Backlight module and display device

Abstract

The invention relates to a backlight module and a display device. The backlight module comprises a light source, a fluorescent powder layer and a quantum dot color conversion layer. The light source is configured to emit blue light and ultraviolet light. The fluorescent powder layer is located on a light emitting path of the light source and comprises red fluorescent powder and green fluorescent powder. The quantum dot color conversion layer is located on a light emitting path of the light source and comprises yellow light quantum dots and blue light quantum dots. Thus, when the backlight module emits visible light of five different colors, the conversion efficiency of red light, green light, yellow light and cyan light generated by the fluorescent powder layer and the quantum dot color conversion layer in the backlight module can be considered at the same time, and the power consumption of the backlight module can be reduced.

Description

Technical Field

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

[0002] In recent years, quantum dots have been widely used in backlight and display fields. When quantum dots are stimulated by light sources, they will generate excitation light under the action of the light source. At present, blue light is usually used as a light source to excite quantum dots. However, some quantum dots have a low conversion efficiency when generating excitation light under the action of blue light. Summary of the invention

[0003] The embodiments of the present application provide a backlight module and a display device, taking into account the conversion efficiency of the phosphor layer and the quantum dot color conversion layer in the backlight module, so as to at least partially solve the above technical problems.

[0004] In order to achieve the above object, according to a first aspect of the present application, a backlight module is provided, comprising:

[0005] a light source configured to emit blue light and ultraviolet light;

[0006] a phosphor layer, located on the light emitting path of the light source, and comprising red phosphor and green phosphor; and

[0007] The quantum dot color conversion layer is located on the light output path of the light source and includes yellow light quantum dots and cyan light quantum dots.

[0008] Optionally, the light source includes a first light emitting unit and a second light emitting unit, the first light emitting unit is configured to emit blue light, and the second light emitting unit is configured to emit ultraviolet light.

[0009] Optionally, the first light-emitting unit includes a first blue light-emitting unit and a second blue light-emitting unit, the first blue light-emitting unit is configured to emit blue light having a first blue light peak wavelength, the second blue light-emitting unit is configured to emit blue light having a second blue light peak wavelength, and the first blue light peak wavelength is greater than the second blue light peak wavelength.

[0010] Optionally, in the light source, the number of the first blue light emitting units is different from the number of the second blue light emitting units.

[0011] Optionally, a difference between the first blue light peak wavelength and the second blue light peak wavelength is greater than or equal to 10 nm.

[0012] Optionally, the phosphor layer is located on the light emitting surface of the light source; the backlight module further comprises a light-transmitting plate, the light-transmitting plate is located on the light emitting path of the light source, and the quantum dot color conversion layer is located on the light-transmitting plate.

[0013] Optionally, the yellow light quantum dots and the cyan light quantum dots include the same quantum dot material, and the particle size of the yellow light quantum dots is larger than that of the cyan light quantum dots.

[0014] According to a second aspect of the present application, a display device is provided, comprising the above-mentioned backlight module and a liquid crystal display panel. The liquid crystal display panel is located on the light-emitting side of the backlight module and comprises a red filter unit, a blue filter unit, a green filter unit, a yellow filter unit and a cyan filter unit.

[0015] Optionally, the transmission spectrum of the liquid crystal display panel has a maximum transmittance wavelength for red light, a maximum transmittance wavelength for blue light, a maximum transmittance wavelength for green light, a maximum transmittance wavelength for yellow light and a maximum transmittance wavelength for cyan light; the maximum transmittance wavelength for red light is 628nm~632nm, the maximum transmittance wavelength for blue light is 455nm~458nm, the maximum transmittance wavelength for green light is 518nm~522nm, the maximum transmittance wavelength for yellow light is 570nm~575nm, and the maximum transmittance wavelength for cyan light is 485nm~490nm.

[0016] Optionally, the color coordinates of the light emitted by the display device are located within the pentagonal area defined by the red point (0.6798, 0.3185), the yellow point (0.4945, 0.5574), the green point (0.2870, 0.6507), the blue point (0.1513, 0.0643) and the cyan point (0.1199, 0.37) in the CIE 1931xy chromaticity diagram.

