Backlight module and display device

Abstract

The application discloses a backlight module and a display device, and relates to the technical field of display. Since part of the light rays of the first color emitted by the light-emitting diode can be converted into light rays of the second color by the color conversion structure, the light rays emitted by the backlight module are combined light rays of the light rays of the first color and the light rays of the second color. That is, the backlight module realizes light emission by the combination of the light-emitting diode and the color conversion structure, so that the color gamut of the backlight module can be improved, the color gamut of the display device is further improved, and the display effect of the display device is ensured. Meanwhile, since the color conversion structure is located in the first accommodating groove of the substrate, that is, embedded in the interior of the substrate, the overall thickness of the backlight module can be reduced, the thinning of the display device is facilitated, and the competitiveness of the display device in the display field is improved.

Description

TECHNICAL FIELD

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

[0002] A liquid crystal display (LCD) display device includes a liquid crystal display module and a backlight module, the backlight module is used to provide backlight for the liquid crystal display module, and then display is realized.

[0003] In the related art, micro light emitting diodes (Micro LED) are often used to prepare backlight modules with high contrast or high brightness. The backlight module includes a substrate and a plurality of Micro LED disposed on the substrate, and the plurality of Micro LED can be used to provide a light source for the liquid crystal display module.

[0004] However, the thickness of the backlight module in the related art is relatively large, it is difficult to realize the thinning of the display device, and the competitiveness in the display field is relatively low. SUMMARY

[0005] The present application provides a backlight module and a display device, which can solve the problem that it is difficult to realize the thinning of the display device in the related art, and the competitiveness in the display field is relatively low. The technical solution is as follows:

[0006] In one aspect, a backlight module is provided, the backlight module includes:

[0007] a substrate, a first side of the substrate has a first accommodating groove;

[0008] a plurality of light emitting diodes, the plurality of light emitting diodes are used to emit light of a first color;

[0009] a color conversion structure, the color conversion structure is located in the first accommodating groove, and the color conversion structure is used to convert part of the light of the first color into light of a second color, the second color is different from the first color;

[0010] wherein, one side of the plurality of light emitting diodes emitting light and the color conversion structure are arranged at intervals in the target direction, and the target direction is perpendicular to the bearing surface of the substrate.

[0011] Optionally, the plurality of light emitting diodes are located outside the first accommodating groove and on the first side of the substrate; the backlight module further includes:

[0012] a first reflective layer, the first reflective layer is located in the first accommodating groove and between the color conversion structure and the bottom of the first accommodating groove;

[0013] a second reflective layer located on the first side of the substrate and between the substrate and the plurality of light emitting diodes, the second reflective layer having an opening for the light of the first color emitted by the light emitting diodes to pass through and be incident on the color conversion structure in the first accommodating groove.

[0014] Optionally, the first color is blue.

[0015] The color conversion structure includes a plurality of first color conversion portions and a plurality of second color conversion portions, the color conversion material of the first color conversion portions is red, the first color conversion portions are used for converting part of the blue light into red light, the color conversion material of the second color conversion portions is green, and the second color conversion portions are used for converting part of the blue light into green light; or, the color conversion structure includes a first color conversion layer and a second color conversion layer arranged in layers, the first color conversion layer is closer to the light emitting diodes than the second color conversion layer, the color conversion material of the first color conversion layer is one of red and green, and the color conversion material of the second color conversion layer is the other of red and green.

[0016] Alternatively,

[0017] The color conversion structure includes a plurality of third color conversion portions arranged at intervals, the color conversion material of the third color conversion portions is yellow, and the third color conversion portions are used for converting part of the blue light into yellow light; or, the color conversion structure includes a third color conversion layer, the color conversion material of the third color conversion layer is yellow, and the third color conversion layer is used for converting part of the blue light into yellow light.

[0018] Optionally, the backlight module further includes a first grating structure.

[0019] The first grating structure is located in the opening, and the first grating structure has a plurality of grating slits, the grating period of the first grating structure is 360 to 390, and the grating period is used to represent the number of grating slits arranged within a length range of 1 micrometer.

[0020] Optionally, the first color is blue; the color conversion structure includes a fourth color conversion portion and a fifth color conversion portion arranged at intervals, the color conversion material of the fourth color conversion portion is red, the fourth color conversion portion is used for converting part of the blue light into red light, the color conversion material of the fifth color conversion portion is green, and the fifth color conversion portion is used for converting part of the blue light into green light.

[0021] The backlight module further includes a scattering structure located in the first accommodating groove and between the fourth color conversion portion and the fifth color conversion portion, wherein the light incident on the scattering structure can be transmitted by the scattering structure to the regions where the fourth color conversion portion or the fifth color conversion portion is located.

[0022] Optionally, the opening has a first region and a second region, a normal projection of the first region on a reference plane covers a normal projection of the fourth color conversion part on the reference plane, a normal projection of the second region on the reference plane covers a normal projection of the fifth color conversion part on the reference plane, and the reference plane is parallel to a bearing surface of the substrate.

[0023] The backlight module further comprises a second grating structure and a third grating structure, the second grating structure and the third grating structure each have a plurality of grating slits, the second grating structure is located in the first region, and a grating period of the second grating structure is 430-470, the third grating structure is located in the second region, and a grating period of the third grating structure is 400-430, and the grating period represents the number of grating slits arranged in a length range of 1 micrometer.

[0024] Optionally, the first accommodating groove comprises a plurality of first grooves arranged at intervals, the color conversion structure is located in the plurality of first grooves, and a ratio of a distance between a surface of the first side of the substrate and the color conversion structure and a depth of the first groove ranges from 1 / 5 to 3 / 5.

[0025] The plurality of light-emitting diodes are located outside the first accommodating groove and on the first side of the substrate.

[0026] Optionally, the depth of the first groove ranges from 20 micrometers to 50 micrometers.

[0027] Optionally, the first color is blue.

[0028] The color conversion structure comprises a plurality of sixth color conversion parts and a plurality of seventh color conversion parts, one of the plurality of sixth color conversion parts and the plurality of seventh color conversion parts is arranged in each first groove, a color conversion material of the sixth color conversion part is red, the sixth color conversion part is used for converting part of blue light into red light, a color conversion material of the seventh color conversion part is green, and the seventh color conversion part is used for converting part of blue light into green light.

[0029] Alternatively,

[0030] The color conversion structure comprises a plurality of eighth color conversion parts, one of the plurality of eighth color conversion parts is arranged in each first groove, a color conversion material of the eighth color conversion part is yellow, and the eighth color conversion part is used for converting part of blue light into yellow light.

[0031] Optionally, the first side of the substrate further has a plurality of second accommodating grooves, each of the light emitting diodes is located in one of the second accommodating grooves; the first accommodating groove comprises a plurality of second grooves arranged at intervals, the color conversion structure is located in the plurality of second grooves; the backlight module further comprises a third reflective layer;

[0032] The third reflective layer is located on the second side of the substrate and is used for reflecting the light emitted by the light emitting diodes to the first side of the substrate.

[0033] Optionally, the backlight module further comprises an encapsulation layer.

[0034] The encapsulation layer is located on the first side of the substrate and covers the plurality of second grooves and the plurality of second accommodating grooves.

[0035] Optionally, the first color is blue.

[0036] The color conversion structure comprises a plurality of ninth color conversion parts and a plurality of tenth color conversion parts, each of the second grooves is provided with one of the plurality of ninth color conversion parts and the plurality of tenth color conversion parts, the color conversion material of the ninth color conversion part is red, the ninth color conversion part is used for converting part of the blue light into red light, the color conversion material of the tenth color conversion part is green, and the tenth color conversion part is used for converting part of the blue light into green light.

