Quantum dot film and display panel

Abstract

This invention provides a quantum dot film and a display panel. The quantum dot film is divided into multiple quantum dot regions. The quantum dot film includes a quantum dot layer and a first protective layer and a second protective layer disposed on opposite sides of the quantum dot layer. A groove is provided in the first protective layer and / or the second protective layer corresponding to each quantum dot region. The quantum dot layer fills the groove to form a raised structure, so that the quantum dot layer in each quantum dot region has a height difference, thereby reducing the optical path difference of light at different angles passing through the quantum dot layer and making the excitation degree of light at different angles similar after passing through the quantum dot layer, so as to alleviate the problem of uneven display in display products.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a quantum dot film and a display panel. Background Technology

[0002] With the development of display technology and the increasing demands of consumers for product display quality, high color gamut display products are becoming increasingly popular. There are many methods to achieve a high color gamut, mainly including the integration of LED chips, phosphors, or quantum dots (QDs) with different components, such as QD-LEDs. The basic principle is to narrow the full width at half maximum (FWHM) of the backlight spectrum, thereby improving color purity and thus expanding the color gamut. Among these, the use of quantum dot film (QD film) is currently the main implementation solution for most high color gamut liquid crystal display (LCD) devices.

[0003] However, for display products that use LEDs as the light source, because the light pattern of LEDs is Lambertian, the light intensity is stronger at the middle angle and weaker at the large angle. Moreover, the light at the middle angle passes directly through the quantum dot film with a short optical path and less excitation, while the light at the large angle passes through the quantum dot film with a long optical path and more excitation. This will cause the light emitted by the middle angle and the large angle to be different after passing through the quantum dot film, resulting in uneven display.

[0004] Therefore, the technical problem of uneven display in existing display products needs to be solved. Summary of the Invention

[0005] This invention provides a quantum dot film and a display panel to alleviate the technical problem of uneven display in existing display products.

[0006] To solve the above problems, the technical solution provided by the present invention is as follows:

[0007] This invention provides a quantum dot film divided into multiple quantum dot regions, the quantum dot film comprising:

[0008] A quantum dot layer, wherein quantum dot layers are provided with quantum dots;

[0009] A first protective layer and a second protective layer are disposed on opposite sides of the quantum dot layer;

[0010] Each quantum dot region has a height difference in its quantum dot layer to reduce the optical path difference between light rays at different incident angles passing through the quantum dot layer.

[0011] In the quantum dot film provided in the embodiments of the present invention, the quantum dot layer of the quantum dot region has a protruding structure.

[0012] In the quantum dot film provided in the embodiments of the present invention, one of the first protective layer and the second protective layer has a first groove in the corresponding quantum dot region, and the protrusion structure fills the first groove.

[0013] In the quantum dot film provided in the embodiments of the present invention, the first protective layer and the second protective layer are respectively provided with a second groove and a third groove corresponding to the quantum dot region, and the protrusion structure fills the second groove and the third groove.

[0014] In the quantum dot film provided in this embodiment of the invention, the second groove and the third groove are arranged opposite to each other.

[0015] In the quantum dot film provided in this embodiment of the invention, the sum of the depth of the second groove and the depth of the third groove is equal to the spacing between the first protective layer and the second protective layer.

[0016] In the quantum dot film provided in this embodiment of the invention, the depth of the second groove and the depth of the third groove are the same.

[0017] In the quantum dot film provided in the embodiments of the present invention, the cross-sectional shape of the protrusion structure includes rectangular, arc-shaped, triangular, and trapezoidal shapes.

[0018] In the quantum dot film provided in the embodiments of the present invention, the quantum dots in different quantum dot regions are the same, and the quantum dots include red quantum dots and green quantum dots.

[0019] In the quantum dot film provided in this embodiment of the invention, the concentration of the quantum dots is positively correlated with the height of the quantum dot layer.

[0020] In the quantum dot film provided in the embodiments of the present invention, the quantum dot film further includes a black matrix, which divides the quantum dot layer into multiple quantum dot regions, wherein the quantum dots in each pair of adjacent quantum dot regions are different.

