Patent Publication Number: US-2023155076-A1

Title: Quantum dot film, manufacturing method thereof, and display panel

Description:
BACKGROUND OF INVENTION 
     Field of Invention 
     The present disclosure relates to the field of display technology and particularly to a quantum dot film, a manufacturing method thereof, and a display panel. 
     Description of Prior Art 
     With development of display technology and consumers&#39; higher requirements for product display quality, high color gamut display products are becoming more and more favored by consumers. There are many ways to realize high color gamut, which mainly include using light emitting diode (LED) chips, fluorescent powders, or integration of quantum dots (QDs) with different components, such as QD-LED, etc. A basic principle thereof is to make a half-peak width of a spectrum of backlights narrow to improve color purity, so the color gamut is improved. Wherein, using quantum dot films (QD film) is a main implementation solution of most current high color gamut liquid crystal display (LCD) devices. 
     However, regarding display products using LEDs as light sources, because a light shape of the LED is a Lambertian type, a light intensity at middle angles is strong, and light at large angles is weak. Furthermore, light at the middle angles directly passes through the quantum dot film with short optical paths and little excitation, and the light at the large angles passes through the quantum dot film with long optical paths and great excitation. Therefore, this causes light extractions of the light at the middle angles and the large angles after passing through the quantum dot film to be different, and a phenomenon of uneven display appears. 
     Therefore, a technical problem of uneven display existing in current display products needs to be solved. 
     SUMMARY OF INVENTION 
     The present disclosure provides a quantum dot film, a manufacturing method thereof, and a display panel to ease the technical problem of uneven display existing on current display products. 
     In order to solve the problems mentioned above, the present disclosure provides the technical solutions as follows: 
     One embodiment of the present disclosure provides a quantum dot film divided into a plurality of quantum dot regions. The quantum dot film includes: 
     quantum dot layers, wherein quantum dots are disposed on the quantum dot layers; and 
     a first protective layer and a second protective layer disposed on two opposite sides of the quantum dot layers, 
     wherein the quantum dot layers of each of the quantum dot regions have height differences to reduce optical path differences between lights of different incident angles passing through the quantum dot layer. 
     In the quantum dot film provided by one embodiment of the present disclosure, the quantum dot layers of the quantum dot regions have protruding structures. 
     In the quantum dot film provided by one embodiment of the present disclosure, first grooves are defined on one of the first protective layer or the second protective layer corresponding to the quantum dot regions, the protruding structures are filled in the first grooves. 
     In the quantum dot film provided by one embodiment of the present disclosure, the second grooves and third grooves are defined where the first protective layer and the second protective layer correspond to the quantum dot regions, and the protruding structures are filled in the second grooves and the third grooves. 
     In the quantum dot film provided by one embodiment of the present disclosure, the second grooves are defined opposite to the third grooves. 
     In the quantum dot film provided by one embodiment of the present disclosure, a sum of a depth of the second grooves and a depth of the third grooves is equal to a separation distance between the first protective layer and the second protective layer. 
     In the quantum dot film provided by one embodiment of the present disclosure, the depth of the second grooves is equal to the depth of the third grooves. 
     In the quantum dot film provided by one embodiment of the present disclosure, a gap is formed between one of the first protective layer or the second protective layer and a part of the quantum dot layers in the quantum dot regions. 
     In the quantum dot film provided by one embodiment of the present disclosure, a shape of a cross section of the protruding structures includes rectangular, arc, triangular, or trapezoidal. 
     In the quantum dot film provided by one embodiment of the present disclosure, the quantum dots of different quantum dot regions are same, and the quantum dots include red quantum dots and green quantum dots. 
     In the quantum dot film provided by one embodiment of the present disclosure, a particle size of the red quantum dots is greater than a particle size of the green quantum dots. 
     In the quantum dot film provided by one embodiment of the present disclosure, concentrations of the quantum dots are in positive correlation with heights of the quantum dot layers. 
     In the quantum dot film provided by one embodiment of the present disclosure, the quantum dot film further includes black matrices, the quantum dot layers are divided into the plurality of quantum dot regions by the black matrices, and the quantum dots in each two adjacent quantum dot regions are different. 
     One embodiment of the present disclosure further provides a display panel, including a quantum dot film and a plurality of excited light sources, wherein each quantum dot region corresponds to one of the excited light sources, the quantum dot film is divided into a plurality of quantum dot regions, and the quantum dot film includes: 
     quantum dot layers, wherein quantum dots are disposed on the quantum dot layers; and 
     a first protective layer and a second protective layer disposed on two opposite sides of the quantum dot layers, 
     wherein the quantum dot layers of each of the quantum dot regions have height differences to reduce optical path differences between lights of different incident angles passing through the quantum dot layers. 