[0037] Alternatively,

[0038] The color conversion structure comprises a plurality of eleventh color conversion parts, each of the second grooves is provided with one of the plurality of eleventh color conversion parts, the color conversion material of the eleventh color conversion part is yellow, and the eleventh color conversion part is used for converting part of the blue light into yellow light.

[0039] Optionally, the backlight module further comprises a first signal trace and a second signal trace, and the light emitting diode comprises a first electrode and a second electrode.

[0040] The first signal trace is connected with the first electrode and is used for providing a first signal for the first electrode, the second signal trace is connected with the second electrode and is used for providing a second signal for the second electrode, and the light emitting diode is used for emitting light under the common driving of the first signal and the second signal.

[0041] Optionally, the backlight module further comprises a lens.

[0042] The lens is located between the plurality of light emitting diodes and the color conversion structure and is used for converging the light emitted by the light emitting diodes.

[0043] Optionally, the thickness of the substrate ranges from 0.1mm to 0.3mm.

[0044] In another aspect, a display device is provided, which includes the backlight module as described in the above aspect, and a display module located at the light-out side of the backlight module.

[0045] The backlight module is configured to provide backlight for the display module.

[0046] The technical scheme provided by the present application has at least the following beneficial effects:

[0047] The present application provides a backlight module and a display device. Since part of the light of the first color emitted by the light-emitting diode in the backlight module can be converted into light of the second color by the color conversion structure, the light emitted by the backlight module is the combined light of the other part of the light of the first color which is not converted and the light of the second color. That is, the backlight module realizes light emission by the combination of the light-emitting diode and the color conversion structure, thereby improving the color gamut of the backlight module and the color gamut of the display device, and ensuring the display effect of the display device. At the same time, since the color conversion structure is located in the first accommodating groove of the substrate, i.e., embedded in the interior of the substrate, the overall thickness of the backlight module can be reduced, the thinning of the display device is facilitated, and the competitiveness of the display device in the display field is improved. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0049] Figure 1 is a structural schematic diagram of a backlight module provided by an embodiment of the present application;

[0050] Figure 2 is a structural schematic diagram of another backlight module provided by an embodiment of the present application;

[0051] Figure 3 is a structural schematic diagram of another backlight module provided by an embodiment of the present application;

[0052] Figure 4 is a top view of a color conversion structure provided by an embodiment of the present application;

[0053] Figure 5 is a structural schematic diagram of another backlight module provided by an embodiment of the present application;

[0054] Figure 6is a structure schematic diagram of still another backlight module provided by an embodiment of the present application;

[0055] Figure 7 is a top view of a first grating structure and a lens provided by an embodiment of the present application;

[0056] Figure 8 is a structure schematic diagram of a light emitting diode provided by an embodiment of the present application;

[0057] Figure 9 is a light path schematic diagram provided by an embodiment of the present application;

[0058] Figure 10 is a structure schematic diagram of still another backlight module provided by an embodiment of the present application;

[0059] Figure 11 is a top view of a color conversion structure and a scattering structure provided by an embodiment of the present application;

[0060] Figure 12 is a top view of a second grating structure, a third grating structure and a color conversion structure provided by an embodiment of the present application;

[0061] Figure 13 is a top view of another second grating structure, a third grating structure and a color conversion structure provided by an embodiment of the present application;

[0062] Figure 14 is a structure schematic diagram of still another backlight module provided by an embodiment of the present application;

[0063] Figure 15 is another light path schematic diagram provided by an embodiment of the present application;

[0064] Figure 16 is a structure schematic diagram of still another backlight module provided by an embodiment of the present application;

[0065] Figure 17 is a structure schematic diagram of still another backlight module provided by an embodiment of the present application;

[0066] Figure 18 is a top view of a color conversion structure provided by an embodiment of the present application;

[0067] Figure 19 is a top view of a light emitting region of a light emitting diode and a color conversion structure provided by an embodiment of the present application;

[0068] Figure 20 is still another light path schematic diagram provided by an embodiment of the present application;

[0069] Figure 21 is a structure schematic diagram of still another backlight module provided by an embodiment of the present application;

[0070] Figure 22 is another structure diagram of a backlight module provided by an embodiment of the present application;

[0071] Figure 23 is a top view of a light emitting region and a color conversion structure of a light emitting diode provided by an embodiment of the present application;

[0072] Figure 24 is another structure diagram of a backlight module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0074] Figure 1 is a structure diagram of a backlight module provided by an embodiment of the present application. Referring to Figure 1 It can be seen that the backlight module 10 comprises a substrate 101, a plurality of light emitting diodes 102 and a color conversion structure 103. The first side of the substrate 101 has a first accommodating groove 101a. The plurality of light emitting diodes 102 are used to emit light rays of a first color, and the color conversion structure 103 is located in the first accommodating groove 101a, and the color conversion structure 103 is used to convert part of the light rays of the first color into light rays of a second color. The second color is different from the first color. Optionally, the first color can be blue.

[0075] The light emitting diodes 102 emit light rays of the first color, which can be directly irradiated to the color conversion structure 103, or the light emitting diodes 102 emit light rays of the first color, which can be irradiated to the color conversion structure 103 after being reflected or refracted by the peripheral structure.

[0076] The color conversion structure 103 is used to convert part of the light rays of the first color into light rays of the second color, that is, another part of the light rays of the first color will not be converted, so as to combine the unconverted light rays of the first color with the converted light rays of the second color. For example, the color of the combined light rays can be white, and the combined light rays can be emitted from the light emitting side of the backlight module 10, thereby providing backlight for a display module.

[0077] In the embodiment of the present application, the side of the plurality of light emitting diodes 102 emitting light rays and the color conversion structure 103 are arranged at intervals in a target direction X, and the target direction X is perpendicular to the bearing surface of the substrate 101. The side of the plurality of light emitting diodes 102 emitting light rays and the color conversion structure 103 arranged at intervals in the target direction X can mean that the light rays emitted by the light emitting diodes 102 are irradiated to the color conversion structure 103 after passing through a distance in the target direction X.

[0078] For example, referring toFigure 1 The side of the light emitting diode 102 from which light is emitted and the side of the color conversion structure 103 at which light is received are arranged opposite each other and have a spacing in the target direction X, so that light emitted by the light emitting diode 102 is incident on the color conversion structure 103 after passing a distance in the target direction X. Alternatively, the side of the light emitting diode 102 from which light is emitted and the side of the color conversion structure 103 at which light is received are arranged on the same side, and the side of the light emitting diode 102 from which light is emitted is provided with a reflective layer, the reflective layer and the light emitting diode 102 having a spacing in the target direction X, so that light emitted by the light emitting diode 102 is reflected by the reflective layer and is incident on the color conversion structure 103.

[0079] In summary, the backlight module provided by the embodiments of the present application can convert part of the light of the first color emitted by the light emitting diode into light of the second color by the color conversion structure, so that the light emitted by the backlight module is combined light of the light of the first color and the light of the second color. That is, the backlight module realizes light emission by the combination of the light emitting diode and the color conversion structure, so that the color gamut of the backlight module can be improved, and the color gamut of the display device can be improved, so as to ensure the display effect of the display device. At the same time, since the color conversion structure is located in the first accommodating groove of the substrate, i.e., embedded in the interior of the substrate, the overall thickness of the backlight module can be reduced, the thinning of the display device can be facilitated, and the competitiveness of the display device in the display field can be improved.