[0021] This invention also provides a display panel, which includes a quantum dot film of one of the foregoing embodiments and a plurality of excitation light sources, with each quantum dot region corresponding to one of the excitation light sources.

[0022] The beneficial effects of the present invention are as follows: The quantum dot film and display panel provided by the present invention are divided into multiple quantum dot regions. The quantum dot film includes a quantum dot layer and a first protective layer and a second protective layer disposed on opposite sides of the quantum dot layer. The first protective layer and / or the second protective layer corresponding to each quantum dot region are provided with grooves. The quantum dot layer fills the grooves to form a raised structure, so that the quantum dot layer in each quantum dot region has a height difference, thereby reducing the optical path difference of light at different angles passing through the quantum dot layer, making the excitation degree of light at different angles similar after passing through the quantum dot layer, and avoiding uneven display. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic cross-sectional view of a quantum dot film provided in an embodiment of the present invention.

[0025] Figure 2 A detailed schematic diagram of the protective layer provided in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram showing the relationship between the quantum dot region and the excitation source provided in an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram illustrating the principle of reducing optical path difference provided in an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of another cross-sectional structure of the quantum dot film provided in an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of another cross-sectional structure of the quantum dot film provided in an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of another cross-sectional structure of the quantum dot film provided in an embodiment of the present invention.

[0031] Figure 8 This is a cross-sectional structural diagram of a display panel provided in an embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram of another cross-sectional structure of the display panel provided in an embodiment of the present invention.

[0033] Figure 10This is a schematic flowchart of a quantum dot film preparation method provided in an embodiment of the present invention. Detailed Implementation

[0034] The following descriptions of the embodiments are with reference to the accompanying illustrations, illustrating specific embodiments in which the invention can be implemented. Directional terms used in this invention, such as [up], [down], [front], [back], [left], [right], [inner], [outer], [side], etc., are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustration and understanding of the invention, and not for limiting the invention. In the figures, structurally similar units are denoted by the same reference numerals. In the figures, the thickness of some layers and regions is exaggerated for clarity and ease of description. That is, the dimensions and thicknesses of each component shown in the figures are arbitrary, but the invention is not limited thereto.

[0035] Please refer to Figure 1 , Figure 1 This is a cross-sectional structural diagram of a quantum dot film provided in an embodiment of the present invention. The quantum dot film 100 is divided into multiple quantum dot regions LD. The quantum dot film 100 includes a quantum dot layer 10 and a first protective layer 20 and a second protective layer 30 disposed on opposite sides of the quantum dot layer 10. The quantum dot layer 10 is provided with quantum dots 12. Each quantum dot region LD has a height difference in the quantum dot layer 10 to reduce the optical path difference between light rays with different incident angles passing through the quantum dot layer 10.

[0036] In this embodiment, the quantum dot layer 10 of each quantum dot region LD has a height difference to reduce the optical path difference of light rays at different angles passing through the quantum dot layer 10, so that the excitation degree of light rays at different angles passing through the quantum dot layer 10 is similar, thus avoiding uneven display.

[0037] Specifically, continue to refer to Figure 1 The intermediate film layer of the quantum dot film 100 is a quantum dot layer 10, which includes a polymer substrate 11 and quantum dots 12 uniformly dispersed in the polymer substrate 11.

[0038] The quantum dot 12 is a core-shell structure made of semiconductor material, including a central quantum dot core and an outer shell. The quantum dot 12 is made of one or more of the following materials: MgS, CdTe, CdSe, CdS, CdZnS, ZnSe, ZnTe, ZnS, ZnO, GaAs, GaN, GaP, InP, InAs, InN, InSb, AlP, and AlSb. For example, the central core may be a CdSe core, and the outer shell may be a ZnS shell. The particle size of the quantum dot 12 is generally around 10 nanometers. Due to the different sizes of the quantum dots, the emitted light wavelength of the quantum dot 12 varies with the particle size and composition.

