Quantum dot diffusion plate, backlight module and display device
By setting quantum dot material layers of different thicknesses and a protective structure in the quantum dot diffuser plate, the problem of blue tint at the edges of the liquid crystal display was solved, improving the display effect and extending the service life.
Patent Information
- Application Number
- CN202511952116.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-02-17
AI Technical Summary
In existing technologies, LCD displays are prone to a bluish tint at the edges, which affects the display quality.
A first sub-quantum dot material layer is set in the middle region of the quantum dot diffuser plate, and a second sub-quantum dot material layer with a thickness greater than that in the middle region is set in the edge region. Combined with the protective structure of the cover plate and the substrate, it is ensured that the blue light emitted by the light source excites more red and green light in the edge region, thereby adjusting the light mixing ratio between the edge region and the middle region.
By adjusting the thickness and density of the quantum dot material layer, the problem of bluish edges on the display device was improved, the display effect was enhanced, and the lifespan of the quantum dot diffuser plate was extended.
Smart Images
Figure CN121541400A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and in particular to a quantum dot diffuser plate, a backlight module, and a display device. Background Technology
[0002] Liquid crystal displays (LCDs) typically require a backlight module to provide a uniform surface light source. For displays with high color gamut requirements, a blue light lamp combined with a quantum dot diffuser is usually used to generate the surface light source.
[0003] In related technologies, quantum dot diffusion plates include a quantum dot material layer and a barrier film covering both sides of the quantum dot material layer. The quantum dot material layer is formed by uniformly dispersing quantum dot materials in a resin layer. When the quantum dot material is irradiated by blue light emitted by a blue lamp, the quantum dot material is excited to produce red and green light. The red and green light mixes with the blue light, which can improve the display color gamut of the display.
[0004] However, in related technologies, a bluish tint often appears at the edges of the display, affecting the display effect. Summary of the Invention
[0005] Based on this, embodiments of this application provide a quantum dot diffuser plate, a backlight module, and a display device, which can improve the problem of blue edges on the display device and enhance the display effect of the display device.
[0006] On one hand, embodiments of this application provide a quantum dot diffusion plate, the quantum dot diffusion plate having a central region and an edge region surrounding the central region; the quantum dot diffusion plate includes:
[0007] substrate;
[0008] A quantum dot material layer is disposed on one side of the substrate. The quantum dot material layer includes a first sub-quantum dot material layer and a second sub-quantum dot material layer. The first sub-quantum dot material layer is located in the middle region, and the second sub-quantum dot material layer is located in the edge region. The thickness of the second sub-quantum dot material layer is greater than the thickness of the first sub-quantum dot material layer.
[0009] A cover plate is located on the side of the quantum dot material layer facing away from the substrate.
[0010] In one implementation, the cover plate has a support protrusion on the side facing the quantum dot material layer, and the support protrusion is supported on the first sub-quantum dot material layer.
[0011] In one implementation, the support protrusions include multiple protrusions, which are arranged at intervals on the cover plate.
[0012] In one implementation, the supporting protrusion is made of transparent adhesive.
[0013] In one implementation, the end of the supporting protrusion facing the quantum dot diffuser is dome-shaped.
[0014] In one implementation, the surface of the first sub-quantum dot material layer facing away from the substrate is parallel to the substrate;
[0015] And / or,
[0016] The surface of the second quantum dot material layer facing away from the substrate is parallel to the substrate.
[0017] In one implementation, a first sub-quantum dot material layer has a first quantum dot density, and a second sub-quantum dot material layer has a second quantum dot density, wherein the second quantum dot density is greater than or equal to the first quantum dot density.
[0018] In one implementation, a second quantum dot material layer is bonded to a substrate and a cover plate.
[0019] On the other hand, embodiments of this application provide a backlight module, including:
[0020] light source;
[0021] The quantum dot diffuser plate provided in the foregoing embodiments of this application is located on the light emission path of the light source.
[0022] In another aspect, embodiments of this application provide a display device, including the backlight module provided in the foregoing embodiments of this application.
