Backlight module and display device

Abstract

The invention relates to a backlight module and a display device. The backlight module comprises a light-emitting assembly and a second color conversion part; the light-emitting assembly comprises at least one light-emitting part, the light-emitting part comprises a light source and a first color conversion part, and the first color conversion part is located on the light-emitting side of the light source and is configured to convert light emitted by the light source into first light rays; the second color conversion part is arranged on the light emitting side of the light emitting assembly, the second color conversion part comprises a second color conversion material, and the second color conversion material is configured to excite a second light ray; the proportion of the light in the first wavelength range in the first light is smaller than the proportion of the light in the first wavelength range in the second light; the light within the first wavelength range in the backlight module can be supplemented, so that the emergent light of the backlight module is closer to natural light, the visual fatigue of a user is reduced, and the eye protection effect is achieved; the second light excited by the second color conversion part is prevented from being secondarily absorbed in the first color conversion part, and the light emitting efficiency and the light emitting effect of the backlight module are improved.

Description

Technical Field

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

[0002] In LED backlight modules, blue light LEDs are often combined with fluorescent materials. The fluorescent materials can absorb the blue light emitted by the blue LEDs and convert it into light of other colors, which are finally mixed to form white light.

[0003] However, the spectrum of white light generated in current LED backlight modules is discontinuous and differs greatly from the spectrum of sunlight. This discontinuous white light with dispersed luminous peaks has a greater stimulation on the visual cells in the human eye and can easily cause visual fatigue. Summary of the Invention

[0004] The embodiments of the present application provide a backlight module and a display device, which can supplement the light within a first wavelength range in the backlight module, so that the light emitted by the backlight module is closer to natural light.

[0005] The present invention provides a backlight module, which includes:

[0006] A light-emitting assembly comprising at least one light-emitting element, the light-emitting element comprising a light source and a first color conversion portion, the first color conversion portion being located on a light-emitting side of the light source and configured to convert light emitted by the light source into a first light beam;

[0007] a second color conversion portion, disposed on a light-emitting side of the light-emitting component, the second color conversion portion comprising a second color conversion material, and the second color conversion material is configured to excite a second light;

[0008] The proportion of light within the first wavelength range in the first light is smaller than the proportion of light within the first wavelength range in the second light.

[0009] In one embodiment of the present application, the second color conversion portion includes a substrate layer, the second color conversion material includes first quantum dots distributed in the substrate layer, and the first wavelength range is 465 nm-515 nm.

[0010] In one embodiment of the present application, the second color conversion portion further includes a barrier layer disposed on at least one side of the substrate layer, and the material of the substrate layer and the barrier layer are selected from at least one of polymethyl methacrylate, polyethylene terephthalate, polystyrene, polyethylene naphthalate, cycloolefin polymer and cycloolefin copolymer.

[0011] In one embodiment of the present application, the second color conversion portion further includes a third color conversion material distributed in the substrate layer, the third color conversion material is configured to excite a third light, and the proportion of light within the second wavelength range in the first light is less than the proportion of light within the second wavelength range in the third light.

[0012] In one embodiment of the present application, the third color conversion material includes second quantum dots distributed in the substrate layer, the particle size of the second quantum dots is larger than the particle size of the first quantum dots, and the maximum value in the second wavelength range is larger than the maximum value in the first wavelength range.

[0013] In one embodiment of the present application, the second color conversion portion partially overlaps with the light-emitting element along the thickness direction of the backlight module, and the second color conversion portion is located on a side of the first color conversion portion away from the light source.

[0014] In one embodiment of the present application, the light-emitting component includes a light guide plate, the light guide plate includes a first surface and a second surface arranged opposite to each other, and a side surface connected between the first surface and the second surface, the light-emitting component is arranged on the side surface of the light guide plate, the light-emitting side of the light-emitting component faces the side surface of the light guide plate, and the second color conversion portion is arranged on the first surface side or the second surface side of the light guide plate.

