Light-emitting element and display device

Abstract

The utility model discloses a light-emitting element and a display device, and relates to the technical field of optics, the light-emitting element comprises a substrate, a light-emitting main body and a glue layer, the light-emitting main body is arranged at one side of the substrate, and one side surface, far away from the substrate, of the light-emitting main body forms a light-emitting surface; the glue layer comprises glue and reflecting particles arranged in the glue, and the glue is arranged on the side, opposite to the light-emitting body, of the substrate and used for being bonded with the supporting body. In the technical scheme of the utility model, the light-emitting element emits light through the light-emitting main body on one side of the substrate, the other side of the substrate is bonded and fixed with the supporting main body through the colloid in the glue layer, and the colloid is internally provided with the reflecting particles, so that the glue layer has reflecting capability, and light rays emitted to the glue layer can be reflected; therefore, the light is emitted from the light-emitting surface, the light-emitting efficiency is improved, and meanwhile, the heat conversion of the light-emitting element is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, and particularly relates to a light-emitting element and a display device. Background Art

[0002] OLED is a device that uses a multi-layer organic thin film structure to generate electroluminescence. It is easy to manufacture and only requires a low driving voltage. These main characteristics make OLED very prominent in meeting the applications of flat panel displays. In related technologies, due to the refractive index characteristics of materials, not all the light incident can be emitted from the light-emitting surface, resulting in a low luminous efficiency of the light-emitting device. Summary of the Utility Model

[0003] The main object of the utility model is to provide a light-emitting element and a display device, aiming to at least solve the problem of low luminous efficiency caused by the inability of light to be emitted in related technologies.

[0004] To achieve the above object, a light-emitting element proposed by the utility model includes:

[0005] A substrate;

[0006] A light-emitting body, disposed on one side of the substrate, and a side surface of the light-emitting body away from the substrate constitutes a light-emitting surface;

[0007] An adhesive layer, including a colloid and reflective particles disposed in the colloid, the colloid is disposed on a side of the substrate opposite to the light-emitting body, and is used for bonding with a support body.

[0008] In an embodiment, the substrate is a flexible substrate;

[0009] The light-emitting element further includes a backplane film disposed on a side of the substrate opposite to the light-emitting body, the adhesive layer is disposed between the substrate and the backplane film, and the backplane film constitutes the support body.

[0010] In an embodiment, the backplane film includes a PI film or a PET film.

[0011] In an embodiment, the reflective particles can reflect light of different wavelengths.

[0012] In an embodiment, the reflective particles include one or a combination of glass, metal, silicon carbide, barium sulfate, etc.

[0013] In an embodiment, the colloid includes an ultraviolet curable adhesive or a heat curable adhesive.

[0014] In an embodiment, the colloid is disposed in a transparent state.

[0015] In one embodiment, the outer surface of the reflective particles is coated with a coupling agent.

[0016] In one embodiment, the coupling agent includes a silane coupling agent.

[0017] The present utility model also provides a display device, including a light-emitting element, and the light-emitting element includes:

[0018] A substrate;

[0019] A light-emitting body, disposed on one side of the substrate, and a side surface of the light-emitting body away from the substrate constitutes a light-emitting surface;

[0020] An adhesive layer, including a colloid and reflective particles disposed in the colloid, the colloid is disposed on a side of the substrate opposite to the light-emitting body, and is used for bonding to a support body.

[0021] In the technical solution of the utility model, the light-emitting element emits light through the light-emitting body on one side of the substrate, and the other side of the substrate is adhesively fixed to the support body through the colloid in the adhesive layer. The colloid has reflective particles, so that the adhesive layer has a reflective ability, that is, it can reflect the light incident on the adhesive layer, so that the light is emitted from the light-emitting surface, improving the light-emitting efficiency and at the same time reducing the heat conversion of the light-emitting element. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the light-emitting element provided by the present utility model;

[0024] Explanation of the reference numerals in the drawings:

[0025] 100, light-emitting element; 1, substrate; 2, light-emitting body; 21, light-emitting surface; 3, adhesive layer; 31, colloid; 32, reflective particles; 4, backplane film.

[0026] The realization, functional features and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] OLED is a device that uses a multi-layer organic thin film structure to generate electroluminescence. It is very easy to manufacture and only requires a low driving voltage. These main features make OLED very prominent in meeting the applications of flat panel displays. In the related art, due to the refractive index characteristics of the material, not all the light can be emitted from the light-emitting surface after entering, resulting in a low luminous efficiency of the light-emitting device.

[0031] The present invention provides a light-emitting element and a display device, aiming to at least solve the problem of low luminous efficiency caused by the inability of light to be emitted in the related art.

