Quantum dot diaphragm, backlight module and display device
By setting reflective protrusions and reflective grooves in the barrier layer of the quantum dot film, the problem of insufficient backlight uniformity of quantum dot displays is solved, and better display effect is achieved.
Patent Information
- Application Number
- CN202422809254.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-18
AI Technical Summary
Existing quantum dot displays have insufficient backlight uniformity, resulting in a yellowish/dark appearance around the quantum dot film.
Several reflective protrusions and grooves are provided on the side of the first barrier layer of the quantum dot film that is away from the quantum dot layer. The reflective protrusions and grooves are distributed at intervals to irregularly reflect the incident light and ensure that the light enters the quantum dot layer uniformly.
It improves backlight uniformity, ensures that the quantum dots around the quantum dot layer are fully excited, and improves the display effect.
Smart Images
Figure CN223486219U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of display technology, and in particular relates to a quantum dot film, a backlight module, and a display device. Background Technology
[0002] Currently, some televisions use quantum dot displays that have insufficient backlight uniformity. This is because the excitation energy of light is high in the central area, while the light energy is the lowest around the edges. As a result, the quantum dots around the edges of the quantum dot film are not fully excited, leading to the problem that the center of the quantum dot film is the brightest, while the edges are yellowish / dark. Utility Model Content
[0003] This application provides a quantum dot film, a backlight module, and a display device to improve the problem of existing quantum dot films having a yellowish / dark appearance around the edges.
[0004] In a first aspect, embodiments of this application provide a quantum dot film, the quantum dot film comprising a first barrier layer, a quantum dot layer and a second barrier layer, the first barrier layer, the quantum dot layer and the second barrier layer being stacked sequentially; the side of the first barrier layer facing away from the quantum dot layer is provided with a plurality of reflective protrusions and a plurality of reflective grooves, the reflective protrusions and the reflective grooves being distributed at intervals.
[0005] Optionally, the side of the first barrier layer facing away from the quantum dot layer is the first surface, and the height of the reflective protrusion protruding from the first surface is H, where 0mm < H ≤ 0.5mm.
[0006] Optionally, the side of the first barrier layer facing away from the quantum dot layer is the first surface, and the reflective groove is formed by the first surface being recessed in the direction from the first barrier layer to the quantum dot layer, and the depth of the reflective groove is D, where 0mm < D ≤ 0.5mm.
[0007] Optionally, the cross-sectional shape of the reflective protrusion is different from the cross-sectional shape of the reflective groove; or, the cross-sectional shape of the reflective protrusion is the same as the cross-sectional shape of the reflective groove.
[0008] Optionally, the reflective protrusion is prismatic, spherical, or cylindrical; and / or, the reflective groove is prismatic, spherical, or cylindrical.
[0009] Optionally, the second barrier layer has a refractive layer on the side facing away from the quantum dot layer.
[0010] Optionally, the refractive layer is a prism layer or a microlens layer.
[0011] Optionally, when the refractive layer is a prism layer, the prism layer is an array-distributed triangular prism structure or a pyramid structure.
[0012] Secondly, embodiments of this application also provide a backlight module, the backlight module including a light source and the aforementioned quantum dot film, wherein the light source is disposed on the side of the first barrier layer away from the quantum dot layer.
[0013] Thirdly, embodiments of this application also provide a display device, the display device including the backlight module described above.
[0014] The quantum dot film, backlight module, and display device provided in this application embodiment have a plurality of reflective protrusions and a plurality of reflective grooves on the side of the first barrier layer away from the quantum dot layer. The reflective protrusions and reflective grooves are distributed at intervals and can irregularly reflect the incident light, scattering the light as evenly as possible, so that the light enters the quantum dot layer more evenly. As a result, the quantum dots around the quantum dot layer can also be fully excited, which improves the problem of yellowing / darkness around the quantum dot film, improves the backlight uniformity, and thus achieves a better display effect. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without creative effort. In the following description, the same reference numerals denote the same parts.
[0016] Figure 1 This is a schematic diagram of a first structure of a quantum dot film provided in an embodiment of this application.
[0017] Figure 2 This is a schematic diagram of a first structure of a quantum dot film provided in an embodiment of this application.
[0018] Figure 3 This is a schematic diagram of a first structure of the first barrier layer provided in an embodiment of this application.
[0019] Figure 4 This is a schematic diagram of a second structure of the first barrier layer provided in an embodiment of this application.
[0020] Figure 5 This is a schematic diagram of a third structure of the first barrier layer provided in an embodiment of this application.
[0021] Figure 6 This is a schematic diagram of a fourth structure of the first barrier layer provided in an embodiment of this application.
[0022] Figure 7 This is a schematic diagram of the structure of the display device provided in the embodiments of this application.
[0023] Figure 8 This is a schematic diagram of the structure of a display device in the prior art.