[0015] In one embodiment of the present application, the first color conversion portion includes an encapsulation layer and a first color conversion material, the encapsulation layer covers the light source, and the first color conversion material is distributed in the encapsulation layer.

[0016] In one embodiment of the present application, the backlight module further includes a plurality of optical films, which are arranged between the second color conversion portion and the light-emitting component, and / or the optical films are arranged on a side of the second color conversion portion away from the light-emitting component.

[0017] According to the above-mentioned purpose of the present application, an embodiment of the present application further provides a display device, which includes a display panel and the backlight module, and the display panel is located on a side of the second color conversion portion away from the light-emitting component.

[0018] The present application provides a backlight module and a display device. By adding a second color conversion part on the light-emitting side of the light-emitting component, and the second color conversion part contains a second color conversion material, the second color conversion material can excite a larger proportion of light in the first wavelength range in the second light, and thus can supplement the light in the first wavelength range in the first light, so that the continuity of the light-emitting spectrum of the backlight module is better, closer to natural light, reducing the user's visual fatigue, and achieving an eye protection effect; in addition, the present application separates the second color conversion part from the first color conversion part, and the second color conversion part is located outside the light-emitting component, thereby avoiding the second light excited by the second color conversion part from being absorbed twice in the first color conversion part, which can improve the light extraction efficiency of the light in the first wavelength range, and thus improve the light extraction efficiency and light extraction effect of the backlight module.

[0019] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0021] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0022] Figures 1a to 1c The light spectrum curve diagram of the backlight module in the related art;

[0023] Figure 2 A schematic structural diagram of a backlight module provided in an embodiment of the present application;

[0024] Figure 3 A schematic structural diagram of a light-emitting element provided in an embodiment of the present application;

[0025] Figure 4 A schematic structural diagram of a light-emitting component provided in an embodiment of the present application;

[0026] Figure 5 Another structural diagram of the backlight module provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of another structure of the backlight module provided in an embodiment of the present application;

[0028] Figure 7 An absorption / fluorescence spectrum of the first quantum dot provided in an embodiment of the present application;

[0029] Figure 8 A schematic structural diagram of a backlight module in related art;

[0030] Figure 9 A spectrum curve diagram of the backlight module provided in an embodiment of the present application;

[0031] Figure 10 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0032] Figure 11 A schematic structural diagram of a display device in related art;

[0033] Figure 12 This is a spectrum curve diagram of a white screen of a display device provided in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 10. Light-emitting component; 11. Light-emitting element; 111. Light source; 112. First color conversion unit; 1121. First color conversion material; 1122. Encapsulation layer; 12. Light guide plate; 121. First surface; 122. Second surface; 123. Side surface; 13. Shading unit; 20. Second color conversion unit; 21. Second color conversion material; 211. First quantum dot; 22. Base material layer; 23. Barrier layer; 231. First barrier layer; 232. Second barrier layer; 24. Third color conversion material; 241. Second quantum dot; 30. Optical film; 31. First diffuser; 32. First prism sheet; 33. Second prism sheet; 34. Second diffuser; 40. Display panel. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] Please refer to Figures 1a to 1c Current LED backlight modules often combine blue LEDs with fluorescent materials. The fluorescent materials absorb the blue light emitted by the blue LEDs and convert it into other colors, which are then mixed to form white light. However, the spectrum of white light generated by current LED backlight modules is discontinuous and differs significantly from the spectrum of sunlight. For example, there is a large gap between blue and green light, and the cyan light (460-500nm) is severely missing. This discontinuous white light with dispersed emission peaks can significantly stimulate the visual cells in the human eye and easily cause visual fatigue.

