Quantum dot lens and manufacturing method thereof
By opening grooves on the bottom surface of the lens main body of the quantum dot lens and covering the quantum dot layer, the existing quantum dot diffusion plates have been solved, and the color gamut and product stability have been improved.
Patent Information
- Application Number
- CN202411702624.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-02-28
AI Technical Summary
Existing quantum dot diffusion plates are costly, highly toxic, and have insufficient stability, which affects product performance.
A quantum dot lens is designed, with the lens body having a bottom surface and a first groove is opened, and the groove is covered with a quantum dot layer, so that the light emitted by the light source directly irradiates the quantum dot layer, excites the quantum dots to produce a quantum dot effect, and forms white light with wide color gamut.
Through the design of quantum dot lenses, the color gamut is improved, reducing the loss of light during the process of passing through lenses, reflective sheets, etc., and improving the color gamut and stability of the product.
Smart Images
Figure CN119535838A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of display technology, and in particular to a quantum dot lens and a method for manufacturing the same. Background Art
[0002] In the display field, blue LED chips are usually used with yellow phosphors to emit white light. In order to improve the display effect, quantum dots are gradually being used in backlight modules. There are many common schemes for using quantum dots to improve the display effect. For example, quantum dots are mixed into the diffuser to form a quantum dot diffuser to improve the color points and color gamut of the TV; or, quantum dots are bonded to a PET substrate to form a quantum dot film, which is combined with the diffuser, brightening film, reflector and blue LED light source in the TV backlight to form a quantum dot TV backlight module to improve the color gamut. However, quantum dot films and quantum dot diffusers are expensive and highly toxic, which is harmful to assembly workers. In addition, the quantum dot diffuser is not stable enough. Long-term use of quantum dots will gradually decay and fail, affecting product performance. Summary of the invention
[0003] The embodiments of the present application provide a quantum dot lens and a method for manufacturing the same to solve the above-mentioned technical problems.
[0004] In a first aspect, an embodiment of the present application provides a quantum dot lens, comprising:
[0005] The lens body has a bottom surface, and a first groove is formed on the bottom surface, and the first groove is used to accommodate the light source;
[0006] The quantum dot layer covers the groove wall of the first groove.
[0007] Optionally, the lens body further has an upper surface, and the upper surface is a curved surface.
[0008] Optionally, the lens body further has a connecting surface connecting the upper surface and the bottom surface, the connecting surface is perpendicular to the bottom surface, and / or, in the axial direction of the lens body, the depth of the first groove is greater than the height of the connecting surface.
[0009] Optionally, the lens body is coaxially arranged with the quantum dot layer.
[0010] Optionally, the quantum dot layer is connected to the bottom surface.
[0011] Optionally, the quantum dot layer includes a first quantum dot and a second quantum dot, the first quantum dot includes a core layer, a first subshell layer and a second subshell layer from the inside to the outside, and the second quantum dot includes a core layer and a second shell layer from the inside to the outside.
[0012] Optionally, the core layer of the first quantum dot is CdTe, the first subshell layer is CdSe, and the second subshell layer is ZnS;
[0013] And / or, the core layer of the second quantum dot is CdSe, and the second shell layer is ZnS.
[0014] Optionally, the surfaces of the first quantum dot and the second quantum dot are both coated with hydrophobic ligands.
[0015] Optionally, in a direction perpendicular to the axis of the quantum dot lens, a cross-section of the first groove is circular.
[0016] In a second aspect, the present application also provides a method for manufacturing a quantum dot lens, which is applicable to the above-mentioned quantum dot lens, including:
[0017] providing a substrate;
[0018] Applying a first quantum dot solution on a first surface of the substrate;
[0019] Applying a second quantum dot solution on the second surface of the substrate;
[0020] Drying the substrate to obtain a quantum dot substrate;
[0021] Melting the lens substrate and the quantum dot substrate at high temperatures respectively;
[0022] Injecting the molten quantum dot substrate from the first injection port of the mold;
[0023] Injecting the molten lens substrate from the second injection port of the mold;
[0024] Press the mold;
[0025] After cooling, the mold is demoulded to obtain a quantum dot lens.
[0026] In the embodiment of the present application, by covering the quantum dot layer in the first groove opened on the bottom surface of the lens body, when the light emitted by the light source arranged in the first groove irradiates the quantum dot layer, the quantum dots in the quantum dot layer are excited by the blue light emitted by the light source, generating a quantum dot effect, forming white light with a wide color gamut, and achieving an improvement in the color gamut. At the same time, by making the light emitted by the light source directly irradiate the quantum dot layer, the loss of light in the process of passing through the lens, reflector, etc. can be reduced, which helps to further improve the color gamut of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.
