Backlight module and display device

Abstract

The invention relates to the technical field of backlight modules, and discloses a backlight module and a display device. The optical component containing the red fluorescent powder is arranged in the light emitting direction of the blue light wafer of the backlight module, and the red shift phenomenon of color points of the backlight module is actively caused; meanwhile, quantum dots of a red light excitation wave band are greatly reduced or completely canceled in the quantum film in the light emitting direction of the optical component, and the quantum dot proportion of a green light excitation wave band is increased, so that the color dots are corrected, and the red shift is counteracted; meanwhile, due to the fact that quantum dots of the red light excitation wave band in the quantum film are greatly reduced, the stability of the quantum film is improved, the LED lamp panel can be driven to higher current, the LED light-emitting efficiency is improved, and the overall brightness of the backlight module is improved; and moreover, the color points can be adjusted by adjusting the proportion of the red wave band fluorescent powder, so that different liquid crystal panels can be matched, the composition of the quantum film can be kept unchanged, and the backlight module is more flexible and universal in actual production.

Description

Technical Field

[0001] The present application relates to the technical field of backlight modules, and in particular to a backlight module and a display device. Background Art

[0002] The LCD panel itself does not emit light and relies on the uniform surface light source provided by the backlight module to display images. The light source device of the backlight module, the light emitting diode (LED), uses a blue light chip to excite yellow phosphor to form white light. The blue light portion of its spectral distribution is relatively pure, and there are no obvious peaks in the green and red light portions. The saturation of green and red in the imaging spectrum is relatively low, resulting in color distortion.

[0003] In recent years, quantum dot materials have been widely used in liquid crystal display products in the form of optical films. Quantum dots are inorganic crystal particles with a particle size of nanometers. The most commonly used quantum dots are CdSe (cadmium selenide). Under the stimulation of external energy, electrons undergo transitions to form electron-hole pairs, and electron-hole recombination releases photons. Due to the confinement effect of quantum dot materials, their emission spectrum is very narrow, so the backlight red, green, and blue light peaks are obvious, and the color saturation after imaging is also high. Therefore, the use of quantum dot backlight technology can greatly improve the display color gamut of liquid crystal display devices, thereby giving them higher color rendering and color reproduction capabilities.

[0004] Traditional MINILED modules mostly use a technical combination of blue light LED chips and quantum films. However, traditional MINILED backlight modules have high costs, low luminous efficiency, and low reliability, and do not have any technical advantages. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a backlight module, aiming to improve the LED luminous efficiency of the quantum dot backlight module, achieve ultra-high module brightness, and at the same time ensure the consistency of the quantum film and improve its reliability.

[0006] Another object of the present application is to provide a display device based on the backlight module described in the present application.

[0007] In order to achieve the above-mentioned object, as a first aspect of the present application, a backlight module is provided, comprising a light emitting diode, a quantum film and an optical component;

[0008] The quantum film comprises quantum dots in the green light band, and the quantum film is arranged in the light emitting direction of the optical component;

[0009] The light emitting diode comprises a blue light chip; the optical component comprises red fluorescent powder, and the optical component is arranged in the light emitting direction of the light emitting diode.

[0010] Optionally, the optical component includes fluorescent glue, and the fluorescent glue covers the light-emitting diodes. Further optionally, the light-emitting diodes are arranged in an array, and the fluorescent glue covers the light-emitting diodes and the gaps between the light-emitting diodes.

[0011] Optionally, the quantum film comprises an upper protective layer and a lower protective layer, and a quantum functional layer located between the upper and lower protective layers, and the quantum functional layer comprises green light band quantum dots.

[0012] Further optionally, the green light band quantum dot comprises a quantum dot core and a quantum dot shell, wherein the quantum dot shell covers the quantum dot core. Further optionally, the quantum dot core is cadmium selenide, the particle size of the cadmium selenide is 2-4 nm, and the quantum dot shell is zinc sulfide or cadmium sulfide.