[0032] Please refer to Figure 1, in an embodiment of the present utility model, the light-emitting element 100 includes a substrate 1, a light-emitting body 2, and an adhesive layer 3. The light-emitting body 2 is disposed on one side of the substrate 1, and a light-emitting surface 21 is formed on a side of the light-emitting body 2 away from the substrate 1. The adhesive layer 3 includes a colloid 31 and reflective particles 32 disposed in the colloid 31. The colloid 31 is disposed on a side of the substrate 1 opposite to the light-emitting body 2 for bonding to a support body.

[0033] In the technical solution of the utility model, the light-emitting element 100 emits light through the light-emitting body 2 on one side of the substrate 1. The other side of the substrate 1 is bonded and fixed to the support body through the colloid 31 in the adhesive layer 3. The colloid 31 has reflective particles 32, so that the adhesive layer 3 has a reflective ability, that is, it can reflect the light incident on the adhesive layer 3, so that the light is emitted from the light-emitting surface 21, improving the light-emitting efficiency, reducing the heat conversion of the light-emitting element 100 at the same time, reducing the temperature during use, and improving the service life of the device.

[0034] The support body can support the substrate 1 and can be a housing, a backplane film 4, or other functional structures such as a heat dissipation layer.

[0035] The light-emitting element 100 can be a rigid OLED or a flexible one. For a flexible OLED, its substrate 1 is flexible, having the advantages of being thinner, lighter, bendable, not easily broken, and having better durability. However, its own flexibility may cause curling. In related technologies, a backplane film 4 is usually disposed on a side of the substrate 1 away from the light-emitting body 2, which not only provides necessary support and reinforcement but also reduces the occurrence of curling.

[0036] On the back side of the substrate 1, i.e., the side away from the light-emitting body 2, it is not limited to only providing the backplane film 4, and other functional structures such as a heat dissipation layer can also be provided. The adhesive layer 3 can be provided between the backplane film 4 and the heat dissipation layer, or can be provided between the backplane film 4 and the installed housing. In the embodiment of the present utility model, the substrate 1 is a flexible substrate 1, and the light-emitting element 100 further includes a backplane film 4 provided on the side of the substrate 1 opposite to the light-emitting body 2. The adhesive layer 3 is provided between the substrate 1 and the backplane film 4, and the backplane film 4 constitutes the support body. Since the backplane film 4 needs to be fixed to the substrate 1 by glue itself, with such a setting, the adhesive layer 3 is directly provided between the backplane film 4 and the substrate 1, and only the reflective particles 32 need to be incorporated into the glue for fixing the backplane film 4 and the substrate 1, which is convenient for production. At the same time, compared with setting the adhesive layer 3 at other positions, it will cause light to pass through the backplane film 4 to reach the adhesive layer 3, resulting in a certain light loss. However, directly bonding the substrate 1 and the backplane film 4 through the adhesive layer 3 can minimize the light loss and improve the light-emitting efficiency.

[0037] Among them, the backplane film 4 includes a PI film or a PET film.

[0038] It should be noted that during the formation of the adhesive layer 3, the colloid 31 and the reflective particles 32 are first mixed and then coated. To ensure the reflection ability of the adhesive layer 3, when the reflective particles 32 are mixed with the colloid 31, it is necessary to ensure uniform dispersion and avoid aggregation and precipitation, which can be achieved through a high-shear mixer for uniform mixing. During coating, the mixed colloid 31 and reflective particles 32 can be uniformly coated on the substrate 1 and the backplane film 4 by methods such as screen printing, spraying, or roll coating.

[0039] The reflective particles 32 include, but are not limited to, a combination of one or more of glass, metal, silicon carbide, and barium sulfate. The reflective particles 32 of different materials have different reflection abilities for light of different wavelengths, and at the same time have different physical and chemical properties. The selection depends on specific application requirements, including factors such as reflection performance, thermal stability, mechanical strength, and cost. For example, barium sulfate can be selected if near-infrared light or infrared light needs to be reflected; silicon carbide or glass can be selected if the thermal stability of the adhesive layer 3 needs to be improved; silicon carbide and carbon fiber can be selected if the toughness of the adhesive layer 3 needs to be improved to reduce the possibility of cracking of the adhesive layer 3; aluminum and beryllium in metals can be selected if the thermal conductivity of the adhesive layer 3 needs to be improved. Although aluminum and beryllium have a relatively large coefficient of thermal expansion, they have excellent thermal conductivity and a relatively low material price. In summary, the specific material of the reflective particles 32 can be selected according to actual needs.

[0040] It is understandable that the light-emitting element 100 can emit different lights. In order to improve the reflection effect of the glue layer 3, in some embodiments, the reflective particles 32 can reflect light of different wavelengths; as described above, according to requirements, a variety of the reflective particles 32 that can reflect specific wavelengths can be selected.