[0023] The quantum dot diffuser plate, backlight module, and display device provided in this application embodiment utilize a quantum dot material layer disposed on one side of a substrate. A first sub-quantum dot material layer is disposed in the middle region of the quantum dot diffuser plate, and a second sub-quantum dot material layer is disposed in the edge region of the quantum dot diffuser plate, with the edge region surrounding the middle region. The thickness of the second sub-quantum dot material layer is set to be greater than the thickness of the first sub-quantum dot material layer. A cover plate is then disposed on the side of the quantum dot material layer facing away from the substrate. Thus, when the quantum dot diffuser plate is positioned in the light emission direction of the light source, when the blue light emitted by the light source excites the quantum dot material to emit red and green light from the second sub-quantum dot material layer, the thicker second sub-quantum dot material layer can consume more blue light and excite more red and green light. This ensures that the mixing ratio of blue, red, and green light in the edge region is consistent with that in the middle region, thereby improving the problem of bluish edges in the display device and enhancing the display effect.
[0024] In addition, the cover plate and substrate can protect the quantum dot material layer, preventing external moisture from affecting the quantum dot material in the quantum dot material layer and extending the service life of the quantum dot diffusion plate. Attached Figure Description
[0025] Figure 1 This is a simplified structural diagram of a backlight module provided in some embodiments of this application.
[0026] Figure 2 This is a schematic diagram of a quantum dot diffuser plate in a backlight module provided in some embodiments of this application.
[0027] Figure 3 This is another schematic diagram of the quantum dot diffuser plate in the backlight module provided in some embodiments of this application.
[0028] Figure 4 This is a flowchart illustrating the fabrication process of a quantum dot diffuser plate in a backlight module provided in some embodiments of this application.
[0029] Explanation of reference numerals in the attached figures:
[0030] 10-Backlight module;
[0031] 101 - Middle region; 102 - Edge region; 11 - Light source; 12 - Quantum dot diffuser plate;
[0032] 121-Substrate; 122-Quantum dot material layer; 123-Cover plate;
[0033] 1221 - First sub-quantum dot material layer; 1222 - Second sub-quantum dot material layer; 1231 - Support protrusion. Detailed Implementation
[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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.
[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0040] With the development of display technology, LCDs typically require a backlight module to provide a uniform surface light source. For displays with high color gamut requirements, a combination of blue LEDs and quantum dot diffusers is usually used to generate the surface light source.
[0041] Figure 1 This is a simplified structural diagram of a backlight module provided in some embodiments of this application.
[0042] In some examples, refer to Figure 1 As shown, this application embodiment provides a backlight module 10. The backlight module 10 may include a light source 11. It is understood that in some examples of this application embodiment, the light source 11 may be a blue light source 11. For example, it may be a lamp panel formed by arranging multiple blue lamps.
[0043] In some examples, the blue light can be a light-emitting diode (LED) that emits blue light.
[0044] It is understood that in some examples of embodiments of this application, the specific type of light source 11 is shown only as a specific example and is not intended to limit the specific type of light source 11.
[0045] In some examples, refer to Figure 1 As shown, the backlight module 10 may include a quantum dot diffuser plate 12. The quantum dot diffuser plate 12 may be disposed on the light emission path of the light source 11. That is, the light emitted by the light source 11 can illuminate the quantum dot diffuser plate 12, exciting the quantum dot material of the quantum dot diffuser plate 12, thereby causing the quantum dot material to generate red light (R) and green light (G) under the excitation of the blue light source 11.
[0046] In some examples, refer to Figure 1 As shown, the red light (R) and green light (G) generated by the quantum dot material will spread evenly in all directions. That is to say, some of the red light (R) and green light (G) will spread towards the direction of the light source 11, and after being reflected by the lamp board, they will pass through the quantum dot diffuser plate 12 again and mix with the blue light (B).