[0013] Further optionally, the thickness of the quantum dot functional layer is 50-80 μm, and the thickness of the upper protective layer and the lower protective layer is 50-200 μm.

[0014] Optionally, the optical component further includes a diffusion plate, and the diffusion plate is arranged on a side of the quantum film close to the light emitting diode.

[0015] Optionally, the quantum film further comprises red light band quantum dots, and the mass ratio of the green light band quantum dots to the red light band quantum dots is 1:(0-0.5).

[0016] As a second aspect of the present application, a display device is provided, including a liquid crystal panel and the backlight module described in the present application.

[0017] In the technical solution of the present application, an optical component containing red-band phosphor is arranged in the light-emitting direction of the blue light chip of the backlight module, which actively causes the color point of the backlight module to undergo a red shift; at the same time, the quantum dots in the red light excitation band are greatly reduced or completely eliminated in the quantum film in the light-emitting direction of the optical component, and the proportion of quantum dots in the green light excitation band is increased, thereby correcting the color point and offsetting the above-mentioned red shift; at the same time, since the large reduction of quantum dots in the red light excitation band in the quantum film improves the stability of the quantum film, the LED light board can be driven to a higher current, thereby improving the LED luminous efficiency and achieving an overall brightness improvement of the backlight module; and the color point can be adjusted by adjusting the ratio of the red-band phosphor to match different liquid crystal panels, while the composition of the quantum film can remain unchanged, making the backlight module more flexible and versatile in actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application.

[0019] Figure 1 The figure shows the structure schematic diagram of the light emitting diode and fluorescent glue of the present application;

[0020] Figure 2 Shown are schematic diagrams of the structures of conventional quantum films and the quantum films of the present application;

[0021] Figure 3 Shown is a schematic diagram of the optical path process of the backlight module of the present application;

[0022] Figure 4 Shown is a structural schematic diagram of a direct-type backlight module of the present application;

[0023] Figure 5 The figure shows the core-shell structure of quantum dots in the quantum film of the present application;

[0024] Figure 6 The figure shows the light decay test results under different proportions of red band phosphor, red band quantum dots, and green band quantum dots;

[0025] Figure 7 Shown is a schematic structural diagram of a display device of the present application.

[0026] Description of Figure Numbers:

[0027] Table 1

[0028]

[0029] DETAILED DESCRIPTION

[0030] The present application discloses a backlight module and a display device. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It is particularly important to point out that all similar replacements and modifications are obvious to those skilled in the art, and they are all deemed to be included in this application. The products described in this application have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the products described in this article without departing from the content, spirit and scope of this application to implement and apply the technology of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] It should be noted that all directional indications in this article (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In this document, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0034] In this article, if relational terms such as "first" and "second", "step 1" and "step 2", and "(1)" and "(2)" appear, they are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "comprise a..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements. At the same time, the embodiments in this application and the features in the embodiments may be combined with each other without conflict.

[0035] The following is a further description of a backlight module and a display device provided in the present application.

[0036] The traditional MINILED backlight module uses the blue light emitted by the blue light chip to excite the quantum film. The quantum film also contains a large number of quantum dots in the red and green bands. The generated red and green light are then mixed with the system blue light to become white light, providing display light source for the LCD panel. However, the traditional MINILED technology has the following technical problems:

[0037] (1) Due to the color point matching requirements, there is a one-to-one correspondence between the liquid crystal panel and the quantum film formula. Usually, the display product needs to match 2-5 liquid crystal panels, which leads to the diversity of quantum film formulas and models, and cannot achieve centralized supply, resulting in extended production cycles and increased costs.

[0038] (2) The quantum dots in the red light band have a large particle size (5-7nm), and are very likely to be quenched and deactivated by fluorescence under prolonged high temperatures. In order to ensure the reliability of quantum dots, the light board driving current of the MINILED backlight module is generally around 20-40mA, while the maximum driving current can reach 80-100mA. This requires additional optical gain films (brightness enhancement films, DBEF, etc.) for traditional MINILEDs to increase brightness, which is more expensive.