[0041] The colloid 31 has various forms. The colloid 31 can be an ultraviolet curable glue or a heat curable glue. The actual selection can be made according to the required physical and chemical properties and the selected reflective particles 32; for example, when the reflective particles 32 are metals, glass, etc., the ultraviolet curable glue is used for the colloid 31. While the curing efficiency is fast, the bonding strength between the colloid 31 and the reflective particles 32 is high; when the glue layer 3 needs to be thicker or the overall light transmittance of the light-emitting element 100 is poor, it is easy to cause bubbles between the ultraviolet curable glue and the reflective particles 32, affecting the reflection performance of the overall glue layer 3. Therefore, at this time, the colloid 31 can use the heat curable glue; if the light-emitting element 100 needs to have better mechanical properties, the colloid 31 selects the heat curable glue. In summary, what kind of glue the colloid 31 is can be selected according to specific application requirements.

[0042] It is understandable that the reflection of the glue layer 3 is achieved through the reflective particles 32 in the colloid 31. If the colloid 31 has a color, it will cause the colloid 31 to absorb a part of the light and convert this part of the light energy into heat energy, which will weaken the reflection ability of the overall glue layer 3. Therefore, in the embodiments of the present invention, the colloid 31 is arranged to be transparent; arranged in this way, it can be ensured as much as possible that the light can reach the surface of the reflective particles 32 as much as possible and is emitted from the light-emitting surface 21 through the reflective particles 32, rather than being directly absorbed, thus reducing the generation of heat and improving the light-emitting efficiency.

[0043] The bonding strength between the reflective particles 32 and the colloid 31 affects the performance of the glue layer 3. If the bonding force between the reflective particles 32 and the colloid 31 is poor, bubbles may exist between the reflective particles 32 and the colloid 31 during the curing process, affecting the strength of the glue layer 3 and also affecting the airtightness and light transmittance of the glue layer 3. Therefore, in the embodiments of the present invention, the outer surface of the reflective particles 32 is coated with a coupling agent. In this way, through the setting of the coupling agent, the bonding performance between the reflective particles 32 and the colloid 31 can be improved, and the generation of bubbles can be reduced.

[0044] The coupling agent includes but is not limited to silane coupling agents, and can also be titanate coupling agents, peroxysilanes, etc., and can be selected according to its own properties and actual situations.

[0045] The present utility model further provides a display device, which includes a light-emitting element 100. The specific structure of the light-emitting element 100 refers to the above embodiments. Since this display device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0046] In the technical solution of the utility model, the light-emitting element 100 emits light through the light-emitting body 2 on one side of the substrate 1, and the other side of the substrate 1 is adhesively fixed to the support body through the colloid 31 in the glue layer 3. The colloid 31 has reflection particles 32, so that the glue layer 3 has the ability to reflect, that is, it can reflect the light incident on the glue layer 3, so that the light is emitted from the light-emitting surface 21, improving the light-emitting efficiency. At the same time, the heat conversion of the light-emitting element 100 is reduced, the temperature during use is lowered, and the service life of the device is improved.

[0047] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A light emitting element, characterized in that: include: substrate; A light-emitting body is arranged on one side of the substrate, and a side surface of the light-emitting body away from the substrate constitutes a light-emitting surface; The glue layer comprises a colloid and reflective particles arranged in the colloid. The colloid is arranged on the side of the substrate opposite to the light-emitting body and is used for bonding with the supporting body.

2. The light emitting element according to claim 1, wherein The substrate is a flexible substrate; The light emitting element further comprises a back plate film arranged on the side of the substrate opposite to the light emitting body, the glue layer is arranged between the substrate and the back plate film, and the back plate film constitutes the supporting body.

3. The light emitting element according to claim 2, wherein: The back sheet film includes a PI film or a PET film.

4. The light emitting element according to claim 1, wherein The reflective particles can reflect light of different wavelengths.

5. The light emitting element according to claim 1 or 4, characterized in that: The reflective particles include one or a combination of glass, metal, silicon carbide, and barium sulfate.

6. The light emitting element according to claim 1, wherein The colloid includes ultraviolet curing glue or heat curing glue.

7. The light-emitting element according to claim 1 or 6, characterized in that: The colloid is arranged in a transparent state.

8. The light emitting element according to claim 1, wherein The outer surface of the reflective particles is coated with a coupling agent.

9. The light emitting element according to claim 8, wherein: The coupling agent includes a silane coupling agent.

10. A display device, characterized in that: The light emitting device comprises the light emitting element according to any one of claims 1 to 9.

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