[0080] As a first optional implementation, with reference to Figure 1 The plurality of light emitting diodes 102 are located outside the first accommodating groove 101a and on the first side of the substrate 101. In this way, the plurality of light emitting diodes 102 and the color conversion structure 103 are arranged with a spacing in the target direction X. The backlight module 10 further comprises a first reflective layer 104 and a second reflective layer 105.

[0081] The first reflective layer 104 is located in the first accommodating groove 101a and between the color conversion structure 103 and the bottom of the first accommodating groove 101a. The second reflective layer 105 is located on the first side of the substrate 101 and between the substrate 101 and the plurality of light emitting diodes 102. The second reflective layer 105 has an opening 105a for light emitted by the light emitting diode 102 to pass through and be incident on the color conversion structure 103 in the first accommodating groove 101a.

[0082] Optionally, the substrate 101 can be a glass substrate. In the process of manufacturing the backlight module 10, the various structures can be formed on a 0.5mm or 0.7mm thick glass substrate first, and then the glass substrate is thinned after the other structures are manufactured, so that the thickness of the final substrate 101 is in the range of 0.1mm to 0.3mm. In this way, on the one hand, the glass substrate can provide good support performance for the other structures when the other structures are formed on the thicker glass substrate, and on the other hand, the final thinned glass substrate 101 can ensure the thinning of the backlight module. Alternatively, in the process of manufacturing the backlight module 10, a thin glass with a thickness of 0.1mm to 0.3mm can be directly used to ensure the thinning effect of the backlight module 10.

[0083] The first accommodating groove 101a can be formed on the glass substrate by laser drilling or acid etching. The shape and size of the first accommodating groove 101a can be related to the design target of the product. Generally, the shape of the first accommodating groove 101a can be circular, the depth can be in the range of 10μm to 100μm, and the diameter can be in the range of 20μm to 300μm.

[0084] Option 1 (color conversion structure 103), referring to Figure 1 and Figure 2 The color conversion structure 103 includes a plurality of first color conversion portions 1031a and a plurality of second color conversion portions 1032a arranged at intervals. The color conversion material of the first color conversion portion 1031a is red, and the first color conversion portion 1031a is used to convert part of the blue light into red light. The color conversion material of the second color conversion portion 1032a is green, and the second color conversion portion 1032a is used to convert part of the blue light into green light.

[0085] Among them, the blue light includes light converted by the first color conversion portion 1031a and the second color conversion portion 1032a, and also includes light not converted by the first color conversion portion 1031a or the second color conversion portion 1032a. That is, the first reflecting layer 104 and the second reflecting layer 105 have blue light, red light and green light between them. The three colors of light combine with each other and are reflected multiple times between the first reflecting layer 104 and the second reflecting layer 105, and then exit from the second side of the substrate 101. Among them, the combination of blue light, red light and green light can constitute white light.

[0086] Option 2 (color conversion structure 103), referring to Figure 3 The color conversion structure 103 includes a plurality of third color conversion portions 1031b arranged at intervals. The color conversion material of the third color conversion portion 1031b is yellow, and the third color conversion portion 1031b is used to convert part of the blue light into yellow light.

[0087] The blue light includes light converted by the third color conversion portion 1031b and light not converted by the third color conversion portion 1031b. That is, the first reflective layer 104 and the second reflective layer 105 have blue light and yellow light therebetween. The two colors of light combine with each other and exit from the second side of the substrate 101 after multiple reflections between the first reflective layer 104 and the second reflective layer 105. The combination of the blue light and the yellow light can constitute white light.

[0088] In the above-mentioned scheme one and scheme two, each color conversion portion is a patterned structure, which can be circular or rectangular or other shapes, and the shape of each color conversion portion is not limited in the embodiments of the present application. Optionally, referring to Figure 4 In the scheme one, the first color conversion portion 1031a and the second color conversion portion 1032a are spaced and uniformly arranged in the first accommodating groove 101a.

[0089] In addition, the thickness of each color conversion portion ranges from 3 μm to 20 μm, and the width ranges from 3 μm to 10 μm. In addition, 5% to 15% scattering particles (such as titanium oxide) can be mixed in the color conversion material of each color conversion portion to scatter light.

[0090] The scheme three (color conversion structure 103) refers to Figure 5 The color conversion structure 103 includes a first color conversion layer 1031c and a second color conversion layer 1032c stacked. The first color conversion layer 1031c is closer to the light-emitting diode 102 than the second color conversion layer 1032c. The color conversion material of the first color conversion layer 1031c is one of red and green, and the color conversion material of the second color conversion layer 1032c is the other of red and green.

[0091] Optionally, assuming that the color conversion material of the first color conversion layer 1031c is red and the color conversion material of the second color conversion layer 1032c is green. In this case, a first part of the blue light can be converted by the first color conversion layer 1031c into red light, a second part of the blue light not converted by the first color conversion layer 1031c can be converted by the second color conversion layer 1032c into green light, and a third part of the blue light not converted by the first color conversion layer 1031c and the second color conversion layer 1032c is still blue light. Thus, the converted red light and green light and the third part of the blue light not converted combine with each other and exit from the second side of the substrate 101 after multiple reflections between the first reflective layer 104 and the second reflective layer 105. The combination of the blue light, the red light, and the green light can constitute white light.

[0092] Assuming that the color conversion material of the first color conversion layer 1031c is green, and the color conversion material of the second color conversion layer 1032c is red. In this case, the first part of the blue light can be converted into green light by the first color conversion layer 1031c, the second part of the blue light which is not converted by the first color conversion layer 1031c, and the third part of the green light which is converted can be converted into red light by the second color conversion layer 1032c. And the fourth part of the blue light which is not converted by the first color conversion layer 1031c and the second color conversion layer 1032c is still blue light, and the fifth part of the green light which is not converted by the second color conversion layer 1032c is still green light. Thus, the converted red light and the fifth part of the green light which is not converted, and the fourth part of the blue light which is not converted combine with each other and are emitted from the second side of the substrate 101 after multiple reflections between the first reflective layer 104 and the second reflective layer 105. Wherein, the combination of the blue light, the red light and the green light can constitute white light.

[0093] Scheme four (color conversion structure 103), referring to Figure 6 The color conversion structure 103 includes a third color conversion layer 1031d, and the color conversion material of the third color conversion layer 1031d is yellow. The third color conversion layer 1031d is used to convert part of the blue light into yellow light.

[0094] Wherein, the blue light includes the light which is not converted by the third color conversion layer 1031d in addition to the light which is converted by the third color conversion layer 1031d. That is, the first reflective layer 104 and the second reflective layer 105 have blue light and yellow light therebetween. The two colors of light combine with each other and are emitted from the second side of the substrate 101 after multiple reflections between the first reflective layer 104 and the second reflective layer 105. Wherein, the combination of the blue light and the yellow light can constitute white light.

[0095] In the above-mentioned scheme three and scheme four, each color conversion layer is a large film layer structure. Alternatively, the sum of the thicknesses of the first color conversion layer 1031c and the second color conversion layer 1032c, and the thickness of the third color conversion layer 1031d are all in the range of 5 μm to 100 μm. And the color conversion material of each color conversion layer can be mixed with 5% to 15% scattering particles (such as titanium oxide, etc.) for scattering light.

[0096] In the embodiments of the present application, referring to Figures 1 to 6 The backlight assembly 10 further includes a filling layer 106. The filling layer 106 can be filled in the first accommodating groove 101a to fill the first accommodating groove 101a. Alternatively, the material of the filling layer 106 can be a resin material, such as acrylic resin and epoxy resin, etc.

