Quantum dot lens

Abstract

The embodiment of the utility model provides a quantum dot lens, and the lens comprises a lens main body which is provided with a bottom surface, the bottom surface is provided with a first groove, and the first groove is used for accommodating a light source; and the quantum dot layer covers the groove wall of the first groove. The quantum dot layer covers the interior of the first groove formed in the bottom face of the lens body, so that when light emitted by the light source arranged in the first groove irradiates the quantum dot layer, quantum dots in the quantum dot layer are excited by blue light emitted by the light source, the quantum dot effect is generated, white light of a wide color gamut is formed, and the color gamut is improved. Meanwhile, the light emitted by the light source directly irradiates the quantum dot layer, so that the loss of the light in the process of passing through the lens, the reflector plate and the like can be reduced, and the color gamut of the product can be further improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a quantum dot lens. Background Technology

[0002] In the display field, blue LED chips paired with yellow phosphors are typically used to emit white light. To improve display performance, quantum dots are increasingly being applied to backlight modules. There are several common methods for using quantum dots to enhance display quality. For example, quantum dots can be incorporated into diffusers to form quantum dot diffusers, improving the color depth and color gamut of the television. Alternatively, quantum dots can be laminated onto a PET substrate to create a quantum dot film, which is then combined with the diffuser, brightness enhancement film, reflector, and blue LED light source in the television backlight to form a quantum dot television backlight module, further improving the color gamut. However, quantum dot films and quantum dot diffusers are expensive and contain highly toxic substances, posing a hazard to assembly workers. Furthermore, quantum dot diffusers lack stability, and with prolonged use, quantum dots gradually degrade and fail, affecting product performance. Utility Model Content

[0003] This application provides a quantum dot lens to solve the above-mentioned technical problems.

[0004] This application provides an embodiment of a quantum dot lens, comprising:

[0005] The lens body has a bottom surface, and a first groove is formed on the bottom surface for accommodating a light source.

[0006] A quantum dot layer is applied to the wall of the first groove.

[0007] Optionally, the lens body also has an upper surface, which is curved.

[0008] Optionally, the lens body also has a connecting surface that connects the upper surface and the bottom surface, the connecting surface being 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 and the quantum dot layer are arranged coaxially.

[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, wherein the first quantum dot consists of a core layer, a first subshell layer and a second subshell layer from the inside out, and the second quantum dot consists of a core layer and a second shell layer from the inside out.

[0012] Optionally, the core layer of the first quantum dot is CdTe, the first subshell is CdSe, and the second subshell 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 both the first and second quantum dots are coated with hydrophobic ligands.

[0015] Optionally, the cross-section of the first groove is circular in the direction perpendicular to the axis of the quantum dot lens.

[0016] In this embodiment, by covering a quantum dot layer within a first groove on the bottom surface of the lens body, when light emitted from a light source positioned within the first groove irradiates the quantum dot layer, the quantum dots in the quantum dot layer are excited by the blue light emitted from the light source, generating a quantum dot effect and forming white light with a wide color gamut, thereby improving the color gamut. Simultaneously, by allowing the light emitted from the light source to directly irradiate the quantum dot layer, the loss of light during its passage through lenses, reflectors, etc., can be reduced, further contributing to improving the color gamut of the product. Attached Figure Description

[0017] 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0019] Figure 1 This is a three-dimensional structural diagram of a quantum dot lens provided in an embodiment of this application.

[0020] Figure 2 A cross-sectional view of a quantum dot lens provided for some embodiments of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Lens body; 11. Bottom surface; 12. First groove; 13. Top surface; 14. Connecting surface;

[0023] 2. Quantum dot layer. Detailed Implementation

[0024] 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 protection scope of this application.

[0025] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0026] References such as “one embodiment” or “some embodiments” as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the terms “comprising,” “including,” “having,” and variations thereof, as used in this specification, mean “including, but not limited to,” unless otherwise specifically emphasized.