[0047] It is understandable that the central region 101 of the display device contains reflected red (R) and green (G) light from all sides, as well as the red (R) and green (G) light originally generated by the quantum dot material. However, the edge region 102, at least on the side furthest from the center, does not reflect any red (R) or green (G) light. Therefore, the amount of red (R) and green (G) light in the mixed light of the central region 101 is greater than that of the edge region. In other words, the proportion of blue (B) light in the mixed light of the edge region 102 is greater than the proportion of blue (B) light in the red light of the central region 101. This may cause a bluish tint to appear in the edge region 102 of the display device, affecting the display effect.
[0048] Figure 2 This is a schematic diagram of a quantum dot diffuser plate in a backlight module provided in some embodiments of this application.
[0049] In some examples, refer to Figure 2As shown, the quantum dot diffusion plate 12 provided in this embodiment of the application may have a central region 101 and an edge region 102. The edge region 102 may surround the central region 101.
[0050] In some examples, the edge region 102 and the middle region 101 are a single structure. The edge region 102 can be determined based on the area that may appear bluish on different display devices.
[0051] In some examples, the edge region 102 can be determined based on the distance between the outermost blue light lamp in the light source 11 and the side of the quantum dot film. When the distance between the outermost blue light lamp and the side of the quantum dot film is large, the width of the edge region 102 can be set to be larger. When the distance between the outermost blue light lamp and the side of the quantum dot film is small, the width of the edge region 102 can be set to be smaller. That is to say, in some examples of the embodiments of this application, the specific width of the edge region 102 is not limited, and can be specifically set according to different specifications or types of light sources 11.
[0052] In some examples, refer to Figure 2 As shown, the quantum dot diffusion plate 12 may include a substrate 121. The substrate 121 may be a transparent substrate 121.
[0053] In some examples, substrate 121 may include any one of glass substrate 121, acrylic substrate 121, or plastic substrate 121. As a specific example, in an embodiment of this application, substrate 121 may be a glass substrate 121. This can improve the flatness of substrate 121, and the good moisture barrier properties of glass substrate 121 can be used to protect the quantum dot material.
[0054] In some examples, refer to Figure 2 As shown, the quantum dot diffusion plate 12 may include a quantum dot material layer 122. The quantum dot material layer 122 may be disposed on one side of the substrate 121.
[0055] In some examples, refer to Figure 2 As shown, the quantum dot material layer 122 may include a first sub-quantum dot material layer 1221. The first sub-quantum dot material layer 1221 may be a quantum dot material layer 122 formed by uniformly dispersing quantum dot materials in a resin material.
[0056] In some examples, refer to Figure 2 As shown, the first sub-quantum dot material layer 1221 can be disposed in the middle region 101.
[0057] In some examples, refer to Figure 2As shown, the quantum dot material layer 122 may include a second sub-quantum dot material layer 1222. The second sub-quantum dot material layer 1222 may be disposed in the edge region 102. That is, the second sub-quantum dot material layer 1222 may surround the outer periphery of the first sub-quantum dot material layer 1221.
[0058] It is understood that in some examples of the embodiments of this application, the second sub-quantum dot material layer 1222 may be the same as, similar to or similar to the first sub-quantum dot material layer 1221. For details, please refer to the detailed description of the first sub-quantum dot material layer 1221 in the foregoing embodiments of this application. This application will not repeat the description in this embodiment.
[0059] In some examples, the thickness of the second sub-quantum dot material layer 1222 can be greater than the thickness of the first sub-quantum dot material layer 1221. That is, along the thickness direction of the quantum dot diffuser 12, the size of the second sub-quantum dot material layer 1222 can be greater than the size of the first sub-quantum dot material layer 1221.
[0060] In some examples, refer to Figure 2 As shown, the quantum dot diffusion plate 12 may include a cover plate 123. The cover plate 123 may be disposed on the side of the quantum dot material layer 122 opposite to the substrate 121.
