Quantum dot lens, backlight module, display device and method for manufacturing quantum dot lens

Abstract

The present invention relates to the technical field of LCD backlight, and particularly relates to a quantum dot lens, a backlight module, a display device, and a method for manufacturing a quantum dot lens. A quantum dot lens includes a lens body and a reflector. The lens body is a hollow cylinder or frustum, and the reflector is disposed on the upper bottom surface of the lens body. The lens body is a quantum dot fluorescent resin material layer. The backlight module includes an LED light source and the above-mentioned quantum dot lens. The display device includes a display panel, as well as the above-mentioned quantum dot lens and LED light source. The method for manufacturing a quantum dot lens includes three steps: injection molding, waterproof treatment, and encapsulation molding. In this application, the manufacturing process of the quantum dot lens is simple and easy to mass-produce, the consumption of the quantum dot fluorescent material is low, and the problems of poor consistency of the existing quantum dot lens and unsatisfactory diffusion of the secondary light distribution white light spot are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of LCD backlight, and particularly to a quantum dot lens, a backlight module, a display device, and a method for manufacturing a quantum dot lens. Background Art

[0002] Since the 21st century, the backlight technology has developed rapidly, with new technologies and products constantly emerging. The LED backlight technology has gradually become the mainstream in the LCD screen backlight market. Among them, the quantum dot material technology has received attention. In particular, quantum dot phosphors have a series of unique optical properties such as adjustable spectrum with size, narrow half-wave width of the emission peak, small Stokes shift, and high excitation efficiency, which have attracted wide attention in the LED backlight industry. However, the existing quantum dot backlight modules adopt a sandwich structure with a quantum dot phosphor sandwiched between two barrier films, which requires a large amount of expensive quantum dot phosphors. Ordinary quantum dot lenses are made by applying quantum dot phosphors or pasting fluorescent films, and their light uniformity and consistency are poor, and there is a risk of blue light leakage.

[0003] The backlight module of the LCD screen is divided into direct-lit and edge-lit according to the arrangement position of the LEDs. The direct-lit quantum dot backlight module mainly consists of optical films such as white LED light bars, lenses, diffusion plates, reflective films, and brightness enhancement films. The function of the lens is to diffuse the LED point light source into isotropic scattered light as much as possible and increase the divergence angle of the LED light. With the progress of technology and the continuous improvement of consumer requirements, the advantages of the photoluminescent quantum dot materials in the high color rendering effect of the LCD screen technology have become prominent. However, quantum dot materials also have characteristics such as being afraid of high temperature, being afraid of water, and being easy to oxidize. In this context, how to better solve the problem of quantum dot failure and reduce the usage amount of quantum dots to reduce costs is our research direction.

[0004] The existing quantum dot lenses are of an integrated design and are prepared by injection molding by mixing quantum dot materials with lens materials, or a quantum dot lens is stacked by means of 3D printing. A waterproof barrier layer is made on the surface layer of the quantum dot lens. The above two schemes have very poor water and oxygen barrier effects, and the manufacturing cost is very high. The 3D printing scheme has low efficiency and is difficult to mass-produce. Due to the isotropy of the light emitted by the quantum dots under excitation, such quantum dot lenses have obvious defects such as low light extraction efficiency, poor spot shape, and poor visual effect. Summary of the Invention

[0005] A quantum dot lens, comprising a lens body and a reflector, wherein the lens body is a hollow cylinder or frustum, and the reflector is disposed on the upper bottom surface of the hollow cylinder or frustum;

[0006] The lens body is a quantum dot fluorescent resin material layer.

[0007] Further, the thickness of each position of the lens body is uniform.

[0008] Further, the lower end of the lens body is fixedly connected to the base, and grooves and voids for heat dissipation are provided at the lower end of the base.

[0009] Further, waterproof structure layers are provided on the inner and outer sides of the lens body.

[0010] Further, the reflection mode of the reflector is specular reflection or random diffuse reflection or directional reflection with a Wiener surface structure.

[0011] A backlight module includes: the quantum dot lens as described above; and an LED light source, and the LED light source is arranged at the bottom of the cavity of the lens body.

[0012] A display device includes: a display panel, the quantum dot lens as described above; and an LED light source arranged at the bottom of the cavity of the lens body.

[0013] A method for manufacturing a quantum dot lens includes the following steps:

[0014] S1. Injection molding: Use a prefabricated mold and a specified optical resin material to fabricate a reflector by high-temperature injection molding, incorporate a quantum dot fluorescent material into the specified optical resin material, and fabricate the lens body by high-temperature injection molding.

