIG. 4. The outer edge of the water-absorbing layer 50 and the outer edge of the first adhesive layer 20 are in the same cross-section.

Specifically, the water-absorbing layer 50 may be disposed on the peripheral area of the first adhesive layer 20 to cover the peripheral area of the first adhesive layer 20.

In some embodiments, the water absorption layer 50 is doped with desiccant particles, and the desiccant particles are composed of metal oxide.

Wherein, the first adhesive layer 20 and the second adhesive layer 30 are uniformly dispersed with nano-scale desiccant particles (such as nano molecular sieve) or transparent desiccant particles.

It can be understood that in order to improve the water blocking performance of the first bonding layer 20 and the second bonding layer 30, the micron-level desiccant particles can be replaced with nano-level desiccant particles, or the opaque desiccant particles can be replaced It is a light-transmitting desiccant particle, which further improves the packaging effect while ensuring the transmittance.

Wherein, the composition of the desiccant is a metal oxide, such as calcium oxide (CaO) or barium oxide (BaO), etc. The particle size of the desiccant particles is less than 6 microns, which can prevent water vapor from entering the OLED from the side, thereby satisfying The requirements for the package life during packaging. At the same time, the average transmittance of the first adhesive layer 20 and the second adhesive layer 30 in the full wavelength range (380~780 nm) is greater than 98%, which meets the transmittance requirements of the top luminescence .

In some embodiments, the first adhesive layer 20, the second adhesive layer 30, and the water-absorbing layer 50 are hyposensitive adhesives or heat-sensitive adhesives.

In some embodiments, the vertical thickness of the water-absorbing layer 50 is less than half of the sum of the vertical thicknesses of the first adhesive layer 20 and the second adhesive layer 30.

Specifically, the vertical thickness of the first adhesive layer 20 and the second adhesive layer 30 is 10-50 microns, and the vertical thickness of the water-absorbing layer 50 is 10-50 microns.

In some embodiments, as shown in FIG. 6, FIG. 6 is a schematic diagram of the fifth structure of the light emitting panel provided by the embodiments of the application. FIG. 6 is a specific structure diagram of the light-emitting substrate 10 in FIG. 2. The light-emitting substrate 10 includes a base 101 and an OLED device 102 partially covering the base 101.

The embodiment of the present application also provides a method for manufacturing the light-emitting panel, which is used to prepare the light-emitting panel as described above. Please refer to FIG. 7. FIG. 7 is a flowchart of a method for manufacturing a light-emitting panel provided by an embodiment of the application. The method for manufacturing the light-emitting panel includes:

110. Provide a cover;

In some embodiments, a color film may be formed on the cover plate.

120. A second adhesive layer, a water-absorbing layer, and a first adhesive layer are sequentially formed on the cover plate, and the water-absorbing layer has a closed structure;

In some embodiments, the color film can be attached to the second adhesive layer.

130. Provide a light-emitting substrate;

140. Adhere the light-emitting substrate to the first adhesive layer relative to the cover plate.

In some embodiments, the step of sequentially forming a second adhesive layer, a water-absorbing layer, and a first adhesive layer on the cover plate includes:

Provide an encapsulation adhesive material, the encapsulation adhesive material includes a first release film layer, a first adhesive layer, a water absorption layer, a second adhesive layer, and a second release film layer;

Removing the first release film layer, and attaching the second adhesive layer to the cover plate;

Here, a circle of water-absorbing layer is coated on the first adhesive layer, where the outer edge of the water-absorbing layer formed by coating is flush with or inside the outer edge of the adhesive layer. The specific coating position of the water-absorbing layer here depends on the effective area of the package during packaging.

In some embodiments, the step of removing the second release film and attaching the light-emitting substrate to the first adhesive layer relative to the cover plate further includes:

Specifically, the operation of attaching the light-emitting substrate to the first adhesive layer is performed in a vacuum environment.