[0039] (3) Red quantum dots have low excitation efficiency and generate more heat. If the red quantum dot content in the quantum film is too high, it will seriously affect the reliability. Therefore, the types of LCD panels that traditional quantum films can match are limited.

[0040] Based on the technical problems of the above-mentioned traditional backlight module, in one aspect of the present application, a backlight module is provided, including a light-emitting diode, a quantum film and an optical component; the quantum film contains quantum dots in the green light band, and the quantum film is arranged in the light-emitting direction of the optical component; the light-emitting diode includes a blue light chip, the optical component contains red phosphor, and the optical component is arranged in the light-emitting direction of the light-emitting diode.

[0041] In the technical solution of the present application, an optical component containing red-band phosphor is arranged in the light-emitting direction of the blue light chip of the backlight module, which actively causes the color point of the backlight module to undergo a red shift; at the same time, the quantum dots in the red light excitation band are greatly reduced or completely eliminated in the quantum film in the light-emitting direction of the optical component, and the proportion of quantum dots in the green light excitation band is increased, thereby correcting the color point and offsetting the above-mentioned red shift; at the same time, since the large reduction of quantum dots in the red light excitation band in the quantum film improves the stability of the quantum film, the LED light board can be driven to a higher current, thereby improving the LED luminous efficiency and achieving an overall brightness improvement of the backlight module; and the color point can be adjusted by adjusting the ratio of the red-band phosphor to match different liquid crystal panels, while the composition of the quantum film can remain unchanged, making the backlight module more flexible and versatile in actual production.

[0042] The optical components in the backlight module of the present application include any components that can control the transmission and processing of light. Figure 1The optical component can be a fluorescent glue 4, which contains red phosphor and covers the light-emitting diode (blue light chip) 3, and the light-emitting diode (blue light chip) 3 is arranged on the circuit board 2; because the fluorescent glue 4 contains red phosphor, it can increase the proportion of red light in the backlight module, thereby reducing the proportion of red-band quantum dots with larger particle size and unstable in the quantum film, and maintaining the screen at a standard color point or a required color point.

[0043] As an example see Figure 2 The quantum film 7 generally includes an upper protective layer 71, a lower protective layer 72, and a quantum functional layer 73 located between the two protective layers, and the quantum functional layer 73 contains green light band quantum dots; the difference from the quantum functional layer of the conventional quantum film is that the quantum functional layer 73 of the present application rarely contains or does not contain red light band quantum dots, that is, it only contains green light band quantum dots or their proportion is relatively high. This change in structural composition can significantly improve the poor stability of red light band quantum dots due to their large particle size, as well as the problem of long-term excitation and high temperature easy fluorescence quenching and inactivation, and can significantly improve the overall reliability of the quantum film, increase the driving current of the backlight module, and realize the overall brightness improvement of the backlight module. In addition, due to the deletion of the red light band quantum dots, the thickness of the quantum film 7 can also be reduced, which is conducive to the thinness of the screen.

[0044] The optical path process of the backlight module of this application can be found in Figure 3 During the operation of the backlight module, under the excitation of the blue light of the light-emitting diode (blue light chip) 3, the fluorescent glue 4 can excite the red light narrow-band emission peak in the 610-650nm band, and the green light band quantum dots in the quantum film 7 can excite the green light narrow-band emission peak in the 530-550nm band under the excitation of high-energy blue light. The green light and red light excited above can be mixed with the blue light of the light-emitting diode (blue light chip) 3 to form white light, providing uniform white light energy for the liquid crystal panel, which can achieve NTSC1931 The color gamut index of more than 100% is similar to that of traditional quantum films. At the same time, compared with traditional MINILED backlight modules, the backlight module of the present application has greatly reduced or eliminated the red band quantum dots in the quantum film 7. Therefore, it is only necessary to ensure that the surface temperature of the quantum film 7 is below 80°C to drive it to a higher current of 80-100mA. The red phosphor added to the fluorescent glue 4 is chemically stable and resistant to high temperatures. By appropriately increasing its content, the proportion of red light in the system is increased, actively causing the color point of the screen to shift red. At the same time, the content of green band quantum dots in the quantum film 7 can be increased for color point correction. While achieving the standard color point of the screen, the ultra-high brightness module index is also achieved simultaneously.