[0038] Please refer to Figure 2 and Figure 3 , an embodiment of the present application provides a backlight module, which includes a light-emitting component 10 and a second color conversion unit 20; the light-emitting component 10 includes at least one light-emitting element 11, the light-emitting element 11 includes a light source 111 and a first color conversion unit 112, the first color conversion unit 112 is located on the light-emitting side of the light source 111, and the first color conversion unit 112 is configured to convert the light emitted by the light source 111 into a first light; the second color conversion unit 20 is arranged on the light-emitting side of the light-emitting component 10, the second color conversion unit 20 includes a second color conversion material 21, and the second color conversion material 21 is configured to excite a second light.

[0039] The proportion of light within the first wavelength range in the first light is smaller than the proportion of light within the first wavelength range in the second light.

[0040] During the implementation and application process, the embodiment of the present application adds a second color conversion part 20 on the light-emitting side of the light-emitting component 10, and the second color conversion part 20 contains a second color conversion material 21. The second color conversion material 21 can excite a larger proportion of light in the first wavelength range in the second light, and thus can supplement the light in the first wavelength range in the first light, so that the continuity of the light-emitting spectrum of the backlight module is better, closer to natural light, reducing the user's visual fatigue, and achieving an eye protection effect; in addition, the present application separates the second color conversion part 20 from the first color conversion part 112, and the second color conversion part 20 is located outside the light-emitting component 10, thereby avoiding the second light excited by the second color conversion part 20 from being absorbed twice in the first color conversion part 112, which can improve the light extraction efficiency of the light in the first wavelength range, and thus improve the light extraction efficiency and light extraction effect of the backlight module.

[0041] For details, please refer to Figure 2 as well as Figure 3 The backlight module provided in the embodiment of the present application includes a light-emitting component 10 , a second color conversion unit 20 and an optical film 30 .

[0042] The light emitting assembly 10 may include a light emitting element 11 and a functional structure, and the functional structure may be used to improve the light emitting path or light emitting effect of the light emitting element 11 .

[0043] In some embodiments, the light emitting element 11 may include a light source 111 and a first color conversion portion 112 , and the first color conversion portion 112 is located on the light emitting side of the light source 111 to absorb light emitted by the light source 111 and convert it into first light.

[0044] In some embodiments, the light source 111 can be an LED chip. For example, the light source 111 can include at least one of a blue LED, a purple LED, or an ultraviolet LED. Correspondingly, the blue LED can emit blue light (430nm-460nm), the purple LED can emit purple light (400nm-430nm), and the ultraviolet LED can emit ultraviolet light (300nm-400nm).

[0045] The first color conversion unit 112 can absorb the light emitted by the light source 111 and convert it into a first light, and the first light can be mixed white light.

[0046] In some embodiments, the first color conversion unit 112 may include a first color conversion material 1121. The first color conversion material 1121 may be a fluorescent material, for example, it may include yellow, red and green phosphors. Correspondingly, the first color conversion unit 112 may absorb the light emitted by the light source 111, and then stimulate yellow light, red light and green light, which are then mixed with the light emitted by the light source 111 to form white light, that is, to form the first light.

[0047] It is understandable that the first light may include light formed by mixing at least one of yellow light, red light and green light with light emitted by the light source 111 , which is determined by the type and amount of the fluorescent material in the first color conversion material 1121 .

[0048] In some embodiments, the first color conversion unit 112 includes an encapsulation layer 1122 covering the light source 111 , and the first color conversion material 1121 is distributed in the encapsulation layer 1122 ; the encapsulation layer 1122 may be a transparent encapsulation adhesive.

[0049] In some embodiments, please refer to Figure 2 When the backlight module is a direct-type backlight module, the light-emitting component 10 may further include a backplane, and the light-emitting element 11 is arranged on the backplane, and the second color conversion portion 20 and the optical film 30 are both located on the side of the light-emitting element 11 away from the backplane; specifically, the second color conversion portion 20 and the light-emitting element 11 partially overlap along the thickness direction of the backlight module, and the second color conversion portion 20 is located on the side of the first color conversion portion 112 away from the light source 111.

