Quantum dot film, backlight module and display panel

Abstract

The utility model discloses a quantum dot film, a backlight module and a display panel, and belongs to the technical field of display. The quantum dot film comprises a quantum dot layer, the quantum dot layer comprises a red light quantum dot unit, and the red light wavelength of the red light quantum dot unit excited by light is 650-670 nm; the functional layer comprises a first reflection increasing film layer and / or a first antireflection film layer, the first reflection increasing film layer is arranged on the light incident side of the quantum dot layer, and the target reflection increasing wavelength of the first reflection increasing film layer is 650-670 nm; the first anti-reflection film is arranged on the light emitting side of the quantum dot layer, and the target anti-reflection wavelength of the first anti-reflection film is 650-670 nm. The technical problem of visual fatigue caused by the display device is solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a quantum dot film, a backlight module and a display panel. Background Art

[0002] With the continuous development of display technology, consumers have higher and higher requirements for the color gamut of display devices. Corresponding to consumers' requirements for the color gamut of display devices, high color gamut display devices have gradually become the mainstream products in the development of display technology. At present, display devices mainly achieve high color gamut color rendering by setting quantum dot films.

[0003] In related technologies, quantum dot films can produce rich and colorful visual effects, but while pursuing extreme indicators such as brightness, bright colors, and high color gamut, it is easy to ignore the visual fatigue caused by users watching for a long time; and because there is a large amount of blue light with high energy in the light of the display device, the human eye will be stimulated by blue light for a long time and with high intensity, which will aggravate visual fatigue and even cause irreversible visual damage.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Utility Model Content

[0005] The main purpose of this application is to provide a quantum dot film, a backlight module and a display panel, aiming to alleviate the technical problem of visual fatigue caused by display devices.

[0006] To achieve the above object, the embodiment of the present application provides a quantum dot film, the quantum dot film comprising:

[0007] A quantum dot layer, the quantum dot layer comprising: a red light quantum dot unit, wherein the red light wavelength of the red light quantum dot unit excited by light is 650-670nm;

[0008] At least one functional layer, the functional layer comprising: a first anti-reflection film layer and / or a first anti-reflection film layer, wherein the first anti-reflection film is arranged on the light incident side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm; the first anti-reflection film is arranged on the light output side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm.

[0009] In one embodiment, the quantum dot film further includes: at least one substrate layer, and the substrate layer is disposed on one side or two opposite sides of the quantum dot layer.

[0010] In one embodiment, the first anti-reflection film layer comprises: a plurality of first high refractive index films and first low refractive index films arranged alternately, wherein the optical thickness of the first high refractive index films and the first low refractive index films are both λ / 4, where λ is the wavelength of the incident light;

[0011] And / or, the first antireflection film comprises: a plurality of alternately arranged second high refractive index films and second low refractive index films, the optical thickness of the second high refractive index films and the second low refractive index films are both λ / 2, λ being the wavelength of the incident light.

[0012] The embodiment of the present application further provides a backlight module, which includes the quantum dot film as described above.

[0013] In one embodiment, the backlight module further includes:

[0014] light source;

[0015] A light homogenizing plate, arranged on the light emitting side of the light source;

[0016] The quantum dot film is arranged on the light-emitting side of the light-diffusing plate;

[0017] At least one second anti-reflection film layer is disposed in contact with the light-emitting side and / or the light-incoming side of the light diffuser to balance the light-emitting intensity in all directions.

[0018] In one embodiment, the target reflection enhancement wavelength of the second reflection enhancement film layer is consistent with the wavelength of the light source;

[0019] And / or, the reflectivity of the second anti-reflection film layer is 50-70%.

[0020] The present application also provides a display panel, which includes: the quantum dot film as described above or the backlight module as described above.

[0021] In one embodiment, the display panel further includes: a color filter, wherein the color filter includes a substrate, a second anti-reflection film layer, and a color resistance layer which are sequentially arranged along the light emitting direction.

[0022] In one embodiment, the target anti-reflection wavelength of the second anti-reflection film layer is 650-670 nm.

[0023] In one embodiment, the second anti-reflection film layer is disposed between the red color resist of the color resist layer and the substrate, and the second anti-reflection film layer and the red color resist have the same area.