     In the display panel provided by one embodiment of the present disclosure, the quantum dot layers of the quantum dot regions have protruding structures. 
     In the display panel provided by one embodiment of the present disclosure, a shape of a cross section of the protruding structures includes rectangular, arc, triangular, or trapezoidal. 
     In the display panel provided by one embodiment of the present disclosure, the excited light sources are blue light emitting diodes (LEDs). 
     One embodiment of the present disclosure further provides a manufacturing method of a quantum dot film, including: 
     manufacturing a first protective layer, wherein manufacturing the first protective layer includes providing a base material layer and manufacturing a barrier layer on the base material layer to form the first protective layer; 
     patterning the first protective layer to form first grooves; 
     manufacturing quantum dot layers, wherein manufacturing the quantum dot layers includes manufacturing the quantum dot layers on the first protective layer and the first grooves to make the quantum dot layers form the protruding structures; and 
     manufacturing a second protective layer on the quantum dot layers to form the quantum dot film. 
     In the manufacturing method of the quantum dot film provided by one embodiment of the present disclosure, the step of manufacturing the quantum dot layers on the first protective layer and the first groove to make the quantum dot layers form the protruding structures includes: 
     dispersing the quantum dots in a macromolecule polymer solution to form a quantum dot glue solution; 
     spraying the quantum dot glue solution on the first protective layer and the first grooves by a spraying process; and 
     performing a pre-curing process on the sprayed quantum dot glue solution to form the quantum dot layers. 
     In the manufacturing method of the quantum dot film provided by one embodiment of the present disclosure, ultraviolet light irradiation, heating, evaporating solvents, or adding curing agent is adopted in the pre-curing process. 
     In the quantum dot film, the manufacturing method thereof, and the display panel provided by the present disclosure, the quantum dot film is divided into the plurality of quantum dot regions, and the quantum dot film includes the quantum dot layers and the first protective layer and the second protective layer disposed on two opposite sides of the quantum dot layers; the grooves are defined on the first protective layer and/or the second protective layer corresponding to each quantum dot region; and the quantum dot layers are filled in the grooves to form the protruding structures. Therefore, the quantum dot layers of each quantum dot region are made to have height differences to reduce optical path differences of different lights at different angles passing through the quantum dot layers, and extents of the lights at different angles passing through the quantum dot layers are excited similarly, which prevents appearance of uneven display. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate embodiments or the technical solutions of the present disclosure, the accompanying figures of the present disclosure required for illustrating embodiments or the technical solutions of the present disclosure will be described in brief. Obviously, the accompanying figures described below are only part of the embodiments of the present disclosure, from which those skilled in the art can derive further figures without making any inventive efforts. 
         FIG.  1    is a schematic diagram of a cross-sectional structure of a quantum dot film provided by one embodiment of the present disclosure. 
         FIG.  2    is a schematic diagram of details of protective layers provided by one embodiment of the present disclosure. 
         FIG.  3    is a schematic diagram of contrasting relations of quantum dot regions and excited light sources provided by one embodiment of the present disclosure. 
         FIG.  4    is a schematic diagram of a principle of implementation of reducing optical path difference provided by one embodiment of the present disclosure. 
         FIG.  5    is a schematic diagram of another cross-sectional structure of the quantum dot film provided by one embodiment of the present disclosure. 
         FIG.  6    is a schematic diagram of yet another cross-sectional structure of the quantum dot film provided by one embodiment of the present disclosure. 
         FIG.  7    is a schematic diagram of still another cross-sectional structure of the quantum dot film provided by one embodiment of the present disclosure. 
         FIG.  8    is a schematic diagram of a cross-sectional structure of a display panel provided by one embodiment of the present disclosure. 
         FIG.  9    is a schematic diagram of another cross-sectional structure of the display panel provided by one embodiment of the present disclosure. 
         FIG.  10    is a flowchart of a manufacturing method of the quantum dot film provided by one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     The descriptions of embodiments below refer to accompanying drawings in order to illustrate certain embodiments which the present disclosure can implement. The directional terms of which the present disclosure mentions, for example, “top”, “bottom”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “inside”, “outside”, “side”, etc., only refer to directions of the accompanying figures. Therefore, the used directional terms are for illustrating and understanding the present disclosure, but not for limiting the present disclosure. In the figures, units with similar structures are used same labels to indicate. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. The dimensions and thickness of each component shown in the accompanying figures are arbitrarily shown, present disclosure is not limited thereto. 
