CN212781603U - Quantum dot lens, backlight module and display device - Google Patents
Quantum dot lens, backlight module and display device Download PDFInfo
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- CN212781603U CN212781603U CN202022139777.XU CN202022139777U CN212781603U CN 212781603 U CN212781603 U CN 212781603U CN 202022139777 U CN202022139777 U CN 202022139777U CN 212781603 U CN212781603 U CN 212781603U
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Abstract
The utility model provides a quantum dot lens, backlight unit and display device belongs to reality technical field. The quantum dot lens includes: the first lens is of a convex lens structure and is provided with a first lens surface; a second lens having a concave lens structure and having a second lens surface opposite to the first lens surface; and a quantum dot fluorescent resin layer which is provided between the first lens surface and the second lens surface and contains one or more quantum dot fluorescent materials. According to the structure, the manufacturing process is simple, the mass production is easy, the quantum dot fluorescent material is saved, and the problems of poor consistency and blue light leakage of the existing quantum dot lens are solved.
Description
Technical Field
The present invention relates to a backlight technology of a display device, and more particularly, to a quantum dot lens, a backlight module and a display device including the same, and a method for manufacturing the same.
Background
Since the twenty-first century, the backlight technology has been developed rapidly, new technologies and new products are continuously provided, and the LED backlight has become the mainstream of the market. The quantum dot material is gradually paid attention, and particularly, the quantum dot fluorescent powder has a series of unique optical properties of adjustable spectrum along with size, narrow half-wave width of an emission peak, small Stokes displacement, high excitation efficiency and the like, and is widely concerned by the LED backlight industry. However, the existing quantum dot backlight module adopts a sandwich structure in which quantum dot fluorescent powder is sandwiched between two barrier films, and a large amount of expensive quantum dot fluorescent powder is required to be used. The quantum dot lens is coated with quantum dot fluorescent powder or pasted with a fluorescent film, the uniformity and consistency of light are poor, and the problem of blue light leakage is frequent.
The backlight module of the display device is divided into a direct type and a side type, and the direct type quantum dot backlight module mainly comprises optical films such as a white light LED lamp bar, a lens, a diffusion plate, a reflection film and a brightness enhancement film. The lens is used for diffusing the LED point light source into scattered light with the same degree as much as possible, and increasing the divergence angle of the LED light. With the progress of technology and the increasing demand of consumers, the advantage of high color rendering effect of the photoluminescent quantum dot material in the liquid crystal display is highlighted. The quantum dot material has the characteristics of high temperature resistance, water resistance, easiness in oxidation and the like, and how to better solve the problem of quantum dot failure under the background is the research direction of people, so that the use amount of quantum dots is reduced, and the cost is reduced.
The existing quantum dot lens is designed in an integrated mode, and is prepared by mixing a quantum dot material and a lens material together and performing injection molding, or a quantum dot lens is stacked in a 3D printing mode. The waterproof barrier layer of one deck is done on the top layer of quantum dot lens, and above-mentioned two kinds of schemes are very poor in the aspect of the oxygen of blocking water, and the cost of manufacture is very high moreover, and the second kind 3D prints the inefficiency of scheme and is difficult to the volume production. Due to the fact that light emitted by the quantum dots in a stimulated mode is the same, the quantum dot lens has the obvious defects of low light emitting efficiency, poor light spot shape, poor visual effect and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a make for solving the above-mentioned problem point that exists among the prior art, its aim at provides a quantum dot lens backlight unit and preparation method, can keep the homogeneity and the uniformity of light, effectively prevents that luminous efficiency is low, leak blue light scheduling problem.
To achieve the above object, the present invention provides a quantum dot lens, which includes: the first lens is of a convex lens structure and is provided with a first lens surface; a second lens having a concave lens structure and having a second lens surface opposite to the first lens surface; and a quantum dot fluorescent resin layer which is provided between the first lens surface and the second lens surface and contains one or more quantum dot fluorescent materials.