[0039] Furthermore, the quantum dot 12, as a photoluminescent material, can convert absorbed short-wavelength light into longer-wavelength light. To obtain a quantum dot film 100 of a predetermined color, the quantum dots 12 in the quantum layer can include one or more types. For example, in this embodiment of the invention, to obtain white light, the quantum dots 12 in the quantum dot layer 10 can include red quantum dots 121 and green quantum dots 122, with the green quantum dots 122 having a smaller particle size and the red quantum dots 121 having a larger particle size. The red quantum dots 121 emit red light when excited by light, and the green quantum dots 122 emit green light when excited by light. Simultaneously, blue light is used as the excitation source, such as a blue LED. The blue light emitted by the blue light source is converted into red and green light through the quantum dot film 100, and the red, green, and blue light are mixed to obtain white light.

[0040] Of course, the quantum dot 12 in this invention is not limited to quantum dots that emit red or green light, but also includes quantum dots that emit any wavelength within the visible light wavelength range. Specifically, it can be set according to the quantum dot film 100 of the desired color.

[0041] The quantum dots 12 are uniformly dispersed in the polymer substrate 11. Specifically, the quantum dot layer 10 can be formed by uniformly dispersing the quantum dots 12 in the polymer solution and then curing it. The polymer solution is formed by doping a polymer with an organic solvent. The polymer includes one or more of the following polymer materials: silicone resin, epoxy resin, polyacrylamide, acrylic resin, photocurable resin, thermocurable resin, etc. For example, the polymer substrate 11 can be polyethylene terephthalate (PET), triacetate cellulose (TAC), etc.

[0042] Furthermore, a first protective layer 20 and a second protective layer 30 are disposed on opposite sides of the quantum dot layer 10. Optionally, the first protective layer 20 is disposed on the lower surface of the quantum dot layer 10, and the second protective layer 30 is disposed on the upper surface of the quantum dot layer 10. The upper surface of the quantum dot layer 10 refers to the light-emitting surface of the quantum dot layer 10, and the lower surface of the quantum dot layer 10 refers to the light-incident surface of the quantum dot layer 10, i.e., the surface irradiated by the excitation light source. The first protective layer 20 and the second protective layer 30 are used to protect the stability of the quantum dot layer 10 structure and simultaneously prevent water and oxygen from intruding into the quantum dot layer 10, causing the quantum dots 12 to fail.

[0043] Alternatively, please refer to Figure 2 , Figure 2This is a detailed schematic diagram of the protective layer provided in an embodiment of the present invention. Both the first protective layer 20 and the second protective layer 30 include a substrate layer 31 and a barrier layer 32 stacked together. The barrier layer 32 is disposed on the side of the substrate layer 31 away from the quantum dot layer 10. The substrate layer 31 can be polyethylene terephthalate, etc., and the barrier layer 32 can be made of inorganic materials with strong water and oxygen blocking capabilities. The dense arrangement of inorganic materials at the atomic level can effectively block water vapor and oxygen. For example, the inorganic materials include at least one of aluminum nitride, aluminum oxynitride, titanium nitride, titanium oxynitride, zirconium nitride, zirconium oxynitride, silicon oxide, silicon nitride, silicon oxynitride, and graphene.

[0044] Of course, the first protective layer 20 and the second protective layer 30 may also include a diffusion layer 33 disposed on the side of the barrier layer 32 away from the substrate layer 31 to improve the uniformity of light.

[0045] The first protective layer 20 and the second protective layer 30, together with the quantum dot layer 10, form a quantum dot film 100. The quantum dot film 100 is divided into multiple quantum dot regions LD. The quantum dots 12 disposed in the quantum dot layer 10 are the same in different quantum dot regions LD; for example, the quantum dot layer 10 is provided with red quantum dots 121 and green quantum dots 122. Thus, after the excitation light source passes through the quantum dot film 100, the emitted light from each quantum dot region LD is white light. Optionally, please refer to... Figure 3 , Figure 3 This is a schematic diagram showing the correspondence between quantum dot regions and excitation light sources provided in an embodiment of the present invention. Each quantum dot region LD corresponds to one excitation light source 40, for example, each quantum dot region LD corresponds to one blue LED chip.

