CN108398829B - Backlight module based on quantum dots and manufacturing method thereof - Google Patents
Backlight module based on quantum dots and manufacturing method thereof Download PDFInfo
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- CN108398829B CN108398829B CN201810164050.1A CN201810164050A CN108398829B CN 108398829 B CN108398829 B CN 108398829B CN 201810164050 A CN201810164050 A CN 201810164050A CN 108398829 B CN108398829 B CN 108398829B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Abstract
The invention discloses a quantum dot-based backlight module, which comprises a light guide plate, quantum dot dots containing quantum dot materials, a reflector plate and a water-proof oxygen-isolating layer, wherein the quantum dot dots are arranged on the bottom surface of the light guide plate in an array mode, the reflector plate is packaged on the bottom surface of the quantum dot dots, the water-proof oxygen-isolating layer covers the surface, opposite to the surface where the quantum dot dots are located, of the reflector plate, and the projection of the quantum dot dots on the reflector plate is completely located in the reflector plate. The invention also discloses a manufacturing method of the backlight module. The quantum dot mesh points are sealed on the bottom surface of the light guide plate, the light guide plate is used as an upper layer Barrier, the reflector plate is used for blocking and using light at the bottom, the other Barrier at the bottom surface of the reflector plate is used for realizing water-resisting and oxygen-isolating functions, and the optical characteristic of the Barrier at the lower layer at the bottom surface of the reflector plate does not need to be considered, so that more varieties of materials can be selected, the application cost of quantum dot materials is reduced, and better water-resisting and oxygen-isolating effects can be ensured.
Description
Technical Field
The invention relates to the technical field of quantum dots, in particular to a backlight module based on quantum dots and a manufacturing method thereof.
Background
Due to the rapid development of the OLED (Organic Light Emitting Display) technology, the LCD (Liquid Crystal Display) faces a lot of challenges, and has certain weaknesses in thinning, contrast, color saturation, and the like compared with the OLED. In order to make LCDs rival OLEDs in these properties, more and more attention is paid to the technical challenge in these areas.
For example, in terms of Color saturation, the LCD is realized by adjusting Color Filter (CF, i.e., Color Filter) on the TFT Cell (thin film transistor liquid crystal panel), or by using a high Color saturation LED backlight source (e.g., an LED containing red and green phosphors, or an LED containing a multi-Color chip, or even in the form of quantum dots as phosphors). Among them, it is common to fabricate Quantum Dot (QD) materials in a membrane structure, such as the quantum dot membrane of 3M company.
Taking the lateral backlight structure as an example, the light of the blue light LED is transmitted through the light guide plate and then emitted into the quantum dot film, and the blue light excites the quantum dots to generate green light and red light, which are overlapped together to form white light. Above the quantum dot film, it is usually necessary to dispose other optical films such as Prism film (Prism film), diffusion film (diffusion film), etc. to achieve the effects of increasing front brightness and enhancing shielding property.
In order to realize thinner module design, research is focused on directly manufacturing the QD on the light emitting surface of the LGP, but the QD is limited by the problem that the QD is easy to contact with water vapor and oxygen to cause failure, and after the QD Layer is manufactured on the LGP, a water-proof oxygen-isolating Layer needs to be additionally added. If the Barrier Film (Barrier Film) is adopted for the water-proof oxygen-insulating layer, the cost is higher; if the Barrier resin layer is directly coated, the optical properties (optical transmittance and all-band absorption uniformity) of the conventional Barrier resin material are not satisfied. Therefore, there is a need to develop a new technique that can ensure the low cost of QD and the water and oxygen barrier effect of QD when QD is fabricated on LGP.
Disclosure of Invention
In view of the defects in the prior art, the invention provides the backlight module based on the quantum dots and the manufacturing method thereof, which can reduce the application cost of the quantum dot material and ensure better water and oxygen resisting effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a backlight unit based on quantum dot, includes the light guide plate, locates with array quantum dot site that contains the quantum dot material on the light guide plate bottom surface, encapsulate in the reflector plate of quantum dot site bottom surface and cover in on the reflector plate dorsad the water proof oxygen barrier on the face of quantum dot site, the quantum dot site is in projection on the reflector plate is located completely in the reflector plate.
As one embodiment, the backlight module based on quantum dots further includes a light-transmissive adhesive layer filled between the light guide plate and the reflective sheet and completely covering the quantum dot dots.
In one embodiment, the refractive index of the light-transmissive glue layer is less than 1.5.