     Please refer to  FIG.  1   .  FIG.  1    is a schematic diagram of a cross-sectional structure of a quantum dot film provided by one embodiment of the present disclosure. The quantum dot film  100  is divided into a plurality of quantum dot regions LD. The quantum dot film  100  includes quantum dot layers  10  and a first protective layer  20  and a second protective layer  30  disposed on two opposite sides of the quantum dot layer  10 . Quantum dots  12  are disposed on the quantum dot layers  10 . Wherein, the quantum dot layers  10  of each of the quantum dot regions LD have height differences to reduce optical path differences between lights of different incident angles passing through the quantum dot layers  10 . 
     In this embodiment, the quantum dot layers  10  of each quantum dot region LD have height differences to reduce optical path differences of different lights at different angles passing through the quantum dot layers  10  to make levels of the lights at different angles passing through the quantum dot layers  10  be excited similarly, which prevents occurrences of uneven display. 
     Specifically, please continue referring to  FIG.  1   . A middle layer of the quantum dot film  100  is the quantum dot layers  10 . The quantum dot layers  10  include a macromolecule polymer base material  11  and the quantum dots  12  uniformly dispersed in the macromolecule polymer base material  11 . 
     The quantum dots  12  are core-shell structures constituted by a semiconductor material and include quantum-dot central cores and outer shells. Materials of the quantum dots  12  include one or more of magnesium sulfide (MgS), cadmium telluride (CdTe), cadmium selenide (CdSe), cadmium sulfide (CdS), cadmium zinc sulfide (CdZnS), zinc selenide (ZnSe), zinc telluride (ZnTe), zinc sulfide (ZnS), zinc oxide (ZnO), gallium arsenide (GaAs), gallium nitride (GaN), gallium phosphide (GaP), indium phosphide (InP), indium arsenide (InAs), indium nitride (InN), indium antimonide (InSb), aluminium phosphide (AlP), or aluminium antimonide (AlSb), etc. For example, the central core is a CdSe core, and the outer shell is a ZnS shell. Particle sizes of the quantum dots  12  are generally about 10 nanometers. Due to difference in sizes of the quantum dots, wavelengths of emitted lights from the quantum dots  12  vary with the particle sizes and compositions. 
     Furthermore, as a photoluminescent material, the quantum dots  12  can convert absorbed lights with short wavelength into light with long wavelength. In order to obtain the quantum dot film  100  of a predetermined color, the quantum dots  12  in the quantum layers may include one type or more types. For example, in one embodiment of the present disclosure, in order to obtain white light, the quantum dots  12  of the quantum dot layers  10  include red quantum dots  121  and green quantum dots  122 , particle sizes of the green quantum dots  122  are smaller, and particle sizes of the red quantum dots  121  are larger. The red quantum dots  121  are excited by light to emit red light, and the green quantum dots  122  are excited by light to emit green light. At the same time, blue light is used as excitation light sources, such as blue light emitting diodes (LEDs), etc. The blue light emitted from the blue light sources is converted into red light and green light by the quantum dot film  100 , and the red light, green light, and blue light are mixed to obtain white light. 
     Of course, the quantum dots  12  of the present disclosure are not limited to the quantum dots that emit red light and green light, and quantum dots that emit any wavelength within a visible light wavelength range are further included. Specifically, they can be configured according to a quantum dot film  100  of a predetermined color that needs to be obtained. 
     The quantum dots  12  are uniformly dispersed in the macromolecule polymer base material  11 . Specifically, the quantum dot layers  10  can be formed by uniformly dispersing the quantum dots  12  in a macromolecule polymer solution and then curing. The macromolecule polymer solution is formed by doping macromolecule polymer in an organic solvent. The macromolecule polymer includes one or more of macromolecule polymers such as silicone resin, epoxy resin, polyacrylamide, acrylic resin, photocuring resin, heat curing resin, etc. For example, the macromolecule polymer base material  11  can be polyethylene terephthalate (PET) or triacetate cellulose (TAC), etc. 
     Furthermore, the first protective layer  20  and the second protective layer  30  are disposed on two opposite sides of the quantum dot layers  10 . Optionally, the first protective layer  20  is disposed on a lower surface of the quantum dot layer  10 , and the second protective layer  30  is disposed on an upper surface of the quantum dot layer  10 . Wherein, the upper surface of the quantum dot layer  10  refers to a light exiting surface of the quantum dot layer  10 , and the lower surface of the quantum dot layer  10  refers to a light incident surface of the quantum dot layer  10 , i.e., a surface illuminated by the excitation light sources. The first protective layer  20  and the second protective layer  30  are configured to protect stability of structures of the quantum dot layers  10  and can prevent failure of the quantum dots  12  incurred by intrusion of water and oxygen into the quantum dot layer  10  at the same time. 