[0024] The present application discloses a quantum dot film, which includes: a quantum dot layer, which includes: a red light quantum dot unit, wherein the red light wavelength of the red light quantum dot unit excited by light is 650-670nm; at least one functional layer, which includes: a first anti-reflection film layer and / or a first anti-reflection film layer, wherein the first anti-reflection film is arranged on the light incident side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm; the first anti-reflection film is arranged on the light exiting side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm. It is used to improve the extraction efficiency of red light with a wavelength of 650-670nm. The present application sets a specific red light quantum dot unit in the quantum dot film, thereby stimulating beneficial red light in the wavelength range of 650-670nm, and the red light in this wavelength range can effectively relieve the adjustment power of the ciliary muscles of the eye, improve the blood circulation of the fundus, and promote the secretion of beneficial neurotransmitters; and long-term use can bring visual gain that relieves fatigue, help delay vision loss, and bring healthier and more comfortable conditions for using display devices, thereby alleviating visual fatigue caused by the blue light in the light of the display device. Furthermore, a functional layer is also provided in the quantum dot film, including: a first anti-reflection film layer with a target anti-reflection wavelength of 650-670nm and / or a first anti-reflection film layer with a target anti-transmission wavelength of 650-670nm, so as to improve the extraction efficiency of the beneficial red light in the wavelength range of 650-670nm in a targeted manner, so as to further enhance the eye protection effect and alleviate the visual fatigue caused by the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a quantum dot film involved in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of an anti-reflection film layer and / or an anti-reflection film layer involved in an embodiment of the present application;

[0027] Figure 3 This is a schematic diagram of the structure of a conventional backlight module involved in the embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a backlight module involved in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the display principle of a conventional color filter involved in the embodiment of the present application;

[0030] Figure 6 It is a structural schematic diagram of a color filter involved in an embodiment of the present application.

[0031] Description of Reference Numerals

[0032] 11 First substrate layer 12 Second substrate layer 20 Quantum dot layer 31 The first anti-reflection film 32 The first anti-reflection coating 110 light source 120 Light diffuser 130 Quantum dot film 140 The second anti-reflection film layer 210 substrate 220 The second anti-reflection coating 230 Color resistance layer 231 Red color resistance

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there are cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter described in the claims.

[0035] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0036] And " scope " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be including end value or excluding end value, and can be combined arbitrarily, that is, any lower limit can form a scope with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0037] In addition, the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application. 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.

[0038] A first aspect of an embodiment of the present application provides a quantum dot film, the quantum dot film comprising:

[0039] The quantum dot layer includes: a red light quantum dot unit, wherein the red light wavelength of the red light quantum dot unit excited by light is 650-670nm;

[0040] In a feasible embodiment, the quantum dot layer includes: quantum dot units, and the quantum dot units are covered with quantum dot materials, which can emit light of different wavelengths under the excitation of a light source, such as red light, green light, blue light, etc., and finally achieve color display by mixing the three primary colors.

[0041] Furthermore, the quantum dot unit includes: a red light quantum dot unit, the wavelength of the red light excited by light is 650-670nm; for example, the wavelength of the red light excited by light of the red light quantum dot unit is: 650nm, 655nm, 660nm, 665nm, 670nm, etc. Red light within this wavelength range can change the imaging focus of the eye through a longer wavelength, so that the image of the object falls on the appropriate position of the retina, thereby achieving the effect of alleviating myopia and preventing and controlling myopia; at the same time, under the irradiation of low-intensity red light, the pressure on the lens is reduced, which can also relieve visual fatigue of the eyes; therefore, it is determined that the wavelength of the red light excited by light of the red light quantum dot unit in the quantum dot film of the present application is 650-670nm.

[0042] Exemplarily, the quantum dot film is applied to a backlight module and / or a display device whose light source is blue light. The quantum dot layer of the quantum dot film includes: a quantum dot unit and a blue light transmission unit, wherein the blue light transmission unit is not covered with quantum dot materials so that the blue light is directly transmitted out; the quantum dot unit includes: a red light quantum dot unit, a red-labeled quantum dot unit and a green-labeled quantum dot unit, wherein the red light wavelength of the red light quantum dot unit excited by light is 650-670nm; for example, 650nm, 655nm, 660nm, 66 5nm, 670nm, etc.; the wavelength of red light excited by the red quantum dot unit is 618-685nm; for example, 618nm, 620nm, 630nm, 640nm, 650nm, 660nm, 670nm, 680nm, 685nm, etc.; the wavelength of green light excited by the green quantum dot unit is 506-582nm; for example, 506nm, 510nm, 520nm, 540nm, 560nm, 580nm, 582nm, etc.