As one embodiment, the quantum dot dots are formed by doping quantum dots with ink.
In one embodiment, the quantum dot coating is formed on the surface of the light guide plate.
In one embodiment, the water-barrier and oxygen-barrier layer is a mixture of one or more of acrylic, epoxy, and inorganic materials.
As one embodiment, the thickness of the water-resisting and oxygen-isolating layer is 10 um-1 mm.
In one embodiment, the water-blocking and oxygen-blocking layer is formed on the reflector plate by coating.
As an implementation manner, the surface of the reflection sheet facing the light guide plate is recessed to form a plurality of recessed portions, and each recessed portion is opposite to one quantum dot mesh point.
Another objective of the present invention is to provide a method for manufacturing a backlight module based on quantum dots, comprising:
providing a light guide plate;
manufacturing quantum dot mesh points on the bottom surface of the light guide plate;
coating a light-transmitting adhesive layer on the bottom surface of the light guide plate, and sealing the quantum dot mesh points on the bottom surface of the light guide plate;
a reflecting sheet is attached to the bottom surface of the light-transmitting adhesive layer;
and a water-resisting and oxygen-isolating layer covers the back surface of the reflector plate.
The quantum dot mesh points are sealed on the bottom surface of the light guide plate, the light guide plate is used as an upper layer Barrier, the reflector plate is used for blocking and using light at the bottom, the other Barrier at the bottom surface of the reflector plate is used for realizing water-resisting and oxygen-isolating functions, and the optical characteristic of the Barrier at the lower layer at the bottom surface of the reflector plate does not need to be considered, so that more varieties of materials can be selected, the application cost of quantum dot materials is reduced, and better water-resisting and oxygen-isolating effects can be ensured.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of another display device according to an embodiment of the invention;
FIG. 3 is a schematic view of a method for manufacturing a backlight module according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a display panel 1 based on quantum dots, a backlight module 2 and a light source 3 according to an embodiment of the present invention, the backlight module 1 is disposed below the display panel 1 and provides a backlight source for the display panel 1. The backlight module 2 mainly includes a light guide plate 10, quantum dot dots 20 containing quantum dot materials arranged on the bottom surface of the light guide plate 10 in an array manner, a reflector sheet 30 packaged on the bottom surface of the quantum dot dots 20, and a water-proof oxygen-barrier layer 40 covering the surface of the reflector sheet 30 opposite to the quantum dot dots 20, the backlight module 2 may further include an optical film group 60 located between the light guide plate 10 and the display panel 1, the projection of the quantum dot dots 20 on the reflector sheet 30 is completely located within the outline range of the reflector sheet 30, that is, the reflector sheet 30 has a large enough area to at least completely shield the quantum dot dots 20.
Here, the light guide plate 10 is preferably made of glass, polymethyl methacrylate (PMMA), styrene-methyl methacrylate copolymer (MS), or other materials as an upper layer Barrier of the quantum dot dots 20, and has good water and oxygen Barrier properties, and can protect the quantum dot dots 20.
The reflective sheet 30 is fully attached under the transparent adhesive layer 50 to ensure no air layer. Specifically, a light-transmitting adhesive layer 50 with a low refractive index is filled between the light guide plate 10 and the reflective sheet 30, the light-transmitting adhesive layer 50 completely covers the quantum dot dots 20, and all the quantum dot dots 20 are encapsulated therein. Preferably, the refractive index of the light-transmissive glue layer 50 is less than 1.5, and more preferably, the refractive index is less than 1.4, which does not substantially affect the original light-guiding function of the light-guiding plate 10.
The light source 3 on the side of the light guide plate 10 emits light toward the end face of the light guide plate 10, a part of the light is transmitted in the light guide plate 10 and then is incident toward the quantum dot mesh points 20 at the bottom, and after being excited, the quantum dot mesh points 20 are equivalent to another group of light sources on the bottom face of the light guide plate 10, so that extra backlight light is provided for the light guide plate 10, and the backlight brightness is greatly improved. One part of light rays generated by the excitation of the quantum dot dots 20 directly enter the light guide plate 10, the other part of the light rays are emitted to the reflector plate 30 through the light-transmitting adhesive layer 50, and the reflector plate 30 reflects the received light rays back to the light guide plate 10, so that all the light rays excited from the quantum dot dots 20 enter the light guide plate 10, and the backlight brightness and the uniformity are ensured.
