CN109901329B

CN109901329B - Backlight module, quantum dot film and manufacturing method thereof

Info

Publication number: CN109901329B
Application number: CN201910292419.1A
Authority: CN
Inventors: 王兵
Original assignee: Najing Technology Corp Ltd
Current assignee: Najing Technology Corp Ltd
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2021-09-17
Anticipated expiration: 2039-04-12
Also published as: CN109901329A

Abstract

A backlight module, a quantum dot film and a manufacturing method thereof belong to the field of displays. The quantum dot film comprises a first blocking layer, a quantum dot layer and a second blocking layer, wherein the first blocking layer, the quantum dot layer and the second blocking layer are in layered layout in a first preset direction. The quantum dot film further includes: template layer, first improvement layer. The template layer is provided with a plurality of unit cells and is arranged between the first barrier layer and the second barrier layer; the first improvement layer includes a light conditioning layer. The first improvement layer and the quantum dot layer are combined and filled in the plurality of unit cells in a layered and superposed manner in a first preset direction. The quantum dot film in the example is applied to the backlight module, so that the problem of transverse light leakage can be effectively reduced.

Description

Backlight module, quantum dot film and manufacturing method thereof

Technical Field

The application relates to the field of displays, in particular to a backlight module, a quantum dot film and a manufacturing method of the quantum dot film.

Background

The lcd is a non-self-luminous display device, and therefore, it needs a backlight source to achieve the display function. The quality of the backlight source directly affects the display quality of the liquid crystal display. The cost of the backlight source is about 3% -5% of the cost of the lcd module, and the power consumption thereof is about 75% of the cost of the lcd module, so the backlight source is an important component of the lcd module.

Currently, liquid crystal displays are generally not high in color gamut, and thus have limited applications. To improve the color gamut, quantum dot backlights have come into play. The quantum dot backlight source can improve the color gamut of a display product to 100%, so that the expressive ability of the display product is greatly enriched.

However, the existing quantum dot backlight also has some problems to be solved, for example.

1. The thickness uniformity is not easy to control.

2. The color coordinate and the brightness of a bad area can not be tested and repaired in the manufacturing process to improve the yield;

3. the quantum dots are easy to be eroded, so that the light intensity of an eroded area is too high, and the whole picture quality of the display is influenced.

The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

Based on the defects of the prior art, the application provides a backlight module, a quantum dot film and a manufacturing method thereof, so as to partially or completely improve or even solve the problems.

The application is realized as follows:

in a first aspect, examples of the present application provide a quantum dot film.

The quantum dot film comprises a first blocking layer, a quantum dot layer and a second blocking layer, wherein the first blocking layer, the quantum dot layer and the second blocking layer are in layered layout in a first preset direction.

The quantum dot film further includes:

the template layer is provided with a plurality of unit cells and is arranged between the first barrier layer and the second barrier layer;

a first improvement layer comprising a light conditioning layer;

the first improvement layer and the quantum dot layer are combined and filled in the plurality of unit cells in a layered and superposed manner in a first preset direction.

The quantum dot film in the example has a template layer provided with cells. The unit cells of the template layer can be limited so as to play a role in restraining the first improvement layer, the quantum dot layer and the like distributed in the unit cells. And the thickness of the quantum dot film can be controlled according to the template layer, so that the thickness, the flatness and the like of the quantum dot film are effectively controlled. The light adjusting layer can adjust the light emitting condition of the quantum dot film, so that the light emitting condition of each region is more uniform, and color cast is avoided.

In combination with the first aspect, in some optional examples of the first possible implementation of the first aspect of the present application, the first improvement layer further comprises a light extraction layer, and the light extraction layer is located between the light modulation layer and the quantum dot layer.

The light extraction layer can play a role in improving the light extraction rate and the light intensity, so that the brightness of the quantum dot film is improved.

With reference to the first aspect, in some optional examples of the second possible implementation manner of the first aspect of the present application, the first improvement layer further includes a light guide layer, and the light adjustment layer and the light guide layer are respectively located on two sides of the quantum dot layer in the first preset direction.

The light guide layer can guide the track of light to a proper area, so that the problems of light leakage and uneven light emission are avoided to a certain extent.

In combination with the first aspect, in some optional examples of the third possible implementation of the first aspect of the present application, the quantum dot film includes a second improvement layer, the second improvement layer including a drying layer and/or a light absorbing layer disposed in a second preset direction;

the template layer comprises a first filling area and a second filling area, and the first filling area is surrounded by the second filling area in a second preset direction;

the first improvement layer and the quantum dot layer are combined and filled in the plurality of unit cells of the first filling area, and the second improvement layer is filled in the plurality of unit cells of the second filling area.

The second improvement layer can play a role in isolating external influence factors (such as water vapor, oxygen and the like), so that the quantum dot layer serving as a luminous source is protected to a certain extent, and the side light leakage of the quantum dot film is prevented.

In combination with the third possible embodiment of the first aspect, in some alternative examples of the fourth possible embodiment of the first aspect of the present application, the second improving layer includes a drying layer and a light absorbing layer;

the second filling area is provided with an inner side close to the first filling area and an outer side far away from the first filling area;

the drying layer is filled inside the second filling area, and the light absorption layer is filled outside the second filling area.

The light absorption layer and the drying layer are distributed at the relative positions, so that the functional layout of the second improvement layer is more reasonable and effective, and the function of the quantum dot film is ideally improved.

In combination with the first aspect, in some optional examples of the fifth possible implementation manner of the first aspect of the present application, the material of the light adjustment layer includes a light adjustment carrier, and a filter material dispersed and cured in the light adjustment carrier, the filter material being uniformly distributed in the light adjustment carrier;

optionally, the light conditioning carrier comprises a light-curable glue or a heat-curable glue;

optionally, the filter material includes one or more of a red filter ink, a green filter ink, a blue filter ink, and a black filter ink.

Depending on the different choice of material from which the light regulating layer is made, it may perform various desired functions and effects.

In a second aspect, embodiments of the present application provide a method for manufacturing a quantum dot film.

The manufacturing method comprises the following steps:

s1, providing a substrate provided with a first barrier layer;

s2, manufacturing a template layer with a plurality of unit cells on the surface of the first barrier layer, wherein the template layer comprises a first filling area and a second filling area, and the first filling area is surrounded by the second filling area in a second preset direction;

s3, arranging a quantum dot layer on the first part of the first filling area by adopting a wet method;

s4, arranging a light adjusting layer on the second part of the first filling area by adopting a wet method;

s5, arranging a second barrier layer on the side of the template layer far away from the first barrier layer;

wherein the quantum dot layer and the light adjusting layer are laminated in a first preset direction.

Through proper process selection, all steps of the manufacturing method are executed in sequence, and the high-quality quantum dot film can be manufactured with high yield and efficiency.

In combination with the second aspect, in some optional examples of the first possible implementation manner of the second aspect of the present application, the following steps are further included between steps S2 and S3:

a light guiding layer is disposed in the plurality of unit cells between the quantum dot layer and the first blocking layer.

The light guide layer guides light to avoid the problems of light leakage and uneven light emission.

In combination with the second aspect, in some optional examples of the second possible implementation manner of the second aspect of the present application, the following steps are further included between steps S3 and S4:

a light extraction layer is disposed in the plurality of cells between the light modulation layer and the quantum dot layer.

The light extraction layer has a positive effect on promoting the brightness of the quantum dot film, and the aforementioned effect can be achieved mainly by improving the light extraction rate and the light intensity.

In combination with the second aspect, in some optional examples of the third possible implementation manner of the second aspect of the present application, the following steps are further included between steps S4 and S5:

arranging a drying layer and a light absorption layer on the inner side and the outer side of the second filling area by adopting a wet method;

optionally, the drying layer is filled inside the second filling region, and the light absorbing layer is filled outside the second filling region.

The second improvement layer plays a role in isolating undesirable influence factors such as moisture, oxygen and the like, so that the quantum dot layer can be protected and the quantum dots can be prevented from being corroded.

In a third aspect, examples of the present application provide a backlight module.

The backlight module comprises the quantum dot film or the quantum dot film manufactured by the manufacturing method of the quantum dot film.

Since the quantum dot film has the above functions, for example, the thickness and the flatness are uniformly controllable.