[0017] In the backlight module and display device of the embodiment of the present application, blue light is used to excite the red light phosphor and the green light phosphor in the phosphor layer to emit red light and green light, thereby improving the conversion efficiency of the phosphor layer to convert blue light into red light and green light. In addition, blue light and ultraviolet light with a shorter wavelength are used to jointly excite the yellow light quantum dots and the cyan light quantum dots to emit yellow light and cyan light. Since the absorption rate of the yellow light quantum dots and the cyan light quantum dots to ultraviolet light with a shorter wavelength is greater than the absorption rate to blue light, and the conversion efficiency of the yellow light quantum dots and the cyan light quantum dots to produce yellow light and cyan light under the excitation of ultraviolet light is also higher, the conversion efficiency of the yellow light quantum dots and the cyan light quantum dots to absorb blue light and ultraviolet light to produce yellow light and cyan light is improved. In this way, while the backlight module emits five different colors of visible light, it can also take into account the conversion efficiency of the phosphor layer and the quantum dot color conversion layer in the backlight module to produce red light, green light, yellow light and cyan light, which is conducive to reducing the power consumption of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic cross-sectional structure diagram of a backlight module provided in an exemplary embodiment of the present application;

[0019] Figure 2 A schematic diagram of a planar structure of a light source provided in an exemplary embodiment of the present application;

[0020] Figure 3 Another schematic diagram of a planar structure of a light source provided in an exemplary embodiment of the present application;

[0021] Figure 4 This is another schematic diagram of a planar structure of a light source provided in an exemplary embodiment of the present application;

[0022] Figure 5 A schematic cross-sectional structure diagram of a light source provided in an exemplary embodiment of the present application;

[0023] Figure 6 Another schematic cross-sectional structure diagram of a light source provided in an exemplary embodiment of the present application;

[0024] Figure 7 A schematic diagram of the structure of a display device provided in an exemplary embodiment of the present application;

[0025] Figure 8 A schematic diagram of the structure of a liquid crystal display panel provided in an exemplary embodiment of the present application;

[0026] Fig. 9 A schematic diagram of a transmission spectrum of a liquid crystal display panel provided in an exemplary embodiment of the present application;

[0027] Fig.10 Schematic diagram of CIE1931 chromaticity coordinates of light emitted by a display device provided in an exemplary embodiment of the present application.

[0028] Description of reference numerals:

[0029] 100. backlight module; 300. display device;

[0030] 11. light source; 110. light emitting unit;

[0031] 111, a first light emitting unit; 112, a first blue light emitting unit; 113, a second blue light emitting unit;

[0032] 114. A second light emitting unit;

[0033] 12. phosphor layer; 121. red phosphor; 122. green phosphor; 123. first light-transmitting base layer;

[0034] 13. quantum dot color conversion layer; 131. yellow light quantum dots; 132. cyan light quantum dots; 133. second light-transmitting base layer;

[0035] 141. light-transmitting plate; 142. optical film;

[0036] 151. a first ultraviolet light absorbing layer; 152. a first ultraviolet light absorbing layer;

[0037] 16. Reflector;

[0038] 200. Liquid crystal display panel;

[0039] 21. Array substrate;

[0040] 22. Counter substrate;

[0041] 23. Liquid crystal layer;

[0042] 241, a red filter unit; 242, a blue filter unit; 243, a green filter unit; 244, a yellow filter unit; 245, a cyan filter unit. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all 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.

[0044] According to the first aspect of the present application, referring to Figure 1 As shown, the embodiment of the present application provides a backlight module 100. The backlight module 100 can be a direct-lit backlight module or an edge-lit backlight module.

[0045] The backlight module 100 includes a light source 11, a phosphor layer 12, and a quantum dot color conversion layer 13. The light source 11 is configured to emit blue light and ultraviolet light. The phosphor layer 12 is located on the light output path of the light source 11. The phosphor layer 12 includes a red phosphor 121 and a green phosphor 122. The quantum dot color conversion layer 13 is located on the light output path of the light source 11. The quantum dot color conversion layer 13 includes yellow quantum dots 131 and cyan quantum dots 132.