Specifically, when the quantum dot dots 20 are manufactured, the quantum dot dots 20 are formed by doping quantum dots and ink, and a patterned quantum dot and ink doping material is coated on the bottom surface of the light guide plate 10, so that a dot pattern with both scattering dot and quantum dot excitation functions can be formed in an array.
The water-resisting oxygen-isolating layer 40 is made of one or more of acrylic, epoxy resin and inorganic materials, and can be directly coated on the reflector sheet 30, and has a thickness of 10 um-1 mm and a water vapor transmission rate of less than 10-1g/(m224h), oxygen transmission rate < 10-1cm3/(m224 h.0.1 MPa). The water-proof oxygen-isolating layer 40, the reflector plate 30 and the light-transmitting adhesive layer 50 of the embodiment are respectively basically flush with the end surface of the light guide plate 10, and the peripheral ends of the reflector plate 30 can be folded to surround the light-transmitting adhesive layer 50 to shield and reflect light emitted from the end surface of the light-transmitting adhesive layer 50, so that light leakage is avoided.
Because the reflector sheet 30 is formed between the quantum dot dots 20 and the water-resisting and oxygen-isolating layer 40, the water-resisting and oxygen-isolating layer 40 does not need to have harsh optical characteristics such as optical transmittance and full-wave-band absorption uniformity, and therefore, the reflector sheet can be made of cheaper materials, and the manufacturing cost of products is saved.
As shown in fig. 2, as another embodiment, the reflective sheet 30 of the present embodiment is slightly different from the reflective sheet 30 of the previous embodiment, and a plurality of concave portions 300 are formed on the surface of the reflective sheet 30 facing the light guide plate 10, wherein each concave portion 300 is opposite to one quantum dot 20. The concave portions 300 are preferably of an arc-shaped structure, and the outline size of each concave portion 300 is larger than that of the corresponding quantum dot 20, a part of light rays generated by excitation of the quantum dot 20 are emitted to the reflective sheet 30 by the transparent adhesive layer 50, and the light rays emitted into the concave portions 300 are reflected back to the light guide plate 10 in a converging manner.
As shown in fig. 3, correspondingly, the present invention further provides a method for manufacturing a backlight module based on quantum dots, comprising:
s01, providing a light guide plate 10, wherein the light guide plate 10 is used as an upper layer Barrier of the quantum dot dots 20, and preferably adopts materials such as glass, polymethyl methacrylate (PMMA), styrene-methyl methacrylate copolymer (MS) and the like;
s02, manufacturing quantum dot dots 20 on the bottom surface of the light guide plate 10, wherein the quantum dot dots 20 are formed by doping quantum dots and printing ink, and when the quantum dot dots 20 are manufactured, a layer of patterned doping materials of the quantum dots and the printing ink is coated on the bottom surface of the light guide plate 10;
s03, coating a transparent adhesive layer 50 on the bottom surface of the light guide plate 10 to seal the quantum dot dots 20 on the bottom surface of the light guide plate 10, wherein the transparent adhesive layer 50 is a glue with a lower refractive index, and the refractive index is less than 1.5, and more preferably, the refractive index is less than 1.4;
s04, attaching the reflection sheet 30 to the bottom surface of the light-transmitting adhesive layer 50;
s05, covering the back of the reflector plate 30 with a water-proof and oxygen-proof layer 40, wherein the water-proof and oxygen-proof layer 40 is made of one or more of acrylic, epoxy resin and inorganic materials, and can be directly coated on the reflector plate 30, the thickness of the layer is 10 um-1 mm, and the water vapor transmission rate is less than 10 m-1g/(m224h), oxygen transmission rate < 10-1cm3/(m2·24h·0.1MPa)。
Because the light guide plate of this application itself has better water proof and separates the oxygen characteristic, its upper Barrier as the quantum dot site can reduce the special Barrier of one deck, and simultaneously, because the reflector plate forms between quantum dot site and water proof and separate the oxygen layer, the water proof separates the oxygen layer and need not possess optical transmittance, harsh optical properties such as full-wave band absorption homogeneity, consequently, can adopt cheaper material to make, the cost of manufacture of product has further been practiced thrift, the application cost of quantum dot material has been reduced, and can guarantee better water proof and separate the oxygen effect.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (9)
1. The backlight module based on the quantum dots is characterized by comprising a light guide plate (10), quantum dot dots (20) which are arranged on the bottom surface of the light guide plate (10) in an array manner and contain quantum dot materials, a reflector plate (30) which is packaged on the bottom surface of the quantum dot dots (20) and a water-proof oxygen-isolating layer (40) which covers the surface, opposite to the surface where the quantum dot dots (20) are located, of the reflector plate (30), wherein the projection of the quantum dot dots (20) on the reflector plate (30) is completely located in the reflector plate (30); the surface of the reflector plate (30) facing the light guide plate (10) is recessed to form a plurality of recessed portions (300) with arc-surface structures, each recessed portion (300) is opposite to one quantum dot mesh point (20), and the outline size of each recessed portion (300) is larger than that of the corresponding quantum dot mesh point (20).