In addition, it is preferable that a first lens surface of the first lens and a second lens surface of the second lens are spaced apart by a fixed pitch.
In addition, it is preferable that irregular concave-convex points are formed on the first lens surface and/or the second lens surface, and the irregular concave-convex points have at least one shape of a diffused micro pyramid, a circle, or an ellipse.
In addition, it is preferable that the first lens includes a lens portion and a boss portion located below the lens portion, and a length of the boss portion is longer than a length of the lens portion in a horizontal direction.
In addition, it is preferable that the second lens includes a lens body and a base portion, the base portion is provided below the lens body, a groove portion is formed below the base portion, and an opening is formed in a portion of the groove portion corresponding to the second lens surface; the lens portion of the first lens passes through the groove portion and the opening and protrudes into the second lens, and the boss portion of the first lens protrudes into the groove portion.
In addition, it is preferable that a tapered recess is provided on an upper side of the lens body of the second lens, and a surface of the tapered recess serves as an exit surface of the backlight.
In addition, still provide a backlight unit, it includes: a quantum dot lens as described above; and the LED light source is positioned below the first lens of the quantum dot lens.
In addition, there is also provided a display device including: a display panel; a quantum dot lens as described above; and the LED light source is positioned below the first lens of the quantum dot lens.
In addition, a quantum dot lens manufacturing method is also provided, which includes: a lens injection molding step of respectively manufacturing a first lens and a second lens by using a prefabricated mold and a specified optical resin material through high-temperature injection molding; a laser etching step of performing laser etching on a part where the upper surface of the boss part of the first lens is in contact with the lower surface of the groove part of the second lens to form an overflow texture; injecting quantum dot fluorescent resin, enabling a second lens surface of the second lens to face upwards, and coating a proper amount of liquid quantum dot fluorescent resin on the second lens surface; a packaging and pressure maintaining step, wherein a lens part of the first lens is slowly pressed into the second lens through the groove part and the opening towards the second lens, and all air in a cavity between the first lens surface and the second lens surface needs to be exhausted in the pressing process; and a light curing step of irradiating the assembled first lens and second lens with a UV light source to cure the liquid quantum dot fluorescent resin between the first lens surface and the second lens surface.
Further, it is preferable that the method further comprises: a secondary packaging step of irradiating with a first laser beam after the photocuring step, so that a spot area of the laser beam is larger than a projection area of the second lens surface on the first lens, and a molten pool is formed on the surface layers of the first lens surface and the second lens surface of the laser action region; then, the molten pool is further enlarged by the second laser beam irradiation, and the gas generated in the gap is volatilized while the gap is eliminated.
According to as above the utility model discloses, the encapsulated quantum dot fluorescent resin in the cavity between first lens and the second lens, the contact surface that cavity and quantum dot fluorescent resin glued the contact is smooth lens face or has the optical surface of special microstructure, helps quantum dot fluorescent material to be aroused the back and keep the homogeneity and the uniformity of light in each angle, makes the uniformity of current quantum dot lens not good, leak blue light scheduling problem. The utility model provides a quantum dot lens, manufacturing method process is simple, and easily volume production saves quantum dot fluorescent material.
Drawings
Fig. 1 is a schematic diagram showing a specific structure of a quantum dot lens according to the present invention.
Fig. 2 is a schematic diagram showing a specific structure of a first lens in a quantum dot lens according to the present invention.
Fig. 3 is a schematic diagram showing a specific structure of a second lens in the quantum dot lens according to the present invention.
Fig. 4 is a flowchart showing a method for manufacturing a quantum dot lens according to the present invention.
1. A first lens; 11 a lens part; 12. a boss portion; 13: a first lens surface; 2. a quantum dot fluorescent resin layer; 3. a second lens; 31. a tapered recess; 32: a second lens surface; 33: a lens body; 34: a base part; 35; a bracket part; 36: groove portion, 37: and (6) opening holes.