[0015] S2. Waterproof treatment: Coat liquid waterproof resin on the inner and outer surfaces of the lens body, use the spraying method or the infiltration method to coat the waterproof resin, let it stand after coating and spin-dry it with an air knife or a high-speed centrifuge, and then cure it by heating or UV light irradiation or electron beam radiation.

[0016] S3. Encapsulation molding: Connect the upper part of the lens body and the reflector together by high-temperature pressing or gluing or ultrasonic high-frequency welding or laser welding to form a firm whole.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows:

[0018] The manufacturing process of the present application is simple and easy to mass-produce. It not only saves quantum dot fluorescent materials but also solves the problems of poor consistency of existing quantum dot lenses and the inability to scatter the secondary light distribution white light spot. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention

[0020] Figure 2 It is a schematic diagram of the structure of the lens body of the present invention Figure 1 -Lens body, 2-Waterproof structure layer, 3-Reflector, 4-LED light source, 5-Base. Detailed implementation mode

[0021] Embodiment 1

[0022] A quantum dot lens includes a lens body 1 and a mirror 3. The lens body 1 is in the shape of a hollow frustum. The lens body 1 is a quantum dot fluorescent resin material layer with uniform thickness at all positions of the lens. Waterproof structure layers 2 are provided on both the inner and outer sides of the lens body 1. The lower end of the lens body 1 is fixedly connected to a base 5. Grooves and voids for heat dissipation are provided at the lower end of the base 5. The mirror 3 is arranged on the upper bottom surface of the hollow frustum. The reflection mode of the mirror 3 is specular reflection or random diffuse reflection or directional reflection with a Wiener surface structure;

[0023] When the quantum dot lens is applied to the backlight module of a display device, an LED light source 4 is arranged at the bottom inside the cavity of the lens body 1. When the illumination light emitted by the LED light source 4 passes through the lens body 1, light corresponding to the quantum dot fluorescent material is excited by the quantum dot fluorescent resin material layer and is emitted from the exit surface of the lens body 1 to form the backlight of the backlight module. The mirror 3 is used to reflect the light directly emitted by the LED light source 4, making the light incident on the lens body 1 more uniform.

[0024] The manufacturing method of the quantum dot lens includes the following steps:

[0025] S1. Injection molding: The mirror 3 is manufactured by high-temperature injection molding using a prefabricated mold and a specified optical resin material. Quantum dot fluorescent material is incorporated into the specified optical resin material, and the lens body 1 is manufactured by high-temperature injection molding;

[0026] S2. Waterproof treatment: Liquid waterproof resin is coated on the inner and outer surfaces of the lens body 1. The waterproof resin is coated by spraying or dipping methods. After coating, it is left standing and dried by a air knife or a high-speed centrifuge, and then cured by heating or UV light irradiation or electron beam radiation;

[0027] S3. Encapsulation molding: The upper part of the lens body 1 and the mirror 3 are connected together by high-temperature pressing or gluing or ultrasonic high-frequency welding or laser welding to form a firm whole.

[0028] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A quantum dot lens, characterized in that, It includes a lens body and a reflector. The lens body is a hollow cylinder or frustum, and the reflector is arranged on the upper bottom surface of the hollow cylinder or frustum. The lens body is a quantum dot fluorescent resin material layer. The thickness of each position of the lens body is uniform. The reflection mode of the reflector is specular reflection, random diffuse reflection or directional reflection with a Wiener surface structure.

2. The quantum dot lens according to claim 1, wherein The lower end of the lens body is fixedly connected to a base, and grooves and voids for heat dissipation are arranged at the lower end of the base.

3. A quantum dot lens according to claim 1, wherein Waterproof structure layers are arranged on the inner and outer sides of the lens body.

4. A backlight module, characterized in that, It includes: The quantum dot lens according to any one of claims 1 to 3; And an LED light source, which is arranged at the bottom of the cavity of the lens body.

5. A display device, characterized in that, It includes: A display panel, the quantum dot lens according to any one of claims 1 to 3; and an LED light source arranged at the bottom of the cavity of the lens body.

6. A method for fabricating a quantum dot lens, characterized in that, It includes the following steps: S1. Injection molding: Use a prefabricated mold and a specified optical resin material to produce a reflector by high-temperature injection molding. Incorporate quantum dot fluorescent materials into the specified optical resin material and produce the lens body by high-temperature injection molding. S2. Waterproof treatment: Coat liquid waterproof resin on the inner and outer surfaces of the lens body. Use the spraying method or the infiltration method to coat the waterproof resin. After coating, let it stand and spin dry with an air knife or a high-speed centrifuge, and then cure it by heating, UV light irradiation or electron beam radiation. S3. Encapsulation molding: Connect the upper part of the lens body and the reflector together by high-temperature pressing, gluing, ultrasonic high-frequency welding or laser welding to form a firm whole.

Images