[0046] Furthermore, each quantum dot region LD has a height difference in its quantum dot layer 10, which can be formed by providing a protrusion structure 13 on the corresponding quantum dot layer 10. By providing the quantum dot layer 10 with a height difference, the optical path difference of light passing through the quantum dot film 100 can be reduced.

[0047] The formation of the protrusion structure 13 and the principle of reducing the optical path difference of light passing through the quantum dot film 100 will be explained below with reference to specific embodiments.

[0048] Specifically, the quantum dot layer 10 of the quantum dot region LD has a protrusion structure 13, and one of the first protective layer 20 and the second protective layer 30 has a first groove 21 corresponding to the quantum dot region LD. The protrusion structure 13 fills the first groove 21, that is, the quantum dot layer 10 fills the first groove 21 to form the protrusion structure 13.

[0049] Optionally, a first groove 21 is provided on the first protective layer 20 corresponding to each quantum dot region LD. The cross-sectional shape of the first groove 21 is arc-shaped, but the present invention is not limited to this. The cross-sectional shape of the first groove 21 of the present invention also includes any one of the shapes such as rectangle, triangle, trapezoid, or other irregular shapes. In this embodiment, an arc-shaped cross-sectional shape is used as an example. The quantum dot layer 10 fills the first groove 21 to form the protruding structure 13. The cross-sectional shape of the protruding structure 13 is also arc-shaped, and the radius of curvature of the arc gradually increases from the middle to both sides. It can be understood that when the quantum dot layer 10 fills the first groove 21 to form the protruding structure 13, the cross-sectional shape of the protruding structure 13 is the same as the cross-sectional shape of the first groove 21. The presence of the protruding structure 13 creates a height difference in the quantum dot layer 10, thereby reducing the optical path difference of light passing through the quantum dot layer 10.

[0050] Specifically, please refer to the following: Figure 3 and Figure 4 , Figure 4 This is a schematic diagram illustrating the principle of reducing optical path difference provided in an embodiment of the present invention. Figure 4 In this design, each quantum dot region LD corresponds to an excitation light source 40. The middle portion of the protruding structure 13 faces the excitation light source 40. Optionally, the center line O-O' of the protruding structure 13 coincides with the center line of the excitation light source 40. The middle portion of the protruding structure 13 refers to the part of the protruding structure 13 located at the bottom of the first groove 21. The quantum dot layer 10 corresponding to this part is the thickest, that is, the thickness of the quantum dot layer 10 gradually decreases from the middle portion of the protruding structure 13 towards both sides of the protruding structure 13.

[0051] When the light emitted by the excitation light source 40 passes through the quantum dot layer 10, due to the presence of the protrusion structure 13, the optical path difference of the light passing through the quantum dot layer 10 is similar or equal, which can reduce the optical path difference of the light passing through the quantum dot layer 10 at different angles.

[0052] Specifically, such as Figure 4As shown, two rays emitted by the excitation light source 40 are illustrated. The first ray A is perpendicularly incident on the middle part of the protrusion structure 13 of the quantum dot layer 10, that is, the region where the quantum dot layer 10 is thicker. The second ray B is incident on the edge part of the protrusion structure 13, that is, the region where the quantum dot layer 10 is thinner. The second ray B can be a neighboring ray of the excitation light source 40. In this way, the optical path S1 of the first ray A through the quantum dot layer 10 and the optical path S2 of the second ray B through the quantum dot layer 10 are similar or equal, reducing the optical path difference between the first ray A and the second ray B through the quantum dot layer 10.

[0053] Of course, this embodiment of the invention only illustrates the effect of the protrusion structure 13 on the quantum dot layer 10 by taking the reduction of the optical path difference between the first ray A and the second ray B as an example. For other rays located between the first ray A and the second ray B, as the thickness of the quantum dot layer 10 changes, the optical path of these other rays through the quantum dot layer 10 is also similar to or equal to that of the first ray A and the second ray B through the quantum dot layer 10. Thus, the optical paths of the light emitted by the excitation source 40 through the quantum dot layer 10 are all similar or equal, making the degree of excitation by the quantum dots 12 similar or the same, thereby making the light output of the quantum dot film 100 more uniform at different viewing angles.