In the above implementation process, the quantum dot film provided by the embodiment of the application has the template layer and the first improvement layer, which have respective corresponding functions and cooperate together to realize beneficial improvement on the performance of the quantum dot film without affecting each other.

Secondly, 1), the quantum dot film prints the quantum dot layer in the cell frame, so that the thickness uniformity of the quantum dot layer is ensured, and meanwhile, the chromaticity coordinate is indirectly controlled without large deviation. 2) The chromaticity coordinate and the brightness of the quantum dot light conversion film can be effectively adjusted by printing and manufacturing the light adjusting layer. 3) The problem of invalid edges is not easy to occur in the auxiliary functional layer, so that the quantum dot light conversion film has a long service life.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the prior art of the present application, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic structural view of a backlight film given in an example of the present application;

fig. 2 shows a schematic cross-sectional structure of a quantum dot film given in the examples of the present application;

fig. 3 shows a schematic diagram of a relative distribution structure of a first filling region and a second filling region in a top-view angle quantum dot film given in an embodiment of the present application;

fig. 4 shows a schematic structural diagram of a top view angle of a template layer in a quantum dot film given in an embodiment of the present application;

fig. 5 shows a schematic view of the light scattering principle of the light guiding layer in the quantum dot film given in the embodiment of the present application.

Icon: 100-a backlight film; 101-lower barrier film; 102-a quantum dot structure layer; 103-an upper barrier film; 200-quantum dot films; 202-a first barrier layer; 203-a template layer; 2031-cell; 204-a light guiding layer; 205-quantum dot layer; 206-a light extraction layer; 207-a light-regulating layer; 208-drying the layer; 209-light absorbing layer; 210-an adhesive layer; 211-a second barrier layer; 302-a first fill area; 303-second fill area.

Detailed Description

Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The demand for high color gamut of liquid crystal displays has prompted the quantum dot backlight technology. In practice, the quantum dot backlight technology can even improve the color gamut of display products to 100%, thereby greatly enriching the expressive power of the display products. Due to the obvious advantages of the quantum dot backlight source technology, the quantum dot backlight source technology has potential huge application value.

However, although the quantum dot backlight technology has the above advantages, there are some problems to be solved, such as will be shown in the following descriptions.

Referring to fig. 1, in a study, the inventors realized a film with luminescent properties using quantum dots (although belonging to a quantum dot-based film, this may be referred to herein or as a backlight film 100 in order to distinguish it from a quantum dot film 200 given later in the examples of the present application).

The backlight film 100 is formed by combining upper and lower barrier layers with an intermediate quantum dot structure layer 102. That is, the backlight film 100 includes an upper barrier film 103, a quantum dot structure layer 102, and a lower barrier film 101 sequentially arranged. Here, the terms "upper" and "lower" are merely used to indicate relative positions between different structures, and are not particularly limited. The above and below are described in the orientation of the figure (header side/top is up, footer side/bottom is down).

The barrier layers (including the upper barrier layer and the lower barrier layer) can block external water and oxygen from entering the quantum dot structure layer 102, so as to protect the quantum dots.

The barrier layer is generally formed by plating an inorganic layer (e.g., a silicon oxide layer, a silicon nitride layer, or an aluminum oxide layer) on a PET (polyethylene terephthalate) substrate by sputtering, vapor deposition, or the like. Since the barrier layer is usually produced in a roll form, the thickness thereof is generally between 20 and 50nm in consideration of the limitations of equipment and processes.

The quantum dot structure layer 102 can emit light when excited by energy (e.g., light, heat, electric energy, etc.). That is, the quantum dot structure layer 102 is used as a light source. The quantum dot structure layer 102 may be formed by spin coating, blade coating, or the like. The material may be a light conversion composition formed by mixing RG quantum dots (red quantum dots, green quantum dots) and a resin-based UV adhesive (ultraviolet curing adhesive) in a ratio.

Thus, the above-described backlight film 100 can be prepared by:

manufacturing a lower barrier film 101;

coating the light conversion composition on the lower barrier layer by a coating or blade coating apparatus to form a quantum dot structure layer 102;

the upper barrier film 103 is attached to the quantum dot structure layer 102 and then cured and encapsulated by UV curing equipment.

In order to evaluate the quality of the backlight film 100, a certain test is required and the quality is measured by an appropriate index. For example, the evaluation of the Color gamut (Color Space) may involve the CIE1931 RGB Color gamut chromaticity diagram given by the CIE international commission on illumination or the CIE1931XYZ chromaticity diagram of the modified CIE-XYZ Color system, which is capable of showing the entire Color gamut that the human eye can feel.

For ease of understanding, the knowledge of the chromaticity diagram is set forth herein as follows:

the three primary colors (red, green and blue, or RGB) can synthesize all colors including monochromatic light. The brightness of the three primary colors is different when different light to be matched is achieved, and the color equation C ═ R (R) + G (G) + B (B) is used for representing the different light to be matched. Where (R), (G), and (B) represent the unit amounts of the three primary colors red, green, and blue that produce the mixed color, and R, G, B are the number of the three primary colors red, green, and blue, respectively, that are needed to match the color to be matched, and are called tristimulus values. The coordinate of each monochromatic light with equal energy in RGB three-dimensional space is respectively obtained by using tristimulus values, and a CIE1931xyz chromaticity diagram is obtained. And R, G, B three colors are distributed in different three directions in a chromaticity diagram, and the near-middle position of the three colors in the chromaticity diagram is a white light region.

Based on the above, in order to check the performance of the backlight film 100, it can be determined whether the light source meets its own requirements by testing the coordinate value of the white light emitting region with a spectrometer. If the deviation occurs, the color coordinate value can be shifted to the range meeting the requirement by increasing the amount of a certain color in the tristimulus values.

In the course of implementing the above backlight film 100, the inventors found that some of the following problems resulted in a reduction in the performance of the product, even being unusable.

For example, 1, the thickness uniformity of the backlight film 100 is difficult to control during the manufacturing process.

2. Testing of the backlight film 100 is performed after fabrication is complete and is difficult to correct if a problem is found. The concrete expression is as follows: the testing cannot be performed during the manufacturing process, and the color coordinates and brightness of the defective region cannot be corrected during the process, thereby resulting in a low yield of the product.

3. The backlight film 100 has poor side protection effect, and edge quantum dots are easily eroded due to the penetration of water and oxygen at the side, so that the blue light in an eroded area is too strong, and the overall picture quality of the display is affected.

In view of the above, the inventors have made some useful experimental studies on the above problems, and have desired to propose solutions to improve or solve one or more of the above problems. As a result of research, the inventors believe that at least partial solutions have been found to alleviate the problems caused by the above-mentioned situation, and practice has proven that such solutions are effective and advantageous to implement.

Therefore, as an optional expression form of the above solution, the embodiment of the present application provides a backlight module, a quantum dot film 200, and a manufacturing method thereof. It improves one or more of the thickness unevenness of the quantum dot film 200, the edge leakage of blue light, and the detection and repair of the color coordinates and brightness of the defective region in the related backlight module technology.

The backlight module, the quantum dot film 200 and the manufacturing method thereof according to the embodiment of the present application are specifically described as follows:

in a first part, a quantum dot film 200, see fig. 2.

Regarding the above-mentioned problems of the backlight film 100 shown in fig. 1, the inventors consider that it involves at least some of the following causes.

1. The thickness uniformity of the backlight film 100 is difficult to control during the manufacturing process.

In the related art, the quantum dot structure layer 102 is directly fabricated on the surface of the lower barrier film 101. Because no support and solvent fluidity exist, after the upper barrier layer is attached, the thickness of the cured film layer is high or low due to uneven external force.

Accordingly, the member having the supporting and flow-limiting functions is selected to be used for constraint in the example of the present application, so that the manufacturing raw material of the quantum dot layer 205 is supported and does not easily flow randomly during the process, the thickness uniformity of the subsequently manufactured film layer is maintained, and the flatness is higher.

Wherein the mentioned components will be mainly mentioned and explained hereinafter with the template layer 203.

2. The backlight film 100 cannot be tested during the manufacturing process, and the color coordinates and brightness of the defective region cannot be corrected during the process, resulting in a low yield of the product.