[0097] In the embodiments of the present application, the material of the first reflective layer 104 can be a metal reflective material, or can also be a resin material with high concentration of scattering particles. The thickness of the first reflective layer 104 ranges from 100 nm to 5 μm. Since the thickness of the resin material is usually about 10 μm, and the thickness of the metal reflective material can be about 100 nm, in order to avoid the thickness of the first reflective layer 104 being too thick, the material of the first reflective layer 104 can be preferentially selected as a metal reflective material, for example, the material of the first reflective layer 104 can be a high reflective material such as silver (Ag).

[0098] The opening 105a of the second reflective layer 105 needs to transmit the light of the first color and irradiate onto the color conversion structure 103, and therefore the design of the opening 105a can correspond to the color conversion structure 103. For example, in the above-mentioned scheme one and scheme two of the color conversion structure 103, the second reflective layer 105 can be designed with a plurality of openings 105a, and the orthographic projection of each opening 105a on a reference plane covers the orthographic projection of one color conversion portion on the reference plane, and the reference plane is parallel to the bearing surface of the substrate 101. In the above-mentioned scheme three and scheme four of the color conversion structure 103, the second reflective layer 105 is also designed with a plurality of openings 105a, and the orthographic projection of each opening 105a on a reference plane exposes a part of the area of the color conversion layer.

[0099] Optionally, the material of the second reflective layer 105 is a metal reflective material, or can also be a resin material with high concentration of scattering particles. The thickness of the second reflective layer 105 ranges from 100 nm to 5 μm. Since the thickness of the resin material is usually about 10 μm, and the thickness of the metal reflective material can be about 100 nm, in order to avoid the thickness of the second reflective layer 105 being too thick, the material of the second reflective layer 105 can be preferentially selected as a metal reflective material, for example, the material of the second reflective layer 105 can be a high reflective material such as silver (Ag).

[0100] In the embodiments of the present application, the reference plane is parallel to the bearing surface of the substrate 101. Figures 2 to 3 In addition, as shown in FIGS. 5 and 6, the backlight module 10 further comprises a first grating structure 107. The first grating structure 107 can be used to transmit the light emitted by the light emitting diode 102 to the space between the first reflective layer 104 and the second reflective layer 105, and can block the light between the first reflective layer 104 and the second reflective layer 105 from transmitting to the area where the light emitting diode 102 is located. In this way, it can be ensured that the light of the backlight module 10 can exit from the second side of the substrate 101. As shown in FIGS. 5 and 6, the orthographic projection of the first grating structure 107 on a reference plane is located in the orthographic projection of the first accommodating groove 101a on the reference plane. Figure 7 As shown in FIGS. 5 and 6, the orthographic projection of the first grating structure 107 on a reference plane is located in the orthographic projection of the first accommodating groove 101a on the reference plane.

[0101] The refraction law of the light rays satisfies: n1*sinθ1=n2*sin90°. n1 can be the refractive index of the medium between the light-emitting diode 102 and the first grating structure 107, for example, the refractive index n1 of the filled resin material, which can range from 1.3 to 1.5. θ1 can be the angle of the light rays irradiated onto the first grating structure 107. n2 can be the refractive index of the first grating structure 107, for example, the refractive index n2 can range from 1.8 to 2.5. 90° can be used to represent the angle of the light rays after refraction as 90°.

[0102] Optionally, the first grating structure 107 has a plurality of grating slits, and the grating period of the first grating structure 107 is 360 to 390, the grating period being used to represent the number of grating slits arranged within a length range of 1 micrometer. The height of the first grating structure 107 ranges from 70 nm to 100 nm, and the duty cycle is 0.5. The duty cycle of the first grating structure 107 refers to the ratio of the slit area and the non-slit area. The first grating structure 107 is used to transmit blue light and can block other colors of light from being transmitted. The first grating structure 107 can be referred to as a blue grating, and the first grating structure 107 can be a transmission grating.

[0103] In the embodiments of the present application, since the first color of the light emitted by the light-emitting diode 102 is blue, the wavelength range of the light emitted by the light-emitting diode 102 is 450 nm to 480 nm. In addition, the width of the light-emitting diode 102 can range from 20 micrometers to 300 micrometers, the thickness can range from 5 micrometers to 10 micrometers, and the brightness can range from 1000 nit to 200,000 nit.

[0104] Optionally, the light-emitting diode 102 has a light-emitting region 102a and a non-light-emitting region 102b. Referring to Figure 8 , the orthographic projection of the light-emitting region 102a on the reference plane covers the orthographic projection of the color conversion structure 103 on the reference plane and covers the orthographic projection of the first grating structure 107 on the reference plane. The non-light-emitting region 102b can be used to connect the signal line.

[0105] Referring to Figure 8The light-emitting diode 102 comprises a substrate 1021, a first doped layer 1022, a light-emitting layer 1023, a second doped layer 1024, an insulating layer 1025, a first electrode 1026 and a second electrode 1027 which are sequentially arranged on the substrate 1021. The first doped layer 1022 has a first target area a1 and a second target area a2. The light-emitting layer 1023 and the second doped layer 1024 are stacked on the first target area a1 and the first doped layer 1022. The insulating layer 1025 is arranged on a side of the second doped layer 1024 away from the substrate 1021. The insulating layer 1025 has a first via hole and a second via hole. The first via hole is used to expose a partial area of the second doped layer 1024, and the second via hole is used to expose a partial area of the second target area a2. The first electrode 1026 of the light-emitting diode 102 is electrically connected to the second doped layer 1024 through the first via hole, and the second electrode 1027 of the light-emitting diode 102 is electrically connected to the second target area a2 through the second via hole.

[0106] The light-emitting area 102a of the light-emitting diode 102 can be an area between the first electrode 1026 and the second electrode 1027, and the non-light-emitting area 102b can include an area where the first electrode 1026 is located and an area where the second electrode 1027 is located.

[0107] Referring to Figures 1 to 3 and Figures 5 to 6 The backlight module 10 further comprises a first signal wire 108 and a second signal wire 109. The first signal wire 108 is connected to the first electrode 1026 and used to provide a first signal for the first electrode 1026, and the second signal wire 109 is connected to the second electrode 1027 and used to provide a second signal for the second electrode 1027. The light-emitting diode 102 is used to emit light under the common driving of the first signal and the second signal. One of the first signal and the second signal can be a positive signal, and the other can be a negative signal.

[0108] Optionally, the materials of the first signal wire 108 and the second signal wire 109 can be conductive materials, such as copper (Cu). The thickness of the first signal wire 108 and the second signal wire 109 ranges from 2 μm to 5 μm, and the width ranges from 3 μm to 50 μm.

[0109] Referring to Figures 2 to 3 and Figures 5 to 6 The backlight module 10 further comprises a protective layer 110 arranged on a side of the second reflective layer 105 away from the substrate 101. The protective layer 110 mainly plays a role of flattening and protection. The material of the protective layer 110 can be an epoxy resin material, and the transmittance of the material is greater than 99%, and the thickness ranges from 1 μm to 3 μm.

[0110] Further, the backlight assembly 10 further comprises a lens 111. The lens 111 is located between the plurality of light emitting diodes 102 and the color conversion structure 103, and specifically located on the side of the protective layer 110 away from the substrate 101. The lens 111 can be used to converge the light emitted by the light emitting diodes 102, and the refractive index of the material thereof ranges from 1.4 to 2.0. The lens 111 covers the normal projection of the opening 105a in the second reflective layer 105 on the reference plane in the normal projection on the reference plane.