[0028] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.
[0029] Figure 1 A schematic diagram of the three-dimensional structure of a quantum dot lens provided in an embodiment of the present application.
[0030] Figure 2 A cross-sectional view of a quantum dot lens provided for some embodiments of the present application.
[0031] Figure 3 A flow chart of a method for manufacturing a quantum dot lens provided in an embodiment of the present application.
[0032] Description of reference numerals:
[0033] 1. Lens body; 11. Bottom surface; 12. First groove; 13. Upper surface; 14. Connecting surface;
[0034] 2. Quantum dot layer. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0036] In the embodiments of the present application, at least one refers to one or more; multiple refers to two or more. In the description of the present application, the words "first", "second", "third", etc. are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.
[0037] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, in this specification, the terms "include", "comprises", "has" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.
[0038] It should be noted that, in the embodiments of the present application, "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.
[0039] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.
[0040] At present, the most common white light LED products on the market are blue light LED chips with yellow light phosphors. This type of white light LED is mainly used in lighting and LCD panel backlighting. In order to improve the color gamut of the product, quantum dots can be doped into the raw materials of the diffusion plate to form a quantum dot diffusion plate; or, the quantum dots can be bonded to a PET substrate to form a quantum dot film, which is combined with a diffusion plate, a brightness enhancement film, a reflective sheet and a blue light LED light source to form a quantum dot TV backlight module; or, the quantum dots can be combined with a reflective sheet to form a quantum dot reflective sheet. However, in the related art, in order to control costs, the quantum dot diffusion plate produced usually has a small amount of quantum dot material added, and the gain effect is limited. The color gamut of the light source is mainly determined by the phosphor added to the LED light source, and the quantum dot diffusion plate is prone to failure in extreme environments, the diffusion plate is more likely to deform, and the product stability is poor.
[0041] In order to improve the above problems, the embodiments of the present application provide a quantum dot lens and a method for manufacturing the same, which will be described in detail below in conjunction with specific embodiments.
[0042] First, see Figure 1 and Figure 2 , Figure 1 A schematic diagram of a three-dimensional structure of a quantum dot lens provided in an embodiment of the present application, Figure 2 A cross-sectional view of a quantum dot lens provided in some embodiments of the present application. The embodiments of the present application provide a quantum dot lens, comprising: a lens body 1 having a bottom surface 11, the bottom surface 11 having a first groove 12, the first groove 12 being used to accommodate a light source; and a quantum dot layer 2 covering the groove wall of the first groove 12.
[0043] The present application covers the quantum dot layer 2 in the first groove 12 opened on the bottom surface 11 of the lens body 1, so that when the light emitted by the light source arranged in the first groove 12 is irradiated to the quantum dot layer 2, the quantum dots in the quantum dot layer 2 are excited by the blue light emitted by the light source, generating a quantum dot effect, so that the half-wave peak width of the red, green and blue light in the spectrum is increased, thereby forming a wide color gamut of white light, and achieving an improvement in the color gamut. At the same time, compared with the solution in the related art that the light emitted by the light source passes through the lens and the reflector and then irradiates the diffuser (containing quantum dots), the structure of the quantum dot lens provided in the embodiment of the present application can make the light emitted by the light source directly irradiate the quantum dot layer 2, thereby reducing the loss of light in the process of passing through the lens, the reflector, etc., which helps to further improve the color gamut of the product.
[0044] It should be noted that the structure of the quantum dot lens provided in the embodiment of the present application (i.e., a structure with a quantum dot layer inside and a lens layer outside) can also achieve the purpose of improving the color gamut when used in a reflective lens.
[0045] Please continue reading Figure 1 and Figure 2 In some embodiments, the lens body 1 further has an upper surface 13, and the upper surface 13 is a curved surface.
[0046] Such a solution can adjust the direction of the light emitted from the lens body 1, change the distribution of the light, and help to evenly distribute the light emitted from the lens body 1. At the same time, it can also increase the light output angle and improve the uniformity of the backlight brightness.
[0047] Please continue reading Figure 1 and Figure 2 In some embodiments, the lens body 1 further has a connecting surface 14 connecting the upper surface 13 and the bottom surface 11 , and the connecting surface 14 is perpendicular to the bottom surface 11 .