In the related art, the quantum dot structure layer 102 is manufactured by a full-surface coating method, and the quantum dot structure layer 102 has a larger fluidity (is not suitable for moving back and forth) before being cured. In addition, the thickness of the film layer is affected by the adhesion of the barrier film 103, so that a real test result of the quantum dot structure layer 102 cannot be obtained before the completion of the film.

In view of this problem, as described above, the quantum dot film 200 in the present example is provided with a member having a function of supporting and restricting flow. This member may constrain the flow of quantum dot layer 205 before curing, and thus, the device may move. Meanwhile, the member is a solid member that exists in reality, and the specific size thereof is determined, and thus, the thickness of the final product device may be determined. This makes it possible to smoothly perform the test and also to repair the color coordinates and luminance of the defective region.

It should be noted at first that in the related art, the mixture of three primary colors-especially for the field of quantum dots-mainly uses red and green quantum dots, and the blue quantum dots can be used as blue light providers in the mixture of three primary colors, and at the same time, can be used as excitation sources (excitation light) to excite the red and green quantum dots to generate red and green light. It should be noted that, in the related art, blue or blue-violet LEDs are usually selected as the backlight to excite red and green quantum dots.

Therefore, the blue light in the eroded region is more desirable than the non-eroded region (e.g., the brightness is not stronger). In terms of area, compared with the inner area, the red and green quantum dots at the edge part are more easily eroded by the permeated water and oxygen, so that the blue light which originally excites the eroded part of the quantum dots comes out to form redundant blue light, namely the blue light is too strong. Alternatively, in a possible scheme, among three-color quantum dots of red, green and blue, each or a plurality of quantum dots can also be considered to be selected as an excitation source to excite other quantum dots to emit light. In other words, in such schemes, the quantum dots themselves that are the excitation sources also double as providers of the primary colors in the three-primary color mixture. As mentioned above, blue light is used as an excitation source of red and green quantum dots, and also as a blue light source in RGB three primary colors.

One solution to this problem is: after the upper barrier film 103 is attached and cured, the area with thinner edges or defects is cut off in a cutting mode, so that the uniformity of the whole thickness and the uniformity of light intensity are ensured. Another solution is (the solution adopted in the example of the present application): adopt aforementioned 1, 2 proposed components, guarantee that the even solution thickness of thickness and roughness are inhomogeneous, can repair when above-mentioned defect appears simultaneously, avoid the too strong of blue light. In addition, the side edge of the film is protected by a protective structure to prevent the permeation and corrosion of water and oxygen, and the problem that the quantum dots are damaged is solved from the root.

The protective structure mentioned therein will be mentioned and explained hereinafter mainly in the context of the second improvement layer.

In addition, based on the need for improvement of other performances or functions of the quantum dot film 200, other functional structures (which will be described one by one in the following) may also be provided as needed to improve the performances of the quantum dot film 200 in various aspects.

In an alternative example, in general, the quantum dot film 200 includes a first barrier layer 202, a template layer 203, a filling layer, and a second barrier layer 211 that are layered in a first predetermined direction Y (e.g., a vertical direction).

The template layer 203 and the filling layer are both located between the first barrier layer 202 and the second barrier layer 211, and the filling layer is filled in the mesh that the template layer 203 has. Wherein, the filling layer can be a collection of a plurality of structural layers with different functions. For example, the filling layer includes a quantum dot layer 205, a light extraction layer 206, a light modulation layer 207, a drying layer 208, a light absorbing layer 209, and the like. Further, in order to facilitate the bonding of the first barrier layer 202 and the second barrier layer 211 to each other, a bonding structure may be further disposed therebetween.

In an alternative example, the quantum dot film 200 may include a first barrier layer 202, a template layer 203, a quantum dot layer 205, a first improvement layer, and a second barrier layer 211, see fig. 2.

Various structures will be described in greater detail below in conjunction with the drawings.

First, first barrier layer 202 (or top layer)

The first barrier layer 202 is generally made of a material having good light transmittance. The light transmittance thereof may be required to be 95% or more. First blocking layer 202 protects quantum dot layer 205, and simultaneously, it also blocks external water and oxygen from entering quantum dot layer 205, thereby protecting quantum dots in quantum dot layer 205.

The first barrier layer 202 may be made of various suitable materials, such as inorganic non-metals. Or for example a polymer, an illustrative example being PI (Polyimide). It can be formed by Film formation on a substrate using a Polyimide solution, and is therefore called a PI Film (Polyimide Film). For example, a PI solution is drawn down on a glass substrate to form a film. Further, if necessary, a silicon oxide layer, a silicon nitride layer, or an aluminum oxide layer may be formed on the surface of the PI film by sputtering, evaporation, coating, or the like to improve the water and oxygen barrier property of the front surface (surface away from the substrate) of the lower barrier layer.

Second, template layer 203

The template layer 203 is located between the first barrier layer 202 and the second barrier layer 211. The template layer 203 may be in direct contact or indirect contact with the first barrier layer 202. For the indirect contact scheme, for example, an inorganic oxide layer (for enhancing the protection effect against water and oxygen) is formed on the surface of the first barrier layer 202, and then the template layer 203 covers the inorganic oxide layer.

Referring to fig. 4, the template layer 203 may be provided in a grid-like structure. In other words, the template layer 203 has a plurality of unit cells 2031 (cavities/grooves/holes/channels), such as two, three, four, or even more. The unit cells 2031 of the template layer 203 may be made of a subtractive material to the complete film layer; alternatively, no film layer material is formed (e.g., printed) in areas where it is desired to form the cells 2031 by additive means. The cells 2031 can contain different materials to form a functional layer, such as a quantum dot layer 205, surrounded by the cells 2031. The quantum dot layer 205 may be formed by filling quantum dot material (e.g., solution) in the cells 2031 and then curing.

When the quantum dot film 200 has an appropriate size, the template layer 203 may be an integral film layer for the entire quantum dot film 200. Alternatively, when the quantum dot film 200 has another larger size and the template layer 203 may not be easily fabricated as a complete film, it may be formed by assembling a plurality of small-sized films.

The template layer 203 has a suitable thickness (the extension between the first barrier layer 202 to the second barrier layer 211) so as to accommodate other structural and functional layers of suitable thickness, as desired. Here, the thickness thereof is not particularly limited in the examples of the present application. In addition, when the template layer 203 is formed by combining a plurality of smaller-sized units, the thickness of each unit may be the same or different. For cells with different thicknesses, it can be used for some specific design requirements.

Alternatively, the template layer 203 may be fabricated using an opaque material. For example, the opaque material may be a metal or a non-metal material (e.g., a resin). The cell 2031-shaped frame is formed by coating the first barrier layer 202 with a solution, paste, or the like, and then performing a suitable process (e.g., a photolithography process such as exposure and development). Thus, the frame may effectively control the thickness, flatness, and limit the flow of ink within the cells 2031 for low viscosity printing ink within the cells 2031.

Third, quantum dot layer 205

Quantum dot layer 205 is the primary light emitting structure of quantum dot film 200, and quantum dots can emit light when stimulated by other light sources or energies. For example, typically quantum dot layer 205 is selected as a red-green hybrid quantum dot, and then a blue LED backlight is used as an excitation source to cause the red-green quantum dots to emit light. This is explained in the foregoing and is referred to again herein, with detailed reference to the foregoing. It should be noted that, in the related art, it is usually (but not necessarily) chosen to use a blue or blue-violet LED as a backlight to excite red and green quantum dots.

The red, green and blue quantum dots may be selected from various quantum dot materials known to the inventors as needed, and are not particularly limited. Further quantum dots may be fitted with a molding/curing material to make quantum dot layer 205. For example, the ink solvent with viscosity below 60CPS (viscosity) is formed by mixing 630nm red quantum dots and 520nm green quantum dots with acrylate photo-curing glue (or other materials suitable for curing), wherein the weight percentage of the quantum dots can be 10-40%, and the film thickness is 10-200 μm. In some alternative examples, the red quantum dots may be CdSe/CdS (cadmium selenide/cadmium sulfide) with a core-shell structure, and the light emitting wavelength is 620 nm; the green quantum dot is CdSe/CdS with a core-shell structure, and the light-emitting wavelength of the green quantum dot is 540 nm. The total weight percentage of the red quantum dots and the green quantum dots is 1%, and the photo-curing glue is acrylate UV curing glue with the viscosity of 50CPS (0.001Pa s ═ 1 CPS). The weight percent of light-converting material in the final quantum dot layer 205 ink was 15% and the final film thickness was 130 μm.