[0043] Optionally, an isolation member is provided between each quantum dot unit and the blue light transmission unit.

[0044] At least one functional layer, the functional layer includes: a first anti-reflection film layer and / or a first anti-reflection film layer, wherein the first anti-reflection film is arranged on the light incident side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm; the first anti-reflection film is arranged on the light output side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm.

[0045] In a feasible embodiment, the quantum dot film may include at least one functional layer, and the functional layer includes: a first anti-reflection film layer and / or a first anti-reflection film layer. If the functional layer includes a first anti-reflection film layer, the first anti-reflection film layer is arranged on the light incident side of the quantum dot layer, and may be adjacent to the quantum dot layer, or other functional layers may be arranged between the first anti-reflection film layer and the quantum dot layer. If the functional layer includes a first anti-reflection film layer, the first anti-reflection film layer is arranged on the light exiting side of the quantum dot layer, and may be adjacent to the quantum dot layer, or other functional layers may be arranged between the first anti-reflection film layer and the quantum dot layer. The target anti-reflection wavelength of the first anti-reflection film layer is: 650-670nm; for example, 650nm, 655nm, 660nm, 665nm, 670nm, etc. The target anti-reflection wavelength of the first anti-reflection film layer is: 650-670nm; 650nm, 655nm, 660nm, 665nm, 670nm, etc. Thereby maximizing the extraction efficiency of the eye-protecting red light with a wavelength of 650-670nm and improving the eye-protecting effect.

[0046] In a feasible embodiment, the quantum dot film further includes: at least one substrate layer, which is disposed on one side or two opposite sides of the quantum dot layer and is used to carry the quantum dot layer and / or the functional layer.

[0047] In a feasible embodiment, the substrate layer includes: a first substrate layer and a second substrate layer; and a quantum dot layer disposed between the first substrate layer and the second substrate layer.

[0048] In a feasible embodiment, the quantum dot layer is disposed between the first substrate layer and the second substrate layer using a "sandwich" structure, and the two substrate layers are used to block moisture and oxygen as much as possible to protect the quantum dot layer.

[0049] For example, refer to Figure 1 The quantum dot film can be applied to a backlight module and / or a display device, and the arrow is the light emitting direction of the light source of the backlight module and / or the display device; the quantum dot film includes: a first substrate layer 11, a first anti-reflective film layer 31, a quantum dot layer 20, a first anti-reflective film layer 32 and a second substrate layer 12 arranged in sequence along the light emitting direction.

[0050] Exemplarily, the quantum dot film may include: a first anti-reflection film layer and a quantum dot layer arranged in sequence.

[0051] Exemplarily, the quantum dot film may include: a quantum dot layer and a first anti-reflection film layer disposed in sequence.

[0052] Exemplarily, the quantum dot film may include: a first substrate layer, a first anti-reflection film layer, a quantum dot layer, and a first anti-reflection film layer arranged in sequence.

[0053] Exemplarily, the quantum dot film may include: a first anti-reflection film layer, a quantum dot layer, a first anti-reflection film layer, and a second substrate layer arranged in sequence.

[0054] Exemplarily, the quantum dot film may include: a first anti-reflection film layer, a first substrate layer, a quantum dot layer, a second substrate layer, and a first anti-reflection film layer arranged in sequence.

[0055] Exemplarily, the quantum dot film may include: a first substrate layer, a first anti-reflection film layer, a quantum dot layer, a second substrate layer, and a first anti-reflection film layer arranged in sequence.

[0056] Exemplarily, the quantum dot film may include: a first anti-reflection film layer, a first substrate layer, a quantum dot layer, a first anti-reflection film layer, and a second substrate layer arranged in sequence.