[0027] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0028] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. 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 a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0029] Currently, the most common type of white LED on the market uses blue LED chips paired with yellow phosphors. These white LEDs are primarily used in lighting and LCD panel backlighting. To improve the color gamut, quantum dots can be doped into the raw materials of a diffuser plate to form a quantum dot diffuser plate; alternatively, quantum dots can be laminated onto a PET substrate to create a quantum dot film, which can then be combined with a diffuser plate, brightness enhancement film, reflective sheet, and blue LED light source to form a quantum dot TV backlight module; or, quantum dots can be combined with a reflective sheet to form a quantum dot reflective sheet. However, in these technologies, to control costs, the amount of quantum dot material added to the quantum dot diffuser plate is usually small, resulting in limited gain. The color gamut of the light source is mainly determined by the phosphors added to the LED light source, and the quantum dot diffuser plate is prone to failure under extreme environments, with a high possibility of deformation, leading to poor product stability.

[0030] To address the aforementioned issues, this application provides a quantum dot lens and its fabrication method, which will be described in detail below with reference to specific embodiments.

[0031] Please see Figure 1 and Figure 2 , Figure 1This is a three-dimensional structural diagram of a quantum dot lens provided in an embodiment of this application. Figure 2 This is a cross-sectional view of a quantum dot lens provided in some embodiments of this application. Embodiments of this application provide a quantum dot lens, comprising: a lens body 1 having a bottom surface 11, a first groove 12 formed on the bottom surface 11 for accommodating a light source; and a quantum dot layer 2 covering the groove wall of the first groove 12.

[0032] This application covers a quantum dot layer 2 within a first groove 12 formed on the bottom surface 11 of the lens body 1. When light emitted from a light source disposed within the first groove 12 irradiates 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. This increases the half-wavelength width of red, green, and blue light in the spectrum, thereby forming white light with a wide color gamut and achieving an improvement in color gamut. Furthermore, compared to related technologies where light emitted from the light source passes through a lens and a reflector before irradiating a diffuser plate (containing quantum dots), the quantum dot lens structure provided in this application allows light emitted from the light source to directly irradiate the quantum dot layer 2, thereby reducing light loss during the process of passing through the lens and reflector, and further contributing to an improvement in the color gamut of the product.

[0033] It should be noted that the quantum dot lens structure provided in this application (i.e., the 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.

[0034] Please continue reading. Figure 1 and Figure 2 In some embodiments, the lens body 1 also has an upper surface 13, which is an arc surface.

[0035] This design allows for adjustment of the direction of light emitted from the lens body 1, altering the light distribution and helping to ensure a more uniform distribution of light emitted from the lens body 1. Simultaneously, it also increases the light emission angle, improving the uniformity of backlight brightness.

[0036] Please continue reading. Figure 1 and Figure 2 In some embodiments, the lens body 1 also has a connecting surface 14 that connects the upper surface 13 and the bottom surface 11, and the connecting surface 14 is perpendicular to the bottom surface 11.

[0037] 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-focused above the lens body 1, forming an aperture and affecting the visual effect. Therefore, in this embodiment, the connecting surface 14 is made perpendicular to the bottom surface 11, so that the light emitted by the light source can exit from the connecting surface, that is, both the upper surface 13 and the connecting surface 14 have light exiting, which can avoid the light concentration caused by the upper surface 13 and the connecting surface 14 forming a continuous smooth arc surface.

[0038] Please continue reading. Figure 1 and Figure 2 In some embodiments, the depth of the first groove 12 is greater than the height of the connecting surface 14 in the axial direction of the lens body 1.

[0039] This approach ensures that a sufficient amount of light emitted from the light source exits from the upper surface 13, thus guaranteeing the overall luminous intensity of the product.

[0040] The specific values ​​of the height of the connecting surface 14, the depth of the first groove 12, and the distance between the vertex of the upper surface 13 and the bottom surface 11 can be selected according to the application scenario (such as the thickness of the backlight module), and this application does not limit them.

[0041] Please continue reading. Figure 1 and Figure 2 In some embodiments, the lens body 1 and the quantum dot layer 2 are coaxially arranged. This ensures the uniformity of light emitted through the lens body 1 and avoids light spots appearing closer to the light source, which would affect the visual effect.

[0042] Please continue reading. Figure 1 and Figure 2 In some embodiments, the quantum dot layer 2 is connected to the bottom surface 11. This ensures that all light emitted from the light source passes through the quantum dot layer 2, allowing more light to reach the quantum dots in the quantum dot layer 2, which helps to further improve the color gamut of the product.