[0061] In some examples, the cover plate 123 may be made of a transparent material. The cover plate 123 may include any one of a glass cover plate 123, a plastic cover plate 123, or an acrylic cover plate 123. It is understood that in some examples of the embodiments of this application, the material of the cover plate 123 may be the same as, similar to, or similar to the substrate 121. For details, please refer to the detailed description of the substrate 121 in the foregoing embodiments of this application, which will not be repeated in the embodiments of this application.
[0062] As a specific example, the cover plate 123 can be a glass cover plate 123. By utilizing the water vapor barrier properties of glass, the corrosion of the quantum dot material by external water vapor can be prevented, thereby extending the service life of the quantum dot material.
[0063] In some examples of embodiments of this application, a quantum dot material layer 122 is disposed on one side of the substrate 121, a first sub-quantum dot material layer 1221 is disposed in the middle region 101 of the quantum dot diffusion plate 12, and a second sub-quantum dot material layer 1222 is disposed in the edge region 102 of the quantum dot diffusion plate 12, the edge region 102 surrounding the middle region 101, and the thickness of the second sub-quantum dot material layer 1222 is set to be greater than the thickness of the first sub-quantum dot material layer 1221. Then, a cover plate 123 is disposed on the side of the quantum dot material layer 122 facing away from the substrate 121. Thus, after the quantum dot diffuser plate 12 is positioned in the light emission direction of the light source 11, when the blue light emitted by the light source 11 excites the quantum dot material to emit red and green light in the second sub-quantum dot material layer 1222, the thicker second sub-quantum dot material layer 1222 can consume more blue light and excite more red and green light. This allows the mixing ratio of blue, red, and green light in the edge region to be consistent with the mixing ratio of blue, red, and green light in the middle region 101, thereby improving the problem of blue bias at the edges of the display device and enhancing the display effect of the display device.
[0064] In addition, the cover plate 123 and the substrate 121 can protect the quantum dot material layer 122, isolate external moisture from affecting the quantum dot material in the quantum dot material layer 122, and extend the service life of the quantum dot diffusion plate 12.
[0065] Figure 3 This is another schematic diagram of the quantum dot diffuser plate in the backlight module provided in some embodiments of this application.
[0066] In some examples, refer to Figure 3 As shown, the cover plate 123 may have a support protrusion 1231 on the side facing the alleyway shop material layer. The support protrusion 1231 can be supported on the first quantum dot material layer 122.
[0067] In some examples, the support protrusion 1231 can be made of a transparent material. In this way, the obstruction of the red (R) and green (G) light generated by the quantum dot material layer 122 by the support protrusion 1231 can be reduced, ensuring the uniformity of light mixing and improving the display color gamut of the display device.
[0068] In some examples of embodiments of this application, a support protrusion 1231 is provided on the side of the cover plate 123 facing the quantum dot material layer 122, and the support protrusion 1231 is supported on the first quantum dot material layer 122. In this way, the support protrusion 1231 can keep a certain distance between the cover plate 123 and the surface of the first sub-quantum dot material layer 1221, so that the thickness of the second sub-quantum dot material layer 1222 can be adjusted by the support protrusion 1231, which facilitates precise adjustment of the color of the edge region 102 by the support protrusion 1231, thereby precisely controlling the problem of the edge region being bluish.
[0069] In some examples, refer to Figure 3 As shown, the support protrusions 1231 may include multiple protrusions. The multiple support protrusions 1231 may be arranged at intervals on the cover plate 123.
[0070] In some examples, multiple support protrusions 1231 may be evenly spaced on the cover plate 123.
[0071] In some examples, multiple support protrusions 1231 may be arranged in an array on the cover plate 123.
[0072] In some examples of embodiments of this application, multiple support protrusions 1231 are provided and spaced apart on the cover plate 123. Thus, each of the multiple spaced support protrusions 1231 can support the first sub-quantum dot material layer 1221, thereby providing support to the cover plate 123 from multiple points. This ensures the stability and uniformity of the support for the cover plate 123, and guarantees the smooth placement of the cover plate 123 on the first sub-quantum dot material layer 1221. Furthermore, the multiple spaced support protrusions 1231 supporting the cover plate 123 enhance its strength and impact resistance, ensuring effective protection of the quantum dot material layer 122.