     Optionally, please refer to  FIG.  2   .  FIG.  2    is a schematic diagram of details of protective layers provided by one embodiment of the present disclosure. The first protective layer  20  and the second protective layer  30  both include a base material layer  31 , a barrier layer  32 , etc., which are laminated. The barrier layer  32  is disposed on one side of the base material layer  31  away from the quantum dot layers  10 . The base material layer  31  can be polyethylene terephthalate, etc., and inorganic materials with strong water and oxygen barrier ability can be adopted for the barrier layer  32 . The dense arrangement of the inorganic materials at the atomic level can effectively block moisture and oxygen. For example, the inorganic material includes at least one of aluminum nitride, aluminum oxynitride, titanium nitride, titanium oxynitride, zirconium nitride, zirconium oxynitride, silicon oxide, silicon nitride, silicon oxynitride, graphene, etc. 
     Of course, the first protective layer  20  and the second protective layer  30  can further include a diffusion layer  33  disposed on one side of the barrier layer  32  away from the base material layer  31  to improve uniformity of the light. 
     The first protective layer  20 , the second protective layer  30 , and the quantum dot layers  10  together form the quantum dot film  100 . The quantum dot film  100  is divided into the plurality of quantum dot regions LD. The quantum dots  12  disposed on the quantum dot layers  10  in different quantum dot regions LD are same. For example, the red quantum dots  121  and the green quantum dots  122  are disposed on the quantum dot layers  10 . Therefore, after the light of the excited light sources passes through the quantum dot film  100 , outgoing lights of each quantum dot region LD are white lights. Optionally, please refer to  FIG.  3   .  FIG.  3    is a schematic diagram of contrasting relations of the quantum dot regions and the excited light sources provided by one embodiment of the present disclosure. Each of the quantum dot regions LD corresponds to one excited light source  40 . For example, one quantum dot region LD corresponds to one blue light LED chip. 
     Furthermore, the quantum dot layers  10  of each of the quantum dot regions LD have height differences. The height differences can be formed by disposing protruding structures  13  on the corresponding quantum dot layers  10 . By disposing the quantum dot layers  10  having the height differences, optical path differences of the lights passing through the quantum dot film  100  are reduced. 
     Formation of the protruding structures  13  and a principle of reducing the optical path differences of the light passing through the quantum dot film  100  will be described below by combining specific embodiments. 
     Specifically, the quantum dot layers  10  of the quantum dot regions LD have the protruding structures  13 . First grooves  21  are defined on one of the first protective layer  20  or the second protective layer  30 . The protruding structures  13  are filled in the first grooves  21 , i.e., the quantum dot layers  10  are filled in the first grooves  21  to form the protruding structures  13 . 
     Optionally, in each corresponding quantum dot region LD, the first grooves  21  are defined on the first protective layer  20 . A cross-sectional shape of the first grooves  21  is arc, and the present disclosure is not limited thereto. The cross-sectional shape of the first grooves  21  of the present disclosure further includes any one of rectangular, triangular, or trapezoidal, or one of other irregular shapes. In this embodiment, the cross-sectional shape being arc is used as an example for description. The quantum dot layers  10  are filled in the first grooves  21  to form the protruding structures  13 , and the cross-sectional shape of the protruding structures  13  is also arc. A radius of curvature of the arc gradually increases from the middle to the two sides. It can be understood that the quantum dot layers  10  are filled in the first grooves  21  to form the protruding structures  13 , and then the cross-sectional shape of the protruding structures  13  is same as the cross-sectional shape of the first grooves  21 . Furthermore, existence of the protruding structures  13  allows height differences to form between the quantum dot layers  10 , thereby reducing optical path differences of lights passing through the quantum dot layers  10 . 
     Specifically, please refer to  FIG.  3    and  FIG.  4   .  FIG.  4    is a schematic diagram of a principle of implementation of reducing the optical path difference provided by one embodiment of the present disclosure. In  FIG.  4   , one excited light source  40  is correspondingly disposed with each of the quantum dot regions LD. A middle section of the protruding structures  13  directly faces the excited light sources  40 . Optionally, a center line O-O′ of the protruding structures  13  overlaps a center line of the excited light sources  40 . Wherein, the middle section of the protruding structures  13  refers to a part of the protruding structures  13  located at a bottom of the first grooves  21 . A thickness of the quantum dot layers  10  corresponding to the part is thickest; i.e., from the middle section of protruding structures  13  to two sides of the protruding structure  13 , the thickness of the quantum dot layers  10  gradually decreases. 