The quantum dot layer 205 may be bonded within the unit cells 2031 of the template layer 203 and in direct contact with the first barrier layer 202. Alternatively, the quantum dot layer 205 may be filled in the cells 2031 of the template layer 203 with an appropriate intermediate structure layer, and bonded in indirect contact with the first barrier layer 202 through the intermediate structure layer. The intermediate structural layer may be a structural layer (which may be one or more layers) having a single function; alternatively, the intermediate structural layer may be a combination of multiple (which may be two or three or more) structural layers having multiple functions.

Fourth and first improvement layer

The first improved layer may alternatively be referred to as an intermediate structural layer as previously mentioned in the section "third, quantum dot layer 205". Which may be used as a functional layer for improving the light emitting effect of the quantum dot film 200 to various degrees, and which is located within the cells 2031 of the template layer 203 as described above. The first improvement layer and the quantum dot layer 205 are combined and filled in the plurality of unit cells 2031 in a layer-wise stacked manner in the first preset Y direction.

For example, the first improvement layer may include a light conditioning layer 207, a light extraction layer 206, and a light guiding layer 204, which will be explained in detail in the following description. The first improvement layer has various optional configurations, and the implementer of the embodiments of the present application may select the configuration according to the requirements of the functionalization.

That is, the implementer may choose to set one or a combination of more of the light conditioning layer 207, the light extraction layer 206, and the light guiding layer 204 to constitute the first improved layer. As an example, the combination of the plurality of layers may be a combination of two of the light modulation layer 207 and the light extraction layer 206, or a combination of two of the light extraction layer 206 and the light guide layer 204, or a combination of three of the light modulation layer 207, the light extraction layer 206, and the light guide layer 204.

Since the first improvement layer is located within the cells 2031 of the template layer 203 in various alternative schemes, the relative positions of the respective functionalized structure layers and the quantum dot layer 205, and the respective relative positions of the light conditioning layer 207, the light extraction layer 206, and the light guiding layer 204 can be selected as desired. The following example is only given as a scheme, but not limited thereto.

For example, in one aspect, the first enhancement layer may alternatively be selected to be the light guiding layer 204. As far as the spatial position of the light guiding layer 204 is concerned, it may be arranged between the first blocking layer 202 and the quantum dot layer 205. I.e. the light guiding layer 204 is an intermediate structural layer located between the first barrier layer 202 and the quantum dot layer 205.

The light guide layer 204 can scatter light (e.g., blue light) into the quantum dot layer 205 to improve the uniformity of the emitted light of the excited light source in the quantum dot layer 205. That is, when blue light is used as both blue light in three primary colors and as excitation light for exciting red light quantum dots and green light quantum dots, the blue light is emitted so that the red light quantum dots and the green light quantum dots can be excited better (it should be noted that in the related art, it is usually (but not necessarily) chosen to use a blue light or blue-violet light LED as a backlight for exciting red and green light quantum dots). Therefore, in the scheme of excitation using blue light, the light guide layer 204 can scatter the blue light, so that the blue light enters the quantum dot layer 205 at different refraction angles to excite the quantum dots, and the quantum dots are all excited. Secondly, the light guiding layer 204 has positive significance for improving the light extraction rate of blue light on the surface of the first blocking layer 202, reducing the lateral reflection of the blue light in the first blocking layer 202, reducing the side light leakage and avoiding the influence on the picture quality.

The light guide layer 204 has a function of dispersing light, and thus, it may scatter light using a scattering material or particles. The principle of scattering light can be seen in fig. 5. In fig. 5, the left upper surface is rough so that light is scattered; and the upper surface of the right side is smooth, most of the light is reflected laterally, and therefore light leaks laterally. Therefore, scattering particles are arranged in the light guide layer 204, similarly to increasing the surface roughness, so that the light scattering changes the direction, and the side light leakage is avoided.

Further, the scattering material may be cured by a curing material to be formed into a film, based on the need for forming the film. For example, the scattering material is mixed with resin to prepare printing ink or form film by evaporation and sputtering. Wherein the scattering material may be any one or combination of titanium oxide particles, tantalum oxide particles, niobium oxide particles, zirconium oxide particles, aluminum oxide particles, tungsten oxide particles, antimony oxide particles, vanadium oxide particles, molybdenum oxide particles, silicon oxide particles, chromium oxide particles, iron oxide particles, copper oxide particles, lead oxide particles, yttrium oxide particles, manganese oxide particles, tin oxide particles, zinc oxide particles, lead sulfide particles, zinc sulfide particles, cadmium sulfide particles, zinc telluride particles, and cadmium selenide particles. Illustratively, the combination scheme of the scattering material may be a combination of both titanium oxide particles and tantalum oxide particles; or the combination of tungsten oxide particles, vanadium oxide particles and molybdenum oxide particles; or a combination of four of lead oxide particles, yttrium oxide particles, manganese oxide particles, tin oxide particles, and the like.

In another approach, the first improvement layer may alternatively include a light conditioning layer 207. In the placement direction shown in fig. 2, the light modulation layer 207 may be optionally disposed over the quantum dot layer 205. The light adjusting layer 207 and the quantum dot layer 205 may be fitted in direct contact therebetween, or other layers (such as a light extraction layer 206 mentioned later) may be provided therebetween. In addition, in the case where the light adjustment layer 207 and the light guide layer 204 coexist, both the light adjustment layer 207 and the light guide layer 204 may be located on both sides of the quantum dot layer 205 in the first preset Y direction, respectively.

The light adjusting layer 207 has a function of filtering light, and may be replaced with a filter selected appropriately. The chromaticity coordinates of the three-color light source can be adjusted and the light intensity can be reduced by the light adjusting layer 207. Thus, the light modulation layer 207 can also be used to repair the quantum dot film 200 in which defects occur (and this repair can be done during the fabrication of the quantum dot film 200). For example, a spectroscopic instrument is used to detect the color coordinates and brightness parameter values of white light (tricolor blend) in the region. If the color coordinates of a region are shifted due to weak red light, a light adjusting material is formed in the region according to the magnitude of the offset value, and correction is performed. Or a region where the light intensity is too high is formed with a light adjusting material for correction.

The light adjusting layer 207 may be made of various suitable materials, and in view of film formation, an acrylic light curing adhesive or a thermosetting adhesive having a viscosity of 30 to 50CPS (32 CPS, 35CPS, 44CPS, 47CPS, etc.) may be mixed with a filter material having a particle size of about 20 to 100nm (22 nm, 28nm, 35nm, 39nm, 41nm, 46nm, 52nm, 68nm, 73nm, 88nm, 95nm, etc.). The light filtering material is uniformly distributed in the curing glue to improve the function of the light adjusting layer 207. Thus, the light conditioning layer 207 may be made of a material including a light conditioning carrier, and a filter material dispersed and cured in the light conditioning carrier. The filter material is uniformly distributed (may be normally distributed) within the light-modulating support to provide good light-modulating effect.

The light adjusting carrier may be the light curing adhesive or the heat curing adhesive.

Wherein the filter material may be formed by a pigment dispersed in the ink. And, it may include one or more of red filter ink, green filter ink, blue filter ink, and black filter ink. For example, many may be red filter ink, green filter ink; alternatively, the plurality may be three of red filter ink, green filter ink, and blue filter ink; alternatively, more may be three of green filter ink, blue filter ink, and black filter ink; or, the red filter ink, the green filter ink, the blue filter ink and the black filter ink. The chromaticity coordinates of the three-color light source can be adjusted by the red filter ink, the green filter ink and the blue filter ink. The black filter ink may reduce the luminance of light emitted.

The filtering wavelength range of the red filtering ink can be 625-635 nm, the filtering wavelength range of the green filtering ink can be 515-525 nm, and the filtering wavelength range of the blue filtering ink can be 435-445 nm.

In addition, the light adjusting layer 207 may be formed of a material having a light blocking property. The light blocking material may be one or more of organic pigments such as phthalocyanine and DPP, fluorescent materials, and quantum dot materials.