[0048] If the upper surface 13 and the connecting surface 14 form a continuous smooth arc surface, the light emitted by the light source will be over-concentrated at the upper side of the lens body 1, forming an aperture, which affects the visual effect. Therefore, in the embodiment of the present application, the connecting surface 14 is perpendicular to the bottom surface 11, so that the light emitted by the light source can be emitted from the connecting surface, that is, it is ensured that light can be emitted from both the upper surface 13 and the connecting surface 14, which can avoid the situation where the light is concentrated when the upper surface 13 and the connecting surface 14 form a continuous smooth arc surface.
[0049] Please continue reading Figure 1 and Figure 2 In some embodiments, in the axial direction of the lens body 1 , the depth of the first groove 12 is greater than the height of the connecting surface 14 .
[0050] By adopting such a solution, it can be ensured that enough light from the light source is emitted from the upper surface 13 to ensure the overall luminous intensity of the product.
[0051] The specific values of the height of the connecting surface 14 , the depth of the first groove 12 , and the distance between the top of the upper surface 13 and the bottom surface 11 can be selected according to the usage scenario (such as the thickness of the backlight module), and the present application does not limit this.
[0052] Please continue reading Figure 1 and Figure 2 In some embodiments, the lens body 1 is coaxially arranged with the quantum dot layer 2. In this way, the uniformity of the light emitted from the lens body 1 can be ensured, and the light spot at a position closer to the light source can be avoided to affect the visual effect.
[0053] Please continue reading Figure 1 and Figure 2In some embodiments, the quantum dot layer 2 is connected to the bottom surface 11. In this way, it can be ensured that the light emitted by the light source passes through the quantum dot layer 2, so that more light can be irradiated on the quantum dots in the quantum dot layer 2, which helps to further improve the color gamut of the product.
[0054] In some embodiments, the quantum dot layer 2 includes a first quantum dot and a second quantum dot. The first quantum dot is a core layer, a first subshell layer and a second subshell layer from the inside to the outside, and the second quantum dot is a core layer and a second shell layer from the inside to the outside.
[0055] The embodiment of the present application enables the quantum dot layer 2 to include both double-shell quantum dots (i.e., first quantum dots) and single-shell quantum dots (i.e., second quantum dots). By adjusting the diameters of the first quantum dots and the second quantum dots, a variety of color combinations can be obtained, making the color of light emitted by the quantum dot lens more diverse.
[0056] In some embodiments, the core layer of the first quantum dot is CdTe, the first subshell layer is CdSe, and the second subshell layer is ZnS.
[0057] The first quantum dot is a CdTe / CdSe / ZnS structure, which mainly absorbs light in the wavelength range of 430 to 650nm, and the wavelength of light emitted is mainly 600 to 800nm. When the proportion of Zn in the shell is high, the hole defects on the surface of the quantum dot will be passivated, causing the emission wavelength to blue shift. Therefore, the wavelength range of light can be adjusted by controlling the proportion of Zn in the shell to obtain the required wavelength range.
[0058] In some embodiments, the core layer of the second quantum dot is CdSe, and the second shell layer is ZnS. The wavelength range adjustment principle of the second quantum dot is similar or the same as that of the first quantum dot, and will not be repeated here.
[0059] It should be noted that the materials of the core layer and shell layer (first subshell layer, second subshell layer and second shell layer) of the first quantum dot and the second quantum dot in the above embodiments are only examples, and the specific materials of the core layer and shell layer (first subshell layer, second subshell layer and second shell layer) can be selected according to needs, for example, they can include II-VI semiconductors, III-V semiconductors, IV-VI semiconductors, IV semiconductors, etc. Or include, for example, Cd, Se, Zn, S and / or InP.
[0060] In some embodiments, the half-wave peak width in the spectrum of the backlight can be increased by controlling the ratio of the number of the first quantum dots to the second quantum dots, as well as the particle size of the quantum dots, thereby improving the color gamut.
[0061] In some embodiments, the surfaces of the first quantum dot and the second quantum dot are coated with hydrophobic ligands.
[0062] By coating the surface of quantum dots with hydrophobic ligands, it is beneficial to evenly disperse the quantum dots in a non-polar organic solvent when making the quantum dot layer, thereby ensuring the consistency of the quantum dot layer. At the same time, the hydrophobic ligands can protect the quantum dots from oxidation and aggregation, enhancing their mechanical stability. In addition, coating the surface of quantum dots with hydrophobic ligands can also suppress the flickering phenomenon of quantum dots, thereby improving their photophysical properties.
[0063] In some embodiments, in a direction perpendicular to the axis of the quantum dot lens, the cross-section of the first groove 12 is circular.
[0064] By adopting such a solution, the parameters of light emitted from the quantum dot lens provided in the present application in all directions can be made substantially the same, thereby ensuring the consistency of light output.