[0111] Optionally, the lens 111 can be a circular lens with a diameter ranging from 20 μm to 50 μm, or can be a strip-shaped lens with a width ranging from 30 μm to 50 μm. The specific shape of the lens is not limited in the embodiments of the present application, and the drawings of the embodiments of the present application take the circular lens as an example.

[0112] The backlight assembly 10 further comprises a white oil layer 112 located on the side of the plurality of light emitting diodes 102 away from the substrate 101, for covering the plurality of light emitting diodes 102 to avoid light leakage.

[0113] In the above first optional implementation, referring to Figure 9 , the light emitted by the light emitting diodes 102 is converged by the lens 111 and transmitted through the first grating structure 107. Part of the transmitted light of the first color is subjected to color conversion by the color conversion structure 103. The converted light is combined and reflected multiple times between the first reflective layer 104 and the second reflective layer 105, and then emitted from the second side of the substrate 101. Figure 9 In order to facilitate the display of the light path arrows, the markings of the various structures are not performed in Figure 9 .

[0114] As a second optional implementation, referring to Figure 10 , the color conversion structure 103 comprises a fourth color conversion portion 1031e and a fifth color conversion portion 1032e arranged at intervals. The color conversion material of the fourth color conversion portion 1031e is red, and the fourth color conversion portion 1031e is used to convert part of the blue light into red light. The color conversion material of the fifth color conversion portion 1032e is green, and the fifth color conversion portion 1032e is used to convert part of the blue light into green light.

[0115] And, referring to Figure 10 , the backlight module 10 further comprises a scattering structure 113 located in the first accommodating groove 101a and between the fourth color conversion portion 1031e and the fifth color conversion portion 1032e. The light irradiated to the scattering structure 113 can be transmitted to the area where the fourth color conversion portion 1031e or the fifth color conversion portion 1032e is located by the scattering structure 113.

[0116] In the embodiment of the present application, the blue light rays include the light rays converted by the fourth color conversion part 1031e and the fifth color conversion part 1032e, and also include the light rays which are not converted by the fourth color conversion part 1031e or the fifth color conversion part 1032e. That is, the first reflective layer 104 and the second reflective layer 105 have the blue light rays, the red light rays and the green light rays therebetween. The three kinds of light rays combine with each other and exit from the second side of the substrate 101 after multiple reflections between the first reflective layer 104 and the second reflective layer 105. The combination of the blue light rays, the red light rays and the green light rays can constitute white light rays.

[0117] Reference Figure 11 The normal projection of the light emitting region 102a of the light emitting diode 102 on the reference plane covers the normal projection of the fourth color conversion part 1031e, the scattering structure 113 and the fifth color conversion part 1032e on the reference plane. For example, the shape of the light emitting region 102a of the light emitting diode 102 is circular, the shapes of the fourth color conversion part 1031e and the fifth color conversion part 1032e can be similar to semicircular, and the shape of the scattering structure 113 can be strip-shaped.

[0118] Optionally, the scattering structure 113 can be resin scattering particles (the content of the scattering particles is higher than 30%), the height of the scattering structure 113 ranges from 5 μm to 50 μm, and the width ranges from 3 μm to 10 μm. The thickness of the fourth color conversion part 1031e and the fifth color conversion part 1032e ranges from 2 μm to 50 μm, and the diameter ranges from 10 μm to 150 μm.

[0119] In the embodiment of the present application, the opening 105a of the second reflective layer 105 has a first area and a second area. The normal projection of the first area on the reference plane covers the normal projection of the fourth color conversion part 1031e on the reference plane, and the normal projection of the second area on the reference plane covers the normal projection of the fifth color conversion part 1032e on the reference plane. Thus, one part of the light rays emitted by the light emitting diode 102 can irradiate to the fourth color conversion part 1031e through the first area, and another part of the light rays can irradiate to the fifth color conversion part 1032e through the second area.

[0120] Further, reference Figure 10 The backlight module 10 further includes a second grating structure 114 and a third grating structure 115. The second grating structure 114 and the third grating structure 115 each have a plurality of grating slits. In combination Figure 11 and Figure 12The second grating structure 114 is located in the first region, i.e., the orthographic projection of the second grating structure 114 on the reference plane covers the orthographic projection of the fourth color conversion part 1031e on the reference plane. The third grating structure 115 is located in the second region, i.e., the orthographic projection of the third grating structure 115 on the reference plane covers the orthographic projection of the fifth color conversion part 1032e on the reference plane.

[0121] The grating period of the second grating structure 114 is 430 to 470, and the second grating structure 114 is used to block red light from transmitting to the area where the light-emitting diode 102 is located. The grating period of the third grating structure 115 is 400 to 430, and the third grating structure 115 is used to block green light from transmitting to the area where the light-emitting diode 102 is located. The second grating structure 114 and the third grating structure 115 can both be reflective gratings.

[0122] From Figure 10 and Figure 12 It can be seen that the second grating structure 114 and the third grating structure 115 are arranged adjacent to each other, and the boundary between the second grating structure 114 and the third grating structure 115 is located above the scattering structure 113. Alternatively, referring to Figure 13 , the second grating structure 114 and the third grating structure 115 have a spacing therebetween, and it is only required to ensure that the second grating structure 114 completely covers the fourth color conversion part 1031e and the third grating structure 115 completely covers the fifth color conversion part 1032e.

[0123] In the second optional implementation, for the substrate 101, the first accommodating groove 101a, the filling layer 106, the first reflective layer 104, the second reflective layer 105 except the opening 105a, the light-emitting diode 102, the first signal wire 108, the second signal wire 109, the protective layer 110, the lens 111, and the white oil layer 112 can be designed according to the first optional implementation, and details are not repeated here.

[0124] Of course, referring to Figure 14 , in the second optional implementation, the backlight module 10 can also not be designed with the protective layer 110 and the lens 111, and details are not limited herein.

[0125] In the above-mentioned second optional implementation, referring to Figure 15The light emitted by the light-emitting diode 102 passes through the second grating structure 114 and illuminates the fourth color transfer section 1031e, or passes through the third grating structure 115 and illuminates the fifth color transfer section 1032e. The light illuminating the scattering structure 113 is then transmitted by the scattering structure 113 to either the fourth color transfer section 1031e or the fifth color transfer section 1032e. After the light is converted by the fourth color transfer section 1031e and the fifth color transfer section 1032e, the converted light and the unconverted light are combined and reflected multiple times between the first reflective layer 104 and the second reflective layer 105 before exiting from the second side of the substrate 101.

[0126] As a third optional implementation, refer to Figure 16 Multiple light-emitting diodes (LEDs) 102 are located outside the first receiving groove 101a and on the first side of the substrate 101. The first receiving groove 101a includes multiple spaced-apart first recesses C1, and the color-transfer structure 103 is located within the first recesses C1. The first recesses C1 can be relatively deep, allowing for a larger distance between the surface of the color-transfer structure 103 near the first side of the substrate 101 and the LEDs 102 when the color-transfer structure 103 is positioned within the first recesses C1. This prevents the heat generated when the LEDs 102 emit light from affecting the performance of the color-transfer structure 103.

[0127] Optionally, the ratio of the distance between the surface of the color transfer structure 103 near the first side of the substrate 101 and the surface of the first side of the substrate 101 to the depth of the first groove C1 ranges from 1 / 5 to 3 / 5. Optionally, the depth of the first groove C1 ranges from 20 μm to 50 μm.