[0045] In another aspect of the present application, there are usually multiple light-emitting diodes (blue light chips) 3, which can be arranged in an array on the circuit board 2, and the fluorescent glue 4 covers the light-emitting diodes (blue light chips) 3 or covers the light-emitting diodes (blue light chips) 3 and the gaps between the light-emitting diodes (blue light chips) 3; wherein, the former covering method has cost advantages and strong light control capabilities, and can be covered on each light-emitting diode (blue light chip) 3 one by one by dispensing, and the weight of a single fluorescent glue 4 can be controlled at 8-20g, and the fluorescent glue 4 for dispensing is usually a "rivet-like" structure with a certain curvature.

[0046] In some embodiments of the present application, the fluorescent glue 4 generally includes silica gel and red fluorescent powder. The quality of the red fluorescent powder is generally adjusted according to the color point requirements and adapted to the quantum film 7. In some other embodiments of the present application, the red fluorescent powder includes but is not limited to fluoride red fluorescent powder, such as fluoride KSF (K2SiF 6+ ) red phosphor, etc.; blue light chips include but are not limited to gallium nitride blue light chips.

[0047] In another aspect of the present application, see for example Figure 4 In addition to the fluorescent glue 4, the optical component can also be a reflective sheet 5, a diffuser 6, an optical gain film 8, etc., or any combination thereof. That is to say, the red phosphor can not only be set on the fluorescent glue 4, but also be set in one or more structures of the reflective sheet 5, the diffuser 6, and the optical gain film 8, thereby actively causing the color point of the backlight module to red shift. The optical gain film 8 includes but is not limited to a diffuser film, a brightness enhancement film, a diffuser-prism composite film DOP, a microlens-prism composite film MOP, a prism-prism composite film POP, a reflective polarization type brightening composite film COP, etc. As an example, the optical component can be a diffuser plate 6 or a combination of a diffuser plate 6 and a fluorescent glue 4, and the diffuser plate 6 is arranged on the side of the quantum film 7 close to the light-emitting diode (blue light chip) 3; the diffuser plate 6 contains red phosphor. Other forms of optical components can be carried out in accordance with this method, which will not be repeated here.

[0048] In another aspect of the present application, in the quantum film 7, the upper protective layer 71 and the lower protective layer 72 of the water-proof and oxygen-proof protection quantum functional layer 73 can still use the isolation film in the conventional quantum film as the protective layer; as a preferred choice to improve the protection effect and reduce the cost, the upper protective layer 71 and the lower protective layer 72 include organic plastics, such as polyethylene terephthalate plastics, polystyrene (PS), polymethyl methacrylate (PMMA), styrene-methyl methacrylate copolymer (MS), etc., wherein the polyethylene terephthalate plastics include but are not limited to polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). The upper protective layer 71 and the lower protective layer 72 use organic plastics at a suitable thickness to maintain the stability of the quantum film 7. Compared with the expensive upper and lower isolation film layers, the quantum film can achieve a cost reduction of more than 20%. The thickness of the upper protective layer 71 and the lower protective layer 72 can be adjusted according to the specific type of plastic selected. Taking PET material as an example, the thickness of the upper protective layer 71 and the lower protective layer 72 is 50-200μm; since the present application reduces the red light band quantum dots in the quantum dot functional layer 73, the layer thickness of the quantum film 7 of the present application can be further reduced, which can be beneficial to the lightweight backlight module and reduce costs. The thickness of the quantum dot functional layer 73 of the present application can be selected to be 50-80μm.