2. The backlight module as claimed in claim 1, further comprising a light transmissive glue layer (50), wherein the light transmissive glue layer (50) is filled between the light guide plate (10) and the reflective sheet (30) and completely covers the quantum dot dots (20).
3. The quantum dot based backlight module of claim 2, wherein the refractive index of the light transmissive glue layer (50) is less than 1.5.
4. The backlight module as claimed in claim 3, wherein the quantum dot dots (20) are formed by doping quantum dots with ink.
5. The backlight module as claimed in claim 4, wherein the quantum dot dots (20) are coated on the surface of the light guide plate (10).
6. The backlight module as claimed in claim 1, wherein the water and oxygen barrier layer (40) is one or more of acrylic, epoxy, and inorganic.
7. The backlight module based on quantum dots according to claim 6, wherein the thickness of the water and oxygen isolating layer (40) is 10 um-1 mm.
8. The quantum dot-based backlight module of claim 6, wherein the water and oxygen barrier layer (40) is coated on the reflective sheet (30).
9. A method for manufacturing the backlight module based on quantum dots according to any one of claims 2 to 8, comprising:
providing a light guide plate (10);
manufacturing quantum dot mesh points (20) on the bottom surface of the light guide plate (10);
coating a light-transmitting adhesive layer (50) on the bottom surface of the light guide plate (10), and sealing the quantum dot mesh points (20) on the bottom surface of the light guide plate (10);
a reflecting sheet (30) is attached to the bottom surface of the light-transmitting adhesive layer (50);
and a water-proof and oxygen-isolating layer (40) covers the back surface of the reflector plate (30).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810164050.1A CN108398829B (en) | 2018-02-27 | 2018-02-27 | Backlight module based on quantum dots and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810164050.1A CN108398829B (en) | 2018-02-27 | 2018-02-27 | Backlight module based on quantum dots and manufacturing method thereof |
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| CN108398829B true CN108398829B (en) | 2021-03-02 |
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| CN111627345B (en) * | 2020-06-09 | 2022-05-03 | 上海天马微电子有限公司 | Display panel, manufacturing method thereof and display device |
| CN114002883A (en) * | 2021-11-26 | 2022-02-01 | 深圳康佳电子科技有限公司 | Quantum dot light guide plate and backlight display module |
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|---|---|---|---|---|
| US20120113672A1 (en) * | 2008-12-30 | 2012-05-10 | Nanosys, Inc. | Quantum dot films, lighting devices, and lighting methods |
| CN105698047A (en) * | 2016-04-19 | 2016-06-22 | 吴冬梅 | Backlight module |
| CN105929480A (en) * | 2016-04-12 | 2016-09-07 | 苏州星烁纳米科技有限公司 | Novel light guide plate and application thereof |
| CN106773322A (en) * | 2017-02-22 | 2017-05-31 | 深圳市华星光电技术有限公司 | Backlight module and double side liquid crystal display |
| CN206248879U (en) * | 2016-12-22 | 2017-06-13 | 鸿汉（厦门）科技有限公司 | A kind of backlight module and display device |
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2018
- 2018-02-27 CN CN201810164050.1A patent/CN108398829B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120113672A1 (en) * | 2008-12-30 | 2012-05-10 | Nanosys, Inc. | Quantum dot films, lighting devices, and lighting methods |
| CN105929480A (en) * | 2016-04-12 | 2016-09-07 | 苏州星烁纳米科技有限公司 | Novel light guide plate and application thereof |
| CN105698047A (en) * | 2016-04-19 | 2016-06-22 | 吴冬梅 | Backlight module |
| CN206248879U (en) * | 2016-12-22 | 2017-06-13 | 鸿汉（厦门）科技有限公司 | A kind of backlight module and display device |
| CN106773322A (en) * | 2017-02-22 | 2017-05-31 | 深圳市华星光电技术有限公司 | Backlight module and double side liquid crystal display |
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