Based on the above, the proportion of the pigment in the ink is determined to be 10%, 7% and 3% according to the analysis of the test chromaticity coordinate and the brightness data, so that the requirement of correcting deviation can be met. For example, if a detector is used for detection, if the white light in a certain area or some areas has weak color coordinates and weak red light of the brightness parameter value, red filter ink with proper proportion of the filter material in the ink is selected to be printed in the area, and therefore redundant green light and blue light in the area are filtered out, and the color coordinates are corrected back. Or the light intensity of a certain area is too high, black light-absorbing ink with proper proportion of pigment in the ink is selected to be printed in the area, and therefore the redundant light intensity is absorbed to be consistent with the light intensity of other areas.

In yet another aspect, the first enhancement layer may alternatively include the light extraction layer 206. In the orientation of placement shown in fig. 2, light extraction layer 206 is positioned above quantum dot layer 205, which may generally mate in direct contact with quantum dot layer 205. For the solution where the light extraction layer 206 and the light modulation layer 207 are present at the same time, the light extraction layer 206 is located between the light modulation layer 207 and the quantum dot layer 205. Both surfaces of the light extraction layer 206 in the thickness direction (the first predetermined direction Y) may be in contact with the light modulation layer 207 and the quantum dot layer 205, respectively, and the light modulation layer 207 is in contact with the second barrier layer 211. Thus, in an alternative example, the quantum dot layer 205 and the first amelioration layer, which are located within the lattice of the template layer 203, together constitute a layered structural distribution as follows: in the first predetermined direction Y, a light guiding layer 204, a quantum dot layer 205, a light extraction layer 206 and a light adjusting layer 207 are sequentially distributed.

For the light extraction layer 206, it can improve light extraction efficiency and increase light intensity. It can be an ink made of a mixture of a scattering material (such as scattering particles) and a curing glue. Optionally, the light extraction layer 206 is made by mixing a resin with viscosity less than 60CPS and scatterer particle material.

The curable resin can be a light-curable resin or a heat-curable resin selected from one of epoxy resin, acrylic resin, polyurethane, polyester and isocyanate or a combination of at least two of the epoxy resin, the acrylic resin, the polyurethane, the polyester and the isocyanate.

The scatterer material can be selected from inorganic substances, organic substances or organic-inorganic hybrid substances.

The inorganic scatterer can be one or a combination of at least two selected from magnesium fluoride, barium sulfate, silicon oxide, magnesium oxide, zirconium oxide, zinc sulfide, titanium oxide, aluminum oxide, zinc oxide, silicon oxide and silicon nitride.

The organic matter scatterers may be selected from polyolefins such as polystyrene, polyethylene, etc.; polyesters such as polycarbonate, polymethyl methacrylate and the like; polyamides such as nylon 66, polyimides such as ether anhydride type polyimides, and the like, or a combination of at least two thereof.

The organic-inorganic hybrid scatterer can be one or a combination of at least two of inorganic particles coated with organic matters such as polystyrene/silicon dioxide composite microspheres, polymethyl methacrylate/silicon dioxide composite microspheres and the like, and organic colloidal particles coated with inorganic matters such as titanium dioxide/polystyrene composite microspheres and the like.

Fifth and second improving layers

The quantum dot film 200 may optionally include a second improvement layer, as desired. In contrast to the layered structure arrangement of the first improvement layer in the first predetermined direction, the second improvement layer comprises one or more structural layers of different functions arranged in a second predetermined direction X (e.g. horizontal direction). The second improvement layer may be selected differently depending on its function. In an example, the second improving layer includes the drying layer 208, or the second improving layer includes the light absorbing layer 209, or the second improving layer includes both the drying layer 208 and the light absorbing layer 209. The details of the drying layer 208 and the light absorbing layer 209 are disclosed later and are not described herein.

The second modified layer may also fill in the cells 2031 of the template layer 203, and thus, is also located between the first barrier layer 202 and the second barrier layer 211. In order to more clearly express the relative positional relationship of the first improving layer, the second improving layer, the drying layer 208, and the light absorbing layer 209, the following description is made.

Referring to fig. 3, the template layer 203 includes a first filling area 302 and a second filling area 303, and the first filling area 302 is surrounded by the second filling area 303 in the second predetermined direction X. The second fill region 303 has an outer side adjacent to the inner side of the first fill region 302, distal to the first fill region 302.

Based on this, the first improvement layer and the quantum dot layer 205 are combined to fill the plurality of cells 2031 of the first filling region 302, and the second improvement layer fills the plurality of cells 2031 of the second filling region 303. For the case where the second improving layer has both the drying layer 208 and the light absorbing layer 209, the drying layer 208 is filled inside the second filling region 303, and the light absorbing layer 209 is filled outside the second filling region 303. Alternatively, the drying layer 208 is filled outside the second filling region 303, and the light absorbing layer 209 is filled inside the second filling region 303. That is, for the desiccating layer 208 and the light absorbing layer 209, both are located within different cells 2031, respectively, of the second fill area 303 of the template layer 203.

As for the thicknesses of the drying layer 208 and the light absorbing layer 209, both may be the same as the depth of the unit cells 2031 in the first preset direction. And therefore, both surfaces of the first barrier layer 202 and the second barrier layer 211 in the first predetermined direction may be in contact with each other. Alternatively, both layers are in contact with inorganic layers formed in the first barrier layer 202 and the second barrier layer 211, respectively.

The second improvement layer can be fabricated in an anhydrous, oxygen-free environment and can function as an auxiliary functional layer.

Wherein the desiccant in the desiccant layer 208 is effective to prevent lateral permeation of water and oxygen into the interior. The drying agent may be a hygroscopic substance selected from one or more of alumina, calcium oxide, calcium chloride, magnesium sulfate, barium oxide, phosphorus pentoxide, potassium hydroxide, sodium hydroxide, potassium bromide, calcium bromide, zinc chloride, calcium sulfate, magnesium oxide, a water-absorbent resin and a molecular sieve, and the hygroscopic substance is mixed with a curable resin or a non-curable perfluoroalkane solvent to form a material of the dried layer 208, and thus it may be referred to as a printing ink.

The light absorbing layer 209 can absorb light propagating in the upper and lower film layers (the first barrier layer 202 and the second barrier layer 211) in the transverse direction, so as to avoid light leakage caused by the side surface, thereby ensuring display quality. I.e., light absorbing layer 209, addresses edge light leakage. Because upper and lower rete can all go out some with the refraction of light, and the light of another part can be along upper and lower rete inside reflection consumption or transmit the edge of upper and lower rete and then send faint light constantly to lead to display screen edge luminance to be on the high side in narrow frame display screen. And the light absorbing layer 209 can absorb a part of the light to reduce the side edge light leakage. The light absorbing material can be one or more selected from black dye or carbon nanotube material, and is mixed with the curing resin to form printing ink.

Further, the second improving layer may include an adhesive layer 210. The adhesive layer 210 may cover, stabilize, and may also thereby bond the second barrier layer 211 to the desiccant layer 208 and the light absorbent layer 209 of the first and second modified layers. The material of the adhesive layer 210 may be one selected from epoxy resin, acrylic resin, polyurethane, polyester, and isocyanate, or a light-curable resin or a thermosetting resin (resin-based adhesive) of a combination of at least two of them.

The curable resin covers the whole surface of the cell 2031-shaped frame (template layer 203) by coating, spraying or the like, and the properties of the adhesive layer, such as adhesive strength, water and oxygen barrier, high transmittance and the like, can be better ensured because no (doped) quantum dots and other substances overflow or spill out.

Sixth and second barrier layers 211

Second barrier layer 211 may generally have the same or similar options as first barrier layer 202, e.g., the same materials and processes of fabrication. Of course, both may not necessarily be fabricated in a uniform manner, depending on the needs. In the present example, both are made of the same material and in the same process, as described above.

In addition, in fabricating the quantum dot film 200, the first barrier film may be formed on the substrate for convenience of implementation, and thus, the substrate may provide advantageous surface flatness and structural support. The substrate may be selected to be a glass substrate, for example. After the fabrication of each structure or functional layer is completed, the glass substrate is peeled off to obtain the quantum dot film 200.