[0050] In some embodiments, please combine Figure 2 as well as Figure 4When the backlight module is an edge-entry backlight module, the light-emitting component 10 may further include a light guide plate 12, wherein the light guide plate 12 may include a first surface 121 and a second surface 122 arranged opposite to each other, and a side surface 123 connected between the first surface 121 and the second surface 122; and the light-emitting element 11 is arranged on the side of the light guide plate 12, the light-emitting side of the light-emitting element 11 faces the side of the light guide plate 12, and the second color conversion portion 20 is arranged on the side of the first surface 121 or the side of the second surface 122 of the light guide plate 12.

[0051] exist Figure 4 In the specific embodiment shown, a grid structure is provided on the second surface 122 of the light guide plate 12 so that the light emitted by the light-emitting element 11 located at the side 123 can be emitted along the second surface 122 in a direction close to the first surface 121 to adjust the light emission path of the light-emitting element 11; therefore, the second color conversion portion 20 can be provided on one side of the first surface 121 of the light guide plate 12 to absorb the light emitted by the light-emitting element 11 and stimulate the second light, and the second light can be mixed with the light emitted by the light-emitting element 11 and then emitted.

[0052] In some embodiments, the light-emitting component 10 may further include a shading portion 13, and the shading portion 13 may be disposed on the first surface 121 and close to the side surface 123, and may be used to shield the edge of the backlight module, and then after the backlight module is subsequently used in a display device, it may be used to shield the edge of the display device.

[0053] Please continue to combine Figure 2 as well as Figure 3 The number of optical films 30 in the backlight module can be multiple, wherein the optical film 30 is arranged between the second color conversion part 20 and the light-emitting component 10, and / or the optical film 30 is arranged on the side of the second color conversion part 20 away from the light-emitting component 10.

[0054] It is understandable that the position of the optical film 30 can be in various situations. For example, part of the optical film 30 can be located between the second color conversion portion 20 and the light-emitting component 10, and another part of the optical film can be located on the side of the second color conversion portion 20 away from the light-emitting component 10; or, all of the optical film 30 can be located between the second color conversion portion 20 and the light-emitting component 10; or, all of the optical film 30 can be located on the side of the second color conversion portion 20 away from the light-emitting component 10, such as Figure 2 As shown; since the optical film 30 can adjust and improve the optical path of the light, the light extraction efficiency can be improved. Therefore, the embodiment of the present application positions all the optical films 30 on the side of the second color conversion portion 20 away from the light-emitting component 10, so that the light adjusted by the second color conversion portion 20 can pass through all the optical films 30, thereby effectively improving the light extraction efficiency and light extraction effect of the backlight module.

[0055] In some embodiments, the plurality of optical films 30 may include a first diffuser 31, a first prism sheet 32, a second prism sheet 33 and a second diffuser 34; wherein the first diffuser 31 is arranged on the side of the second color conversion portion 20 away from the light-emitting component 10, the first prism sheet 32 ​​is arranged on the side of the first diffuser 31 away from the second color conversion portion 20, the second prism sheet 33 is arranged on the side of the first prism sheet 32 ​​away from the first diffuser 31, and the second diffuser 34 is arranged on the side of the second prism sheet 33 away from the first prism sheet 32.

[0056] In some embodiments, the optical film 30 may further include a brightness enhancement film disposed on a side of the second diffusion sheet 34 away from the second prism sheet 33 to further improve the light extraction effect of the backlight module.

[0057] It should be noted that the light-emitting component 10 forms white light by mixing the light emitted by the light source 111 and the excited light emitted by the first color conversion unit 112; however, the spectrum of the formed white light is discontinuous or has poor continuity, and is quite different from the spectrum of sunlight. For example, there is a very large gap between blue light and green light, that is, the lack of cyan light (460-500nm) is relatively serious; and this discontinuous white light with dispersed luminous peaks has a greater stimulation to the visual cells in the human eye and can easily cause visual fatigue.