[0024] Explanation of icon numbers:
[0025] 100, First barrier layer; 101, Reflective protrusion; 102, Reflective groove; 200, Quantum dot layer; 300, Second barrier layer; 400, Refractive layer; 410, Prism layer; 500, Display device. Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0028] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The term "and / or" includes any and all combinations of one or more of the associated listed items.
[0029] This application provides a quantum dot film, such as... Figures 1-6As shown, the quantum dot film includes a first barrier layer 100, a quantum dot layer 200, and a second barrier layer 300, which are stacked sequentially. The first barrier layer 100 has a plurality of reflective protrusions 101 and a plurality of reflective grooves 102 on the side facing away from the quantum dot layer 200, and the reflective protrusions 101 and reflective grooves 102 are distributed at intervals.
[0030] The quantum dot film provided in this application embodiment has a plurality of reflective protrusions 101 and a plurality of reflective grooves 102 on the side of the first barrier layer 100 facing away from the quantum dot layer 200. The reflective protrusions 101 and reflective grooves 102 are distributed at intervals. The reflective protrusions 101 and reflective grooves 102 can irregularly reflect the incident light, disperse the light as evenly as possible, and make the light enter the quantum dot layer 200 more evenly. As a result, the quantum dots around the quantum dot layer 200 can also be fully excited, which improves the problem of yellowing / darkness around the quantum dot film, improves the backlight uniformity, and thus achieves a better display effect.
[0031] The quantum dot layer 200 comprises quantum dot material and adhesive. The quantum dot material is uniformly formed within the adhesive to create the quantum dot layer 200. The quantum dot material generally includes red and green quantum dot materials, which emit red and green light when excited by a blue backlight LED, and together with the transmitted blue light, achieve RGB three-primary-color white light. The first and second barrier films both function to isolate water vapor and oxygen, protecting the quantum dot layer 200 and preventing its degradation or failure.
[0032] Optionally, the side of the first barrier layer 100 facing away from the quantum dot layer 200 is designated as the first surface, and the height of the reflective protrusion 101 protruding from the first surface is H, where 0 mm < H ≤ 0.5 mm. By controlling the height H of the reflective protrusion 101 protruding from the first surface within the aforementioned range, the production cost of the quantum dot film can be reduced while ensuring uniform light dispersion.
[0033] For example, the height H of the reflective protrusion 101 protruding from the first surface can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm or any range between two values, and can be set according to actual needs.
[0034] Optionally, the side of the first barrier layer 100 facing away from the quantum dot layer 200 is a first surface, and the reflective groove 102 is formed by recessing from the first surface toward the first barrier layer 100 and the quantum dot layer 200. The depth of the reflective groove 102 is D, where 0 mm < D ≤ 0.5 mm. By controlling the depth D of the reflective groove 102 within the above range, it can be ensured that the light is dispersed uniformly, while ensuring that the first barrier layer 100 can effectively isolate water vapor and oxygen.
[0035] For example, the depth D of the reflective groove 102 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm or any range between two values, and can be set according to actual needs.
[0036] In some embodiments of this application, the cross-sectional shape of the reflective protrusion 101 is different from the cross-sectional shape of the reflective groove 102. For example, the cross-sectional shape of the reflective protrusion 101 is a polygon (e.g., a pentagram), and the cross-sectional shape of the reflective groove 102 is another polygon (e.g., a triangle or a quadrilateral), a circle, an ellipse, or an irregular shape; or, the cross-sectional shape of the reflective protrusion 101 is circular, and the cross-sectional shape of the reflective groove 102 is a polygon, an ellipse, or an irregular shape; or, the cross-sectional shape of the reflective protrusion 101 is elliptical, and the cross-sectional shape of the reflective groove 102 is a polygon, a circle, or an irregular shape; or, the cross-sectional shape of the reflective protrusion 101 is irregular, and the cross-sectional shape of the reflective groove 102 is a polygon, a circle, or an ellipse.
[0037] In some other embodiments of this application, the cross-sectional shape of the reflective protrusion 101 may be the same as the cross-sectional shape of the reflective groove 102. For example, the cross-sectional shape of the reflective protrusion 101 and the cross-sectional shape of the reflective groove 102 may be the same polygon (e.g., a triangle, a square star, or a pentagram); or, the cross-sectional shape of the reflective protrusion 101 and the cross-sectional shape of the reflective groove 102 may both be circular; or, the cross-sectional shape of the reflective protrusion 101 and the cross-sectional shape of the reflective groove 102 may both be elliptical; or, the cross-sectional shape of the reflective protrusion 101 and the cross-sectional shape of the reflective groove 102 may both be the same irregular shape.