[0065] Second, see Figure 3 , Figure 3 A flow chart of a method for manufacturing a quantum dot lens provided in an embodiment of the present application. The embodiment of the present application also provides a method for manufacturing a quantum dot lens, which is applicable to the above-mentioned quantum dot lens and includes the following steps.
[0066] S110: providing a substrate.
[0067] S120: coating a first quantum dot solution on a first surface of the substrate.
[0068] S130: coating a second quantum dot solution on the second surface of the substrate.
[0069] S140: Drying the substrate to obtain a quantum dot substrate.
[0070] S150: Melting the lens substrate and the quantum dot substrate at high temperatures respectively.
[0071] S160: injecting the molten quantum dot substrate from the first injection port of the mold.
[0072] S170: Injecting the molten lens substrate from the second injection port of the mold.
[0073] S180: Press the mold.
[0074] S190: demoulding after cooling to obtain a quantum dot lens.
[0075] If two quantum dot solutions are coated on the same surface, when the latter quantum dot solution is coated on the previous quantum dot solution that has been coated, the quantum dots in the already coated quantum dot solution may be taken away, causing the final product to be degraded. Therefore, in the embodiment of the present application, the first quantum dot solution and the second quantum dot solution are respectively coated on different surfaces of the substrate to avoid the situation where the number of quantum dots remaining on the substrate does not meet the requirements due to the coating of the two quantum dot solutions on the same surface one after another, thereby avoiding the problem of deterioration of the final product.
[0076] After the molten quantum dot substrate and lens substrate are injected into the mold respectively, the mold cavity is filled with the molten substrate. The volume of the substrate will shrink when it cools. Therefore, after the two molten substrates are injected into the mold, the mold needs to be closed and a forced force is applied to the outside of the mold to reduce the size of the mold, so that the shrunk part can be compensated and the obtained quantum dot lens can meet the size and precision requirements.
[0077] In some embodiments, the quantum dot solution may be coated by spin coating, so that the uniformity of the coating can be ensured.
[0078] In some embodiments, the lens substrate may be polycarbonate, and the base plate may also be polycarbonate. It should be noted that the lens substrate and the base plate may also be different materials.
[0079] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0080] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.
Claims
1. A quantum dot lens, characterized in that: include: The lens body has a bottom surface, the bottom surface is provided with a first groove, and the first groove is used to accommodate the light source; The quantum dot layer covers the groove wall of the first groove.
2. The quantum dot lens according to claim 1, characterized in that: The lens body also has an upper surface, and the upper surface is a curved surface.
3. The quantum dot lens according to claim 2, characterized in that: The lens body further comprises a connecting surface connecting the upper surface and the bottom surface, wherein the connecting surface is perpendicular to the bottom surface, and / or, in the axial direction of the lens body, the depth of the first groove is greater than the height of the connecting surface.
4. The quantum dot lens according to claim 1, characterized in that: The lens body and the quantum dot layer are coaxially arranged.
5. The quantum dot lens according to claim 1, characterized in that: The quantum dot layer is connected to the bottom surface.
6. The quantum dot lens according to claim 1, characterized in that: The quantum dot layer includes a first quantum dot and a second quantum dot. The first quantum dot includes a core layer, a first subshell layer and a second subshell layer from the inside to the outside. The second quantum dot includes a core layer and a second shell layer from the inside to the outside.
7. The quantum dot lens according to claim 6, characterized in that: The core layer of the first quantum dot is CdTe, the first subshell layer is CdSe, and the second subshell layer is ZnS; And / or, the core layer of the second quantum dot is CdSe, and the second shell layer is ZnS.
8. The quantum dot lens according to claim 6, characterized in that: The surfaces of the first quantum dots and the second quantum dots are both coated with hydrophobic ligands.
9. The quantum dot lens according to claim 1, characterized in that: In a direction perpendicular to the axis of the quantum dot lens, a cross section of the first groove is circular.
10. A method for manufacturing a quantum dot lens, applicable to the quantum dot lens according to any one of claims 1 to 9, characterized in that: include: providing a substrate; Applying a first quantum dot solution on a first surface of the substrate; Applying a second quantum dot solution on the second surface of the substrate; Drying the substrate to obtain a quantum dot substrate; Melting the lens substrate and the quantum dot substrate at high temperatures respectively; Injecting the quantum dot substrate in a molten state from a first injection port of a mold; Injecting the molten lens substrate from the second injection port of the mold; Compressing the mold; The mold is demoulded after cooling to obtain the quantum dot lens.