[0054] It should be noted that the depth and slope of the first groove 21 can be specifically determined based on factors such as the range of optical path difference reduction to be achieved, the light emission angle of the excitation light source 40, and the thickness of the quantum dot layer 10.

[0055] In this embodiment, by providing an arc-shaped first groove 21 on the first protective layer 20, the quantum dot layer 10 forms an arc-shaped protrusion structure 13, so that the light emitted by the excitation light source 40 passes through the quantum dot layer 10 with similar or equal optical paths, thereby reducing the optical path difference and avoiding uneven display phenomena.

[0056] In one embodiment, please refer to Figure 5 , Figure 5This is another cross-sectional structural diagram of the quantum dot film provided in an embodiment of the present invention. Unlike the embodiments described above, the quantum dot film 101 includes a quantum dot layer 10 and a first protective layer 20 and a second protective layer 30 located on opposite sides of the quantum dot layer 10. In each quantum dot region LD, the first protective layer 20 and the second protective layer 30 are respectively provided with a second groove 22 and a third groove 23. The protrusion structure 13 of the quantum dot layer 10 fills the second groove 22 and the third groove 23, thus balancing the thickness difference between the first protective layer 20 and the second protective layer 30.

[0057] Specifically, the second groove 22 and the third groove 23 are arranged opposite to each other. Optionally, the projections of the second groove 22 and the third groove 23 in the vertical direction coincide. The cross-sectional shape of the second groove 22 and the third groove 23 is rectangular. Of course, the present invention is not limited to this. The cross-sectional shape of the second groove 22 and the third groove 23 of the present invention also includes any one of the following shapes: arc, triangle, trapezoid, or other irregular shapes. In this embodiment, a rectangular cross-sectional shape is used as an example. The quantum dot layer 10 fills the second groove 22 and the third groove 23 to form corresponding protrusion structures 13, and the cross-sectional shape of the protrusion structure 13 is also rectangular. It can be understood that when the quantum dot layer 10 fills the second groove 22 and the third groove 23 to form corresponding protrusion structures 13, the cross-sectional shape of the protrusion structure 13 is the same as the cross-sectional shape of the second groove 22 and the third groove 23. The presence of the protrusion structure 13 creates a height difference in the quantum dot layer 10, thereby reducing the optical path difference of light passing through the quantum dot layer 10.

[0058] Furthermore, the sum of the depths of the second groove 22 and the third groove 23 is equal to the spacing between the first protective layer 20 and the second protective layer 30. Optionally, the depths of the second groove 22 and the third groove 23 are the same. By providing grooves with the same structure in the first protective layer 20 and the second protective layer 30, the first protective layer 20 and the second protective layer 30 can also be provided with the same film thickness, so as to balance the difference in film thickness between the first protective layer 20 and the second protective layer 30, and ensure the effective water and oxygen blocking effect of the first protective layer 20 and the second protective layer 30 while minimizing the overall thickness of the quantum dot film 100.

[0059] In this embodiment, by setting the second groove 22 and the third groove 23, the quantum dot layer 10 forms two protrusion structures 13. The presence of the protrusion structures 13 creates a height difference between the upper and lower sides of the quantum dot layer 10, thus making the optical path length of light passing through the quantum dot layer 10 similar or equal, and making the degree of excitation by the quantum dots 12 similar or the same, thereby making the light output of the quantum dot film 100 more uniform under different viewing angles. Other descriptions are as described in the above embodiment and will not be repeated here.

[0060] In one embodiment, please refer to Figure 6 , Figure 6 This is a schematic cross-sectional view of another quantum dot film provided in an embodiment of the present invention. Unlike the embodiments described above, the quantum dot film 102 includes a quantum dot layer 10 and a first protective layer 20 and a second protective layer 30 located on opposite sides of the quantum dot layer 10. In each quantum dot region LD, the quantum dot layer 10 has a protrusion structure 13 that creates a height difference between the quantum dot layer 10 and the first protective layer 20 or the second protective layer 30, and a gap exists between the quantum dot layer 10 and the first protective layer 20 or the second protective layer 30. That is, the surfaces of the first protective layer 20 and the second protective layer 30 are flat and do not have grooves; the presence of the protrusion structure 13 creates a gap between the quantum dot layer 10 and the first protective layer 20 or the second protective layer 30.