[0128] Option 1 (Color to Structure 103), see reference Figure 16 The color conversion structure 103 includes multiple sixth color conversion units 1031f and multiple seventh color conversion units 1032f. Each first groove C1 contains one of the multiple sixth color conversion units 1031f and multiple seventh color conversion units 1032f. The sixth color conversion unit 1031f uses red material and is used to convert a portion of the blue light into red light. The seventh color conversion unit 1032f uses green material and is used to convert a portion of the blue light into green light.

[0129] The blue light includes light converted by the sixth color conversion portion 1031f and the seventh color conversion portion 1032f, and also includes light not converted by the sixth color conversion portion 1031f or the seventh color conversion portion 1032f. That is, the blue light, the red light, and the green light exist between the first reflective layer 104 and the second reflective layer 105. The three colors of light combine with each other and exit from the second side of the substrate 101. The combination of the blue light, the red light, and the green light can form white light.

[0130] Option two (color conversion structure 103), referring to Figure 17 The color conversion structure 103 includes a plurality of eighth color conversion portions 1031g. One of the plurality of eighth color conversion portions 1031g is arranged in each first groove C1. The eighth color conversion portion 1031g is yellow, and the eighth color conversion portion 1031g is configured to convert part of the blue light into yellow light.

[0131] The blue light includes light converted by the eighth color conversion portion 1031g, and also includes light not converted by the eighth color conversion portion 1031g. That is, the blue light and the yellow light exist between the first reflective layer 104 and the second reflective layer 105. The two colors of light combine with each other and exit from the second side of the substrate 101. The combination of the blue light and the yellow light can form white light.

[0132] In the above-mentioned option one and option two, the shape of each color conversion portion can be the same as the shape of the first groove C1, for example, referring to Figure 18 The sixth color conversion portion 1031f and the seventh color conversion portion 1032f can be circular or rectangular or other shapes, and the embodiments of the present application do not limit the shape of each color conversion portion and the first groove C1. Optionally, the thickness of each color conversion portion ranges from 2 μm to 20 μm. In addition, 5% to 15% scattering particles (such as titanium oxide) can be mixed in the color conversion material of each color conversion portion to scatter light.

[0133] In the embodiments of the present application, the backlight assembly 10 further includes a lens 111 between the plurality of light emitting diodes 102 and the color conversion structure 103, specifically on the side of the color conversion portion close to the first side of the substrate 101 in the first groove C1. The lens 111 can be used to converge the light emitted by the light emitting diode 102. The lens 111 can be prepared by printing and photolithography. Further, after designing the color conversion portion and the lens 111 in the first groove C1, a resin material can be filled in the first groove C1 to achieve a flat effect.

[0134] Referring to Figure 18The sixth color conversion part 1031f and the seventh color conversion part 1032f are uniformly distributed, and the first grooves C1 on the substrate 101 can be uniformly distributed. It is referred to Figure 19 The light emitting area 102a of each light emitting diode 102 can cover the color conversion part in the first groove C1 in the reference plane. The first signal wire 108 and the second signal wire 109 connected to the light emitting diode 102 can also partially overlap the color conversion part. In addition, Figure 19 The first signal wire 108 and the second signal wire 109 in the reference plane and the position where the light emitting diode 102 is connected can have a connection pad, and the connection pad and the signal wire can be an integrated structure.

[0135] In the third optional implementation, the related design of the substrate 101, the light emitting diode 102, the first signal wire 108, the second signal wire 109, and the white oil layer 112 can refer to the first optional implementation, and the embodiments of the present application will not be repeated here.

[0136] In the third optional implementation, it is referred to Figure 20 The light emitted by the light emitting diode 102 is converged by the lens 111 and irradiated on the color conversion part. After the conversion of the light passing through the color conversion part, the converted light and the unconverted light are combined and emitted from the second side of the substrate 101. Figure 20 In the reference plane, in order to facilitate the display of the light path arrow, the structures are not labeled in the Figure 20 In the reference plane, in order to facilitate the display of the light path arrow, the structures are not labeled in the Figure 20 In the reference plane, in order to facilitate the display of the light path arrow, the structures are not labeled in the

[0137] As a fourth optional implementation, it is referred to Figure 21 The first side of the substrate 101 also has a plurality of second accommodating grooves 101b, and each light emitting diode 102 is located in a second accommodating groove 101b. That is, the light emitting diode 102 is embedded in the substrate 101. The first accommodating groove 101a includes a plurality of second grooves C2 arranged at intervals, and the color conversion structure 103 is located in the second groove C2. In addition, the backlight module 10 further comprises a third reflection layer 116 located on the second side of the substrate 101, and the third reflection layer 116 is used to reflect the light emitted by the light emitting diode 102 to the first side of the substrate 101.

[0138] The material of the third reflective layer 116 can be a metal reflective material or a resin material with high concentration of scattering particles. The thickness of the third reflective layer 116 ranges from 100 nm to 5 μm. Since the thickness of the resin material is usually about 10 μm, while the thickness of the metal reflective material can be about 100 nm, in order to avoid the thickness of the third reflective layer 116 being too thick, the material of the third reflective layer 116 can be preferentially selected as a metal reflective material, such as silver (Ag) or other high reflective material.

[0139] The second accommodating groove 101b can be formed on the substrate 101 by laser drilling or acid etching. The shape and size of the first accommodating groove 101a can be matched with the light emitting diode 102. In addition, the second accommodating groove 101b also needs to be designed to provide the first signal trace 108 and the second signal trace 109 for the light emitting diode 102.

[0140] Further, the second accommodating groove 101b can also be designed with a filling material to fill the second accommodating groove 101b. Optionally, the filling material can be a resin material, such as acrylic resin and epoxy resin, etc.

[0141] Option 1 (color conversion structure 103), refer to Figure 21 The color conversion structure 103 includes a plurality of ninth color conversion portions 1031g and a plurality of tenth color conversion portions 1032g. Each second groove C2 is provided with one of the plurality of ninth color conversion portions 1031g and the plurality of tenth color conversion portions 1032g. The color conversion material of the ninth color conversion portion 1031g is red, and the ninth color conversion portion 1031g is used to convert part of the blue light into red light. The color conversion material of the tenth color conversion portion 1032g is green, and the tenth color conversion portion 1032g is used to convert part of the blue light into green light.

[0142] Among them, the blue light includes light converted by the ninth color conversion portion 1031g and the tenth color conversion portion 1032g, and light not converted by the ninth color conversion portion 1031g and the tenth color conversion portion 1032g. That is, the third reflective layer 116 close to the second side of the substrate 101 has blue light, red light and green light. The three colors of light combine with each other and exit from the second side of the substrate 101. Among them, the combination of blue light, red light and green light can constitute white light.

[0143] Option 2 (color conversion structure 103), refer to Figure 22The color conversion structure 103 includes a plurality of eleventh color conversion portions 1031h. One of the plurality of eleventh color conversion portions 1031h is arranged in each second groove C2. The color conversion material of the eleventh color conversion portion 1031h is yellow, and the eleventh color conversion portion 1031h is configured to convert part of the blue light into yellow light.

[0144] The blue light includes light that is not converted by the eleventh color conversion portion 1031h. That is, the third reflective layer 116 has blue light and yellow light close to the second side of the substrate 101. The two colors of light combine with each other and exit from the second side of the substrate 101. The combination of the blue light and the yellow light can constitute white light.