[0073] In some examples, the support protrusion 1231 can be a transparent adhesive. For example, the support protrusion 1231 may include at least one of epoxy resin adhesive, polyurethane adhesive, or optically transparent adhesive. It is understood that in some examples of embodiments of this application, the specific type of the support protrusion 1231 is only shown as a specific example and is not intended to limit the specific type of the support protrusion 1231.
[0074] In some examples of embodiments of this application, transparent adhesive is used as the support protrusion 1231. In this way, the good light transmittance of the transparent adhesive can be used to ensure that the light excited by the quantum dot material layer 122 can pass through the cover plate 123 and the support protrusion 1231, thereby ensuring that the backlight module 10 has good optical performance and improving the brightness and color saturation of the display device.
[0075] In addition, the transparent adhesive can form a stable bonding force after curing, which can form a firm and stable connection with the cover plate 123, improve the stability of the support protrusion 1231 supporting the cover plate 123, and can also improve the strength of the cover plate 123.
[0076] In addition, transparent adhesive is used as the support protrusion 1231. Thus, the support protrusion 1231 can be generated on the cover plate 123 by dispensing or coating. This makes it easy to precisely control the shape, size and distribution of the support protrusion 1231, thereby making it easier to control the thickness of the second quantum dot material layer 1222 and to precisely control the color of the edge region 102, so that the light mixing ratio of the edge region 102 is consistent with the light mixing ratio of the middle region 101.
[0077] Figure 4 This is a flowchart illustrating the fabrication process of a quantum dot diffuser plate in a backlight module provided in some embodiments of this application.
[0078] In some examples, refer to Figure 4 As shown in some examples of embodiments of this application, when preparing the quantum dot diffusion plate 12, the supporting protrusions 1231 can be fabricated on the surface of the glass plate using a dispensing process. For example... Figure 4 As shown in step (a), a cover plate 123 with a support protrusion 1231 is obtained. After the support protrusion 1231 is cured, the cover plate 123 with the support protrusion 1231 is ready for use.
[0079] In some examples, refer to Figure 4 As shown in step (b), a first sub-quantum dot material layer 1221 can be coated on the surface of another glass plate (e.g., substrate 121) using a coating process in the intermediate region 101. The first sub-quantum dot material layer 1221 can be coated to a first thickness.
[0080] In some examples, before coating the first sub-quantum dot material layer 1221 in the intermediate region 101, the intermediate region 101 and the edge region 102 can be determined according to the specific shape and structure of the light source 11. Among them, the edge region 102 may not be coated, and the first sub-quantum dot material layer 1221 is only applied to the protruding part of the intermediate region 101.
[0081] In some examples, the first quantum dot material layer 1221 can be cured after coating. For example, ultraviolet (UV) light can be used for curing.
[0082] In some examples, refer to Figure 4 As shown in step (c), after the first sub-quantum dot material layer 1221 is cured, the second sub-quantum dot material layer 1222 can be coated on the edge region 102.
[0083] It is understood that the quantum dot materials in the first quantum dot material layer 1221 and the second quantum dot material layer 1222 can be uniformly dispersed in the adhesive. For example, the quantum dot material can be uniformly dispersed in the resin.
[0084] It should be noted that in some examples of the embodiments of this application, either the first sub-quantum dot material layer 1221 or the second sub-quantum dot material layer 1222 may be the same as, similar to or similar to the quantum dot material layer 122 in the related art. For details, please refer to the detailed description of the related art. The embodiments of this application will not repeat this description.
[0085] In some examples, the second sub-quantum dot material layer 1222 can be coated with a second thickness. The second thickness is greater than the first thickness.