[0058] The second color conversion portion 20 provided in the embodiment of the present application is located on the light-emitting side of the light-emitting component 10, and the second color conversion portion 20 contains a second color conversion material 21. The second color conversion material 21 can absorb the first light emitted by the light-emitting component 10 and stimulate the emission of a second light. In this case, the proportion of light within the first wavelength range in the first light is less than the proportion of light within the first wavelength range in the second light. Therefore, the embodiment of the present application can supplement the light within the first wavelength range in the backlight module, making the light emission spectrum of the backlight module more continuous and closer to natural light, reducing the user's visual fatigue and achieving an eye protection effect. In addition, the present application provides the second color conversion portion 20 separately from the first color conversion portion 112, and the second color conversion portion 20 is located outside the light-emitting component 10. After passing through the second color conversion portion 20, the light can be directly emitted toward the side away from the light-emitting component 10, thereby preventing the second light stimulated by the second color conversion portion 20 from being secondary absorbed in the first color conversion portion 112. This can improve the light extraction efficiency of the cyan light, thereby improving the light extraction efficiency and light extraction effect of the backlight module.

[0059] It can be understood that the second color conversion unit 20 can be configured to convert the first light into preset light, and the proportion of light within the first wavelength range in the first light is less than the proportion of light within the first wavelength range in the preset light; that is, the first light can be excited by the second color conversion material 21 to compensate for the proportion of light within the first wavelength range, and the proportion of light within the first wavelength range in the preset light can be increased.

[0060] In some embodiments, the second color conversion portion 20 includes a substrate layer 22 , and the second color conversion material 21 may be distributed in the substrate layer 22 .

[0061] The second color conversion material 21 may include first quantum dots 211 distributed in the substrate layer 22 , and the first quantum dots 211 are configured to absorb light emitted by the light emitting component 10 and stimulate the emission of second light.

[0062] In some embodiments, the first wavelength range may be 465 nm-515 nm, that is, the second light may be cyan light, and the half-peak width of the spectrum peak in the first wavelength range may be in the half-peak width range of 20 nm-70 nm.

[0063] In some embodiments, the material of the first quantum dot 211 may include cadmium sulfide (CdS), cadmium selenide (CdSe), indium phosphide (InP), indium arsenide (InAs), CsPbX3 (wherein X = Cl, Br, I or a combination thereof) and other materials; the particle size of the first quantum dot 211 can be controlled so that the first quantum dot 211 excites cyan light; for example, the particle size of the first quantum dot 211 can be greater than or equal to 3 nm and less than or equal to 5 nm; it can be understood that the first quantum dot 211 can contain at least one of the above-mentioned quantum dots.

[0064] In some embodiments, the material of the substrate layer 22 can be selected from at least one of polymethyl methacrylate, polyethylene terephthalate, polystyrene, polyethylene naphthalate, cycloolefin polymer and cycloolefin copolymer; further preferably, the material of the substrate layer 22 can be selected from at least one of polymethyl methacrylate, polyethylene terephthalate and polystyrene.

[0065] In a specific embodiment of the present application, Figure 2 As shown, the second color conversion portion 20 is a single-layer film structure, wherein the thickness of the substrate layer 22 ranges from 20 μm to 150 μm, preferably from 40 μm to 60 μm. The mass proportion of the second color conversion material 21 in the substrate layer 22 ranges from 5% to 45%, preferably from 20% to 30%.

[0066] In another specific embodiment of the present application, Figure 5 As shown, it is Figure 2The difference between the illustrated embodiments is that the second color conversion portion 20 can be a multi-layer film structure, and the second color conversion portion 20 also includes a barrier layer 23 arranged on at least one side of the substrate layer 22, and the barrier layer 23 can protect the substrate layer 22 and the second color conversion material 21 distributed in the substrate layer 22.