[0145] In the above-mentioned first and second solutions, each color conversion portion is a patterned structure, which can have the same shape as the second groove C2, for example, referring to Figure 23 The ninth color conversion portion 1031g and the tenth color conversion portion 1032g are both strips and are arranged alternately. The shape of each color conversion portion is not limited in the embodiments of the present application. Optionally, the thickness of each color conversion portion ranges from 2 μm to 5 μm. In addition, 5% to 15% scattering particles (for example, titanium oxide) can be mixed into the color conversion material of each color conversion portion to scatter light.

[0146] Referring to Figure 21 and Figure 22 It can also be seen that the backlight assembly 10 further includes an encapsulation layer 117 on the first side of the substrate 101. The encapsulation layer 117 covers the plurality of second grooves C2 and the plurality of second accommodating grooves 101b. That is, the encapsulation layer 117 can protect the color conversion portions in the second grooves C2 and the light emitting diodes 102 in the second accommodating grooves 101b.

[0147] Optionally, the encapsulation layer 117 can have a three-layer structure, in which the material of the first layer is silicon nitride (SiNx) with a thickness of 1000 nm, the material of the second layer is epoxy resin with a thickness of 10 μm, and the material of the third layer is aluminum oxide (Al3O2) with a thickness of 100 nm. That is, the encapsulation layer 117 can have a three-layer structure of SiNx, epoxy resin, and Al3O2, and the first layer (SiNx) of the encapsulation layer is closer to the substrate 101 than the third layer (Al3O2).

[0148] In the fourth optional implementation, the related designs of the substrate 101, the light emitting diode 102, the first signal wire 108, and the second signal wire 109 can all refer to the first optional implementation described above, and thus the details are not repeated here.

[0149] In the above-mentioned fourth optional implementation, referring toFigure 24 The light emitted by the light emitting diode 102 is incident on the third reflective layer 116 and is reflected by the third reflective layer 116 to the color conversion portion. The light incident on the color conversion portion is converted by the color conversion portion, and the converted light and the unconverted light are combined and emitted from the second side of the substrate 101. Figure 24 In the drawings, the light path arrows are shown for convenience, and thus the filling patterns of the respective structures and the substrate 101 are not labeled, and Figure 12 In the drawings, the light path arrows are shown for convenience, and thus the filling patterns of the respective structures and the substrate 101 are not labeled, and Figure 24 In the drawings, the light path arrows are shown for convenience, and thus the filling patterns of the respective structures and the substrate 101 are not labeled, and

[0150] In summary, the backlight module provided by the embodiments of the present application can convert part of the light of the first color emitted by the light emitting diode into light of the second color by the color conversion structure, so that the light emitted by the backlight module is the combined light of the other part of the light of the first color and the light of the second color. That is, the backlight module realizes light emission by the combination of the light emitting diode and the color conversion structure, so as to improve the color gamut of the backlight module, and further improve the color gamut of the display device, and ensure the display effect of the display device. At the same time, since the color conversion structure is located in the first accommodating groove of the substrate, i.e., embedded in the interior of the substrate, the overall thickness of the backlight module can be reduced, the thinning of the display device is facilitated, and the competitiveness of the display device in the display field is improved.

[0151] The embodiments of the present application also provide a display device, which comprises the backlight module 10 provided by the above embodiments, and a display module located on the light emitting side of the backlight module 10. The backlight module 10 is used to provide backlight for the display module.

[0152] Optionally, the display device can be a liquid crystal display (LCD) display device. The display device can be any appropriate display device, including but not limited to a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an electronic book, and any product or component having a display function.

[0153] Since the display device can have substantially the same technical effects as the backlight module structure described in the above embodiments, for the purpose of brevity, the technical effects of the backlight module are not described again here.

[0154] The terms used in the embodiments of the present application are only used to explain the embodiments of the present application, and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by a person having ordinary skill in the art to which the present application belongs.

[0155] The terms used in the description of the embodiments of the present application are only used to explain the embodiments of the present application and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings to those having ordinary skills in the art to which the present application pertains. The terms "first", "second", "third" and the like used in the description of the present patent application and the claims are not intended to denote any sequence, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "one" or "a" and the like do not denote a quantity limitation, but denote the presence of at least one. The terms "include" or "contain" and the like mean that the elements or objects appearing before the "include" or "contain" cover the elements or objects listed after the "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0156] The above is only an optional embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A backlight module, characterized in that, The backlight module (10) includes: A substrate (101) has a first receiving groove (101a) on its first side. A plurality of light-emitting diodes (102) are provided for emitting light of a first color; the plurality of light-emitting diodes (102) are located outside the first receiving groove (101a) and on a first side of the substrate (101); A color conversion structure (103) is located in the first receiving groove (101a) and is used to convert a portion of the light in the first color into light of a second color, the second color being different from the first color. The light-emitting side of the plurality of light-emitting diodes (102) and the color-changing structure (103) are spaced apart in the target direction (X), and the target direction (X) is perpendicular to the bearing surface of the substrate (101); The backlight module also includes: A first reflective layer (104) is located within the first receiving groove (101a) and between the color conversion structure (103) and the bottom of the first receiving groove (101a); The second reflective layer (105) is located on the first side of the substrate (101) and between the substrate (101) and the plurality of light-emitting diodes (102). The second reflective layer (105) has an opening (105a) for allowing light of the first color emitted by the light-emitting diodes (102) to pass through and illuminate the color-changing structure (103) in the first receiving groove (101a).

2. The backlight module according to claim 1, characterized in that, The first color is blue; The color conversion structure (103) includes a plurality of spaced first color conversion parts (1031a) and a plurality of second color conversion parts (1032a). The color conversion material of the first color conversion part (1031a) is red, and the first color conversion part (1031a) is used to convert a portion of the blue light into red light. The color conversion material of the second color conversion part (1032a) is green, and the second color conversion part (1032a) is used to convert a portion of the blue light into green light. Alternatively, the color conversion structure (103) includes a first color conversion layer (1031c) and a second color conversion layer (1032c) stacked together. The first color conversion layer (1031c) is closer to the light-emitting diode (102) than the second color conversion layer (1032c). The color conversion material of the first color conversion layer (1031c) is one of red and green, and the color conversion material of the second color conversion layer (1032c) is the other color of red and green. or, The color conversion structure (103) includes a plurality of third color conversion sections (1031b) spaced apart. The color conversion material of the third color conversion section (1031b) is yellow, and the third color conversion section (1031b) is used to convert a portion of the blue light into yellow light. Alternatively, the color conversion structure (103) includes a third color conversion layer (1031d). The color conversion material of the third color conversion layer (1031d) is yellow, and the third color conversion layer (1031d) is used to convert a portion of the blue light into yellow light.

3. The backlight module according to claim 1, characterized in that, The backlight module (10) further includes: a first grating structure (107); The first grating structure (107) is located in the opening (105a) and has a plurality of grating slits. The grating period of the first grating structure (107) is 360 to 390, and the grating period is used to represent the number of grating slits set within a length range of 1 micrometer.

4. The backlight module according to claim 1, characterized in that, The first color is blue; the color conversion structure (103) includes a fourth color conversion part (1031e) and a fifth color conversion part (1032e) arranged at intervals. The color conversion material of the fourth color conversion part (1031e) is red, and the fourth color conversion part (1031e) is used to convert part of the blue light into red light. The color conversion material of the fifth color conversion part (1032e) is green, and the fifth color conversion part (1032e) is used to convert part of the blue light into green light. The backlight module (10) further includes a scattering structure (113) located within the first receiving groove (101a) and between the fourth color transfer section (1031e) and the fifth color transfer section (1032e), wherein light irradiated to the scattering structure (113) can be transmitted by the scattering structure (113) to the area where the fourth color transfer section (1031e) or the fifth color transfer section (1032e) is located.