[0086] In some examples, after the second sub-quantum dot material layer 1222 is coated, the cover plate 123 from step (a) can be placed on the quantum dot material layer 122, and a force is applied to the cover plate 123 toward the quantum dot material layer 122, causing the support protrusion 1231 to contact the first sub-quantum dot material layer 1221. Thus, the dimension of the support protrusion 1231 between the first sub-quantum dot material layer 1221 and the cover plate 123 is the thickness of the second sub-quantum dot material layer 1222 protruding from the first sub-quantum dot material layer 1221. In other words, the thickness of the second sub-quantum dot material layer 1222 can be precisely controlled by the dimension of the support protrusion 1231, thereby facilitating precise control of the color of the edge region 102.
[0087] In some examples, the second sub-quantum dot material layer 1222 can be cured when the support protrusion 1231 is in contact with the first sub-quantum dot material layer 1221. For example, the second sub-quantum dot material layer 1222 can be cured in the same, similar, or analogous manner as the first sub-quantum dot material layer 1221 to obtain... Figure 3 The quantum dot diffuser plate 12 is shown.
[0088] In some examples, after the second sub-quantum dot material layer 1222 is cured, the second sub-quantum dot material layer 1222 is bonded to the substrate 121 and the cover plate 123.
[0089] In other words, after the second quantum dot material layer 1222 cures, it is tightly bonded to the substrate 121 and the cover plate 123 by the pressure. Thus, the adhesive in the second quantum dot material layer 1222 can effectively isolate moisture, protecting the quantum dot material and extending its lifespan.
[0090] In some examples, the end of the support protrusion 1231 facing the quantum dot diffuser plate 12 can be dome-shaped. In this way, when the support protrusion 1231 contacts the first sub-quantum dot material layer 1221 and applies force, the dome-shaped end can effectively disperse the stress, avoid excessive local pressure on the underlying first sub-quantum dot material layer 1221, and prevent damage or deformation. This protects the structural integrity and optical properties of the first sub-quantum dot material layer 1221.
[0091] In some examples, refer to Figure 2 and Figure 3 As shown, the surface of the first quantum dot material layer 1221 facing away from the substrate 121 can be parallel or approximately parallel to the substrate 121. That is, the thickness of the first quantum dot material layer 1221 can be uniform.
[0092] It should be noted that in some examples of the embodiments of this application, "parallel" does not refer to absolute parallelism in a mathematical sense, but rather means that the surface of the first quantum dot material layer 122 facing away from the substrate 121 can maintain the same extension direction as the substrate 121. Those skilled in the art will understand that, due to the possibility of certain errors in the processing technology, these errors are negligible to those skilled in the art.
[0093] In some examples, refer to Figure 2 and Figure 3 As shown, the surface of the second quantum dot material layer 1222 facing away from the substrate 121 can be parallel or approximately parallel to the substrate 121. That is, the thickness of the second quantum dot material layer 1222 can be uniform.
[0094] In some examples of embodiments of this application, the surface of the first sub-quantum dot material layer 1221 facing away from the substrate 121 is set to be parallel to the substrate 121, and / or, the surface of the second sub-quantum dot material layer 122 facing away from the substrate 121 is set to be parallel to the substrate 121. This ensures that the optical path is substantially consistent when light passes through the first sub-quantum dot material layer 122 or the second sub-quantum dot material layer 1222, making the absorption and conversion efficiency of the quantum dot material layer 122 tend to be consistent in different regions. This reduces local light efficiency differences caused by uneven thickness and helps improve the uniformity of light output from the backlight module 10.
[0095] In addition, by setting the first sub-quantum dot material layer 1221 and / or the second sub-quantum dot material layer 1222 to a uniform thickness, when the first sub-quantum dot material layer 1221 and the second sub-quantum dot material layer 1222 are coated, it is convenient to accurately control the thickness of the first sub-quantum dot material layer 1221 and the second sub-quantum dot material layer 1222, which can improve the product yield, facilitate the precise control of the color of the edge area 102, and improve the display effect of the display device.
[0096] In some examples, the first sub-quantum dot material layer 1221 may have a first quantum dot density. The first quantum dot density may refer to the density of the quantum dot material uniformly dispersed in the first sub-quantum dot material layer 1221.