[0067] In some embodiments, the material of the barrier layer 23 can be selected from at least one of polymethyl methacrylate, polyethylene terephthalate, polystyrene, polyethylene naphthalate, cycloolefin polymer and cycloolefin copolymer; further preferably, the material of the barrier layer 23 can be selected from at least one of polyethylene terephthalate, polyethylene naphthalate, cycloolefin polymer and cycloolefin copolymer.

[0068] In some embodiments, the thickness of the barrier layer 23 ranges from 20 um to 200 um, preferably from 50 um to 100 um; the thickness of the substrate layer 22 ranges from 25 um to 125 um.

[0069] In some embodiments, the barrier layer 23 may include a first barrier layer 231 and a second barrier layer 232, and the first barrier layer 231 and the second barrier layer 232 are respectively located on opposite sides of the substrate layer 22; for example, the first barrier layer 231 can be located between the substrate layer 22 and the light-emitting component 10, and the second barrier layer 232 can be located on the side of the substrate layer 22 away from the light-emitting component 10, so as to improve the protection of the substrate layer 22 and the second color conversion material 21 distributed in the substrate layer 22.

[0070] In another specific embodiment of the present application, Figure 6 As shown, it is Figure 2 The difference between the illustrated embodiments is that the second color conversion portion 20 further includes a third color conversion material 24 distributed in the substrate layer 22. The third color conversion material 24 is configured to excite a third light ray. The proportion of light within the second wavelength range in the first light ray is less than the proportion of light within the second wavelength range in the third light ray, and the first wavelength range is not completely the same as the second wavelength range, that is, the first wavelength range and the second wavelength range do not overlap at least partially. The embodiment of the present application can further supplement the other color lights of the backlight module by adding other color conversion materials in the second color conversion portion 20, thereby further improving the continuity and light output effect of the light output spectrum of the backlight module.

[0071] In some embodiments, the third color conversion material 24 includes second quantum dots 241 distributed in the substrate layer 22, the particle size of the second quantum dots 241 is larger than the particle size of the first quantum dots 211, and the maximum value in the second wavelength range is larger than the maximum value in the first wavelength range. Further, the minimum value in the second wavelength range is larger than the maximum value in the first wavelength range.

[0072] In some embodiments, the second quantum dot 241 can be at least one of an orange quantum dot and a red quantum dot, and correspondingly, the second wavelength range can be 570nm-620nm (orange), 690nm-800nm ​​(deep red) or at least one of 570nm to 800nm; for example, when the second quantum dot 241 is an orange quantum dot, the third light is orange light; when the second quantum dot 241 is a red quantum dot, the third light is deep red light; when the third quantum dot is an orange quantum dot and a red quantum dot, the third light is a mixture of orange light and deep red light.

[0073] In some embodiments, when the second quantum dots 241 are orange quantum dots, the particle size of the second quantum dots 241 is in the range of 6 nm to 8 nm; when the second quantum dots 241 are red quantum dots, the particle size of the second quantum dots 241 is in the range of 7 nm to 9 nm.

[0074] It is understandable that the material of the second quantum dot 241 may include cadmium sulfide (CdS), cadmium selenide (CdSe), indium phosphide (InP), indium arsenide (InAs), CsPbX3 (wherein X = Cl, Br, I or a combination thereof) and other materials; that is, the material of the second quantum dot 241 may be the same as or different from the material of the first quantum dot 211, and the quantum dot can be controlled by controlling the particle size of the quantum dot to achieve the quantum dot excitation of light of different colors; it is understandable that the second quantum dot 241 may contain at least one of the above-mentioned quantum dots.

[0075] The manufacturing method of the second color conversion portion 20 in the embodiment of the present application can be: adding the second color conversion material 21 to the material of the substrate layer 22 and mixing them, then melting the mixed material, and then extruding and stretching it to form a film layer to obtain the second color conversion portion 20 distributed on the second color conversion material 21.

[0076] Below, this application provides Example 1 and Comparative Example 1 for Figure 5 The light output spectrum of the backlight module is verified.