     When the light emitted from the excited light sources  40  passes through the quantum dot layers  10 , due to the existence of the protruding structures  13 , the optical path differences of the light passing through the quantum dot layers  10  are similar or equal, i.e., the optical path differences of the light passing through the quantum dot layers  10  at different angles can be reduced. 
     Specifically, as illustrated in  FIG.  4   , two lights emitted from the excited light sources  40  are illustrated. A first light A is perpendicularly incident on the middle section of the protruding structures  13  of the quantum dot layers  10 , i.e., the first light A is incident on a region of the quantum dot layers with a thick thickness. A second light B is incident on an edge section of the protruding structures  13 , i.e., the second light B is incident on a region of the quantum dot layers  10  with a little thickness. Wherein, the second light B can be a light close to the excited light sources  40 . Therefore, an optical path  51  of the first light A passing through the quantum dot layers  10  is similar to or equal to an optical path S 2  of the second light B passing through the quantum dot layers  10 , which reduces the optical path difference of the first light A and the second light B passing through the quantum dot layers  10 . 
     Of course, the embodiments of the present disclosure only take reducing the optical path difference between the first light A and the second light B as an example to illustrate the effect of disposing the protruding structures  13  on the quantum dot layers  10 . While other lights between the first light A and the second light B change according to the thickness of the quantum dot layers  10 , the optical paths of these other lights passing through the quantum dot layers  10  are also similar to or equal to the optical paths of the first light A and the second light B passing through the quantum dot layers  10 . In this way, the optical paths of the lights emitted from the excited light sources  40  passing through the quantum dot layers  10  are similar or equal, so that levels of excitation by the quantum dots  12  are similar or same, thus allowing light extraction from the quantum dot film  100  at different viewing angles to be more uniform. 
     It should be noted that configurations of depths of the first grooves  21  and gradients of the first grooves  21  can be determined specifically according to an actual reduction range of the optical path difference to be achieved, a light extraction angle of the excited light sources  40 , a configured thickness of the quantum dot layer  10 , or other factors, etc. 
     In this embodiment, by disposing the arc-shaped first grooves  21  on the first protective layer  20  to make the quantum dot layers  10  form the arc-shaped protruding structures  13 , the optical paths of the lights emitted from the excited light sources  40  passing through the quantum dot layers  10  are similar or equal. Therefore, the optical path differences are reduced, and the phenomenon of appearance of uneven display is prevented. 
     In one embodiment, please refer to  FIG.  5   .  FIG.  5    is a schematic diagram of another cross-sectional structure of the quantum dot film provided by one embodiment of the present disclosure. The difference from the aforesaid embodiments is that the quantum dot film  101  includes the quantum dot layers  10  and the first protective layer  20  and the second protective layer  30  located on opposite sides of the quantum dot layers  10 ; in each quantum dot region LD, second grooves  22  and third grooves  23  are defined on the first protective layer  20  and the second protective layer  30 ; and the protruding structures  13  of the quantum dot layers  10  are filled in the second grooves  22  and the third grooves  23 , so that a difference in film thickness of the first protective layer  20  and the second protective layer  30  can be balanced. 
     Specifically, the second grooves  22  are defined opposite to the third grooves  23 . Optionally, projections of the second grooves  22  and the third grooves  23  overlap each other in a vertical direction. Cross-sectional shapes of the second grooves  22  and the third grooves  23  are rectangular. Of course, the present disclosure is not limited thereto. The cross-sectional shapes of the second grooves  22  and the third grooves  23  further include any one of arc, triangular, trapezoidal, etc., or one of other irregular shapes. In this embodiment, the cross-sectional shape being rectangular is used as an example for description. The quantum dot layers  10  are filled in the second grooves  22  and the third grooves  23  to respectively form the corresponding protruding structures  13 , and the cross-sectional shapes of the protruding structures  13  are also rectangular. It can be understood that the quantum dot layers  10  are filled in the second grooves  22  and the third grooves  23  to respectively form the protruding structures  13 , and then the cross-sectional shapes of the protruding structures  13  are same as the cross-sectional shapes of the second grooves  22  and the third grooves  23 . Furthermore, existence of the protruding structures  13  allows height differences to form between the quantum dot layers  10 , thereby reducing optical path differences of lights passing through the quantum dot layers  10 . 