[0038] Optionally, the reflective protrusion 101 can be prismatic, spherical, or cylindrical; the reflective groove 102 can be prismatic, spherical, or cylindrical. To reflect light in as many directions as possible, it is preferable that the reflective protrusion 101 and the reflective groove 102 are prismatic or spherical with a wide reflection angle. For example, both the reflective protrusion 101 and the reflective groove 102 can be prismatic, spherical, or cylindrical; or, the reflective protrusion 101 is prismatic and the reflective groove 102 is spherical or cylindrical; or, the reflective protrusion 101 is spherical and the reflective groove 102 is prismatic or cylindrical; or, the reflective protrusion 101 is cylindrical and the reflective groove 102 is prismatic or spherical.
[0039] Specifically, reflective protrusions 101 and reflective grooves 102 can be prepared on the side of the first barrier layer 100 facing away from the quantum dot layer 200 using hot pressing, laser processing, or coating processes. Hot pressing, laser processing, and coating processes are all mature processes widely used in the industry, with low difficulty, high mass production capability, and are suitable for mass production applications.
[0040] In some embodiments of the present application, Figure 2 As shown, a refractive layer 400 is provided on the side of the second barrier layer 300 facing away from the quantum dot layer 200. By providing the refractive layer 400 on the side of the second barrier layer 300 facing away from the quantum dot layer 200, the refractive layer 400 can refract light passing through the second barrier layer 300, achieving a light-gathering effect and thus increasing brightness. This effectively expands the light emission angle and further improves backlight uniformity.
[0041] Specifically, after the second barrier film is formed, a refractive layer 400 can be formed on it using a soft-mold roller. The soft-mold roller forming process is a mature technology in the industry, with low difficulty and high mass production capability, making it suitable for mass production applications. Optionally, the refractive layer 400 can be a prism layer 410 or a microlens layer. When the refractive layer 400 is a prism layer 410, the prism layer 410 can be an array of triangular prism structures or pyramid structures.
[0042] This application also provides a backlight module, which includes a light source and a quantum dot film. The specific structure of the quantum dot film is as described in the above embodiments, with the light source disposed on the side of the first barrier layer 100 facing away from the quantum dot layer 200. Since this backlight module adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0043] This application also provides a display device 500, which includes a backlight module. The specific structure of the backlight module is as described in the above embodiments. Since this display device 500 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.
[0044] See Figure 7 and Figure 8 , Figure 7 and Figure 8 The central ellipse represents the illumination range of the backlight source. A comparison shows that... Figure 8 The existing display device 500' shown has significantly less light around its edges, with the light mainly concentrated in the center. This results in the quantum dots at the four edges not being fully excited, creating a dark / yellow frame phenomenon. Figure 7 The display device 500 of this application shown has a uniform overall light distribution, and the quantum dots on the entire screen are fully and uniformly excited, resulting in better overall backlight uniformity and visual effect.
[0045] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0046] The quantum dot film, backlight module, and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A quantum dot film, characterized in that, It includes a first barrier layer (100), a quantum dot layer (200) and a second barrier layer (300), which are stacked sequentially. The first barrier layer (100) has a plurality of reflective protrusions (101) and a plurality of reflective grooves (102) on the side facing away from the quantum dot layer (200), and the reflective protrusions (101) and the reflective grooves (102) are distributed at intervals.
2. The quantum dot film according to claim 1, characterized in that, The side of the first barrier layer (100) facing away from the quantum dot layer (200) is the first surface, and the height of the reflective protrusion (101) protruding from the first surface is H, where 0 mm < H ≤ 0.5 mm.
3. The quantum dot film according to claim 1, characterized in that, The side of the first barrier layer (100) facing away from the quantum dot layer (200) is the first surface. The reflective groove (102) is formed by the first surface being recessed in the direction from the first barrier layer (100) to the quantum dot layer (200). The depth of the reflective groove (102) is D, where 0 mm < D ≤ 0.5 mm.
4. The quantum dot film according to claim 1, characterized in that, The cross-sectional shape of the reflective protrusion (101) is different from the cross-sectional shape of the reflective groove (102); or, the cross-sectional shape of the reflective protrusion (101) is the same as the cross-sectional shape of the reflective groove (102).
5. The quantum dot film according to claim 4, characterized in that, The reflective protrusion (101) is prismatic, spherical, or cylindrical; and / or, the reflective groove (102) is prismatic, spherical, or cylindrical.
6. The quantum dot film according to any one of claims 1 to 5, characterized in that, The second barrier layer (300) has a refractive layer (400) on the side facing away from the quantum dot layer (200).
7. The quantum dot film according to claim 6, characterized in that, The refractive layer (400) is a prism layer (410) or a microlens layer.
8. The quantum dot film according to claim 7, characterized in that, When the refractive layer (400) is a prism layer (410), the prism layer (410) is an array-distributed triangular prism structure or pyramid structure.
9. A backlight module, characterized in that, The backlight module includes a light source and a quantum dot film as described in any one of claims 1 to 8, wherein the light source is disposed on the side of the first barrier layer (100) facing away from the quantum dot layer (200).
10. A display device, characterized in that, The display device (500) includes the backlight module as described in claim 9.