[0077] In Example 1, the first quantum dots 211 are indium phosphide quantum dots, the material of the substrate layer 22 is polymethyl methacrylate, the thickness of the substrate layer 22 is 49 microns, and the mass proportion of the first quantum dots 211 in the substrate layer 22 is 22%; the material of the first barrier layer 231 and the second barrier layer 232 is polyethylene terephthalate, and the thickness of the first barrier layer 231 and the second barrier layer 232 are both 50 microns.

[0078] Among them, the absorption / fluorescence spectrum curve of indium phosphide quantum dots is as follows Figure 7As shown, it can be seen that the emission peak (PL) of indium phosphide quantum dots is 470nm, the half-maximum width (FWHM) is 44nm, and the quantum efficiency (QY) is 60%; it can effectively emit cyan light to compensate for the cyan light in the backlight module.

[0079] In Comparative Example 1, Figure 8 The backlight module structure shown in FIG. 1 is similar to the backlight module structure except that the second color conversion unit 20 is not provided. Figure 5 The backlight modules shown are identical.

[0080] The luminous spectra of the backlight modules in Example 1 and Comparative Example 1 were tested to obtain the following: Figure 9 The luminescence spectrum curve shown.

[0081] Among them, curve A1 is the luminous spectrum curve of the backlight module in Example 1, and curve B1 is the luminous spectrum curve of the backlight module in Comparative Example 1; it can be seen that the luminous spectrum in Example 1 has significantly more light in the 465nm-515nm band than that in Comparative Example 1, and the continuity and fluctuation of the luminous spectrum in Example 1 are less than those in Comparative Example 1, which shows that the backlight module provided in the embodiment of the present application can effectively supplement the cyan light, and can improve the continuity of the light output spectrum of the backlight module, so that the light output of the backlight module is closer to natural light, reducing the user's visual fatigue and achieving the eye protection effect.

[0082] In addition, please refer to Figure 10 An embodiment of the present application further provides a display device, which includes a display panel 40 and the backlight module described in the above embodiment. The display panel 40 is located on a side of the second color conversion portion 20 away from the light-emitting component 10.

[0083] In some embodiments, the display panel 40 may be located on a side of the optical film 30 away from the second color conversion unit 20 .

[0084] It is understandable that since the backlight module provided in the embodiment of the present application can effectively supplement the cyan light, so that the light emitted by the backlight module is closer to natural light, the display device containing the backlight module has a better eye protection effect.

[0085] As mentioned above, the present application provides Example 2, Comparative Example 2 and Comparative Example 3 to verify the white screen spectrum of the display device provided in the embodiment of the present application.

[0086] In Example 2, the display device structure is as follows Figure 10 As shown, the structure of the backlight module is the same as that of embodiment 1.

[0087] In Comparative Example 2, the display device structure is as follows Figure 11As shown, the structure of the backlight module is the same as that in comparative example 1.

[0088] In Comparative Example 3, a D65 light source is used as a backlight module to form a white screen spectrum, and the D65 light source is a standard lighting source with a color temperature of about 6500K that simulates natural daylight.

[0089] The luminous spectra of the backlight modules in Example 2, Comparative Example 2 and Comparative Example 3 were tested to obtain the following: Figure 12 The luminescence spectrum curve shown.

[0090] Curve A2 is the spectral curve of the white screen in Example 2, Curve B2 is the spectral curve of the white screen in Comparative Example 2, and Curve C is the spectral curve of the white screen in Example 3; wherein, the natural light-like index of the display device in Comparative Example 2 is 27%, while the natural light-like index of the display device in Example 2 is 51%.

[0091] By Figure 12 It can be seen that the continuity of the white screen spectral curve of the display device provided in the embodiment of the present application is better than that in Comparative Example 2, and is closer to the spectral curve in Comparative Example 3; that is, the second color conversion unit 20 added in the embodiment of the present application can make the light emitted by the display device closer to natural light, which is more conducive to eye protection.