[0097] In some examples, the second sub-quantum dot material layer 1222 may have a second quantum dot density. The second quantum dot density may refer to the density of the quantum dot material uniformly dispersed in the second sub-quantum dot material layer 1222.
[0098] In some examples, the density of the second quantum dot can be greater than or equal to the density of the first quantum dot. That is, in some examples of embodiments of this application, the density of quantum dot material uniformly dispersed in the second sub-quantum dot material layer 1222 can be greater than or equal to the density of quantum dot material uniformly dispersed in the first sub-quantum dot material layer 1221.
[0099] In some examples, the density of the second quantum dot can be equal to the density of the first quantum dot.
[0100] In some examples, the density of the second quantum dot can be greater than that of the first quantum dot.
[0101] In some examples of embodiments of this application, the density of quantum dot material in the first quantum dot material layer 1221 is set to the first quantum dot density, and the density of quantum dot material in the second quantum dot material layer 1222 is set to the second quantum dot density, with the second quantum dot density being greater than or equal to the first quantum dot density. Thus, the second quantum dot material layer 122, with its higher concentration or greater thickness, can absorb more blue light (B), thereby exciting and generating more red light (R) and green light (B). In other words, the amount of blue light (B) in the edge region 102 can be reduced, while the amount of red light (R) and green light (B) in the edge region 102 can be increased. This ensures that the light mixing ratio of the edge region 102 is consistent with the light mixing ratio of the middle region 101, improving the problem of the edge region 102 being too blue and enhancing the display effect of the display device.
[0102] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0103] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A quantum dot diffusion plate, characterized by, The quantum dot diffusion plate (12) has a middle region (101) and a rim region (102) surrounding the middle region (101); the quantum dot diffusion plate (12) comprises: a substrate (121); a quantum dot material layer (122) disposed on one side of the substrate (121), the quantum dot material layer (122) comprising a first sub-quantum dot material layer (1221) and a second sub-quantum dot material layer (1222), the first sub-quantum dot material layer (1221) being located in the middle region (101), the second sub-quantum dot material layer (1222) being located in the rim region (102); the thickness of the second sub-quantum dot material layer (1222) being greater than the thickness of the first sub-quantum dot material layer (1221); a cover plate (123) disposed on the side of the quantum dot material layer (122) away from the substrate (121).
2. The quantum dot diffusion plate of claim 1, wherein, The side of the cover plate (123) facing the quantum dot material layer (122) is provided with a support protrusion (1231), and the support protrusion (1231) is supported on the first sub-quantum dot material layer (1221).
3. The quantum dot diffusion plate of claim 2, wherein, The support protrusion (1231) comprises a plurality of support protrusions (1231) arranged at intervals on the cover plate (123).
4. The quantum dot diffusion plate of claim 2, wherein, The support protrusion (1231) is transparent glue.
5. The quantum dot diffusion plate of claim 2, wherein, The support protrusion (1231) is dome-shaped towards one end of the quantum dot diffusion plate (12).
6. The quantum dot diffusion plate according to any one of claims 1-5, wherein, The side surface of the first sub-quantum dot material layer (1221) away from the substrate (121) is parallel to the substrate (121); and / or, The side surface of the second sub-quantum dot material layer (1222) away from the substrate (121) is parallel to the substrate (121).
7. The quantum dot diffusion plate according to any one of claims 1-5, wherein, The first sub-quantum dot material layer (1221) has a first quantum dot density, and the second sub-quantum dot material layer (1222) has a second quantum dot density, the second quantum dot density being greater than or equal to the first quantum dot density.
8. The quantum dot diffusion plate according to any one of claims 1-5, wherein, The second sub-quantum dot material layer (1222) bonds the substrate (121) and the cover plate (123).
9. A backlight module, characterized in that, Comprising: a light source (11); The quantum dot diffusion plate (12) of any one of claims 1-8 is located on the light path of the light source (11).
10. A display device, characterized by comprising: The backlight module (10) of claim 9 is provided.