Further, in order to facilitate the implementation of the solution in the present application example more easily by those skilled in the art, a method for manufacturing the quantum dot film 200 is provided in the example. The manufacturing method comprises the following steps:

s1, providing a substrate provided with a first barrier layer 202;

s2, forming a template layer 203 having a plurality of unit cells 2031 on the surface of the first barrier layer 202, wherein the template layer 203 includes a first filling area 302 and a second filling area 303, and the first filling area 302 is surrounded by the second filling area 303 in the second predetermined direction X;

s3, disposing the quantum dot layer 205 on the first portion of the first filling region 302 by wet method;

s4, disposing the light adjusting layer 207 on the second portion of the first filling region 302 by wet method;

s5, disposing a second barrier layer 211 on a side of the template layer 203 away from the first barrier layer 202;

wherein the quantum dot layer 205 and the light modulation layer 207 are layered in a first predetermined direction.

In combination with the structure of the quantum dot film 200, the process steps can be adjusted accordingly for the scheme with the light guide layer 204, the light extraction layer 206, the drying layer 208, the light absorption layer 209 and the adhesive layer 210.

Each step is described in detail below.

S1, providing the substrate provided with the first barrier layer 202.

The substrate may be selected to be a glass substrate that is easily bonded to the first barrier layer 202 and can be peeled off under appropriate conditions. For example, a PI solution is applied or sprayed on a clean glass substrate to form a film, and a silicon oxide layer, a silicon nitride layer, or an aluminum oxide layer is formed on the surface by sputtering, vapor deposition, or coating to improve the water and oxygen barrier properties of the front surface of the lower barrier layer. Thereby, the substrate, the first barrier layer 202, and the inorganic oxide film form a three-layer structure.

S2, a template layer 203 having a plurality of unit cells 2031 is formed on the surface of the first barrier layer 202, the template layer 203 includes a first filling area 302 and a second filling area 303, and the first filling area 302 is surrounded by the second filling area 303 in the second predetermined direction X.

The template layer 203 may be made of a non-light-transmissive material such as a metal, nitride, oxide, or fluoride. Conveniently, the raw materials for their preparation are used in the form of solutions or slurries/inks, which are applied by doctor blading to form films. The grid is made by printing, photoetching, sputtering, printing and the like according to the requirements such as height, shape, size and the like.

Optionally, the following steps may be further included between steps S2 and S3:

the light guide layer 204 is disposed between the plurality of unit cells 2031 between the quantum dot layer 205 and the first barrier layer 202. A light guiding layer 204 is wet laid (preferably printed) within the grid (cells 2031). The light guide layer 204 can improve the blue light extraction rate of the surface of the PI film, reduce the lateral reflection of blue light in the PI film, reduce the side light leakage and avoid influencing the image quality. And, blue light may enter quantum dot layer 205 in a scattered form via light guide layer 204. The light guide layer 204 can increase the roughness of the surface of the substrate to enhance the scattering and increase the area of the emergent interface of light, thereby improving the emergent probability of light and reducing the transverse refraction of the light source in the film layer.

S3, the quantum dot layer 205 is disposed on the first portion of the first filling region 302 by a wet process.

The first portion is above the light guiding layer 204 of the unit cell of the template layer 203 defined by the first filling region 302.

The quantum dots mainly refer to R/G quantum dots, and after the R/G quantum dots and photo-curable or thermosetting resin are mixed in proportion to print ink (with the viscosity within 60 CPS), wet film forming and curing are carried out. The wet process may be a printing process, a spin coating process, a coating process, or the like, and printing is preferable.

Optionally, the following steps are further included between steps S3 and S4:

the light extraction layer 206 is provided between the plurality of unit cells 2031 between the light modulation layer 207 and the quantum dot layer 205. In the example, the light extraction layer 206 is formed by mixing nano-scale powder such as titanium oxide, aluminum oxide, etc. and a photocurable or thermosetting resin in proportion to an ink (viscosity within 60 CPS), performing wet film formation and curing, to improve the effect of light scattering to the outside. The wet process may be a printing process, a spin coating process, a coating process, or the like, and printing is preferable.

Further, based on the need, inspection may be required to correct for defects or flaws. Therefore, the substrate/substrate is placed on the blue backlight panel, and the chromaticity coordinate and the light intensity parameter of the film layer which emits white light are detected by the spectral instrument testing equipment. Based on the detection result, if there is a problem such as color cast, it can be repaired by the light adjustment layer 207.

S4, the light adjustment layer 207 is disposed on the second portion of the first filling region 302 by a wet process.

Wherein the first portion is referred to as being above the light extraction layer 206 of the cells of the template layer 203 defined by the first filled region 302.

Since the quantum dot layer 205 and the light modulation layer 207 are arranged in a stack, they are located in the same corresponding unit cell. Each cell within the first fill area 302 has the same fill structure. And the fill structure includes a quantum dot layer 205 and a light modulating layer 207.

In the configuration as in fig. 2, the first fill area 302 illustrates three cells; in the configuration of fig. 3, the first fill area 302 shows 13 columns of cells, with 8 ternary cells per column.

It can be determined from the above test results whether blue light or red light or green light is present in the region divided by the quantum dot film 200 and the chromaticity coordinates and brightness are deviated due to the excessive intensity of the light source somewhere. And when the problem that the chromaticity coordinate and the brightness are deviated due to the over-strong light source occurs, the color coordinate deviation of the area is corrected by manufacturing the light blocking layer capable of absorbing a part of blue light or red light or green light, so that the picture quality is ensured. Wherein the light blocking layer is an embodiment of a functional layer of the light regulating layer 207.

Optionally, after the above repairing, in order to protect the quantum dot layer 205, the following steps are further included between steps S4 and S5: the drying layer 208 and the light absorbing layer 209 are disposed inside and outside the second filling region 303 using a wet process. The drying layer 208 may be filled inside the second filling region 303, and the light absorbing layer 209 may be filled outside the second filling region 303. An exemplary process prints a circle of light-curable or heat-curable light-absorbing layer 209 (e.g., using carbon nanotubes) with a light-blocking function in the outermost grid of the membrane layer, and a layer of light-curable or heat-curable or non-curable desiccant in the inner grid of the light-absorbing layer 209.

Therefore, the light conversion structure (such as red, green and blue quantum dots) of the quantum dot film 200 and the light emitting characteristics thereof are appropriately protected or repaired, so that good light emitting effects (such as uniform light intensity distribution, reduced or even avoided light leakage, suppressed color cast, etc.), long service life, etc. can be realized. In the first filling region 302, a light emitting layer structure including a light guiding layer 204, a quantum dot layer 205, a light extraction layer 206, and a light adjusting layer 207 as shown in fig. 3 may be formed in the unit cells 2031 of the template layer 203.

Further, in order to facilitate the subsequent bonding of the second barrier layer 211, a curable adhesive layer may be disposed by printing, spin coating, or the like.

S5, disposing a second barrier layer 211 on a side of the template layer 203 away from the first barrier layer 202.

The second barrier layer 211 is a PI film that is previously manufactured using the same material and process as the first barrier layer, and is prepared by performing a pretreatment (e.g., cleaning), and after the treatment, attaching the PI film to the surface of the adhesive layer, and then curing the PI film.

After the second barrier layer 211 is attached, the manufactured film may be separated from the glass substrate using laser, so that the quantum dot film 200 may be obtained.

By the above-described structural design and process selection to obtain the quantum dot film 200, a product of desirable quality can be obtained, and at least some of the following advantages are exhibited.

1. The quantum dot film prints the quantum dot layer in the cell frame, so that the thickness uniformity of the quantum dot layer is ensured, and meanwhile, the chromaticity coordinate is indirectly controlled without large deviation.

2. The chromaticity coordinate and the brightness of the quantum dot light conversion film can be effectively adjusted by printing and manufacturing the light adjusting layer.

3. The problem of invalid edges is not easy to occur in the auxiliary functional layer, so that the quantum dot light conversion film has a long service life.

The quantum dot film 200 can be used for manufacturing products such as backlight modules, displays and the like. The product can also have structures such as a power module and a light guide plate, and can be implemented by those skilled in the art according to requirements.