[0049] In some embodiments of the present application, the quantum dot functional layer 73 may also include a small amount of red band quantum dots. The mass ratio of green band quantum dots to red band quantum dots in the quantum dot functional layer 73 is 1:(0-0.25), such as 1:0.25, 1:0.2, 1:0.125, 1:0.05 or 1:0; in some other embodiments of the present application, the mass ratio of red phosphor, green band quantum dots and red band quantum dots is (0.25-0.4):1:(0-0.25).

[0050] In certain embodiments of the present application, the green light band quantum dots and the red light band quantum dots are independently selected from cadmium quantum dots, perovskite quantum dots, and indium phosphide quantum dots. The technical properties of each type of quantum dots are the same. The particle size of the quantum dots can be controlled by blue light excitation to produce light of different color bands. Taking cadmium quantum dots CdSe as an example, particles with a diameter of 2-4nm can be excited by blue light to produce green band light, and particles with a diameter of 5-7nm can be excited by blue light to produce red band light. In some other embodiments of the present application, as an example, the green light band quantum dots of the present application include a quantum dot core and a quantum dot shell. The thickness of the quantum dot shell is 2-5nm, and the core of the quantum dot is coated to form a core-shell structure. See the structural diagram. Figure 5; As an example, cadmium selenide (CdSe) is used as the core of quantum dots with a particle size of 2-4nm. Zinc sulfide (ZnS) or cadmium sulfide (CdS) is set as the outer layer of the CdSe core as the quantum dot shell to cover it and isolate and protect the quantum dot core, that is, CdSe@ZnS or CdSe@CdS.

[0051] In some embodiments of the present application, by adjusting the mass ratio of the red band phosphor (KSF) in the fluorescent glue 4, the red band quantum dots (R-QD) in the quantum film 7, and the green band quantum dots (G-QD), the light decay under different ratios is tested; the results are shown in Tables 2 and Figure 6 ;

[0052] Table 2

[0053]

[0054]

[0055] It can be seen from the data that under the test conditions of 80mA / 60℃ / 90%RH, with the increase of the proportion of KSF red phosphor and the decrease of the proportion of red light band quantum dots (RQD), the time taken for the LED light decay to reach 10% also increases significantly, reaching a maximum value when no RQD is present. The above experimental results show that due to the presence of a large number of large-particle red light band quantum dots in the traditional backlight module, prolonged high temperature can easily lead to fluorescence quenching and inactivation, resulting in poor light decay performance. In accordance with the technical principles of the present application, the technical improvements of significantly reducing or completely eliminating red light band quantum dots in the quantum film 7 and adding red phosphor to the fluorescent glue 4 have been made to make up for the defects in the prior art, improve the light decay performance, overall brightness and overall reliability of the backlight module, and do not require the additional use of high-cost optical gain films.

[0056] In another aspect of the present application, the provided backlight module may be a direct-type backlight module, which can achieve the intended purpose by only making the above-mentioned improvements to the optical components and the quantum film.

[0057] As an example see Figure 4 , the present application provides a direct-type backlight module, comprising:

[0058] A back plate 1, the back plate 1 is surrounded to form a receiving cavity, and the receiving cavity forms a light outlet 11;

[0059] A circuit board 2 is disposed on the bottom of the accommodating cavity;

[0060] The reflector 5 is disposed on the side of the circuit board 2 away from the bottom of the accommodating cavity and extends along the side wall of the accommodating cavity to connect to the side wall of the accommodating cavity at the light outlet 11; the reflector 5 on the circuit board 2 is provided with an avoidance hole 51;

[0061] The light emitting diode (blue light chip) 3 is arranged in the avoidance hole 51 and mounted on the circuit board 2; the fluorescent glue 4 contains red fluorescent powder and covers the light emitting diode (blue light chip) 3;

[0062] A diffuser plate 6, the diffuser plate 6 is covered at the light outlet 11 of the accommodating cavity;

[0063] The quantum film 7 is arranged on the side of the diffusion plate 6 away from the back plate 1 and abuts against it. The quantum film 7 comprises green light band quantum dots and red light band quantum dots. The mass ratio of the green light band quantum dots to the red light band quantum dots is 1:(0-0.5).