     Furthermore, a sum of a depth of the second grooves  22  and a depth of the third grooves  23  is equal to a separation distance between the first protective layer  20  and the second protective layer  30 . Optionally, the depth of the second grooves  22  and the depth of the third grooves  23  are same. By defining grooves with same structures on the first protective layers  20  and the second protective layer  30 , same film thicknesses of layers can be configured on the first protective layer  20  and the second protective layer  30 . Therefore, the difference in the film thicknesses of the first protective layer  20  and the second protective layer  30  can be balanced, and the first protective layer  20  and the second protective layer  30 &#39;s effect of effectively blocking water and oxygen can be ensured, while an overall thickness of the quantum dot film  100  is minimized as much as possible. 
     In this embodiment, by defining the second grooves  22  and the third grooves  23 , two protruding structures  13  are formed on the quantum dot layers  10 . The existence of the protruding structures  13  makes height differences form on the upper sides and the lower sides of the quantum dot layers  10 . Therefore, the optical paths of the lights passing through the quantum dot layers  10  are similar or equal, so that levels of excitation by the quantum dots  12  are similar or same, thereby allowing light extraction from the quantum dot film  100  at different viewing angles to be more uniform. For other descriptions please refer to the above-mentioned embodiments, and redundant description will not be mentioned herein again. 
     In one embodiment, please refer to  FIG.  6   .  FIG.  6    is a schematic diagram of yet another cross-sectional structure of the quantum dot film provided by one embodiment of the present disclosure. The difference from the aforesaid embodiments is that a quantum dot film  102  includes the quantum dot layers  10  and the first protective layer  20  and the second protective layer  30  located on opposite sides of the quantum dot layers  10 ; in each quantum dot region LD, the quantum dot layers  10  have the protruding structures  13  to make height differences to form between the quantum dot layers  10 ; and there are gaps formed between the quantum dot layers  10  and the first protective layer  20  or the second protective layer  30 . That is, surfaces of the first protective layer  20  and the second protective layer  30  are flat, and no grooves are defined, and due to the existence of the protruding structures  13 , gaps are formed between the quantum dot layers  10  and the first protective layer  20  or the second protective layer  30 . 
     Specifically, as illustrated in  FIG.  6   , the gaps  34  are formed between the quantum dot layers  10  and the second protective layer  30 . Of course, in order to avoid failure of the quantum dots  12  of the quantum dot layers  10 , water and oxygen are not allowed in the gaps  34 . Therefore, when the second protective layer  30  is disposed on the quantum dot layers  10 , it needs to be performed under specific process conditions, for example, it can be performed in a vacuum-dried environment. 
     Furthermore, the cross-sectional shape of the protruding sections  13  is rectangular. Of course, the present disclosure is not limited thereto. The cross-sectional shape of the protruding structures  13  further includes any one of arc, triangular, trapezoidal, etc., or one of other irregular shapes. In this embodiment, the cross-sectional shape being rectangular is used as an example for description. Furthermore, existence of the protruding structures  13  allows height differences to form between the quantum dot layers  10 , thereby reducing optical path differences of lights passing through the quantum dot layers  10 , making levels of excitation by the quantum dots  12  similar or same. 
     Optionally, concentrations of the quantum dots  12  of the quantum dot layers  10  are different, and the concentrations of the quantum dots  12  are in positive correlation with heights of the quantum dot layers  10 . Wherein, the positive correlation means that the concentration of the quantum dots  12  increases as the heights of the quantum dot layers  10  increase. Specifically, the concentrations of the quantum dots  12  at the region corresponding to the quantum dot layers  10  where the protruding structures  13  are formed are relatively high; and the concentrations of the quantum dots  12  at the region corresponding to the quantum dot layers  10  where the protruding structures  13  are not formed are relatively low. Furthermore, the concentrations of the quantum dots  12  are related to how much light of other colors is generated by light passing through the quantum dot layers  10  and excited. Therefore, by configuring different concentrations of the quantum dots  12  in different regions, levels of excitation of the light passing through the quantum dot layers  10  can be further improved, and light extraction of the quantum dot film  100  can be more uniform at different viewing angles. 
     In this embodiment, by disposing the protruding structures  13  on the quantum dot layers  10 , height differences are formed between the quantum dot layers  10 . Therefore, the optical paths of the lights passing through the quantum dot layers  10  are similar or equal, so that levels of excitation by the quantum dots  12  are similar or same, thereby allowing light extraction from the quantum dot film  100  at different viewing angles to be more uniform. For other descriptions please refer to the above-mentioned embodiments, and redundant description will not be mentioned herein again. 
