WO2020155231A1

WO2020155231A1 - Light-emitting panel, preparation method for light-emitting panel, and display apparatus

Info

Publication number: WO2020155231A1
Application number: PCT/CN2019/075731
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: 2019-01-28
Filing date: 2019-02-21
Publication date: 2020-08-06
Also published as: CN109860417A

Abstract

Disclosed are a light-emitting panel, a preparation method for a light-emitting panel, and a display apparatus. The light-emitting panel comprises a light-emitting substrate, at least one group of barrier film layers, a first bonding layer, a second bonding layer and a release film layer that are arranged in sequence from bottom to top in a stacked manner, wherein a water-absorbing layer is arranged between the first bonding layer and the second bonding layer, the water-absorbing layer being of a closed structure. The light transmittance of the light-emitting panel is improved by configuring the water-absorbing layer to be of a closed structure.

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, at least one set of barrier film layer, the first adhesive layer, the second adhesive layer and the release film layer are laminated and arranged 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 the light-emitting panel described in the present application, the barrier film layer includes:

A first inorganic water blocking layer, an organic buffer layer, and a second inorganic water blocking layer are sequentially stacked from bottom to top.

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

Provide a light-emitting substrate;

Forming at least one set of barrier film layers on the light-emitting substrate;

Forming a first adhesive layer on the light-emitting substrate;

Forming a water-absorbing layer on the first adhesive layer, the water-absorbing layer being a closed structure;

A second adhesive layer and a release film layer are formed on the first adhesive layer on which the water-absorbing layer is formed.

In the method for manufacturing the light-emitting panel described in the present application, the step of forming a second adhesive layer and a release film layer on the first adhesive layer on which the water-absorbing layer is formed includes:

Provide a release film;

Forming a second adhesive layer on the release film layer;

In a vacuum environment, the second adhesive layer is attached to the first adhesive layer on which the water-absorbing layer is formed.

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 provided between the first adhesive layer and the second adhesive layer, and the water-absorbing layer is a closed structure, wherein the vertical of the first adhesive layer and the second adhesive layer The vertical thickness is 10-50 microns, and the vertical thickness of the water-absorbing layer is 10-50 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 water-absorbing layer is doped with desiccant particles, and the desiccant particles are composed of metal oxide.

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.

In the display device described in the present application, the barrier film layer includes:

Beneficial effect

The light-emitting panel provided by the embodiment of the present application includes a light-emitting substrate, at least one set of barrier film layers, a first adhesive layer, a second adhesive layer, and a release film layer stacked from bottom to top; A water absorbing layer is arranged between an adhesive layer and the second adhesive layer. The water absorbing layer is a closed structure. 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 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.

At present, the main packaging method of the top-emitting large-size flexible organic light emitting diode (Organic Light Emitting Diode, OLED) TV is mainly Face Seal (surface mount packaging), and its packaging materials are mainly composed of barrier films and surface mount packaging materials. The surface-laminated encapsulant used for bottom luminescence contains MxO (metal oxide) particles as a water-absorbing desiccant. Its particle size is about 1-6 microns. The plastic material has a low transmittance and cannot meet the top luminous penetration. The rate is greater than 98% of the requirement. Since the effective area of the package is outside the light-emitting area, only the desiccant in this area can absorb water, and the desiccant in the light-emitting area does not have a water-absorbing effect. Therefore, for top-emitting OLEDs, if only a desiccant (MxO particles) is added to the outside of the light-emitting area, water vapor can be prevented from intruding into the OLED from the side, which meets the requirements for packaging life during packaging, and can also meet the top-emitting penetration. Over-rate requirements.

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

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. FIG. 2 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, at least one set of barrier film layers 20, and a first layer stacked from bottom to top. The adhesive layer 30, the second adhesive layer 40 and the release film layer 50; wherein,

A water-absorbing layer 60 is provided between the first adhesive layer 30 and the second adhesive layer 40, and the water-absorbing layer 60 has a closed structure.

It can be understood that when the OLED is encapsulated, the encapsulation effective 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 can absorb water. Therefore, a circle of water-absorbing layer 60 can be applied on the first adhesive layer 30. The water-absorbing layer 60 is arranged corresponding to the effective area AA of the package, so that the water-absorbing layer 60 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 60, thereby increasing the light transmittance of the light-emitting panel.

Among them, in order to prevent water vapor from penetrating through the barrier film layer 20 (Barrier Film) and glue from the side of the light-emitting panel 100 into the OLED, this can be achieved by depositing multiple sets of barrier film layers 20.

The light-emitting panel 100 provided by the embodiment of the present application includes a light-emitting substrate 10, at least one set of barrier film layers 20, a first adhesive layer 30, a second adhesive layer 40, and a release film layer 50 stacked in sequence from bottom to top; Wherein, a water-absorbing layer 60 is provided between the first adhesive layer 30 and the second adhesive layer 40. The water-absorbing layer 60 is a closed structure. The light-emitting panel is improved by setting the water-absorbing layer 60 in a closed structure. The light transmittance of 100.

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 60 on the first adhesive layer 30 is smaller than the horizontal width of the first adhesive layer 30.

It can be understood that the water-absorbing layer 60 can be disposed inside the first adhesive layer 30 so that at least a part of the outside of the first adhesive layer 30 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 60 and the outer edge of the first adhesive layer 30 are in the same cross section.