A backlight module, a quantum dot film 200 and a method for manufacturing the same according to the present application are further described in detail with reference to the following embodiments.

Example 1

The preparation method of the quantum dot film comprises the following steps:

step one, manufacturing a lower barrier layer on a clean glass substrate

Firstly, coating a polyimide film (PI film) with the thickness of 125 mu m on a glass substrate, and then depositing a layer of alumina with the thickness of 400nm on the surface of the PI film to finally form a lower barrier film;

step two, manufacturing a template layer

And spraying a black resin solution on the surface of the lower barrier film by using a coating device to form a film layer with the thickness of 0.19mm, and forming a unit cell with the grid line width of 0.06mm, the single grid frame length and width of 3mm x 1mm and the height of 0.19mm on the surface of the lower barrier film layer by using photoetching processes such as exposure, development and the like for manufacturing a frame of the first filling area. Further, forming a single grid frame with the length and width of 1mm x 1mm and the height of 0.19mm for manufacturing a frame of the second filling area;

step three, manufacturing the light guide layer

Uniformly mixing titanium dioxide and aluminum oxide with the particle size of 30-50 nanometers and acrylic resin photocuring glue with the viscosity of 40CPS, wherein the weight percentage of the titanium dioxide is 8% and the weight percentage of the aluminum oxide is 4%, printing a light guide material in a metal grid of a first filling area by using a printing mode, and carrying out uv curing;

step four, manufacturing quantum dot layer

And printing the quantum dot ink on the surface of the light guide layer in the metal grid of the first filling area, and curing. The quantum dot ink comprises quantum dots and a light-cured resin adhesive, wherein the quantum dots are red quantum dots and green quantum dots which are uniformly mixed, the red quantum dots are CdSe/CdS with a core-shell structure, the light-emitting wavelength of the red quantum dots is 620nm, the green quantum dots are CdSe/CdS with a core-shell structure, the light-emitting wavelength of the green quantum dots is 540nm, the total weight percentage of the red quantum dots and the green quantum dots is 1%, and the light-cured adhesive is an acrylate UV curing adhesive with the viscosity of 50 CPS. The weight percentage of the quantum dots in the final quantum dot layer ink is 15% and the final film forming thickness is 130 μm;

step five, manufacturing a light extraction layer

Titanium oxide particles with the average particle size of 350nm and acrylic resin photocuring glue with the viscosity of 40CPS are uniformly mixed, wherein the weight percentage of titanium dioxide is 10%, the mass percentage of a dispersing agent is 1%, and the balance is resin. Printing the light guide material in the grid frame of the first filling area by using a printing mode and carrying out uv curing;

step six, testing the uniformity of the film layer

Placing the quantum dot film on a blue LED lamp with the wavelength of 450nm as a backlight source, detecting the color coordinate and the brightness parameter value of white light on the surface of the film by using a PR670 spectral instrument, and setting the color coordinate of the manufactured quantum dot light conversion touch white light as X0.2950; y0.3021, luminance is 400, and from the test results, it is found that the regions with large deviation of chromaticity coordinate values are 1, 2, 3, 7, 9, and the regions with large deviation of luminance are 5, 6, as follows:

seventhly, manufacturing a light adjusting layer

Acrylic resin photo-curing glue with the viscosity of 30CPS is mixed with pigment with the particle size of about 20nm and is uniformly distributed. The light regulating layer material comprises red filter ink, green filter ink and blue filter ink which are made of organic pigments such as phthalocyanines and DPP (dipeptidyl peptidase), and black filter ink which is made of carbon nano tubes and reduces the luminous intensity. Wherein the filtering wavelength range of the red filtering ink is 625 nm-635 nm, the filtering wavelength range of the green filtering ink is 515 nm-525 nm, and the filtering wavelength range of the blue filtering ink is 435 nm-445 nm. The proportion of the pigment in the ink is determined to be 5 percent and 3 percent according to the analysis of the test chromaticity coordinates, and the proportion of the black light absorption ink is determined to be 10 percent, 7 percent and 3 percent according to the analysis of the brightness data, so that the requirement of correcting deviation can be met.

And (3) chromaticity coordinate adjustment: printing red filtering ink areas with the specific gravity of 3% as 2, 4, 7 and 9; printing green light filtering ink areas with the specific gravity of 3% as 2, 4 and 9; printing red filtering ink areas with the specific gravity of 7% as 1 and 3; the green filter ink areas with a 7% specific gravity were printed at 3, 7 and each layer was 110nm thick.

And (3) brightness adjustment: printing a black light-absorbing ink area with the specific gravity of 7% as 6; the area of black light-absorbing ink with a printing specific gravity of 10% is 5, and the film thickness is 70 nm. And after the adjusting layer is printed, continuously detecting the color coordinates and the brightness of the white light on the surface of the film layer by using a spectrometer as follows.

Step eight, manufacturing an auxiliary functional layer

The structure is a non-light emitting area with the width of 2mm (width in the horizontal direction) formed by a drying layer/a light absorbing layer/an adhesive layer.

Firstly, printing a drying layer material with the thickness of 0.19mm (the thickness in the vertical direction) in the grid frame at the inner side of the second filling area, wherein the drying layer material mainly comprises acrylic resin photocureable gum with the viscosity of 40CPS and nano calcium particles with the particle size of 180 nm-300 nm, and the weight percentage of the nano calcium is about 45%.

And printing a light absorption material with a film thickness of 0.19mm (the thickness in the vertical direction) on the outer side of the second filling area, wherein the light absorption material mainly comprises propionic resin photocuring glue with viscosity of 40CPS and carbon nano tubes with the particle size of 100 nm-200 nm, the weight percentage of the carbon nano tubes is 38%, and the total percentage of the dispersing agent is 0.8%.

And finally, covering the whole surface of the latticed frame with an acrylic resin photo-curing adhesive with the viscosity of 45CPS by using a slit coating device to finally form an adhesive layer, wherein the thickness of the adhesive layer on the upper surface is about 6 mu m.

Ninth, manufacturing an upper barrier film

And adhering the upper barrier film to the surface of the adhesive layer by using a film adhering device, carrying out UV curing, and peeling the quantum dot film from the glass substrate by using a laser device to complete the manufacturing of the quantum dot film.

Example 2

The difference between the quantum dot film fabrication provided in this example and example 1 is that:

placing the quantum dot film on a blue LED lamp with the wavelength of 450nm as a backlight source, detecting the color coordinate and the brightness parameter value of white light on the surface of the film layer by using a PR670 spectral instrument, and setting the color coordinate of the quantum dot light conversion touch white light manufactured at this time as X0.2950; y0.3021, luminance is 400, and from the test results, it is found that the areas with large deviation of chromaticity coordinate values are 1, 2, 4, 5, 9, and the areas with large deviation of luminance are 4, 5, 6, as follows:

step seven, ink-jet printing light adjusting layer

Acrylic resin photo-curing glue with the viscosity of 30CPS and fluorescent materials with the particle size of about 20nm are mixed and normally distributed.

The light adjusting layer mainly comprises red filter ink, green filter ink and blue filter ink which are made of fluorescent materials, and black filter ink which is made of carbon nano tubes and reduces the luminous intensity. Wherein the filtering wavelength range of the red filtering ink is 625 nm-635 nm, the filtering wavelength range of the green filtering ink is 515 nm-525 nm, and the filtering wavelength range of the blue filtering ink is 435 nm-445 nm.

The proportion of the fluorescent material in the ink is determined to be 5% and 3% according to the analysis of the test chromaticity coordinate, and the proportion of the black light absorption ink is determined to be 10%, 7% and 3% according to the analysis of the brightness data, so that the requirement of correcting deviation can be met.

And (3) chromaticity coordinate adjustment: printing red filtering ink areas with the specific gravity of 3% as 4 and 9; printing green light filtering ink areas with the specific gravity of 3% as 1 and 2; the area of blue filter ink with a 3% specific gravity was printed as 5 and each layer was 110nm thick.