[0061] Specifically, such as Figure 6 As shown, there is a gap 34 between the quantum dot layer 10 and the second protective layer 30. Of course, in order to prevent the quantum dots 12 of the quantum dot layer 10 from failing, water and oxygen are not allowed to exist in the gap 34. Therefore, when the second protective layer 30 is set on the quantum dot layer 10, it needs to be carried out under specific process conditions, such as in a vacuum drying environment.

[0062] Furthermore, the cross-sectional shape of the protrusion structure 13 is rectangular. However, the invention is not limited to this; the cross-sectional shape of the protrusion structure 13 may also include any one of the following shapes: arc-shaped, triangular, trapezoidal, or other irregular shapes. In this embodiment, a rectangular cross-sectional shape is used as an example. The presence of the protrusion structure 13 creates a height difference in the quantum dot layer 10, thereby reducing the optical path difference of light passing through the quantum dot layer 10 and making the degree of excitation by the quantum dots 12 similar or the same.

[0063] Optionally, the concentration of quantum dots 12 in the quantum dot layer 10 varies, and the concentration of quantum dots 12 is positively correlated with the height of the quantum dot layer 10, meaning that the concentration of quantum dots 12 increases as the height of the quantum dot layer 10 increases. Specifically, the concentration of quantum dots 12 is higher in the region of the quantum dot layer 10 corresponding to the area with the protrusion structure 13, and lower in the region of the quantum dot layer 10 corresponding to the area without the protrusion structure 13. Since the concentration of quantum dots 12 is related to the amount of light excited by the quantum dot layer 10 to produce other colors of light, by setting different concentrations of quantum dots 12 in different regions, the degree of excitation of light by quantum dots 12 passing through the quantum dot layer 10 can be further improved, making the light output of the quantum dot film 100 more uniform at different viewing angles.

[0064] In this embodiment, by providing a protrusion structure 13 on the quantum dot layer 10, a height difference is formed in the quantum dot layer 10. This ensures that the optical path length of light passing through the quantum dot layer 10 is similar or equal, and that the degree of excitation by the quantum dots 12 is similar or the same. Consequently, the light emission from the quantum dot film 100 is more uniform at different viewing angles. Other descriptions are as described in the above embodiment and will not be repeated here.

[0065] In one embodiment, please refer to Figure 7 , Figure 7 This is another cross-sectional structural diagram of the quantum dot film provided in an embodiment of the present invention. Unlike the above embodiment, the quantum dot film 103 includes a quantum dot layer 10, a first protective layer 20 and a second protective layer 30 located on opposite sides of the quantum dot layer 10, and a black matrix 50 dividing the quantum dot layer 10 into multiple quantum dot regions LD. The quantum dots 12 of each pair of adjacent quantum dot regions LD are different, and the quantum dot layer 10 has a height difference in each quantum dot region LD.

[0066] Specifically, such as Figure 7As shown, a first groove 21 is provided on the first protective layer 20 corresponding to each quantum dot region LD. The cross-sectional shape of the first groove 21 is trapezoidal. Of course, the cross-sectional shape of the first groove 21 also includes any one of the shapes such as rectangle, triangle, arc, or other irregular shapes. In this embodiment, a trapezoidal cross-sectional shape is used as an example. The quantum dot layer 10 fills the first groove 21 to form the protruding structure 13, and the cross-sectional shape of the protruding structure 13 is also trapezoidal. It can be understood that when the quantum dot layer 10 fills the first groove 21 to form the protruding structure 13, the cross-sectional shape of the protruding structure 13 is the same as the cross-sectional shape of the first groove 21. The presence of the protruding structure 13 creates a height difference in the quantum dot layer 10, thereby reducing the optical path difference of light passing through the quantum dot layer 10.