[0064] In some embodiments of the present application, an optical gain film 8 may be further provided. The optical gain film 8 is provided on and abuts against a side of the quantum film 7 that is away from the back plate 1 .

[0065] The number and position of the avoidance holes 51 are set according to the number and position of the required light emitting diodes (blue light chips) 3. The abutment and connection can be achieved by using an adhesive, such as a rubber strip.

[0066] In another aspect of the present application, a display device is provided, comprising a liquid crystal panel and any one of the backlight modules provided in the present application.

[0067] As an example see Figure 7 The present application provides a display device, comprising the direct-type backlight module mentioned above in the present application, and

[0068] The bent portion 12 is extended from the edge of the back plate 1 and bent toward one side of the diffuser plate 6 to form the bent portion 12 .

[0069] The liquid crystal panel 9 is covered at the light outlet 11 and abuts against the bent portion 12. The abutting method may be achieved by using an adhesive, such as a rubber strip.

[0070] The overall brightness and reliability of the display device using the backlight module provided by the present application are significantly improved; moreover, the backlight module of the present application can fix the formula and model of the quantum film, and perform color point correction by adjusting the proportion of the red band phosphor in the fluorescent glue. This design method is flexible and can change the ratio of the fluorescent glue to adapt to a variety of LCD panels, thereby achieving centralized supply of a single model of quantum film and greatly reducing costs.

[0071] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A backlight module, characterized in that: Includes light emitting diodes, quantum films and optical components; The quantum film comprises quantum dots in the green light band, and the quantum film is arranged in the light emitting direction of the optical component; The light emitting diode comprises a blue light chip; the optical component comprises red fluorescent powder, and the optical component is arranged in the light emitting direction of the light emitting diode.

2. The backlight module according to claim 1, characterized in that: The optical component includes fluorescent glue, and the fluorescent glue covers the light emitting diode.

3. The backlight module according to claim 2, characterized in that: The light emitting diodes are arranged in an array, and the fluorescent glue covers the light emitting diodes and the gaps between the light emitting diodes.

4. The backlight module according to claim 1, characterized in that: The quantum film comprises an upper protective layer and a lower protective layer, and a quantum functional layer located between the upper and lower protective layers, wherein the quantum functional layer comprises quantum dots in the green light band.

5. The backlight module according to claim 4, characterized in that: The green light band quantum dot comprises a quantum dot core and a quantum dot shell, wherein the quantum dot shell covers the quantum dot core, and the thickness of the quantum dot shell is 2-5 nm.

6. The backlight module according to claim 5, characterized in that: The quantum dot core is cadmium selenide, the particle size of the cadmium selenide is 2-4 nm, and the quantum dot shell is zinc sulfide or cadmium sulfide.

7. The backlight module according to claim 4, characterized in that: The thickness of the quantum dot functional layer is 50-80 μm, and the thickness of the upper protective layer and the lower protective layer is 50-200 μm.

8. The backlight module according to claim 1 or 2, characterized in that: The optical component further comprises a diffusion plate, and the diffusion plate is arranged on a side of the quantum film close to the light emitting diode.

9. The backlight module according to any one of claims 1 to 8, characterized in that: The quantum film also contains red light band quantum dots, and the mass ratio of the green light band quantum dots to the red light band quantum dots is 1:(0-0.5).

10. A display device, characterized in that: It comprises a liquid crystal panel and the backlight module according to any one of claims 1 to 9.

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