Detailed Description
Advantages and features of the present patent and methods of accomplishing the same will be set forth below by way of the following examples described with reference to the accompanying drawings. This patent may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this patent will be thorough and complete, and will fully convey the scope of the patent to those skilled in the art.
Fig. 1 is a schematic diagram showing a specific structure of a quantum dot lens according to the present invention. As shown in fig. 1, the quantum dot lens of the present invention includes a first lens 1, a second lens 3, and a quantum dot fluorescent resin layer 2 disposed between the first lens 1 and the second lens 3. Wherein, the first lens 1 is a convex lens structure and has a convex first lens surface 13; the second lens mirror 3 is a concave lens structure having a concave second lens surface 32.
Preferably, the first lens surface 13 of the first lens 1 and the second lens surface 32 of the second lens 3 are disposed at a constant pitch, and the quantum dot fluorescent resin layer 2 is formed by disposing the quantum dot fluorescent resin in a cavity formed between the first lens surface 13 and the second lens surface 32. The quantum dot fluorescent resin contains one or more quantum dot fluorescent materials that can be excited by illumination light. The first lens surface 13 of the first lens 1 and the second lens surface 32 of the second lens 3 may be provided at a predetermined non-constant pitch.
When the quantum dot lens is applied to a backlight module of a display device, illumination light emitted by an LED light source positioned below the first lens 1 firstly enters the first lens 1 of the quantum dot lens. The illumination light passes through the first lens 1, is emitted from the first lens surface 13 of the first lens 1, and enters the quantum dot fluorescent resin layer 2. When the incident illumination light encounters the quantum dot fluorescent material in the quantum dot fluorescent resin layer 2, the quantum dot fluorescent material is excited to emit light with a color corresponding to the quantum dot fluorescent material, and the light enters the second lens 2 through the second lens surface 32 and then is emitted from the exit surface of the second lens 2 to form the backlight of the backlight module.
Fig. 2 is a schematic diagram showing a specific structure of a first lens in the quantum dot lens according to the present invention. As shown in fig. 2, the first lens 1 as a convex lens includes a lens portion 11 and a boss portion 12, the lens portion 11 includes a first lens surface 13, the boss portion 12 is provided below the lens portion 11, and the diameter of the boss portion 12 is larger than the maximum diameter of the lens portion 11 in the horizontal direction.
Fig. 3 is a schematic diagram showing a specific structure of a second lens in the quantum dot lens according to the present invention. As shown in fig. 3, the second lens 3 as a concave lens includes a lens body 33 having a concave second lens surface 32 and a base portion 34, the base portion 34 is disposed below the lens body 33, and both are made of a transparent material. A groove portion 36 is formed on the lower side of the base portion 34, and an opening 37 is formed in a portion of the groove portion 36 corresponding to the second lens surface 32, so that the lens portion 11 of the first lens 1 can be inserted into the second lens 3 through the groove portion 36 and the opening 37. Also, the boss portion 12 of the first lens 1 is provided to be fitted with the groove portion 36 for sealing.
Further, a plurality of holder portions 35 may be provided on the lower peripheral portion of the base portion 34, and the holder portions 35 may be used to mount and fix the quantum dot lens. A tapered recess 31 may be provided on the upper side of the lens body 33, and the surface of the tapered recess 31 may serve as an exit surface of the backlight. However, instead of the tapered concave portion 31, a concave portion having another shape may be formed, or a planar backlight emitting surface may be formed.
Further, an overflow portion for overflowing the quantum dot fluorescent resin may be formed in a part where the upper surface of the boss portion 12 of the first lens 1 and the lower surface of the groove portion 36 of the second lens 3 are in contact with each other, and for example, the overflow portion may be an overflow line formed on both the upper surface of the boss portion 12 and the lower surface of the groove portion 36.