[0067] Furthermore, the black matrix 50 divides the quantum dot layer 10 into multiple quantum dot regions (LDs). The quantum dots 12 of each pair of adjacent quantum dot regions (LDs) are different, and each pair of three adjacent quantum dot regions (LDs) forms a light-emitting unit. These multiple light-emitting units are arranged in a cyclical pattern. 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 dots are present. Thus, the excitation light source 40 uses a blue light source. The black matrix 50 is positioned between different quantum dot regions (LDs) to block light leakage and avoid optical crosstalk between adjacent quantum dot regions (LDs).

[0068] This invention also provides a display panel, which includes a quantum dot film of one of the above embodiments and a plurality of excitation light sources, with each quantum dot region corresponding to one of the excitation light sources.

[0069] In one embodiment, please refer to Figure 8 , Figure 8 This is a cross-sectional structural diagram of a display panel provided in an embodiment of the present invention. The display panel is a liquid crystal display (LCD) panel. The liquid crystal display panel 1000 includes, from bottom to top, a backlight module 60, a lower polarizer 65, an array substrate 66, a liquid crystal layer 67, a color filter substrate 68, and an upper polarizer 69.

[0070] The backlight module 60 employs a direct-lit backlight and includes a backplate 61, a reflective sheet 62 sequentially disposed within a receiving space formed by the backplate 61, an excitation light source 40, a quantum dot film 100, a diffuser 63, and an optical film 64, etc. The excitation light source 40 includes blue LED chips, and the blue LED chip array is arranged on the lamp board 41 to provide backlighting for the liquid crystal display panel 1000. Figure 8 The quantum dot film shown is only an example of the quantum dot film 100 in the above embodiments. The quantum dot film of the liquid crystal display panel 1000 includes the quantum dot film 101 and quantum dot film 102 in the above embodiments.

[0071] In one embodiment, please refer to Figure 9 , Figure 9 This is a schematic cross-sectional view of another display panel provided in an embodiment of the present invention. The display panel is a quantum dot light-emitting diode (QLED) display panel. The QLED display panel 1001 includes, from bottom to top, a substrate 70, a driving circuit layer 71, a light-emitting functional layer 72, a quantum dot film 103, and an encapsulation layer 74. The light-emitting functional layer 72 includes an excitation light source, which includes a blue LED chip. The quantum dot film includes the quantum dot film 103 described in the above embodiment. Of course, the QLED display panel 1001 may also include a color filter disposed on the encapsulation layer 74. In this case, the quantum dot film may include the quantum dot film 100, the quantum dot film 101, and the quantum dot film 102 described in the above embodiment.

[0072] This invention also provides a display device, which includes a display panel of one of the foregoing embodiments, a circuit board and other components bonded to the display panel, and a cover plate covering the display panel.

[0073] This invention also provides a method for preparing quantum dot films, please refer to the following: Figure 1 and Figure 10 , Figure 10 This is a schematic flowchart of a quantum dot film preparation method provided by an embodiment of the present invention. The quantum dot film preparation method includes the following steps:

[0074] S201: Preparing the first protective layer 20 includes providing a substrate layer 31 and preparing a barrier layer 32 on the substrate layer 31 to form the first protective layer 20;

[0075] Specifically, the substrate layer 31 includes polyethylene terephthalate, etc., and an inorganic thin film is deposited on the substrate layer 31 as a barrier layer 32 using deposition processes such as chemical vapor deposition (CVD), plasma-enhanced chemical vapor deposition (PECVD), and atomic layer deposition (ALD). The inorganic thin film is made of at least one of aluminum nitride, aluminum oxynitride, titanium nitride, titanium oxynitride, zirconium nitride, zirconium oxynitride, silicon oxide, silicon nitride, silicon oxynitride, and graphene. The inorganic thin film can effectively prevent water vapor and oxygen from penetrating the quantum dot layer 10.

[0076] S202: Pattern the first protective layer 20 to form a first groove 21;

[0077] Specifically, the first protective layer 20 is divided into multiple partitions, and the first groove 21 is prepared in each partition using a photolithography process. The cross-sectional shape of the first groove 21 is arc-shaped.