     In one embodiment, please refer to  FIG.  7   .  FIG.  7    is a schematic diagram of still another cross-sectional structure of the quantum dot film provided by one embodiment of the present disclosure. The difference from the aforesaid embodiments is that a quantum dot film  103  includes the quantum dot layers  10 , the first protective layer  20  and the second protective layer  30  located on opposite sides of the quantum dot layers  10 , and black matrices  50  dividing the quantum dot layers  10  into the plurality of quantum dot regions LD; the quantum dots  12  of every two adjacent quantum dot regions LD are different; and in each of the quantum dot regions LD, height differences are present between the quantum dot layers  10 . 
     Specifically, as illustrated in  FIG.  7   , in each the corresponding quantum dot region LD, first grooves  21  are defined on the first protection layer  20 , and a cross-sectional shape of the first grooves  21  is trapezoidal. Of course, the cross-sectional shape of the first grooves  21  of the present disclosure further includes any one of rectangular, triangular, or arc, or one of other irregular shapes. In this embodiment, the cross-sectional shape being trapezoidal is used as an example for description. The quantum dot layers  10  are filled in the first grooves to form the protruding structures  13 , and then the cross-sectional shape of the protruding structures  13  is also trapezoidal. It can be understood that the quantum dot layers  10  are filled in the first grooves  21  to form the protruding structures  13 , and then the cross-sectional shape of the protruding structures  13  is same as the cross-sectional shape of the first grooves  21 . Furthermore, existence of the protruding structures  13  allows height differences to form between the quantum dot layers  10 , thereby reducing optical path differences of lights passing through the quantum dot layers  10 . 
     Furthermore, the black matrices  50  divide the quantum dot layers  10  into the plurality of quantum dot regions LD; the quantum dots  12  of every two adjacent quantum dot regions LD are different; every three adjacent quantum dot regions LD compose one light extraction unit; and the plurality of light extraction units are arranged cyclically. For example, the quantum dots  12  of the first quantum dot region LD are red quantum dots  121 ; the quantum dots  12  of the second quantum dot region LD are green quantum dots  122 ; and the quantum dots  12  of the third quantum dot region LD are blue quantum dots, or no quantum dot is disposed, so blue light sources are used for the excited light sources  40 . The black matrices  50  are disposed between different quantum dot regions LD and are configured to block light leakage to prevent light crosstalk between adjacent quantum dot regions LD. 
     One embodiment of the present disclosure further provides a display panel. The display panel includes the quantum dot film of one of the aforesaid embodiments and the plurality of excited light sources. Each quantum dot region corresponds to one of the excited light sources. 
     In one embodiment, please refer to  FIG.  8   .  FIG.  8    is a schematic diagram of a cross-sectional structure of the display panel provided by one embodiment of the present disclosure. The display panel is a liquid crystal display (LCD) panel. The liquid crystal display panel  1000  includes a backlight module  60 , a lower polarizer sheet  65 , an array substrate  66 , a liquid crystal layer  67 , a color film substrate  68 , and an upper polarizer sheet  69  from bottom to top. 
     A direct-lit backlight is used in the backlight module  60 . The backlight module  60  includes a backplate  61  and a reflective sheet  62 , the excited light sources  40 , the quantum dot film  100 , a diffusion sheet  63 , and an optical diaphragm  64 , etc., which are sequentially disposed in an accommodation space formed by the backplate  61 . Wherein, the excited light sources  40  include blue light LED chips. The blue light LED chips are arranged on a light plate  41  in an array manner to provide backlight to the liquid crystal display panel  1000 . The quantum dot film illustrated in  FIG.  8    only takes the quantum dot film  100  in the aforesaid embodiment as an example. The quantum dot film of the liquid crystal display panel  1000  includes the quantum dot film  101  or the quantum dot film  102  of the aforesaid embodiments. 
     In one embodiment, please refer to  FIG.  9   .  FIG.  9    is a schematic diagram of another cross-sectional structure of the display panel provided by one embodiment of the present disclosure. The display panel is a quantum dot light emitting diode (QLED) display panel. From bottom to top, the QLED display panel  1001  sequentially includes a base substrate  70 , a driving circuit layer  71 , a light emitting functional layer  72 , the quantum dot film  103 , and an encapsulation layer  73 , etc. Wherein, the light emitting functional layer  72  includes excited light sources. The excited light sources include blue light LED chips. The quantum dot film includes the quantum dot film  103  of the aforesaid embodiments. Of course, the QLED display panel  1001  can further include a color filter sheet disposed on the encapsulation layer  73 . At this time, the quantum dot film can include the quantum dot film  100 , the quantum dot film  101 , or the quantum dot film  102  of the aforesaid embodiments. 
     One embodiment of the present disclosure provides a display device, which includes the display panel of one of the aforesaid embodiments, circuit boards, other devices bound to the display panel, and cover plates covering the display panel, etc. 