[0057] Exemplarily, the quantum dot film can be applied to a backlight module and / or a display device; the first anti-reflection film layer includes: an anti-reflection film layer No. 1 and an anti-reflection film layer No. 2, and the first anti-reflection film layer includes: an anti-reflection film layer No. 1 and an anti-reflection film layer No. 2; the quantum dot film includes: an anti-reflection film layer No. 1, a first substrate layer, an anti-reflection film layer No. 2, a quantum dot layer, an anti-reflection film layer No. 1, a second substrate layer, and an anti-reflection film layer No. 2, which are arranged in sequence along the light emitting direction of the light source of the backlight module and / or the display device.

[0058] Anti-reflection film uses the optical interference effect of thin film to increase the intensity and purity of reflected light. When light hits the surface of anti-reflection film, the thickness and refractive index of the film will also cause light interference, causing the phases of light of specific wavelengths to overlap, thereby enhancing the intensity of reflected light.

[0059] In actual application, the first anti-reflection film layer is arranged on the light incident side of the quantum dot layer, so that the light excited by the quantum dot layer in the opposite direction of the light output direction can be reflected back to the light output direction by the anti-reflection film, thereby increasing the front light output rate of the light and improving the light extraction efficiency.

[0060] Optionally, the reflectivity of the first anti-reflection film layer is greater than 99%.

[0061] Anti-reflection coating uses the optical interference effect of thin films to increase the brightness and clarity of transmitted light. When light passes through the anti-reflection coating, the thickness and refractive index of the film will cause light interference, causing the phases of light of specific wavelengths to overlap, thereby enhancing the brightness of the transmitted light.

[0062] In practical applications, the first anti-reflection film layer is arranged on the light-emitting side of the quantum dot layer, so that the light excited by the quantum dot layer in the light-emitting direction can pass through the anti-reflection film to the maximum extent, thereby increasing the front light emission rate of the light and improving the light extraction efficiency.

[0063] Optionally, the transmittance of the first anti-reflection film layer is greater than 99%.

[0064] In this embodiment, by setting a specific red light quantum dot unit in the quantum dot film, beneficial red light in the wavelength range of 650-670nm is stimulated, and the red light in this wavelength range can effectively relieve the adjustment of the ciliary muscles of the eye, improve the blood circulation of the fundus, and promote the secretion of beneficial neurotransmitters; and long-term use can bring visual gain that relieves fatigue, help delay vision loss, and bring healthier and more comfortable conditions for using display devices, thereby alleviating visual fatigue caused by the blue light in the light of the display device. Furthermore, a functional layer is also provided in the quantum dot film, including: a first anti-reflection film layer with a target anti-reflection wavelength of 650-670nm and / or a first anti-reflection film layer with a target anti-transmission wavelength of 650-670nm, so that the extraction efficiency of the beneficial red light in the wavelength range of 650-670nm can be targeted to further enhance the eye protection effect and relieve visual fatigue caused by the display device.

[0065] In a feasible embodiment, the first anti-reflection film layer includes: multiple layers of alternating first high refractive index film and first low refractive index film, the optical thickness of the first high refractive index film and the first low refractive index film are both λ / 4, λ is the wavelength of the incident light, that is, the target anti-reflection wavelength.

[0066] In a feasible embodiment, the first anti-reflection film includes: a plurality of alternating second high refractive index films and second low refractive index films, the optical thickness of the second high refractive index films and the second low refractive index films are both λ / 2, λ is the wavelength of the incident light, that is, the target anti-reflection wavelength.

[0067] In one possible embodiment, referring to Figure 2 The first anti-reflection film layer and / or the first anti-reflection film layer comprises a plurality of alternating high refractive index films and low refractive index films, and the arrangement thereof may be: G(HL) p HA=GHLHL……HLHLHA, where A represents an air layer, G represents a substrate layer, H represents a high refractive index film, L represents a low refractive index film, and 2p+1 is the total number of film layers, p=1, 2, …, n. The optical thickness of the first high refractive index film and the first low refractive index film of the first anti-reflection film layer are both λ / 4; and the optical thickness of the second high refractive index film and the second low refractive index film of the first anti-reflection film layer are both λ / 2, where λ is the wavelength of the incident light.

[0068] Optionally, when setting the material and size of the anti-reflection film layer, the appropriate materials for the high refractive index film and the low refractive index film can be determined based on the target anti-reflection wavelength and the material of the substrate layer when preparing the anti-reflection film; and then the total number of anti-reflection film layers can be determined based on the target transmittance.

[0069] Exemplarily, the substrate layer when preparing the first anti-reflection film layer is the first substrate layer, the first substrate layer is PET (polyethylene terephthalate), and the target anti-reflection wavelength is 650nm; in order to maximize the extraction efficiency of light of this wavelength, the target reflectivity is greater than 99%; and then it is determined to use hafnium dioxide or zirconium dioxide with a refractive index of 1.92 as the material of the high refractive index film, and silicon dioxide with a refractive index of 1.47 as the material of the low refractive index film. Determine the reflectivity of the first anti-reflection film layer under each number of layers, and refer to Table 1 below for the results. In order to extract the red light excited by the quantum dots with the maximum efficiency, the total number of layers of the film is determined to be 27 layers, and its reflectivity reaches 99.2%.

[0070] Table 1:

[0071]

[0072]

[0073] Exemplarily, the substrate layer when preparing the first anti-reflection film layer is the second substrate layer, the second substrate layer is PET (polyethylene terephthalate), and the target anti-reflection wavelength is 650nm; in order to maximize the extraction efficiency of light of this wavelength, the target transmittance is greater than 99%; and then determine to use hafnium dioxide or zirconium dioxide with a refractive index of 1.92 as the material of the high refractive index film, and use silicon dioxide with a refractive index of 1.47 as the material of the low refractive index film. Determine the transmittance of the first anti-reflection film layer under each number of layers, and refer to Table 2 below for the results. In order to extract the red light excited by the quantum dots with the maximum efficiency, the total number of layers of the film is determined to be 27 layers, and its transmittance reaches 99.2%.

[0074] Table 2:

[0075] 2p Light transmittance 2 0.002026111 4 0.06789687 6 0.217287226 8 0.406895925 10 0.587057763 12 0.729798096 14 0.830458093 16 0.896434358 18 0.937776523 20 0.962988499 22 0.978116474 24 0.987106947 26 0.992419735

[0076] A second aspect of the embodiment of the present application provides a backlight module, the backlight module comprising the quantum dot film as described above, wherein the quantum dot film comprises:

[0077] The quantum dot layer includes: a red light quantum dot unit, wherein the red light wavelength of the red light quantum dot unit excited by light is 650-670nm;

[0078] At least one functional layer, the functional layer includes: a first anti-reflection film layer and / or a first anti-reflection film layer, wherein the first anti-reflection film is arranged on the light incident side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm; the first anti-reflection film is arranged on the light output side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm.

[0079] In a feasible embodiment, the quantum dot film further includes: at least one substrate layer, and the substrate layer is disposed on one side or two opposite sides of the quantum dot layer.

[0080] In one feasible implementation, the first anti-reflection film layer comprises: a plurality of first high refractive index films and first low refractive index films alternately arranged, the optical thickness of the first high refractive index films and the first low refractive index films are both λ / 4, λ is the wavelength of the incident light;

[0081] And / or, the first antireflection film includes: a plurality of alternately arranged second high refractive index films and second low refractive index films, the optical thickness of the second high refractive index films and the second low refractive index films are both λ / 2, λ being the wavelength of the incident light.

[0082] In a feasible implementation manner, the backlight module further includes:

[0083] Light source: The light source may be an LED (light-emitting diode), a mini LED, etc., which is not limited in this embodiment.

[0084] The light homogenizer is arranged on the light output side of the light source to concentrate the uneven light emitted by the light source into an evenly distributed area, and make the density and intensity of the light consistent within the area to achieve a uniform brightness effect.

[0085] The quantum dot film is arranged on the light-emitting side of the light-diffusing plate, so that it can receive the light of uniform density and intensity emitted by the light source and processed by the light-diffusing plate, and then stimulate light of a specific wavelength based on this light.

[0086] At least one second anti-reflection film layer is disposed in contact with the light-emitting side and / or the light-incoming side of the light diffuser to balance the light-emitting intensity in all directions.

[0087] In one possible embodiment, referring to Figure 3 , Figure 3 The middle arrow indicates the light emitted by the light source 110; the light type of the light emitted by the visible light source 110 is Lambert-shaped, that is, the intensity at the center is the largest and the intensity around is weak. Although the light homogenizer 120 can concentrate the uneven light emitted by the light source 110 to an evenly distributed area to a certain extent, there is still a problem of at least partial uneven brightness. Therefore, the present application sets a second anti-reflection film layer 140 on one side surface of the light homogenizer 120 of the backlight module, wherein the second anti-reflection film layer 140 can be set between the light homogenizer 120 and the quantum dot film 130, and can also be set on the side surface of the light homogenizer 120 away from the quantum dot film 130. At least part of the light emitted by the light source 110 is reflected by the second anti-reflection film layer 140 to increase the optical path of the light; and due to the reflection, the final emission direction of the light will change, and it can be emitted from the area with weaker light intensity before, that is, the light intensity of the area with weaker light intensity is increased, and the energy distribution is balanced to improve the uniformity of the brightness and chromaticity of the backlight module.

[0088] For example, refer to Figure 4 , Figure 4 The middle arrow indicates the propagation path of the light emitted by the light source 110; the backlight module also includes: the light source 110; and the second anti-reflection film layer 140, the light homogenizer 120 and the quantum dot film 130 arranged in sequence in the light emitting direction of the light source 110. The second anti-reflection film layer 140 reflects at least part of the light emitted by the light source 110 to increase the optical path of the light; and due to the reflection, the final emission direction of the light will change, and it can be emitted from the area with weaker light intensity before, that is, the light intensity of the area with weaker light intensity is increased, and the energy distribution is balanced to improve the uniformity of brightness and chromaticity.

[0089] Exemplarily, the backlight module further includes: a light source, and a light homogenizing plate, a second anti-reflection film layer, and a quantum dot film which are sequentially arranged in the light emitting direction of the light source.

[0090] In one feasible implementation, the target reflection enhancement wavelength of the second reflection enhancement film layer is consistent with the wavelength of the light source. By making the target reflection enhancement wavelength of the second reflection enhancement film layer consistent with the wavelength of the light emitted by the light source, the reflection enhancement effect of the second reflection enhancement film layer can be improved. The wavelength of the light emitted by the light source can be set according to actual needs.

[0091] Optionally, the wavelength of the light emitted by the light source is blue light of 400-450nm, for example, blue light of wavelength 400nm, 410nm, 420nm, 430nm, 440nm, 450nm, etc. Since the light source is blue light, the quantum dot layer of the quantum dot film may include: a red light quantum dot unit covered with a quantum dot material, a green light quantum dot unit, and a blue light transmission unit not covered with a quantum dot material, so that the blue light is directly transmitted to form three primary colors.

[0092] In a feasible implementation, the reflectivity of the second anti-reflection film layer is 50-70%, for example, the reflectivity of the second anti-reflection film layer is 50%, 55%, 60%, 65%, 70%, etc. Since the function of the second anti-reflection film layer is to change the Lambert-like light type emitted by the light source and balance the light intensity in all directions; therefore, the reflectivity of the second anti-reflection film layer should not be too high, otherwise it may reduce the low penetration ratio of light and lose light energy.

[0093] Optionally, the second anti-reflection film layer includes multiple layers of high refractive index films and low refractive index films arranged alternately, and the arrangement thereof may be: G(HL) p HA=GHLHL…HLHLHA, wherein A represents the air layer, G represents the substrate layer, H represents the high refractive index film, L represents the low refractive index film, and 2p+1 is the total number of film layers, and p=1, 2,…, n.

[0094] Exemplarily, the target reflection wavelength of the second reflection enhancement film layer is 450nm, and the target reflectivity is 50-70%; further, it is determined to use titanium dioxide with a refractive index of 2.52 as the material of the high refractive index film, and silicon dioxide with a refractive index of 1.47 as the material of the low refractive index film. The reflectivity of the second reflection enhancement film layer under each number of layers is determined, and the results are referred to Table 3 below. Obviously, the greater the refractive index difference between the low refractive index film and the high refractive index film, the greater the total number of film layers, and the greater the reflectivity of the film layer. In order to improve the uniformity of light output, the total number of film layers is determined to be 7 layers, and its reflectivity is 65.6%.

[0095] Table 3:

[0096] 2p Reflectivity 2 0.037850341 4 0.31124548 6 0.655944219 8 0.862930269 10 0.950588128 12 0.982844048 14 0.994121688 16 0.997995013 18 0.999317198 20 0.999767594 22 0.99992091 24 0.999973087 26 0.999990842

[0097] A third aspect of the embodiments of the present application provides a display panel, which includes: the quantum dot film as described above, or the backlight module as described above.

[0098] Quantum dot films include:

[0099] The quantum dot layer includes: a red light quantum dot unit, wherein the red light wavelength of the red light quantum dot unit excited by light is 650-670nm;

[0100] At least one functional layer, the functional layer includes: a first anti-reflection film layer and / or a first anti-reflection film layer, wherein the first anti-reflection film is arranged on the light incident side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm; the first anti-reflection film is arranged on the light output side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm.

[0101] In a feasible embodiment, the quantum dot film further includes: at least one substrate layer, and the substrate layer is disposed on one side or two opposite sides of the quantum dot layer.

[0102] In one feasible implementation, the first anti-reflection film layer comprises: a plurality of first high refractive index films and first low refractive index films alternately arranged, the optical thickness of the first high refractive index films and the first low refractive index films are both λ / 4, λ is the wavelength of the incident light;

[0103] And / or, the first antireflection film includes: a plurality of alternately arranged second high refractive index films and second low refractive index films, the optical thickness of the second high refractive index films and the second low refractive index films are both λ / 2, λ being the wavelength of the incident light.

[0104] The backlight module also includes:

[0105] light source;

[0106] A light homogenizing plate is arranged on the light emitting side of the light source;

[0107] The quantum dot film is arranged on the light-emitting side of the light-diffusing plate;

[0108] At least one second anti-reflection film layer is disposed in contact with the light-emitting side and / or the light-incoming side of the light diffuser to balance the light-emitting intensity in all directions.

[0109] In one feasible implementation, the target reflection enhancement wavelength of the second reflection enhancement film layer is consistent with the wavelength of the light source;

[0110] And / or, the reflectivity of the second anti-reflection film layer is 50-70%.

[0111] In one feasible embodiment, the display panel further includes: a color filter that can reflect or absorb light of other wavelengths and selectively pass light of a specific wavelength to precisely control the color, wavelength and intensity of the light.

[0112] For example, refer to Figure 5 The three primary colors of the color filter, R (red), G (green), and B (blue), are arranged in a certain pattern and correspond one-to-one to the TFT sub-pixels on the TFT (Thin Film Transistor) substrate, where one pixel is composed of three sub-pixels. The light emitted by the light source in the display panel is converted into corresponding R, G, and B color light after passing through the color filter, and the voltage value applied to each sub-pixel can be adjusted through the TFT array, thereby changing the projection intensity of each color light; and when R, G, and B color lights of different intensities are mixed together, color display can be achieved.

[0113] The color filter comprises a substrate, a second anti-reflection film layer and a color resistance layer which are sequentially arranged along the light emitting direction.

[0114] In this embodiment, by providing a second anti-reflection film layer in the color filter, the brightness of the transmitted light is enhanced by the anti-reflection film, thereby increasing the forward light output rate of the display device and improving the light extraction efficiency.

[0115] In one feasible implementation, the target anti-reflection wavelength of the second anti-reflection film layer is: 650-670nm; for example, 650nm, 655nm, 660nm, 665nm, 670nm, etc. In order to improve the eye protection effect of the display panel, the target anti-reflection wavelength of the second anti-reflection film layer is set to: 650-670nm; because the light in this band is beneficial red light, it can effectively relieve eye fatigue. Therefore, the target anti-reflection wavelength of the second anti-reflection film layer is set to: 650-670nm, which can specifically improve the extraction efficiency of beneficial red light in the wavelength range of 650-670nm, so as to further improve the eye protection effect and relieve visual fatigue caused by the display device.

[0116] In a feasible implementation manner, the second anti-reflection film layer is disposed between the red color resist of the color resist layer and the substrate, and the second anti-reflection film layer and the red color resist have the same area.

[0117] In one possible embodiment, referring to Figure 6 , the red color resist 231 of the color resist layer 230 can pass red light; by setting the second anti-reflection film layer 220 with the same area as the red color resist 231 only between the red color resist 231 and the substrate 210, the blocking of other light (for example, blue light, green light, etc.) by the second anti-reflection film layer 220 is avoided, thereby ensuring the extraction efficiency of light of each wavelength.

[0118] Optionally, the second anti-reflection film layer includes multiple layers of high refractive index films and low refractive index films arranged alternately, and the arrangement thereof may be: G(HL) p HA=GHLHL…HLHLHA, wherein A represents the air layer, G represents the substrate, H represents the high refractive index film, L represents the low refractive index film, and 2p+1 is the total number of film layers, p=1, 2,…, n.

[0119] Exemplarily, the substrate for preparing the second anti-reflection film layer is inorganic glass, and the target anti-reflection wavelength is 650nm; in order to maximize the extraction efficiency of light of this wavelength, the target transmittance is greater than 99%; and then it is determined to use zinc sulfide with a refractive index of 2.38 as the material of the high refractive index film, and magnesium difluoride with a refractive index of 1.38 as the material of the low refractive index film. The transmittance of the second anti-reflection film layer under each number of layers is determined, and the results are referred to Table 4 below. In order to extract the eye-protecting red light of a specific wavelength with the greatest efficiency and to minimize costs, the total number of layers of the film is determined to be 15, and its transmittance reaches 99.5%.

[0120] Table 4:

[0121] 2p Light transmittance 2 0.047700822 4 0.338744296 6 0.680051204 8 0.875515443 10 0.955891777 12 0.984900192 14 0.994892183 16 0.998279177 18 0.999421048 20 0.999805308 22 0.999934538 24 0.999977991 26 0.9999926

[0122] In this embodiment, based on the light path in the display panel, the light source and red light of a specific wavelength are directional-reflected and transmitted, so that the light source is more uniform and the red light extraction efficiency is higher, thereby further improving the eye protection effect of the display panel and alleviating the user's visual fatigue.

[0123] The above are only preferred embodiments of the present application, and do not limit the scope of the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of patent protection of the present application.

Claims

1. A quantum dot film, characterized in that: The quantum dot film comprises: A quantum dot layer, the quantum dot layer comprising: a red light quantum dot unit, wherein the red light wavelength of the red light quantum dot unit excited by light is 650-670nm; At least one functional layer, the functional layer comprising: a first anti-reflection film layer and / or a first anti-reflection film layer, wherein the first anti-reflection film is arranged on the light incident side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm; the first anti-reflection film is arranged on the light output side of the quantum dot layer, and its target anti-reflection wavelength is: 650-670nm.

2. The quantum dot film according to claim 1, characterized in that The quantum dot film further includes: at least one substrate layer, and the substrate layer is disposed on one side or two opposite sides of the quantum dot layer.

3. The quantum dot film according to claim 1, characterized in that The first anti-reflection film layer comprises: a plurality of first high refractive index films and first low refractive index films arranged alternately, wherein the optical thickness of the first high refractive index films and the first low refractive index films are both λ / 4, where λ is the wavelength of the incident light; And / or, the first antireflection film comprises: a plurality of alternately arranged second high refractive index films and second low refractive index films, the optical thickness of the second high refractive index films and the second low refractive index films are both λ / 2, λ being the wavelength of the incident light.

4. A backlight module, characterized in that: The backlight module comprises: the quantum dot film according to any one of claims 1 to 3.

5. The backlight module according to claim 4, characterized in that: The backlight module also includes: light source; A light homogenizing plate, arranged on the light emitting side of the light source; The quantum dot film is arranged on the light-emitting side of the light-diffusing plate; At least one second anti-reflection film layer is disposed in contact with the light-emitting side and / or the light-incoming side of the light diffuser to balance the light-emitting intensity in all directions.

6. The backlight module according to claim 5, characterized in that: The target reflection enhancement wavelength of the second reflection enhancement film layer is consistent with the wavelength of the light source; And / or, the reflectivity of the second anti-reflection film layer is 50-70%.

7. A display panel, characterized in that: The display panel comprises: the quantum dot film according to any one of claims 1 to 3, or the backlight module according to any one of claims 4 to 6.

8. The display panel according to claim 7, wherein: The display panel further includes: a color filter, which includes a substrate, a second anti-reflection film layer and a color resistance layer which are sequentially arranged along the light emitting direction.

9. The display panel according to claim 8, wherein: The target anti-reflection wavelength of the second anti-reflection film layer is 650-670nm.

10. The display panel according to claim 8, wherein: The second anti-reflection film layer is disposed between the red color resist of the color resist layer and the substrate, and the second anti-reflection film layer and the red color resist have the same area.

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