[0046] In the backlight module 100 of the embodiment of the present application, blue light is used to excite the red phosphor 121 and the green phosphor 122 in the phosphor layer 12 to emit red light and green light, so as to improve the conversion efficiency of the phosphor layer 12 in converting blue light into red light and green light. In addition, the red phosphor 121 has better high temperature resistance than red light quantum dots, and the green phosphor 122 has better high temperature resistance than green light quantum dots, so that the distance between the phosphor layer 12 and the light source 11 can be closer, thereby improving the conversion efficiency of the phosphor layer 12 in converting blue light into red light and green light.

[0047] Furthermore, blue light and ultraviolet light with a shorter wavelength are used to jointly excite the yellow light quantum dots 131 and the cyan light quantum dots 132 to emit yellow light and cyan light. Since the yellow light quantum dots 131 and the cyan light quantum dots 132 have a greater absorption rate for ultraviolet light with a shorter wavelength than for blue light, and the conversion efficiency of the yellow light quantum dots 131 and the cyan light quantum dots 132 to produce yellow light and cyan light under the excitation of ultraviolet light is also higher, the conversion efficiency of the yellow light quantum dots 131 and the cyan light quantum dots 132 to produce yellow light and cyan light by absorbing the blue light and ultraviolet light emitted by the light source 11 is improved.

[0048] Therefore, by adopting the above design, the backlight module 100 can not only emit red light, green light, blue light, yellow light and cyan light, that is, emit five different colors of visible light, but also simultaneously take into account the conversion efficiency of the phosphor layer 12 and the quantum dot color conversion layer 13 in the backlight module 100 to produce red light, green light, yellow light and cyan light, which is beneficial to reducing the power consumption of the backlight module 100.

[0049] In some embodiments, reference Figure 1 As shown, the backlight module 100 may further include a reflective plate 16, and the light source 11 may be located on the reflective plate 16. In other embodiments, the backlight module 100 may further include a circuit board, and the light source 11 may be located on the circuit board.

[0050] In some embodiments, reference Figures 2 to 6 As shown, the light source 11 includes a first light emitting unit 111 and a second light emitting unit 114. The first light emitting unit 111 is configured to emit blue light, and the second light emitting unit 114 is configured to emit ultraviolet light. In this way, the light source 11 can emit blue light and ultraviolet light.

[0051] In some embodiments, reference Figure 2 , Figure 3 as well as Figure 5 As shown, the first light-emitting unit 111 and the second light-emitting unit 114 can be integrated into one light-emitting unit 110, that is, one light-emitting unit 110 includes the first light-emitting unit 111 and the second light-emitting unit 114, and the first light-emitting unit 111 and the second light-emitting unit 114 are arranged adjacent to each other. The light source 11 includes a plurality of light-emitting units 110 that are spaced apart from each other and arranged in an array. In this way, the first light-emitting unit 111 serves as a visible light source, and the second light-emitting unit 114 serves as an invisible light source, and the visible light source and the invisible light source are integrated into one light-emitting unit 110. Each of the plurality of light-emitting units 110 that are spaced apart from each other emits ultraviolet light and blue light, thereby improving the brightness uniformity of the light emitted by the backlight module 100, which is beneficial to improving the uniformity of the display brightness of the display device including the backlight module. Exemplarily, the first light-emitting unit 111 and the second light-emitting unit 114 are integrated into one light-emitting chip.

[0052] In other embodiments, referring to Figure 4 and Figure 6 As shown, the first light emitting unit 111 can be spaced apart from the second light emitting unit 114. The first light emitting unit 111 and the second light emitting unit 114 are not integrated into one light emitting unit 110, but are two independent light emitting units. The light source 11 includes a plurality of first light emitting units 111 and a plurality of second light emitting units 114 that are independent of each other. In this way, the first light emitting unit 111 and the second light emitting unit 114 do not need to be integrated together, which simplifies the manufacturing process of the light source 11.

[0053] In some embodiments, any one of the first light emitting unit 111 and the second light emitting unit 114 may be any one of an inorganic light emitting diode (LED), a micro light emitting diode (Micro-LED), a sub-millimeter light emitting diode (mini-LED), and an organic light emitting diode. Exemplarily, both the first light emitting unit 111 and the second light emitting unit 114 are inorganic light emitting diodes (LED).