[0078] S203: Prepare quantum dot layer 10, including preparing quantum dot layer 10 on the first protective layer 20 and in the first groove 21, so that quantum dot layer 10 forms protrusion structure 13;

[0079] Specifically, quantum dots 12 are dispersed in a polymer solution to form a quantum dot adhesive. Optionally, the quantum dots 12 include red quantum dots 121 and green quantum dots 122. The polymer solution is formed by doping a polymer with an organic solvent. The polymer includes one or more of the following polymeric materials: silicone resin, epoxy resin, polyacrylamide, acrylic resin, photocurable resin, thermocurable resin, etc.

[0080] The quantum dot adhesive is sprayed onto the first protective layer 20 and the first groove 21 using processes such as spraying. Then, the sprayed quantum dot adhesive is pre-cured to form the quantum dot layer 10.

[0081] Specifically, pre-curing can be achieved through methods such as ultraviolet light irradiation, heating, solvent evaporation, or the addition of a curing agent. For example, when the polymer solution is epoxy resin, the quantum dot adhesive is generally cured by adding anhydride, acid, or amine curing agents. When the polymer solution is acrylic resin, the quantum dot adhesive is generally cured by ultraviolet light irradiation or heating.

[0082] S204: A second protective layer 30 is prepared on the quantum dot layer 10 to form a quantum dot film 100.

[0083] Specifically, the substrate layer 31 and the barrier layer 32 are sequentially prepared on the quantum dot layer 10 to form the second protective layer 30, and then the quantum dot layer 10 is re-cured.

[0084] As can be seen from the above embodiments:

[0085] The quantum dot film and display panel provided by this invention are divided into multiple quantum dot regions. The quantum dot film includes a quantum dot layer and a first protective layer and a second protective layer disposed on opposite sides of the quantum dot layer. The first protective layer and / or the second protective layer corresponding to each quantum dot region are provided with grooves. The quantum dot layer fills the grooves to form a raised structure, so that the quantum dot layer in each quantum dot region has a height difference, thereby reducing the optical path difference of light at different angles passing through the quantum dot layer and making the excitation degree of light at different angles similar after passing through the quantum dot layer, thus avoiding uneven display.

[0086] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0087] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A quantum dot film, characterized in that, The quantum dot film is divided into multiple quantum dot regions, comprising: A quantum dot layer, wherein quantum dot layers are provided with quantum dots, and the quantum dot layer in the quantum dot region has a protruding structure; A first protective layer and a second protective layer are disposed on opposite sides of the quantum dot layer; The quantum dot layers are continuously arranged in a single layer, and the quantum dots in different quantum dot regions are the same. Each quantum dot region of the quantum dot layer has a height difference to reduce the optical path difference between light rays with different incident angles passing through the quantum dot layer. The concentration of the quantum dots is positively correlated with the height of the quantum dot layer. The concentration of quantum dots in the region of the quantum dot layer where the protrusion structure is provided is greater than that in the region of the quantum dot layer where the protrusion structure is not provided is greater than that in the region of the quantum dot layer.

2. The quantum dot film according to claim 1, characterized in that, One of the first protective layer and the second protective layer has a first groove in the corresponding quantum dot region, and the protruding structure fills the first groove.

3. The quantum dot film according to claim 1, characterized in that, The first protective layer and the second protective layer are respectively provided with a second groove and a third groove in the corresponding quantum dot region, and the protruding structure fills the second groove and the third groove.

4. The quantum dot film according to claim 3, characterized in that, The second groove and the third groove are arranged opposite to each other.

5. The quantum dot film according to claim 3, characterized in that, The sum of the depth of the second groove and the depth of the third groove is equal to the spacing between the first protective layer and the second protective layer.

6. The quantum dot film according to claim 5, characterized in that, The second groove has the same depth as the third groove.

7. The quantum dot film according to any one of claims 1 to 6, characterized in that, The cross-sectional shape of the protruding structure includes rectangle, arc, triangle, and trapezoid.

8. The quantum dot film according to any one of claims 1 to 6, characterized in that, The quantum dots include red quantum dots and green quantum dots.

9. A display panel, characterized in that, It includes the quantum dot film as described in any one of claims 1 to 8 and a plurality of excitation sources, with each quantum dot region corresponding to one of the excitation sources.

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