Here, a process of assembling the first lens 1 and the second lens 3 is explained. Firstly, a proper amount of liquid quantum dot fluorescent resin is coated on the second lens surface 32 of the second lens 3, wherein the proper amount is enough to fill a cavity formed by combining the first lens 1 and the second lens 3, and the excessive overflow cannot cause waste. Then, the lens section 11 of the first lens 1 is caused to project into the second lens 3 toward the second lens 3 and through the opening hole 37 of the second lens 3 until the upper surface of the boss section 12 of the first lens 1 comes into close contact with the lower surface of the groove section 36 of the second lens section 3. At this time, it is arranged that a predetermined interval is maintained between the first lens surface 13 of the first lens 1 and the second lens surface 32 of the second lens 3 so that the quantum dot fluorescent resin can fill the cavity between the first lens surface 13 and the second lens surface 32. Further, since the upper surface of the boss portion 12 of the first lens 1 is brought into close contact with the lower surface of the groove portion 36 of the second lens portion 3, the quantum dot fluorescent resin can be prevented from flowing out from the above-mentioned cavity. In order to ensure that no air bubbles remain, the first lens 1 may be appropriately vibrated and/or rotated during the insertion process to separate out the micro air bubbles and discharge the micro air bubbles along the overflow path. Then, the liquid quantum dot fluorescent resin in the cavity is irradiated with UV light to be cured, thereby forming a solid quantum dot fluorescent resin layer 2. From this, accomplish the equipment of the quantum dot lens of the utility model relates to.
In addition, as a preferable configuration, the first lens surface 13 and/or the second lens surface 32 may be a smooth surface, or the first lens surface 13 and/or the second lens surface 32 may be a non-smooth surface, for example, a microstructure such as a diffusing micro pyramid, irregular uneven points such as a circle or an ellipse, or the like, which are all the same, may be formed. The non-smooth surface can enhance the adhesive force of the quantum dot fluorescent resin and enhance the light diffusion performance.
In the above embodiments, the first lens and the second lens may be made of glass material, organic glass, resin, or other transparent optical material.
Next, a method for manufacturing a quantum dot lens according to the present invention will be described in detail.
Fig. 4 is a flowchart showing a method for manufacturing a quantum dot lens according to the present invention. As shown in fig. 4, the method mainly includes a lens injection molding step S1, a laser etching step S2, a quantum dot fluorescent resin injection step S3, a packaging pressure maintaining step S4, and a photo-curing step S5.
In the lens injection molding step S1, the first lens 1 and the second lens 3 are respectively manufactured by high-temperature injection molding using a prefabricated mold and a predetermined optical resin material.
In the laser etching step S2, a part where the upper surface of the boss portion 12 of the first lens 1 and the lower surface of the groove portion 36 of the second lens 3 are in contact is laser etched to form an overflow pattern for overflowing the quantum dot fluorescent resin.
In the quantum dot fluorescent resin injection step S3, the second lens surface 32 of the second lens 3 is directed upward, and a suitable amount of liquid quantum dot fluorescent resin is applied to the second lens surface 32.
Then, in the packing pressure-holding step S4, the lens portion 11 of the first lens 1 is slowly pressed into the second lens 3 through the groove portion 36 and the opening 37 toward the second lens 3. In the process of pressing the first lens 1, it is necessary to completely discharge the air in the cavity between the first lens surface 13 and the second lens surface 32. The assembled first lens 1 and second lens 3 are preferably put into a pressure holding device for pressure holding, preferably for 1 to 20 seconds at a pressure of 1 to 5N.
In the photo-curing step S5, the assembled first lens 1 and second lens 3 are irradiated with a UV light source so that the liquid quantum dot fluorescent resin between the first lens surface 13 and the second lens surface 32 is cured. The UV light source irradiation time is preferably 1-10 s.