[0054] In some embodiments, reference Figure 2 As shown, the plurality of first light emitting units 111 emit blue light of the same wavelength. In this way, the types of light emitting units 110 in the light source 11 are reduced, and the manufacturing process of the light source 11 is simplified.

[0055] In some embodiments, reference Figures 3 to 6 As shown, the first light emitting unit 111 includes a first blue light emitting unit 112 and a second blue light emitting unit 113. The first blue light emitting unit 112 is configured to emit blue light having a first blue light peak wavelength. The second blue light emitting unit 113 is configured to emit blue light having a second blue light peak wavelength. The first blue light peak wavelength is greater than the second blue light peak wavelength.

[0056] The cyan quantum dots 132 have a higher absorption rate for blue light with a shorter wavelength, while the yellow quantum dots 131 have a higher absorption rate for blue light with a longer wavelength. That is, the cyan quantum dots 132 and the yellow quantum dots 131 have differences in the absorption of blue light of different wavelengths. The first blue light peak wavelength is greater than the second blue light peak wavelength, so that the blue light emitted by the first blue light emitting unit 112 has a larger proportion of blue light with a longer wavelength, while the blue light emitted by the second blue light emitting unit 113 has a larger proportion of blue light with a shorter wavelength. The cyan quantum dots 132 have a greater absorption rate for the blue light with a shorter wavelength emitted by the second blue light emitting unit 113, further improving the conversion efficiency of the cyan quantum dots 132 in converting blue light into cyan light. The yellow quantum dots 131 have a greater absorption rate for the blue light with a longer wavelength emitted by the first blue light emitting unit 112, further improving the conversion efficiency of the yellow quantum dots 131 in converting blue light into yellow light. In other words, some embodiments of the present application select two blue light units that emit blue light with different peak wavelengths based on the difference in blue light absorption between the yellow light quantum dots 131 and the cyan light quantum dots 132 , so as to further improve the conversion efficiency of the cyan light quantum dots 132 and the yellow light quantum dots 131 .

[0057] In some embodiments, the difference between the first blue light peak wavelength and the second blue light peak wavelength is greater than or equal to 10nm. In this way, the difference between the first blue light peak wavelength and the second blue light peak wavelength is large, so that at least one of the first blue light emitting unit 112 can emit more blue light with a longer wavelength and the second blue light emitting unit 113 can emit more blue light with a shorter wavelength, further improving the absorption rate of the cyan light quantum dots 132 to the blue light with a shorter wavelength emitted by the second blue light emitting unit 113, and / or improving the absorption rate of the yellow light quantum dots 131 to the blue light with a longer wavelength emitted by the first blue light emitting unit 112. Optionally, the difference between the first blue light peak wavelength and the second blue light peak wavelength is greater than or equal to 20nm.

[0058] In some embodiments, the peak wavelength of the first blue light is 435nm to 445nm. The yellow light quantum dot 131 has a greater absorption rate for blue light with a wavelength of 435nm to 445nm, further improving the absorption rate of the yellow light quantum dot 131 for the blue light emitted by the first blue light emitting unit 112, and improving the conversion efficiency of the yellow light quantum dot 131 in converting blue light into yellow light.

[0059] The first blue light peak wavelength may be any value between 435 nm and 445 nm. For example, the first blue light peak wavelength is 435 nm, 440 nm or 445 nm.

[0060] In some embodiments, the second blue light peak wavelength is 415nm to 425nm. The cyan quantum dot 132 has a greater absorption rate for blue light with a wavelength of 415nm to 425nm, further improving the absorption rate of the cyan quantum dot 132 for the blue light with a shorter wavelength emitted by the second blue light emitting unit 113, and improving the conversion efficiency of the cyan quantum dot 132 from blue light to cyan light.

[0061] The second blue light peak wavelength may be any value between 415 nm and 425 nm. For example, the second blue light peak wavelength is 415 nm, 420 nm or 425 nm.