5. The backlight module according to claim 4, characterized in that, The opening (105a) has a first region and a second region. The orthographic projection of the first region onto the reference plane covers the orthographic projection of the fourth color transfer part (1031e) onto the reference plane. The orthographic projection of the second region onto the reference plane covers the orthographic projection of the fifth color transfer part (1032e) onto the reference plane. The reference plane is parallel to the bearing surface of the substrate (101). The backlight module (10) further includes a second grating structure (114) and a third grating structure (115), both of which have multiple grating slits. The second grating structure (114) is located in the first region and has a grating period of 430 to 470. The third grating structure (115) is located in the second region and has a grating period of 400 to 430. The grating period is used to represent the number of grating slits set within a length range of 1 micrometer.

6. The backlight module according to any one of claims 1 to 5, characterized in that, The backlight module further includes: a first signal trace (108) and a second signal trace (109), and the light-emitting diode (102) includes a first electrode (1026) and a second electrode (1027). The first signal trace (108) is connected to the first electrode (1026) to provide a first signal to the first electrode (1026), the second signal trace (109) is connected to the second electrode (1027) to provide a second signal to the second electrode (1027), and the light-emitting diode (102) is used to emit light under the combined drive of the first signal and the second signal.

7. A backlight module, characterized in that, The backlight module (10) includes: A substrate (101) has a first receiving groove (101a) on its first side. A plurality of light-emitting diodes (102) are provided for emitting light of a first color; A color conversion structure (103) is located in the first receiving groove (101a) and is used to convert a portion of the light in the first color into light of a second color, the second color being different from the first color. The light-emitting side of the plurality of light-emitting diodes (102) and the color-changing structure (103) are spaced apart in the target direction (X), and the target direction (X) is perpendicular to the bearing surface of the substrate (101); The first receiving groove (101a) includes a plurality of first grooves (C1) spaced apart, and the color-changing structure (103) is located within the plurality of first grooves (C1); The plurality of light-emitting diodes are located outside the first receiving groove (101a) and on the first side of the substrate (101); The backlight module further includes: a first signal trace (108) and a second signal trace (109), both of which are located on the substrate (101). The light-emitting diode (102) includes a first electrode (1026) and a second electrode (1027). The light-emitting diode (102) is connected to the substrate (101) through the first electrode (1026) and the second electrode (1027). The light-emitting diode is configured to emit light toward the substrate (101). The first signal trace (108) is connected to the first electrode (1026) to provide a first signal to the first electrode (1026), the second signal trace (109) is connected to the second electrode (1027) to provide a second signal to the second electrode (1027), and the light-emitting diode (102) is used to emit light under the combined drive of the first signal and the second signal.

8. The backlight module according to claim 7, characterized in that, The ratio of the distance between the surface of the color-changing structure (103) near the first side of the substrate (101) and the surface of the first side of the substrate (101) to the depth of the first groove (C1) ranges from 1 / 5 to 3 / 5.

9. The backlight module according to claim 7, characterized in that, The depth of the first groove (C1) ranges from 20 micrometers to 50 micrometers.

10. The backlight module according to claim 7, characterized in that, The first color is blue; The color conversion structure (103) includes a plurality of sixth color conversion parts (1031f) and a plurality of seventh color conversion parts (1032f). Each of the first grooves (C1) is provided with one of the plurality of sixth color conversion parts (1031f) and the plurality of seventh color conversion parts (1032f). The color conversion material of the sixth color conversion part (1031f) is red, and the sixth color conversion part (1031f) is used to convert part of the blue light into red light. The color conversion material of the seventh color conversion part (1032f) is green, and the seventh color conversion part (1032f) is used to convert part of the blue light into green light. or, The color-converting structure (103) has multiple eighth color-converting parts (1031g), and each of the first grooves (C1) is provided with one of the multiple eighth color-converting parts (1031g). The color-converting material of the eighth color-converting part (1031g) is yellow, and the eighth color-converting part (1031g) is used to convert part of the blue light into yellow light.

11. A backlight module, characterized in that, The backlight module (10) includes: A substrate (101) has a first receiving groove (101a) on its first side. A plurality of light-emitting diodes (102) are provided for emitting light of a first color; A color conversion structure (103) is located in the first receiving groove (101a) and is used to convert a portion of the light in the first color into light of a second color, the second color being different from the first color. The light-emitting side of the plurality of light-emitting diodes (102) and the color-changing structure (103) are spaced apart in the target direction (X), and the target direction (X) is perpendicular to the bearing surface of the substrate (101); The first side of the substrate (101) also has a plurality of second receiving grooves (101b), and each of the light-emitting diodes (102) is located in one of the second receiving grooves (101b); the first receiving groove (101a) includes a plurality of second grooves (C2) arranged at intervals, and the color conversion structure (103) is located in the plurality of second grooves (C2); the backlight module further includes: a third reflective layer (116). The third reflective layer (116) is located on the second side of the substrate (101) and is used to reflect the light emitted by the light-emitting diode (102) to the first side of the substrate (101); The backlight module further includes: a first signal trace (108) and a second signal trace (109), both of which are located on the substrate (101). The light-emitting diode (102) includes a first electrode (1026) and a second electrode (1027). The light-emitting diode (102) is connected to the substrate (101) through the first electrode (1026) and the second electrode (1027). The light-emitting diode is configured to emit light toward the substrate (101). The first signal trace (108) is connected to the first electrode (1026) to provide a first signal to the first electrode (1026), the second signal trace (109) is connected to the second electrode (1027) to provide a second signal to the second electrode (1027), and the light-emitting diode (102) is used to emit light under the combined drive of the first signal and the second signal.

12. The backlight module according to claim 11, characterized in that, The backlight module further includes: an encapsulation layer (117). The encapsulation layer (117) is located on the first side of the substrate (101) and covers the plurality of second grooves (C2) and the plurality of second receiving grooves (101b).

13. The backlight module according to claim 11, characterized in that, The first color is blue; The color-changing structure (103) includes multiple ninth color-changing parts (1031g) and multiple tenth color-changing parts (1032g). Each second groove (C2) is provided with one of the multiple ninth color-changing parts (1031g) and multiple tenth color-changing parts (1032g). The color-changing material of the ninth color-changing part (1031g) is red, and the ninth color-changing part (1031g) is used to convert part of the blue light into red light. The color-changing material of the tenth color-changing part (1032g) is green, and the tenth color-changing part (1032g) is used to convert part of the blue light into green light. or, The color conversion structure (103) includes a plurality of eleventh color conversion parts (1031h), and one of the plurality of eleventh color conversion parts (1031h) is provided in each of the second grooves (C2). The color conversion material of the eleventh color conversion part (1031h) is yellow, and the eleventh color conversion part (1031h) is used to convert part of the blue light into yellow light.

14. The backlight module according to any one of claims 1 to 5 and 7 to 10, characterized in that, The backlight module also includes: a lens (111); The lens (111) is located between the plurality of light-emitting diodes (102) and the color conversion structure (103) and is used to converge the light emitted by the light-emitting diodes (102).

15. The backlight module according to any one of claims 1 to 5 and 7 to 13, characterized in that, The thickness of the substrate (101) ranges from 0.1 mm to 0.3 mm.

16. A display device, characterized in that, The display device includes: a backlight module as described in any one of claims 1 to 15, and a display module located on the light-emitting side of the backlight module; The backlight module is used to provide backlight for the display module.

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