Specifically, the water-absorbing layer 60 may be disposed on the peripheral area of the first adhesive layer 30 to cover the peripheral area of the first adhesive layer 30.

In some embodiments, the water absorption layer 60 is doped with desiccant particles, and the desiccant particles are composed of metal oxide.

Wherein, the first adhesive layer 30 and the second adhesive layer 40 are evenly 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 adhesive layer 30 and the second adhesive layer 40, the micron-level desiccant particles can be replaced with nano-level desiccant particles, or the opaque desiccant particles can be replaced. It is light-transmitting desiccant particles, 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 30 and the second adhesive layer 40 in the full wavelength range (380~780 nanometers) is greater than 98%, which meets the transmittance requirements of the top emission .

In some embodiments, the first adhesive layer 30, the second adhesive layer 40, and the water-absorbing layer 60 are hyposensitive adhesives or heat-sensitive adhesives.

In some embodiments, the vertical thickness of the water-absorbing layer 60 is less than half of the sum of the vertical thickness of the first adhesive layer 30 and the second adhesive layer 40.

Specifically, the vertical thickness of the first adhesive layer 30 and the second adhesive layer 40 is 10-50 microns, and the vertical thickness of the water-absorbing layer 60 is 10-50 microns.

In some embodiments, the barrier film layer 20 includes:

The first inorganic water blocking layer 201, the organic buffer layer 202, and the second inorganic water blocking layer 203 are sequentially stacked from bottom to top.

It can be understood that the inorganic water blocking layer and the organic buffer layer 202 can be alternately arranged to improve the water blocking performance of the light emitting panel 100. As shown in FIG. 2 or FIG. 4, a first inorganic water blocking layer 201 is provided. An organic buffer layer 202 is disposed on the inorganic water blocking layer 201, and a second inorganic water blocking layer 203 is further disposed on the organic buffer layer 202.

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. 6. FIG. 6 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 light-emitting substrate;

120. Form at least one set of barrier layers on the light-emitting substrate;

Specifically, the light-emitting substrate may be a flexible substrate. Deposit an inorganic water blocking layer on the light-emitting substrate, coat an organic buffer layer on the inorganic water blocking layer, and then continue to deposit an inorganic water blocking layer on the organic buffer layer, where the inorganic water blocking layer, the organic buffer layer and the inorganic water blocking layer Form a set of barrier layers.

Among them, the organic buffer layer can continue to be coated on the inorganic water blocking layer, and it can be staggered multiple times.

130. Form a first adhesive layer on the light-emitting substrate;

Specifically, an adhesive is coated on the barrier layer, and the moisture and solvent in the adhesive are dried to volatilize to form the first adhesive layer.

140. A water-absorbing layer is formed on the first adhesive layer, and the water-absorbing layer is a closed structure;

Coating a circle of water-absorbing layer on the first adhesive layer, where the outer edge of the water-absorbing layer formed by the 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.

150. Form a second adhesive layer and a release film layer on the first adhesive layer on which the water-absorbing layer is formed.

In some embodiments, the step of forming a second adhesive layer and a release film layer on the first adhesive layer on which the water-absorbing layer is formed includes:

Provide a release film;

Forming a second adhesive layer on the release film layer;

Wherein, an adhesive is coated on the release film layer, and moisture and solvent in the adhesive are dried to volatilize to form a second adhesive layer.

Finally, cut the edge of the light-emitting panel.

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, at least one set of barrier film layer, the first adhesive layer, the second adhesive layer and the release film layer are laminated and arranged 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.
The light emitting panel according to claim 1, wherein the barrier film layer comprises:

A first inorganic water blocking layer, an organic buffer layer, and a second inorganic water blocking layer are sequentially stacked from bottom to top.
A method for manufacturing a light-emitting panel includes:

Provide a light-emitting substrate;

Forming at least one set of barrier film layers on the light-emitting substrate;

Forming a first adhesive layer on the light-emitting substrate;

Forming a water-absorbing layer on the first adhesive layer, the water-absorbing layer being a closed structure;

A second adhesive layer and a release film layer are formed on the first adhesive layer on which the water-absorbing layer is formed.
8. The method for manufacturing a light-emitting panel according to claim 8, wherein the step of forming a second adhesive layer and a release film layer on the first adhesive layer on which the water-absorbing layer is formed comprises:

Provide a release film;

Forming a second adhesive layer on the release film layer;

In a vacuum environment, the second adhesive layer is attached to the first adhesive layer on which the water-absorbing layer is formed.
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, at least one set of barrier film layer, the first adhesive layer, the second adhesive layer and the release film layer are laminated and arranged from bottom to top; wherein,

A water-absorbing layer is provided between the first adhesive layer and the second adhesive layer, and the water-absorbing layer is a closed structure, wherein the vertical of the first adhesive layer and the second adhesive layer The vertical thickness is 10-50 microns, and the vertical thickness of the water-absorbing layer is 10-50 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.
10. The display device according to claim 10, 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.
10. The display device according to claim 10, wherein the water absorption layer is doped with desiccant particles, and the desiccant particles are composed of metal oxide.
11. The display device of claim 10, wherein the first adhesive layer, the second adhesive layer, and the water-absorbing layer are made of a sub-sensitive adhesive or a heat-sensitive adhesive.
15. The display device according to claim 14, 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.
The display device according to claim 10, wherein the barrier film layer comprises:

A first inorganic water blocking layer, an organic buffer layer, and a second inorganic water blocking layer are sequentially stacked from bottom to top.