[0062] In some embodiments, in the light source 11, the number of the first blue light emitting units 112 is different from the number of the second blue light emitting units 113. Thus, by differentially designing the number of the first blue light emitting units 112 and the number of the second blue light emitting units 113, the amount of blue light emitted by the first blue light emitting unit 112 and the second blue light emitting unit 113 is adjusted respectively, so as to more flexibly adjust the luminous intensity of the cyan light generated by the cyan light quantum dots 132 being excited and the luminous intensity of the yellow light generated by the yellow light quantum dots 131 being excited.

[0063] In some embodiments, reference Figure 4 As shown, the number of the first blue light emitting units 112 is less than the number of the second blue light emitting units 113. The second blue light emitting units 113 with a larger number emit more blue light with a shorter wavelength, and the cyan quantum dots 132 absorb more blue light with a shorter wavelength and generate cyan light with a greater intensity.

[0064] In some embodiments, the number of first blue light emitting units 112 is greater than the number of second blue light emitting units 113. A larger number of first blue light emitting units 112 emits more blue light with a longer wavelength, and the yellow light quantum dots 131 absorb more blue light with a longer wavelength and generate yellow light with a greater intensity.

[0065] In other embodiments, referring to Figure 3 As shown, in the light source 11 , the number of the first blue light emitting units 112 and the number of the second blue light emitting units 113 may also be the same.

[0066] In some embodiments, reference Figures 3 to 6 As shown, the first blue light emitting unit 112 and the second blue light emitting unit 113 can be integrated into one light emitting unit 110. In this way, the different blue lights emitted by the first blue light emitting unit 112 and the second blue light emitting unit 113 can be mixed, and the mixed blue light can better excite the phosphor layer 12 to generate red light and green light.

[0067] In some embodiments, one of the first blue light emitting unit 112 and the second blue light emitting unit 113 can be integrated with the second blue light emitting unit 114 into one light emitting unit 110. In this way, the brightness uniformity of the light emitted by the backlight module is improved.

[0068] In some embodiments, reference Figure 1 , Figure 5 as well as Figure 6 As shown, the phosphor layer 12 is located on the light emitting surface of the light source 11. In this way, the distance between the phosphor layer 12 and the light source 11 is relatively close, which increases the amount of blue light received by the phosphor layer 12 and improves the conversion efficiency of the phosphor layer 12 in converting blue light into red light and green light. Exemplarily, the phosphor layer 12 covers the light emitting surface and the side surface of the light source 11.

[0069] In some embodiments, reference Figure 1 and Figure 5 As shown, when the first light-emitting unit 111 and the second light-emitting unit 114 are integrated into one light-emitting unit 110 , the phosphor layer 12 can be located on the light-emitting surfaces of the first light-emitting unit 111 and the second light-emitting unit 114 .

[0070] In some embodiments, when the first light emitting unit 111 and the second light emitting unit 114 are arranged at intervals, the phosphor layer 12 may be located on the light emitting surface of the first light emitting unit 111 .

[0071] In some embodiments, reference Figure 6 As shown, when the first light-emitting unit 111 includes the first blue light-emitting unit 112 and the second blue light-emitting unit 113 , the phosphor layer 12 is located on the light-emitting surface of the first blue light-emitting unit 112 and the light-emitting surface of the second blue light-emitting unit 113 .

[0072] In some embodiments, reference Figure 1 , Figure 5 as well as Figure 6 As shown, the phosphor layer 12 further includes a first light-transmitting base layer 123, in which the red phosphor 121 and the green phosphor 122 are dispersed. The first light-transmitting base layer 123 may include organic materials such as epoxy resin.

[0073] In some embodiments, the red phosphor 121 may be a phosphor material having an emission peak wavelength of 590 nm to 680 nm. For example, the red phosphor 121 includes but is not limited to K2SiF6:Mn 4+ (KSF).

[0074] In some embodiments, the green phosphor 122 may be a material having an emission peak wavelength of 525 nm to 545 nm. The green phosphor 122 includes but is not limited to β-SiAlON:Eu2+ .

[0075] In some embodiments, reference Figure 1 As shown, the backlight module 100 also includes a light-transmitting plate 141, which is located on the light-emitting path of the light source 11, and the quantum dot color conversion layer 13 is located on the light-transmitting plate 141. In this way, the light-transmitting plate 141 not only plays a role in guiding light, but also plays a role in supporting and protecting the quantum dot color conversion layer 13. In addition, the quantum dot color conversion layer 13 is located on the light-transmitting plate 141, so that there is a suitable distance between the quantum dot color conversion layer 13 and the light source 11, which improves the stability of the yellow light quantum dots 131 and the cyan light quantum dots 132 in the quantum dot color conversion layer 13, and can also ensure the absorption rate of the yellow light quantum dots 131 and the cyan light quantum dots 132 to blue light and ultraviolet light, thereby ensuring the conversion efficiency of the yellow light quantum dots 131 and the cyan light quantum dots 132 in converting blue light and ultraviolet light into yellow light and cyan light.

[0076] It should be noted that the temperature of the light source 11 is relatively high during operation, while the high temperature resistance of the quantum dots is relatively poor. If the distance between the quantum dots and the light source 11 is too close, it is not conducive to improving the stability of the quantum dots. If the distance between the quantum dots and the light source 11 is too far, it is not conducive to improving the absorption rate of the quantum dots to the light emitted by the light source 11.

[0077] In some embodiments, reference Figure 1 As shown, the light-transmitting plate 141 may include a diffusion plate, the diffusion plate is located above the light source 11, and the quantum dot color conversion layer 13 is located on the surface of the diffusion plate away from the light source 11. In this way, the diffusion plate can better protect the quantum dot color conversion layer 13, further reducing the risk of damage to the quantum dot color conversion layer 13. Among them, when the backlight module 100 includes a diffusion plate and the diffusion plate is located above the light source 11, the backlight module 100 is a direct-type backlight module.

[0078] In some embodiments, the light-transmitting plate 141 may include a light guide plate, and the light-emitting surface of the light source 11 faces the light-incoming surface of the light guide plate. The quantum dot color conversion layer 13 is located on the light-emitting surface of the light guide plate. In this way, the light guide plate better protects the quantum dot color conversion layer 13, further reducing the risk of damage to the quantum dot color conversion layer 13. Among them, when the backlight module 100 includes a light guide plate, the backlight module 100 is a side-entry backlight module.

[0079] In some embodiments, reference Figure 1 As shown, the quantum dot color conversion layer 13 further includes a second light-transmitting base layer 133. The yellow light quantum dots 131 and the cyan light quantum dots 132 are dispersed in the second light-transmitting base layer 133. The second light-transmitting base layer 133 may include an organic material.

[0080] In some embodiments, the peak wavelength of the yellow light generated by the yellow light quantum dots 131 absorbing the blue light and the ultraviolet light may be 570 nm to 590 nm.

[0081] In some embodiments, the peak wavelength of cyan light generated by the cyan quantum dots 132 absorbing blue light and ultraviolet light may be 470 nm to 490 nm.

[0082] In some embodiments, the yellow quantum dots 131 and the cyan quantum dots 132 may include the same quantum dot material, and the particle size of the yellow quantum dots 131 is larger than the particle size of the cyan quantum dots 132. In this way, the yellow quantum dots 131 and the cyan quantum dots 132 are prepared using the same quantum dot material with different particle sizes. In other embodiments, the yellow quantum dots 131 and the cyan quantum dots 132 may also include different quantum dot materials.

[0083] In some embodiments, both the yellow quantum dots 131 and the cyan quantum dots 132 include but are not limited to Cd—Se materials.

[0084] In some embodiments, the particle size of the yellow light quantum dot 131 is 3.5nm to 4.5nm, and the particle size of the cyan light quantum dot 132 is 2nm to 3nm. In this way, the manufacturing difficulty of the yellow light quantum dot 131 and the cyan light quantum dot 132 is reduced, while ensuring that the yellow light quantum dot 131 can generate yellow light when excited by ultraviolet light and blue light, and the cyan light quantum dot 132 can generate cyan light when excited by ultraviolet light and blue light.

[0085] In some embodiments, reference Figure 1 As shown, the backlight module 100 further includes an optical film 142. The optical film 142 is located on one side of the light-transmitting plate 141. The optical film 142 further processes the light emitted from the light-transmitting plate 141 to improve the optical performance of the light emitted by the backlight module 100. The optical film 142 may include but is not limited to at least one of a brightness enhancement film and a diffusion film.

[0086] In some embodiments, when the backlight module 100 further includes an optical film 142 and a light-transmitting plate 141 , the quantum dot color conversion layer 13 may be located between the optical film 142 and the light-transmitting plate 141 , and located on the surface of the light-transmitting plate 141 .

[0087] In some embodiments, reference Figure 1 As shown, the backlight module 100 may further include a first ultraviolet light absorbing layer 151 , and the first ultraviolet light absorbing layer 151 is configured to absorb ultraviolet light emitted by the backlight module 100 to reduce the risk of ultraviolet light causing harm to the user.

[0088] In some embodiments, the first ultraviolet light absorbing layer 151 may be located on a side of the optical film 142 away from the light-transmitting plate 141. Thus, the first ultraviolet light absorbing layer 151 may absorb ultraviolet light emitted from the optical film 142 to fully absorb ultraviolet light emitted by the backlight module 100.

[0089] In some embodiments, the first ultraviolet light absorbing layer 151 may include an organic light-transmitting layer and an ultraviolet light absorber dispersed in the organic light-transmitting layer. The ultraviolet light absorber may include, but is not limited to, phenyl o-hydroxybenzoate and the like.

[0090] Based on the same inventive concept, according to the second aspect of the present application, referring to Figures 7 and 8 As shown, the embodiment of the present application also provides a display device 300. The display device 300 includes the above-mentioned backlight module 100 and a liquid crystal display panel 200. The liquid crystal display panel 200 is located on the light-emitting side of the backlight module 100. The liquid crystal display panel 200 includes a red filter unit 241, a blue filter unit 242, a green filter unit 243, a yellow filter unit 244 and a cyan filter unit 245. In this way, after the five different colors of visible light emitted by the backlight module 100 are filtered by the five different color filter units inside the liquid crystal display panel 200, the display device 300 can not only emit white light, but also has a high color gamut.

[0091] In some embodiments, reference Figure 8 As shown, the liquid crystal display panel 200 may include an array substrate 21, an opposing substrate 22, and a liquid crystal layer 23. The liquid crystal layer 23 is located between the array substrate 21 and the opposing substrate 22. The red filter unit 241, the blue filter unit 242, the green filter unit 243, the yellow filter unit 244, and the cyan filter unit 245 may be located on one of the array substrate 21 and the opposing substrate 22 at the same time. Exemplarily, the red filter unit 241, the blue filter unit 242, the green filter unit 243, the yellow filter unit 244, and the cyan filter unit 245 are located on the surface of the opposing substrate 22 facing the array substrate 21.

[0092] In some embodiments, reference Fig. 9 As shown, the transmission spectrum of the liquid crystal display panel 200 has a red light maximum transmittance wavelength, a blue light maximum transmittance wavelength, a green light maximum transmittance wavelength, a yellow light maximum transmittance wavelength, and a cyan light maximum transmittance wavelength. The red light maximum transmittance wavelength is 628nm to 632nm, the blue light maximum transmittance wavelength is 455nm to 458nm, the green light maximum transmittance wavelength is 518nm to 522nm, the yellow light maximum transmittance wavelength is 570nm to 575nm, and the cyan light maximum transmittance wavelength is 485nm to 490nm. In this way, the display device 300 is guaranteed.

[0093] The red light maximum transmittance wavelength is the wavelength corresponding to the red light with the highest transmittance among the red lights transmitted from the liquid crystal display panel 200. The blue light maximum transmittance wavelength, the green light maximum transmittance wavelength, the yellow light maximum transmittance wavelength and the cyan light maximum transmittance wavelength can be deduced in the same manner and will not be explained in detail here.

[0094] In some embodiments, reference Fig.10 As shown, the color coordinates of the light emitted by the display device 300 are located in the pentagonal area defined by the red color point (0.6798, 0.3185), the yellow color point (0.4945, 0.5574), the green color point (0.2870, 0.6507), the blue color point (0.1513, 0.0643) and the cyan color point (0.1199, 0.37) in the CIE1931xy chromaticity diagram. In this way, the color gamut of the display device 300 is increased, and the display effect of the display device 300 is improved.

[0095] In some embodiments, reference Figure 7 As shown, the display device 300 may further include a second ultraviolet light absorbing layer 152, which is located on a side of the liquid crystal display panel 200 away from the backlight module 100. The second ultraviolet light absorbing layer 152 is configured to absorb ultraviolet light emitted from the liquid crystal display panel 200 to reduce the risk of ultraviolet light causing harm to the user.

[0096] In some embodiments, the second ultraviolet light absorbing layer 152 includes an ultraviolet light absorber, and the mass percentage of the ultraviolet light absorber in the second ultraviolet light absorbing layer 152 may be greater than the mass percentage of the ultraviolet light absorber in the first ultraviolet light absorbing layer 151. In this way, it is ensured that the second ultraviolet light absorbing layer 152 can more fully absorb the ultraviolet light emitted from the liquid crystal display panel 200, further reducing the risk of ultraviolet light causing harm to the user.

[0097] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0098] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0100] The above are only 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 source configured to emit blue light and ultraviolet light; A phosphor layer, located on the light emitting path of the light source, and comprising red phosphor and green phosphor; as well as The quantum dot color conversion layer is located on the light output path of the light source and includes yellow light quantum dots and cyan light quantum dots.

2. The backlight module according to claim 1, characterized in that: The light source includes a first light emitting unit and a second light emitting unit, the first light emitting unit is configured to emit blue light, and the second light emitting unit is configured to emit ultraviolet light.

3. The backlight module according to claim 2, characterized in that: The first light emitting unit includes a first blue light emitting unit and a second blue light emitting unit, the first blue light emitting unit is configured to emit blue light with a first blue light peak wavelength, the second blue light emitting unit is configured to emit blue light with a second blue light peak wavelength, and the first blue light peak wavelength is greater than the second blue light peak wavelength.

4. The backlight module according to claim 3, characterized in that: In the light source, the number of the first blue light emitting units is different from the number of the second blue light emitting units.

5. The backlight module according to claim 3, characterized in that: A difference between the first blue light peak wavelength and the second blue light peak wavelength is greater than or equal to 10 nm.

6. The backlight module according to claim 1, characterized in that: The phosphor layer is located on the light emitting surface of the light source; the backlight module further comprises a light-transmitting plate, the light-transmitting plate is located on the light emitting path of the light source, and the quantum dot color conversion layer is located on the light-transmitting plate.

7. The backlight module according to claim 6, characterized in that: The yellow light quantum dots and the cyan light quantum dots include the same quantum dot material, and the particle size of the yellow light quantum dots is larger than that of the cyan light quantum dots.

8. A display device, characterized in that: include: The backlight module according to any one of claims 1 to 7; The liquid crystal display panel is located at the light-emitting side of the backlight module and includes a red filter unit, a blue filter unit, a green filter unit, a yellow filter unit and a cyan filter unit.

9. The display device according to claim 8, characterized in that The transmission spectrum of the liquid crystal display panel has a maximum transmittance wavelength for red light, a maximum transmittance wavelength for blue light, a maximum transmittance wavelength for green light, a maximum transmittance wavelength for yellow light and a maximum transmittance wavelength for cyan light; the maximum transmittance wavelength for red light is 628nm~632nm, the maximum transmittance wavelength for blue light is 455nm~458nm, the maximum transmittance wavelength for green light is 518nm~522nm, the maximum transmittance wavelength for yellow light is 570nm~575nm, and the maximum transmittance wavelength for cyan light is 485nm~490nm.

10. The display device according to claim 8, characterized in that The color coordinates of the light emitted by the display device are located in the pentagonal area defined by the red color point (0.6798, 0.3185), the yellow color point (0.4945, 0.5574), the green color point (0.2870, 0.6507), the blue color point (0.1513, 0.0643) and the cyan color point (0.1199, 0.37) in the CIE 1931xy chromaticity diagram.

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