And (3) brightness adjustment: the black light absorption ink areas with the printing specific gravity of 3%, 7% and 10% are respectively 4, 6 and 5, and the film thickness is 70 nm. And after the adjustment layer is printed, continuously detecting the color coordinates and the brightness of the white light on the surface of the film layer by using a spectrometer as follows:

step eight, auxiliary functional layer

The drying layer material with the thickness of the printing film layer being 0.19mm in the manufacturing process mainly comprises acrylic resin photo-curing glue with the viscosity of 40CPS and nano calcium particles with the particle size of 180 nm-300 nm, aluminum and barium oxide, wherein the weight percentage of the nano calcium is 20%, the weight percentage of the aluminum is 15%, the weight percentage of the barium oxide is 10%, and the balance is the photo-curing resin.

Example 3

placing the quantum dot film on a blue LED lamp with the wavelength of 450nm as a backlight source, detecting the color coordinate and the brightness parameter value of white light on the surface of the film layer by using a PR670 spectral instrument, and setting the color coordinate of the quantum dot light conversion touch white light manufactured at this time as X0.2950; y0.3021, luminance is 400, and from the test results, it is found that the regions with large deviations in chromaticity coordinate values are 1, 2, 3, 4, 7, 9, and the regions with large deviations in luminance are 4, 5, 6, as follows:

step seven, ink-jet printing light adjusting layer

The acrylic resin photo-curing glue with the viscosity of 30CPS is mixed with the quantum dots with the particle size of about 20 nm. The light adjusting layer mainly comprises red filtering ink and green filtering ink which are made of quantum dot materials, and black filtering ink which is made of carbon nano tubes and reduces luminous intensity.

Wherein the filtering wavelength range of the red filtering ink is 625 nm-635 nm, and the filtering wavelength range of the green filtering ink is 515 nm-525 nm. The proportion of the fluorescent material in the ink is determined to be 5% and 3% according to the analysis of the test chromaticity coordinate, and the proportion of the black light absorption ink is determined to be 10%, 7% and 3% according to the analysis of the brightness data, so that the requirement of correcting deviation can be met.

And (3) chromaticity coordinate adjustment: printing red filtering ink areas with the specific gravity of 3% as 1, 2 and 9; the green filter ink areas with a 3% specific gravity were printed as 1, 2, 3, 7, 9 and each layer was 60nm thick.

step eight, auxiliary functional layer

The printing film layer thickness in the preparation is 0.19mm, the drying layer material mainly comprises a perfluoroalkyl non-curing solvent with the viscosity of 40CPS, nano calcium particles with the particle size of 180 nm-300 nm and molecular sieve particles with the particle size of 60 nm-100 nm, wherein the weight percentage of nano calcium is 25 percent, the weight percentage of molecular sieve is 20 percent, and the rest is the solvent.

Comparative example 1

The quantum dot film of the present comparative example includes a lower barrier film, a quantum dot layer, and an upper barrier film. The manufacturing method comprises the steps of coating the quantum dot ink on the lower barrier film by using a blade coating device to form a quantum dot layer with the thickness of 100 microns, attaching the upper barrier film to the upper surface of the quantum dot layer by using a roller, carrying out uv curing, and finally cutting to finish the quantum dot film manufacturing.

The backlight module is prepared according to the quantum dot films provided in the embodiments 1 to 3, and the luminous efficiency before and after aging of the quantum dot film in each embodiment is tested.

The quantum dot film after aging is obtained after aging for 1000 hours under the conditions of high temperature (65 ℃) and high humidity (95%). The corresponding method for detecting the luminous efficiency of the quantum dot film comprises the steps of using a blue LED lamp with the wavelength of 450nm as a backlight source, using an integrating sphere to respectively test a blue backlight spectrum and a spectrum penetrating through the quantum dot film, and calculating the luminous efficiency by using the integral area of a spectrogram.

The luminous efficiency is (red quantum dot absorption peak area + green quantum dot absorption peak area)/(blue backlight area-blue peak area unabsorbed through the quantum dot film) x 100%, and finally, the luminous efficiency is normalized to obtain the relative luminous efficiency in table 1, the relative luminous efficiency of the comparative example is determined to be 100%, other relative luminous efficiencies correspond to the same proportion, and the size of the quantum dot film edge invalid edge is determined under a microscope.

TABLE 1

As can be seen from the data in table 1, the quantum dot films of example 1 and example 2 have smaller changes in luminous efficiency after aging and no dead edge, compared to comparative example 1, indicating that the quantum dot films obtained in the examples of the present application have longer lifetimes. Compared with the examples 1 and 2, the drying agent in the example 3 adopts the non-curing solvent, so that gaps are easy to appear between the drying agent and the bonding layer, external water and oxygen are easy to permeate into the light conversion region after the quantum dot film is aged, a narrower invalid edge appears in the example 3, and the width of the invalid edge is still far smaller than that of the comparative example 1; in embodiments 1 and 2, due to the adoption of the epoxy cured resin mixed water and oxygen absorbing material, the drying agent area and the bonding layer are tightly connected after the quantum dot film is aged, no gap is generated, the difficulty of external water and oxygen permeating into the quantum dot film is increased, and no invalid edge is generated after the test is finished.

While particular embodiments of the present application have been illustrated and described, it would be appreciated that many other changes and modifications can be made without departing from the spirit and scope of the application. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this application.

Claims

1. The utility model provides a quantum dot membrane, quantum dot membrane includes presents first barrier layer, quantum dot layer and the second barrier layer of stratiform overall arrangement in first preset orientation, its characterized in that, quantum dot membrane still includes:

a template layer having a plurality of cells and disposed between the first barrier layer and the second barrier layer;

a first enhancement layer comprising a light conditioning layer;

the first improvement layer and the quantum dot layer are combined and filled in the plurality of unit cells in a layered and superposed mode in a first preset direction;

the quantum dot film comprises a second improvement layer, and the second improvement layer comprises a drying layer and a light absorption layer which are arranged in a second preset direction;

the template layer comprises a first filling area and a second filling area, and the first filling area is surrounded by the second filling area in the second preset direction;

the first improvement layer and the quantum dot layer are combined and filled in the plurality of unit cells of the first filling area, and the second improvement layer is filled in the plurality of unit cells of the second filling area;

the second filled region has an outer side adjacent to the inner side of the first filled region, distal from the first filled region;

the drying layer is filled on the inner side of the second filling area, and the light absorption layer is filled on the outer side of the second filling area.

2. The quantum dot film of claim 1, wherein the first improved layer further comprises a light extraction layer, and the light extraction layer is located between the light modulation layer and the quantum dot layer.

3. The quantum dot film of claim 1, wherein the first improvement layer further comprises a light guiding layer, and the light adjusting layer and the light guiding layer are respectively located on two sides of the quantum dot layer in the first predetermined direction.

4. The quantum dot film of claim 1, wherein the material of the light adjusting layer comprises a light adjusting carrier, and a filter material dispersed and cured in the light adjusting carrier, wherein the filter material is uniformly distributed in the light adjusting carrier.

5. The quantum dot film of claim 4, wherein the light modulation carrier comprises a light-curable glue or a heat-curable glue.

6. The quantum dot film of claim 4 or 5, wherein the filter material comprises one or more of a red filter ink, a green filter ink, a blue filter ink, and a black filter ink.

7. A manufacturing method of a quantum dot film is characterized by comprising the following steps:

s1, providing a substrate provided with a first barrier layer;

s5, arranging a second barrier layer on the side, far away from the first barrier layer, of the template layer;

wherein the quantum dot layer and the light adjusting layer are layered in a first preset direction;

the steps between S4 and S5 further include the following steps: arranging a drying layer and a light absorption layer on the inner side and the outer side of the second filling area by adopting a wet method; wherein the drying layer is filled in the inner side of the second filling region, and the light absorbing layer is filled in the outer side of the second filling region.

8. The method for manufacturing the quantum dot film according to claim 7, wherein the steps between S2 and S3 further comprise the steps of:

disposing a light guiding layer between the plurality of unit cells between the quantum dot layer and the first blocking layer.

9. The method for manufacturing the quantum dot film according to claim 7, wherein the steps between S3 and S4 further comprise the steps of:

a light extraction layer is disposed between the plurality of unit cells between the light adjusting layer and the quantum dot layer.

10. A backlight module, characterized in that the backlight module comprises the quantum dot film of any one of claims 1 to 6 or the quantum dot film manufactured by the manufacturing method of the quantum dot film of any one of claims 7 to 9.