Furthermore, the method can further include a secondary packaging step S6, wherein after the photocuring step S5, the first laser beam is used to make the spot area of the laser beam larger than the projection area of the second lens surface 32 on the first lens 1, and the first laser beam is irradiated for 0.5-1.0S under the power condition of 250-300W to form a molten pool on the surface layers of the first lens surface 13 and the second lens surface 32 in the laser action region, so as to promote the volatilization of impurities or the dissolution in the molten pool, thereby further improving the uniformity of the laser action region. Then, the second laser beam is irradiated for 0.4 to 0.6 seconds under the conditions of 500 to 800W power and 3mm defocusing amount, so that the molten pool is further enlarged, the gap is eliminated, and the gas generated in the gap is volatilized. Therefore, the quantum dot lens subjected to the secondary packaging step S6 is more tightly combined, and water and oxygen resistance can be realized; through the laser melting of two bundles of different powers, when guaranteeing the encapsulation quality, still eliminated the quantum dot fluorescent resin glue that overflows in the course of working through heating, got rid of the air of doping, made the melting rear surface purer smooth. The light transmittance is better, and the astigmatism is more uniform.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (8)
1. A quantum dot lens, comprising:
the first lens is of a convex lens structure and is provided with a first lens surface;
a second lens having a concave lens structure and having a second lens surface opposite to the first lens surface; and
and a quantum dot fluorescent resin layer which is arranged between the first lens surface and the second lens surface and contains more than one quantum dot fluorescent material.
2. The quantum dot lens of claim 1,
the first lens surface of the first lens and the second lens surface of the second lens are separated by a fixed distance.
3. The quantum dot lens of claim 1 or 2,
irregular concave-convex points are formed on the first lens surface and/or the second lens surface, and the irregular concave-convex points are in the shape of at least one of a diffusion micro pyramid, a circle or an ellipse.
4. The quantum dot lens of claim 1 or 2,
the first lens includes a lens portion and a boss portion located below the lens portion, and a diameter of the boss portion is larger than a maximum diameter of the lens portion.
5. The quantum dot lens of claim 1 or 2,
the second lens comprises a lens body and a base part, the base part is arranged below the lens body, a groove part is arranged on the lower side of the base part, and an opening is arranged on the part of the groove part corresponding to the second lens surface;
the lens portion of the first lens passes through the groove portion and the opening and protrudes into the second lens, and the boss portion of the first lens protrudes into the groove portion.
6. The quantum dot lens of claim 5,
the upper side of the lens body of the second lens is provided with a conical concave part, and the surface of the conical concave part is used as an emergent surface of the backlight.
7. A backlight module, comprising:
the quantum dot lens of any one of claims 1 to 6; and
and the LED light source is positioned below the first lens of the quantum dot lens.
8. A display device, comprising:
a display panel, a display unit and a display unit,
the quantum dot lens of any one of claims 1 to 6; and the LED light source is positioned below the first lens of the quantum dot lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022139777.XU CN212781603U (en) | 2020-09-26 | 2020-09-26 | Quantum dot lens, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022139777.XU CN212781603U (en) | 2020-09-26 | 2020-09-26 | Quantum dot lens, backlight module and display device |
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| Publication Number | Publication Date |
|---|---|
| CN212781603U true CN212781603U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022139777.XU Active CN212781603U (en) | 2020-09-26 | 2020-09-26 | Quantum dot lens, backlight module and display device |
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| CN (1) | CN212781603U (en) |
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- 2020-09-26 CN CN202022139777.XU patent/CN212781603U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Quantum dot lens, backlight module and display device Effective date of registration: 20210819 Granted publication date: 20210323 Pledgee: Jiangsu Rugao Rural Commercial Bank Co.,Ltd. Xuean sub branch Pledgor: NANTONG VEEYEEI NEW MATERIAL TECHNOLOGY Co.,Ltd. Registration number: Y2021320010318 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20211008 Granted publication date: 20210323 Pledgee: Jiangsu Rugao Rural Commercial Bank Co.,Ltd. Xuean sub branch Pledgor: NANTONG VEEYEEI NEW MATERIAL TECHNOLOGY Co.,Ltd. Registration number: Y2021320010318 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |