Quantum dot composite membrane, backlight module and display device

Abstract

The embodiment of the utility model provides a quantum dot composite membrane, a backlight module and a display device. The quantum dot composite film comprises a first base material layer, a quantum dot film layer and a first prism structure layer which are sequentially arranged in a stacked mode, and the quantum dot film layer comprises a base body and quantum dots dispersed in the base body. According to the quantum dot composite membrane, the quantum dot membrane layer is arranged between the first base material layer and the first prism structure layer, so that the quantum dot membrane layer can be protected by using the first base material layer and the first prism structure layer, water and oxygen are prevented from permeating or the water and oxygen permeability is reduced; the quantum dot composite film integrates the functions of a quantum dot film and a brightness enhancement film, integration of quantum dot light conversion and optical brightness enhancement is achieved, the thickness of the quantum dot composite film is small, light and thin display products can be achieved easily, a water and oxygen barrier film does not need to be arranged in the quantum dot composite film independently, and therefore the quantum dot composite film is convenient to use. Therefore, the production cost of the quantum dot composite membrane can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical film, in particular to a quantum dot composite film, a backlight module and a display device. BACKGROUND

[0002] Quantum dots (QDs) have the characteristics of adjustable light spectrum, narrow half-peak width, high light-emitting efficiency, etc., so that the display color gamut of liquid crystal displays can be greatly improved. At the same time, due to the small size of quantum dots, only nanometer level, it can be mixed more uniformly and not easy to settle in glue, so the application of quantum dots in liquid crystal displays can achieve better color uniformity and higher color gamut. At present, quantum dots are widely used in high-end backlights of liquid crystal displays, but the main application of quantum dots is to make quantum dot films (QD film).

[0003] Because quantum dot materials are easily oxidized by water vapor and oxygen, and thus fail, in the design of quantum dot films, water and oxygen barrier films need to be set on both sides of the quantum dot layer to prevent the penetration of water vapor and oxygen. Due to the complex structure of the water and oxygen barrier film, the production process is more, which leads to the higher cost of the water and oxygen barrier film, and further leads to the higher production cost of the quantum dot film. CONTENT OF THE INVENTION

[0004] Based on this, the present application provides a quantum dot composite film, a backlight module and a display device.

[0005] In the first aspect, the present application provides a quantum dot composite film, comprising a first substrate layer, a quantum dot film layer and a first prism structure layer which are sequentially stacked, wherein the quantum dot film layer comprises a matrix and quantum dots dispersed in the matrix.

[0006] In some embodiments, the quantum dots comprise a light-emitting core, a shell layer coated on the outer surface of the light-emitting core, and a barrier layer coated on the outer surface of the shell layer.

[0007] In some embodiments, the material of the light-emitting core is CdSe, the material of the shell layer is CdS or ZnS, and the material of the barrier layer is metal oxide; and / or,

[0008] The thickness of the shell layer is 3nm-15nm; and / or,

[0009] The thickness of the barrier layer is 2nm-30nm.

[0010] In some embodiments, the material of the matrix is UV curing glue; and / or,

[0011] The material of the first prism structure layer is UV curing glue; and / or,

[0012] the first substrate layer is made of a thermoplastic resin; and / or,

[0013] the thickness of the quantum dot film layer is 10 μm-100 μm.

[0014] In some embodiments, the quantum dot composite film sheet further comprises a diffusion film, which is arranged on the side of the first prism structure layer away from the quantum dot film layer.

[0015] In some embodiments, the quantum dot composite film sheet further comprises a first prism film, which is arranged between the diffusion film and the first prism structure layer, the first prism film comprising a second substrate layer and a second prism structure layer, the second substrate layer being arranged close to the first prism structure layer, and the second prism structure layer being arranged close to the diffusion film.

[0016] In some embodiments, the quantum dot composite film sheet further comprises a second prism film, which is arranged on the side of the first prism structure layer away from the quantum dot film layer, the second prism film comprising a third substrate layer and a third prism structure layer arranged in a stack, wherein the third substrate layer is arranged close to the first prism structure layer, and the third substrate layer and the third prism structure layer both contain diffusion particles.

[0017] In some embodiments, the quantum dot composite film sheet further comprises a first diffusion layer, a vertical prism layer, a horizontal prism layer and a second diffusion layer arranged in a stack on the first prism structure layer, wherein the vertical prism layer comprises a fourth substrate layer and a fourth prism structure layer arranged in a stack on the first diffusion layer, the horizontal prism layer comprises a fifth substrate layer and a fifth prism structure layer arranged in a stack on the vertical prism layer, and the fourth prism structure in the fourth prism structure layer and the fifth prism structure in the fifth prism structure layer are perpendicular to each other in the direction of extension.

[0018] In a second aspect, the embodiments of the present application provide a backlight module comprising the quantum dot composite film sheet as described above.

[0019] In a third aspect, the embodiments of the present application provide a display device comprising the backlight module as described above.

[0020] The quantum dot composite film provided by the embodiment of the present application is provided by arranging the quantum dot film layer between the first substrate layer and the first prism structure layer, so that the first substrate layer and the first prism structure layer can protect the quantum dot film layer, prevent water and oxygen from penetrating or reduce the penetration rate of water and oxygen. Since the quantum dot film layer can improve the color purity and color gamut of the outgoing light, and the first prism structure layer can play a light condensing function to achieve the effect of brightening, the quantum dot composite film of the embodiment of the present application combines the functions of the quantum dot film and the brightening film, realizes the integration of quantum dot light conversion and optical brightening, and the thickness of the quantum dot composite film is relatively thin, which is beneficial to realize the lightness and thinness of the display product. In addition, the quantum dot composite film does not need to separately arrange a water and oxygen barrier film, so that the production cost of the quantum dot composite film can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced.

[0022] Figure 1 The first structure diagram of the quantum dot composite film provided by the embodiment of the present application.

[0023] Figure 2 The structure diagram of the quantum dot provided by the embodiment of the present application.

[0024] Figure 3 The second structure diagram of the quantum dot composite film provided by the embodiment of the present application.

[0025] Figure 4 The third structure diagram of the quantum dot composite film provided by the embodiment of the present application.

[0026] Figure 5 The fourth structure diagram of the quantum dot composite film provided by the embodiment of the present application.

[0027] Figure 6 The fifth structure diagram of the quantum dot composite film provided by the embodiment of the present application.

[0028] Element symbol explanation:

[0029] 100, quantum dot composite film; 11, first substrate layer; 12, quantum dot film layer; 13, first prism structure layer; 131, first prism structure; 20, diffusion film; 30, first prism film; 31, second substrate layer; 32, second prism structure layer; 40, second prism film; 41, third substrate layer; 42, third prism structure layer; 51, first diffusion layer; 60, vertical prism layer; 61, fourth substrate layer; 62, fourth prism structure layer; 70, horizontal prism layer; 71, fifth substrate layer; 72, fifth prism structure layer; 721, fifth prism structure; 52, second diffusion layer; 80, quantum dot; 81, light emitting core; 82, shell layer; 83, barrier layer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The terms “first”, “second” are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of “multiple” is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0033] In the present application, unless specifically and expressly defined otherwise, a first feature is "on", "over", or "above" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact with an intervening medium. Also, a first feature "over", "above", and "on top of" a second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below", and "underneath" a second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0034] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0035] Please refer to Figure 1 and Figure 2 The embodiment of the present application provides a quantum dot composite film sheet 100, which comprises a first substrate layer 11, a quantum dot film layer 12 and a first prism structure layer 13 arranged in sequence, wherein the quantum dot film layer 12 comprises a matrix and quantum dots 80 dispersed in the matrix.

[0036] The quantum dot composite film sheet 100 provided by the embodiment of the present application can utilize the first substrate layer 11 and the first prism structure layer 13 to protect the quantum dot film layer 12, prevent water and oxygen from penetrating or reduce the penetration rate of water and oxygen, because the quantum dot film layer 12 can improve the color purity and color gamut of the outgoing light, and the first prism structure layer 13 can play a light condensing function to realize the effect of brightening. Therefore, the quantum dot composite film sheet 100 of the embodiment of the present application combines the functions of the quantum dot film sheet and the brightening film, realizes the integration of quantum dot light conversion and optical brightening, and the thickness of the quantum dot composite film sheet 100 is relatively thin, which is beneficial to realize the light and thin of the display product. In addition, the quantum dot composite film sheet 100 does not need to separately arrange a water and oxygen barrier film, so that the production cost of the quantum dot composite film sheet 100 can be reduced.

[0037] Please refer to Figure 1The first prism structure layer 13 includes a plurality of first prism structures 131 that are parallel to each other, and the cross section of the first prism structure 131 is triangular or trapezoidal.

[0038] Please refer to Figure 2 In some embodiments, the quantum dot 80 includes a light-emitting core 81, a shell layer 82 covering the outer surface of the light-emitting core 81, and a barrier layer 83 covering the outer surface of the shell layer 82.

[0039] It can be understood that the quantum dot 80 is a core-shell structure quantum dot, and the shell layer 82 in the core-shell structure quantum dot can effectively protect the light-emitting core 81, thereby prolonging the service life of the light-emitting core 81. In order to solve the problem that the shell layer 82 of the quantum dot is easy to be oxidized, the application further coats a barrier layer 83 outside the shell layer 82 to block the penetration of water and oxygen.

[0040] Exemplarily, the material of the light-emitting core 81 is CdSe, the material of the shell layer 82 is CdS or ZnS, and the material of the barrier layer 83 is metal oxide. Exemplarily, the metal oxide can be silicon oxide or aluminum oxide, etc. Exemplarily, the barrier layer 83 can include one or more layers of dense metal oxide.

[0041] Exemplarily, the thickness of the shell layer 82 is 3nm-15nm, such as 3nm, 5nm, 8nm, 10nm, 13nm, 15nm, etc.

[0042] Exemplarily, the thickness of the barrier layer 83 is 2nm-30nm, such as 2nm, 5nm, 7nm, 10nm, 12nm, 15nm, 17nm, 20nm, 22nm, 25nm, 27nm, 30nm, etc.

[0043] Exemplarily, the material of the substrate is UV curing glue.

[0044] Exemplarily, the preparation method of the quantum dot film layer 12 can be: coating quantum dot glue on the first substrate layer 11 by a slot coating process, and then curing the quantum dot glue by UV irradiation to obtain the quantum dot film layer 12.

[0045] Exemplarily, the UV curing glue used by the substrate has a water vapor barrier rate ≤5g / (24h*m2), which has a good protective effect on the quantum dot material.

[0046] Exemplarily, the material of the first prism structure layer 13 is UV curing glue.

[0047] Exemplarily, the preparation method of the first prism structure layer 13 can be: applying UV optical glue on the quantum dot film layer 12 to obtain a glue layer, transferring a prism structure pattern on the glue layer by using a mold with microstructure, and then curing the glue layer by using UV irradiation to obtain the first prism structure layer 13.

[0048] Exemplarily, the material of the first substrate layer 11 is thermoplastic resin, for example, polyethylene terephthalate (PET).

[0049] Exemplarily, the thickness of the quantum dot film layer 12 is 10 μm to 100 μm, for example, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, etc.

[0050] Please refer to Figure 3 In some embodiments, the quantum dot composite film sheet 100 further comprises a diffusion film 20, which is arranged on the side of the first prism structure layer 13 away from the quantum dot film layer 12.

[0051] It can be understood that by arranging the diffusion film 20 above the first prism structure layer 13, the light diffusion function of the diffusion film 20 can be utilized to improve the light uniformity of the quantum dot composite film sheet 100, and at the same time, the product viewing angle can be enlarged.

[0052] Exemplarily, the diffusion film 20 contains diffusion particles, and / or the side surface of the diffusion film 20 towards the first prism structure layer 13 is provided with microstructure, which can be concave structure or convex structure. It can be understood that the diffusion particles and the microstructure can both play a role in diverging light.

[0053] Exemplarily, the diffusion particles are inorganic diffusion particles or organic diffusion particles, wherein the material of the inorganic diffusion particles is barium sulfate, calcium carbonate, silicon dioxide or titanium dioxide, and the material of the organic diffusion particles is styrene resin or acrylic resin.

[0054] Please refer to Figure 3 and Figure 4 It can be seen that Figure 4 the structure shown in Figure 3 The difference between the structure shown in Figure 4As shown, the quantum dot composite film sheet 100 can further include a first prism film 30 disposed between the diffusion film 20 and the first prism structure layer 13, the first prism film 30 including a second base material layer 31 disposed proximate to the first prism structure layer 13 and a second prism structure layer 32 disposed proximate to the diffusion film 20.

[0055] It can be understood that by disposing the first prism film 30 between the diffusion film 20 and the first prism structure layer 13, the light condensing function of the second prism structure layer 32 in the first prism film 30 can be utilized, thereby further improving the light brightness of the quantum dot composite film sheet 100.

[0056] Exemplarily, the second prism structure layer 32 includes a plurality of second prism structures parallel to each other, the cross section of the second prism structure being triangular or trapezoidal.

[0057] Exemplarily, the second prism structures in the second prism structure layer 32 are perpendicular to the extension direction of the first prism structures 131 in the first prism structure layer 13.

[0058] Referring to Figure 5 In some embodiments, the quantum dot composite film sheet 100 can further include a second prism film 40 disposed on a side of the first prism structure layer 13 away from the quantum dot film layer 12, the second prism film 40 including a third base material layer 41 and a third prism structure layer 42 stacked, wherein the third base material layer 41 is disposed proximate to the first prism structure layer 13, and the third base material layer 41 and the third prism structure layer 42 both contain diffusion particles.

[0059] It can be understood that by disposing the second prism film 40 above the first prism structure layer 13, on the one hand, the light condensing function of the third prism structure layer 42 in the second prism film 40 can be utilized to improve the light brightness of the quantum dot composite film sheet 100, and on the other hand, since the third base material layer 41 and the third prism structure layer 42 both contain diffusion particles, the diffusion particles can appropriately diffuse the light emitted from the quantum dot composite film sheet 100, thereby improving the uniformity of the emitted light and expanding the product viewing angle.

[0060] Exemplarily, the diffusion particles are inorganic diffusion particles or organic diffusion particles, wherein the material of the inorganic diffusion particles is barium sulfate, calcium carbonate, silicon dioxide or titanium dioxide, and the material of the organic diffusion particles is styrene resin or acrylic resin.

[0061] Exemplarily, the third prismatic structure layer 42 comprises a plurality of third prismatic structures which are parallel to each other, and the cross section of the third prismatic structure is triangular or trapezoidal.

[0062] Exemplarily, the third prismatic structure in the third prismatic structure layer 42 is perpendicular to the extending direction of the first prismatic structure 131 in the first prismatic structure layer 13.

[0063] Please refer to Figure 6 In some embodiments, the quantum dot composite film 100 can further comprise a first diffusion layer 51, a vertical prism layer 60, a horizontal prism layer 70 and a second diffusion layer 52 which are sequentially stacked on the first prismatic structure layer 13, wherein the vertical prism layer 60 comprises a fourth base material layer 61 and a fourth prismatic structure layer 62 which are sequentially stacked on the first diffusion layer 51, the horizontal prism layer 70 comprises a fifth base material layer 71 and a fifth prismatic structure layer 721 which are sequentially stacked on the vertical prism layer 60, and the fourth prismatic structure in the fourth prismatic structure layer 62 is perpendicular to the extending direction of the fifth prismatic structure 721 in the fifth prismatic structure layer 721.

[0064] It can be understood that, by sequentially stacking the first diffusion layer 51, the vertical prism layer 60, the horizontal prism layer 70 and the second diffusion layer 52 on the first prismatic structure layer 13, the light diffusion function of the first diffusion layer 51 and the second diffusion layer 52 can be utilized to improve the light uniformity of the quantum dot composite film 100, and at the same time, the product viewing angle can be enlarged; the light condensing function of the vertical prism layer 60 and the horizontal prism layer 70 can be utilized to improve the light brightness of the quantum dot composite film 100; since the prismatic structures of the vertical prism layer 60 and the horizontal prism layer 70 are perpendicular to each other, the light can be more effectively concentrated, and thus the light brightness of the quantum dot composite film 100 can be greatly improved.

[0065] It can be understood that the first diffusion layer 51, the vertical prism layer 60, the horizontal prism layer 70 and the second diffusion layer 52 are sequentially stacked in the direction from the first base material layer 11 to the first prismatic structure layer 13.

[0066] Exemplarily, the fourth prismatic structure layer 62 comprises a plurality of fourth prismatic structures which are parallel to each other, and the cross section of the fourth prismatic structure is triangular or trapezoidal.

[0067] Exemplarily, the fifth prismatic structure layer 721 comprises a plurality of fifth prismatic structures 721 which are parallel to each other, and the cross section of the fifth prismatic structure 721 is triangular or trapezoidal.

[0068] Exemplarily, the fourth prismatic structure in the fourth prismatic structure layer 62 is perpendicular to the extending direction of the first prismatic structure 131 in the first prismatic structure layer 13.

[0069] The embodiment of the present application further provides a backlight module comprising the quantum dot composite film 100 in any of the above embodiments.

[0070] Exemplarily, the backlight module can be a side-in backlight module or a direct type backlight module.

[0071] When the backlight module is a side-in backlight module, the backlight module further comprises a light guide plate and a light source arranged at the side of the light guide plate, and at this time, the quantum dot composite film 100 is arranged at the light-out side of the light guide plate.

[0072] When the backlight module is a direct type backlight module, the backlight module further comprises a diffusion plate and a light source arranged below the diffusion plate, and at this time, the quantum dot composite film 100 is arranged at the light-out side (i.e. the side away from the light source) of the diffusion plate.

[0073] The embodiment of the present application further provides a display device comprising the backlight module in any of the above embodiments.

[0074] Exemplarily, the display device further comprises a display panel, and the backlight module is arranged at the light-in side of the display panel. Exemplarily, the display panel is a liquid crystal display panel.

[0075] The quantum dot composite film, the backlight module and the display device provided by the embodiment of the present application are described in detail above. The principle and implementation mode of the present application are described by applying specific examples in this paper, and the above embodiment is only used to help understand the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range can be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A quantum dot composite film sheet, characterized by, The quantum dot composite film sheet comprises a first substrate layer, a quantum dot film layer and a first prism structure layer which are sequentially stacked, wherein the quantum dot film layer comprises a matrix and quantum dots dispersed in the matrix, the quantum dot film layer is connected to the first substrate layer by adhesion, and the first prism structure layer is connected to the quantum dot film layer by adhesion.

2. The quantum dot composite film of claim 1, wherein, The quantum dot comprises a light-emitting core, a shell layer covering the outer surface of the light-emitting core, and a barrier layer covering the outer surface of the shell layer.

3. The quantum dot composite film of claim 2, wherein, The material of the light-emitting core is CdSe, the material of the shell layer is CdS or ZnS, and the material of the barrier layer is metal oxide; and / or The thickness of the shell layer is 3-15 nm; and / or The thickness of the barrier layer is 2-30 nm.

4. The quantum dot composite film of claim 1, wherein, The material of the matrix is UV curing adhesive; and / or The material of the first prism structure layer is UV curing adhesive; and / or The material of the first substrate layer is thermoplastic resin; and / or The thickness of the quantum dot film layer is 10-100 μm.

5. The quantum dot composite film of any of claims 1-4, wherein, The quantum dot composite film sheet further comprises a diffusion film arranged on the side of the first prism structure layer away from the quantum dot film layer.

6. The quantum dot composite film of claim 5, wherein, The quantum dot composite film sheet further comprises a first prism film arranged between the diffusion film and the first prism structure layer, the first prism film comprising a second substrate layer and a second prism structure layer, the second substrate layer being arranged close to the first prism structure layer, and the second prism structure layer being arranged close to the diffusion film.

7. The quantum dot composite film of any of claims 1-4, wherein the quantum dots are CdSe / ZnS quantum dots. The quantum dot composite film sheet further comprises a second prism film arranged on the side of the first prism structure layer away from the quantum dot film layer, the second prism film comprising a third substrate layer and a third prism structure layer which are sequentially stacked, wherein the third substrate layer is arranged close to the first prism structure layer, and the third substrate layer and the third prism structure layer both contain diffusion particles.

8. The quantum dot composite film of any of claims 1-4, wherein, The quantum dot composite film sheet further comprises a first diffusion layer, a vertical prism layer, a horizontal prism layer and a second diffusion layer which are sequentially stacked on the first prism structure layer, wherein the vertical prism layer comprises a fourth substrate layer and a fourth prism structure layer which are sequentially stacked on the first diffusion layer, the horizontal prism layer comprises a fifth substrate layer and a fifth prism structure layer which are sequentially stacked on the vertical prism layer, and the fourth prism structure in the fourth prism structure layer and the fifth prism structure in the fifth prism structure layer are perpendicular to each other in the extending direction.

9. A backlight module, characterized in that, The quantum dot composite film sheet of any one of claims 1-8.

10. A display device, characterized by comprising: The backlight module of claim 9.

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