[0043] In some embodiments, the quantum dot layer 2 includes a first quantum dot and a second quantum dot. The first quantum dot consists of a core layer, a first subshell layer, and a second subshell layer from the inside out. The second quantum dot consists of a core layer and a second shell layer from the inside out.

[0044] In this embodiment, the quantum dot layer 2 includes both double-shell quantum dots (i.e., the first quantum dot) and single-shell quantum dots (i.e., the second quantum dot). By adjusting the diameters of the first and second quantum dots, a variety of color combinations can be obtained, making the colors of the light emitted through the quantum dot lens more diverse.

[0045] In some embodiments, the core layer of the first quantum dot is CdTe, the first subshell is CdSe, and the second subshell is ZnS.

[0046] The first quantum dot has a CdTe / CdSe / ZnS structure. This structure mainly absorbs light in the wavelength range of 430–650 nm, while emitting light with wavelengths primarily in the range of 600–800 nm. When the proportion of Zn in the shell is high, the hole defects on the quantum dot surface are passivated, resulting in a blue shift in the emission wavelength. Therefore, the wavelength range of the light can be adjusted by controlling the proportion of Zn in the shell to obtain the desired wavelength range.

[0047] In some embodiments, the core layer of the second quantum dot is CdSe, and the second shell layer is ZnS. The principle of wavelength range modulation of the second quantum dot is similar to or the same as that of the first quantum dot, and will not be repeated here.

[0048] It should be noted that the materials of the core and shell layers (first sub-shell, second sub-shell, and second shell) of the first and second quantum dots in the above embodiments are merely examples. The specific materials of the core and shell layers (first sub-shell, second sub-shell, and second shell) can be selected according to requirements. For example, they may include group II-VI semiconductors, group III-V semiconductors, group IV-VI semiconductors, group IV semiconductors, etc. Or they may include, for example, Cd, Se, Zn, S, and / or InP.

[0049] In some embodiments, the half-wavelength width in the spectrum of the backlight can be increased by controlling the ratio of the number of the first quantum dots and the second quantum dots, as well as the particle size of the quantum dots, thereby improving the color gamut.

[0050] In some embodiments, the surfaces of both the first quantum dot and the second quantum dot are coated with hydrophobic ligands.

[0051] By coating the surface of quantum dots with hydrophobic ligands, it is beneficial to ensure the uniform dispersion of quantum dots in nonpolar organic solvents during the fabrication of quantum dot layers, thereby guaranteeing the consistency of the quantum dot layers. Simultaneously, the hydrophobic ligands protect the quantum dots from oxidation and aggregation, enhancing their mechanical stability. Furthermore, coating the surface of quantum dots with hydrophobic ligands can suppress quantum dot scintillation, thus improving their photophysical properties.

[0052] In some embodiments, the cross-section of the first groove 12 is circular in a direction perpendicular to the axis of the quantum dot lens.

[0053] By adopting this approach, the parameters of the light emitted from the quantum dot lens provided in this application are basically the same in all directions, ensuring the consistency of the emitted light.

[0054] In some embodiments, the lens body 1 may be polycarbonate.

[0055] 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.

[0056] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A quantum dot lens, characterized in that, include: The lens body has a bottom surface, and a first groove is formed on the bottom surface for accommodating a light source. A quantum dot layer is applied to the wall of the first groove; The first groove is configured such that light emitted by a light source disposed within the first groove illuminates the quantum dot layer.

2. The quantum dot lens according to claim 1, characterized in that, The lens body also has an upper surface, which is an arc surface.

3. The quantum dot lens according to claim 2, characterized in that, The lens body also has a connecting surface that connects the upper surface and the bottom surface, the connecting surface being 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 is coaxially arranged with the quantum dot layer.

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 consists of a core layer, a first subshell layer, and a second subshell layer from the inside out. The second quantum dot consists of a core layer and a second shell layer from the inside out.

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 is CdSe, and the second subshell 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 both the first quantum dot and the second quantum dot are coated with hydrophobic ligands.

9. The quantum dot lens according to claim 1, characterized in that, The cross-section of the first groove is circular in a direction perpendicular to the axis of the quantum dot lens.

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