Finally, the first adhesive layer and the second adhesive layer are cured by hot pressing or heating to complete the package.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in an embodiment, reference may be made to related descriptions of other embodiments.

The light-emitting panel, the manufacturing method of the light-emitting panel, and the display device provided by the embodiments of the application are described in detail above. Specific examples are used in this article to illustrate the principles and implementations of the application. The description of the above embodiments is only It is used to help understand the technical solutions of the present application and its core ideas; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features; and These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

A light-emitting panel, which includes:

The light-emitting substrate, the first adhesive layer, the second adhesive layer and the cover plate are stacked in sequence from bottom to top; wherein,

A water-absorbing layer is arranged between the first adhesive layer and the second adhesive layer, and the water-absorbing layer has a closed structure.
The light emitting panel according to claim 1, wherein the outer edge of the water absorption layer and the outer edge of the first adhesive layer are in the same cross section.
The light emitting panel according to claim 1, wherein the horizontal length of the orthographic projection of the water-absorbing layer on the first adhesive layer is smaller than the horizontal width of the first adhesive layer.
The light emitting panel according to claim 1, wherein the water-absorbing layer is doped with desiccant particles, and the desiccant particles are composed of metal oxide.
The light-emitting panel according to claim 1, wherein the first adhesive layer, the second adhesive layer, and the water-absorbing layer are made of a sub-sensitive adhesive material or a heat-sensitive adhesive material.
The light emitting panel according to claim 5, wherein the vertical thickness of the water absorption layer is less than half of the sum of the vertical thickness of the first adhesive layer and the second adhesive layer.
A method for manufacturing a light-emitting panel includes:

Provide a cover;

A second adhesive layer, a water-absorbing layer, and a first adhesive layer are sequentially formed on the cover plate, and the water-absorbing layer is a closed structure;

Provide a light-emitting substrate;

The light-emitting substrate is attached to the first adhesive layer relative to the cover plate.
8. The method of manufacturing a light-emitting panel according to claim 7, wherein the step of sequentially forming a second adhesive layer, a water-absorbing layer and a first adhesive layer on the cover plate comprises:

Provide an encapsulation adhesive material, the encapsulation adhesive material includes a first release film layer, a first adhesive layer, a water absorption layer, a second adhesive layer, and a second release film layer;

Removing the first release film layer, and attaching the second adhesive layer to the cover plate;

The second release film is removed, and the light-emitting substrate is attached to the first adhesive layer relative to the cover plate.
8. The method of manufacturing a light-emitting panel according to claim 8, wherein the step of removing the second release film and attaching the light-emitting substrate to the cover plate on the first adhesive layer include:

An inorganic water blocking layer is formed on the light-emitting substrate, so that the inorganic water blocking layer and the first adhesive layer are bonded together.
A display device includes: a housing and a light-emitting panel, the light-emitting panel is arranged on the housing, and the light-emitting panel includes:

The light-emitting substrate, the first adhesive layer, the second adhesive layer and the cover plate are stacked in sequence from bottom to top; wherein,

A water-absorbing layer is provided between the first adhesive layer and the second adhesive layer, the water-absorbing layer is a closed structure, the water-absorbing layer is doped with desiccant particles, and the desiccant particles are made of metal It is composed of oxides, and the particle size of the desiccant particles is less than 6 microns.
10. The display device according to claim 10, wherein the outer edge of the water-absorbing layer and the outer edge of the first adhesive layer are in the same cross section.
11. The display device of claim 11, wherein the horizontal length of the orthographic projection of the water-absorbing layer on the first adhesive layer is smaller than the horizontal width of the first adhesive layer.
11. The display device of claim 11, wherein the first adhesive layer, the second adhesive layer, and the water-absorbing layer are made of a sub-sensitive adhesive material or a heat-sensitive adhesive material.
13. The display device according to claim 13, wherein the vertical thickness of the water absorbing layer is less than half of the sum of the vertical thickness of the first adhesive layer and the second adhesive layer.