[0092] In summary, the embodiment of the present application adds a second color conversion portion 20 to the light-emitting side of the light-emitting component 10, and the second color conversion portion 20 contains a second color conversion material 21. The second color conversion material 21 can excite a larger proportion of light within the first wavelength range in the second light, and thus can supplement the light within the first wavelength range in the first light, so that the continuity of the light-emitting spectrum of the backlight module is better, closer to natural light, reducing the user's visual fatigue, and achieving an eye protection effect; in addition, the present application separates the second color conversion portion 20 from the first color conversion portion 112, and the second color conversion portion 20 is located outside the light-emitting component 10, thereby avoiding the second light excited by the second color conversion portion 20 from being absorbed twice in the first color conversion portion 112, thereby improving the light extraction efficiency of the light within the first wavelength range, and thus improving the light extraction efficiency and light extraction effect of the backlight module.

[0093] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0094] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0096] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A backlight module, characterized in that: include: A light-emitting assembly comprising at least one light-emitting element, the light-emitting element comprising a light source and a first color conversion portion, the first color conversion portion being located on a light-emitting side of the light source and configured to convert light emitted by the light source into a first light beam; a second color conversion portion, disposed on a light-emitting side of the light-emitting component, the second color conversion portion comprising a second color conversion material, and the second color conversion material is configured to excite a second light; The proportion of light within the first wavelength range in the first light is smaller than the proportion of light within the first wavelength range in the second light.

2. The backlight module according to claim 1, wherein: The second color conversion portion includes a substrate layer, the second color conversion material includes first quantum dots distributed in the substrate layer, and the first wavelength range is 465 nm-515 nm.

3. The backlight module according to claim 2, wherein: The second color conversion portion further includes a barrier layer disposed on at least one side of the substrate layer, and the material of the substrate layer and the barrier layer are selected from at least one of polymethyl methacrylate, polyethylene terephthalate, polystyrene, polyethylene naphthalate, cycloolefin polymer and cycloolefin copolymer.

4. The backlight module according to claim 2, wherein: The second color conversion portion further includes a third color conversion material distributed in the substrate layer, the third color conversion material being configured to excite a third light, and a proportion of light within the second wavelength range in the first light being smaller than a proportion of light within the second wavelength range in the third light.

5. The backlight module according to claim 4, wherein: The third color conversion material includes second quantum dots distributed in the substrate layer, the particle size of the second quantum dots is larger than the particle size of the first quantum dots, and the maximum value in the second wavelength range is larger than the maximum value in the first wavelength range.

6. The backlight module according to any one of claims 1 to 5, characterized in that: The second color conversion portion partially overlaps with the light emitting element along a thickness direction of the backlight module, and the second color conversion portion is located on a side of the first color conversion portion away from the light source.

7. The backlight module according to any one of claims 1 to 5, characterized in that: The light-emitting component includes a light guide plate, which includes a first surface and a second surface arranged opposite to each other, and a side surface connected between the first surface and the second surface. The light-emitting component is arranged on the side surface of the light guide plate, and the light-emitting side of the light-emitting component faces the side surface of the light guide plate. The second color conversion portion is arranged on the first surface side or the second surface side of the light guide plate.

8. The backlight module according to any one of claims 1 to 5, characterized in that: The first color conversion portion includes an encapsulation layer and a first color conversion material. The encapsulation layer covers the light source, and the first color conversion material is distributed in the encapsulation layer.

9. The backlight module according to any one of claims 1 to 5, characterized in that: The backlight module further includes a plurality of optical films, which are arranged between the second color conversion portion and the light-emitting component, and / or are arranged on a side of the second color conversion portion away from the light-emitting component.

10. A display device, characterized in that: The display device includes a display panel and the backlight module according to any one of claims 1 to 9, wherein the display panel is located on a side of the second color conversion portion away from the light-emitting component.

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