     One embodiment of the present disclosure further provides a manufacturing method of the quantum dot film. Please refer to  FIG.  1    and  FIG.  10    at the same time.  FIG.  10    is a flowchart of the manufacturing method of the quantum dot film provided by one embodiment of the present disclosure. The manufacturing method of the quantum dot film includes following steps. 
     S 201 : manufacturing the first protective layer  20 , wherein manufacturing the first protective layer includes providing a base material layer  31  and manufacturing a barrier layer  32  on the base material layer  31  to form the first protective layer  20 . 
     Specifically, the base material layer  31  includes polyethylene terephthalate, etc., and a layer of an inorganic thin film is deposited on the base material layer  31  to act as the barrier layer  32  by using deposition processes such as chemical vapor deposition (CVD) method, plasma enhance chemical vapor deposition (PECVD) method, atomic layer deposition (ALD) method, etc. A material of the inorganic thin film includes at least one of aluminum nitride, aluminum oxynitride, titanium nitride, titanium oxynitride, zirconium nitride, zirconium oxynitride, silicon oxide, silicon nitride, silicon oxynitride, graphene, etc. The inorganic thin film can effectively block moisture and oxygen from intruding into the quantum dot layers  10 . 
     S 202 : patterning the first protective layer  20  to form the first grooves  21 . 
     Specifically, the first protective layer  20  is divided into a plurality of partitions, the first grooves  21  are manufactured by photo processes in each of the partitions, and the cross-sectional shape of the first grooves  21  is arc. 
     S 203 : manufacturing quantum dot layers  10 , wherein manufacturing the quantum dot layers  10  includes manufacturing the quantum dot layers  10  on the first protective layers  20  and the first grooves  21  to make the quantum dot layers  10  form the protruding structures  13 . 
     Specifically, the quantum dots  12  are dispersed in a macromolecule polymer solution to form a quantum dot glue solution. Optionally, the quantum dots  12  include the red quantum dots  121  and the green quantum dots  122 , and the macromolecule polymer solution is formed by doping macromolecule polymer in an organic solvent. The macromolecule polymer includes one or more of macromolecule polymers such as silicone resin, epoxy resin, polyacrylamide, acrylic resin, photocuring resin, heat curing resin, etc. 
     By spraying the quantum dot glue solution on the first protective layer  20  and the first grooves  21  by a spraying process and then performing a pre-curing process on the sprayed quantum dot glue solution, the quantum dot layers  10  are formed. 
     Specifically, the pre-curing process can be cured by irradiation of ultraviolet light, heating, evaporating solvent, or adding curing agent. For example, when the macromolecule polymer solution is epoxy resin, the quantum dot glue solution is generally cured by adding acid anhydride agents, acid agents, or amine curing agents. When the macromolecule polymer solution is acrylic resin, the quantum dot glue solution is generally cured by irradiation of ultraviolet light or heating. 
     S 204 : manufacturing a second protective layer  30  on the quantum dot layers  10  to form the quantum dot film  100 . 
     Specifically, the base material layer  31  and the barrier layer  32  are sequentially manufactured on the quantum dot layers  10  to form the second protective layer  30 , and then curing is performed on the quantum dot layers  10 . 
     According to the above-mentioned embodiments: 
     In the quantum dot film, the manufacturing method thereof, and the display panel provided by the present disclosure, the quantum dot film are divided into the plurality of quantum dot regions; the quantum dot film includes the quantum dot layers and the first protective layer and the second protective layer disposed on two opposite sides of the quantum dot layers; the grooves are defined on the first protective layer and/or the second protective layer corresponding to each quantum dot region; and the quantum dot layers are filled in the grooves to form the protruding structures. 
     Therefore, the quantum dot layers of each quantum dot region are made to have height differences to reduce optical path differences of different lights at different angles passing through the quantum dot layers, and extents of the lights of different angles passing through the quantum dot layers undergo similar levels of excitation, which prevents occurrences of uneven display. 
     In the above-mentioned embodiments, the description of each embodiment has its emphasis, and for some embodiments that may not be detailed, reference may be made to the relevant description of other embodiments. 
     The embodiments of present disclosure are described in detail above. This article uses specific cases for describing the principles and the embodiments of the present disclosure, and the description of the embodiments mentioned above is only for helping to understand the method and the core idea of the present disclosure. It should be understood by those skilled in the art, that it can perform changes in the technical solution of the embodiments mentioned above, or can perform equivalent replacements in part of technical characteristics, and the changes or replacements do not make the essence of the corresponding technical solution depart from the scope of the technical solution of each embodiment of the present disclosure.